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Expression Parser [message #1770233]

Wed, 09 August 2017 09:34

Virag Purnam

Messages: 130
Registered: June 2014

Senior Member

In grammar for one of the field user can write expression as mentioned below.

isUsed = IF(<Condition>) THEN <True> ELSE <False>

In the generator part. We want to parse this and generate C code.
Can some body help me how to use antlr in this scenario?

Grammar is like :

Expression returns Expression:
OrExpression | IfThenElseExpression ;

OrExpression returns Expression:
AndExpression (=> ({BinaryOperation.left=current} feature=OpOr) right=OrExpression)*;

IfThenElseExpression returns Expression:
{IfThenElseExpression} 'IF' ifExpr=Expression 'THEN' thenExpr=Expression 'ELSE' elseExpr=Expression;

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