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Allow parsing of macros in statement position.

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Paul Stansifer 2012-11-13 23:45:25 -05:00 committed by Graydon Hoare
parent 9814e58815
commit bd92499c5e
1 changed files with 39 additions and 6 deletions
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45
src/libsyntax/parse/parser.rs
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@ -52,12 +52,12 @@ use ast::{_mod, add, arg, arm, attribute,
pat_tup, pat_uniq, pat_wild, path, private, Proto, ProtoBare,
ProtoBorrowed, ProtoBox, ProtoUniq, provided, public, pure_fn,
purity, re_static, re_self, re_anon, re_named, region,
rem, required, ret_style,
return_val, self_ty, shl, shr, stmt, stmt_decl, stmt_expr,
stmt_semi, struct_def, struct_field, struct_variant_kind,
subtract, sty_box, sty_by_ref, sty_region, sty_static, sty_uniq,
sty_value, token_tree, trait_method, trait_ref, tt_delim, tt_seq,
tt_tok, tt_nonterminal, tuple_variant_kind, Ty, ty_, ty_bot,
rem, required, ret_style, return_val, self_ty, shl, shr, stmt,
stmt_decl, stmt_expr, stmt_semi, stmt_mac, struct_def,
struct_field, struct_variant_kind, subtract, sty_box, sty_by_ref,
sty_region, sty_static, sty_uniq, sty_value, token_tree,
trait_method, trait_ref, tt_delim, tt_seq, tt_tok,
tt_nonterminal, tuple_variant_kind, Ty, ty_, ty_bot,
ty_box, ty_field, ty_fn, ty_infer, ty_mac, ty_method, ty_nil,
ty_param, ty_param_bound, ty_path, ty_ptr, ty_rec, ty_rptr,
ty_tup, ty_u32, ty_uniq, ty_vec, ty_fixed_length_vec,
@ -2207,6 +2207,39 @@ impl Parser {
self.expect_keyword(~"let");
let decl = self.parse_let();
return @spanned(lo, decl.span.hi, stmt_decl(decl, self.get_id()));
} else if is_ident(self.token)
&& !self.is_any_keyword(copy self.token)
&& self.look_ahead(1) == token::NOT {
// Potential trouble: if we allow macros with paths instead of
// idents, we'd need to look ahead past the whole path here...
let pth = self.parse_value_path();
self.bump();
let id = if self.token == token::LPAREN {
token::special_idents::invalid // no special identifier
} else {
self.parse_ident()
};
let tts = self.parse_unspanned_seq(
token::LPAREN, token::RPAREN, seq_sep_none(),
|p| p.parse_token_tree());
let hi = self.span.hi;
if id == token::special_idents::invalid {
return @spanned(lo, hi, stmt_mac(
spanned(lo, hi, mac_invoc_tt(pth, tts))));
} else {
// if it has a special ident, it's definitely an item
return @spanned(lo, hi, stmt_decl(
@spanned(lo, hi, decl_item(
self.mk_item(
lo, hi, id /*id is good here*/,
item_mac(spanned(lo, hi, mac_invoc_tt(pth, tts))),
inherited, ~[/*no attrs*/]))),
self.get_id()));
}
} else {
let mut item_attrs;
match self.parse_outer_attrs_or_ext(first_item_attrs) {