[antlr-interest] Syntactic predicate or not...

[Tomasz Bluszcz]

Hi,
my lexer contains the following rules...
The difference between LegalName and LegalNameEx is that the LegalNameEx
containst the special character '.'  and the first char must not be a
letter.
My problem is to write the right LEGALNAME_OR_LEGALNAMEEX_OR_INT rule... I
think it is completely wrong..
Is it necessary to use a syntactic pradicate?


Many thanks ... Tom


protected DIGIT		:('0'..'9');
protected INT		:(MINUS)? ( DIGIT )+;

protected DOT		:'.';
protected LETTER		:('a'..'z' | 'A'..'Z' | '_');

protected LEGALNAME
options {
	testLiterals = true;
	paraphrase = "LegalName";
} :(LETTER) (LETTER|DIGIT)*;

protected	LEGALNAMEEX
options {
	testLiterals = true;
	paraphrase = "LegalNameEx";
} : ( DOT | LETTER | DIGIT )+;


LEGALNAME_OR_LEGALNAMEEX_OR_INT
options {
	testLiterals = true;
	paraphrase = "LegalName_OR_LegalNameEx_OR_Int";
}	
	:(( DOT | DIGIT | BACKSLASH )+) => LEGALNAMEEX 
	|( LETTER (LETTER|DIGIT)*) => LEGALNAME { $setType(LEGALNAME); }
	|( INT ) { $setType(INT); }
	;