[#ANTLR-24] generates unknown n_1 variable

ANTLR v3

generates unknown n_1 variable

Created: 06/Nov/06 06:29 PM Updated: 20/Apr/07 01:32 PM

Component/s:

ANTLR Core

Affects Version/s:

3.0

Fix Version/s:

3.0b8

Description

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With the following grammar

grammar a;
options {output=AST;}
tokens {PARMS;}

modulo
: 'modulo' ID ('(' parms+ ')')? -> ^('modulo' ID ^(PARMS parms+)?)
;
parms : '#'|ID;
ID : ('a'..'z' | 'A'..'Z')*;
WS : (' ' | '\t' | '\n' | '\r')+ {channel=99;} ;
The compiler result is

a.java:150: cannot find symbol
symbol : variable n_1
location: class a
                if ( n_1 > 1 ) throw new RuntimeException(" list has >
1 elements");
                     ^
a.java :151: cannot find symbol
symbol : variable n_1
location: class a
                if ( n_1==1 ) {
                     ^

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Terence Parr - 16/Dec/06 06:39 PM

A better example is

grammar t;
options {output=AST;}

tokens { VARDEF; }

a : 'int' ID? -> VARDEF? ;

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Terence Parr - 20/Apr/07 01:32 PM

Fixed by making (...)? blocks test all refs nested within for content.