[antlr-interest] modified example T.g has no output

Michael West quagly at me.com
Sun Dec 5 11:03:17 PST 2010



I modified the an example T.g from the Definitive guide section 9.4 and now
it produces no output.  I only modified the grammar to take multiple
statements.  I did not change the supporting code or input.  Original
grammar from the book works fine and is:

grammar T;
options {output=template;}
s : ID '=' INT ';' -> assign(x={$ID.text},y={$INT.text}) ;
ID: 'a'..'z'+ ;
INT:'0'..'9'+ ;
WS :(' '|'\t'|'\n'|'\r') {skip();} ;

My modified grammar is:

grammar T;
options {output=template;}
s : (stat) + ;
stat : ID '=' INT ';'  -> assign(x={$ID.text},y={$INT.text}) ;
ID: 'a'..'z'+ ;
INT:'0'..'9'+ ;
WS :(' '|'\t'|'\n'|'\r') {skip();} ;

Sample input from the book:
x=101;

What do I need to do to get the same output while supporting multiple
statements?  Why does this produce no output?









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