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annotate core/src/luan/modules/PackageLuan.java @ 267:1507149fc447

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rename Io.get() to Io.Uri() git-svn-id: https://luan-java.googlecode.com/svn/trunk@268 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 29 Oct 2014 22:05:55 +0000
parents 454a486d9c19
children 8ac3eaf8ecd9
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1 package luan.modules;
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2
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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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14
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15
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16 public final class PackageLuan {
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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 = Luan.newTable();
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21 module.put( "loaded", loaded(luan) );
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22 try {
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23 module.put("require",requireFn);
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24 add( module, "load", LuanState.class, String.class );
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9fb218211763 add Package.block();
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25 add( module, "load_lib", LuanState.class, String.class );
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26 add( module, "search", LuanState.class, String.class );
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27 } catch(NoSuchMethodException e) {
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28 throw new RuntimeException(e);
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29 }
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30 return module;
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31 }
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32 };
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34 public static final LuanFunction requireFn;
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35 static {
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36 try {
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37 requireFn = new LuanJavaFunction(PackageLuan.class.getMethod("require",LuanState.class,String.class),null);
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38 } catch(NoSuchMethodException e) {
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39 throw new RuntimeException(e);
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40 }
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41 }
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42
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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(PackageLuan.class.getMethod(method,parameterTypes),null) );
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45 }
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46
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47 public static LuanTable loaded(LuanState luan) {
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48 return luan.registryTable("Package.loaded");
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49 }
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50
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51 private static LuanTable blocked(LuanState luan) {
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52 return luan.registryTable("Package.blocked");
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53 }
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54
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55 private static Object pkg(LuanState luan,String key) {
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56 LuanTable t = (LuanTable)loaded(luan).get("Package");
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57 return t==null ? null : t.get(key);
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58 }
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59
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60 public static Object require(LuanState luan,String modName) throws LuanException {
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61 Object mod = load(luan,modName);
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62 if( mod==null )
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63 throw luan.exception( "module '"+modName+"' not found" );
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64 return mod;
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65 }
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66
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67 public static Object load(LuanState luan,String modName) throws LuanException {
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68 LuanTable loaded = loaded(luan);
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69 Object mod = loaded.get(modName);
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70 if( mod == null ) {
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71 Object[] a = search(luan,modName);
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72 if( a == null )
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73 return null;
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74 LuanFunction loader = (LuanFunction)a[0];
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75 a[0] = modName;
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76 mod = Luan.first(luan.call(loader,"<require \""+modName+"\">",a));
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77 if( mod != null ) {
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78 loaded.put(modName,mod);
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79 } else {
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80 mod = loaded.get(modName);
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81 if( mod==null ) {
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82 mod = true;
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83 loaded.put(modName,mod);
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84 }
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85 }
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86 }
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87 return mod;
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88 }
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89
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90 static LuanFunction loader(LuanState luan,String name,boolean loading) throws LuanException {
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91 LuanTable t = IoLuan.Uri(luan,name,loading);
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92 if( t == null )
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93 return null;
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94 LuanFunction loader = (LuanFunction)t.get("loader");
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95 if( loader == null )
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96 return null;
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97 return (LuanFunction)Luan.first(luan.call(loader,new Object[]{name}));
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98 }
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99
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100 public static Object[] search(LuanState luan,String modName) throws LuanException {
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101 LuanFunction fn = loader(luan,modName,true);
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102 return fn==null ? null : new Object[]{fn,modName};
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103 }
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104
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105
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106 public static void block(LuanState luan,String key) {
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107 blocked(luan).put(key,true);
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108 }
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109
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110 public static boolean is_blocked(LuanState luan,String key) {
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111 return blocked(luan).get(key) != null;
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112 }
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113
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114 public static LuanFunction load_lib(LuanState luan,String path)
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115 throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException, LuanException
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116 {
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117 int i = path.lastIndexOf('.');
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118 String clsPath = path.substring(0,i);
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119 String fld = path.substring(i+1);
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120 Class cls = Class.forName(clsPath);
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121 return (LuanFunction)cls.getField(fld).get(null);
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122 }
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123
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124 }