Vendor dependencies for 0.3.0 release

vendor/winnow/examples/arithmetic/bench.rs

@@ -0,0 +1,33 @@
+mod parser;
+mod parser_ast;
+mod parser_lexer;
+
+use winnow::prelude::*;
+
+#[allow(clippy::eq_op, clippy::erasing_op)]
+fn arithmetic(c: &mut criterion::Criterion) {
+    let data = "  2*2 / ( 5 - 1) + 3 / 4 * (2 - 7 + 567 *12 /2) + 3*(1+2*( 45 /2))";
+    let expected = 2 * 2 / (5 - 1) + 3 * (1 + 2 * (45 / 2));
+
+    assert_eq!(parser::expr.parse(data), Ok(expected));
+    assert_eq!(
+        parser_ast::expr.parse(data).map(|ast| ast.eval()),
+        Ok(expected)
+    );
+    assert_eq!(
+        parser_lexer::expr2.parse(data).map(|ast| ast.eval()),
+        Ok(expected)
+    );
+    c.bench_function("direct", |b| {
+        b.iter(|| parser::expr.parse(data).unwrap());
+    });
+    c.bench_function("ast", |b| {
+        b.iter(|| parser_ast::expr.parse(data).unwrap().eval());
+    });
+    c.bench_function("lexer", |b| {
+        b.iter(|| parser_lexer::expr2.parse_peek(data).unwrap());
+    });
+}
+
+criterion::criterion_group!(benches, arithmetic);
+criterion::criterion_main!(benches);

vendor/winnow/examples/arithmetic/main.rs

@@ -0,0 +1,93 @@
+use winnow::prelude::*;
+
+mod parser;
+mod parser_ast;
+mod parser_lexer;
+#[cfg(test)]
+mod test_parser;
+#[cfg(test)]
+mod test_parser_ast;
+#[cfg(test)]
+mod test_parser_lexer;
+
+fn main() -> Result<(), lexopt::Error> {
+    let args = Args::parse()?;
+
+    let input = args.input.as_deref().unwrap_or("1 + 1");
+    if let Err(err) = calc(input, args.implementation) {
+        println!("FAILED");
+        println!("{err}");
+    }
+
+    Ok(())
+}
+
+fn calc(
+    input: &str,
+    imp: Impl,
+) -> Result<(), winnow::error::ParseError<&str, winnow::error::ContextError>> {
+    println!("{input} =");
+    match imp {
+        Impl::Eval => {
+            let result = parser::expr.parse(input)?;
+            println!("  {result}");
+        }
+        Impl::Ast => {
+            let result = parser_ast::expr.parse(input)?;
+            println!("  {:#?}={}", result, result.eval());
+        }
+        Impl::Lexer => {
+            let tokens = parser_lexer::tokens.parse(input)?;
+            println!("  {tokens:#?}");
+            let tokens = parser_lexer::Tokens::new(&tokens);
+            let result = parser_lexer::expr.parse(tokens).unwrap();
+            println!("  {:#?}={}", result, result.eval());
+        }
+    }
+    Ok(())
+}
+
+#[derive(Default)]
+struct Args {
+    input: Option<String>,
+    implementation: Impl,
+}
+
+enum Impl {
+    Eval,
+    Ast,
+    Lexer,
+}
+
+impl Default for Impl {
+    fn default() -> Self {
+        Self::Eval
+    }
+}
+
+impl Args {
+    fn parse() -> Result<Self, lexopt::Error> {
+        use lexopt::prelude::*;
+
+        let mut res = Args::default();
+
+        let mut args = lexopt::Parser::from_env();
+        while let Some(arg) = args.next()? {
+            match arg {
+                Long("impl") => {
+                    res.implementation = args.value()?.parse_with(|s| match s {
+                        "eval" => Ok(Impl::Eval),
+                        "ast" => Ok(Impl::Ast),
+                        "lexer" => Ok(Impl::Lexer),
+                        _ => Err("expected `eval`, `ast`"),
+                    })?;
+                }
+                Value(input) => {
+                    res.input = Some(input.string()?);
+                }
+                _ => return Err(arg.unexpected()),
+            }
+        }
+        Ok(res)
+    }
+}

vendor/winnow/examples/arithmetic/parser.rs

@@ -0,0 +1,68 @@
+use std::str::FromStr;
+
+use winnow::prelude::*;
+use winnow::Result;
+use winnow::{
+    ascii::{digit1 as digits, multispace0 as multispaces},
+    combinator::alt,
+    combinator::delimited,
+    combinator::repeat,
+    token::one_of,
+};
+
+// Parser definition
+
+pub(crate) fn expr(i: &mut &str) -> Result<i64> {
+    let init = term.parse_next(i)?;
+
+    repeat(0.., (one_of(['+', '-']), term))
+        .fold(
+            move || init,
+            |acc, (op, val): (char, i64)| {
+                if op == '+' {
+                    acc + val
+                } else {
+                    acc - val
+                }
+            },
+        )
+        .parse_next(i)
+}
+
+// We read an initial factor and for each time we find
+// a * or / operator followed by another factor, we do
+// the math by folding everything
+pub(crate) fn term(i: &mut &str) -> Result<i64> {
+    let init = factor.parse_next(i)?;
+
+    repeat(0.., (one_of(['*', '/']), factor))
+        .fold(
+            move || init,
+            |acc, (op, val): (char, i64)| {
+                if op == '*' {
+                    acc * val
+                } else {
+                    acc / val
+                }
+            },
+        )
+        .parse_next(i)
+}
+
+// We transform an integer string into a i64, ignoring surrounding whitespace
+// We look for a digit suite, and try to convert it.
+// If either str::from_utf8 or FromStr::from_str fail,
+// we fallback to the parens parser defined above
+pub(crate) fn factor(i: &mut &str) -> Result<i64> {
+    delimited(
+        multispaces,
+        alt((digits.try_map(FromStr::from_str), parens)),
+        multispaces,
+    )
+    .parse_next(i)
+}
+
+// We parse any expr surrounded by parens, ignoring all whitespace around those
+fn parens(i: &mut &str) -> Result<i64> {
+    delimited('(', expr, ')').parse_next(i)
+}

vendor/winnow/examples/arithmetic/parser_ast.rs

@@ -0,0 +1,100 @@
+use std::fmt;
+use std::fmt::{Debug, Display, Formatter};
+
+use std::str::FromStr;
+
+use winnow::prelude::*;
+use winnow::Result;
+use winnow::{
+    ascii::{digit1 as digits, multispace0 as multispaces},
+    combinator::alt,
+    combinator::delimited,
+    combinator::repeat,
+    token::one_of,
+};
+
+#[derive(Debug, Clone)]
+pub(crate) enum Expr {
+    Value(i64),
+    Add(Box<Expr>, Box<Expr>),
+    Sub(Box<Expr>, Box<Expr>),
+    Mul(Box<Expr>, Box<Expr>),
+    Div(Box<Expr>, Box<Expr>),
+    Paren(Box<Expr>),
+}
+
+impl Expr {
+    pub(crate) fn eval(&self) -> i64 {
+        match self {
+            Self::Value(v) => *v,
+            Self::Add(lhs, rhs) => lhs.eval() + rhs.eval(),
+            Self::Sub(lhs, rhs) => lhs.eval() - rhs.eval(),
+            Self::Mul(lhs, rhs) => lhs.eval() * rhs.eval(),
+            Self::Div(lhs, rhs) => lhs.eval() / rhs.eval(),
+            Self::Paren(expr) => expr.eval(),
+        }
+    }
+}
+
+impl Display for Expr {
+    fn fmt(&self, format: &mut Formatter<'_>) -> fmt::Result {
+        use Expr::{Add, Div, Mul, Paren, Sub, Value};
+        match *self {
+            Value(val) => write!(format, "{val}"),
+            Add(ref left, ref right) => write!(format, "{left} + {right}"),
+            Sub(ref left, ref right) => write!(format, "{left} - {right}"),
+            Mul(ref left, ref right) => write!(format, "{left} * {right}"),
+            Div(ref left, ref right) => write!(format, "{left} / {right}"),
+            Paren(ref expr) => write!(format, "({expr})"),
+        }
+    }
+}
+
+pub(crate) fn expr(i: &mut &str) -> Result<Expr> {
+    let init = term.parse_next(i)?;
+
+    repeat(0.., (one_of(['+', '-']), term))
+        .fold(
+            move || init.clone(),
+            |acc, (op, val): (char, Expr)| {
+                if op == '+' {
+                    Expr::Add(Box::new(acc), Box::new(val))
+                } else {
+                    Expr::Sub(Box::new(acc), Box::new(val))
+                }
+            },
+        )
+        .parse_next(i)
+}
+
+pub(crate) fn term(i: &mut &str) -> Result<Expr> {
+    let init = factor.parse_next(i)?;
+
+    repeat(0.., (one_of(['*', '/']), factor))
+        .fold(
+            move || init.clone(),
+            |acc, (op, val): (char, Expr)| {
+                if op == '*' {
+                    Expr::Mul(Box::new(acc), Box::new(val))
+                } else {
+                    Expr::Div(Box::new(acc), Box::new(val))
+                }
+            },
+        )
+        .parse_next(i)
+}
+
+pub(crate) fn factor(i: &mut &str) -> Result<Expr> {
+    delimited(
+        multispaces,
+        alt((digits.try_map(FromStr::from_str).map(Expr::Value), parens)),
+        multispaces,
+    )
+    .parse_next(i)
+}
+
+fn parens(i: &mut &str) -> Result<Expr> {
+    delimited("(", expr, ")")
+        .map(|e| Expr::Paren(Box::new(e)))
+        .parse_next(i)
+}

vendor/winnow/examples/arithmetic/parser_lexer.rs

@@ -0,0 +1,246 @@
+use std::fmt;
+use std::fmt::{Debug, Display, Formatter};
+
+use winnow::prelude::*;
+use winnow::Result;
+use winnow::{
+    ascii::{digit1 as digits, multispace0 as multispaces},
+    combinator::alt,
+    combinator::dispatch,
+    combinator::eof,
+    combinator::fail,
+    combinator::opt,
+    combinator::peek,
+    combinator::repeat,
+    combinator::{delimited, preceded, terminated},
+    error::ContextError,
+    stream::TokenSlice,
+    token::any,
+    token::literal,
+    token::one_of,
+    token::take_till,
+};
+
+/// Lex and parse
+#[allow(dead_code)]
+pub(crate) fn expr2(i: &mut &str) -> Result<Expr> {
+    let tokens = tokens.parse_next(i)?;
+    let mut tokens = Tokens::new(&tokens);
+    expr.parse_next(&mut tokens)
+}
+
+#[derive(Clone, PartialEq, Eq)]
+pub(crate) struct Token<'s> {
+    kind: TokenKind,
+    raw: &'s str,
+}
+
+impl fmt::Debug for Token<'_> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        // Customized for brevity for a better `winnow/debug` experience
+        match self.kind {
+            TokenKind::Value => Debug::fmt(self.raw, fmt),
+            TokenKind::Oper(oper) => Debug::fmt(&oper, fmt),
+            TokenKind::OpenParen => fmt.write_str("OpenParen"),
+            TokenKind::CloseParen => fmt.write_str("CloseParen"),
+            TokenKind::Unknown => fmt.write_str("Unknown"),
+            TokenKind::Eof => fmt.write_str("Eof"),
+        }
+    }
+}
+
+impl PartialEq<TokenKind> for Token<'_> {
+    fn eq(&self, other: &TokenKind) -> bool {
+        self.kind == *other
+    }
+}
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub(crate) enum TokenKind {
+    Value,
+    Oper(Oper),
+    OpenParen,
+    CloseParen,
+    Unknown,
+    Eof,
+}
+
+impl<'i> Parser<Tokens<'i>, &'i Token<'i>, ContextError> for TokenKind {
+    fn parse_next(&mut self, input: &mut Tokens<'i>) -> Result<&'i Token<'i>> {
+        literal(*self).parse_next(input).map(|t| &t[0])
+    }
+}
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub(crate) enum Oper {
+    Add,
+    Sub,
+    Mul,
+    Div,
+}
+
+impl winnow::stream::ContainsToken<&'_ Token<'_>> for TokenKind {
+    #[inline(always)]
+    fn contains_token(&self, token: &'_ Token<'_>) -> bool {
+        *self == token.kind
+    }
+}
+
+impl winnow::stream::ContainsToken<&'_ Token<'_>> for &'_ [TokenKind] {
+    #[inline]
+    fn contains_token(&self, token: &'_ Token<'_>) -> bool {
+        self.iter().any(|t| *t == token.kind)
+    }
+}
+
+impl<const LEN: usize> winnow::stream::ContainsToken<&'_ Token<'_>> for &'_ [TokenKind; LEN] {
+    #[inline]
+    fn contains_token(&self, token: &'_ Token<'_>) -> bool {
+        self.iter().any(|t| *t == token.kind)
+    }
+}
+
+impl<const LEN: usize> winnow::stream::ContainsToken<&'_ Token<'_>> for [TokenKind; LEN] {
+    #[inline]
+    fn contains_token(&self, token: &'_ Token<'_>) -> bool {
+        self.iter().any(|t| *t == token.kind)
+    }
+}
+
+/// Lex tokens
+///
+/// See [`expr`] to parse the tokens
+pub(crate) fn tokens<'s>(i: &mut &'s str) -> Result<Vec<Token<'s>>> {
+    let mut tokens: Vec<_> =
+        preceded(multispaces, repeat(1.., terminated(token, multispaces))).parse_next(i)?;
+    if let Some(eof) = opt(eof.map(|raw| Token {
+        kind: TokenKind::Eof,
+        raw,
+    }))
+    .parse_next(i)?
+    {
+        tokens.push(eof);
+    }
+    Ok(tokens)
+}
+
+fn token<'s>(i: &mut &'s str) -> Result<Token<'s>> {
+    dispatch! {peek(any);
+        '0'..='9' => digits.value(TokenKind::Value),
+        '(' => '('.value(TokenKind::OpenParen),
+        ')' => ')'.value(TokenKind::CloseParen),
+        '+' => '+'.value(TokenKind::Oper(Oper::Add)),
+        '-' => '-'.value(TokenKind::Oper(Oper::Sub)),
+        '*' => '*'.value(TokenKind::Oper(Oper::Mul)),
+        '/' => '/'.value(TokenKind::Oper(Oper::Div)),
+        ' '| '\t'| '\r'| '\n' => fail,
+        _ => take_till(.., ('0'..='9', '(', ')', '+', '-', '*', '/')).value(TokenKind::Unknown),
+    }
+    .with_taken()
+    .map(|(kind, raw)| Token { kind, raw })
+    .parse_next(i)
+}
+
+#[derive(Debug, Clone)]
+pub(crate) enum Expr {
+    Value(i64),
+    Add(Box<Expr>, Box<Expr>),
+    Sub(Box<Expr>, Box<Expr>),
+    Mul(Box<Expr>, Box<Expr>),
+    Div(Box<Expr>, Box<Expr>),
+    Paren(Box<Expr>),
+}
+
+impl Expr {
+    pub(crate) fn eval(&self) -> i64 {
+        match self {
+            Self::Value(v) => *v,
+            Self::Add(lhs, rhs) => lhs.eval() + rhs.eval(),
+            Self::Sub(lhs, rhs) => lhs.eval() - rhs.eval(),
+            Self::Mul(lhs, rhs) => lhs.eval() * rhs.eval(),
+            Self::Div(lhs, rhs) => lhs.eval() / rhs.eval(),
+            Self::Paren(expr) => expr.eval(),
+        }
+    }
+}
+
+impl Display for Expr {
+    fn fmt(&self, format: &mut Formatter<'_>) -> fmt::Result {
+        use Expr::{Add, Div, Mul, Paren, Sub, Value};
+        match *self {
+            Value(val) => write!(format, "{val}"),
+            Add(ref left, ref right) => write!(format, "{left} + {right}"),
+            Sub(ref left, ref right) => write!(format, "{left} - {right}"),
+            Mul(ref left, ref right) => write!(format, "{left} * {right}"),
+            Div(ref left, ref right) => write!(format, "{left} / {right}"),
+            Paren(ref expr) => write!(format, "({expr})"),
+        }
+    }
+}
+
+pub(crate) type Tokens<'i> = TokenSlice<'i, Token<'i>>;
+
+/// Parse the tokens lexed in [`tokens`]
+pub(crate) fn expr(i: &mut Tokens<'_>) -> Result<Expr> {
+    let init = term.parse_next(i)?;
+
+    let expr = repeat(
+        0..,
+        (
+            one_of([TokenKind::Oper(Oper::Add), TokenKind::Oper(Oper::Sub)]),
+            term,
+        ),
+    )
+    .fold(
+        move || init.clone(),
+        |acc, (op, val): (&Token<'_>, Expr)| {
+            if op.kind == TokenKind::Oper(Oper::Add) {
+                Expr::Add(Box::new(acc), Box::new(val))
+            } else {
+                Expr::Sub(Box::new(acc), Box::new(val))
+            }
+        },
+    )
+    .parse_next(i)?;
+
+    opt(TokenKind::Eof).parse_next(i)?;
+
+    Ok(expr)
+}
+
+pub(crate) fn term(i: &mut Tokens<'_>) -> Result<Expr> {
+    let init = factor.parse_next(i)?;
+
+    repeat(
+        0..,
+        (
+            one_of([TokenKind::Oper(Oper::Mul), TokenKind::Oper(Oper::Div)]),
+            factor,
+        ),
+    )
+    .fold(
+        move || init.clone(),
+        |acc, (op, val): (&Token<'_>, Expr)| {
+            if op.kind == TokenKind::Oper(Oper::Mul) {
+                Expr::Mul(Box::new(acc), Box::new(val))
+            } else {
+                Expr::Div(Box::new(acc), Box::new(val))
+            }
+        },
+    )
+    .parse_next(i)
+}
+
+pub(crate) fn factor(i: &mut Tokens<'_>) -> Result<Expr> {
+    alt((
+        TokenKind::Value.try_map(|t: &Token<'_>| t.raw.parse::<i64>().map(Expr::Value)),
+        parens,
+    ))
+    .parse_next(i)
+}
+
+fn parens(i: &mut Tokens<'_>) -> Result<Expr> {
+    delimited(TokenKind::OpenParen, expr, TokenKind::CloseParen)
+        .map(|e| Expr::Paren(Box::new(e)))
+        .parse_next(i)
+}

vendor/winnow/examples/arithmetic/test_parser.rs

@@ -0,0 +1,186 @@
+use snapbox::assert_data_eq;
+use snapbox::prelude::*;
+use snapbox::str;
+use winnow::prelude::*;
+
+use crate::parser::*;
+
+#[test]
+fn factor_test() {
+    let input = "3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        3,
+    ),
+)
+
+"#]];
+    assert_data_eq!(factor.parse_peek(input).to_debug(), expected);
+
+    let input = " 12";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        12,
+    ),
+)
+
+"#]];
+    assert_data_eq!(factor.parse_peek(input).to_debug(), expected);
+
+    let input = "537 ";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        537,
+    ),
+)
+
+"#]];
+    assert_data_eq!(factor.parse_peek(input).to_debug(), expected);
+
+    let input = "  24     ";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        24,
+    ),
+)
+
+"#]];
+    assert_data_eq!(factor.parse_peek(input).to_debug(), expected);
+}
+
+#[test]
+fn term_test() {
+    let input = " 12 *2 /  3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        8,
+    ),
+)
+
+"#]];
+    assert_data_eq!(term.parse_peek(input).to_debug(), expected);
+
+    let input = " 12 *2 /  3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        8,
+    ),
+)
+
+"#]];
+    assert_data_eq!(term.parse_peek(input).to_debug(), expected);
+
+    let input = " 2* 3  *2 *2 /  3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        8,
+    ),
+)
+
+"#]];
+    assert_data_eq!(term.parse_peek(input).to_debug(), expected);
+
+    let input = " 48 /  3/2";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        8,
+    ),
+)
+
+"#]];
+    assert_data_eq!(term.parse_peek(input).to_debug(), expected);
+}
+
+#[test]
+fn expr_test() {
+    let input = " 1 +  2 ";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        3,
+    ),
+)
+
+"#]];
+    assert_data_eq!(expr.parse_peek(input).to_debug(), expected);
+
+    let input = " 12 + 6 - 4+  3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        17,
+    ),
+)
+
+"#]];
+    assert_data_eq!(expr.parse_peek(input).to_debug(), expected);
+
+    let input = " 1 + 2*3 + 4";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        11,
+    ),
+)
+
+"#]];
+    assert_data_eq!(expr.parse_peek(input).to_debug(), expected);
+}
+
+#[test]
+fn parens_test() {
+    let input = " (  2 )";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        2,
+    ),
+)
+
+"#]];
+    assert_data_eq!(expr.parse_peek(input).to_debug(), expected);
+
+    let input = " 2* (  3 + 4 ) ";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        14,
+    ),
+)
+
+"#]];
+    assert_data_eq!(expr.parse_peek(input).to_debug(), expected);
+
+    let input = "  2*2 / ( 5 - 1) + 3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        4,
+    ),
+)
+
+"#]];
+    assert_data_eq!(expr.parse_peek(input).to_debug(), expected);
+}

vendor/winnow/examples/arithmetic/test_parser_ast.rs

@@ -0,0 +1,317 @@
+use snapbox::assert_data_eq;
+use snapbox::prelude::*;
+use snapbox::str;
+use winnow::prelude::*;
+
+use crate::parser_ast::*;
+
+#[test]
+fn factor_test() {
+    let input = "3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        Value(
+            3,
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(factor.parse_peek(input).to_debug(), expected);
+
+    let input = " 12";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        Value(
+            12,
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(factor.parse_peek(input).to_debug(), expected);
+
+    let input = "537 ";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        Value(
+            537,
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(factor.parse_peek(input).to_debug(), expected);
+
+    let input = "  24     ";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        Value(
+            24,
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(factor.parse_peek(input).to_debug(), expected);
+}
+
+#[test]
+fn term_test() {
+    let input = " 12 *2 /  3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        Div(
+            Mul(
+                Value(
+                    12,
+                ),
+                Value(
+                    2,
+                ),
+            ),
+            Value(
+                3,
+            ),
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(term.parse_peek(input).to_debug(), expected);
+
+    let input = " 12 *2 /  3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        Div(
+            Mul(
+                Value(
+                    12,
+                ),
+                Value(
+                    2,
+                ),
+            ),
+            Value(
+                3,
+            ),
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(term.parse_peek(input).to_debug(), expected);
+
+    let input = " 2* 3  *2 *2 /  3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        Div(
+            Mul(
+                Mul(
+                    Mul(
+                        Value(
+                            2,
+                        ),
+                        Value(
+                            3,
+                        ),
+                    ),
+                    Value(
+                        2,
+                    ),
+                ),
+                Value(
+                    2,
+                ),
+            ),
+            Value(
+                3,
+            ),
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(term.parse_peek(input).to_debug(), expected);
+
+    let input = " 48 /  3/2";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        Div(
+            Div(
+                Value(
+                    48,
+                ),
+                Value(
+                    3,
+                ),
+            ),
+            Value(
+                2,
+            ),
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(term.parse_peek(input).to_debug(), expected);
+}
+
+#[test]
+fn expr_test() {
+    let input = " 1 +  2 ";
+    let expected = str![[r#"
+Ok(
+    Add(
+        Value(
+            1,
+        ),
+        Value(
+            2,
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(expr.parse(input).to_debug(), expected);
+
+    let input = " 12 + 6 - 4+  3";
+    let expected = str![[r#"
+Ok(
+    Add(
+        Sub(
+            Add(
+                Value(
+                    12,
+                ),
+                Value(
+                    6,
+                ),
+            ),
+            Value(
+                4,
+            ),
+        ),
+        Value(
+            3,
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(expr.parse(input).to_debug(), expected);
+
+    let input = " 1 + 2*3 + 4";
+    let expected = str![[r#"
+Ok(
+    Add(
+        Add(
+            Value(
+                1,
+            ),
+            Mul(
+                Value(
+                    2,
+                ),
+                Value(
+                    3,
+                ),
+            ),
+        ),
+        Value(
+            4,
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(expr.parse(input).to_debug(), expected);
+}
+
+#[test]
+fn parens_test() {
+    let input = " (  2 )";
+    let expected = str![[r#"
+Ok(
+    Paren(
+        Value(
+            2,
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(expr.parse(input).to_debug(), expected);
+
+    let input = " 2* (  3 + 4 ) ";
+    let expected = str![[r#"
+Ok(
+    Mul(
+        Value(
+            2,
+        ),
+        Paren(
+            Add(
+                Value(
+                    3,
+                ),
+                Value(
+                    4,
+                ),
+            ),
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(expr.parse(input).to_debug(), expected);
+
+    let input = "  2*2 / ( 5 - 1) + 3";
+    let expected = str![[r#"
+Ok(
+    Add(
+        Div(
+            Mul(
+                Value(
+                    2,
+                ),
+                Value(
+                    2,
+                ),
+            ),
+            Paren(
+                Sub(
+                    Value(
+                        5,
+                    ),
+                    Value(
+                        1,
+                    ),
+                ),
+            ),
+        ),
+        Value(
+            3,
+        ),
+    ),
+)
+
+"#]];
+    assert_data_eq!(expr.parse(input).to_debug(), expected);
+}

vendor/winnow/examples/arithmetic/test_parser_lexer.rs

@@ -0,0 +1,438 @@
+use snapbox::assert_data_eq;
+use snapbox::prelude::*;
+use snapbox::str;
+use winnow::prelude::*;
+
+use crate::parser_lexer::*;
+
+#[test]
+fn lex_test() {
+    let input = "3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        [
+            "3",
+            Eof,
+        ],
+    ),
+)
+
+"#]];
+    assert_data_eq!(tokens.parse_peek(input).to_debug(), expected);
+
+    let input = "  24     ";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        [
+            "24",
+            Eof,
+        ],
+    ),
+)
+
+"#]];
+    assert_data_eq!(tokens.parse_peek(input).to_debug(), expected);
+
+    let input = " 12 *2 /  3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        [
+            "12",
+            Mul,
+            "2",
+            Div,
+            "3",
+            Eof,
+        ],
+    ),
+)
+
+"#]];
+    assert_data_eq!(tokens.parse_peek(input).to_debug(), expected);
+
+    let input = "  2*2 / ( 5 - 1) + 3";
+    let expected = str![[r#"
+Ok(
+    (
+        "",
+        [
+            "2",
+            Mul,
+            "2",
+            Div,
+            OpenParen,
+            "5",
+            Sub,
+            "1",
+            CloseParen,
+            Add,
+            "3",
+            Eof,
+        ],
+    ),
+)
+
+"#]];
+    assert_data_eq!(tokens.parse_peek(input).to_debug(), expected);
+}
+
+#[test]
+fn factor_test() {
+    let input = "3";
+    let expected = str![[r#"
+Ok(
+    (
+        [
+            Eof,
+        ],
+        Value(
+            3,
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(factor.parse_peek(input).to_debug(), expected);
+
+    let input = " 12";
+    let expected = str![[r#"
+Ok(
+    (
+        [
+            Eof,
+        ],
+        Value(
+            12,
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(factor.parse_peek(input).to_debug(), expected);
+
+    let input = "537 ";
+    let expected = str![[r#"
+Ok(
+    (
+        [
+            Eof,
+        ],
+        Value(
+            537,
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(factor.parse_peek(input).to_debug(), expected);
+
+    let input = "  24     ";
+    let expected = str![[r#"
+Ok(
+    (
+        [
+            Eof,
+        ],
+        Value(
+            24,
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(factor.parse_peek(input).to_debug(), expected);
+}
+
+#[test]
+fn term_test() {
+    let input = " 12 *2 /  3";
+    let expected = str![[r#"
+Ok(
+    (
+        [
+            Eof,
+        ],
+        Div(
+            Mul(
+                Value(
+                    12,
+                ),
+                Value(
+                    2,
+                ),
+            ),
+            Value(
+                3,
+            ),
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(term.parse_peek(input).to_debug(), expected);
+
+    let input = " 12 *2 /  3";
+    let expected = str![[r#"
+Ok(
+    (
+        [
+            Eof,
+        ],
+        Div(
+            Mul(
+                Value(
+                    12,
+                ),
+                Value(
+                    2,
+                ),
+            ),
+            Value(
+                3,
+            ),
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(term.parse_peek(input).to_debug(), expected);
+
+    let input = " 2* 3  *2 *2 /  3";
+    let expected = str![[r#"
+Ok(
+    (
+        [
+            Eof,
+        ],
+        Div(
+            Mul(
+                Mul(
+                    Mul(
+                        Value(
+                            2,
+                        ),
+                        Value(
+                            3,
+                        ),
+                    ),
+                    Value(
+                        2,
+                    ),
+                ),
+                Value(
+                    2,
+                ),
+            ),
+            Value(
+                3,
+            ),
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(term.parse_peek(input).to_debug(), expected);
+
+    let input = " 48 /  3/2";
+    let expected = str![[r#"
+Ok(
+    (
+        [
+            Eof,
+        ],
+        Div(
+            Div(
+                Value(
+                    48,
+                ),
+                Value(
+                    3,
+                ),
+            ),
+            Value(
+                2,
+            ),
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(term.parse_peek(input).to_debug(), expected);
+}
+
+#[test]
+fn expr_test() {
+    let input = " 1 +  2 ";
+    let expected = str![[r#"
+Ok(
+    Add(
+        Value(
+            1,
+        ),
+        Value(
+            2,
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(expr.parse(input).to_debug(), expected);
+
+    let input = " 12 + 6 - 4+  3";
+    let expected = str![[r#"
+Ok(
+    Add(
+        Sub(
+            Add(
+                Value(
+                    12,
+                ),
+                Value(
+                    6,
+                ),
+            ),
+            Value(
+                4,
+            ),
+        ),
+        Value(
+            3,
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(expr.parse(input).to_debug(), expected);
+
+    let input = " 1 + 2*3 + 4";
+    let expected = str![[r#"
+Ok(
+    Add(
+        Add(
+            Value(
+                1,
+            ),
+            Mul(
+                Value(
+                    2,
+                ),
+                Value(
+                    3,
+                ),
+            ),
+        ),
+        Value(
+            4,
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(expr.parse(input).to_debug(), expected);
+}
+
+#[test]
+fn parens_test() {
+    let input = " (  2 )";
+    let expected = str![[r#"
+Ok(
+    Paren(
+        Value(
+            2,
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(expr.parse(input).to_debug(), expected);
+
+    let input = " 2* (  3 + 4 ) ";
+    let expected = str![[r#"
+Ok(
+    Mul(
+        Value(
+            2,
+        ),
+        Paren(
+            Add(
+                Value(
+                    3,
+                ),
+                Value(
+                    4,
+                ),
+            ),
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(expr.parse(input).to_debug(), expected);
+
+    let input = "  2*2 / ( 5 - 1) + 3";
+    let expected = str![[r#"
+Ok(
+    Add(
+        Div(
+            Mul(
+                Value(
+                    2,
+                ),
+                Value(
+                    2,
+                ),
+            ),
+            Paren(
+                Sub(
+                    Value(
+                        5,
+                    ),
+                    Value(
+                        1,
+                    ),
+                ),
+            ),
+        ),
+        Value(
+            3,
+        ),
+    ),
+)
+
+"#]];
+    let input = tokens.parse(input).unwrap();
+    let input = Tokens::new(&input);
+    assert_data_eq!(expr.parse(input).to_debug(), expected);
+}

vendor/winnow/examples/css/main.rs

@@ -0,0 +1,62 @@
+use winnow::prelude::*;
+
+mod parser;
+
+use parser::hex_color;
+
+fn main() -> Result<(), lexopt::Error> {
+    let args = Args::parse()?;
+
+    let input = args.input.as_deref().unwrap_or("#AAAAAA");
+
+    println!("{input} =");
+    match hex_color.parse(input) {
+        Ok(result) => {
+            println!("  {result:?}");
+        }
+        Err(err) => {
+            println!("  {err}");
+        }
+    }
+
+    Ok(())
+}
+
+#[derive(Default)]
+struct Args {
+    input: Option<String>,
+}
+
+impl Args {
+    fn parse() -> Result<Self, lexopt::Error> {
+        use lexopt::prelude::*;
+
+        let mut res = Args::default();
+
+        let mut args = lexopt::Parser::from_env();
+        while let Some(arg) = args.next()? {
+            match arg {
+                Value(input) => {
+                    res.input = Some(input.string()?);
+                }
+                _ => return Err(arg.unexpected()),
+            }
+        }
+        Ok(res)
+    }
+}
+
+#[test]
+fn parse_color() {
+    assert_eq!(
+        hex_color.parse_peek("#2F14DF"),
+        Ok((
+            "",
+            parser::Color {
+                red: 47,
+                green: 20,
+                blue: 223,
+            }
+        ))
+    );
+}

vendor/winnow/examples/css/parser.rs

@@ -0,0 +1,36 @@
+use winnow::combinator::seq;
+use winnow::prelude::*;
+use winnow::token::take_while;
+use winnow::Result;
+
+#[derive(Debug, Eq, PartialEq)]
+pub(crate) struct Color {
+    pub(crate) red: u8,
+    pub(crate) green: u8,
+    pub(crate) blue: u8,
+}
+
+impl std::str::FromStr for Color {
+    // The error must be owned
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        hex_color.parse(s).map_err(|e| e.to_string())
+    }
+}
+
+pub(crate) fn hex_color(input: &mut &str) -> Result<Color> {
+    seq!(Color {
+        _: '#',
+        red: hex_primary,
+        green: hex_primary,
+        blue: hex_primary
+    })
+    .parse_next(input)
+}
+
+fn hex_primary(input: &mut &str) -> Result<u8> {
+    take_while(2, |c: char| c.is_ascii_hexdigit())
+        .try_map(|input| u8::from_str_radix(input, 16))
+        .parse_next(input)
+}

vendor/winnow/examples/custom_error.rs

@@ -0,0 +1,69 @@
+use winnow::error::AddContext;
+use winnow::error::ErrMode;
+use winnow::error::FromExternalError;
+use winnow::error::ParserError;
+use winnow::prelude::*;
+use winnow::stream::Stream;
+
+#[derive(Debug)]
+pub enum CustomError<I> {
+    MyError,
+    Winnow(I),
+    External {
+        cause: Box<dyn std::error::Error + Send + Sync + 'static>,
+        input: I,
+    },
+}
+
+impl<I: Stream + Clone> ParserError<I> for CustomError<I> {
+    type Inner = Self;
+
+    fn from_input(input: &I) -> Self {
+        CustomError::Winnow(input.clone())
+    }
+
+    fn into_inner(self) -> Result<Self::Inner, Self> {
+        Ok(self)
+    }
+}
+
+impl<C, I: Stream> AddContext<I, C> for CustomError<I> {
+    #[inline]
+    fn add_context(
+        self,
+        _input: &I,
+        _token_start: &<I as Stream>::Checkpoint,
+        _context: C,
+    ) -> Self {
+        self
+    }
+}
+
+impl<I: Stream + Clone, E: std::error::Error + Send + Sync + 'static> FromExternalError<I, E>
+    for CustomError<I>
+{
+    #[inline]
+    fn from_external_error(input: &I, e: E) -> Self {
+        CustomError::External {
+            cause: Box::new(e),
+            input: input.clone(),
+        }
+    }
+}
+
+pub fn parse<'s>(_input: &mut &'s str) -> ModalResult<&'s str, CustomError<&'s str>> {
+    Err(ErrMode::Backtrack(CustomError::MyError))
+}
+
+fn main() {}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let err = parse.parse_next(&mut "").unwrap_err();
+        assert!(matches!(err, ErrMode::Backtrack(CustomError::MyError)));
+    }
+}

vendor/winnow/examples/http/bench.rs

@@ -0,0 +1,36 @@
+mod parser;
+mod parser_streaming;
+
+fn one_test(c: &mut criterion::Criterion) {
+    let data = &b"GET / HTTP/1.1
+Host: www.reddit.com
+User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:15.0) Gecko/20100101 Firefox/15.0.1
+Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
+Accept-Language: en-us,en;q=0.5
+Accept-Encoding: gzip, deflate
+Connection: keep-alive
+
+"[..];
+
+    let mut http_group = c.benchmark_group("http");
+    http_group.throughput(criterion::Throughput::Bytes(data.len() as u64));
+    http_group.bench_with_input(
+        criterion::BenchmarkId::new("complete", data.len()),
+        data,
+        |b, data| {
+            b.iter(|| parser::parse(data).unwrap());
+        },
+    );
+    http_group.bench_with_input(
+        criterion::BenchmarkId::new("streaming", data.len()),
+        data,
+        |b, data| {
+            b.iter(|| parser_streaming::parse(data).unwrap());
+        },
+    );
+
+    http_group.finish();
+}
+
+criterion::criterion_group!(http, one_test);
+criterion::criterion_main!(http);

vendor/winnow/examples/http/main.rs

@@ -0,0 +1,47 @@
+mod parser;
+
+fn main() -> Result<(), lexopt::Error> {
+    let args = Args::parse()?;
+
+    let input = args.input.as_deref().unwrap_or(
+        "GET / HTTP/1.1
+Host: www.reddit.com
+User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:15.0) Gecko/20100101 Firefox/15.0.1
+Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
+Accept-Language: en-us,en;q=0.5
+Accept-Encoding: gzip, deflate
+Connection: keep-alive
+
+",
+    );
+
+    if let Some(result) = parser::parse(input.as_bytes()) {
+        println!("  {result:#?}");
+    }
+
+    Ok(())
+}
+
+#[derive(Default)]
+struct Args {
+    input: Option<String>,
+}
+
+impl Args {
+    fn parse() -> Result<Self, lexopt::Error> {
+        use lexopt::prelude::*;
+
+        let mut res = Args::default();
+
+        let mut args = lexopt::Parser::from_env();
+        while let Some(arg) = args.next()? {
+            match arg {
+                Value(input) => {
+                    res.input = Some(input.string()?);
+                }
+                _ => return Err(arg.unexpected()),
+            }
+        }
+        Ok(res)
+    }
+}

vendor/winnow/examples/http/parser.rs

@@ -0,0 +1,137 @@
+use winnow::combinator::seq;
+use winnow::prelude::*;
+use winnow::{ascii::line_ending, combinator::repeat, token::take_while};
+
+pub(crate) type Stream<'i> = &'i [u8];
+
+#[rustfmt::skip]
+#[derive(Debug)]
+#[allow(dead_code)]
+pub(crate) struct Request<'a> {
+  method:  &'a [u8],
+  uri:     &'a [u8],
+  version: &'a [u8],
+}
+
+#[derive(Debug)]
+#[allow(dead_code)]
+pub(crate) struct Header<'a> {
+    name: &'a [u8],
+    value: Vec<&'a [u8]>,
+}
+
+pub(crate) fn parse(data: &[u8]) -> Option<Vec<(Request<'_>, Vec<Header<'_>>)>> {
+    let mut buf = data;
+    let mut v = Vec::new();
+    loop {
+        match request(&mut buf) {
+            Ok(r) => {
+                v.push(r);
+
+                if buf.is_empty() {
+                    //println!("{}", i);
+                    break;
+                }
+            }
+            Err(e) => {
+                println!("error: {e:?}");
+                return None;
+            }
+        }
+    }
+
+    Some(v)
+}
+
+fn request<'s>(input: &mut Stream<'s>) -> ModalResult<(Request<'s>, Vec<Header<'s>>)> {
+    let req = request_line(input)?;
+    let h = repeat(1.., message_header).parse_next(input)?;
+    let _ = line_ending.parse_next(input)?;
+
+    Ok((req, h))
+}
+
+fn request_line<'s>(input: &mut Stream<'s>) -> ModalResult<Request<'s>> {
+    seq!( Request {
+        method: take_while(1.., is_token),
+        _: take_while(1.., is_space),
+        uri: take_while(1.., is_not_space),
+        _: take_while(1.., is_space),
+        version: http_version,
+        _: line_ending,
+    })
+    .parse_next(input)
+}
+
+fn http_version<'s>(input: &mut Stream<'s>) -> ModalResult<&'s [u8]> {
+    let _ = "HTTP/".parse_next(input)?;
+    let version = take_while(1.., is_version).parse_next(input)?;
+
+    Ok(version)
+}
+
+fn message_header_value<'s>(input: &mut Stream<'s>) -> ModalResult<&'s [u8]> {
+    let _ = take_while(1.., is_horizontal_space).parse_next(input)?;
+    let data = take_while(1.., till_line_ending).parse_next(input)?;
+    let _ = line_ending.parse_next(input)?;
+
+    Ok(data)
+}
+
+fn message_header<'s>(input: &mut Stream<'s>) -> ModalResult<Header<'s>> {
+    seq!(Header {
+        name: take_while(1.., is_token),
+        _: ':',
+        value: repeat(1.., message_header_value),
+    })
+    .parse_next(input)
+}
+
+#[rustfmt::skip]
+#[allow(clippy::match_same_arms)]
+#[allow(clippy::match_like_matches_macro)]
+fn is_token(c: u8) -> bool {
+  match c {
+    128..=255 => false,
+    0..=31    => false,
+    b'('      => false,
+    b')'      => false,
+    b'<'      => false,
+    b'>'      => false,
+    b'@'      => false,
+    b','      => false,
+    b';'      => false,
+    b':'      => false,
+    b'\\'     => false,
+    b'"'      => false,
+    b'/'      => false,
+    b'['      => false,
+    b']'      => false,
+    b'?'      => false,
+    b'='      => false,
+    b'{'      => false,
+    b'}'      => false,
+    b' '      => false,
+    _         => true,
+  }
+}
+
+fn is_version(c: u8) -> bool {
+    c.is_ascii_digit() || c == b'.'
+}
+
+fn till_line_ending(c: u8) -> bool {
+    c != b'\r' && c != b'\n'
+}
+
+fn is_space(c: u8) -> bool {
+    c == b' '
+}
+
+fn is_not_space(c: u8) -> bool {
+    c != b' '
+}
+
+fn is_horizontal_space(c: u8) -> bool {
+    c == b' ' || c == b'\t'
+}

vendor/winnow/examples/http/parser_streaming.rs

@@ -0,0 +1,138 @@
+use winnow::combinator::seq;
+use winnow::{
+    ascii::line_ending, combinator::repeat, prelude::*, stream::Partial, token::take_while,
+};
+
+pub(crate) type Stream<'i> = Partial<&'i [u8]>;
+
+#[rustfmt::skip]
+#[derive(Debug)]
+#[allow(dead_code)]
+pub(crate) struct Request<'a> {
+  method:  &'a [u8],
+  uri:     &'a [u8],
+  version: &'a [u8],
+}
+
+#[derive(Debug)]
+#[allow(dead_code)]
+pub(crate) struct Header<'a> {
+    name: &'a [u8],
+    value: Vec<&'a [u8]>,
+}
+
+pub(crate) fn parse(data: &[u8]) -> Option<Vec<(Request<'_>, Vec<Header<'_>>)>> {
+    let mut buf = Partial::new(data);
+    let mut v = Vec::new();
+    loop {
+        match request(&mut buf) {
+            Ok(r) => {
+                v.push(r);
+
+                if buf.is_empty() {
+                    //println!("{}", i);
+                    break;
+                }
+            }
+            Err(e) => {
+                println!("error: {e:?}");
+                return None;
+            }
+        }
+    }
+
+    Some(v)
+}
+
+fn request<'s>(input: &mut Stream<'s>) -> ModalResult<(Request<'s>, Vec<Header<'s>>)> {
+    let req = request_line(input)?;
+    let h = repeat(1.., message_header).parse_next(input)?;
+    let _ = line_ending.parse_next(input)?;
+
+    Ok((req, h))
+}
+
+fn request_line<'s>(input: &mut Stream<'s>) -> ModalResult<Request<'s>> {
+    seq!( Request {
+        method: take_while(1.., is_token),
+        _: take_while(1.., is_space),
+        uri: take_while(1.., is_not_space),
+        _: take_while(1.., is_space),
+        version: http_version,
+        _: line_ending,
+    })
+    .parse_next(input)
+}
+
+fn http_version<'s>(input: &mut Stream<'s>) -> ModalResult<&'s [u8]> {
+    let _ = "HTTP/".parse_next(input)?;
+    let version = take_while(1.., is_version).parse_next(input)?;
+
+    Ok(version)
+}
+
+fn message_header_value<'s>(input: &mut Stream<'s>) -> ModalResult<&'s [u8]> {
+    let _ = take_while(1.., is_horizontal_space).parse_next(input)?;
+    let data = take_while(1.., till_line_ending).parse_next(input)?;
+    let _ = line_ending.parse_next(input)?;
+
+    Ok(data)
+}
+
+fn message_header<'s>(input: &mut Stream<'s>) -> ModalResult<Header<'s>> {
+    seq!(Header {
+        name: take_while(1.., is_token),
+        _: ':',
+        value: repeat(1.., message_header_value),
+    })
+    .parse_next(input)
+}
+
+#[rustfmt::skip]
+#[allow(clippy::match_same_arms)]
+#[allow(clippy::match_like_matches_macro)]
+fn is_token(c: u8) -> bool {
+  match c {
+    128..=255 => false,
+    0..=31    => false,
+    b'('      => false,
+    b')'      => false,
+    b'<'      => false,
+    b'>'      => false,
+    b'@'      => false,
+    b','      => false,
+    b';'      => false,
+    b':'      => false,
+    b'\\'     => false,
+    b'"'      => false,
+    b'/'      => false,
+    b'['      => false,
+    b']'      => false,
+    b'?'      => false,
+    b'='      => false,
+    b'{'      => false,
+    b'}'      => false,
+    b' '      => false,
+    _         => true,
+  }
+}
+
+fn is_version(c: u8) -> bool {
+    c.is_ascii_digit() || c == b'.'
+}
+
+fn till_line_ending(c: u8) -> bool {
+    c != b'\r' && c != b'\n'
+}
+
+fn is_space(c: u8) -> bool {
+    c == b' '
+}
+
+fn is_not_space(c: u8) -> bool {
+    c != b' '
+}
+
+fn is_horizontal_space(c: u8) -> bool {
+    c == b' ' || c == b'\t'
+}

vendor/winnow/examples/ini/bench.rs

@@ -0,0 +1,62 @@
+use winnow::combinator::repeat;
+use winnow::prelude::*;
+use winnow::Result;
+
+mod parser;
+mod parser_str;
+
+fn bench_ini(c: &mut criterion::Criterion) {
+    let str = "[owner]
+name=John Doe
+organization=Acme Widgets Inc.
+
+[database]
+server=192.0.2.62
+port=143
+file=payroll.dat
+\0";
+
+    let mut group = c.benchmark_group("ini");
+    group.throughput(criterion::Throughput::Bytes(str.len() as u64));
+    group.bench_function(criterion::BenchmarkId::new("bytes", str.len()), |b| {
+        b.iter(|| parser::categories.parse_peek(str.as_bytes()).unwrap());
+    });
+    group.bench_function(criterion::BenchmarkId::new("str", str.len()), |b| {
+        b.iter(|| parser_str::categories.parse_peek(str).unwrap());
+    });
+}
+
+fn bench_ini_keys_and_values(c: &mut criterion::Criterion) {
+    let str = "server=192.0.2.62
+port=143
+file=payroll.dat
+\0";
+
+    fn acc<'s>(i: &mut parser::Stream<'s>) -> Result<Vec<(&'s str, &'s str)>> {
+        repeat(0.., parser::key_value).parse_next(i)
+    }
+
+    let mut group = c.benchmark_group("ini keys and values");
+    group.throughput(criterion::Throughput::Bytes(str.len() as u64));
+    group.bench_function(criterion::BenchmarkId::new("bytes", str.len()), |b| {
+        b.iter(|| acc.parse_peek(str.as_bytes()).unwrap());
+    });
+}
+
+fn bench_ini_key_value(c: &mut criterion::Criterion) {
+    let str = "server=192.0.2.62\n";
+
+    let mut group = c.benchmark_group("ini key value");
+    group.throughput(criterion::Throughput::Bytes(str.len() as u64));
+    group.bench_function(criterion::BenchmarkId::new("bytes", str.len()), |b| {
+        b.iter(|| parser::key_value.parse_peek(str.as_bytes()).unwrap());
+    });
+}
+
+criterion::criterion_group!(
+    benches,
+    bench_ini,
+    bench_ini_keys_and_values,
+    bench_ini_key_value
+);
+criterion::criterion_main!(benches);

vendor/winnow/examples/ini/main.rs

@@ -0,0 +1,60 @@
+use winnow::prelude::*;
+
+mod parser;
+mod parser_str;
+
+fn main() -> Result<(), lexopt::Error> {
+    let args = Args::parse()?;
+
+    let input = args.input.as_deref().unwrap_or("1 + 1");
+
+    if args.binary {
+        match parser::categories.parse(input.as_bytes()) {
+            Ok(result) => {
+                println!("  {result:?}");
+            }
+            Err(err) => {
+                println!("  {err:?}");
+            }
+        }
+    } else {
+        match parser_str::categories.parse(input) {
+            Ok(result) => {
+                println!("  {result:?}");
+            }
+            Err(err) => {
+                println!("  {err}");
+            }
+        }
+    }
+
+    Ok(())
+}
+
+#[derive(Default)]
+struct Args {
+    input: Option<String>,
+    binary: bool,
+}
+
+impl Args {
+    fn parse() -> Result<Self, lexopt::Error> {
+        use lexopt::prelude::*;
+
+        let mut res = Args::default();
+
+        let mut args = lexopt::Parser::from_env();
+        while let Some(arg) = args.next()? {
+            match arg {
+                Long("binary") => {
+                    res.binary = true;
+                }
+                Value(input) => {
+                    res.input = Some(input.string()?);
+                }
+                _ => return Err(arg.unexpected()),
+            }
+        }
+        Ok(res)
+    }
+}

vendor/winnow/examples/ini/parser.rs

@@ -0,0 +1,149 @@
+use std::collections::HashMap;
+use std::str;
+
+use winnow::prelude::*;
+use winnow::Result;
+use winnow::{
+    ascii::{alphanumeric1 as alphanumeric, multispace0 as multispace, space0 as space},
+    combinator::opt,
+    combinator::repeat,
+    combinator::{delimited, separated_pair, terminated},
+    token::take_while,
+};
+
+pub(crate) type Stream<'i> = &'i [u8];
+
+pub(crate) fn categories<'s>(
+    i: &mut Stream<'s>,
+) -> Result<HashMap<&'s str, HashMap<&'s str, &'s str>>> {
+    repeat(
+        0..,
+        separated_pair(
+            category,
+            opt(multispace),
+            repeat(0.., terminated(key_value, opt(multispace))),
+        ),
+    )
+    .parse_next(i)
+}
+
+fn category<'s>(i: &mut Stream<'s>) -> Result<&'s str> {
+    delimited('[', take_while(0.., |c| c != b']'), ']')
+        .try_map(str::from_utf8)
+        .parse_next(i)
+}
+
+pub(crate) fn key_value<'s>(i: &mut Stream<'s>) -> Result<(&'s str, &'s str)> {
+    let key = alphanumeric.try_map(str::from_utf8).parse_next(i)?;
+    let _ = (opt(space), '=', opt(space)).parse_next(i)?;
+    let val = take_while(0.., |c| c != b'\n' && c != b';')
+        .try_map(str::from_utf8)
+        .parse_next(i)?;
+    let _ = opt((';', take_while(0.., |c| c != b'\n'))).parse_next(i)?;
+    Ok((key, val))
+}
+
+#[test]
+fn parse_category_test() {
+    let ini_file = &b"[category]
+
+parameter=value
+key = value2"[..];
+
+    let ini_without_category = &b"\n\nparameter=value
+key = value2"[..];
+
+    let res = category.parse_peek(ini_file);
+    println!("{res:?}");
+    match res {
+        Ok((i, o)) => println!("i: {:?} | o: {:?}", str::from_utf8(i), o),
+        _ => println!("error"),
+    }
+
+    assert_eq!(res, Ok((ini_without_category, "category")));
+}
+
+#[test]
+fn parse_key_value_test() {
+    let ini_file = &b"parameter=value
+key = value2"[..];
+
+    let ini_without_key_value = &b"\nkey = value2"[..];
+
+    let res = key_value.parse_peek(ini_file);
+    println!("{res:?}");
+    match res {
+        Ok((i, (o1, o2))) => println!("i: {:?} | o: ({:?},{:?})", str::from_utf8(i), o1, o2),
+        _ => println!("error"),
+    }
+
+    assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
+}
+
+#[test]
+fn parse_key_value_with_space_test() {
+    let ini_file = &b"parameter = value
+key = value2"[..];
+
+    let ini_without_key_value = &b"\nkey = value2"[..];
+
+    let res = key_value.parse_peek(ini_file);
+    println!("{res:?}");
+    match res {
+        Ok((i, (o1, o2))) => println!("i: {:?} | o: ({:?},{:?})", str::from_utf8(i), o1, o2),
+        _ => println!("error"),
+    }
+
+    assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
+}
+
+#[test]
+fn parse_key_value_with_comment_test() {
+    let ini_file = &b"parameter=value;abc
+key = value2"[..];
+
+    let ini_without_key_value = &b"\nkey = value2"[..];
+
+    let res = key_value.parse_peek(ini_file);
+    println!("{res:?}");
+    match res {
+        Ok((i, (o1, o2))) => println!("i: {:?} | o: ({:?},{:?})", str::from_utf8(i), o1, o2),
+        _ => println!("error"),
+    }
+
+    assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
+}
+
+#[test]
+fn parse_multiple_categories_test() {
+    let ini_file = &b"[abcd]
+
+parameter=value;abc
+
+key = value2
+
+[category]
+parameter3=value3
+key4 = value4
+"[..];
+
+    let ini_after_parser = &b""[..];
+
+    let res = categories.parse_peek(ini_file);
+    //println!("{:?}", res);
+    match res {
+        Ok((i, ref o)) => println!("i: {:?} | o: {:?}", str::from_utf8(i), o),
+        _ => println!("error"),
+    }
+
+    let mut expected_1: HashMap<&str, &str> = HashMap::new();
+    expected_1.insert("parameter", "value");
+    expected_1.insert("key", "value2");
+    let mut expected_2: HashMap<&str, &str> = HashMap::new();
+    expected_2.insert("parameter3", "value3");
+    expected_2.insert("key4", "value4");
+    let mut expected_h: HashMap<&str, HashMap<&str, &str>> = HashMap::new();
+    expected_h.insert("abcd", expected_1);
+    expected_h.insert("category", expected_2);
+    assert_eq!(res, Ok((ini_after_parser, expected_h)));
+}

vendor/winnow/examples/ini/parser_str.rs

@@ -0,0 +1,209 @@
+use std::collections::HashMap;
+
+use winnow::prelude::*;
+use winnow::Result;
+use winnow::{
+    ascii::{alphanumeric1 as alphanumeric, space0 as space},
+    combinator::opt,
+    combinator::repeat,
+    combinator::{delimited, terminated},
+    token::{take_till, take_while},
+};
+
+pub(crate) type Stream<'i> = &'i str;
+
+pub(crate) fn categories<'s>(
+    input: &mut Stream<'s>,
+) -> Result<HashMap<&'s str, HashMap<&'s str, &'s str>>> {
+    repeat(0.., category_and_keys).parse_next(input)
+}
+
+fn category_and_keys<'s>(i: &mut Stream<'s>) -> Result<(&'s str, HashMap<&'s str, &'s str>)> {
+    (category, keys_and_values).parse_next(i)
+}
+
+fn category<'s>(i: &mut Stream<'s>) -> Result<&'s str> {
+    terminated(
+        delimited('[', take_while(0.., |c| c != ']'), ']'),
+        opt(take_while(1.., [' ', '\r', '\n'])),
+    )
+    .parse_next(i)
+}
+
+fn keys_and_values<'s>(input: &mut Stream<'s>) -> Result<HashMap<&'s str, &'s str>> {
+    repeat(0.., key_value).parse_next(input)
+}
+
+fn key_value<'s>(i: &mut Stream<'s>) -> Result<(&'s str, &'s str)> {
+    let key = alphanumeric.parse_next(i)?;
+    let _ = (opt(space), "=", opt(space)).parse_next(i)?;
+    let val = take_till(0.., is_line_ending_or_comment).parse_next(i)?;
+    let _ = opt(space).parse_next(i)?;
+    let _ = opt((";", till_line_ending)).parse_next(i)?;
+    let _ = opt(space_or_line_ending).parse_next(i)?;
+
+    Ok((key, val))
+}
+
+fn is_line_ending_or_comment(chr: char) -> bool {
+    chr == ';' || chr == '\n'
+}
+
+fn till_line_ending<'s>(i: &mut Stream<'s>) -> Result<&'s str> {
+    take_while(0.., |c| c != '\r' && c != '\n').parse_next(i)
+}
+
+fn space_or_line_ending<'s>(i: &mut Stream<'s>) -> Result<&'s str> {
+    take_while(1.., [' ', '\r', '\n']).parse_next(i)
+}
+
+#[test]
+fn parse_category_test() {
+    let ini_file = "[category]
+
+parameter=value
+key = value2";
+
+    let ini_without_category = "parameter=value
+key = value2";
+
+    let res = category.parse_peek(ini_file);
+    println!("{res:?}");
+    match res {
+        Ok((i, o)) => println!("i: {i} | o: {o:?}"),
+        _ => println!("error"),
+    }
+
+    assert_eq!(res, Ok((ini_without_category, "category")));
+}
+
+#[test]
+fn parse_key_value_test() {
+    let ini_file = "parameter=value
+key = value2";
+
+    let ini_without_key_value = "key = value2";
+
+    let res = key_value.parse_peek(ini_file);
+    println!("{res:?}");
+    match res {
+        Ok((i, (o1, o2))) => println!("i: {i} | o: ({o1:?},{o2:?})"),
+        _ => println!("error"),
+    }
+
+    assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
+}
+
+#[test]
+fn parse_key_value_with_space_test() {
+    let ini_file = "parameter = value
+key = value2";
+
+    let ini_without_key_value = "key = value2";
+
+    let res = key_value.parse_peek(ini_file);
+    println!("{res:?}");
+    match res {
+        Ok((i, (o1, o2))) => println!("i: {i} | o: ({o1:?},{o2:?})"),
+        _ => println!("error"),
+    }
+
+    assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
+}
+
+#[test]
+fn parse_key_value_with_comment_test() {
+    let ini_file = "parameter=value;abc
+key = value2";
+
+    let ini_without_key_value = "key = value2";
+
+    let res = key_value.parse_peek(ini_file);
+    println!("{res:?}");
+    match res {
+        Ok((i, (o1, o2))) => println!("i: {i} | o: ({o1:?},{o2:?})"),
+        _ => println!("error"),
+    }
+
+    assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
+}
+
+#[test]
+fn parse_multiple_keys_and_values_test() {
+    let ini_file = "parameter=value;abc
+
+key = value2
+
+[category]";
+
+    let ini_without_key_value = "[category]";
+
+    let res = keys_and_values.parse_peek(ini_file);
+    println!("{res:?}");
+    match res {
+        Ok((i, ref o)) => println!("i: {i} | o: {o:?}"),
+        _ => println!("error"),
+    }
+
+    let mut expected: HashMap<&str, &str> = HashMap::new();
+    expected.insert("parameter", "value");
+    expected.insert("key", "value2");
+    assert_eq!(res, Ok((ini_without_key_value, expected)));
+}
+
+#[test]
+fn parse_category_then_multiple_keys_and_values_test() {
+    //FIXME: there can be an empty line or a comment line after a category
+    let ini_file = "[abcd]
+parameter=value;abc
+
+key = value2
+
+[category]";
+
+    let ini_after_parser = "[category]";
+
+    let res = category_and_keys.parse_peek(ini_file);
+    println!("{res:?}");
+    match res {
+        Ok((i, ref o)) => println!("i: {i} | o: {o:?}"),
+        _ => println!("error"),
+    }
+
+    let mut expected_h: HashMap<&str, &str> = HashMap::new();
+    expected_h.insert("parameter", "value");
+    expected_h.insert("key", "value2");
+    assert_eq!(res, Ok((ini_after_parser, ("abcd", expected_h))));
+}
+
+#[test]
+fn parse_multiple_categories_test() {
+    let ini_file = "[abcd]
+
+parameter=value;abc
+
+key = value2
+
+[category]
+parameter3=value3
+key4 = value4
+";
+
+    let res = categories.parse_peek(ini_file);
+    //println!("{:?}", res);
+    match res {
+        Ok((i, ref o)) => println!("i: {i} | o: {o:?}"),
+        _ => println!("error"),
+    }
+
+    let mut expected_1: HashMap<&str, &str> = HashMap::new();
+    expected_1.insert("parameter", "value");
+    expected_1.insert("key", "value2");
+    let mut expected_2: HashMap<&str, &str> = HashMap::new();
+    expected_2.insert("parameter3", "value3");
+    expected_2.insert("key4", "value4");
+    let mut expected_h: HashMap<&str, HashMap<&str, &str>> = HashMap::new();
+    expected_h.insert("abcd", expected_1);
+    expected_h.insert("category", expected_2);
+    assert_eq!(res, Ok(("", expected_h)));
+}

vendor/winnow/examples/iterator.rs

@@ -0,0 +1,65 @@
+use std::collections::HashMap;
+use std::iter::Iterator;
+
+use winnow::ascii::alphanumeric1;
+use winnow::combinator::iterator;
+use winnow::combinator::{separated_pair, terminated};
+use winnow::prelude::*;
+
+fn main() {
+    let mut data = "abcabcabcabc";
+
+    fn parser<'s>(i: &mut &'s str) -> ModalResult<&'s str> {
+        "abc".parse_next(i)
+    }
+
+    // `from_fn` (available from Rust 1.34) can create an iterator
+    // from a closure
+    let it = std::iter::from_fn(move || parser.parse_next(&mut data).ok());
+
+    for value in it {
+        println!("parser returned: {value}");
+    }
+
+    println!("\n********************\n");
+
+    let mut data = "abcabcabcabc";
+
+    // if `from_fn` is not available, it is possible to fold
+    // over an iterator of functions
+    let res = std::iter::repeat(parser)
+        .take(3)
+        .try_fold(Vec::new(), |mut acc, mut parser| {
+            parser.parse_next(&mut data).map(|o| {
+                acc.push(o);
+                acc
+            })
+        });
+
+    // will print "parser iterator returned: Ok(("abc", ["abc", "abc", "abc"]))"
+    println!("\nparser iterator returned: {res:?}");
+
+    println!("\n********************\n");
+
+    let data = "key1:value1,key2:value2,key3:value3,;";
+
+    // `winnow::combinator::iterator` will return an iterator
+    // producing the parsed values. Compared to the previous
+    // solutions:
+    // - we can work with a normal iterator like `from_fn`
+    // - we can get the remaining input afterwards, like with the `try_fold` trick
+    let mut winnow_it = iterator(
+        data,
+        terminated(separated_pair(alphanumeric1, ":", alphanumeric1), ","),
+    );
+
+    let res = winnow_it
+        .map(|(k, v)| (k.to_uppercase(), v))
+        .collect::<HashMap<_, _>>();
+
+    let parser_result: ModalResult<(_, _), ()> = winnow_it.finish();
+    let (remaining_input, ()) = parser_result.unwrap();
+
+    // will print "iterator returned {"key1": "value1", "key3": "value3", "key2": "value2"}, remaining input is ';'"
+    println!("iterator returned {res:?}, remaining input is '{remaining_input}'");
+}

vendor/winnow/examples/json/bench.rs

@@ -0,0 +1,78 @@
+use winnow::prelude::*;
+use winnow::Partial;
+
+mod json;
+mod parser_alt;
+mod parser_dispatch;
+mod parser_partial;
+
+fn json_bench(c: &mut criterion::Criterion) {
+    let data = [("small", SMALL), ("canada", CANADA)];
+    let mut group = c.benchmark_group("json");
+    for (name, sample) in data {
+        let len = sample.len();
+        group.throughput(criterion::Throughput::Bytes(len as u64));
+
+        group.bench_with_input(
+            criterion::BenchmarkId::new("dispatch", name),
+            &len,
+            |b, _| {
+                type Error = winnow::error::ErrMode<winnow::error::ContextError>;
+
+                b.iter(|| parser_dispatch::json::<Error>.parse_peek(sample).unwrap());
+            },
+        );
+        group.bench_with_input(
+            criterion::BenchmarkId::new("modeless", name),
+            &len,
+            |b, _| {
+                type Error = winnow::error::ContextError;
+
+                b.iter(|| parser_dispatch::json::<Error>.parse_peek(sample).unwrap());
+            },
+        );
+        group.bench_with_input(
+            criterion::BenchmarkId::new("empty-error", name),
+            &len,
+            |b, _| {
+                type Error<'i> = winnow::error::EmptyError;
+
+                b.iter(|| {
+                    parser_dispatch::json::<Error<'_>>
+                        .parse_peek(sample)
+                        .unwrap()
+                });
+            },
+        );
+        group.bench_with_input(criterion::BenchmarkId::new("alt", name), &len, |b, _| {
+            type Error = winnow::error::ContextError;
+
+            b.iter(|| parser_alt::json::<Error>.parse_peek(sample).unwrap());
+        });
+        group.bench_with_input(
+            criterion::BenchmarkId::new("streaming", name),
+            &len,
+            |b, _| {
+                type Error = winnow::error::ContextError;
+
+                b.iter(|| {
+                    parser_partial::json::<Error>
+                        .parse_peek(Partial::new(sample))
+                        .unwrap()
+                });
+            },
+        );
+    }
+    group.finish();
+}
+
+const SMALL: &str = "  { \"a\"\t: 42,
+  \"b\": [ \"x\", \"y\", 12 ,\"\\u2014\", \"\\uD83D\\uDE10\"] ,
+  \"c\": { \"hello\" : \"world\"
+  }
+  }  ";
+
+const CANADA: &str = include_str!("../../third_party/nativejson-benchmark/data/canada.json");
+
+criterion::criterion_group!(benches, json_bench,);
+criterion::criterion_main!(benches);

vendor/winnow/examples/json/json.rs

@@ -0,0 +1,11 @@
+use std::collections::HashMap;
+
+#[derive(Debug, PartialEq, Clone)]
+pub(crate) enum JsonValue {
+    Null,
+    Boolean(bool),
+    Str(String),
+    Num(f64),
+    Array(Vec<JsonValue>),
+    Object(HashMap<String, JsonValue>),
+}

vendor/winnow/examples/json/main.rs

@@ -0,0 +1,98 @@
+mod json;
+mod parser_alt;
+mod parser_dispatch;
+#[allow(dead_code)]
+mod parser_partial;
+
+use winnow::error::EmptyError;
+use winnow::prelude::*;
+
+fn main() -> Result<(), lexopt::Error> {
+    let args = Args::parse()?;
+
+    let data = args.input.as_deref().unwrap_or(if args.invalid {
+        "  { \"a\"\t: 42,
+  \"b\": [ \"x\", \"y\", 12 ] ,
+  \"c\": { 1\"hello\" : \"world\"
+  }
+  } "
+    } else {
+        "  { \"a\"\t: 42,
+  \"b\": [ \"x\", \"y\", 12 ] ,
+  \"c\": { \"hello\" : \"world\"
+  }
+  } "
+    });
+
+    let result = match args.implementation {
+        Impl::Naive => parser_alt::json::<EmptyError>.parse(data),
+        Impl::Dispatch => parser_dispatch::json::<EmptyError>.parse(data),
+    };
+    match result {
+        Ok(json) => {
+            println!("{json:#?}");
+        }
+        Err(err) => {
+            if args.pretty {
+                println!("{err}");
+            } else {
+                println!("{err:#?}");
+            }
+        }
+    }
+
+    Ok(())
+}
+
+#[derive(Default)]
+struct Args {
+    input: Option<String>,
+    invalid: bool,
+    pretty: bool,
+    implementation: Impl,
+}
+
+enum Impl {
+    Naive,
+    Dispatch,
+}
+
+impl Default for Impl {
+    fn default() -> Self {
+        Self::Naive
+    }
+}
+
+impl Args {
+    fn parse() -> Result<Self, lexopt::Error> {
+        use lexopt::prelude::*;
+
+        let mut res = Args::default();
+
+        let mut args = lexopt::Parser::from_env();
+        while let Some(arg) = args.next()? {
+            match arg {
+                Long("invalid") => {
+                    res.invalid = true;
+                }
+                Long("pretty") => {
+                    // Only case where pretty matters
+                    res.pretty = true;
+                    res.invalid = true;
+                }
+                Long("impl") => {
+                    res.implementation = args.value()?.parse_with(|s| match s {
+                        "naive" => Ok(Impl::Naive),
+                        "dispatch" => Ok(Impl::Dispatch),
+                        _ => Err("expected `naive`, `dispatch`"),
+                    })?;
+                }
+                Value(input) => {
+                    res.input = Some(input.string()?);
+                }
+                _ => return Err(arg.unexpected()),
+            }
+        }
+        Ok(res)
+    }
+}

vendor/winnow/examples/json/parser_alt.rs

@@ -0,0 +1,323 @@
+use std::collections::HashMap;
+use std::str;
+
+use winnow::prelude::*;
+use winnow::{
+    ascii::float,
+    combinator::alt,
+    combinator::cut_err,
+    combinator::{delimited, preceded, separated_pair, terminated},
+    combinator::{repeat, separated},
+    error::{AddContext, ParserError, StrContext},
+    token::{any, none_of, take, take_while},
+};
+
+use crate::json::JsonValue;
+
+pub(crate) type Stream<'i> = &'i str;
+
+/// The root element of a JSON parser is any value
+///
+/// A parser has the following signature:
+/// `&mut Stream -> ModalResult<Output, ContextError>`, with `ModalResult` defined as:
+/// `type ModalResult<O, E = (I, ErrorKind)> = Result<O, Err<E>>;`
+///
+/// most of the times you can ignore the error type and use the default (but this
+/// examples shows custom error types later on!)
+///
+/// Here we use `&str` as input type, but parsers can be generic over
+/// the input type, work directly with `&[u8]`, or any other type that
+/// implements the required traits.
+pub(crate) fn json<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<JsonValue, E> {
+    delimited(ws, json_value, ws).parse_next(input)
+}
+
+/// `alt` is a combinator that tries multiple parsers one by one, until
+/// one of them succeeds
+fn json_value<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<JsonValue, E> {
+    // `alt` combines the each value parser. It returns the result of the first
+    // successful parser, or an error
+    alt((
+        null.value(JsonValue::Null),
+        boolean.map(JsonValue::Boolean),
+        string.map(JsonValue::Str),
+        float.map(JsonValue::Num),
+        array.map(JsonValue::Array),
+        object.map(JsonValue::Object),
+    ))
+    .parse_next(input)
+}
+
+/// `literal(string)` generates a parser that takes the argument string.
+///
+/// This also shows returning a sub-slice of the original input
+fn null<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<&'i str, E> {
+    // This is a parser that returns `"null"` if it sees the string "null", and
+    // an error otherwise
+    "null".parse_next(input)
+}
+
+/// We can combine `tag` with other functions, like `value` which returns a given constant value on
+/// success.
+fn boolean<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<bool, E> {
+    // This is a parser that returns `true` if it sees the string "true", and
+    // an error otherwise
+    let parse_true = "true".value(true);
+
+    // This is a parser that returns `false` if it sees the string "false", and
+    // an error otherwise
+    let parse_false = "false".value(false);
+
+    alt((parse_true, parse_false)).parse_next(input)
+}
+
+/// This parser gathers all `char`s up into a `String`with a parse to take the double quote
+/// character, before the string (using `preceded`) and after the string (using `terminated`).
+fn string<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<String, E> {
+    preceded(
+        '\"',
+        // `cut_err` transforms an `ErrMode::Backtrack(e)` to `ErrMode::Cut(e)`, signaling to
+        // combinators like  `alt` that they should not try other parsers. We were in the
+        // right branch (since we found the `"` character) but encountered an error when
+        // parsing the string
+        cut_err(terminated(
+            repeat(0.., character).fold(String::new, |mut string, c| {
+                string.push(c);
+                string
+            }),
+            '\"',
+        )),
+    )
+    // `context` lets you add a static string to errors to provide more information in the
+    // error chain (to indicate which parser had an error)
+    .context(StrContext::Expected("string".into()))
+    .parse_next(input)
+}
+
+/// You can mix the above declarative parsing with an imperative style to handle more unique cases,
+/// like escaping
+fn character<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<char, E> {
+    let c = none_of('\"').parse_next(input)?;
+    if c == '\\' {
+        alt((
+            any.verify_map(|c| {
+                Some(match c {
+                    '"' | '\\' | '/' => c,
+                    'b' => '\x08',
+                    'f' => '\x0C',
+                    'n' => '\n',
+                    'r' => '\r',
+                    't' => '\t',
+                    _ => return None,
+                })
+            }),
+            preceded('u', unicode_escape),
+        ))
+        .parse_next(input)
+    } else {
+        Ok(c)
+    }
+}
+
+fn unicode_escape<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<char, E> {
+    alt((
+        // Not a surrogate
+        u16_hex
+            .verify(|cp| !(0xD800..0xE000).contains(cp))
+            .map(|cp| cp as u32),
+        // See https://en.wikipedia.org/wiki/UTF-16#Code_points_from_U+010000_to_U+10FFFF for details
+        separated_pair(u16_hex, "\\u", u16_hex)
+            .verify(|(high, low)| (0xD800..0xDC00).contains(high) && (0xDC00..0xE000).contains(low))
+            .map(|(high, low)| {
+                let high_ten = (high as u32) - 0xD800;
+                let low_ten = (low as u32) - 0xDC00;
+                (high_ten << 10) + low_ten + 0x10000
+            }),
+    ))
+    .verify_map(
+        // Could be probably replaced with .unwrap() or _unchecked due to the verify checks
+        std::char::from_u32,
+    )
+    .parse_next(input)
+}
+
+fn u16_hex<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<u16, E> {
+    take(4usize)
+        .verify_map(|s| u16::from_str_radix(s, 16).ok())
+        .parse_next(input)
+}
+
+/// Some combinators, like `separated` or `repeat`, will call a parser repeatedly,
+/// accumulating results in a `Vec`, until it encounters an error.
+/// If you want more control on the parser application, check out the `iterator`
+/// combinator (cf `examples/iterator.rs`)
+fn array<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<Vec<JsonValue>, E> {
+    preceded(
+        ('[', ws),
+        cut_err(terminated(
+            separated(0.., json_value, (ws, ',', ws)),
+            (ws, ']'),
+        )),
+    )
+    .context(StrContext::Expected("array".into()))
+    .parse_next(input)
+}
+
+fn object<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<HashMap<String, JsonValue>, E> {
+    preceded(
+        ('{', ws),
+        cut_err(terminated(
+            separated(0.., key_value, (ws, ',', ws)),
+            (ws, '}'),
+        )),
+    )
+    .context(StrContext::Expected("object".into()))
+    .parse_next(input)
+}
+
+fn key_value<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<(String, JsonValue), E> {
+    separated_pair(string, cut_err((ws, ':', ws)), json_value).parse_next(input)
+}
+
+/// Parser combinators are constructed from the bottom up:
+/// first we write parsers for the smallest elements (here a space character),
+/// then we'll combine them in larger parsers
+fn ws<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<&'i str, E> {
+    // Combinators like `take_while` return a function. That function is the
+    // parser,to which we can pass the input
+    take_while(0.., WS).parse_next(input)
+}
+
+const WS: &[char] = &[' ', '\t', '\r', '\n'];
+
+#[cfg(test)]
+mod test {
+    #[allow(clippy::useless_attribute)]
+    #[allow(unused_imports)] // its dead for benches
+    use super::*;
+
+    #[allow(clippy::useless_attribute)]
+    #[allow(dead_code)] // its dead for benches
+    type Error = winnow::error::ContextError;
+
+    #[test]
+    fn json_string() {
+        assert_eq!(string::<Error>.parse_peek("\"\""), Ok(("", "".to_owned())));
+        assert_eq!(
+            string::<Error>.parse_peek("\"abc\""),
+            Ok(("", "abc".to_owned()))
+        );
+        assert_eq!(
+            string::<Error>
+                .parse_peek("\"abc\\\"\\\\\\/\\b\\f\\n\\r\\t\\u0001\\u2014\u{2014}def\""),
+            Ok(("", "abc\"\\/\x08\x0C\n\r\t\x01——def".to_owned())),
+        );
+        assert_eq!(
+            string::<Error>.parse_peek("\"\\uD83D\\uDE10\""),
+            Ok(("", "😐".to_owned()))
+        );
+
+        assert!(string::<Error>.parse_peek("\"").is_err());
+        assert!(string::<Error>.parse_peek("\"abc").is_err());
+        assert!(string::<Error>.parse_peek("\"\\\"").is_err());
+        assert!(string::<Error>.parse_peek("\"\\u123\"").is_err());
+        assert!(string::<Error>.parse_peek("\"\\uD800\"").is_err());
+        assert!(string::<Error>.parse_peek("\"\\uD800\\uD800\"").is_err());
+        assert!(string::<Error>.parse_peek("\"\\uDC00\"").is_err());
+    }
+
+    #[test]
+    fn json_object() {
+        use JsonValue::{Num, Object, Str};
+
+        let input = r#"{"a":42,"b":"x"}"#;
+
+        let expected = Object(
+            vec![
+                ("a".to_owned(), Num(42.0)),
+                ("b".to_owned(), Str("x".to_owned())),
+            ]
+            .into_iter()
+            .collect(),
+        );
+
+        assert_eq!(json::<Error>.parse_peek(input), Ok(("", expected)));
+    }
+
+    #[test]
+    fn json_array() {
+        use JsonValue::{Array, Num, Str};
+
+        let input = r#"[42,"x"]"#;
+
+        let expected = Array(vec![Num(42.0), Str("x".to_owned())]);
+
+        assert_eq!(json::<Error>.parse_peek(input), Ok(("", expected)));
+    }
+
+    #[test]
+    fn json_whitespace() {
+        use JsonValue::{Array, Boolean, Null, Num, Object, Str};
+
+        let input = r#"
+  {
+    "null" : null,
+    "true"  :true ,
+    "false":  false  ,
+    "number" : 123e4 ,
+    "string" : " abc 123 " ,
+    "array" : [ false , 1 , "two" ] ,
+    "object" : { "a" : 1.0 , "b" : "c" } ,
+    "empty_array" : [  ] ,
+    "empty_object" : {   }
+  }
+  "#;
+
+        assert_eq!(
+            json::<Error>.parse_peek(input),
+            Ok((
+                "",
+                Object(
+                    vec![
+                        ("null".to_owned(), Null),
+                        ("true".to_owned(), Boolean(true)),
+                        ("false".to_owned(), Boolean(false)),
+                        ("number".to_owned(), Num(123e4)),
+                        ("string".to_owned(), Str(" abc 123 ".to_owned())),
+                        (
+                            "array".to_owned(),
+                            Array(vec![Boolean(false), Num(1.0), Str("two".to_owned())])
+                        ),
+                        (
+                            "object".to_owned(),
+                            Object(
+                                vec![
+                                    ("a".to_owned(), Num(1.0)),
+                                    ("b".to_owned(), Str("c".to_owned())),
+                                ]
+                                .into_iter()
+                                .collect()
+                            )
+                        ),
+                        ("empty_array".to_owned(), Array(vec![]),),
+                        ("empty_object".to_owned(), Object(HashMap::new()),),
+                    ]
+                    .into_iter()
+                    .collect()
+                )
+            ))
+        );
+    }
+}

vendor/winnow/examples/json/parser_dispatch.rs

@@ -0,0 +1,319 @@
+use std::collections::HashMap;
+use std::str;
+
+use winnow::prelude::*;
+use winnow::Result;
+use winnow::{
+    ascii::float,
+    combinator::empty,
+    combinator::fail,
+    combinator::peek,
+    combinator::{alt, dispatch},
+    combinator::{delimited, preceded, separated_pair, terminated},
+    combinator::{repeat, separated},
+    error::{AddContext, ParserError, StrContext},
+    token::{any, none_of, take, take_while},
+};
+
+use crate::json::JsonValue;
+
+pub(crate) type Stream<'i> = &'i str;
+
+/// The root element of a JSON parser is any value
+///
+/// A parser has the following signature:
+/// `&mut Stream -> Result<Output ContextError>`
+///
+/// most of the times you can ignore the error type and use the default (but this
+/// examples shows custom error types later on!)
+///
+/// Here we use `&str` as input type, but parsers can be generic over
+/// the input type, work directly with `&[u8]`, or any other type that
+/// implements the required traits.
+pub(crate) fn json<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> Result<JsonValue, E> {
+    delimited(ws, json_value, ws).parse_next(input)
+}
+
+/// `alt` is a combinator that tries multiple parsers one by one, until
+/// one of them succeeds
+fn json_value<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> Result<JsonValue, E> {
+    // `dispatch` gives you `match`-like behavior compared to `alt` successively trying different
+    // implementations.
+    dispatch!(peek(any);
+        'n' => null.value(JsonValue::Null),
+        't' => true_.map(JsonValue::Boolean),
+        'f' => false_.map(JsonValue::Boolean),
+        '"' => string.map(JsonValue::Str),
+        '+' => float.map(JsonValue::Num),
+        '-' => float.map(JsonValue::Num),
+        '0'..='9' => float.map(JsonValue::Num),
+        '[' => array.map(JsonValue::Array),
+        '{' => object.map(JsonValue::Object),
+        _ => fail,
+    )
+    .parse_next(input)
+}
+
+/// `literal(string)` generates a parser that takes the argument string.
+///
+/// This also shows returning a sub-slice of the original input
+fn null<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> Result<&'i str, E> {
+    // This is a parser that returns `"null"` if it sees the string "null", and
+    // an error otherwise
+    "null".parse_next(input)
+}
+
+/// We can combine `tag` with other functions, like `value` which returns a given constant value on
+/// success.
+fn true_<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> Result<bool, E> {
+    // This is a parser that returns `true` if it sees the string "true", and
+    // an error otherwise
+    "true".value(true).parse_next(input)
+}
+
+/// We can combine `tag` with other functions, like `value` which returns a given constant value on
+/// success.
+fn false_<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> Result<bool, E> {
+    // This is a parser that returns `false` if it sees the string "false", and
+    // an error otherwise
+    "false".value(false).parse_next(input)
+}
+
+/// This parser gathers all `char`s up into a `String`with a parse to take the double quote
+/// character, before the string (using `preceded`) and after the string (using `terminated`).
+fn string<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> Result<String, E> {
+    preceded(
+        '\"',
+        terminated(
+            repeat(0.., character).fold(String::new, |mut string, c| {
+                string.push(c);
+                string
+            }),
+            '\"',
+        ),
+    )
+    // `context` lets you add a static string to errors to provide more information in the
+    // error chain (to indicate which parser had an error)
+    .context(StrContext::Expected("string".into()))
+    .parse_next(input)
+}
+
+/// You can mix the above declarative parsing with an imperative style to handle more unique cases,
+/// like escaping
+fn character<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> Result<char, E> {
+    let c = none_of('\"').parse_next(input)?;
+    if c == '\\' {
+        dispatch!(any;
+          '"' => empty.value('"'),
+          '\\' => empty.value('\\'),
+          '/'  => empty.value('/'),
+          'b' => empty.value('\x08'),
+          'f' => empty.value('\x0C'),
+          'n' => empty.value('\n'),
+          'r' => empty.value('\r'),
+          't' => empty.value('\t'),
+          'u' => unicode_escape,
+          _ => fail,
+        )
+        .parse_next(input)
+    } else {
+        Ok(c)
+    }
+}
+
+fn unicode_escape<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> Result<char, E> {
+    alt((
+        // Not a surrogate
+        u16_hex
+            .verify(|cp| !(0xD800..0xE000).contains(cp))
+            .map(|cp| cp as u32),
+        // See https://en.wikipedia.org/wiki/UTF-16#Code_points_from_U+010000_to_U+10FFFF for details
+        separated_pair(u16_hex, "\\u", u16_hex)
+            .verify(|(high, low)| (0xD800..0xDC00).contains(high) && (0xDC00..0xE000).contains(low))
+            .map(|(high, low)| {
+                let high_ten = (high as u32) - 0xD800;
+                let low_ten = (low as u32) - 0xDC00;
+                (high_ten << 10) + low_ten + 0x10000
+            }),
+    ))
+    .verify_map(
+        // Could be probably replaced with .unwrap() or _unchecked due to the verify checks
+        std::char::from_u32,
+    )
+    .parse_next(input)
+}
+
+fn u16_hex<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> Result<u16, E> {
+    take(4usize)
+        .verify_map(|s| u16::from_str_radix(s, 16).ok())
+        .parse_next(input)
+}
+
+/// Some combinators, like `separated` or `repeat`, will call a parser repeatedly,
+/// accumulating results in a `Vec`, until it encounters an error.
+/// If you want more control on the parser application, check out the `iterator`
+/// combinator (cf `examples/iterator.rs`)
+fn array<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> Result<Vec<JsonValue>, E> {
+    preceded(
+        ('[', ws),
+        terminated(separated(0.., json_value, (ws, ',', ws)), (ws, ']')),
+    )
+    .context(StrContext::Expected("array".into()))
+    .parse_next(input)
+}
+
+fn object<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> Result<HashMap<String, JsonValue>, E> {
+    preceded(
+        ('{', ws),
+        terminated(separated(0.., key_value, (ws, ',', ws)), (ws, '}')),
+    )
+    .context(StrContext::Expected("object".into()))
+    .parse_next(input)
+}
+
+fn key_value<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> Result<(String, JsonValue), E> {
+    separated_pair(string, (ws, ':', ws), json_value).parse_next(input)
+}
+
+/// Parser combinators are constructed from the bottom up:
+/// first we write parsers for the smallest elements (here a space character),
+/// then we'll combine them in larger parsers
+fn ws<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> Result<&'i str, E> {
+    // Combinators like `take_while` return a function. That function is the
+    // parser,to which we can pass the input
+    take_while(0.., WS).parse_next(input)
+}
+
+const WS: &[char] = &[' ', '\t', '\r', '\n'];
+
+#[cfg(test)]
+mod test {
+    #[allow(clippy::useless_attribute)]
+    #[allow(unused_imports)] // its dead for benches
+    use super::*;
+
+    #[allow(clippy::useless_attribute)]
+    #[allow(dead_code)] // its dead for benches
+    type Error = winnow::error::ContextError;
+
+    #[test]
+    fn json_string() {
+        assert_eq!(string::<Error>.parse_peek("\"\""), Ok(("", "".to_owned())));
+        assert_eq!(
+            string::<Error>.parse_peek("\"abc\""),
+            Ok(("", "abc".to_owned()))
+        );
+        assert_eq!(
+            string::<Error>
+                .parse_peek("\"abc\\\"\\\\\\/\\b\\f\\n\\r\\t\\u0001\\u2014\u{2014}def\""),
+            Ok(("", "abc\"\\/\x08\x0C\n\r\t\x01——def".to_owned())),
+        );
+        assert_eq!(
+            string::<Error>.parse_peek("\"\\uD83D\\uDE10\""),
+            Ok(("", "😐".to_owned()))
+        );
+
+        assert!(string::<Error>.parse_peek("\"").is_err());
+        assert!(string::<Error>.parse_peek("\"abc").is_err());
+        assert!(string::<Error>.parse_peek("\"\\\"").is_err());
+        assert!(string::<Error>.parse_peek("\"\\u123\"").is_err());
+        assert!(string::<Error>.parse_peek("\"\\uD800\"").is_err());
+        assert!(string::<Error>.parse_peek("\"\\uD800\\uD800\"").is_err());
+        assert!(string::<Error>.parse_peek("\"\\uDC00\"").is_err());
+    }
+
+    #[test]
+    fn json_object() {
+        use JsonValue::{Num, Object, Str};
+
+        let input = r#"{"a":42,"b":"x"}"#;
+
+        let expected = Object(
+            vec![
+                ("a".to_owned(), Num(42.0)),
+                ("b".to_owned(), Str("x".to_owned())),
+            ]
+            .into_iter()
+            .collect(),
+        );
+
+        assert_eq!(json::<Error>.parse_peek(input), Ok(("", expected)));
+    }
+
+    #[test]
+    fn json_array() {
+        use JsonValue::{Array, Num, Str};
+
+        let input = r#"[42,"x"]"#;
+
+        let expected = Array(vec![Num(42.0), Str("x".to_owned())]);
+
+        assert_eq!(json::<Error>.parse_peek(input), Ok(("", expected)));
+    }
+
+    #[test]
+    fn json_whitespace() {
+        use JsonValue::{Array, Boolean, Null, Num, Object, Str};
+
+        let input = r#"
+  {
+    "null" : null,
+    "true"  :true ,
+    "false":  false  ,
+    "number" : 123e4 ,
+    "string" : " abc 123 " ,
+    "array" : [ false , 1 , "two" ] ,
+    "object" : { "a" : 1.0 , "b" : "c" } ,
+    "empty_array" : [  ] ,
+    "empty_object" : {   }
+  }
+  "#;
+
+        assert_eq!(
+            json::<Error>.parse_peek(input),
+            Ok((
+                "",
+                Object(
+                    vec![
+                        ("null".to_owned(), Null),
+                        ("true".to_owned(), Boolean(true)),
+                        ("false".to_owned(), Boolean(false)),
+                        ("number".to_owned(), Num(123e4)),
+                        ("string".to_owned(), Str(" abc 123 ".to_owned())),
+                        (
+                            "array".to_owned(),
+                            Array(vec![Boolean(false), Num(1.0), Str("two".to_owned())])
+                        ),
+                        (
+                            "object".to_owned(),
+                            Object(
+                                vec![
+                                    ("a".to_owned(), Num(1.0)),
+                                    ("b".to_owned(), Str("c".to_owned())),
+                                ]
+                                .into_iter()
+                                .collect()
+                            )
+                        ),
+                        ("empty_array".to_owned(), Array(vec![]),),
+                        ("empty_object".to_owned(), Object(HashMap::new()),),
+                    ]
+                    .into_iter()
+                    .collect()
+                )
+            ))
+        );
+    }
+}

vendor/winnow/examples/json/parser_partial.rs

@@ -0,0 +1,350 @@
+use std::collections::HashMap;
+use std::str;
+
+use winnow::prelude::*;
+use winnow::{
+    ascii::float,
+    combinator::alt,
+    combinator::cut_err,
+    combinator::{delimited, preceded, separated_pair, terminated},
+    combinator::{repeat, separated},
+    error::{AddContext, ParserError, StrContext},
+    stream::Partial,
+    token::{any, none_of, rest, take, take_while},
+};
+
+use crate::json::JsonValue;
+
+pub(crate) type Stream<'i> = Partial<&'i str>;
+
+/// The root element of a JSON parser is any value
+///
+/// A parser has the following signature:
+/// `&mut Stream -> ModalResult<Output, ContextError>`, with `ModalResult` defined as:
+/// `type ModalResult<O, E = ErrorKind> = Result<O, ErrMode<E>>;`
+///
+/// most of the times you can ignore the error type and use the default (but this
+/// examples shows custom error types later on!)
+///
+/// Here we use `&str` as input type, but parsers can be generic over
+/// the input type, work directly with `&[u8]`, or any other type that
+/// implements the required traits.
+pub(crate) fn json<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<JsonValue, E> {
+    delimited(ws, json_value, ws_or_eof).parse_next(input)
+}
+
+/// `alt` is a combinator that tries multiple parsers one by one, until
+/// one of them succeeds
+fn json_value<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<JsonValue, E> {
+    // `alt` combines the each value parser. It returns the result of the first
+    // successful parser, or an error
+    alt((
+        null.value(JsonValue::Null),
+        boolean.map(JsonValue::Boolean),
+        string.map(JsonValue::Str),
+        float.map(JsonValue::Num),
+        array.map(JsonValue::Array),
+        object.map(JsonValue::Object),
+    ))
+    .parse_next(input)
+}
+
+/// `literal(string)` generates a parser that takes the argument string.
+///
+/// This also shows returning a sub-slice of the original input
+fn null<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<&'i str, E> {
+    // This is a parser that returns `"null"` if it sees the string "null", and
+    // an error otherwise
+    "null".parse_next(input)
+}
+
+/// We can combine `tag` with other functions, like `value` which returns a given constant value on
+/// success.
+fn boolean<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<bool, E> {
+    // This is a parser that returns `true` if it sees the string "true", and
+    // an error otherwise
+    let parse_true = "true".value(true);
+
+    // This is a parser that returns `false` if it sees the string "false", and
+    // an error otherwise
+    let parse_false = "false".value(false);
+
+    alt((parse_true, parse_false)).parse_next(input)
+}
+
+/// This parser gathers all `char`s up into a `String`with a parse to take the double quote
+/// character, before the string (using `preceded`) and after the string (using `terminated`).
+fn string<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<String, E> {
+    preceded(
+        '\"',
+        // `cut_err` transforms an `ErrMode::Backtrack(e)` to `ErrMode::Cut(e)`, signaling to
+        // combinators like  `alt` that they should not try other parsers. We were in the
+        // right branch (since we found the `"` character) but encountered an error when
+        // parsing the string
+        cut_err(terminated(
+            repeat(0.., character).fold(String::new, |mut string, c| {
+                string.push(c);
+                string
+            }),
+            '\"',
+        )),
+    )
+    // `context` lets you add a static string to errors to provide more information in the
+    // error chain (to indicate which parser had an error)
+    .context(StrContext::Expected("string".into()))
+    .parse_next(input)
+}
+
+/// You can mix the above declarative parsing with an imperative style to handle more unique cases,
+/// like escaping
+fn character<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<char, E> {
+    let c = none_of('\"').parse_next(input)?;
+    if c == '\\' {
+        alt((
+            any.verify_map(|c| {
+                Some(match c {
+                    '"' | '\\' | '/' => c,
+                    'b' => '\x08',
+                    'f' => '\x0C',
+                    'n' => '\n',
+                    'r' => '\r',
+                    't' => '\t',
+                    _ => return None,
+                })
+            }),
+            preceded('u', unicode_escape),
+        ))
+        .parse_next(input)
+    } else {
+        Ok(c)
+    }
+}
+
+fn unicode_escape<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<char, E> {
+    alt((
+        // Not a surrogate
+        u16_hex
+            .verify(|cp| !(0xD800..0xE000).contains(cp))
+            .map(|cp| cp as u32),
+        // See https://en.wikipedia.org/wiki/UTF-16#Code_points_from_U+010000_to_U+10FFFF for details
+        separated_pair(u16_hex, "\\u", u16_hex)
+            .verify(|(high, low)| (0xD800..0xDC00).contains(high) && (0xDC00..0xE000).contains(low))
+            .map(|(high, low)| {
+                let high_ten = (high as u32) - 0xD800;
+                let low_ten = (low as u32) - 0xDC00;
+                (high_ten << 10) + low_ten + 0x10000
+            }),
+    ))
+    .verify_map(
+        // Could be probably replaced with .unwrap() or _unchecked due to the verify checks
+        std::char::from_u32,
+    )
+    .parse_next(input)
+}
+
+fn u16_hex<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<u16, E> {
+    take(4usize)
+        .verify_map(|s| u16::from_str_radix(s, 16).ok())
+        .parse_next(input)
+}
+
+/// Some combinators, like `separated` or `repeat`, will call a parser repeatedly,
+/// accumulating results in a `Vec`, until it encounters an error.
+/// If you want more control on the parser application, check out the `iterator`
+/// combinator (cf `examples/iterator.rs`)
+fn array<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<Vec<JsonValue>, E> {
+    preceded(
+        ('[', ws),
+        cut_err(terminated(
+            separated(0.., json_value, (ws, ',', ws)),
+            (ws, ']'),
+        )),
+    )
+    .context(StrContext::Expected("array".into()))
+    .parse_next(input)
+}
+
+fn object<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<HashMap<String, JsonValue>, E> {
+    preceded(
+        ('{', ws),
+        cut_err(terminated(
+            separated(0.., key_value, (ws, ',', ws)),
+            (ws, '}'),
+        )),
+    )
+    .context(StrContext::Expected("object".into()))
+    .parse_next(input)
+}
+
+fn key_value<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<(String, JsonValue), E> {
+    separated_pair(string, cut_err((ws, ':', ws)), json_value).parse_next(input)
+}
+
+/// Parser combinators are constructed from the bottom up:
+/// first we write parsers for the smallest elements (here a space character),
+/// then we'll combine them in larger parsers
+fn ws<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<&'i str, E> {
+    // Combinators like `take_while` return a function. That function is the
+    // parser,to which we can pass the input
+    take_while(0.., WS).parse_next(input)
+}
+
+fn ws_or_eof<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<&'i str, E> {
+    rest.verify(|s: &str| s.chars().all(|c| WS.contains(&c)))
+        .parse_next(input)
+}
+
+const WS: &[char] = &[' ', '\t', '\r', '\n'];
+
+#[cfg(test)]
+mod test {
+    #[allow(clippy::useless_attribute)]
+    #[allow(unused_imports)] // its dead for benches
+    use super::*;
+
+    #[allow(clippy::useless_attribute)]
+    #[allow(dead_code)] // its dead for benches
+    type Error = winnow::error::ContextError;
+
+    #[test]
+    fn json_string() {
+        assert_eq!(
+            string::<Error>.parse_peek(Partial::new("\"\"")),
+            Ok((Partial::new(""), "".to_owned()))
+        );
+        assert_eq!(
+            string::<Error>.parse_peek(Partial::new("\"abc\"")),
+            Ok((Partial::new(""), "abc".to_owned()))
+        );
+        assert_eq!(
+            string::<Error>.parse_peek(Partial::new(
+                "\"abc\\\"\\\\\\/\\b\\f\\n\\r\\t\\u0001\\u2014\u{2014}def\""
+            )),
+            Ok((
+                Partial::new(""),
+                "abc\"\\/\x08\x0C\n\r\t\x01——def".to_owned()
+            )),
+        );
+        assert_eq!(
+            string::<Error>.parse_peek(Partial::new("\"\\uD83D\\uDE10\"")),
+            Ok((Partial::new(""), "😐".to_owned()))
+        );
+
+        assert!(string::<Error>.parse_peek(Partial::new("\"")).is_err());
+        assert!(string::<Error>.parse_peek(Partial::new("\"abc")).is_err());
+        assert!(string::<Error>.parse_peek(Partial::new("\"\\\"")).is_err());
+        assert!(string::<Error>
+            .parse_peek(Partial::new("\"\\u123\""))
+            .is_err());
+        assert!(string::<Error>
+            .parse_peek(Partial::new("\"\\uD800\""))
+            .is_err());
+        assert!(string::<Error>
+            .parse_peek(Partial::new("\"\\uD800\\uD800\""))
+            .is_err());
+        assert!(string::<Error>
+            .parse_peek(Partial::new("\"\\uDC00\""))
+            .is_err());
+    }
+
+    #[test]
+    fn json_object() {
+        use JsonValue::{Num, Object, Str};
+
+        let input = r#"{"a":42,"b":"x"}"#;
+
+        let expected = Object(
+            vec![
+                ("a".to_owned(), Num(42.0)),
+                ("b".to_owned(), Str("x".to_owned())),
+            ]
+            .into_iter()
+            .collect(),
+        );
+
+        assert_eq!(
+            json::<Error>.parse_peek(Partial::new(input)),
+            Ok((Partial::new(""), expected))
+        );
+    }
+
+    #[test]
+    fn json_array() {
+        use JsonValue::{Array, Num, Str};
+
+        let input = r#"[42,"x"]"#;
+
+        let expected = Array(vec![Num(42.0), Str("x".to_owned())]);
+
+        assert_eq!(
+            json::<Error>.parse_peek(Partial::new(input)),
+            Ok((Partial::new(""), expected))
+        );
+    }
+
+    #[test]
+    fn json_whitespace() {
+        use JsonValue::{Array, Boolean, Null, Num, Object, Str};
+
+        let input = r#"
+  {
+    "null" : null,
+    "true"  :true ,
+    "false":  false  ,
+    "number" : 123e4 ,
+    "string" : " abc 123 " ,
+    "array" : [ false , 1 , "two" ] ,
+    "object" : { "a" : 1.0 , "b" : "c" } ,
+    "empty_array" : [  ] ,
+    "empty_object" : {   }
+  }
+  "#;
+
+        assert_eq!(
+            json::<Error>.parse_peek(Partial::new(input)),
+            Ok((
+                Partial::new(""),
+                Object(
+                    vec![
+                        ("null".to_owned(), Null),
+                        ("true".to_owned(), Boolean(true)),
+                        ("false".to_owned(), Boolean(false)),
+                        ("number".to_owned(), Num(123e4)),
+                        ("string".to_owned(), Str(" abc 123 ".to_owned())),
+                        (
+                            "array".to_owned(),
+                            Array(vec![Boolean(false), Num(1.0), Str("two".to_owned())])
+                        ),
+                        (
+                            "object".to_owned(),
+                            Object(
+                                vec![
+                                    ("a".to_owned(), Num(1.0)),
+                                    ("b".to_owned(), Str("c".to_owned())),
+                                ]
+                                .into_iter()
+                                .collect()
+                            )
+                        ),
+                        ("empty_array".to_owned(), Array(vec![]),),
+                        ("empty_object".to_owned(), Object(HashMap::new()),),
+                    ]
+                    .into_iter()
+                    .collect()
+                )
+            ))
+        );
+    }
+}

vendor/winnow/examples/json_iterator.rs

@@ -0,0 +1,311 @@
+use std::collections::HashMap;
+
+use winnow::prelude::*;
+use winnow::{
+    ascii::{alphanumeric1 as alphanumeric, float, take_escaped},
+    combinator::alt,
+    combinator::cut_err,
+    combinator::separated,
+    combinator::{preceded, separated_pair, terminated},
+    error::ParserError,
+    error::StrContext,
+    stream::Offset,
+    token::one_of,
+    token::{literal, take_while},
+};
+
+use std::cell::Cell;
+use std::str;
+
+#[derive(Clone, Debug)]
+pub struct JsonValue<'a, 'b> {
+    input: &'a str,
+    pub offset: &'b Cell<usize>,
+}
+
+impl<'a, 'b: 'a> JsonValue<'a, 'b> {
+    pub fn new(input: &'a str, offset: &'b Cell<usize>) -> JsonValue<'a, 'b> {
+        JsonValue { input, offset }
+    }
+
+    pub fn offset(&self, input: &'a str) {
+        let offset = input.offset_from(&self.input);
+        self.offset.set(offset);
+    }
+
+    pub fn data(&self) -> &'a str {
+        &self.input[self.offset.get()..]
+    }
+
+    pub fn string(&self) -> Option<&'a str> {
+        println!("string()");
+        let mut data = self.data();
+        match string(&mut data) {
+            Ok(s) => {
+                self.offset(data);
+                println!("-> {s}");
+                Some(s)
+            }
+            _ => None,
+        }
+    }
+
+    pub fn boolean(&self) -> Option<bool> {
+        println!("boolean()");
+        let mut data = self.data();
+        match boolean(&mut data) {
+            Ok(o) => {
+                self.offset(data);
+                println!("-> {o}");
+                Some(o)
+            }
+            _ => None,
+        }
+    }
+
+    pub fn number(&self) -> Option<f64> {
+        println!("number()");
+        let mut data = self.data();
+        match float::<_, _, ()>.parse_next(&mut data) {
+            Ok(o) => {
+                self.offset(data);
+                println!("-> {o}");
+                Some(o)
+            }
+            _ => None,
+        }
+    }
+
+    pub fn array(&self) -> Option<impl Iterator<Item = JsonValue<'a, 'b>>> {
+        println!("array()");
+
+        let mut data = self.data();
+        match literal::<_, _, ()>("[").parse_next(&mut data) {
+            Err(_) => None,
+            Ok(_) => {
+                println!("[");
+                self.offset(data);
+                let mut first = true;
+                let mut done = false;
+                let mut previous = usize::MAX;
+
+                let v = self.clone();
+
+                Some(std::iter::from_fn(move || {
+                    if done {
+                        return None;
+                    }
+
+                    // if we ignored one of the items, skip over the value
+                    if v.offset.get() == previous {
+                        println!("skipping value");
+                        if value(&mut data).is_ok() {
+                            v.offset(data);
+                        }
+                    }
+
+                    if literal::<_, _, ()>("]").parse_next(&mut data).is_ok() {
+                        println!("]");
+                        v.offset(data);
+                        done = true;
+                        return None;
+                    }
+
+                    if first {
+                        first = false;
+                    } else {
+                        match literal::<_, _, ()>(",").parse_next(&mut data) {
+                            Ok(_) => {
+                                println!(",");
+                                v.offset(data);
+                            }
+                            Err(_) => {
+                                done = true;
+                                return None;
+                            }
+                        }
+                    }
+
+                    println!("-> {}", v.data());
+                    previous = v.offset.get();
+                    Some(v.clone())
+                }))
+            }
+        }
+    }
+
+    pub fn object(&self) -> Option<impl Iterator<Item = (&'a str, JsonValue<'a, 'b>)>> {
+        println!("object()");
+        let mut data = self.data();
+        match literal::<_, _, ()>("{").parse_next(&mut data) {
+            Err(_) => None,
+            Ok(_) => {
+                self.offset(data);
+
+                println!("{{");
+
+                let mut first = true;
+                let mut done = false;
+                let mut previous = usize::MAX;
+
+                let v = self.clone();
+
+                Some(std::iter::from_fn(move || {
+                    if done {
+                        return None;
+                    }
+
+                    // if we ignored one of the items, skip over the value
+                    if v.offset.get() == previous {
+                        println!("skipping value");
+                        if value(&mut data).is_ok() {
+                            v.offset(data);
+                        }
+                    }
+
+                    if literal::<_, _, ()>("}").parse_next(&mut data).is_ok() {
+                        println!("}}");
+                        v.offset(data);
+                        done = true;
+                        return None;
+                    }
+
+                    if first {
+                        first = false;
+                    } else {
+                        match literal::<_, _, ()>(",").parse_next(&mut data) {
+                            Ok(_) => {
+                                println!(",");
+                                v.offset(data);
+                            }
+                            Err(_) => {
+                                done = true;
+                                return None;
+                            }
+                        }
+                    }
+
+                    match string(&mut data) {
+                        Ok(key) => {
+                            v.offset(data);
+
+                            match literal::<_, _, ()>(":").parse_next(&mut data) {
+                                Err(_) => None,
+                                Ok(_) => {
+                                    v.offset(data);
+
+                                    previous = v.offset.get();
+
+                                    println!("-> {} => {}", key, v.data());
+                                    Some((key, v.clone()))
+                                }
+                            }
+                        }
+                        _ => None,
+                    }
+                }))
+            }
+        }
+    }
+}
+
+fn sp<'a, E: ParserError<&'a str>>(i: &mut &'a str) -> ModalResult<&'a str, E> {
+    let chars = " \t\r\n";
+
+    take_while(0.., move |c| chars.contains(c)).parse_next(i)
+}
+
+fn parse_str<'a, E: ParserError<&'a str>>(i: &mut &'a str) -> ModalResult<&'a str, E> {
+    take_escaped(alphanumeric, '\\', one_of(['"', 'n', '\\'])).parse_next(i)
+}
+
+fn string<'s>(i: &mut &'s str) -> ModalResult<&'s str> {
+    preceded('\"', cut_err(terminated(parse_str, '\"')))
+        .context(StrContext::Label("string"))
+        .parse_next(i)
+}
+
+fn boolean(input: &mut &str) -> ModalResult<bool> {
+    alt(("false".map(|_| false), "true".map(|_| true))).parse_next(input)
+}
+
+fn array(i: &mut &str) -> ModalResult<()> {
+    preceded(
+        '[',
+        cut_err(terminated(
+            separated(0.., value, preceded(sp, ',')),
+            preceded(sp, ']'),
+        )),
+    )
+    .context(StrContext::Label("array"))
+    .parse_next(i)
+}
+
+fn key_value<'s>(i: &mut &'s str) -> ModalResult<(&'s str, ())> {
+    separated_pair(preceded(sp, string), cut_err(preceded(sp, ':')), value).parse_next(i)
+}
+
+fn hash(i: &mut &str) -> ModalResult<()> {
+    preceded(
+        '{',
+        cut_err(terminated(
+            separated(0.., key_value, preceded(sp, ',')),
+            preceded(sp, '}'),
+        )),
+    )
+    .context(StrContext::Label("map"))
+    .parse_next(i)
+}
+
+fn value(i: &mut &str) -> ModalResult<()> {
+    preceded(
+        sp,
+        alt((
+            hash,
+            array,
+            string.map(|_| ()),
+            float::<_, f64, _>.map(|_| ()),
+            boolean.map(|_| ()),
+        )),
+    )
+    .parse_next(i)
+}
+
+/// object(input) -> iterator over (key, `JsonValue`)
+/// array(input) -> iterator over `JsonValue`
+///
+/// JsonValue.string -> iterator over String (returns None after first successful call)
+///
+/// object(input).filter(|(k, _)| k == "users").flatten(|(_, v)| v.object()).filter(|(k, _)| k == "city").flatten(|(_,v)| `v.string()`)
+fn main() {
+    /*let data = "{
+    \"users\": {
+      \"user1\" : { \"city\": \"Nantes\", \"country\": \"France\" },
+      \"user2\" : { \"city\": \"Bruxelles\", \"country\": \"Belgium\" },
+      \"user3\": { \"city\": \"Paris\", \"country\": \"France\", \"age\": 30 }
+    },
+    \"countries\": [\"France\", \"Belgium\"]
+    }";
+    */
+    let data = "{\"users\":{\"user1\":{\"city\":\"Nantes\",\"country\":\"France\"},\"user2\":{\"city\":\"Bruxelles\",\"country\":\"Belgium\"},\"user3\":{\"city\":\"Paris\",\"country\":\"France\",\"age\":30}},\"countries\":[\"France\",\"Belgium\"]}";
+
+    let offset = Cell::new(0);
+    {
+        let parser = JsonValue::new(data, &offset);
+
+        if let Some(o) = parser.object() {
+            let s: HashMap<&str, &str> = o
+                .filter(|(k, _)| *k == "users")
+                .filter_map(|(_, v)| v.object())
+                .flatten()
+                .filter_map(|(user, v)| v.object().map(|o| (user, o)))
+                .flat_map(|(user, o)| {
+                    o.filter(|(k, _)| *k == "city")
+                        .filter_map(move |(_, v)| v.string().map(|s| (user, s)))
+                })
+                .collect();
+
+            println!("res = {s:?}");
+        }
+    };
+}

vendor/winnow/examples/ndjson/example.ndjson

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+

vendor/winnow/examples/ndjson/main.rs

@@ -0,0 +1,116 @@
+mod parser;
+
+use std::io::Read;
+
+use winnow::error::ContextError;
+use winnow::error::ErrMode;
+use winnow::error::Needed;
+use winnow::prelude::*;
+use winnow::stream::Offset;
+
+fn main() -> Result<(), lexopt::Error> {
+    let args = Args::parse()?;
+    let input = args.input.ok_or_else(|| lexopt::Error::MissingValue {
+        option: Some("<PATH>".to_owned()),
+    })?;
+
+    let mut file = std::fs::File::open(input).map_err(to_lexopt)?;
+
+    // Intentionally starting with a small buffer to make it easier to show `Incomplete` handling
+    let buffer_size = 10;
+    let min_buffer_growth = 100;
+    let buffer_growth_factor = 2;
+    let mut buffer = circular::Buffer::with_capacity(buffer_size);
+    loop {
+        let read = file.read(buffer.space()).map_err(to_lexopt)?;
+        eprintln!("read {read}");
+        if read == 0 {
+            // Should be EOF since we always make sure there is `available_space`
+            assert_ne!(buffer.available_space(), 0);
+            assert_eq!(
+                buffer.available_data(),
+                0,
+                "leftover data: {}",
+                String::from_utf8_lossy(buffer.data())
+            );
+            break;
+        }
+        buffer.fill(read);
+
+        loop {
+            let mut input =
+                parser::Stream::new(std::str::from_utf8(buffer.data()).map_err(to_lexopt)?);
+            let start = input.checkpoint();
+            match parser::ndjson::<ContextError>.parse_next(&mut input) {
+                Ok(value) => {
+                    println!("{value:?}");
+                    println!();
+                    // Tell the buffer how much we read
+                    let consumed = input.offset_from(&start);
+                    buffer.consume(consumed);
+                }
+                Err(ErrMode::Backtrack(e)) | Err(ErrMode::Cut(e)) => {
+                    return Err(fmt_lexopt(e.to_string()));
+                }
+                Err(ErrMode::Incomplete(Needed::Size(size))) => {
+                    // Without the format telling us how much space is required, we really should
+                    // treat this the same as `Unknown` but are doing this to demonstrate how to
+                    // handle `Size`.
+                    //
+                    // Even when the format has a header to tell us `Size`, we could hit incidental
+                    // `Size(1)`s, so make sure we buffer more space than that to avoid reading
+                    // one byte at a time
+                    let head_room = size.get().max(min_buffer_growth);
+                    let new_capacity = buffer.available_data() + head_room;
+                    eprintln!("growing buffer to {new_capacity}");
+                    buffer.grow(new_capacity);
+                    if buffer.available_space() < head_room {
+                        eprintln!("buffer shift");
+                        buffer.shift();
+                    }
+                    break;
+                }
+                Err(ErrMode::Incomplete(Needed::Unknown)) => {
+                    let new_capacity = buffer_growth_factor * buffer.capacity();
+                    eprintln!("growing buffer to {new_capacity}");
+                    buffer.grow(new_capacity);
+                    break;
+                }
+            }
+        }
+    }
+
+    Ok(())
+}
+
+#[derive(Default)]
+struct Args {
+    input: Option<std::path::PathBuf>,
+}
+
+impl Args {
+    fn parse() -> Result<Self, lexopt::Error> {
+        use lexopt::prelude::*;
+
+        let mut res = Args::default();
+
+        let mut args = lexopt::Parser::from_env();
+        while let Some(arg) = args.next()? {
+            match arg {
+                Value(input) => {
+                    res.input = Some(input.into());
+                }
+                _ => return Err(arg.unexpected()),
+            }
+        }
+        Ok(res)
+    }
+}
+
+fn to_lexopt(e: impl std::error::Error + Send + Sync + 'static) -> lexopt::Error {
+    lexopt::Error::Custom(Box::new(e))
+}
+
+fn fmt_lexopt(e: String) -> lexopt::Error {
+    lexopt::Error::Custom(e.into())
+}

vendor/winnow/examples/ndjson/parser.rs

@@ -0,0 +1,340 @@
+use std::collections::HashMap;
+use std::str;
+
+use winnow::prelude::*;
+use winnow::{
+    ascii::float,
+    ascii::line_ending,
+    combinator::alt,
+    combinator::cut_err,
+    combinator::{delimited, preceded, separated_pair, terminated},
+    combinator::{repeat, separated},
+    error::{AddContext, ParserError, StrContext},
+    stream::Partial,
+    token::{any, none_of, take, take_while},
+};
+
+#[derive(Debug, PartialEq, Clone)]
+pub(crate) enum JsonValue {
+    Null,
+    Boolean(bool),
+    Str(String),
+    Num(f64),
+    Array(Vec<JsonValue>),
+    Object(HashMap<String, JsonValue>),
+}
+
+/// Use `Partial` to cause `ErrMode::Incomplete` while parsing
+pub(crate) type Stream<'i> = Partial<&'i str>;
+
+pub(crate) fn ndjson<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<Option<JsonValue>, E> {
+    alt((
+        terminated(delimited(ws, json_value, ws), line_ending).map(Some),
+        line_ending.value(None),
+    ))
+    .parse_next(input)
+}
+
+// --Besides `WS`, same as a regular json parser ----------------------------
+
+/// `alt` is a combinator that tries multiple parsers one by one, until
+/// one of them succeeds
+fn json_value<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<JsonValue, E> {
+    // `alt` combines the each value parser. It returns the result of the first
+    // successful parser, or an error
+    alt((
+        null.value(JsonValue::Null),
+        boolean.map(JsonValue::Boolean),
+        string.map(JsonValue::Str),
+        float.map(JsonValue::Num),
+        array.map(JsonValue::Array),
+        object.map(JsonValue::Object),
+    ))
+    .parse_next(input)
+}
+
+/// `literal(string)` generates a parser that takes the argument string.
+///
+/// This also shows returning a sub-slice of the original input
+fn null<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<&'i str, E> {
+    // This is a parser that returns `"null"` if it sees the string "null", and
+    // an error otherwise
+    "null".parse_next(input)
+}
+
+/// We can combine `tag` with other functions, like `value` which returns a given constant value on
+/// success.
+fn boolean<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<bool, E> {
+    // This is a parser that returns `true` if it sees the string "true", and
+    // an error otherwise
+    let parse_true = "true".value(true);
+
+    // This is a parser that returns `false` if it sees the string "false", and
+    // an error otherwise
+    let parse_false = "false".value(false);
+
+    alt((parse_true, parse_false)).parse_next(input)
+}
+
+/// This parser gathers all `char`s up into a `String`with a parse to take the double quote
+/// character, before the string (using `preceded`) and after the string (using `terminated`).
+fn string<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<String, E> {
+    preceded(
+        '\"',
+        // `cut_err` transforms an `ErrMode::Backtrack(e)` to `ErrMode::Cut(e)`, signaling to
+        // combinators like  `alt` that they should not try other parsers. We were in the
+        // right branch (since we found the `"` character) but encountered an error when
+        // parsing the string
+        cut_err(terminated(
+            repeat(0.., character).fold(String::new, |mut string, c| {
+                string.push(c);
+                string
+            }),
+            '\"',
+        )),
+    )
+    // `context` lets you add a static string to errors to provide more information in the
+    // error chain (to indicate which parser had an error)
+    .context(StrContext::Expected("string".into()))
+    .parse_next(input)
+}
+
+/// You can mix the above declarative parsing with an imperative style to handle more unique cases,
+/// like escaping
+fn character<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<char, E> {
+    let c = none_of('"').parse_next(input)?;
+    if c == '\\' {
+        alt((
+            any.verify_map(|c| {
+                Some(match c {
+                    '"' | '\\' | '/' => c,
+                    'b' => '\x08',
+                    'f' => '\x0C',
+                    'n' => '\n',
+                    'r' => '\r',
+                    't' => '\t',
+                    _ => return None,
+                })
+            }),
+            preceded('u', unicode_escape),
+        ))
+        .parse_next(input)
+    } else {
+        Ok(c)
+    }
+}
+
+fn unicode_escape<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<char, E> {
+    alt((
+        // Not a surrogate
+        u16_hex
+            .verify(|cp| !(0xD800..0xE000).contains(cp))
+            .map(|cp| cp as u32),
+        // See https://en.wikipedia.org/wiki/UTF-16#Code_points_from_U+010000_to_U+10FFFF for details
+        separated_pair(u16_hex, "\\u", u16_hex)
+            .verify(|(high, low)| (0xD800..0xDC00).contains(high) && (0xDC00..0xE000).contains(low))
+            .map(|(high, low)| {
+                let high_ten = (high as u32) - 0xD800;
+                let low_ten = (low as u32) - 0xDC00;
+                (high_ten << 10) + low_ten + 0x10000
+            }),
+    ))
+    .verify_map(
+        // Could be probably replaced with .unwrap() or _unchecked due to the verify checks
+        std::char::from_u32,
+    )
+    .parse_next(input)
+}
+
+fn u16_hex<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<u16, E> {
+    take(4usize)
+        .verify_map(|s| u16::from_str_radix(s, 16).ok())
+        .parse_next(input)
+}
+
+/// Some combinators, like `separated` or `repeat`, will call a parser repeatedly,
+/// accumulating results in a `Vec`, until it encounters an error.
+/// If you want more control on the parser application, check out the `iterator`
+/// combinator (cf `examples/iterator.rs`)
+fn array<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<Vec<JsonValue>, E> {
+    preceded(
+        ('[', ws),
+        cut_err(terminated(
+            separated(0.., json_value, (ws, ',', ws)),
+            (ws, ']'),
+        )),
+    )
+    .context(StrContext::Expected("array".into()))
+    .parse_next(input)
+}
+
+fn object<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<HashMap<String, JsonValue>, E> {
+    preceded(
+        ('{', ws),
+        cut_err(terminated(
+            separated(0.., key_value, (ws, ',', ws)),
+            (ws, '}'),
+        )),
+    )
+    .context(StrContext::Expected("object".into()))
+    .parse_next(input)
+}
+
+fn key_value<'i, E: ParserError<Stream<'i>> + AddContext<Stream<'i>, StrContext>>(
+    input: &mut Stream<'i>,
+) -> ModalResult<(String, JsonValue), E> {
+    separated_pair(string, cut_err((ws, ':', ws)), json_value).parse_next(input)
+}
+
+/// Parser combinators are constructed from the bottom up:
+/// first we write parsers for the smallest elements (here a space character),
+/// then we'll combine them in larger parsers
+fn ws<'i, E: ParserError<Stream<'i>>>(input: &mut Stream<'i>) -> ModalResult<&'i str, E> {
+    // Combinators like `take_while` return a function. That function is the
+    // parser,to which we can pass the input
+    take_while(0.., WS).parse_next(input)
+}
+
+const WS: &[char] = &[' ', '\t'];
+
+#[cfg(test)]
+mod test {
+    #[allow(clippy::useless_attribute)]
+    #[allow(unused_imports)] // its dead for benches
+    use super::*;
+
+    #[allow(clippy::useless_attribute)]
+    #[allow(dead_code)] // its dead for benches
+    type Error = winnow::error::ContextError;
+
+    #[test]
+    fn json_string() {
+        assert_eq!(
+            string::<Error>.parse_peek(Partial::new("\"\"")),
+            Ok((Partial::new(""), "".to_owned()))
+        );
+        assert_eq!(
+            string::<Error>.parse_peek(Partial::new("\"abc\"")),
+            Ok((Partial::new(""), "abc".to_owned()))
+        );
+        assert_eq!(
+            string::<Error>.parse_peek(Partial::new(
+                "\"abc\\\"\\\\\\/\\b\\f\\n\\r\\t\\u0001\\u2014\u{2014}def\""
+            )),
+            Ok((
+                Partial::new(""),
+                "abc\"\\/\x08\x0C\n\r\t\x01——def".to_owned()
+            )),
+        );
+        assert_eq!(
+            string::<Error>.parse_peek(Partial::new("\"\\uD83D\\uDE10\"")),
+            Ok((Partial::new(""), "😐".to_owned()))
+        );
+
+        assert!(string::<Error>.parse_peek(Partial::new("\"")).is_err());
+        assert!(string::<Error>.parse_peek(Partial::new("\"abc")).is_err());
+        assert!(string::<Error>.parse_peek(Partial::new("\"\\\"")).is_err());
+        assert!(string::<Error>
+            .parse_peek(Partial::new("\"\\u123\""))
+            .is_err());
+        assert!(string::<Error>
+            .parse_peek(Partial::new("\"\\uD800\""))
+            .is_err());
+        assert!(string::<Error>
+            .parse_peek(Partial::new("\"\\uD800\\uD800\""))
+            .is_err());
+        assert!(string::<Error>
+            .parse_peek(Partial::new("\"\\uDC00\""))
+            .is_err());
+    }
+
+    #[test]
+    fn json_object() {
+        use JsonValue::{Num, Object, Str};
+
+        let input = r#"{"a":42,"b":"x"}
+"#;
+
+        let expected = Object(
+            vec![
+                ("a".to_owned(), Num(42.0)),
+                ("b".to_owned(), Str("x".to_owned())),
+            ]
+            .into_iter()
+            .collect(),
+        );
+
+        assert_eq!(
+            ndjson::<Error>.parse_peek(Partial::new(input)),
+            Ok((Partial::new(""), Some(expected)))
+        );
+    }
+
+    #[test]
+    fn json_array() {
+        use JsonValue::{Array, Num, Str};
+
+        let input = r#"[42,"x"]
+"#;
+
+        let expected = Array(vec![Num(42.0), Str("x".to_owned())]);
+
+        assert_eq!(
+            ndjson::<Error>.parse_peek(Partial::new(input)),
+            Ok((Partial::new(""), Some(expected)))
+        );
+    }
+
+    #[test]
+    fn json_whitespace() {
+        use JsonValue::{Array, Boolean, Null, Num, Object, Str};
+
+        let input = r#"  {    "null" : null,    "true"  :true ,    "false":  false  ,    "number" : 123e4 ,    "string" : " abc 123 " ,    "array" : [ false , 1 , "two" ] ,    "object" : { "a" : 1.0 , "b" : "c" } ,    "empty_array" : [  ] ,    "empty_object" : {   }  }  
+"#;
+
+        assert_eq!(
+            ndjson::<Error>.parse_peek(Partial::new(input)),
+            Ok((
+                Partial::new(""),
+                Some(Object(
+                    vec![
+                        ("null".to_owned(), Null),
+                        ("true".to_owned(), Boolean(true)),
+                        ("false".to_owned(), Boolean(false)),
+                        ("number".to_owned(), Num(123e4)),
+                        ("string".to_owned(), Str(" abc 123 ".to_owned())),
+                        (
+                            "array".to_owned(),
+                            Array(vec![Boolean(false), Num(1.0), Str("two".to_owned())])
+                        ),
+                        (
+                            "object".to_owned(),
+                            Object(
+                                vec![
+                                    ("a".to_owned(), Num(1.0)),
+                                    ("b".to_owned(), Str("c".to_owned())),
+                                ]
+                                .into_iter()
+                                .collect()
+                            )
+                        ),
+                        ("empty_array".to_owned(), Array(vec![]),),
+                        ("empty_object".to_owned(), Object(HashMap::new()),),
+                    ]
+                    .into_iter()
+                    .collect()
+                ))
+            ))
+        );
+    }
+}

vendor/winnow/examples/s_expression/main.rs

@@ -0,0 +1,20 @@
+//! In this example we build an [S-expression](https://en.wikipedia.org/wiki/S-expression)
+//! parser and tiny [lisp](https://en.wikipedia.org/wiki/Lisp_(programming_language)) interpreter.
+//! Lisp is a simple type of language made up of Atoms and Lists, forming easily parsable trees.
+
+#![cfg(feature = "alloc")]
+
+mod parser;
+
+fn main() {
+    let expression_1 = "((if (= (+ 3 (/ 9 3))
+         (* 2 3))
+     *
+     /)
+  456 123)";
+    println!(
+        "\"{}\"\nevaled gives us: {:?}",
+        expression_1,
+        parser::eval_from_str(expression_1)
+    );
+}

vendor/winnow/examples/s_expression/parser.rs

@@ -0,0 +1,361 @@
+//! In this example we build an [S-expression](https://en.wikipedia.org/wiki/S-expression)
+//! parser and tiny [lisp](https://en.wikipedia.org/wiki/Lisp_(programming_language)) interpreter.
+//! Lisp is a simple type of language made up of Atoms and Lists, forming easily parsable trees.
+
+use winnow::{
+    ascii::{alpha1, digit1, multispace0, multispace1},
+    combinator::alt,
+    combinator::repeat,
+    combinator::{cut_err, opt},
+    combinator::{delimited, preceded, terminated},
+    error::ContextError,
+    error::StrContext,
+    prelude::*,
+    token::one_of,
+};
+
+/// We start with a top-level function to tie everything together, letting
+/// us call eval on a string directly
+pub(crate) fn eval_from_str(src: &str) -> Result<Expr, String> {
+    parse_expr
+        .parse(src)
+        .map_err(|e| e.to_string())
+        .and_then(|exp| eval_expression(exp).ok_or_else(|| "Eval failed".to_owned()))
+}
+
+/// For parsing, we start by defining the types that define the shape of data that we want.
+/// In this case, we want something tree-like
+///
+/// The remaining half is Lists. We implement these as recursive Expressions.
+/// For a list of numbers, we have `'(1 2 3)`, which we'll parse to:
+/// ```
+/// Expr::Quote(vec![Expr::Constant(Atom::Num(1)),
+///                  Expr::Constant(Atom::Num(2)),
+///                  Expr::Constant(Atom::Num(3))])
+/// Quote takes an S-expression and prevents evaluation of it, making it a data
+/// structure that we can deal with programmatically. Thus any valid expression
+/// is also a valid data structure in Lisp itself.
+#[derive(Debug, Eq, PartialEq, Clone)]
+pub(crate) enum Expr {
+    Constant(Atom),
+    /// (func-name arg1 arg2)
+    Application(Box<Expr>, Vec<Expr>),
+    /// (if predicate do-this)
+    If(Box<Expr>, Box<Expr>),
+    /// (if predicate do-this otherwise-do-this)
+    IfElse(Box<Expr>, Box<Expr>, Box<Expr>),
+    /// '(3 (if (+ 3 3) 4 5) 7)
+    Quote(Vec<Expr>),
+}
+
+/// We now wrap this type and a few other primitives into our Atom type.
+/// Remember from before that Atoms form one half of our language.
+#[derive(Debug, Eq, PartialEq, Clone)]
+pub(crate) enum Atom {
+    Num(i32),
+    Keyword(String),
+    Boolean(bool),
+    BuiltIn(BuiltIn),
+}
+
+/// Now, the most basic type. We define some built-in functions that our lisp has
+#[derive(Debug, Eq, PartialEq, Clone, Copy)]
+pub(crate) enum BuiltIn {
+    Plus,
+    Minus,
+    Times,
+    Divide,
+    Equal,
+    Not,
+}
+
+/// With types defined, we move onto the top-level expression parser!
+fn parse_expr(i: &mut &'_ str) -> ModalResult<Expr> {
+    preceded(
+        multispace0,
+        alt((parse_constant, parse_application, parse_if, parse_quote)),
+    )
+    .parse_next(i)
+}
+
+/// We then add the Expr layer on top
+fn parse_constant(i: &mut &'_ str) -> ModalResult<Expr> {
+    parse_atom.map(Expr::Constant).parse_next(i)
+}
+
+/// Now we take all these simple parsers and connect them.
+/// We can now parse half of our language!
+fn parse_atom(i: &mut &'_ str) -> ModalResult<Atom> {
+    alt((
+        parse_num,
+        parse_bool,
+        parse_builtin.map(Atom::BuiltIn),
+        parse_keyword,
+    ))
+    .parse_next(i)
+}
+
+/// Next up is number parsing. We're keeping it simple here by accepting any number (> 1)
+/// of digits but ending the program if it doesn't fit into an i32.
+fn parse_num(i: &mut &'_ str) -> ModalResult<Atom> {
+    alt((
+        digit1.try_map(|digit_str: &str| digit_str.parse::<i32>().map(Atom::Num)),
+        preceded("-", digit1).map(|digit_str: &str| Atom::Num(-digit_str.parse::<i32>().unwrap())),
+    ))
+    .parse_next(i)
+}
+
+/// Our boolean values are also constant, so we can do it the same way
+fn parse_bool(i: &mut &'_ str) -> ModalResult<Atom> {
+    alt((
+        "#t".map(|_| Atom::Boolean(true)),
+        "#f".map(|_| Atom::Boolean(false)),
+    ))
+    .parse_next(i)
+}
+
+fn parse_builtin(i: &mut &'_ str) -> ModalResult<BuiltIn> {
+    // alt gives us the result of first parser that succeeds, of the series of
+    // parsers we give it
+    alt((
+        parse_builtin_op,
+        // map lets us process the parsed output, in this case we know what we parsed,
+        // so we ignore the input and return the BuiltIn directly
+        "not".map(|_| BuiltIn::Not),
+    ))
+    .parse_next(i)
+}
+
+/// Continuing the trend of starting from the simplest piece and building up,
+/// we start by creating a parser for the built-in operator functions.
+fn parse_builtin_op(i: &mut &'_ str) -> ModalResult<BuiltIn> {
+    // one_of matches one of the characters we give it
+    let t = one_of(['+', '-', '*', '/', '=']).parse_next(i)?;
+
+    // because we are matching single character tokens, we can do the matching logic
+    // on the returned value
+    Ok(match t {
+        '+' => BuiltIn::Plus,
+        '-' => BuiltIn::Minus,
+        '*' => BuiltIn::Times,
+        '/' => BuiltIn::Divide,
+        '=' => BuiltIn::Equal,
+        _ => unreachable!(),
+    })
+}
+
+/// The next easiest thing to parse are keywords.
+/// We introduce some error handling combinators: `context` for human readable errors
+/// and `cut_err` to prevent back-tracking.
+///
+/// Put plainly: `preceded(":", cut_err(alpha1))` means that once we see the `:`
+/// character, we have to see one or more alphabetic characters or the input is invalid.
+fn parse_keyword(i: &mut &'_ str) -> ModalResult<Atom> {
+    preceded(":", cut_err(alpha1))
+        .context(StrContext::Label("keyword"))
+        .map(|sym_str: &str| Atom::Keyword(sym_str.to_owned()))
+        .parse_next(i)
+}
+
+/// We can now use our new combinator to define the rest of the `Expr`s.
+///
+/// Starting with function application, we can see how the parser mirrors our data
+/// definitions: our definition is `Application(Box<Expr>, Vec<Expr>)`, so we know
+/// that we need to parse an expression and then parse 0 or more expressions, all
+/// wrapped in an S-expression.
+///
+/// tuples are themselves a parser, used to sequence parsers together, so we can translate this
+/// directly and then map over it to transform the output into an `Expr::Application`
+fn parse_application(i: &mut &'_ str) -> ModalResult<Expr> {
+    let application_inner = (parse_expr, repeat(0.., parse_expr))
+        .map(|(head, tail)| Expr::Application(Box::new(head), tail));
+    // finally, we wrap it in an s-expression
+    s_exp(application_inner).parse_next(i)
+}
+
+/// Because `Expr::If` and `Expr::IfElse` are so similar (we easily could have
+/// defined `Expr::If` to have an `Option` for the else block), we parse both
+/// in a single function.
+///
+/// In fact, we define our parser as if `Expr::If` was defined with an Option in it,
+/// we have the `opt` combinator which fits very nicely here.
+fn parse_if(i: &mut &'_ str) -> ModalResult<Expr> {
+    let if_inner = preceded(
+        // here to avoid ambiguity with other names starting with `if`, if we added
+        // variables to our language, we say that if must be terminated by at least
+        // one whitespace character
+        terminated("if", multispace1),
+        cut_err((parse_expr, parse_expr, opt(parse_expr))),
+    )
+    .map(|(pred, true_branch, maybe_false_branch)| {
+        if let Some(false_branch) = maybe_false_branch {
+            Expr::IfElse(
+                Box::new(pred),
+                Box::new(true_branch),
+                Box::new(false_branch),
+            )
+        } else {
+            Expr::If(Box::new(pred), Box::new(true_branch))
+        }
+    })
+    .context(StrContext::Label("if expression"));
+    s_exp(if_inner).parse_next(i)
+}
+
+/// A quoted S-expression is list data structure.
+///
+/// This example doesn't have the symbol atom, but by adding variables and changing
+/// the definition of quote to not always be around an S-expression, we'd get them
+/// naturally.
+fn parse_quote(i: &mut &'_ str) -> ModalResult<Expr> {
+    // this should look very straight-forward after all we've done:
+    // we find the `'` (quote) character, use cut_err to say that we're unambiguously
+    // looking for an s-expression of 0 or more expressions, and then parse them
+    preceded("'", cut_err(s_exp(repeat(0.., parse_expr))))
+        .context(StrContext::Label("quote"))
+        .map(Expr::Quote)
+        .parse_next(i)
+}
+
+/// Before continuing, we need a helper function to parse lists.
+/// A list starts with `(` and ends with a matching `)`.
+/// By putting whitespace and newline parsing here, we can avoid having to worry about it
+/// in much of the rest of the parser.
+//.parse_next/
+/// Unlike the previous functions, this function doesn't take or consume input, instead it
+/// takes a parsing function and returns a new parsing function.
+fn s_exp<'a, O1, F>(inner: F) -> impl ModalParser<&'a str, O1, ContextError>
+where
+    F: ModalParser<&'a str, O1, ContextError>,
+{
+    delimited(
+        '(',
+        preceded(multispace0, inner),
+        cut_err(preceded(multispace0, ')')).context(StrContext::Label("closing paren")),
+    )
+}
+
+/// And that's it!
+/// We can now parse our entire lisp language.
+///
+/// But in order to make it a little more interesting, we can hack together
+/// a little interpreter to take an Expr, which is really an
+/// [Abstract Syntax Tree](https://en.wikipedia.org/wiki/Abstract_syntax_tree) (AST),
+/// and give us something back
+///
+/// This function tries to reduce the AST.
+/// This has to return an Expression rather than an Atom because quoted `s_expressions`
+/// can't be reduced
+fn eval_expression(e: Expr) -> Option<Expr> {
+    match e {
+        // Constants and quoted s-expressions are our base-case
+        Expr::Constant(_) | Expr::Quote(_) => Some(e),
+        // we then recursively `eval_expression` in the context of our special forms
+        // and built-in operators
+        Expr::If(pred, true_branch) => {
+            let reduce_pred = eval_expression(*pred)?;
+            if get_bool_from_expr(reduce_pred)? {
+                eval_expression(*true_branch)
+            } else {
+                None
+            }
+        }
+        Expr::IfElse(pred, true_branch, false_branch) => {
+            let reduce_pred = eval_expression(*pred)?;
+            if get_bool_from_expr(reduce_pred)? {
+                eval_expression(*true_branch)
+            } else {
+                eval_expression(*false_branch)
+            }
+        }
+        Expr::Application(head, tail) => {
+            let reduced_head = eval_expression(*head)?;
+            let reduced_tail = tail
+                .into_iter()
+                .map(eval_expression)
+                .collect::<Option<Vec<Expr>>>()?;
+            if let Expr::Constant(Atom::BuiltIn(bi)) = reduced_head {
+                Some(Expr::Constant(match bi {
+                    BuiltIn::Plus => Atom::Num(
+                        reduced_tail
+                            .into_iter()
+                            .map(get_num_from_expr)
+                            .collect::<Option<Vec<i32>>>()?
+                            .into_iter()
+                            .sum(),
+                    ),
+                    BuiltIn::Times => Atom::Num(
+                        reduced_tail
+                            .into_iter()
+                            .map(get_num_from_expr)
+                            .collect::<Option<Vec<i32>>>()?
+                            .into_iter()
+                            .product(),
+                    ),
+                    BuiltIn::Equal => Atom::Boolean(
+                        reduced_tail
+                            .iter()
+                            .zip(reduced_tail.iter().skip(1))
+                            .all(|(a, b)| a == b),
+                    ),
+                    BuiltIn::Not => {
+                        if reduced_tail.len() != 1 {
+                            return None;
+                        } else {
+                            Atom::Boolean(!get_bool_from_expr(
+                                reduced_tail.first().cloned().unwrap(),
+                            )?)
+                        }
+                    }
+                    BuiltIn::Minus => {
+                        Atom::Num(if let Some(first_elem) = reduced_tail.first().cloned() {
+                            let fe = get_num_from_expr(first_elem)?;
+                            reduced_tail
+                                .into_iter()
+                                .map(get_num_from_expr)
+                                .collect::<Option<Vec<i32>>>()?
+                                .into_iter()
+                                .skip(1)
+                                .fold(fe, |a, b| a - b)
+                        } else {
+                            Default::default()
+                        })
+                    }
+                    BuiltIn::Divide => {
+                        Atom::Num(if let Some(first_elem) = reduced_tail.first().cloned() {
+                            let fe = get_num_from_expr(first_elem)?;
+                            reduced_tail
+                                .into_iter()
+                                .map(get_num_from_expr)
+                                .collect::<Option<Vec<i32>>>()?
+                                .into_iter()
+                                .skip(1)
+                                .fold(fe, |a, b| a / b)
+                        } else {
+                            Default::default()
+                        })
+                    }
+                }))
+            } else {
+                None
+            }
+        }
+    }
+}
+
+/// To start we define a couple of helper functions
+fn get_num_from_expr(e: Expr) -> Option<i32> {
+    if let Expr::Constant(Atom::Num(n)) = e {
+        Some(n)
+    } else {
+        None
+    }
+}
+
+fn get_bool_from_expr(e: Expr) -> Option<bool> {
+    if let Expr::Constant(Atom::Boolean(b)) = e {
+        Some(b)
+    } else {
+        None
+    }
+}

vendor/winnow/examples/string/main.rs

@@ -0,0 +1,70 @@
+//! This example shows an example of how to parse an escaped string. The
+//! rules for the string are similar to JSON and rust. A string is:
+//!
+//! - Enclosed by double quotes
+//! - Can contain any raw unescaped code point besides \ and "
+//! - Matches the following escape sequences: \b, \f, \n, \r, \t, \", \\, \/
+//! - Matches code points like Rust: \u{XXXX}, where XXXX can be up to 6
+//!   hex characters
+//! - an escape followed by whitespace consumes all whitespace between the
+//!   escape and the next non-whitespace character
+
+#![cfg(feature = "alloc")]
+
+mod parser;
+
+use winnow::prelude::*;
+
+fn main() -> Result<(), lexopt::Error> {
+    let args = Args::parse()?;
+
+    let data = args.input.as_deref().unwrap_or("\"abc\"");
+    let result = parser::parse_string::<()>.parse(data);
+    match result {
+        Ok(data) => println!("{data}"),
+        Err(err) => println!("{err:?}"),
+    }
+
+    Ok(())
+}
+
+#[derive(Default)]
+struct Args {
+    input: Option<String>,
+}
+
+impl Args {
+    fn parse() -> Result<Self, lexopt::Error> {
+        use lexopt::prelude::*;
+
+        let mut res = Args::default();
+
+        let mut args = lexopt::Parser::from_env();
+        while let Some(arg) = args.next()? {
+            match arg {
+                Value(input) => {
+                    res.input = Some(input.string()?);
+                }
+                _ => return Err(arg.unexpected()),
+            }
+        }
+        Ok(res)
+    }
+}
+
+#[test]
+fn simple() {
+    let data = "\"abc\"";
+    let result = parser::parse_string::<()>.parse(data);
+    assert_eq!(result, Ok(String::from("abc")));
+}
+
+#[test]
+fn escaped() {
+    let data = "\"tab:\\tafter tab, newline:\\nnew line, quote: \\\", emoji: \\u{1F602}, newline:\\nescaped whitespace: \\    abc\"";
+    let result = parser::parse_string::<()>.parse(data);
+    assert_eq!(
+        result,
+        Ok(String::from("tab:\tafter tab, newline:\nnew line, quote: \", emoji: 😂, newline:\nescaped whitespace: abc"))
+    );
+}

vendor/winnow/examples/string/parser.rs

@@ -0,0 +1,168 @@
+//! This example shows an example of how to parse an escaped string. The
+//! rules for the string are similar to JSON and rust. A string is:
+//!
+//! - Enclosed by double quotes
+//! - Can contain any raw unescaped code point besides \ and "
+//! - Matches the following escape sequences: \b, \f, \n, \r, \t, \", \\, \/
+//! - Matches code points like Rust: \u{XXXX}, where XXXX can be up to 6
+//!   hex characters
+//! - an escape followed by whitespace consumes all whitespace between the
+//!   escape and the next non-whitespace character
+
+use winnow::ascii::multispace1;
+use winnow::combinator::alt;
+use winnow::combinator::repeat;
+use winnow::combinator::{delimited, preceded};
+use winnow::error::{FromExternalError, ParserError};
+use winnow::prelude::*;
+use winnow::token::{take_till, take_while};
+use winnow::Result;
+
+/// Parse a string. Use a loop of `parse_fragment` and push all of the fragments
+/// into an output string.
+pub(crate) fn parse_string<'a, E>(input: &mut &'a str) -> Result<String, E>
+where
+    E: ParserError<&'a str> + FromExternalError<&'a str, std::num::ParseIntError>,
+{
+    // Repeat::fold is the equivalent of iterator::fold. It runs a parser in a loop,
+    // and for each output value, calls a folding function on each output value.
+    let build_string = repeat(
+        0..,
+        // Our parser function – parses a single string fragment
+        parse_fragment,
+    )
+    .fold(
+        // Our init value, an empty string
+        String::new,
+        // Our folding function. For each fragment, append the fragment to the
+        // string.
+        |mut string, fragment| {
+            match fragment {
+                StringFragment::Literal(s) => string.push_str(s),
+                StringFragment::EscapedChar(c) => string.push(c),
+                StringFragment::EscapedWS => {}
+            }
+            string
+        },
+    );
+
+    // Finally, parse the string. Note that, if `build_string` could accept a raw
+    // " character, the closing delimiter " would never match. When using
+    // `delimited` with a looping parser (like Repeat::fold), be sure that the
+    // loop won't accidentally match your closing delimiter!
+    delimited('"', build_string, '"').parse_next(input)
+}
+
+/// A string fragment contains a fragment of a string being parsed: either
+/// a non-empty Literal (a series of non-escaped characters), a single
+/// parsed escaped character, or a block of escaped whitespace.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum StringFragment<'a> {
+    Literal(&'a str),
+    EscapedChar(char),
+    EscapedWS,
+}
+
+/// Combine `parse_literal`, `parse_escaped_whitespace`, and `parse_escaped_char`
+/// into a `StringFragment`.
+fn parse_fragment<'a, E>(input: &mut &'a str) -> Result<StringFragment<'a>, E>
+where
+    E: ParserError<&'a str> + FromExternalError<&'a str, std::num::ParseIntError>,
+{
+    alt((
+        // The `map` combinator runs a parser, then applies a function to the output
+        // of that parser.
+        parse_literal.map(StringFragment::Literal),
+        parse_escaped_char.map(StringFragment::EscapedChar),
+        parse_escaped_whitespace.value(StringFragment::EscapedWS),
+    ))
+    .parse_next(input)
+}
+
+/// Parse a non-empty block of text that doesn't include \ or "
+fn parse_literal<'a, E: ParserError<&'a str>>(input: &mut &'a str) -> Result<&'a str, E> {
+    // `take_till` parses a string of 0 or more characters that aren't one of the
+    // given characters.
+    let not_quote_slash = take_till(1.., ['"', '\\']);
+
+    // `verify` runs a parser, then runs a verification function on the output of
+    // the parser. The verification function accepts the output only if it
+    // returns true. In this case, we want to ensure that the output of take_till
+    // is non-empty.
+    not_quote_slash
+        .verify(|s: &str| !s.is_empty())
+        .parse_next(input)
+}
+
+// parser combinators are constructed from the bottom up:
+// first we write parsers for the smallest elements (escaped characters),
+// then combine them into larger parsers.
+
+/// Parse an escaped character: \n, \t, \r, \u{00AC}, etc.
+fn parse_escaped_char<'a, E>(input: &mut &'a str) -> Result<char, E>
+where
+    E: ParserError<&'a str> + FromExternalError<&'a str, std::num::ParseIntError>,
+{
+    preceded(
+        '\\',
+        // `alt` tries each parser in sequence, returning the result of
+        // the first successful match
+        alt((
+            parse_unicode,
+            // The `value` parser returns a fixed value (the first argument) if its
+            // parser (the second argument) succeeds. In these cases, it looks for
+            // the marker characters (n, r, t, etc) and returns the matching
+            // character (\n, \r, \t, etc).
+            'n'.value('\n'),
+            'r'.value('\r'),
+            't'.value('\t'),
+            'b'.value('\u{08}'),
+            'f'.value('\u{0C}'),
+            '\\'.value('\\'),
+            '/'.value('/'),
+            '"'.value('"'),
+        )),
+    )
+    .parse_next(input)
+}
+
+/// Parse a unicode sequence, of the form u{XXXX}, where XXXX is 1 to 6
+/// hexadecimal numerals. We will combine this later with `parse_escaped_char`
+/// to parse sequences like \u{00AC}.
+fn parse_unicode<'a, E>(input: &mut &'a str) -> Result<char, E>
+where
+    E: ParserError<&'a str> + FromExternalError<&'a str, std::num::ParseIntError>,
+{
+    // `take_while` parses between `m` and `n` bytes (inclusive) that match
+    // a predicate. `parse_hex` here parses between 1 and 6 hexadecimal numerals.
+    let parse_hex = take_while(1..=6, |c: char| c.is_ascii_hexdigit());
+
+    // `preceded` takes a prefix parser, and if it succeeds, returns the result
+    // of the body parser. In this case, it parses u{XXXX}.
+    let parse_delimited_hex = preceded(
+        'u',
+        // `delimited` is like `preceded`, but it parses both a prefix and a suffix.
+        // It returns the result of the middle parser. In this case, it parses
+        // {XXXX}, where XXXX is 1 to 6 hex numerals, and returns XXXX
+        delimited('{', parse_hex, '}'),
+    );
+
+    // `try_map` takes the result of a parser and applies a function that returns
+    // a Result. In this case we take the hex bytes from parse_hex and attempt to
+    // convert them to a u32.
+    let parse_u32 = parse_delimited_hex.try_map(move |hex| u32::from_str_radix(hex, 16));
+
+    // verify_map is like try_map, but it takes an Option instead of a Result. If
+    // the function returns None, verify_map returns an error. In this case, because
+    // not all u32 values are valid unicode code points, we have to fallibly
+    // convert to char with from_u32.
+    parse_u32.verify_map(std::char::from_u32).parse_next(input)
+}
+
+/// Parse a backslash, followed by any amount of whitespace. This is used later
+/// to discard any escaped whitespace.
+fn parse_escaped_whitespace<'a, E: ParserError<&'a str>>(
+    input: &mut &'a str,
+) -> Result<&'a str, E> {
+    preceded('\\', multispace1).parse_next(input)
+}