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use super::prelude::*;
use super::Eq;
/// An `= ...` e.g. inside an attribute `#[doc = ...]`.
///
/// To get unparsed tokens use `EqValue<TokenStream>`.
#[derive(Debug, TryClone, PartialEq, Eq, ToTokens, Parse, Spanned)]
#[try_clone(bound = {T: TryClone})]
pub struct EqValue<T> {
/// The `=` token.
pub eq: Eq,
/// The remainder.
pub value: T,
}
/// Parses `[{( ... )}]` ensuring that the delimiter is balanced.
#[derive(Debug, TryClone, PartialEq, Eq, ToTokens, Spanned)]
pub struct Group {
/// The opening delimiter.
pub open: ast::Token,
/// The content between the delimiters.
#[rune(iter)]
pub content: TokenStream,
/// The closing delimiter.
pub close: ast::Token,
}
impl Parse for Group {
fn parse(parser: &mut Parser<'_>) -> compile::Result<Self> {
let mut level = 1;
let open = parser.next()?;
let delim = match open.kind {
ast::Kind::Open(delim) => delim,
_ => {
return Err(compile::Error::expected(open, Expectation::OpenDelimiter));
}
};
let close;
let mut stream = Vec::new();
loop {
let token = parser.next()?;
match token.kind {
ast::Kind::Open(..) => level += 1,
ast::Kind::Close(actual) => {
level -= 1;
if level == 0 {
if actual != delim {
return Err(compile::Error::new(
open,
ErrorKind::ExpectedMacroCloseDelimiter {
actual: token.kind,
expected: ast::Kind::Close(delim),
},
));
}
close = token;
break;
}
}
_ => (),
}
stream.try_push(token)?;
}
Ok(Self {
open,
content: TokenStream::from(stream),
close,
})
}
}