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/*
* Copyright 2007 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.dev.jjs.ast;
/**
* For precedence indices, see the Java Programming Language, 4th Edition, p.
* 750, Table 2. I just numbered the table top to bottom as 0 through 14. Lower
* number means higher precedence.
*/
public enum JBinaryOperator {
// Don't renumber precs without checking implementation of isShiftOperator()
MUL("*", 3), DIV("/", 3), MOD("%", 3), ADD("+", 4), CONCAT("+", 4), SUB("-", 4), SHL("<<", 5), SHR(
">>", 5), SHRU(">>>", 5), LT("<", 6), LTE("<=", 6), GT(">", 6), GTE(">=",
6), EQ("==", 7), NEQ("!=", 7), BIT_AND("&", 8), BIT_XOR("^", 9), BIT_OR(
"|", 10), AND("&&", 11), OR("||", 12), ASG("=", 14), ASG_ADD("+=", 14, ADD), ASG_CONCAT("+=", 14, CONCAT), ASG_SUB("-=", 14, SUB), ASG_MUL("*=", 14, MUL), ASG_DIV("/=", 14,
DIV), ASG_MOD("%=", 14, MOD), ASG_SHL("<<=", 14, SHL), ASG_SHR(">>=", 14,
SHR), ASG_SHRU(">>>=", 14, SHRU), ASG_BIT_AND("&=", 14, BIT_AND), ASG_BIT_OR(
"|=", 14, BIT_OR), ASG_BIT_XOR("^=", 14, BIT_XOR);
private final JBinaryOperator nonAsg;
private final int precedence;
private final char[] symbol;
private JBinaryOperator(String symbol, int precedence) {
this(symbol, precedence, null);
}
private JBinaryOperator(String symbol, int precedence, JBinaryOperator nonAsg) {
this.symbol = symbol.toCharArray();
this.precedence = precedence;
this.nonAsg = nonAsg;
}
public JBinaryOperator getNonAssignmentOf() {
return nonAsg;
}
public int getPrecedence() {
return precedence;
}
public char[] getSymbol() {
return symbol;
}
public boolean isAssignment() {
return (this == ASG) || (getNonAssignmentOf() != null);
}
public boolean isShiftOperator() {
// Fragile implementation.
return precedence == 5 || (nonAsg != null && nonAsg.precedence == 5);
}
@Override
public String toString() {
return new String(getSymbol());
}
}
