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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/source/SourceManager.java @ 13455:69d2e4baa215

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Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Tue, 17 Dec 2013 20:22:45 -0800
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children f76593e3fedb
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69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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4 *
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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5 * This code is free software; you can redistribute it and/or modify it
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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6 * under the terms of the GNU General Public License version 2 only, as
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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7 * published by the Free Software Foundation. Oracle designates this
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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8 * particular file as subject to the "Classpath" exception as provided
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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9 * by Oracle in the LICENSE file that accompanied this code.
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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14 * version 2 for more details (a copy is included in the LICENSE file that
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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15 * accompanied this code).
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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16 *
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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17 * You should have received a copy of the GNU General Public License version
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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18 * 2 along with this work; if not, write to the Free Software Foundation,
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
69d2e4baa215 Truffle: new infrastructure related to instrumentation, and in particular debugging: support for managing Source objects; framework for generalized "instrumentation proxy nodes" (to be inserted into ASTs with no runtime cost when inactive), and "probes" (which can be attached to proxy nodes to receive event notification); a rudimentary interface and abstract implementation for a "debug manager" (mostly a placeholder at this point); and the beginning of a language-agnostic ExecutionContext interface.
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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.util.*;
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29
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30 import com.oracle.truffle.api.*;
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31
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32 /**
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33 * A representation of source code information, suitable for hash table keys with equality defined
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34 * in terms of content. There are three kinds of sources supported at present.
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35 * <ul>
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36 * <li><strong>File:</strong>Each file is represented as a canonical object, indexed by the
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37 * absolute, canonical path name of the file. The textual contents of the file may be supplied when
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38 * the object is created, or it may be read lazily. Only one lazy attempt will be made to read a
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39 * file, and failure will result silently in null content.</li>
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40 * <li><strong>Literal Source:</strong> A named text string, whose contents are supplied concretely
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41 * (possibly via an {@link InputStream}), can also be used as a source. These are represented as
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42 * value objects whose equality depends on both name and contents.</li>
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43 * <li><strong>Fake Files:</strong> A named text string used for testing; its contents can be
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44 * retrieved by name, unlike literal sources.</li>
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45 * </ul>
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46 */
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47 public final class SourceManager {
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48
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49 // Only files and fake files are indexed.
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50 private final Map<String, SourceImpl> sourceMap = new HashMap<>();
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51
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52 public SourceManager() {
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53
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54 }
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55
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56 /**
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57 * Gets the canonical representation of a source file, whose contents will be read lazily and
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58 * then cached.
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59 *
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60 * @param reset forces any existing {@link Source} cache to be cleared, forcing a re-read.
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61 */
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62 public Source get(String fileName, boolean reset) {
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63 SourceImpl source = sourceMap.get(fileName);
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64 if (source == null) {
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65 String path = findPath(fileName);
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66 if (path == null) {
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67 throw new RuntimeException("Can't find file " + fileName);
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68 }
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69 source = sourceMap.get(path);
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70 if (source == null) {
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71 source = new FileSourceImpl(fileName, path);
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72 sourceMap.put(path, source);
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73 }
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74 } else {
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75 if (reset) {
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76 source.reset();
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77 }
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78 }
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79 return source;
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80 }
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81
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82 /**
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83 * Gets the canonical representation of a source file, whose contents will be read lazily and
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84 * then cached.
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85 */
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86 public Source get(String fileName) {
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87 return get(fileName, false);
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88 }
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89
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90 /**
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91 * Creates a source from literal text.
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92 */
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93 @SuppressWarnings("static-method")
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94 public Source get(String name, String code) {
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95 assert code != null;
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96 return new LiteralSourceImpl(name, code);
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97 }
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98
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99 /**
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100 * Creates a source whose contents will be read immediately and cached.
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101 */
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102 @SuppressWarnings("static-method")
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103 public Source get(String name, InputStream stream) throws IOException {
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104 InputStreamReader reader = new InputStreamReader(stream);
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105 return new LiteralSourceImpl(name, readCode(reader));
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106 }
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107
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108 /**
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109 * Creates a source from literal text, but which acts as a file and can be retrieved by name
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110 * (unlike other literal sources); intended for testing.
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111 */
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112 public Source getFakeFile(String name, String code) {
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113 final SourceImpl source = new LiteralSourceImpl(name, code);
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114 sourceMap.put(name, source);
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115 return source;
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116 }
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117
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118 // If it names a real file, get the (canonical) normalized absolute path.
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119 private static String findPath(String name) {
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120 final File file = new File(name);
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121 if (file.exists()) {
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122 try {
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123 return file.getCanonicalPath();
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124 } catch (IOException e) {
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125 }
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126 }
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127 return null;
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128 }
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129
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130 private static String readCode(Reader reader) throws IOException {
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131 final StringBuilder builder = new StringBuilder();
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132 final char[] buffer = new char[1024];
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133
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134 while (true) {
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135 final int n = reader.read(buffer);
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136 if (n == -1) {
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137 break;
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138 }
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139 builder.append(buffer, 0, n);
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140 }
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141
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142 return builder.toString();
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143 }
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144
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145 private abstract static class SourceImpl implements Source {
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146
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147 protected TextMap textMap = null;
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148
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149 protected abstract void reset();
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150
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151 public final InputStream getInputStream() {
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152 return new ByteArrayInputStream(getCode().getBytes());
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153 }
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154
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155 /**
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156 * Gets the text (not including a possible terminating newline) in a (1-based) numbered
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157 * line.
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158 */
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159 public final String getCode(int lineNumber) {
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160 checkTextMap();
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161 final int offset = textMap.lineStartOffset(lineNumber);
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162 final int length = textMap.lineLength(lineNumber);
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163 return getCode().substring(offset, offset + length);
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164 }
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165
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166 /**
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167 * The number of text lines in the source.
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168 */
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169 public final int getLineCount() {
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170 return checkTextMap().lineCount();
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171 }
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172
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173 /**
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174 * The 1-based number of the line that includes a 0-based character offset.
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175 */
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176 public final int getLineNumber(int offset) {
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177 return checkTextMap().offsetToLine(offset);
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178 }
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179
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180 /**
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181 * The 0-based character offset at the start of a (1-based) numbered line.
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182 */
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183 public final int getLineStartOffset(int lineNumber) {
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184 return checkTextMap().lineStartOffset(lineNumber);
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185 }
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186
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187 /**
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188 * The number of characters (not counting a possible terminating newline) in a (1-based)
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189 * numbered line.
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190 */
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191 public final int getLineLength(int lineNumber) {
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192 return checkTextMap().lineLength(lineNumber);
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193 }
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194
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195 private TextMap checkTextMap() {
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196 if (textMap == null) {
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197 final String code = getCode();
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198 if (code == null) {
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199 throw new RuntimeException("can't read file " + getName());
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200 }
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201 textMap = new TextMap(code);
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202 }
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203 return textMap;
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204 }
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205 }
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206
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207 public static class LiteralSourceImpl extends SourceImpl {
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208
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209 private final String name; // Name used originally to describe the source
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210 private final String code;
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211
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212 public LiteralSourceImpl(String name, String code) {
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213 this.name = name;
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214 this.code = code;
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215 }
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216
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217 @Override
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218 public String getName() {
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219 return name;
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220 }
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221
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222 @Override
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223 public String getCode() {
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224 return code;
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225 }
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226
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227 @Override
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228 public String getPath() {
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229 return name;
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230 }
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231
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232 @Override
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233 public Reader getReader() {
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234 return new StringReader(code);
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235 }
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236
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237 @Override
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238 protected void reset() {
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239 }
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240
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241 @Override
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242 public int hashCode() {
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243 final int prime = 31;
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244 int result = 1;
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245 result = prime * result + name.hashCode();
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246 result = prime * result + (code == null ? 0 : code.hashCode());
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247 return result;
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248 }
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249
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250 @Override
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251 public boolean equals(Object obj) {
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252 if (this == obj) {
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253 return true;
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254 }
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255 if (obj == null) {
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256 return false;
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257 }
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258 if (!(obj instanceof LiteralSourceImpl)) {
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259 return false;
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260 }
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261 LiteralSourceImpl other = (LiteralSourceImpl) obj;
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262 return name.equals(other.name) && code.equals(other.code);
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263 }
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264
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265 }
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266
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267 private static class FileSourceImpl extends SourceImpl {
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268
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269 private final String name; // Name used originally to describe the source
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270 private String code = null;
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271 private final String path; // Normalized path description of an actual file
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272 private boolean readAttempted;
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273
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274 public FileSourceImpl(String name, String path) {
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275 this.name = name;
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276 this.path = path;
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277 this.readAttempted = false;
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278
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279 }
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280
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281 @Override
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282 public String getName() {
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283 return name;
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284 }
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285
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286 @Override
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287 public String getCode() {
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288 if (code == null && !readAttempted) {
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289 readAttempted = true;
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290 try {
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291 code = readCode(getReader());
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292 } catch (IOException e) {
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293 }
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294 }
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295 return code;
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296 }
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297
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298 @Override
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299 public String getPath() {
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300 return path;
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301 }
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302
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303 @Override
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304 public Reader getReader() {
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305 if (code != null) {
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306 return new StringReader(code);
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307 }
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308 try {
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309 return new BufferedReader(new FileReader(path));
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310 } catch (FileNotFoundException e) {
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311 throw new RuntimeException("Can't find file " + path);
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312 }
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313 }
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314
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315 @Override
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316 protected void reset() {
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317 this.code = null;
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318 this.readAttempted = false;
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319 }
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320
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321 }
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322
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323 }