Mercurial Hosting > luan
annotate src/luan/lib/PackageLib.java @ 74:f003338d503b
improve package lib
git-svn-id: https://luan-java.googlecode.com/svn/trunk@75 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Wed, 13 Feb 2013 06:27:56 +0000 |
parents | f86e4f77ef32 |
children | aa7538ae5fb6 |
rev | line source |
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73
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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.util.List; |
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5 import java.util.ArrayList; |
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6 import luan.Luan; |
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7 import luan.LuanState; |
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8 import luan.LuanTable; |
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9 import luan.LuanFunction; |
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10 import luan.LuanJavaFunction; |
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11 import luan.LuanElement; |
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12 import luan.LuanException; |
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13 |
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14 |
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15 public final class PackageLib { |
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16 |
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17 public static final String NAME = "package"; |
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18 |
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19 public static final LuanFunction LOADER = new LuanFunction() { |
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20 public Object[] call(LuanState luan,Object[] args) throws LuanException { |
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21 LuanTable global = luan.global; |
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22 LuanTable module = new LuanTable(); |
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23 List<Object> searchers = new ArrayList<Object>(); |
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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 searchers.add( new LuanJavaFunction(PackageLib.class.getMethod("preloadSearcher",LuanState.class,String.class),null) ); |
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32 searchers.add( new LuanJavaFunction(PackageLib.class.getMethod("fileSearcher",LuanState.class,String.class),null) ); |
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33 } catch(NoSuchMethodException e) { |
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34 throw new RuntimeException(e); |
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35 } |
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36 module.put("searchers",new LuanTable(searchers)); |
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37 return new Object[]{module}; |
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38 } |
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39 }; |
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40 |
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41 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException { |
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42 t.put( method, new LuanJavaFunction(PackageLib.class.getMethod(method,parameterTypes),null) ); |
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43 } |
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44 |
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45 public static void require(LuanState luan,String modName) throws LuanException { |
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46 Object mod = module(luan,modName); |
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47 if( mod instanceof LuanTable ) |
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48 luan.global.put(modName,mod); |
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49 } |
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50 |
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51 public static Object module(LuanState luan,String modName) throws LuanException { |
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52 LuanTable module = (LuanTable)luan.global.get(NAME); |
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53 Object mod = luan.loaded.get(modName); |
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54 if( mod == null ) { |
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55 LuanTable searchers = (LuanTable)module.get("searchers"); |
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56 for( Object s : searchers.asList() ) { |
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57 LuanFunction searcher = (LuanFunction)s; |
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58 Object[] a = luan.call(searcher,LuanElement.JAVA,"searcher",modName); |
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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 Object extra = a.length >= 2 ? a[1] : null; |
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62 mod = Luan.first(luan.call(loader,LuanElement.JAVA,"loader",modName,extra)); |
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63 if( mod == null ) |
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64 mod = true; |
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65 luan.loaded.put(modName,mod); |
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66 } |
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67 } |
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68 if( mod == null ) |
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69 throw new LuanException( luan, LuanElement.JAVA, "module '"+modName+"' not found" ); |
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70 } |
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71 return mod; |
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72 } |
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73 |
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74 public static String search_path(String name,String path) { |
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75 for( String s : path.split(";") ) { |
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76 String file = s.replaceAll("\\?",name); |
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77 if( new File(file).exists() ) |
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78 return file; |
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79 } |
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80 return null; |
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81 } |
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82 |
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83 private static final LuanFunction fileLoader = new LuanFunction() { |
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84 public Object[] call(LuanState luan,Object[] args) throws LuanException { |
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85 String modName = (String)args[0]; |
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86 String fileName = (String)args[1]; |
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87 LuanFunction fn = BasicLib.load_file(luan,fileName); |
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88 return luan.call(fn,LuanElement.JAVA,modName,args); |
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89 } |
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90 }; |
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91 |
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92 public static Object[] fileSearcher(LuanState luan,String modName) { |
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93 LuanTable module = (LuanTable)luan.global.get(NAME); |
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94 String path = (String)module.get("path"); |
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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 public static Object preloadSearcher(LuanState luan,String modName) { |
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100 return luan.preload.get(modName); |
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101 } |
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102 |
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103 } |