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| 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 package com.google.dart.compiler.backend.js.ast; | |
| 6 | |
| 7 /** | |
| 8 * Represents the operator in a JavaScript binary operation. | |
| 9 */ | |
| 10 public enum JsBinaryOperator implements JsOperator { | |
| 11 | |
| 12 /* | |
| 13 * Precedence indices from "JavaScript - The Definitive Guide" 4th Edition | |
| 14 * (page 57) | |
| 15 * | |
| 16 * | |
| 17 * Precedence 15 is for really important things that have their own AST | |
| 18 * classes. | |
| 19 * | |
| 20 * Precedence 14 is for unary operators. | |
| 21 */ | |
| 22 | |
| 23 MUL("*", 13, LEFT | INFIX), DIV("/", 13, LEFT | INFIX), MOD("%", 13, LEFT | |
| 24 | INFIX), | |
| 25 | |
| 26 ADD("+", 12, LEFT | INFIX), SUB("-", 12, LEFT | INFIX), | |
| 27 | |
| 28 SHL("<<", 11, LEFT | INFIX), SHR(">>", 11, LEFT | INFIX), SHRU(">>>", 11, | |
| 29 LEFT | INFIX), | |
| 30 | |
| 31 LT("<", 10, LEFT | INFIX), LTE("<=", 10, LEFT | INFIX), GT(">", 10, LEFT | |
| 32 | INFIX), GTE(">=", 10, LEFT | INFIX), INSTANCEOF("instanceof", 10, LEFT | |
| 33 | INFIX), INOP("in", 10, LEFT | INFIX), | |
| 34 | |
| 35 EQ("==", 9, LEFT | INFIX), NEQ("!=", 9, LEFT | INFIX), REF_EQ("===", 9, LEFT | |
| 36 | INFIX), REF_NEQ("!==", 9, LEFT | INFIX), | |
| 37 | |
| 38 BIT_AND("&", 8, LEFT | INFIX), | |
| 39 | |
| 40 BIT_XOR("^", 7, LEFT | INFIX), | |
| 41 | |
| 42 BIT_OR("|", 6, LEFT | INFIX), | |
| 43 | |
| 44 AND("&&", 5, LEFT | INFIX), | |
| 45 | |
| 46 OR("||", 4, LEFT | INFIX), | |
| 47 | |
| 48 // Precedence 3 is for the condition operator. | |
| 49 | |
| 50 // These assignment operators are right-associative. | |
| 51 ASG("=", 2, INFIX), ASG_ADD("+=", 2, INFIX), ASG_SUB("-=", 2, INFIX), ASG_MUL( | |
| 52 "*=", 2, INFIX), ASG_DIV("/=", 2, INFIX), ASG_MOD("%=", 2, INFIX), ASG_SHL
( | |
| 53 "<<=", 2, INFIX), ASG_SHR(">>=", 2, INFIX), ASG_SHRU(">>>=", 2, INFIX), AS
G_BIT_AND( | |
| 54 "&=", 2, INFIX), ASG_BIT_OR("|=", 2, INFIX), ASG_BIT_XOR("^=", 2, INFIX), | |
| 55 | |
| 56 COMMA(",", 1, LEFT | INFIX); | |
| 57 | |
| 58 private final int mask; | |
| 59 private final int precedence; | |
| 60 private final String symbol; | |
| 61 | |
| 62 private JsBinaryOperator(String symbol, int precedence, int mask) { | |
| 63 this.symbol = symbol; | |
| 64 this.precedence = precedence; | |
| 65 this.mask = mask; | |
| 66 } | |
| 67 | |
| 68 @Override | |
| 69 public int getPrecedence() { | |
| 70 return precedence; | |
| 71 } | |
| 72 | |
| 73 @Override | |
| 74 public String getSymbol() { | |
| 75 return symbol; | |
| 76 } | |
| 77 | |
| 78 public boolean isAssignment() { | |
| 79 /* | |
| 80 * Beware, flaky! Maybe I should have added Yet Another Field to | |
| 81 * BinaryOperator? | |
| 82 */ | |
| 83 return (getPrecedence() == ASG.getPrecedence()); | |
| 84 } | |
| 85 | |
| 86 @Override | |
| 87 public boolean isKeyword() { | |
| 88 return this == INSTANCEOF || this == INOP; | |
| 89 } | |
| 90 | |
| 91 @Override | |
| 92 public boolean isLeftAssociative() { | |
| 93 return (mask & LEFT) != 0; | |
| 94 } | |
| 95 | |
| 96 @Override | |
| 97 public boolean isPrecedenceLessThan(JsOperator other) { | |
| 98 return precedence < other.getPrecedence(); | |
| 99 } | |
| 100 | |
| 101 @Override | |
| 102 public boolean isValidInfix() { | |
| 103 return (mask & INFIX) != 0; | |
| 104 } | |
| 105 | |
| 106 @Override | |
| 107 public boolean isValidPostfix() { | |
| 108 return (mask & POSTFIX) != 0; | |
| 109 } | |
| 110 | |
| 111 @Override | |
| 112 public boolean isValidPrefix() { | |
| 113 return (mask & PREFIX) != 0; | |
| 114 } | |
| 115 | |
| 116 @Override | |
| 117 public String toString() { | |
| 118 return symbol; | |
| 119 } | |
| 120 } | |
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Chromium Code Reviews
Issue 9479013:
Remove backends. (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart