File: expression.h

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class Category;
class ExprNode;

ExprNode *createExprTree( string );
int exprTrueForCategory( ExprNode *, Category * );

string evaluateExprRec( Category *, ExprNode * );
int exprToTokens( string, vector<string> &tokenv );
int buildExpression( vector<string> &tokenv, ExprNode *, int &tokennr );
int buildClause( vector<string> &tokenv, ExprNode *, int &tokennr );
int buildTerm( vector<string> &tokenv, ExprNode *, int &tokennr );
void printNodeRec( ExprNode *, int depth );