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V3 semantic predicate gate (=>) can only appear after a predicate {...}?, not an action {...}

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Sam Harwell 2012-11-18 18:00:19 -06:00
parent 3e91065824
commit aace1ce399
1 changed files with 10 additions and 9 deletions
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19
tool/src/org/antlr/v4/parse/ANTLRLexer.g
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@ -298,15 +298,16 @@ ARG_ACTION
//
ACTION
: NESTED_ACTION
('?' {$type = SEMPRED;} )?
( '=>' // v3 gated sempred
{
Token t = new CommonToken(input, state.type, state.channel, state.tokenStartCharIndex, getCharIndex()-1);
t.setLine(state.tokenStartLine);
t.setText(state.text);
t.setCharPositionInLine(state.tokenStartCharPositionInLine);
grammarError(ErrorType.V3_GATED_SEMPRED, t);
}
( '?' {$type = SEMPRED;}
( '=>' // v3 gated sempred
{
Token t = new CommonToken(input, state.type, state.channel, state.tokenStartCharIndex, getCharIndex()-1);
t.setLine(state.tokenStartLine);
t.setText(state.text);
t.setCharPositionInLine(state.tokenStartCharPositionInLine);
grammarError(ErrorType.V3_GATED_SEMPRED, t);
}
)?
)?
;