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annotate src/luan/lib/PackageLib.java @ 143:fcb81fa2df0d

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handle urls and java resources as files git-svn-id: https://luan-java.googlecode.com/svn/trunk@144 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 13 Jun 2014 19:04:05 +0000
parents 05f8c21160ef
children 2e92f0a6fcac
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1 package luan.lib;
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3 import java.io.IOException;
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4 import java.util.Arrays;
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5 import java.util.Collections;
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6 import java.util.List;
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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 LuanFunction LOADER = new LuanFunction() {
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19 @Override public Object call(LuanState luan,Object[] args) {
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20 LuanTable module = new LuanTable();
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21 LuanTable global = luan.global();
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22 module.put("loaded",luan.loaded());
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23 module.put("preload",luan.preload());
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24 module.put("path","?.luan");
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25 try {
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26 add( global, "require", LuanState.class, String.class );
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27 add( module, "get_loader", String.class );
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28 add( module, "search_path", String.class, String.class );
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29 } catch(NoSuchMethodException e) {
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30 throw new RuntimeException(e);
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31 }
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32 LuanTable searchers = luan.searchers();
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33 searchers.add(preloadSearcher);
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34 searchers.add(fileSearcher);
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35 module.put("searchers",searchers);
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36 return module;
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37 }
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38 };
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40 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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41 t.put( method, new LuanJavaFunction(PackageLib.class.getMethod(method,parameterTypes),null) );
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42 }
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44 public static Object require(LuanState luan,String modName) throws LuanException {
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45 LuanTable loaded = luan.loaded();
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46 Object mod = loaded.get(modName);
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47 if( mod == null ) {
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48 List<Object> list = null;
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49 String searchFor = modName;
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50 LuanTable searchers = (LuanTable)luan.get("Package.searchers");
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51 if( searchers == null ) {
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52 list = Collections.<Object>singletonList(preloadSearcher);
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53 } else {
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54 list = searchers.asList();
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55 }
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56 for( Object s : list ) {
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57 LuanFunction searcher = (LuanFunction)s;
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58 Object[] a = Luan.array(luan.call(searcher,"<searcher>",new Object[]{searchFor}));
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59 if( a.length >= 1 && a[0] instanceof LuanFunction ) {
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60 LuanFunction loader = (LuanFunction)a[0];
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61 a[0] = modName;
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62 mod = Luan.first(luan.call(loader,"<require \""+modName+"\">",a));
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63 if( mod != null ) {
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64 loaded.put(modName,mod);
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65 } else {
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66 mod = loaded.get(modName);
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67 if( mod==null )
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68 loaded.put(modName,true);
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69 }
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70 break;
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71 }
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72 }
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73 if( mod == null )
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74 throw luan.exception( "module '"+modName+"' not found" );
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75 }
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76 return mod;
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77 }
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79 public static String search_path(String name,String path) {
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80 for( String s : path.split(";") ) {
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81 String file = s.replaceAll("\\?",name);
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82 if( Utils.exists(file) )
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83 return file;
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84 }
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85 return null;
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86 }
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87
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88 public static final LuanFunction fileLoader = new LuanFunction() {
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89 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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90 String fileName = (String)args[1];
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91 LuanFunction fn = BasicLib.load_file(luan,fileName);
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92 return fn.call(luan,args);
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93 }
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94 };
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96 public static final LuanFunction fileSearcher = new LuanFunction() {
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97 @Override public Object[] call(LuanState luan,Object[] args) {
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98 String modName = (String)args[0];
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99 String path = (String)luan.get("Package.path");
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100 if( path==null )
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101 return LuanFunction.NOTHING;
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102 String file = search_path(modName,path);
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103 return file==null ? LuanFunction.NOTHING : new Object[]{fileLoader,file};
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104 }
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105 };
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106
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107 public static final LuanFunction preloadSearcher = new LuanFunction() {
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108 @Override public Object call(LuanState luan,Object[] args) {
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109 String modName = (String)args[0];
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110 return luan.preload().get(modName);
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111 }
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112 };
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113
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114
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115
141
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116 public static LuanFunction get_loader(String path)
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117 throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException
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118 {
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119 int i = path.lastIndexOf('.');
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120 String clsPath = path.substring(0,i);
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121 String fld = path.substring(i+1);
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122 Class cls = Class.forName(clsPath);
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123 return (LuanFunction)cls.getField(fld).get(null);
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124 }
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125
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126 }