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Add a predicate that determines whether a token can begin an expression

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This commit is contained in:
Tim Chevalier 2011-07-03 11:48:14 -07:00
parent 48a69d2100
commit 6369807ffe
1 changed files with 21 additions and 0 deletions
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21
src/comp/front/token.rs
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@ -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