[Grammatica-users] inherent ambiguity issue

[Ram Marzin]

 

Hello,

My name is Ram and I use grammatica SW as a part of my acadmic project in the university.

I use grammatica to help me develop c parser (an important part of my project).

 

I get an inherent ambiguity error which I cannot solve,

The code is:

/* _expression_ */
_expression_ = Term [ExpressionRest] ;
ExpressionRest = "+" _expression_
                         | "-" _expression_ ;
Term = Factor [TermRest] ;
TermRest = "*" Term
                   | "/" Term
                   | "%" Term ;
Factor = Atom
                   | "(" _expression_ ")" ;
Atom = Number
                   | STRING_DATA
                   | VARIABLE_NAME
                   | FunctionCall  
                   | Casting;
 
Number = INT_NUMBER | FLOAT_NUMBER;

/* Condition Statement */
Condition = ConditionTerm [ConditionRest] ;
ConditionRest = AND Condition
                       | OR Condition ;
ConditionTerm = ConditionAtom
                       | "(" Condition ")" ;     
ConditionAtom = Value ConditionOperator Value ;
ConditionOperator = "==" | "!=" | ">" | "<" | "<=" | ">=";
Value = _expression_;

 

The error is:

Error: in pt.grammar: lines 163-164:
    inherent ambiguity in production 'ConditionTerm' starting with
    token "("

ConditionTerm = ConditionAtom
                           | "(" Condition ")" ;

 

I understand why it happens, there is unlimit look ahead option but how can I solve it ?

 

Thanks,

Ram.

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