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annotate src/luan/lib/PackageLib.java @ 73:f86e4f77ef32

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add package module git-svn-id: https://luan-java.googlecode.com/svn/trunk@74 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 12 Feb 2013 09:46:45 +0000
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children f003338d503b
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rev   line source
73
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1 package luan.lib;
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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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15 public final class PackageLib {
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17 public static final String NAME = "package";
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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 global.put(NAME,module);
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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","?.lua");
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28 try {
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29 add( global, "require", 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 LuanFunction.EMPTY_RTN;
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38 }
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39 };
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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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45 public static Object require(LuanState luan,String modName) throws LuanException {
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46 LuanTable module = (LuanTable)luan.global.get(NAME);
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47 Object mod = luan.loaded.get(modName);
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48 if( mod == null ) {
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49 LuanTable searchers = (LuanTable)module.get("searchers");
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50 for( Object s : searchers.asList() ) {
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51 LuanFunction searcher = (LuanFunction)s;
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52 Object[] a = luan.call(searcher,LuanElement.JAVA,"searcher",modName);
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53 if( a.length >= 1 && a[0] instanceof LuanFunction ) {
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54 LuanFunction loader = (LuanFunction)a[0];
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55 Object extra = a.length >= 2 ? a[1] : null;
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56 mod = luan.load(loader,modName,extra);
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57 }
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58 }
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59 if( mod == null )
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60 throw new LuanException( luan, LuanElement.JAVA, "module '"+modName+"' not found" );
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61 }
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62 return mod;
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63 }
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65 public static String search_path(String NAME,String path) {
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66 for( String s : path.split(";") ) {
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67 String file = s.replaceAll("\\?",NAME);
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68 if( new File(file).exists() )
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69 return file;
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70 }
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71 return null;
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72 }
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74 private static final LuanFunction fileLoader = new LuanFunction() {
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75 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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76 return BasicLib.do_file(luan,(String)args[1]);
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77 }
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78 };
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80 public static Object[] fileSearcher(LuanState luan,String modName) {
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81 LuanTable module = (LuanTable)luan.global.get(NAME);
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82 String path = (String)module.get("path");
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83 String file = search_path(modName,path);
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84 return file==null ? LuanFunction.EMPTY_RTN : new Object[]{fileLoader,file};
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85 }
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86
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87 public static Object preloadSearcher(LuanState luan,String modName) {
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88 return luan.preload.get(modName);
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89 }
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91 }