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annotate src/luan/lib/PackageLib.java @ 142:05f8c21160ef

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minor git-svn-id: https://luan-java.googlecode.com/svn/trunk@143 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 13 Jun 2014 17:05:31 +0000
parents c2ee8a717b73
children fcb81fa2df0d
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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 java.util.List;
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9 import luan.Luan;
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10 import luan.LuanState;
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11 import luan.LuanTable;
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12 import luan.LuanFunction;
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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 LuanFunction LOADER = new LuanFunction() {
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21 @Override public Object call(LuanState luan,Object[] args) {
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22 LuanTable module = new LuanTable();
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23 LuanTable global = luan.global();
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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","?.luan");
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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, "get_loader", 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 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.put("java",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 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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44 t.put( method, new LuanJavaFunction(PackageLib.class.getMethod(method,parameterTypes),null) );
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45 }
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46
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47 public static Object require(LuanState luan,String modName) throws LuanException {
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48 LuanTable loaded = luan.loaded();
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49 Object mod = loaded.get(modName);
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50 if( mod == null ) {
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51 List<Object> list = null;
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52 String searchFor = modName;
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53 LuanTable searchers = (LuanTable)luan.get("Package.searchers");
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54 if( searchers == null ) {
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55 list = Collections.<Object>singletonList(preloadSearcher);
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56 } else {
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57 int i = modName.indexOf(':');
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58 if( i != -1 ) {
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59 String prefix = modName.substring(0,i);
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60 Object searcher = searchers.get(prefix);
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61 if( searcher != null ) {
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62 list = Collections.<Object>singletonList(searcher);
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63 searchFor = modName.substring(i+1);
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64 }
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65 }
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66 if( list == null )
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67 list = searchers.asList();
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68 }
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69 for( Object s : list ) {
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70 LuanFunction searcher = (LuanFunction)s;
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71 Object[] a = Luan.array(luan.call(searcher,"<searcher>",new Object[]{searchFor}));
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72 if( a.length >= 1 && a[0] instanceof LuanFunction ) {
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73 LuanFunction loader = (LuanFunction)a[0];
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74 a[0] = modName;
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75 mod = Luan.first(luan.call(loader,"<require \""+modName+"\">",a));
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76 if( mod != null ) {
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77 loaded.put(modName,mod);
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78 } else {
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79 mod = loaded.get(modName);
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80 if( mod==null )
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81 loaded.put(modName,true);
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82 }
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83 break;
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84 }
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85 }
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86 if( mod == null )
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87 throw luan.exception( "module '"+modName+"' not found" );
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88 }
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89 return mod;
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90 }
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91
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92 public static String search_path(String name,String path) {
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93 for( String s : path.split(";") ) {
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94 String file = s.replaceAll("\\?",name);
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95 if( new File(file).exists() )
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96 return file;
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97 }
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98 return null;
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99 }
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100
108
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101 public static final LuanFunction fileLoader = new LuanFunction() {
111
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102 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
108
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103 String fileName = (String)args[1];
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104 LuanFunction fn = BasicLib.load_file(luan,fileName);
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105 return fn.call(luan,args);
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106 }
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107 };
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108
75
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109 public static final LuanFunction fileSearcher = new LuanFunction() {
108
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110 @Override public Object[] call(LuanState luan,Object[] args) {
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111 String modName = (String)args[0];
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112 String path = (String)luan.get("Package.path");
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113 if( path==null )
123
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114 return LuanFunction.NOTHING;
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115 String file = search_path(modName,path);
123
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116 return file==null ? LuanFunction.NOTHING : new Object[]{fileLoader,file};
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117 }
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118 };
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119
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120 public static final LuanFunction preloadSearcher = new LuanFunction() {
112
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121 @Override public Object call(LuanState luan,Object[] args) {
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122 String modName = (String)args[0];
112
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123 return luan.preload().get(modName);
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124 }
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125 };
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126
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127
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128
73
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129
108
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130 public static final LuanFunction javaFileLoader = new LuanFunction() {
111
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131 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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132 String urlStr = (String)args[1];
138
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133 String path = (String)args[2];
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134 try {
125
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135 String src = new IoLib.LuanUrl(urlStr).read_text();
138
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136 LuanFunction fn = BasicLib.load(luan,src,path,false,false);
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137 return fn.call(luan,args);
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138 } catch(IOException e) {
130
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139 throw luan.exception(e);
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140 }
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141 }
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142 };
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143
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144 public static final LuanFunction javaFileSearcher = new LuanFunction() {
108
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145 @Override public Object[] call(LuanState luan,Object[] args) {
136
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146 String path = (String)args[0];
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147 String url = IoLib.java_resource_to_url(path);
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148 if( url != null ) {
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149 return new Object[]{javaFileLoader,url,path};
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150 }
123
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151 return LuanFunction.NOTHING;
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152 }
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153 };
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154
141
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155
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156 public static LuanFunction get_loader(String path)
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157 throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException
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158 {
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159 int i = path.lastIndexOf('.');
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160 String clsPath = path.substring(0,i);
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161 String fld = path.substring(i+1);
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162 Class cls = Class.forName(clsPath);
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163 return (LuanFunction)cls.getField(fld).get(null);
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164 }
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165
73
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166 }