[antlr-interest] failed predicate problem

[YINGAnnie]

Hello everyone,

 

There is my tree grammar, what I want to do is when $memberExpression.text.equals("Math.abs"), run the template of mathabs.

 

callExpression
    : ^(CALL_EXPRESSION memberExpression indexSuffix * propertyReferenceSuffix* argumentSuffix*)  
      {$memberExpression.text.equals("Math.abs")}? ->mathabs(x={$argumentSuffix.text})
    ;

 

When memberExpression is not equal to "Math.abs", everytime the parser goes to  callExpression,  the error of 

F:\Treegrammar.g: node from after line 4:28 rule callExpression failed predicate: {$memberExpression.text.equals("Math.abs")}? occur.

 

Does that an error, or I can just ignor that.

 

The even weird error is that when the memberExpression is  equal to "Math.abs", and the template of mathabs do run, however , the  failed predicate error is still there.

 

 

any idea?

 

 

Annie

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