/*******************************************************************************
* Copyright (c) 2013 IBM Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package com.ibm.wala.cast.js.translator;
import com.ibm.wala.cast.ir.translator.ConstantFoldingRewriter;
import com.ibm.wala.cast.tree.CAst;
import com.ibm.wala.cast.tree.impl.CAstOperator;
public class JSConstantFoldingRewriter extends ConstantFoldingRewriter {
public JSConstantFoldingRewriter(CAst Ast) {
super(Ast);
}
@Override
protected Object eval(CAstOperator op, Object lhs, Object rhs) {
if (op == CAstOperator.OP_ADD) {
if (lhs instanceof String || rhs instanceof String) {
return "" + lhs + rhs;
} else if (lhs instanceof Number && rhs instanceof Number) {
return new Double(((Number)lhs).doubleValue() + ((Number)rhs).doubleValue());
}
} else if (op == CAstOperator.OP_BIT_AND) {
} else if (op == CAstOperator.OP_BIT_OR) {
} else if (op == CAstOperator.OP_BIT_XOR) {
} else if (op == CAstOperator.OP_BITNOT) {
} else if (op == CAstOperator.OP_CONCAT) {
if (lhs instanceof String || rhs instanceof String) {
return "" + lhs + rhs;
}
} else if (op == CAstOperator.OP_DIV) {
if (lhs instanceof Number && rhs instanceof Number) {
return new Double(((Number)lhs).doubleValue() / ((Number)rhs).doubleValue());
}
} else if (op == CAstOperator.OP_EQ) {
} else if (op == CAstOperator.OP_GE) {
if (lhs instanceof Number && rhs instanceof Number) {
return Boolean.valueOf(((Number)lhs).doubleValue() >= ((Number)rhs).doubleValue());
}
} else if (op == CAstOperator.OP_GT) {
if (lhs instanceof Number && rhs instanceof Number) {
return Boolean.valueOf(((Number)lhs).doubleValue() > ((Number)rhs).doubleValue());
}
} else if (op == CAstOperator.OP_LE) {
if (lhs instanceof Number && rhs instanceof Number) {
return Boolean.valueOf(((Number)lhs).doubleValue() <= ((Number)rhs).doubleValue());
}
} else if (op == CAstOperator.OP_LSH) {
} else if (op == CAstOperator.OP_LT) {
if (lhs instanceof Number && rhs instanceof Number) {
return Boolean.valueOf(((Number)lhs).doubleValue() < ((Number)rhs).doubleValue());
}
} else if (op == CAstOperator.OP_MOD) {
if (lhs instanceof Number && rhs instanceof Number) {
return new Double(((Number)lhs).doubleValue() % ((Number)rhs).doubleValue());
}
} else if (op == CAstOperator.OP_MUL) {
if (lhs instanceof Number && rhs instanceof Number) {
return new Double(((Number)lhs).doubleValue() * ((Number)rhs).doubleValue());
}
} else if (op == CAstOperator.OP_NE) {
} else if (op == CAstOperator.OP_NOT) {
} else if (op == CAstOperator.OP_REL_AND) {
} else if (op == CAstOperator.OP_REL_OR) {
} else if (op == CAstOperator.OP_REL_XOR) {
} else if (op == CAstOperator.OP_RSH) {
} else if (op == CAstOperator.OP_STRICT_EQ) {
} else if (op == CAstOperator.OP_STRICT_NE) {
} else if (op == CAstOperator.OP_SUB) {
if (lhs instanceof Number && rhs instanceof Number) {
return new Double(((Number)lhs).doubleValue() - ((Number)rhs).doubleValue());
}
} else if (op == CAstOperator.OP_URSH) {
}
// no constant value
return null;
}
}