Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/source/Source.java @ 16989:19faa7ca37c1
Truffle/Source: use a synchronized hash table
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Wed, 27 Aug 2014 17:59:48 -0700 |
parents | 7109baa7b9eb |
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1 /* |
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2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package com.oracle.truffle.api.source; |
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26 |
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27 import java.io.*; |
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28 import java.lang.ref.*; |
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29 import java.net.*; |
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30 import java.util.*; |
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31 |
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32 /** |
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33 * Representation of a guest language source code unit and its contents. Sources originate in |
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34 * several ways: |
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35 * <ul> |
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36 * <li><strong>Literal:</strong> A named text string. These are not indexed and should be considered |
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37 * value objects; equality is defined based on contents. <br> |
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38 * See {@link Source#fromText(String, String)}</li> |
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39 * <p> |
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40 * <li><strong>File:</strong> Each file is represented as a canonical object, indexed by the |
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41 * absolute, canonical path name of the file. File contents are <em>read lazily</em> and contents |
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42 * optionally <em>cached</em>. <br> |
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43 * See {@link Source#fromFileName(String)}<br> |
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44 * See {@link Source#fromFileName(String, boolean)}</li> |
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45 * <p> |
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46 * <li><strong>URL:</strong> Each URL source is represented as a canonical object, indexed by the |
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47 * URL. Contents are <em>read eagerly</em> and <em>cached</em>. <br> |
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48 * See {@link Source#fromURL(URL, String)}</li> |
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49 * <p> |
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50 * <li><strong>Reader:</strong> Contents are <em>read eagerly</em> and treated as a <em>Literal</em> |
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51 * . <br> |
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52 * See {@link Source#fromReader(Reader, String)}</li> |
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53 * <p> |
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54 * <li><strong>Pseudo File:</strong> A literal text string that can be retrieved by name as if it |
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55 * were a file, unlike literal sources; useful for testing. <br> |
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56 * See {@link Source#asPseudoFile(String, String)}</li> |
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57 * </ul> |
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58 * <p> |
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59 * <strong>File cache:</strong> |
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60 * <ol> |
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61 * <li>File content caching is optional, <em>off</em> by default.</li> |
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62 * <li>The first access to source file contents will result in the contents being read, and (if |
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63 * enabled) cached.</li> |
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64 * <li>If file contents have been cached, access to contents via {@link Source#getInputStream()} or |
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65 * {@link Source#getReader()} will be provided from the cache.</li> |
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66 * <li>Any access to file contents via the cache will result in a timestamp check and possible cache |
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67 * reload.</li> |
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68 * </ol> |
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69 */ |
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70 public abstract class Source { |
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71 |
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72 // TODO (mlvdv) consider canonicalizing and reusing SourceSection instances |
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73 // TOOD (mlvdv) connect SourceSections into a spatial tree for fast geometric lookup |
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74 |
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75 // Files and pseudo files are indexed. |
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76 private static final Map<String, WeakReference<Source>> filePathToSource = new Hashtable<>(); |
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77 |
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78 private static boolean fileCacheEnabled = true; |
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79 |
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80 /** |
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81 * Gets the canonical representation of a source file, whose contents will be read lazily and |
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82 * then cached. |
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83 * |
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84 * @param fileName name |
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85 * @param reset forces any existing {@link Source} cache to be cleared, forcing a re-read |
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86 * @return canonical representation of the file's contents. |
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87 * @throws IOException if the file can not be read |
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88 */ |
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89 public static Source fromFileName(String fileName, boolean reset) throws IOException { |
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90 |
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91 final WeakReference<Source> nameRef = filePathToSource.get(fileName); |
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92 Source source = nameRef == null ? null : nameRef.get(); |
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93 if (source == null) { |
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94 final File file = new File(fileName); |
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95 if (!file.canRead()) { |
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96 throw new IOException("Can't read file " + fileName); |
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97 } |
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98 final String path = file.getCanonicalPath(); |
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99 final WeakReference<Source> pathRef = filePathToSource.get(path); |
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100 source = pathRef == null ? null : pathRef.get(); |
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101 if (source == null) { |
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102 source = new FileSource(file, fileName, path); |
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103 filePathToSource.put(path, new WeakReference<>(source)); |
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104 } |
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105 } |
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106 if (reset) { |
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107 source.reset(); |
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108 } |
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109 return source; |
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110 } |
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111 |
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112 /** |
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113 * Gets the canonical representation of a source file, whose contents will be read lazily and |
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114 * then cached. |
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115 * |
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116 * @param fileName name |
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117 * @return canonical representation of the file's contents. |
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118 * @throws IOException if the file can not be read |
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119 */ |
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120 public static Source fromFileName(String fileName) throws IOException { |
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121 return fromFileName(fileName, false); |
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122 } |
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123 |
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124 /** |
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125 * Creates a non-canonical source from literal text. |
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126 * |
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127 * @param code textual source code |
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128 * @param description a note about the origin, for error messages and debugging |
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129 * @return a newly created, non-indexed source representation |
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130 */ |
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131 public static Source fromText(String code, String description) { |
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132 assert code != null; |
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133 return new LiteralSource(description, code); |
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134 } |
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135 |
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136 /** |
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137 * Creates a source whose contents will be read immediately from a URL and cached. |
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138 * |
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139 * @param url |
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140 * @param name identifies the origin, possibly useful for debugging |
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141 * @return a newly created, non-indexed source representation |
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142 * @throws IOException if reading fails |
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143 */ |
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144 public static Source fromURL(URL url, String name) throws IOException { |
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145 return URLSource.get(url, name); |
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146 } |
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147 |
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148 /** |
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149 * Creates a source whose contents will be read immediately and cached. |
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150 * |
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151 * @param reader |
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152 * @param description a note about the origin, possibly useful for debugging |
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153 * @return a newly created, non-indexed source representation |
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154 * @throws IOException if reading fails |
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155 */ |
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156 public static Source fromReader(Reader reader, String description) throws IOException { |
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157 return new LiteralSource(description, read(reader)); |
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158 } |
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159 |
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160 /** |
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161 * Creates a source from literal text, but which acts as a file and can be retrieved by name |
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162 * (unlike other literal sources); intended for testing. |
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163 * |
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164 * @param code textual source code |
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165 * @param pseudoFileName string to use for indexing/lookup |
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166 * @return a newly created, source representation, canonical with respect to its name |
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167 */ |
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168 public static Source asPseudoFile(String code, String pseudoFileName) { |
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169 final Source source = new LiteralSource(pseudoFileName, code); |
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170 filePathToSource.put(pseudoFileName, new WeakReference<>(source)); |
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171 return source; |
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172 } |
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173 |
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174 // TODO (mlvdv) enable per-file choice whether to cache? |
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175 /** |
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176 * Enables/disables caching of file contents, <em>disabled</em> by default. Caching of sources |
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177 * created from literal text or readers is always enabled. |
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178 */ |
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179 public static void setFileCaching(boolean enabled) { |
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180 fileCacheEnabled = enabled; |
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181 } |
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182 |
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183 private static String read(Reader reader) throws IOException { |
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184 final StringBuilder builder = new StringBuilder(); |
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185 final char[] buffer = new char[1024]; |
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186 |
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187 while (true) { |
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188 final int n = reader.read(buffer); |
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189 if (n == -1) { |
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190 break; |
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191 } |
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192 builder.append(buffer, 0, n); |
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193 } |
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194 |
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195 return builder.toString(); |
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196 } |
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197 |
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198 Source() { |
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199 } |
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200 |
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201 private TextMap textMap = null; |
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202 |
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203 protected abstract void reset(); |
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204 |
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205 /** |
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206 * Returns the name of this resource holding a guest language program. An example would be the |
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207 * name of a guest language source code file. |
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208 * |
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209 * @return the name of the guest language program |
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210 */ |
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211 public abstract String getName(); |
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212 |
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213 /** |
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214 * Returns a short version of the name of the resource holding a guest language program (as |
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215 * described in @getName). For example, this could be just the name of the file, rather than a |
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216 * full path. |
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217 * |
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218 * @return the short name of the guest language program |
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219 */ |
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220 public abstract String getShortName(); |
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221 |
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222 /** |
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223 * The normalized, canonical name if the source is a file. |
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224 */ |
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225 public abstract String getPath(); |
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226 |
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227 /** |
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228 * The URL if the source is retrieved via URL. |
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229 */ |
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230 public abstract URL getURL(); |
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231 |
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232 /** |
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233 * Access to the source contents. |
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234 */ |
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235 public abstract Reader getReader(); |
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236 |
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237 /** |
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238 * Access to the source contents. |
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239 */ |
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240 public final InputStream getInputStream() { |
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241 return new ByteArrayInputStream(getCode().getBytes()); |
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242 } |
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243 |
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244 /** |
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245 * Return the complete text of the code. |
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246 */ |
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247 public abstract String getCode(); |
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248 |
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249 /** |
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250 * Gets the text (not including a possible terminating newline) in a (1-based) numbered line. |
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251 */ |
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252 public final String getCode(int lineNumber) { |
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253 checkTextMap(); |
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254 final int offset = textMap.lineStartOffset(lineNumber); |
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255 final int length = textMap.lineLength(lineNumber); |
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256 return getCode().substring(offset, offset + length); |
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257 } |
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258 |
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259 /** |
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260 * The number of text lines in the source, including empty lines; characters at the end of the |
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261 * source without a terminating newline count as a line. |
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262 */ |
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263 public final int getLineCount() { |
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264 return checkTextMap().lineCount(); |
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265 } |
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266 |
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267 /** |
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268 * Given a 0-based character offset, return the 1-based number of the line that includes the |
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269 * position. |
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270 * |
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271 * @throws IllegalArgumentException if the offset is outside the text contents |
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272 */ |
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273 public final int getLineNumber(int offset) throws IllegalArgumentException { |
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274 return checkTextMap().offsetToLine(offset); |
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275 } |
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276 |
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277 /** |
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278 * Given a 0-based character offset, return the 1-based number of the column at the position. |
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279 * |
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280 * @throws IllegalArgumentException if the offset is outside the text contents |
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281 */ |
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282 public final int getColumnNumber(int offset) throws IllegalArgumentException { |
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283 return checkTextMap().offsetToCol(offset); |
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284 } |
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285 |
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286 /** |
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287 * Given a 1-based line number, return the 0-based offset of the first character in the line. |
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288 * |
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289 * @throws IllegalArgumentException if there is no such line in the text |
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290 */ |
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291 public final int getLineStartOffset(int lineNumber) throws IllegalArgumentException { |
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292 return checkTextMap().lineStartOffset(lineNumber); |
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293 } |
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294 |
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295 /** |
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296 * The number of characters (not counting a possible terminating newline) in a (1-based) |
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297 * numbered line. |
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298 * |
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299 * @throws IllegalArgumentException if there is no such line in the text |
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300 */ |
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301 public final int getLineLength(int lineNumber) throws IllegalArgumentException { |
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302 return checkTextMap().lineLength(lineNumber); |
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303 } |
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304 |
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305 /** |
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306 * Creates a representation of a contiguous region of text in the source. |
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307 * <p> |
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308 * This method performs no checks on the validity of the arguments. |
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309 * <p> |
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310 * The resulting representation defines hash/equality around equivalent location, presuming that |
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311 * {@link Source} representations are canonical. |
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312 * |
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313 * @param identifier terse description of the region |
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314 * @param startLine 1-based line number of the first character in the section |
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315 * @param startColumn 1-based column number of the first character in the section |
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316 * @param charIndex the 0-based index of the first character of the section |
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317 * @param length the number of characters in the section |
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318 * @return newly created object representing the specified region |
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319 */ |
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320 public final SourceSection createSection(String identifier, int startLine, int startColumn, int charIndex, int length) { |
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321 return new DefaultSourceSection(this, identifier, startLine, startColumn, charIndex, length); |
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322 } |
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323 |
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324 /** |
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325 * Creates a representation of a contiguous region of text in the source. Computes the |
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326 * {@code charIndex} value by building a {@linkplain TextMap map} of lines in the source. |
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327 * <p> |
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328 * Checks the position arguments for consistency with the source. |
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329 * <p> |
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330 * The resulting representation defines hash/equality around equivalent location, presuming that |
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331 * {@link Source} representations are canonical. |
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332 * |
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333 * @param identifier terse description of the region |
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334 * @param startLine 1-based line number of the first character in the section |
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335 * @param startColumn 1-based column number of the first character in the section |
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336 * @param length the number of characters in the section |
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337 * @return newly created object representing the specified region |
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338 * @throws IllegalArgumentException if arguments are outside the text of the source |
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339 * @throws IllegalStateException if the source is one of the "null" instances |
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340 */ |
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341 public final SourceSection createSection(String identifier, int startLine, int startColumn, int length) { |
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342 checkTextMap(); |
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343 final int lineStartOffset = textMap.lineStartOffset(startLine); |
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344 if (startColumn > textMap.lineLength(startLine)) { |
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345 throw new IllegalArgumentException("column out of range"); |
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346 } |
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347 final int startOffset = lineStartOffset + startColumn - 1; |
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348 return new DefaultSourceSection(this, identifier, startLine, startColumn, startOffset, length); |
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349 } |
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350 |
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351 /** |
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352 * Creates a representation of a contiguous region of text in the source. Computes the |
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353 * {@code (startLine, startColumn)} values by building a {@linkplain TextMap map} of lines in |
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354 * the source. |
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355 * <p> |
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356 * Checks the position arguments for consistency with the source. |
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357 * <p> |
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358 * The resulting representation defines hash/equality around equivalent location, presuming that |
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359 * {@link Source} representations are canonical. |
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360 * |
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361 * |
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362 * @param identifier terse description of the region |
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363 * @param charIndex 0-based position of the first character in the section |
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364 * @param length the number of characters in the section |
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365 * @return newly created object representing the specified region |
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366 * @throws IllegalArgumentException if either of the arguments are outside the text of the |
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367 * source |
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368 * @throws IllegalStateException if the source is one of the "null" instances |
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369 */ |
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370 public final SourceSection createSection(String identifier, int charIndex, int length) throws IllegalArgumentException { |
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371 final int codeLength = getCode().length(); |
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372 if (!(charIndex >= 0 && length >= 0 && charIndex + length <= codeLength)) { |
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373 throw new IllegalArgumentException("text positions out of range"); |
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374 } |
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375 checkTextMap(); |
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376 final int startLine = getLineNumber(charIndex); |
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377 final int startColumn = charIndex - getLineStartOffset(startLine) + 1; |
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378 |
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379 return new DefaultSourceSection(this, identifier, startLine, startColumn, charIndex, length); |
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380 } |
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381 |
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382 /** |
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383 * Creates a representation of a line of text in the source identified only by line number, from |
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384 * which the character information will be computed. |
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385 * |
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386 * @param identifier terse description of the line |
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387 * @param lineNumber 1-based line number of the first character in the section |
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388 * @return newly created object representing the specified line |
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389 * @throws IllegalArgumentException if the line does not exist the source |
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390 * @throws IllegalStateException if the source is one of the "null" instances |
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391 */ |
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392 public final SourceSection createSection(String identifier, int lineNumber) { |
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393 checkTextMap(); |
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394 final int charIndex = textMap.lineStartOffset(lineNumber); |
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395 final int length = textMap.lineLength(lineNumber); |
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396 return createSection(identifier, charIndex, length); |
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397 } |
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398 |
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399 /** |
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400 * Creates a representation of a line number in this source, suitable for use as a hash table |
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401 * key with equality defined to mean equivalent location. |
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402 * |
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403 * @param lineNumber a 1-based line number in this source |
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404 * @return a representation of a line in this source |
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405 */ |
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406 public final LineLocation createLineLocation(int lineNumber) { |
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407 return new LineLocationImpl(this, lineNumber); |
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408 } |
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409 |
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410 private TextMap checkTextMap() { |
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411 if (textMap == null) { |
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412 final String code = getCode(); |
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413 if (code == null) { |
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414 throw new RuntimeException("can't read file " + getName()); |
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415 } |
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416 textMap = new TextMap(code); |
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417 } |
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418 return textMap; |
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419 } |
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420 |
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421 private static final class LiteralSource extends Source { |
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422 |
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423 private final String name; // Name used originally to describe the source |
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424 private final String code; |
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425 |
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426 public LiteralSource(String name, String code) { |
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427 this.name = name; |
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428 this.code = code; |
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429 } |
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430 |
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431 @Override |
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432 public String getName() { |
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433 return name; |
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434 } |
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435 |
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436 @Override |
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437 public String getShortName() { |
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438 return name; |
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439 } |
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440 |
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441 @Override |
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442 public String getCode() { |
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443 return code; |
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444 } |
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445 |
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446 @Override |
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447 public String getPath() { |
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448 return name; |
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449 } |
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450 |
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451 @Override |
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452 public URL getURL() { |
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453 return null; |
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454 } |
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455 |
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456 @Override |
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457 public Reader getReader() { |
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458 return new StringReader(code); |
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459 } |
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460 |
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461 @Override |
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462 protected void reset() { |
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463 } |
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464 |
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465 @Override |
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466 public int hashCode() { |
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467 final int prime = 31; |
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468 int result = 1; |
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469 result = prime * result + name.hashCode(); |
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470 result = prime * result + (code == null ? 0 : code.hashCode()); |
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471 return result; |
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472 } |
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473 |
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474 @Override |
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475 public boolean equals(Object obj) { |
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476 if (this == obj) { |
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477 return true; |
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478 } |
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479 if (obj == null) { |
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480 return false; |
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481 } |
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482 if (!(obj instanceof LiteralSource)) { |
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483 return false; |
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484 } |
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485 LiteralSource other = (LiteralSource) obj; |
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486 return name.equals(other.name) && code.equals(other.code); |
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487 } |
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488 |
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489 } |
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490 |
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491 private static final class FileSource extends Source { |
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492 |
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493 private final File file; |
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494 private final String name; // Name used originally to describe the source |
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495 private final String path; // Normalized path description of an actual file |
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496 |
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497 private String code = null; // A cache of the file's contents |
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498 private long timeStamp; // timestamp of the cache in the file system |
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499 |
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500 public FileSource(File file, String name, String path) { |
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501 this.file = file; |
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502 this.name = name; |
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503 this.path = path; |
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504 } |
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505 |
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506 @Override |
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507 public String getName() { |
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508 return name; |
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509 } |
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510 |
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511 @Override |
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512 public String getShortName() { |
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513 return file.getName(); |
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514 } |
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515 |
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516 @Override |
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517 public String getCode() { |
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518 if (fileCacheEnabled) { |
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519 if (code == null || timeStamp != file.lastModified()) { |
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520 try { |
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521 code = read(getReader()); |
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522 timeStamp = file.lastModified(); |
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523 } catch (IOException e) { |
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524 } |
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|
525 } |
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526 return code; |
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|
527 } |
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528 try { |
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529 return read(new FileReader(file)); |
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530 } catch (IOException e) { |
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531 } |
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|
532 return null; |
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|
533 } |
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534 |
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|
535 @Override |
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536 public String getPath() { |
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537 return path; |
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|
538 } |
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|
539 |
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|
540 @Override |
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541 public URL getURL() { |
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542 return null; |
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|
543 } |
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544 |
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545 @Override |
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546 public Reader getReader() { |
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547 if (code != null && timeStamp == file.lastModified()) { |
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548 return new StringReader(code); |
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549 } |
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550 try { |
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551 return new FileReader(file); |
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552 } catch (FileNotFoundException e) { |
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553 throw new RuntimeException("Can't find file " + path); |
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554 } |
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|
555 } |
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|
556 |
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557 @Override |
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558 protected void reset() { |
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559 this.code = null; |
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560 } |
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|
561 |
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562 } |
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|
563 |
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564 private static final class URLSource extends Source { |
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|
565 |
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566 private static final Map<URL, WeakReference<URLSource>> urlToSource = new HashMap<>(); |
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|
567 |
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|
568 public static URLSource get(URL url, String name) throws IOException { |
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|
569 WeakReference<URLSource> sourceRef = urlToSource.get(url); |
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570 URLSource source = sourceRef == null ? null : sourceRef.get(); |
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571 if (source == null) { |
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572 source = new URLSource(url, name); |
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573 urlToSource.put(url, new WeakReference<>(source)); |
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574 } |
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|
575 return source; |
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|
576 } |
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|
577 |
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|
578 private final URL url; |
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579 private final String name; |
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580 private String code = null; // A cache of the source contents |
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|
581 |
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|
582 public URLSource(URL url, String name) throws IOException { |
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583 this.url = url; |
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584 this.name = name; |
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|
585 code = read(new InputStreamReader(url.openStream())); |
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|
586 } |
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|
587 |
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|
588 @Override |
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|
589 public String getName() { |
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|
590 return name; |
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|
591 } |
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|
592 |
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diff
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|
593 @Override |
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|
594 public String getShortName() { |
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|
595 return name; |
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parents:
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|
596 } |
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|
597 |
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|
598 @Override |
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|
599 public String getPath() { |
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|
600 return url.getPath(); |
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|
601 } |
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|
602 |
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|
603 @Override |
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changeset
|
604 public URL getURL() { |
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605 return url; |
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|
606 } |
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607 |
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608 @Override |
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609 public Reader getReader() { |
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610 return new StringReader(code); |
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|
611 } |
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|
612 |
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|
613 @Override |
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|
614 public String getCode() { |
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|
615 return code; |
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|
616 } |
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|
617 |
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|
618 @Override |
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|
619 protected void reset() { |
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|
620 } |
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|
621 |
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|
622 } |
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|
623 |
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624 private static final class DefaultSourceSection implements SourceSection { |
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|
625 |
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626 private final Source source; |
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627 private final String identifier; |
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628 private final int startLine; |
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629 private final int startColumn; |
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630 private final int charIndex; |
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631 private final int charLength; |
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|
632 |
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|
633 /** |
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634 * Creates a new object representing a contiguous text section within the source code of a |
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635 * guest language program's text. |
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|
636 * <p> |
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|
637 * The starting location of the section is specified using two different coordinate: |
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|
638 * <ul> |
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|
639 * <li><b>(row, column)</b>: rows and columns are 1-based, so the first character in a |
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640 * source file is at position {@code (1,1)}.</li> |
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641 * <li><b>character index</b>: 0-based offset of the character from the beginning of the |
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642 * source, so the first character in a file is at index {@code 0}.</li> |
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|
643 * </ul> |
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|
644 * The <b>newline</b> that terminates each line counts as a single character for the purpose |
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645 * of a character index. The (row,column) coordinates of a newline character should never |
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646 * appear in a text section. |
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|
647 * <p> |
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|
648 * |
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|
649 * @param source object representing the complete source program that contains this section |
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650 * @param identifier an identifier used when printing the section |
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parents:
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|
651 * @param startLine the 1-based number of the start line of the section |
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|
652 * @param startColumn the 1-based number of the start column of the section |
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|
653 * @param charIndex the 0-based index of the first character of the section |
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|
654 * @param charLength the length of the section in number of characters |
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655 */ |
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|
656 public DefaultSourceSection(Source source, String identifier, int startLine, int startColumn, int charIndex, int charLength) { |
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|
657 this.source = source; |
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|
658 this.identifier = identifier; |
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659 this.startLine = startLine; |
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660 this.startColumn = startColumn; |
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661 this.charIndex = charIndex; |
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662 this.charLength = charLength; |
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|
663 } |
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|
664 |
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665 @Override |
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666 public final Source getSource() { |
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|
667 return source; |
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|
668 } |
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|
669 |
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|
670 @Override |
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671 public final int getStartLine() { |
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672 return startLine; |
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|
673 } |
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|
674 |
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|
675 @Override |
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676 public final LineLocation getLineLocation() { |
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677 return source.createLineLocation(startLine); |
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|
678 } |
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|
679 |
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680 @Override |
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681 public final int getStartColumn() { |
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682 return startColumn; |
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|
683 } |
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|
684 |
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|
685 @Override |
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686 public final int getCharIndex() { |
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687 return charIndex; |
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|
688 } |
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689 |
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690 @Override |
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691 public final int getCharLength() { |
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692 return charLength; |
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|
693 } |
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|
694 |
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695 @Override |
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696 public final int getCharEndIndex() { |
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697 return charIndex + charLength; |
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|
698 } |
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|
699 |
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|
700 @Override |
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701 public final String getIdentifier() { |
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|
702 return identifier; |
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|
703 } |
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|
704 |
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|
705 @Override |
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706 public final String getCode() { |
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707 return getSource().getCode().substring(charIndex, charIndex + charLength); |
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|
708 } |
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|
709 |
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|
710 @Override |
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|
711 public final String getShortDescription() { |
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|
712 return String.format("%s:%d", source.getShortName(), startLine); |
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|
713 } |
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|
714 |
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|
715 @Override |
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|
716 public String toString() { |
16140
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717 return getCode(); |
16068
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|
718 } |
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|
719 |
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|
720 @Override |
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|
721 public int hashCode() { |
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|
722 final int prime = 31; |
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|
723 int result = 1; |
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|
724 result = prime * result + charIndex; |
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|
725 result = prime * result + charLength; |
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|
726 result = prime * result + ((identifier == null) ? 0 : identifier.hashCode()); |
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|
727 result = prime * result + ((source == null) ? 0 : source.hashCode()); |
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|
728 result = prime * result + startColumn; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
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diff
changeset
|
729 result = prime * result + startLine; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
730 return result; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
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|
731 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
732 |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
733 @Override |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
734 public boolean equals(Object obj) { |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
735 if (this == obj) { |
74e142bd2b12
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
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|
736 return true; |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
737 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
738 if (obj == null) { |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
739 return false; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
740 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
741 if (!(obj instanceof DefaultSourceSection)) { |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
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|
742 return false; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
743 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
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|
744 DefaultSourceSection other = (DefaultSourceSection) obj; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
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|
745 if (charIndex != other.charIndex) { |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
746 return false; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
747 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
748 if (charLength != other.charLength) { |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
749 return false; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
750 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
751 if (identifier == null) { |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
752 if (other.identifier != null) { |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
753 return false; |
74e142bd2b12
Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
754 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
755 } else if (!identifier.equals(other.identifier)) { |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
756 return false; |
74e142bd2b12
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
757 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
758 if (source == null) { |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
759 if (other.source != null) { |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
760 return false; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
761 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
762 } else if (!source.equals(other.source)) { |
74e142bd2b12
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
763 return false; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
764 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
765 if (startColumn != other.startColumn) { |
74e142bd2b12
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
766 return false; |
74e142bd2b12
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
767 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
768 if (startLine != other.startLine) { |
74e142bd2b12
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
769 return false; |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
770 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
771 return true; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
772 } |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
773 |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
774 } |
74e142bd2b12
Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
775 |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
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|
776 private static final class LineLocationImpl implements LineLocation { |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
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|
777 private final Source source; |
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parents:
diff
changeset
|
778 private final int line; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
779 |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
780 public LineLocationImpl(Source source, int line) { |
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parents:
diff
changeset
|
781 assert source != null; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
782 this.source = source; |
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parents:
diff
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|
783 this.line = line; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
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|
784 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
785 |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
786 @Override |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
787 public Source getSource() { |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
788 return source; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
789 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
790 |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
791 @Override |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
792 public int getLineNumber() { |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
793 return line; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
794 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
795 |
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parents:
diff
changeset
|
796 @Override |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
797 public String toString() { |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
798 return "SourceLine [" + source.getName() + ", " + line + "]"; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
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diff
changeset
|
799 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
800 |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
801 @Override |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
802 public int hashCode() { |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
803 final int prime = 31; |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
804 int result = 1; |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
805 result = prime * result + line; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
806 result = prime * result + source.hashCode(); |
74e142bd2b12
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
807 return result; |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
808 } |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
809 |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
810 @Override |
74e142bd2b12
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
811 public boolean equals(Object obj) { |
74e142bd2b12
Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
812 if (this == obj) { |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
813 return true; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
814 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
815 if (obj == null) { |
74e142bd2b12
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
816 return false; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
817 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
818 if (!(obj instanceof LineLocationImpl)) { |
74e142bd2b12
Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
819 return false; |
74e142bd2b12
Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
820 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
821 LineLocationImpl other = (LineLocationImpl) obj; |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
822 if (line != other.line) { |
74e142bd2b12
Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
823 return false; |
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Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
824 } |
74e142bd2b12
Truffle/Source: major API revision
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
825 return source.equals(other.source); |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
826 } |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
827 |
16130
6f7d3f3703d3
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parents:
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diff
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|
828 } |
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|
829 |
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|
830 /** |
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parents:
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diff
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|
831 * A utility for converting between coordinate systems in a string of text interspersed with |
6f7d3f3703d3
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parents:
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diff
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|
832 * newline characters. The coordinate systems are: |
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parents:
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diff
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|
833 * <ul> |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
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diff
changeset
|
834 * <li>0-based character offset from the beginning of the text, where newline characters count |
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parents:
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diff
changeset
|
835 * as a single character and the first character in the text occupies position 0.</li> |
6f7d3f3703d3
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diff
changeset
|
836 * <li>1-based position in the 2D space of lines and columns, in which the first position in the |
6f7d3f3703d3
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
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diff
changeset
|
837 * text is at (1,1).</li> |
6f7d3f3703d3
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parents:
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diff
changeset
|
838 * </ul> |
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parents:
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diff
changeset
|
839 * <p> |
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parents:
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diff
changeset
|
840 * This utility is based on positions occupied by characters, not text stream positions as in a |
6f7d3f3703d3
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parents:
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diff
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|
841 * text editor. The distinction shows up in editors where you can put the cursor just past the |
6f7d3f3703d3
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
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diff
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|
842 * last character in a buffer; this is necessary, among other reasons, so that you can put the |
6f7d3f3703d3
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
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diff
changeset
|
843 * edit cursor in a new (empty) buffer. For the purposes of this utility, however, there are no |
6f7d3f3703d3
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parents:
16068
diff
changeset
|
844 * character positions in an empty text string and there are no lines in an empty text string. |
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
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diff
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|
845 * <p> |
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parents:
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diff
changeset
|
846 * A newline character designates the end of a line and occupies a column position. |
6f7d3f3703d3
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parents:
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diff
changeset
|
847 * <p> |
6f7d3f3703d3
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parents:
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diff
changeset
|
848 * If the text ends with a character other than a newline, then the characters following the |
6f7d3f3703d3
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Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
16068
diff
changeset
|
849 * final newline character count as a line, even though not newline-terminated. |
6f7d3f3703d3
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parents:
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850 * <p> |
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851 * <strong>Limitations:</strong> |
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852 * <ul> |
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853 * <li>Does not handle multiple character encodings correctly.</li> |
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854 * <li>Treats tabs as occupying 1 column.</li> |
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855 * <li>Does not handle multiple-character line termination sequences correctly.</li> |
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856 * </ul> |
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857 */ |
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858 private static final class TextMap { |
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859 |
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|
860 // 0-based offsets of newline characters in the text, with sentinel |
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861 private final int[] nlOffsets; |
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862 |
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|
863 // The number of characters in the text, including newlines (which count as 1). |
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864 private final int textLength; |
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865 |
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866 // Is the final text character a newline? |
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867 final boolean finalNL; |
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868 |
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869 /** |
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870 * Constructs map permitting translation between 0-based character offsets and 1-based |
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|
871 * lines/columns. |
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|
872 */ |
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873 public TextMap(String text) { |
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874 this.textLength = text.length(); |
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875 final ArrayList<Integer> lines = new ArrayList<>(); |
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876 lines.add(0); |
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877 int offset = 0; |
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|
878 |
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879 while (offset < text.length()) { |
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880 final int nlIndex = text.indexOf('\n', offset); |
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881 if (nlIndex >= 0) { |
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882 offset = nlIndex + 1; |
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883 lines.add(offset); |
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884 } else { |
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|
885 break; |
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|
886 } |
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|
887 } |
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|
888 lines.add(Integer.MAX_VALUE); |
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|
889 |
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890 nlOffsets = new int[lines.size()]; |
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891 for (int line = 0; line < lines.size(); line++) { |
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892 nlOffsets[line] = lines.get(line); |
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893 } |
16130
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|
894 |
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|
895 finalNL = textLength > 0 && (textLength == nlOffsets[nlOffsets.length - 2]); |
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896 } |
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|
897 |
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|
898 /** |
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|
899 * Converts 0-based character offset to 1-based number of the line containing the character. |
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900 * |
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|
901 * @throws IllegalArgumentException if the offset is outside the string. |
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|
902 */ |
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903 public int offsetToLine(int offset) throws IllegalArgumentException { |
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|
904 if (offset < 0 || offset >= textLength) { |
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|
905 throw new IllegalArgumentException("offset out of bounds"); |
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|
906 } |
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|
907 int line = 1; |
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|
908 while (offset >= nlOffsets[line]) { |
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|
909 line++; |
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|
910 } |
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911 return line; |
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|
912 } |
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913 |
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|
914 /** |
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|
915 * Converts 0-based character offset to 1-based number of the column occupied by the |
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916 * character. |
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|
917 * <p> |
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|
918 * Tabs are not expanded; they occupy 1 column. |
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|
919 * |
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|
920 * @throws IllegalArgumentException if the offset is outside the string. |
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921 */ |
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|
922 public int offsetToCol(int offset) throws IllegalArgumentException { |
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923 return 1 + offset - nlOffsets[offsetToLine(offset) - 1]; |
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924 } |
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|
925 |
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|
926 /** |
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927 * The number of lines in the text; if characters appear after the final newline, then they |
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928 * also count as a line, even though not newline-terminated. |
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929 */ |
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|
930 public int lineCount() { |
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|
931 if (textLength == 0) { |
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|
932 return 0; |
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933 } |
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|
934 return finalNL ? nlOffsets.length - 2 : nlOffsets.length - 1; |
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935 } |
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|
936 |
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|
937 /** |
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|
938 * Converts 1-based line number to the 0-based offset of the line's first character; this |
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|
939 * would be the offset of a newline if the line is empty. |
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|
940 * |
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941 * @throws IllegalArgumentException if there is no such line in the text. |
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942 */ |
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|
943 public int lineStartOffset(int line) throws IllegalArgumentException { |
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944 if (textLength == 0 || lineOutOfRange(line)) { |
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|
945 throw new IllegalArgumentException("line out of bounds"); |
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946 } |
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|
947 return nlOffsets[line - 1]; |
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948 } |
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|
949 |
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|
950 /** |
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|
951 * Gets the number of characters in a line, identified by 1-based line number; |
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|
952 * <em>does not</em> include the final newline, if any. |
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|
953 * |
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|
954 * @throws IllegalArgumentException if there is no such line in the text. |
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|
955 */ |
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|
956 public int lineLength(int line) throws IllegalArgumentException { |
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|
957 if (textLength == 0 || lineOutOfRange(line)) { |
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|
958 throw new IllegalArgumentException("line out of bounds"); |
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|
959 } |
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|
960 if (line == nlOffsets.length - 1 && !finalNL) { |
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|
961 return textLength - nlOffsets[line - 1]; |
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962 } |
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|
963 return (nlOffsets[line] - nlOffsets[line - 1]) - 1; |
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964 |
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965 } |
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966 |
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967 /** |
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968 * Is the line number out of range. |
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969 */ |
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970 private boolean lineOutOfRange(int line) { |
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971 return line <= 0 || line >= nlOffsets.length || (line == nlOffsets.length - 1 && finalNL); |
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972 } |
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973 |
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974 } |
16130
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975 |
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976 } |