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adding parse_path

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This commit is contained in:
John Clements 2013-03-27 12:36:10 -07:00
parent 28b285764c
commit ae4e09f71a
1 changed files with 35 additions and 20 deletions
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55
src/libsyntax/parse/parser.rs
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@ -900,30 +900,45 @@ pub impl Parser {
codemap::spanned { node: lit, span: mk_sp(lo, self.last_span.hi) }
}
// parse a path into a vector of idents, whether the path starts
// with ::, and a span.
fn parse_path(&self) -> (~[ast::ident],bool,span) {
let lo = self.span.lo;
let is_global = self.eat(&token::MOD_SEP);
let (ids,span{lo:_,hi,expn_info}) = self.parse_path_non_global();
(ids,is_global,span{lo:lo,hi:hi,expn_info:expn_info})
}
// parse a path beginning with an identifier into a vector of idents and a span
fn parse_path_non_global(&self) -> (~[ast::ident],span) {
let lo = self.span.lo;
let mut ids = ~[];
// must be at least one to begin:
ids.push(self.parse_ident());
loop {
match *self.token {
token::MOD_SEP => {
match self.look_ahead(1u) {
token::IDENT(id,_) => {
self.bump();
ids.push(self.parse_ident());
}
_ => break
}
}
_ => break
}
}
(ids, mk_sp(lo, self.last_span.hi))
}
// parse a path that doesn't have type parameters attached
fn parse_path_without_tps(&self)
-> @ast::Path {
maybe_whole!(self, nt_path);
let lo = self.span.lo;
let global = self.eat(&token::MOD_SEP);
let mut ids = ~[];
loop {
// if there's a ::< coming, stop processing
// the path.
let is_not_last =
self.look_ahead(2u) != token::LT
&& self.look_ahead(1u) == token::MOD_SEP;
if is_not_last {
ids.push(self.parse_ident());
self.expect(&token::MOD_SEP);
} else {
ids.push(self.parse_ident());
break;
}
}
@ast::Path { span: mk_sp(lo, self.last_span.hi),
global: global,
let (ids,is_global,sp) = self.parse_path();
@ast::Path { span: sp,
global: is_global,
idents: ids,
rp: None,
types: ~[] }