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| author | Tim Chevalier <chevalier@alum.wellesley.edu> | 2011-07-03 11:48:14 -0700 |
|---|---|---|
| committer | Tim Chevalier <chevalier@alum.wellesley.edu> | 2011-07-03 11:51:46 -0700 |
| commit | 6369807ffedbe3f8fbfcef3febc5741dcf19cb43 (patch) | |
| tree | bab9dd38fb5ab01f30c897fc9277c479a052f094 /src | |
| parent | 48a69d2100622df88e3f1014eff00227401bf079 (diff) | |
| download | rust-6369807ffedbe3f8fbfcef3febc5741dcf19cb43.tar.gz rust-6369807ffedbe3f8fbfcef3febc5741dcf19cb43.zip | |
Add a predicate that determines whether a token can begin an expression
Diffstat (limited to 'src')
| -rw-r--r-- | src/comp/front/token.rs | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/comp/front/token.rs b/src/comp/front/token.rs index 50686d5093f..664a5db5e82 100644 --- a/src/comp/front/token.rs +++ b/src/comp/front/token.rs @@ -172,6 +172,27 @@ fn to_str(lexer::reader r, token t) -> str { case (EOF) { ret "<eof>"; } } } + + +pred can_begin_expr(token t) -> bool { + alt (t) { + case (LPAREN) { true } + case (LBRACE) { true } + case (IDENT(_,_)) { true } + case (UNDERSCORE) { true } + case (TILDE) { true } + case (LIT_INT(_)) { true } + case (LIT_UINT(_)) { true } + case (LIT_MACH_INT(_,_)) { true } + case (LIT_FLOAT(_)) { true } + case (LIT_MACH_FLOAT(_,_)) { true } + case (LIT_STR(_)) { true } + case (LIT_CHAR(_)) { true } + case (POUND) { true } + case (AT) { true } + case (_) { false } + } +} // Local Variables: // fill-column: 78; // indent-tabs-mode: nil |