On 12/13/2009 02:49 PM, Johannes Bittner wrote:
> Hello,
>
> The Java code generated for the following grammar produces a
> NoViableAltException when using "void foo (int a, int b) { foo }" as
> input, i.e. when the second token is "foo", it works otherwise. I
> tried this with antlrworks 1.3.1. Could somebody clearify why this
> happens?
Because 'foo' is a literal in your parser, it can never be an ID.
This is the difference between reserved words and keywords. If you need
to be able to match a literal as an ID, you need to make a parser rule like:
id: ID | 'foo' | 'int' | 'void';
> Thanks, Johannes
>
> method
> : type ID '(' args ')' ';'
> | type ID '(' args ')' '{' 'foo' '}'
> ;
>
> type: 'void' | 'int';
> args: arg (',' arg)*;
> arg: 'int' ID;
>
> ID : ('a'..'z'|'A'..'Z')+ ;
> INT : '0'..'9'+ ;
> WS : (' '|'\t'|'\r'|'\n')+ {skip();} ;
>
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