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annotate src/luan/lib/PackageLib.java @ 123:d7be9b3abf1a

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minor - rename LuanFunction.EMPTY to NOTHING git-svn-id: https://luan-java.googlecode.com/svn/trunk@124 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 06 Jun 2014 01:14:18 +0000
parents f5af13062b10
children f537ff5e511d
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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.LuanJavaFunction;
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13 import luan.LuanElement;
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14 import luan.LuanException;
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17 public final class PackageLib {
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19 public static final String NAME = "Package";
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21 public static final LuanFunction LOADER = new LuanFunction() {
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22 @Override public Object call(LuanState luan,Object[] args) {
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23 LuanTable module = new LuanTable();
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24 LuanTable global = luan.global();
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25 module.put("loaded",luan.loaded());
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26 module.put("preload",luan.preload());
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27 module.put("path","?.luan");
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28 try {
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29 global.put("require",require);
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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 LuanTable searchers = luan.searchers();
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35 searchers.add(preloadSearcher);
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36 searchers.add(fileSearcher);
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37 searchers.add(javaFileSearcher);
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38 module.put("searchers",searchers);
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39 return module;
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40 }
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41 };
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43 public static final LuanFunction require;
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44 static {
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45 try {
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46 require = new LuanJavaFunction(PackageLib.class.getMethod("require", LuanState.class, String.class),null);
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47 } catch(NoSuchMethodException e) {
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48 throw new RuntimeException(e);
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49 }
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50 }
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52 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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53 t.put( method, new LuanJavaFunction(PackageLib.class.getMethod(method,parameterTypes),null) );
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54 }
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56 public static Object require(LuanState luan,String modName) throws LuanException {
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57 LuanTable loaded = luan.loaded();
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58 Object mod = loaded.get(modName);
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59 if( mod == null ) {
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60 LuanTable searchers = (LuanTable)luan.get("Package.searchers");
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61 if( searchers == null )
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62 searchers = new LuanTable(Collections.<Object>singletonList(preloadSearcher));
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63 for( Object s : searchers.asList() ) {
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64 LuanFunction searcher = (LuanFunction)s;
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65 Object[] a = Luan.array(luan.JAVA.call(searcher,"<searcher>",new Object[]{modName}));
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66 if( a.length >= 1 && a[0] instanceof LuanFunction ) {
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67 LuanFunction loader = (LuanFunction)a[0];
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68 a[0] = modName;
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69 mod = Luan.first(luan.JAVA.call(loader,"<require \""+modName+"\">",a));
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70 if( mod != null ) {
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71 loaded.put(modName,mod);
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72 } else {
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73 mod = loaded.get(modName);
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74 if( mod==null )
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75 loaded.put(modName,true);
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76 }
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77 break;
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78 }
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79 }
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80 if( mod == null )
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81 throw luan.JAVA.exception( "module '"+modName+"' not found" );
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82 }
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83 return mod;
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84 }
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86 public static String search_path(String name,String path) {
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87 for( String s : path.split(";") ) {
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88 String file = s.replaceAll("\\?",name);
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89 if( new File(file).exists() )
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90 return file;
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91 }
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92 return null;
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93 }
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95 public static final LuanFunction fileLoader = new LuanFunction() {
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96 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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97 String fileName = (String)args[1];
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98 LuanFunction fn = BasicLib.load_file(luan,fileName);
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99 return fn.call(luan,args);
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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 @Override public Object[] call(LuanState luan,Object[] args) {
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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.NOTHING;
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109 String file = search_path(modName,path);
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110 return file==null ? LuanFunction.NOTHING : new Object[]{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 @Override public Object call(LuanState luan,Object[] args) {
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116 String modName = (String)args[0];
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117 return luan.preload().get(modName);
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118 }
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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 public static final LuanFunction javaFileLoader = new LuanFunction() {
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125 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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126 String urlStr = (String)args[1];
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127 try {
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128 URL url = new URL(urlStr);
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129 String src = Utils.read(url);
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130 LuanFunction fn = BasicLib.load(luan,src,urlStr,false);
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131 return fn.call(luan,args);
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132 } catch(IOException e) {
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133 throw luan.JAVA.exception(e);
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134 }
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135 }
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136 };
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137
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138 public static final LuanFunction javaFileSearcher = new LuanFunction() {
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139 @Override public Object[] call(LuanState luan,Object[] args) {
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140 String modName = (String)args[0];
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141 String path = (String)luan.get("Package.jpath");
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142 if( path==null )
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143 return LuanFunction.NOTHING;
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144 for( String s : path.split(";") ) {
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145 String file = s.replaceAll("\\?",modName);
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146 URL url = ClassLoader.getSystemResource(file);
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147 if( url != null ) {
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148 return new Object[]{javaFileLoader,url.toString()};
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149 }
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150 }
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151 return LuanFunction.NOTHING;
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152 }
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153 };
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154
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155 }