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