Mercurial Hosting > luan
annotate src/luan/lib/PackageLib.java @ 84:cca4f8522893
minor changes
git-svn-id: https://luan-java.googlecode.com/svn/trunk@85 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Mon, 18 Feb 2013 23:15:14 +0000 |
parents | 4bf3d0c0b6b9 |
children | 6db8f286fa6c |
rev | line source |
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1 package luan.lib; |
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2 |
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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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14 |
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15 |
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16 public final class PackageLib { |
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17 |
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18 public static final String NAME = "package"; |
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19 |
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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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38 |
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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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42 |
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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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48 |
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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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70 |
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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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79 |
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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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99 |
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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 Object mod = luan.preload().get(modName); |
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104 return new Object[]{mod}; |
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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 |
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110 |
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111 private static final LuanFunction javaFileLoader = new LuanFunction() { |
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112 public Object[] call(LuanState luan,Object[] args) throws LuanException { |
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113 try { |
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114 String modName = (String)args[0]; |
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115 URL url = (URL)args[1]; |
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116 String src = Utils.read(url); |
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117 LuanFunction fn = BasicLib.load(luan,src,url.toString()); |
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118 return luan.call(fn,LuanElement.JAVA,modName,args); |
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119 } catch(IOException e) { |
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120 throw new LuanException(luan,LuanElement.JAVA,e); |
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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 public static final LuanFunction javaFileSearcher = new LuanFunction() { |
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126 public Object[] call(LuanState luan,Object[] args) throws LuanException { |
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127 String modName = (String)args[0]; |
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128 String path = (String)luan.get("package.jpath"); |
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129 if( path==null ) |
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130 return LuanFunction.EMPTY_RTN; |
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131 for( String s : path.split(";") ) { |
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132 String file = s.replaceAll("\\?",modName); |
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133 URL url = ClassLoader.getSystemResource(file); |
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134 if( url != null ) { |
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135 return new Object[]{javaFileLoader,url}; |
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136 } |
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137 } |
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138 return LuanFunction.EMPTY_RTN; |
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139 } |
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140 }; |
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141 |
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142 } |