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      1 /*
      2  *  Copyright (C) 1999-2001 Harri Porten (porten (at) kde.org)
      3  *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
      4  *
      5  *  This library is free software; you can redistribute it and/or
      6  *  modify it under the terms of the GNU Lesser General Public
      7  *  License as published by the Free Software Foundation; either
      8  *  version 2 of the License, or (at your option) any later version.
      9  *
     10  *  This library is distributed in the hope that it will be useful,
     11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  *  Lesser General Public License for more details.
     14  *
     15  *  You should have received a copy of the GNU Lesser General Public
     16  *  License along with this library; if not, write to the Free Software
     17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
     18  *
     19  */
     20 
     21 #include "config.h"
     22 #include "FunctionConstructor.h"
     23 
     24 #include "Debugger.h"
     25 #include "FunctionPrototype.h"
     26 #include "JSFunction.h"
     27 #include "JSGlobalObject.h"
     28 #include "JSString.h"
     29 #include "Lexer.h"
     30 #include "Nodes.h"
     31 #include "Parser.h"
     32 #include "StringBuilder.h"
     33 
     34 namespace JSC {
     35 
     36 ASSERT_CLASS_FITS_IN_CELL(FunctionConstructor);
     37 
     38 FunctionConstructor::FunctionConstructor(ExecState* exec, NonNullPassRefPtr<Structure> structure, FunctionPrototype* functionPrototype)
     39     : InternalFunction(&exec->globalData(), structure, Identifier(exec, functionPrototype->classInfo()->className))
     40 {
     41     putDirectWithoutTransition(exec->propertyNames().prototype, functionPrototype, DontEnum | DontDelete | ReadOnly);
     42 
     43     // Number of arguments for constructor
     44     putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontDelete | DontEnum);
     45 }
     46 
     47 static JSObject* constructWithFunctionConstructor(ExecState* exec, JSObject*, const ArgList& args)
     48 {
     49     return constructFunction(exec, args);
     50 }
     51 
     52 ConstructType FunctionConstructor::getConstructData(ConstructData& constructData)
     53 {
     54     constructData.native.function = constructWithFunctionConstructor;
     55     return ConstructTypeHost;
     56 }
     57 
     58 static JSValue JSC_HOST_CALL callFunctionConstructor(ExecState* exec, JSObject*, JSValue, const ArgList& args)
     59 {
     60     return constructFunction(exec, args);
     61 }
     62 
     63 // ECMA 15.3.1 The Function Constructor Called as a Function
     64 CallType FunctionConstructor::getCallData(CallData& callData)
     65 {
     66     callData.native.function = callFunctionConstructor;
     67     return CallTypeHost;
     68 }
     69 
     70 // ECMA 15.3.2 The Function Constructor
     71 JSObject* constructFunction(ExecState* exec, const ArgList& args, const Identifier& functionName, const UString& sourceURL, int lineNumber)
     72 {
     73     // Functions need to have a space following the opening { due to for web compatibility
     74     // see https://bugs.webkit.org/show_bug.cgi?id=24350
     75     // We also need \n before the closing } to handle // comments at the end of the last line
     76     UString program;
     77     if (args.isEmpty())
     78         program = "(function() { \n})";
     79     else if (args.size() == 1)
     80         program = makeString("(function() { ", args.at(0).toString(exec), "\n})");
     81     else {
     82         StringBuilder builder;
     83         builder.append("(function(");
     84         builder.append(args.at(0).toString(exec));
     85         for (size_t i = 1; i < args.size() - 1; i++) {
     86             builder.append(",");
     87             builder.append(args.at(i).toString(exec));
     88         }
     89         builder.append(") { ");
     90         builder.append(args.at(args.size() - 1).toString(exec));
     91         builder.append("\n})");
     92         program = builder.build();
     93     }
     94 
     95     int errLine;
     96     UString errMsg;
     97     SourceCode source = makeSource(program, sourceURL, lineNumber);
     98     RefPtr<FunctionExecutable> function = FunctionExecutable::fromGlobalCode(functionName, exec, exec->dynamicGlobalObject()->debugger(), source, &errLine, &errMsg);
     99     if (!function)
    100         return throwError(exec, SyntaxError, errMsg, errLine, source.provider()->asID(), source.provider()->url());
    101 
    102     JSGlobalObject* globalObject = exec->lexicalGlobalObject();
    103     ScopeChain scopeChain(globalObject, globalObject->globalData(), globalObject, exec->globalThisValue());
    104     return new (exec) JSFunction(exec, function, scopeChain.node());
    105 }
    106 
    107 // ECMA 15.3.2 The Function Constructor
    108 JSObject* constructFunction(ExecState* exec, const ArgList& args)
    109 {
    110     return constructFunction(exec, args, Identifier(exec, "anonymous"), UString(), 1);
    111 }
    112 
    113 } // namespace JSC
    114