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1 /*
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2 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
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3 * code is released under a tri EPL/GPL/LGPL license. You can use it,
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4 * redistribute it and/or modify it under the terms of the:
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5 *
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6 * Eclipse Public License version 1.0
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7 * GNU General Public License version 2
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8 * GNU Lesser General Public License version 2.1
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9 */
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10 package com.oracle.truffle.ruby.runtime.core;
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11
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12 import java.util.regex.*;
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13
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14 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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15 import com.oracle.truffle.api.frame.*;
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16 import com.oracle.truffle.ruby.runtime.*;
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17 import com.oracle.truffle.ruby.runtime.objects.*;
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18
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19 /**
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20 * Represents the Ruby {@code Regexp} class.
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21 */
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22 public class RubyRegexp extends RubyObject {
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23
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24 /**
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25 * The class from which we create the object that is {@code Regexp}. A subclass of
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26 * {@link RubyClass} so that we can override {@link #newInstance} and allocate a
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27 * {@link RubyRegexp} rather than a normal {@link RubyBasicObject}.
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28 */
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29 public static class RubyRegexpClass extends RubyClass {
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30
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31 public RubyRegexpClass(RubyClass objectClass) {
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32 super(null, objectClass, "Regexp");
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33 }
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34
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35 @Override
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36 public RubyBasicObject newInstance() {
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37 return new RubyRegexp(getContext().getCoreLibrary().getRegexpClass());
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38 }
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39
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40 }
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41
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42 @CompilationFinal private Pattern pattern;
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43
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44 public RubyRegexp(RubyClass regexpClass) {
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45 super(regexpClass);
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46 }
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47
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48 public RubyRegexp(RubyClass regexpClass, String pattern) {
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49 this(regexpClass);
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50 initialize(compile(pattern));
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51 }
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52
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53 public RubyRegexp(RubyClass regexpClass, Pattern pattern) {
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54 this(regexpClass);
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55 initialize(pattern);
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56 }
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57
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58 public void initialize(String setPattern) {
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59 pattern = compile(setPattern);
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60 }
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61
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62 public void initialize(Pattern setPattern) {
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63 pattern = setPattern;
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64 }
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65
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66 public Object matchOperator(Frame frame, String string) {
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67 final RubyContext context = getRubyClass().getContext();
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68
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69 final Matcher matcher = pattern.matcher(string);
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70
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71 if (matcher.find()) {
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72 for (int n = 1; n < matcher.groupCount() + 1; n++) {
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73 final FrameSlot slot = frame.getFrameDescriptor().findFrameSlot("$" + n);
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74
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75 if (slot != null) {
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76 frame.setObject(slot, context.makeString(matcher.group(n)));
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77 }
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78 }
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79
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80 return matcher.start();
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81 } else {
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82 return NilPlaceholder.INSTANCE;
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83 }
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84 }
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85
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86 public Pattern getPattern() {
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87 return pattern;
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88 }
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89
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90 public Object match(String string) {
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91 final RubyContext context = getRubyClass().getContext();
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92
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93 final Matcher matcher = pattern.matcher(string);
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94
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95 if (!matcher.find()) {
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96 return NilPlaceholder.INSTANCE;
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97 }
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98
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99 final Object[] values = new Object[matcher.groupCount() + 1];
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100
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101 for (int n = 0; n < matcher.groupCount() + 1; n++) {
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102 final String group = matcher.group(n);
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103
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104 if (group == null) {
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105 values[n] = NilPlaceholder.INSTANCE;
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106 } else {
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107 values[n] = context.makeString(group);
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108 }
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109 }
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110
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111 return new RubyMatchData(context.getCoreLibrary().getMatchDataClass(), values);
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112 }
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113
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114 @Override
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115 public int hashCode() {
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116 return pattern.pattern().hashCode();
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117 }
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118
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119 @Override
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120 public boolean equals(Object obj) {
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121 if (this == obj) {
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122 return true;
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123 }
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124 if (obj == null) {
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125 return false;
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126 }
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127 if (!(obj instanceof RubyRegexp)) {
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128 return false;
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129 }
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130 RubyRegexp other = (RubyRegexp) obj;
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131 if (pattern == null) {
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132 if (other.pattern != null) {
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133 return false;
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134 }
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135 } else if (!pattern.pattern().equals(other.pattern.pattern())) {
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136 return false;
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137 }
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138 return true;
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139 }
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140
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141 public static Pattern compile(String pattern) {
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142 return Pattern.compile(pattern, Pattern.MULTILINE | Pattern.UNIX_LINES);
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143 }
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144 }
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