runtime/FunctionConstructor.cpp

   1 /*
   2  *  Copyright (C) 1999-2001 Harri Porten (porten@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.release();
  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