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1 /*
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2 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
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3 * code is released under a tri EPL/GPL/LGPL license. You can use it,
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4 * redistribute it and/or modify it under the terms of the:
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5 *
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6 * Eclipse Public License version 1.0
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7 * GNU General Public License version 2
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8 * GNU Lesser General Public License version 2.1
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9 */
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10 package com.oracle.truffle.ruby.runtime.subsystems;
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11
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12 import java.io.*;
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13 import java.net.*;
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14 import java.util.*;
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15
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16 import com.oracle.truffle.ruby.runtime.*;
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17 import com.oracle.truffle.ruby.runtime.control.*;
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18 import com.oracle.truffle.ruby.runtime.core.array.*;
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19
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20 /**
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21 * Manages the features loaded into Ruby. This basically means which library files are loaded, but
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22 * Ruby often talks about requiring features, not files.
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23 *
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24 */
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25 public class FeatureManager {
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26
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27 private RubyContext context;
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28
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29 private final Set<String> requiredFiles = new HashSet<>();
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30
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31 public FeatureManager(RubyContext context) {
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32 this.context = context;
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33 }
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34
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35 public boolean require(String feature) throws IOException {
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36 // Some features are handled specially
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37
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38 if (context.getConfiguration().getRubyVersion().is19OrLater() && feature.equals("continuation")) {
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39 // We always load continuations
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40 return true;
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41 }
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42
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43 if (feature.equals("stringio")) {
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44 context.implementationMessage("stringio not yet implemented");
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45 return true;
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46 }
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47
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48 if (feature.equals("rbconfig")) {
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49 // Kernel#rbconfig is always there
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50 return true;
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51 }
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52
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53 if (feature.equals("pp")) {
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54 // Kernel#pretty_inspect is always there
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55 return true;
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56 }
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57
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58 // Get the load path
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59
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60 final Object loadPathObject = context.getCoreLibrary().getGlobalVariablesObject().getInstanceVariable("$:");
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61
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62 if (!(loadPathObject instanceof RubyArray)) {
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63 throw new RuntimeException("$: is not an array");
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64 }
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65
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66 final List<Object> loadPath = ((RubyArray) loadPathObject).asList();
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67
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68 // Try as a full path
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69
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70 if (requireInPath("", feature)) {
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71 return true;
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72 }
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73
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74 // Try each load path in turn
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75
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76 for (Object pathObject : loadPath) {
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77 final String path = pathObject.toString();
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78
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79 if (requireInPath(path, feature)) {
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80 return true;
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81 }
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82 }
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83
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84 // Didn't find the feature
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85
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86 throw new RaiseException(context.getCoreLibrary().loadErrorCannotLoad(feature));
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87 }
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88
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89 public boolean requireInPath(String path, String feature) throws IOException {
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90 if (requireFile(feature)) {
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91 return true;
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92 }
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93
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94 if (requireFile(feature + ".rb")) {
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95 return true;
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96 }
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97
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98 if (requireFile(path + File.separator + feature)) {
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99 return true;
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100 }
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101
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102 if (requireFile(path + File.separator + feature + ".rb")) {
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103 return true;
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104 }
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105
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106 return false;
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107 }
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108
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109 private boolean requireFile(String fileName) throws IOException {
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110 if (requiredFiles.contains(fileName)) {
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111 return true;
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112 }
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113
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114 /*
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115 * There is unfortunately no way to check if a string is a file path, or a URL. file:foo.txt
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116 * is a valid file name, as well as a valid URL. We try as a file path first.
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117 */
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118
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119 if (new File(fileName).isFile()) {
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120 context.loadFile(fileName);
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121 requiredFiles.add(fileName);
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122 return true;
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123 } else {
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124 URL url;
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125
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126 try {
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127 url = new URL(fileName);
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128 } catch (MalformedURLException e) {
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129 return false;
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130 }
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131
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132 InputStream inputStream;
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133
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134 try {
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135 inputStream = url.openConnection().getInputStream();
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136 } catch (IOException e) {
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137 return false;
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138 }
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139
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140 context.load(context.getSourceManager().get(url.toString(), inputStream));
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141 requiredFiles.add(fileName);
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142 return true;
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143 }
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144 }
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145
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146 }
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