93 lines
2.4 KiB
Rust
93 lines
2.4 KiB
Rust
macro_rules! try_next {
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($iter:expr, $($tt:tt)*) => {
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match $iter.next() {
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Some(e) => e,
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None => return Err(crate::Error::InvalidFormat(format!($($tt)*))),
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}
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}
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}
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macro_rules! try_text {
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($node:expr) => {
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match $node.text() {
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Some(t) => t,
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None => return Err(crate::Error::InvalidFormat("Can't get text".into())),
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}
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};
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}
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macro_rules! parse_attrs_opt {
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($node:expr, { $($key:expr => $lvalue:expr,)+ } $(, { $($str_key:expr => $str_lvalue:expr,)+ } )?) => {
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for attr in $node.attributes() {
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match attr.name() {
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$(
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$key => $lvalue = attr.value().parse().ok()?,
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)+
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$(
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$(
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$str_key => $str_lvalue = attr.value().into(),
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)+
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)?
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_ => {}
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}
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}
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};
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}
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macro_rules! parse_attrs {
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($node:expr, { $($key:expr => $lvalue:expr,)+ } $(, { $($str_key:expr => $str_lvalue:expr,)+ } )?) => {
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for attr in $node.attributes() {
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match attr.name() {
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$(
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$key => $lvalue = attr.value().parse()?,
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)+
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$(
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$(
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$str_key => $str_lvalue = attr.value().into(),
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)+
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)?
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_ => {}
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}
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}
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};
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}
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macro_rules! parse_enum {
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(
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$ty:ty,
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$(
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($variant:ident, $text:expr),
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)+
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|$arg:ident| $fallback:expr,
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) => {
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impl core::str::FromStr for $ty {
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type Err = crate::Error;
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fn from_str($arg: &str) -> crate::Result<$ty> {
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match $arg {
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$(
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$text => Ok(<$ty>::$variant),
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)+
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_ => {
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$fallback
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}
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}
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}
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}
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};
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(
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$ty:ty,
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$(
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($variant:ident, $text:expr),
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)+
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) => {
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parse_enum! {
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$ty,
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$(
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($variant, $text),
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)+
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|s| Err(crate::Error::ParseEnumError(core::any::type_name::<$ty>(), s.into())),
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}
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};
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}
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