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grammarxtext

Ignore whitespace in Xtext rule

I have the following rule: 

ASTMin:
    MinKeyword '(' expression=ASTSimple ')';

MinKeyword: 'min';

For an expression like min (4) the parser creates the error message:

extraneous input ' ' expecting '('

Where can I disable the whitespace behaviour?

Solution

  • To solve it just add the terminal rule "WS" in hidden in the top of your grammar as following: 

    grammar org.your.Dsl hidden(WS, ML_COMMENT, SL_COMMENT)

    If you are using the Xtext Terminals grammar : 

    grammar org.your.Dsl with org.eclipse.xtext.common.Terminals hidden(WS, ML_COMMENT, SL_COMMENT)