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annotate src/luan/lib/PackageLib.java @ 86:6db8f286fa6c

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_ENV is per module, not global git-svn-id: https://luan-java.googlecode.com/svn/trunk@87 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 27 Feb 2013 08:03:51 +0000
parents cca4f8522893
children 6ca02b188dba
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1 package luan.lib;
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3 import java.io.File;
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4 import java.io.IOException;
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5 import java.net.URL;
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6 import java.util.Arrays;
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7 import java.util.Collections;
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8 import luan.Luan;
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9 import luan.LuanState;
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10 import luan.LuanTable;
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11 import luan.LuanFunction;
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12 import luan.LuanLoader;
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13 import luan.LuanJavaFunction;
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14 import luan.LuanElement;
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15 import luan.LuanException;
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18 public final class PackageLib {
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20 public static final String NAME = "package";
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22 public static final LuanLoader LOADER = new LuanLoader() {
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23 @Override protected void load(LuanState luan) {
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24 LuanTable module = new LuanTable();
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25 LuanTable global = new LuanTable();
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26 module.put( LuanState._G, global );
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27 module.put("loaded",luan.loaded());
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28 module.put("preload",luan.preload());
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29 module.put("path","?.lua");
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30 try {
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31 add( global, "require", LuanState.class, String.class );
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32 add( global, "module", LuanState.class, String.class );
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33 add( module, "search_path", String.class, String.class );
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34 } catch(NoSuchMethodException e) {
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35 throw new RuntimeException(e);
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36 }
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37 module.put("searchers",new LuanTable(Arrays.<Object>asList(preloadSearcher,fileSearcher,javaFileSearcher)));
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38 luan.loaded().put(NAME,module);
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39 }
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40 };
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42 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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43 t.put( method, new LuanJavaFunction(PackageLib.class.getMethod(method,parameterTypes),null) );
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44 }
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46 public static void module(LuanState luan,String modName) throws LuanException {
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47 LuanTable module = new LuanTable();
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48 luan.currentEnvironment().put(modName,module);
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49 luan.loaded().put(modName,module);
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50 }
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52 public static void require(LuanState luan,String modName) throws LuanException {
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53 require(luan,modName,luan.currentEnvironment());
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54 }
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56 public static void require(LuanState luan,String modName,LuanTable env) throws LuanException {
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57 LuanTable mod = (LuanTable)luan.loaded().get(modName);
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58 if( mod == null ) {
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59 LuanTable searchers = (LuanTable)luan.get("package.searchers");
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60 if( searchers == null )
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61 searchers = new LuanTable(Collections.<Object>singletonList(preloadSearcher));
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62 for( Object s : searchers.asList() ) {
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63 LuanFunction searcher = (LuanFunction)s;
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64 Object[] a = luan.call(searcher,LuanElement.JAVA,"<searcher>",modName);
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65 if( a.length >= 1 && a[0] instanceof LuanFunction ) {
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66 LuanFunction loader = (LuanFunction)a[0];
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67 luan.call(loader,LuanElement.JAVA,"<loader>");
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68 mod = (LuanTable)luan.loaded().get(modName);
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69 if( mod==null )
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70 throw new LuanException( luan, LuanElement.JAVA, "module '"+modName+"' didn't define its module" );
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71 break;
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72 }
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73 }
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74 if( mod == null )
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75 throw new LuanException( luan, LuanElement.JAVA, "module '"+modName+"' not found" );
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76 }
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77 if( env != null )
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78 env.put(modName,mod);
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79 }
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81 public static String search_path(String name,String path) {
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82 for( String s : path.split(";") ) {
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83 String file = s.replaceAll("\\?",name);
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84 if( new File(file).exists() )
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85 return file;
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86 }
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87 return null;
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88 }
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90 private static final class FileLoader extends LuanLoader {
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91 private final String fileName;
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93 FileLoader(String fileName) {
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94 this.fileName = fileName;
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95 }
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97 @Override protected void load(LuanState luan) throws LuanException {
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98 LuanFunction fn = BasicLib.load_file(luan,fileName,null);
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99 fn.call(luan,EMPTY);
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100 }
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101 };
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102
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103 public static final LuanFunction fileSearcher = new LuanFunction() {
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104 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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105 String modName = (String)args[0];
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106 String path = (String)luan.get("package.path");
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107 if( path==null )
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108 return LuanFunction.EMPTY;
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109 String file = search_path(modName,path);
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110 return file==null ? LuanFunction.EMPTY : new Object[]{new FileLoader(file)};
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111 }
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112 };
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113
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114 public static final LuanFunction preloadSearcher = new LuanFunction() {
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115 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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116 String modName = (String)args[0];
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117 Object mod = luan.preload().get(modName);
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118 return new Object[]{mod};
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119 }
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120 };
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121
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122
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123
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124
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125 private static final class JavaFileLoader extends LuanLoader {
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126 private final URL url;
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127
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128 JavaFileLoader(URL url) {
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129 this.url = url;
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130 }
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131
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132 @Override protected void load(LuanState luan) throws LuanException {
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133 try {
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134 String src = Utils.read(url);
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135 LuanFunction fn = BasicLib.load(luan,src,url.toString(),null);
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136 fn.call(luan,EMPTY);
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137 } catch(IOException e) {
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138 throw new LuanException(luan,LuanElement.JAVA,e);
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139 }
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140 }
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141 };
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142
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143 public static final LuanFunction javaFileSearcher = new LuanFunction() {
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144 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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145 String modName = (String)args[0];
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146 String path = (String)luan.get("package.jpath");
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147 if( path==null )
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148 return LuanFunction.EMPTY;
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149 for( String s : path.split(";") ) {
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150 String file = s.replaceAll("\\?",modName);
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151 URL url = ClassLoader.getSystemResource(file);
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152 if( url != null ) {
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153 return new Object[]{new JavaFileLoader(url)};
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154 }
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155 }
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156 return LuanFunction.EMPTY;
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157 }
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158 };
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159
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160 }