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Copy pathfunc.rs
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158 lines (140 loc) · 4.43 KB
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use crate::SyntaxKind;
use super::{
define_scope,
expr_atom::BlockExprScope,
param::{parse_generic_params_opt, parse_where_clause_opt, FuncParamListScope},
token_stream::TokenStream,
type_::parse_type,
Parser,
};
define_scope! {
pub(crate) FuncScope {
fn_def_scope: FuncDefScope
},
Func,
Inheritance
}
#[derive(Clone, Copy, Debug)]
pub(crate) enum FuncDefScope {
Normal,
TraitDef,
Extern,
}
impl Default for FuncDefScope {
fn default() -> Self {
Self::Normal
}
}
impl super::Parse for FuncScope {
fn parse<S: TokenStream>(&mut self, parser: &mut Parser<S>) {
parser.bump_expected(SyntaxKind::FnKw);
match self.fn_def_scope {
FuncDefScope::Normal => parse_normal_fn_def_impl(parser),
FuncDefScope::TraitDef => parse_trait_fn_def_impl(parser),
FuncDefScope::Extern => parse_extern_fn_def_impl(parser),
}
}
}
fn parse_normal_fn_def_impl<S: TokenStream>(parser: &mut Parser<S>) {
parser.with_next_expected_tokens(
|parser| {
parser.bump_or_recover(
SyntaxKind::Ident,
"expected ident for the function name",
None,
)
},
&[SyntaxKind::Lt, SyntaxKind::LParen, SyntaxKind::LBrace],
);
parser.with_next_expected_tokens(
|parser| parse_generic_params_opt(parser, false),
&[SyntaxKind::LParen, SyntaxKind::LBrace],
);
parser.with_next_expected_tokens(
|parser| {
if parser.current_kind() == Some(SyntaxKind::LParen) {
parser.parse(FuncParamListScope::default(), None);
} else {
parser.error_and_recover("expected `(` for the function arguments", None);
}
},
&[SyntaxKind::LBrace, SyntaxKind::Arrow, SyntaxKind::WhereKw],
);
parser.with_next_expected_tokens(
|parser| {
if parser.bump_if(SyntaxKind::Arrow) {
parse_type(parser, None);
}
},
&[SyntaxKind::LBrace, SyntaxKind::WhereKw],
);
parser.with_next_expected_tokens(parse_where_clause_opt, &[SyntaxKind::LBrace]);
if parser.current_kind() == Some(SyntaxKind::LBrace) {
parser.parse(BlockExprScope::default(), None);
} else {
parser.error_and_recover("function body is required", None)
}
}
fn parse_trait_fn_def_impl<S: TokenStream>(parser: &mut Parser<S>) {
parser.with_next_expected_tokens(
|parser| {
parser.bump_or_recover(
SyntaxKind::Ident,
"expected ident for the function name",
None,
)
},
&[SyntaxKind::Lt, SyntaxKind::LParen],
);
parser.with_next_expected_tokens(
|parser| parse_generic_params_opt(parser, false),
&[SyntaxKind::LParen],
);
parser.with_recovery_tokens(
|parser| {
if parser.current_kind() == Some(SyntaxKind::LParen) {
parser.parse(FuncParamListScope::default(), None);
} else {
parser.error_and_recover("expected `(` for the function arguments", None);
}
},
&[SyntaxKind::LBrace, SyntaxKind::Arrow, SyntaxKind::WhereKw],
);
parser.with_recovery_tokens(
|parser| {
if parser.bump_if(SyntaxKind::Arrow) {
parse_type(parser, None);
}
},
&[SyntaxKind::LBrace, SyntaxKind::WhereKw],
);
parser.with_recovery_tokens(parse_where_clause_opt, &[SyntaxKind::LBrace]);
if parser.current_kind() == Some(SyntaxKind::LBrace) {
parser.parse(BlockExprScope::default(), None);
}
}
fn parse_extern_fn_def_impl<S: TokenStream>(parser: &mut Parser<S>) {
parser.with_next_expected_tokens(
|parser| {
parser.bump_or_recover(
SyntaxKind::Ident,
"expected identifier for the function name",
None,
)
},
&[SyntaxKind::LParen],
);
parser.with_recovery_tokens(
|parser| {
if parser.current_kind() == Some(SyntaxKind::LParen) {
parser.parse(FuncParamListScope::default(), None);
} else {
parser.error_and_recover("expected `(` for the function arguments", None);
}
},
&[SyntaxKind::Arrow],
);
if parser.bump_if(SyntaxKind::Arrow) {
parse_type(parser, None);
}
}