JavaScriptCore/kjs/function_object.cpp - WebKit - Git at Google

 /*
  *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
  *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public
  *  License along with this library; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  *
  */

 #include "config.h"
 #include "function_object.h"

 #include "JSGlobalObject.h"
 #include "Parser.h"
 #include "array_object.h"
 #include "debugger.h"
 #include "function.h"
 #include "internal.h"
 #include "lexer.h"
 #include "nodes.h"
 #include "object.h"
 #include <stdio.h>
 #include <string.h>
 #include <wtf/Assertions.h>

 namespace KJS {

 // ------------------------------ FunctionPrototype -------------------------

 static JSValue* functionProtoFuncToString(ExecState*, JSObject*, const List&);
 static JSValue* functionProtoFuncApply(ExecState*, JSObject*, const List&);
 static JSValue* functionProtoFuncCall(ExecState*, JSObject*, const List&);

 FunctionPrototype::FunctionPrototype(ExecState* exec)
 {
     putDirect(exec->propertyNames().length, jsNumber(0), DontDelete | ReadOnly | DontEnum);

     putDirectFunction(new PrototypeFunction(exec, this, 0, exec->propertyNames().toString, functionProtoFuncToString), DontEnum);
     putDirectFunction(new PrototypeFunction(exec, this, 2, exec->propertyNames().apply, functionProtoFuncApply), DontEnum);
     putDirectFunction(new PrototypeFunction(exec, this, 1, exec->propertyNames().call, functionProtoFuncCall), DontEnum);
 }

 // ECMA 15.3.4
 JSValue* FunctionPrototype::callAsFunction(ExecState*, JSObject*, const List&)
 {
     return jsUndefined();
 }

 // Functions

 JSValue* functionProtoFuncToString(ExecState* exec, JSObject* thisObj, const List&)
 {
     if (!thisObj || !thisObj->inherits(&InternalFunction::info)) {
 #ifndef NDEBUG
         fprintf(stderr,"attempted toString() call on null or non-function object\n");
 #endif
         return throwError(exec, TypeError);
     }

     if (thisObj->inherits(&JSFunction::info)) {
         JSFunction* fi = static_cast<JSFunction*>(thisObj);
         return jsString("function " + fi->functionName().ustring() + "(" + fi->body->paramString() + ") " + fi->body->toSourceString());
     }

     return jsString("function " + static_cast<InternalFunction*>(thisObj)->functionName().ustring() + "() {\n    [native code]\n}");
 }

 JSValue* functionProtoFuncApply(ExecState* exec, JSObject* thisObj, const List& args)
 {
     if (!thisObj->implementsCall())
         return throwError(exec, TypeError);

     JSValue* thisArg = args[0];
     JSValue* argArray = args[1];

     JSObject* applyThis;
     if (thisArg->isUndefinedOrNull())
         applyThis = exec->globalThisValue();
     else
         applyThis = thisArg->toObject(exec);

     List applyArgs;
     if (!argArray->isUndefinedOrNull()) {
         if (argArray->isObject() &&
             (static_cast<JSObject*>(argArray)->inherits(&JSArray::info) ||
              static_cast<JSObject*>(argArray)->inherits(&Arguments::info))) {

             JSObject* argArrayObj = static_cast<JSObject*>(argArray);
             unsigned int length = argArrayObj->get(exec, exec->propertyNames().length)->toUInt32(exec);
             for (unsigned int i = 0; i < length; i++)
                 applyArgs.append(argArrayObj->get(exec, i));
         } else
             return throwError(exec, TypeError);
     }

     return thisObj->callAsFunction(exec, applyThis, applyArgs);
 }

 JSValue* functionProtoFuncCall(ExecState* exec, JSObject* thisObj, const List& args)
 {
     if (!thisObj->implementsCall())
         return throwError(exec, TypeError);

     JSValue* thisArg = args[0];

     JSObject* callThis;
     if (thisArg->isUndefinedOrNull())
         callThis = exec->globalThisValue();
     else
         callThis = thisArg->toObject(exec);

     List argsTail;
     args.getSlice(1, argsTail);
     return thisObj->callAsFunction(exec, callThis, argsTail);
 }

 // ------------------------------ FunctionConstructor ----------------------------

 FunctionConstructor::FunctionConstructor(ExecState* exec, FunctionPrototype* functionPrototype)
     : InternalFunction(functionPrototype, functionPrototype->classInfo()->className)
 {
     putDirect(exec->propertyNames().prototype, functionPrototype, DontEnum | DontDelete | ReadOnly);

     // Number of arguments for constructor
     putDirect(exec->propertyNames().length, jsNumber(1), ReadOnly | DontDelete | DontEnum);
 }

 ConstructType FunctionConstructor::getConstructData(ConstructData&)
 {
     return ConstructTypeNative;
 }

 // ECMA 15.3.2 The Function Constructor
 JSObject* FunctionConstructor::construct(ExecState* exec, const List& args, const Identifier& functionName, const UString& sourceURL, int lineNumber)
 {
     UString p("");
     UString body;
     int argsSize = args.size();
     if (argsSize == 0)
         body = "";
     else if (argsSize == 1)
         body = args[0]->toString(exec);
     else {
         p = args[0]->toString(exec);
         for (int k = 1; k < argsSize - 1; k++)
             p += "," + args[k]->toString(exec);
         body = args[argsSize - 1]->toString(exec);
     }

     // parse the source code
     int sourceId;
     int errLine;
     UString errMsg;
     RefPtr<SourceProvider> source = UStringSourceProvider::create(body);
     RefPtr<FunctionBodyNode> functionBody = exec->parser()->parse<FunctionBodyNode>(exec, sourceURL, lineNumber, source, &sourceId, &errLine, &errMsg);

     // No program node == syntax error - throw a syntax error
     if (!functionBody)
         // We can't return a Completion(Throw) here, so just set the exception
         // and return it
         return throwError(exec, SyntaxError, errMsg, errLine, sourceId, sourceURL);

     functionBody->setSource(SourceRange(source, 0, source->length()));
     ScopeChain scopeChain(exec->lexicalGlobalObject(), exec->globalThisValue());

     JSFunction* fimp = new JSFunction(exec, functionName, functionBody.get(), scopeChain.node());

     // parse parameter list. throw syntax error on illegal identifiers
     int len = p.size();
     const UChar* c = p.data();
     int i = 0, params = 0;
     UString param;
     while (i < len) {
         while (*c == ' ' && i < len)
             c++, i++;
         if (Lexer::isIdentStart(c[0])) {  // else error
             param = UString(c, 1);
             c++, i++;
             while (i < len && (Lexer::isIdentPart(c[0]))) {
                 param += UString(c, 1);
                 c++, i++;
             }
             while (i < len && *c == ' ')
                 c++, i++;
             if (i == len) {
                 functionBody->parameters().append(Identifier(param));
                 params++;
                 break;
             } else if (*c == ',') {
                 functionBody->parameters().append(Identifier(param));
                 params++;
                 c++, i++;
                 continue;
             } // else error
         }
         return throwError(exec, SyntaxError, "Syntax error in parameter list");
     }

     JSObject* objCons = exec->lexicalGlobalObject()->objectConstructor();
     JSObject* prototype = objCons->construct(exec, exec->emptyList());
     prototype->putDirect(exec->propertyNames().constructor, fimp, DontEnum);
     fimp->putDirect(exec->propertyNames().prototype, prototype, DontDelete);
     return fimp;
 }

 // ECMA 15.3.2 The Function Constructor
 JSObject* FunctionConstructor::construct(ExecState* exec, const List& args)
 {
     return construct(exec, args, "anonymous", UString(), 1);
 }

 // ECMA 15.3.1 The Function Constructor Called as a Function
 JSValue* FunctionConstructor::callAsFunction(ExecState* exec, JSObject*, const List& args)
 {
     return construct(exec, args);
 }

 } // namespace KJS
	/*
	* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
	* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*
	*/

	#include "config.h"
	#include "function_object.h"

	#include "JSGlobalObject.h"
	#include "Parser.h"
	#include "array_object.h"
	#include "debugger.h"
	#include "function.h"
	#include "internal.h"
	#include "lexer.h"
	#include "nodes.h"
	#include "object.h"
	#include <stdio.h>
	#include <string.h>
	#include <wtf/Assertions.h>

	namespace KJS {

	// ------------------------------ FunctionPrototype -------------------------

	static JSValue* functionProtoFuncToString(ExecState, JSObject, const List&);
	static JSValue* functionProtoFuncApply(ExecState, JSObject, const List&);
	static JSValue* functionProtoFuncCall(ExecState, JSObject, const List&);

	FunctionPrototype::FunctionPrototype(ExecState* exec)
	{
	putDirect(exec->propertyNames().length, jsNumber(0), DontDelete \| ReadOnly \| DontEnum);

	putDirectFunction(new PrototypeFunction(exec, this, 0, exec->propertyNames().toString, functionProtoFuncToString), DontEnum);
	putDirectFunction(new PrototypeFunction(exec, this, 2, exec->propertyNames().apply, functionProtoFuncApply), DontEnum);
	putDirectFunction(new PrototypeFunction(exec, this, 1, exec->propertyNames().call, functionProtoFuncCall), DontEnum);
	}

	// ECMA 15.3.4
	JSValue* FunctionPrototype::callAsFunction(ExecState, JSObject, const List&)
	{
	return jsUndefined();
	}

	// Functions

	JSValue* functionProtoFuncToString(ExecState* exec, JSObject* thisObj, const List&)
	{
	if (!thisObj \|\| !thisObj->inherits(&InternalFunction::info)) {
	#ifndef NDEBUG
	fprintf(stderr,"attempted toString() call on null or non-function object\n");
	#endif
	return throwError(exec, TypeError);
	}

	if (thisObj->inherits(&JSFunction::info)) {
	JSFunction* fi = static_cast<JSFunction*>(thisObj);
	return jsString("function " + fi->functionName().ustring() + "(" + fi->body->paramString() + ") " + fi->body->toSourceString());
	}

	return jsString("function " + static_cast<InternalFunction*>(thisObj)->functionName().ustring() + "() {\n [native code]\n}");
	}

	JSValue* functionProtoFuncApply(ExecState* exec, JSObject* thisObj, const List& args)
	{
	if (!thisObj->implementsCall())
	return throwError(exec, TypeError);

	JSValue* thisArg = args[0];
	JSValue* argArray = args[1];

	JSObject* applyThis;
	if (thisArg->isUndefinedOrNull())
	applyThis = exec->globalThisValue();
	else
	applyThis = thisArg->toObject(exec);

	List applyArgs;
	if (!argArray->isUndefinedOrNull()) {
	if (argArray->isObject() &&
	(static_cast<JSObject*>(argArray)->inherits(&JSArray::info) \|\|
	static_cast<JSObject*>(argArray)->inherits(&Arguments::info))) {

	JSObject* argArrayObj = static_cast<JSObject*>(argArray);
	unsigned int length = argArrayObj->get(exec, exec->propertyNames().length)->toUInt32(exec);
	for (unsigned int i = 0; i < length; i++)
	applyArgs.append(argArrayObj->get(exec, i));
	} else
	return throwError(exec, TypeError);
	}

	return thisObj->callAsFunction(exec, applyThis, applyArgs);
	}

	JSValue* functionProtoFuncCall(ExecState* exec, JSObject* thisObj, const List& args)
	{
	if (!thisObj->implementsCall())
	return throwError(exec, TypeError);

	JSValue* thisArg = args[0];

	JSObject* callThis;
	if (thisArg->isUndefinedOrNull())
	callThis = exec->globalThisValue();
	else
	callThis = thisArg->toObject(exec);

	List argsTail;
	args.getSlice(1, argsTail);
	return thisObj->callAsFunction(exec, callThis, argsTail);
	}

	// ------------------------------ FunctionConstructor ----------------------------

	FunctionConstructor::FunctionConstructor(ExecState* exec, FunctionPrototype* functionPrototype)
	: InternalFunction(functionPrototype, functionPrototype->classInfo()->className)
	{
	putDirect(exec->propertyNames().prototype, functionPrototype, DontEnum \| DontDelete \| ReadOnly);

	// Number of arguments for constructor
	putDirect(exec->propertyNames().length, jsNumber(1), ReadOnly \| DontDelete \| DontEnum);
	}

	ConstructType FunctionConstructor::getConstructData(ConstructData&)
	{
	return ConstructTypeNative;
	}

	// ECMA 15.3.2 The Function Constructor
	JSObject* FunctionConstructor::construct(ExecState* exec, const List& args, const Identifier& functionName, const UString& sourceURL, int lineNumber)
	{
	UString p("");
	UString body;
	int argsSize = args.size();
	if (argsSize == 0)
	body = "";
	else if (argsSize == 1)
	body = args[0]->toString(exec);
	else {
	p = args[0]->toString(exec);
	for (int k = 1; k < argsSize - 1; k++)
	p += "," + args[k]->toString(exec);
	body = args[argsSize - 1]->toString(exec);
	}

	// parse the source code
	int sourceId;
	int errLine;
	UString errMsg;
	RefPtr<SourceProvider> source = UStringSourceProvider::create(body);
	RefPtr<FunctionBodyNode> functionBody = exec->parser()->parse<FunctionBodyNode>(exec, sourceURL, lineNumber, source, &sourceId, &errLine, &errMsg);

	// No program node == syntax error - throw a syntax error
	if (!functionBody)
	// We can't return a Completion(Throw) here, so just set the exception
	// and return it
	return throwError(exec, SyntaxError, errMsg, errLine, sourceId, sourceURL);

	functionBody->setSource(SourceRange(source, 0, source->length()));
	ScopeChain scopeChain(exec->lexicalGlobalObject(), exec->globalThisValue());

	JSFunction* fimp = new JSFunction(exec, functionName, functionBody.get(), scopeChain.node());

	// parse parameter list. throw syntax error on illegal identifiers
	int len = p.size();
	const UChar* c = p.data();
	int i = 0, params = 0;
	UString param;
	while (i < len) {
	while (*c == ' ' && i < len)
	c++, i++;
	if (Lexer::isIdentStart(c[0])) { // else error
	param = UString(c, 1);
	c++, i++;
	while (i < len && (Lexer::isIdentPart(c[0]))) {
	param += UString(c, 1);
	c++, i++;
	}
	while (i < len && *c == ' ')
	c++, i++;
	if (i == len) {
	functionBody->parameters().append(Identifier(param));
	params++;
	break;
	} else if (*c == ',') {
	functionBody->parameters().append(Identifier(param));
	params++;
	c++, i++;
	continue;
	} // else error
	}
	return throwError(exec, SyntaxError, "Syntax error in parameter list");
	}

	JSObject* objCons = exec->lexicalGlobalObject()->objectConstructor();
	JSObject* prototype = objCons->construct(exec, exec->emptyList());
	prototype->putDirect(exec->propertyNames().constructor, fimp, DontEnum);
	fimp->putDirect(exec->propertyNames().prototype, prototype, DontDelete);
	return fimp;
	}

	// ECMA 15.3.2 The Function Constructor
	JSObject* FunctionConstructor::construct(ExecState* exec, const List& args)
	{
	return construct(exec, args, "anonymous", UString(), 1);
	}

	// ECMA 15.3.1 The Function Constructor Called as a Function
	JSValue* FunctionConstructor::callAsFunction(ExecState* exec, JSObject*, const List& args)
	{
	return construct(exec, args);
	}

	} // namespace KJS