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use rustc_ast::ast;
use rustc_ast::ptr::P;
use rustc_ast::token::TokenKind;
use rustc_ast::tokenstream::TokenStream;
use rustc_span::symbol::{self, kw};
use crate::rewrite::RewriteContext;
pub(crate) fn parse_lazy_static(
context: &RewriteContext<'_>,
ts: TokenStream,
) -> Option<Vec<(ast::Visibility, symbol::Ident, P<ast::Ty>, P<ast::Expr>)>> {
let mut result = vec![];
let mut parser = super::build_parser(context, ts);
macro_rules! parse_or {
($method:ident $(,)* $($arg:expr),* $(,)*) => {
match parser.$method($($arg,)*) {
Ok(val) => {
if parser.sess.span_diagnostic.has_errors().is_some() {
parser.sess.span_diagnostic.reset_err_count();
return None;
} else {
val
}
}
Err(err) => {
err.cancel();
parser.sess.span_diagnostic.reset_err_count();
return None;
}
}
}
}
while parser.token.kind != TokenKind::Eof {
let vis = parse_or!(parse_visibility, rustc_parse::parser::FollowedByType::No);
parser.eat_keyword(kw::Static);
parser.eat_keyword(kw::Ref);
let id = parse_or!(parse_ident);
parser.eat(&TokenKind::Colon);
let ty = parse_or!(parse_ty);
parser.eat(&TokenKind::Eq);
let expr = parse_or!(parse_expr);
parser.eat(&TokenKind::Semi);
result.push((vis, id, ty, expr));
}
Some(result)
}