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* Copyright (c) 2009-2011 Luaj.org. All rights reserved.
* <p/>
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* <p/>
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* <p/>
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
******************************************************************************/
package org.luaj.vm2.lib;
//TODO 与3.0不一样
import org.luaj.vm2.LuaError;
import org.luaj.vm2.LuaFunction;
import org.luaj.vm2.LuaValue;
import org.luaj.vm2.Varargs;
import java.lang.reflect.Method;
/**
* Subclass of {@link LuaFunction} common to Java functions exposed to lua.
* <p/>
* To provide for common implementations in JME and JSE,
* library functions are typically grouped on one or more library classes
* and an opcode per library function is defined and used to key the switch
* to the correct function within the library.
* <p/>
* Since lua functions can be called with too few or too many arguments,
* and there are overloaded {@link LuaValue#call()} functions with varying
* number of arguments, a Java function exposed in lua needs to handle the
* argument fixup when a function is called with a number of arguments
* differs from that expected.
* <p/>
* To simplify the creation of library functions,
* there are 5 direct subclasses to handle common cases based on number of
* argument values and number of return return values.
* <ul>
* <li>{@link ZeroArgFunction}</li>
* <li>{@link OneArgFunction}</li>
* <li>{@link TwoArgFunction}</li>
* <li>{@link ThreeArgFunction}</li>
* <li>{@link VarArgFunction}</li>
* </ul>
* <p/>
* To be a Java library that can be loaded via {@code require}, it should have
* a public constructor that returns a {@link LuaValue} that, when executed,
* initializes the library.
* <p/>
* For example, the following code will implement a library called "hyperbolic"
* with two functions, "sinh", and "cosh":
* <pre> {@code
* import org.luaj.vm2.LuaValue;
* import org.luaj.vm2.lib.*;
* <p/>
* public class hyperbolic extends TwoArgFunction {
* <p/>
* public hyperbolic() {}
* <p/>
* public LuaValue call(LuaValue modname, LuaValue env) {
* LuaValue library = tableOf();
* library.set( "sinh", new sinh() );
* library.set( "cosh", new cosh() );
* env.set( "hyperbolic", library );
* return library;
* }
* <p/>
* static class sinh extends OneArgFunction {
* public LuaValue call(LuaValue x) {
* return LuaValue.valueOf(Math.sinh(x.checkdouble()));
* }
* }
* <p/>
* static class cosh extends OneArgFunction {
* public LuaValue call(LuaValue x) {
* return LuaValue.valueOf(Math.cosh(x.checkdouble()));
* }
* }
* }
* }</pre>
* The default constructor is used to instantiate the library
* in response to {@code require 'hyperbolic'} statement,
* provided it is on Java"s class path.
* This instance is then invoked with 2 arguments: the name supplied to require(),
* and the environment for this function. The library may ignore these, or use
* them to leave side effects in the global environment, for example.
* In the previous example, two functions are created, 'sinh', and 'cosh', and placed
* into a global table called 'hyperbolic' using the supplied 'env' argument.
* <p/>
* To test it, a script such as this can be used:
* <pre> {@code
* local t = require('hyperbolic')
* print( 't', t )
* print( 'hyperbolic', hyperbolic )
* for k,v in pairs(t) do
* print( 'k,v', k,v )
* end
* print( 'sinh(.5)', hyperbolic.sinh(.5) )
* print( 'cosh(.5)', hyperbolic.cosh(.5) )
* }</pre>
* <p/>
* It should produce something like:
* <pre> {@code
* t table: 3dbbd23f
* hyperbolic table: 3dbbd23f
* k,v cosh function: 3dbbd128
* k,v sinh function: 3dbbd242
* sinh(.5) 0.5210953
* cosh(.5) 1.127626
* }</pre>
* <p/>
* See the source code in any of the library functions
* such as {@link BaseLib} or {@link TableLib} for other examples.
*/
abstract public class LibFunction extends LuaFunction {
/**
* User-defined opcode to differentiate between instances of the library function class.
* <p/>
* Subclass will typicall switch on this value to provide the specific behavior for each function.
*/
public int opcode;
//反射方法
public Method method;
/**
* The common name for this function, useful for debugging.
* <p/>
* Binding functions initialize this to the name to which it is bound.
*/
public String name;
/**
* Default constructor for use by subclasses
*/
protected LibFunction() {
}
public String tojstring() {
return name != null ? name : super.tojstring();
}
/**
* Bind a set of library functions.
* <p/>
* An array of names is provided, and the first name is bound
* with opcode = 0, second with 1, etc.
*
* @param env The environment to apply to each bound function
* @param factory the Class to instantiate for each bound function
* @param names array of String names, one for each function.
* @see #bind(LuaValue, Class, String[], int)
*/
protected void bind(LuaValue env, Class factory, String[] names) {
bind(env, factory, names, 0);
}
/**
* Bind a set of library functions, with an offset
* <p/>
* An array of names is provided, and the first name is bound
* with opcode = {@code firstopcode}, second with {@code firstopcode+1}, etc.
*
* @param env The environment to apply to each bound function
* @param factory the Class to instantiate for each bound function
* @param names array of String names, one for each function.
* @param firstopcode the first opcode to use
* @see #bind(LuaValue, Class, String[])
*/
protected void bind(LuaValue env, Class factory, String[] names, int firstopcode) {
try {
for (int i = 0, n = names.length; i < n; i++) {
LibFunction f = (LibFunction) factory.newInstance();
f.opcode = firstopcode + i;
f.name = names[i];
env.set(f.name, f);
}
} catch (Exception e) {
throw new LuaError("bind failed: " + e);
}
}
/**
* Java code generation utility to allocate storage for upvalue, leave it empty
*/
protected static LuaValue[] newupe() {
return new LuaValue[1];
}
/**
* Java code generation utility to allocate storage for upvalue, initialize with nil
*/
protected static LuaValue[] newupn() {
return new LuaValue[]{NIL};
}
/**
* Java code generation utility to allocate storage for upvalue, initialize with value
*/
protected static LuaValue[] newupl(LuaValue v) {
return new LuaValue[]{v};
}
public LuaValue call() {
return argerror(1, "value");
}
public LuaValue call(LuaValue a) {
return call();
}
public LuaValue call(LuaValue a, LuaValue b) {
return call(a);
}
public LuaValue call(LuaValue a, LuaValue b, LuaValue c) {
return call(a, b);
}
public LuaValue call(LuaValue a, LuaValue b, LuaValue c, LuaValue d) {
return call(a, b, c);
}
public Varargs invoke(Varargs args) {
switch (args.narg()) {
case 0:
return call();
case 1:
return call(args.arg1());
case 2:
return call(args.arg1(), args.arg(2));
case 3:
return call(args.arg1(), args.arg(2), args.arg(3));
default:
return call(args.arg1(), args.arg(2), args.arg(3), args.arg(4));
}
}
}