Mercurial Hosting > luan
view src/luan/lib/PackageLib.java @ 75:aa7538ae5fb6
can now load modules from classpath
git-svn-id: https://luan-java.googlecode.com/svn/trunk@76 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 09:19:15 +0000 |
parents | f003338d503b |
children | 4bf3d0c0b6b9 |
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package luan.lib; import java.io.File; import java.io.IOException; import java.net.URL; import java.util.Arrays; import luan.Luan; import luan.LuanState; import luan.LuanTable; import luan.LuanFunction; import luan.LuanJavaFunction; import luan.LuanElement; import luan.LuanException; public final class PackageLib { public static final String NAME = "package"; public static final LuanFunction LOADER = new LuanFunction() { public Object[] call(LuanState luan,Object[] args) throws LuanException { LuanTable global = luan.global; LuanTable module = new LuanTable(); module.put("loaded",luan.loaded); module.put("preload",luan.preload); // module.put("path","?.lua"); try { add( global, "require", LuanState.class, String.class ); add( module, "module", LuanState.class, String.class ); add( module, "search_path", String.class, String.class ); } catch(NoSuchMethodException e) { throw new RuntimeException(e); } module.put("searchers",new LuanTable(Arrays.<Object>asList(preloadSearcher,fileSearcher,javaFileSearcher))); return new Object[]{module}; } }; private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException { t.put( method, new LuanJavaFunction(PackageLib.class.getMethod(method,parameterTypes),null) ); } public static void require(LuanState luan,String modName) throws LuanException { Object mod = module(luan,modName); if( mod instanceof LuanTable ) luan.global.put(modName,mod); } public static Object module(LuanState luan,String modName) throws LuanException { Object mod = luan.loaded.get(modName); if( mod == null ) { LuanTable searchers = (LuanTable)luan.get("package.searchers"); for( Object s : searchers.asList() ) { LuanFunction searcher = (LuanFunction)s; Object[] a = luan.call(searcher,LuanElement.JAVA,"searcher",modName); if( a.length >= 1 && a[0] instanceof LuanFunction ) { LuanFunction loader = (LuanFunction)a[0]; Object extra = a.length >= 2 ? a[1] : null; mod = Luan.first(luan.call(loader,LuanElement.JAVA,"loader",modName,extra)); if( mod == null ) mod = true; luan.loaded.put(modName,mod); } } if( mod == null ) throw new LuanException( luan, LuanElement.JAVA, "module '"+modName+"' not found" ); } return mod; } public static String search_path(String name,String path) { for( String s : path.split(";") ) { String file = s.replaceAll("\\?",name); if( new File(file).exists() ) return file; } return null; } private static final LuanFunction fileLoader = new LuanFunction() { public Object[] call(LuanState luan,Object[] args) throws LuanException { String modName = (String)args[0]; String fileName = (String)args[1]; LuanFunction fn = BasicLib.load_file(luan,fileName); return luan.call(fn,LuanElement.JAVA,modName,args); } }; public static final LuanFunction fileSearcher = new LuanFunction() { public Object[] call(LuanState luan,Object[] args) throws LuanException { String modName = (String)args[0]; String path = (String)luan.get("package.path"); if( path==null ) return LuanFunction.EMPTY_RTN; String file = search_path(modName,path); return file==null ? LuanFunction.EMPTY_RTN : new Object[]{fileLoader,file}; } }; public static final LuanFunction preloadSearcher = new LuanFunction() { public Object[] call(LuanState luan,Object[] args) throws LuanException { String modName = (String)args[0]; return new Object[]{luan.preload.get(modName)}; } }; private static final LuanFunction javaFileLoader = new LuanFunction() { public Object[] call(LuanState luan,Object[] args) throws LuanException { try { String modName = (String)args[0]; URL url = (URL)args[1]; String src = Utils.read(url); LuanFunction fn = BasicLib.load(luan,src,url.toString()); return luan.call(fn,LuanElement.JAVA,modName,args); } catch(IOException e) { throw new LuanException(luan,LuanElement.JAVA,e); } } }; public static final LuanFunction javaFileSearcher = new LuanFunction() { public Object[] call(LuanState luan,Object[] args) throws LuanException { String modName = (String)args[0]; String path = (String)luan.get("package.jpath"); if( path==null ) return LuanFunction.EMPTY_RTN; for( String s : path.split(";") ) { String file = s.replaceAll("\\?",modName); URL url = ClassLoader.getSystemResource(file); if( url != null ) { return new Object[]{javaFileLoader,url}; } } return LuanFunction.EMPTY_RTN; } }; }