--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/luan/modules/JavaLib.java	Sun Jun 22 04:28:32 2014 +0000
@@ -0,0 +1,450 @@
+package luan.modules;
+
+import java.lang.reflect.Array;
+import java.lang.reflect.AccessibleObject;
+import java.lang.reflect.Member;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Modifier;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Proxy;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.Collections;
+import java.util.Arrays;
+import luan.Luan;
+import luan.LuanState;
+import luan.LuanTable;
+import luan.MetatableGetter;
+import luan.LuanException;
+import luan.LuanFunction;
+import luan.LuanJavaFunction;
+import luan.LuanElement;
+
+
+public final class JavaLib {
+
+	public static final LuanFunction LOADER = new LuanFunction() {
+		@Override public Object call(LuanState luan,Object[] args) {
+			luan.addMetatableGetter(mg);
+			LuanTable module = new LuanTable();
+			try {
+				module.put( "class", new LuanJavaFunction(JavaLib.class.getMethod("getClass",LuanState.class,String.class),null) );
+				add( module, "proxy", LuanState.class, Static.class, LuanTable.class, Object.class );
+			} catch(NoSuchMethodException e) {
+				throw new RuntimeException(e);
+			}
+			luan.searchers().add(javaSearcher);
+			return module;
+		}
+	};
+
+	public static final LuanFunction javaSearcher = new LuanFunction() {
+		@Override public Object call(LuanState luan,Object[] args) throws LuanException {
+			String modName = (String)args[0];
+			final Static s = JavaLib.getClass(luan,modName);
+			if( s==null )
+				return null;
+			LuanFunction loader = new LuanFunction() {
+				@Override public Object call(LuanState luan,Object[] args) {
+					return s;
+				}
+			};
+			return loader;
+		}
+	};
+
+	private static void add(LuanTable t,String method,Class<?>... parameterTypes) {
+		try {
+			t.put( method, new LuanJavaFunction(JavaLib.class.getMethod(method,parameterTypes),null) );
+		} catch(NoSuchMethodException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	private static final LuanTable mt = new LuanTable();
+	static {
+		add( mt, "__index", LuanState.class, Object.class, Object.class );
+		add( mt, "__newindex", LuanState.class, Object.class, Object.class, Object.class );
+	}
+
+	private static final MetatableGetter mg = new MetatableGetter() {
+		public LuanTable getMetatable(Object obj) {
+			if( obj==null )
+				return null;
+			return mt;
+		}
+	};
+
+	public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
+		if( obj instanceof Static ) {
+			if( key instanceof String ) {
+				String name = (String)key;
+				Static st = (Static)obj;
+				Class cls = st.cls;
+				if( "class".equals(name) ) {
+					return cls;
+				} else if( "new".equals(name) ) {
+					Constructor<?>[] constructors = cls.getConstructors();
+					if( constructors.length > 0 ) {
+						if( constructors.length==1 ) {
+							return new LuanJavaFunction(constructors[0],null);
+						} else {
+							List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
+							for( Constructor constructor : constructors ) {
+								fns.add(new LuanJavaFunction(constructor,null));
+							}
+							return new AmbiguousJavaFunction(fns);
+						}
+					}
+				} else if( "assert".equals(name) ) {
+					return new LuanJavaFunction(assertClass,new AssertClass(cls));
+				} else {
+					List<Member> members = getStaticMembers(cls,name);
+					if( !members.isEmpty() ) {
+						return member(null,members);
+					}
+				}
+			}
+			throw luan.exception("invalid member '"+key+"' for: "+obj);
+		}
+		Class cls = obj.getClass();
+		if( cls.isArray() ) {
+			if( "length".equals(key) ) {
+				return Array.getLength(obj);
+			}
+			Integer i = Luan.asInteger(key);
+			if( i != null ) {
+				return Array.get(obj,i);
+			}
+			throw luan.exception("invalid member '"+key+"' for java array: "+obj);
+		}
+		if( key instanceof String ) {
+			String name = (String)key;
+			if( "instanceof".equals(name) ) {
+				return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
+			} else {
+				List<Member> members = getMembers(cls,name);
+				if( !members.isEmpty() ) {
+					return member(obj,members);
+				}
+			}
+		}
+//		throw luan.exception("invalid member '"+key+"' for java object: "+obj);
+		return null;
+	}
+
+	private static Object member(Object obj,List<Member> members) throws LuanException {
+		try {
+			if( members.size()==1 ) {
+				Member member = members.get(0);
+				if( member instanceof Static ) {
+					return member;
+				} else if( member instanceof Field ) {
+					Field field = (Field)member;
+					Object rtn = field.get(obj);
+					return rtn instanceof Object[] ? Arrays.asList((Object[])rtn) : rtn;
+				} else {
+					Method method = (Method)member;
+					return new LuanJavaFunction(method,obj);
+				}
+			} else {
+				List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
+				for( Member member : members ) {
+					Method method = (Method)member;
+					fns.add(new LuanJavaFunction(method,obj));
+				}
+				return new AmbiguousJavaFunction(fns);
+			}
+		} catch(IllegalAccessException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException {
+		if( obj instanceof Static ) {
+			if( key instanceof String ) {
+				String name = (String)key;
+				Static st = (Static)obj;
+				Class cls = st.cls;
+				List<Member> members = getStaticMembers(cls,name);
+				if( !members.isEmpty() ) {
+					if( members.size() != 1 )
+						throw new RuntimeException("not field '"+name+"' of "+obj);
+					setMember(obj,members,value);
+					return;
+				}
+			}
+			throw luan.exception("invalid member '"+key+"' for: "+obj);
+		}
+		Class cls = obj.getClass();
+		if( cls.isArray() ) {
+			Integer i = Luan.asInteger(key);
+			if( i != null ) {
+				Array.set(obj,i,value);
+				return;
+			}
+			throw luan.exception("invalid member '"+key+"' for java array: "+obj);
+		}
+		if( key instanceof String ) {
+			String name = (String)key;
+			List<Member> members = getMembers(cls,name);
+			if( !members.isEmpty() ) {
+				if( members.size() != 1 )
+					throw new RuntimeException("not field '"+name+"' of "+obj);
+				setMember(obj,members,value);
+				return;
+			}
+		}
+		throw luan.exception("invalid member '"+key+"' for java object: "+obj);
+	}
+
+	private static void setMember(Object obj,List<Member> members,Object value) {
+		Field field = (Field)members.get(0);
+		try {
+			try {
+				field.set(obj,value);
+			} catch(IllegalArgumentException e) {
+				Class cls = field.getType();
+				if( value instanceof Number ) {
+					Number n = (Number)value;
+					if( cls.equals(Integer.TYPE) || cls.equals(Integer.class) ) {
+						int r = n.intValue();
+						if( r==n.doubleValue() ) {
+							field.setInt(obj,r);
+							return;
+						}
+					}
+				}
+				throw e;
+			}
+		} catch(IllegalAccessException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	public static boolean privateAccess = false;
+	private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
+
+	private static synchronized List<Member> getMembers(Class cls,String name) {
+		Map<String,List<Member>> clsMap = memberMap.get(cls);
+		if( clsMap == null ) {
+			clsMap = new HashMap<String,List<Member>>();
+			for( Class c : cls.getClasses() ) {
+				String s = c.getSimpleName();
+				List<Member> list = new ArrayList<Member>();
+				clsMap.put(s,list);
+				list.add(new Static(c));
+			}
+			for( Field field : cls.getFields() ) {
+				String s = field.getName();
+				try {
+					if( !cls.getField(s).equals(field) )
+						continue;  // not accessible
+				} catch(NoSuchFieldException e) {
+					throw new RuntimeException(e);
+				}
+				List<Member> list = new ArrayList<Member>();
+				clsMap.put(s,list);
+				list.add(field);
+			}
+			for( Method method : cls.getMethods() ) {
+				String s = method.getName();
+				List<Member> list = clsMap.get(s);
+				if( list == null || !(list.get(0) instanceof Method) ) {
+					list = new ArrayList<Member>();
+					clsMap.put(s,list);
+				}
+				list.add(method);
+			}
+			if( privateAccess ) {
+				for( Method method : cls.getDeclaredMethods() ) {
+					String s = method.getName();
+					List<Member> list = clsMap.get(s);
+					if( list == null ) {
+						list = new ArrayList<Member>();
+						clsMap.put(s,list);
+					} else if( !(list.get(0) instanceof Method) )
+						continue;
+					if( !list.contains(method) ) {
+						list.add(method);
+					}
+				}
+				for( Field field : cls.getDeclaredFields() ) {
+					String s = field.getName();
+					List<Member> list = clsMap.get(s);
+					if( list == null ) {
+						list = new ArrayList<Member>();
+						clsMap.put(s,list);
+						list.add(field);
+					}
+				}
+			}
+			for( List<Member> members : clsMap.values() ) {
+				for( Member m : members ) {
+					if( m instanceof AccessibleObject )
+						((AccessibleObject)m).setAccessible(true);
+				}
+			}
+			memberMap.put(cls,clsMap);
+		}
+		List<Member> rtn = clsMap.get(name);
+		if( rtn==null )
+			rtn = Collections.emptyList();
+		return rtn;
+	}
+
+	private static synchronized List<Member> getStaticMembers(Class cls,String name) {
+		List<Member> staticMembers = new ArrayList<Member>();
+		for( Member m : getMembers(cls,name) ) {
+			if( Modifier.isStatic(m.getModifiers()) )
+				staticMembers.add(m);
+		}
+		return staticMembers;
+	}
+
+	static final class Static implements Member {
+		final Class cls;
+
+		Static(Class cls) {
+			this.cls = cls;
+		}
+
+		@Override public String toString() {
+			return cls.toString();
+		}
+
+		@Override public Class<?> getDeclaringClass() {
+			return cls.getDeclaringClass();
+		}
+
+		@Override public String getName() {
+			return cls.getName();
+		}
+
+		@Override public int getModifiers() {
+			return cls.getModifiers();
+		}
+
+		@Override public boolean isSynthetic() {
+			return cls.isSynthetic();
+		}
+	}
+
+	public static Static getClass(LuanState luan,String name) throws LuanException {
+		Class cls;
+		try {
+			cls = Class.forName(name);
+		} catch(ClassNotFoundException e) {
+			try {
+				cls = Thread.currentThread().getContextClassLoader().loadClass(name);
+			} catch(ClassNotFoundException e2) {
+				return null;
+			}
+		}
+		return new Static(cls);
+	}
+/*
+	public static void importClass(LuanState luan,String name) throws LuanException {
+		luan.currentEnvironment().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
+	}
+*/
+	static class AmbiguousJavaFunction extends LuanFunction {
+		private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
+
+		AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
+			for( LuanJavaFunction fn : fns ) {
+				Integer n = fn.getParameterTypes().length;
+				List<LuanJavaFunction> list = fnMap.get(n);
+				if( list==null ) {
+					list = new ArrayList<LuanJavaFunction>();
+					fnMap.put(n,list);
+				}
+				list.add(fn);
+			}
+		}
+
+		@Override public Object call(LuanState luan,Object[] args) throws LuanException {
+			for( LuanJavaFunction fn : fnMap.get(args.length) ) {
+				try {
+					return fn.rawCall(luan,args);
+				} catch(IllegalArgumentException e) {}
+			}
+			throw luan.exception("no method matched args");
+		}
+	}
+
+	private static class InstanceOf {
+		private final Object obj;
+
+		InstanceOf(Object obj) {
+			this.obj = obj;
+		}
+
+		public boolean instanceOf(Static st) {
+			return st.cls.isInstance(obj);
+		}
+	}
+	private static final Method instanceOf;
+	static {
+		try {
+			instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
+			instanceOf.setAccessible(true);
+		} catch(NoSuchMethodException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+
+	private static class AssertClass {
+		private final Class cls;
+
+		AssertClass(Class cls) {
+			this.cls = cls;
+		}
+
+		public Object assertClass(LuanState luan,Object v) throws LuanException {
+			if( !cls.isInstance(v) ) {
+				String got = v.getClass().getSimpleName();
+				String expected = cls.getSimpleName();
+				throw luan.exception("bad argument #1 ("+expected+" expected, got "+got+")");
+			}
+			return v;
+		}
+	}
+	private static final Method assertClass;
+	static {
+		try {
+			assertClass = AssertClass.class.getMethod("assertClass",LuanState.class,Object.class);
+			assertClass.setAccessible(true);
+		} catch(NoSuchMethodException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+
+	public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException {
+		return Proxy.newProxyInstance(
+			st.cls.getClassLoader(),
+			new Class[]{st.cls},
+			new InvocationHandler() {
+				public Object invoke(Object proxy,Method method, Object[] args)
+					throws Throwable
+				{
+					if( args==null )
+						args = new Object[0];
+					String name = method.getName();
+					Object fnObj = t.get(name);
+					if( fnObj==null && base!=null )
+						return method.invoke(base,args);
+					LuanFunction fn = luan.checkFunction(fnObj);
+					return Luan.first(luan.call(fn,name,args));
+				}
+			}
+		);
+	}
+}