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annotate src/luan/lib/PackageLib.java @ 75:aa7538ae5fb6

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can now load modules from classpath git-svn-id: https://luan-java.googlecode.com/svn/trunk@76 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 13 Feb 2013 09:19:15 +0000
parents f003338d503b
children 4bf3d0c0b6b9
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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 luan.Luan;
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8 import luan.LuanState;
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9 import luan.LuanTable;
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10 import luan.LuanFunction;
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11 import luan.LuanJavaFunction;
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12 import luan.LuanElement;
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13 import luan.LuanException;
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16 public final class PackageLib {
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18 public static final String NAME = "package";
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20 public static final LuanFunction LOADER = new LuanFunction() {
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21 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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22 LuanTable global = luan.global;
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23 LuanTable module = new LuanTable();
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24 module.put("loaded",luan.loaded);
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25 module.put("preload",luan.preload);
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26 // module.put("path","?.lua");
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27 try {
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28 add( global, "require", LuanState.class, String.class );
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29 add( module, "module", LuanState.class, String.class );
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30 add( module, "search_path", String.class, String.class );
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31 } catch(NoSuchMethodException e) {
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32 throw new RuntimeException(e);
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33 }
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34 module.put("searchers",new LuanTable(Arrays.<Object>asList(preloadSearcher,fileSearcher,javaFileSearcher)));
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35 return new Object[]{module};
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36 }
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37 };
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39 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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40 t.put( method, new LuanJavaFunction(PackageLib.class.getMethod(method,parameterTypes),null) );
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41 }
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43 public static void require(LuanState luan,String modName) throws LuanException {
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44 Object mod = module(luan,modName);
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45 if( mod instanceof LuanTable )
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46 luan.global.put(modName,mod);
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47 }
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49 public static Object module(LuanState luan,String modName) throws LuanException {
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50 Object mod = luan.loaded.get(modName);
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51 if( mod == null ) {
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52 LuanTable searchers = (LuanTable)luan.get("package.searchers");
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53 for( Object s : searchers.asList() ) {
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54 LuanFunction searcher = (LuanFunction)s;
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55 Object[] a = luan.call(searcher,LuanElement.JAVA,"searcher",modName);
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56 if( a.length >= 1 && a[0] instanceof LuanFunction ) {
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57 LuanFunction loader = (LuanFunction)a[0];
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58 Object extra = a.length >= 2 ? a[1] : null;
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59 mod = Luan.first(luan.call(loader,LuanElement.JAVA,"loader",modName,extra));
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60 if( mod == null )
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61 mod = true;
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62 luan.loaded.put(modName,mod);
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63 }
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64 }
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65 if( mod == null )
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66 throw new LuanException( luan, LuanElement.JAVA, "module '"+modName+"' not found" );
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67 }
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68 return mod;
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69 }
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71 public static String search_path(String name,String path) {
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72 for( String s : path.split(";") ) {
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73 String file = s.replaceAll("\\?",name);
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74 if( new File(file).exists() )
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75 return file;
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76 }
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77 return null;
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78 }
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80 private static final LuanFunction fileLoader = new LuanFunction() {
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81 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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82 String modName = (String)args[0];
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83 String fileName = (String)args[1];
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84 LuanFunction fn = BasicLib.load_file(luan,fileName);
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85 return luan.call(fn,LuanElement.JAVA,modName,args);
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86 }
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87 };
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88
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89 public static final LuanFunction fileSearcher = new LuanFunction() {
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90 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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91 String modName = (String)args[0];
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92 String path = (String)luan.get("package.path");
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93 if( path==null )
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94 return LuanFunction.EMPTY_RTN;
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95 String file = search_path(modName,path);
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96 return file==null ? LuanFunction.EMPTY_RTN : new Object[]{fileLoader,file};
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97 }
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98 };
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100 public static final LuanFunction preloadSearcher = new LuanFunction() {
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101 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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102 String modName = (String)args[0];
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103 return new Object[]{luan.preload.get(modName)};
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104 }
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105 };
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106
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107
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108
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109
75
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110 private static final LuanFunction javaFileLoader = new LuanFunction() {
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111 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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112 try {
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113 String modName = (String)args[0];
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114 URL url = (URL)args[1];
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115 String src = Utils.read(url);
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116 LuanFunction fn = BasicLib.load(luan,src,url.toString());
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117 return luan.call(fn,LuanElement.JAVA,modName,args);
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118 } catch(IOException e) {
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119 throw new LuanException(luan,LuanElement.JAVA,e);
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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 public static final LuanFunction javaFileSearcher = new LuanFunction() {
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125 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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126 String modName = (String)args[0];
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127 String path = (String)luan.get("package.jpath");
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128 if( path==null )
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129 return LuanFunction.EMPTY_RTN;
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130 for( String s : path.split(";") ) {
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131 String file = s.replaceAll("\\?",modName);
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132 URL url = ClassLoader.getSystemResource(file);
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133 if( url != null ) {
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134 return new Object[]{javaFileLoader,url};
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135 }
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136 }
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137 return LuanFunction.EMPTY_RTN;
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138 }
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139 };
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140
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141 }