Complex look-ahead

Examples > Java > Complex look ahead

In the block statement production the same production is called for a look-ahead, which shall be executed in the success case:

IF( LocalVariableDeclaration() )

LocalVariableDeclaration ";"

ELSE

(

   ClassOrInterfaceDeclaration

| Statement

)

END

Attention: depending on the fact whether the testing of all literal tokens is activated in the project options or not, the call of LocalVariableDeclaration for a look-ahead can have different results.  For example, if the token return - one of the alternatives of Statement - follows, it will be recognized as an identifier ident, if not all literal tokens are tested, but only the first set of LocalVariableDeclaration. So e.g. "return true;" would be interpreted as a local variable declaration, what surely is wrong.

Remark:

Indirectly further look-ahead parsers can be invoked while testing, whether LocalVariableDeclaration matches the actual text or not.

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