JavaScriptCore-521.tar.gz

[apple/javascriptcore.git] / runtime / FunctionConstructor.cpp

diff --git a/runtime/FunctionConstructor.cpp b/runtime/FunctionConstructor.cpp
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+/*
+ *  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 "FunctionConstructor.h"
+
+#include "FunctionPrototype.h"
+#include "JSFunction.h"
+#include "JSGlobalObject.h"
+#include "JSString.h"
+#include "Parser.h"
+#include "Debugger.h"
+#include "Lexer.h"
+#include "Nodes.h"
+
+namespace JSC {
+
+ASSERT_CLASS_FITS_IN_CELL(FunctionConstructor);
+
+FunctionConstructor::FunctionConstructor(ExecState* exec, PassRefPtr<Structure> structure, FunctionPrototype* functionPrototype)
+    : InternalFunction(&exec->globalData(), structure, Identifier(exec, functionPrototype->classInfo()->className))
+{
+    putDirectWithoutTransition(exec->propertyNames().prototype, functionPrototype, DontEnum | DontDelete | ReadOnly);
+
+    // Number of arguments for constructor
+    putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontDelete | DontEnum);
+}
+
+static JSObject* constructWithFunctionConstructor(ExecState* exec, JSObject*, const ArgList& args)
+{
+    return constructFunction(exec, args);
+}
+
+ConstructType FunctionConstructor::getConstructData(ConstructData& constructData)
+{
+    constructData.native.function = constructWithFunctionConstructor;
+    return ConstructTypeHost;
+}
+
+static JSValuePtr callFunctionConstructor(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
+{
+    return constructFunction(exec, args);
+}
+
+// ECMA 15.3.1 The Function Constructor Called as a Function
+CallType FunctionConstructor::getCallData(CallData& callData)
+{
+    callData.native.function = callFunctionConstructor;
+    return CallTypeHost;
+}
+
+FunctionBodyNode* extractFunctionBody(ProgramNode* program)
+{
+    if (!program)
+        return 0;
+
+    StatementVector& children = program->children();
+    if (children.size() != 1)
+        return 0;
+
+    ExprStatementNode* exprStatement = static_cast<ExprStatementNode*>(children[0].get()); 
+    ASSERT(exprStatement->isExprStatement());
+    if (!exprStatement || !exprStatement->isExprStatement())
+        return 0;
+
+    FuncExprNode* funcExpr = static_cast<FuncExprNode*>(exprStatement->expr());
+    ASSERT(funcExpr->isFuncExprNode());
+    if (!funcExpr || !funcExpr->isFuncExprNode())
+        return 0;
+
+    FunctionBodyNode* body = funcExpr->body();
+    ASSERT(body);
+    return body;
+}
+
+// ECMA 15.3.2 The Function Constructor
+JSObject* constructFunction(ExecState* exec, const ArgList& args, const Identifier& functionName, const UString& sourceURL, int lineNumber)
+{
+    // Functions need to have a space following the opening { due to for web compatibility
+    // see https://bugs.webkit.org/show_bug.cgi?id=24350
+    // We also need \n before the closing } to handle // comments at the end of the last line
+    UString program;
+    if (args.isEmpty())
+        program = "(function() { \n})";
+    else if (args.size() == 1)
+        program = "(function() { " + args.at(exec, 0).toString(exec) + "\n})";
+    else {
+        program = "(function(" + args.at(exec, 0).toString(exec);
+        for (size_t i = 1; i < args.size() - 1; i++)
+            program += "," + args.at(exec, i).toString(exec);
+        program += ") { " + args.at(exec, args.size() - 1).toString(exec) + "\n})";
+    }
+
+    int errLine;
+    UString errMsg;
+    SourceCode source = makeSource(program, sourceURL, lineNumber);
+    RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(exec, exec->dynamicGlobalObject()->debugger(), source, &errLine, &errMsg);
+
+    FunctionBodyNode* body = extractFunctionBody(programNode.get());
+    if (!body)
+        return throwError(exec, SyntaxError, errMsg, errLine, source.provider()->asID(), source.provider()->url());
+
+    JSGlobalObject* globalObject = exec->lexicalGlobalObject();
+    ScopeChain scopeChain(globalObject, globalObject->globalData(), exec->globalThisValue());
+    return new (exec) JSFunction(exec, functionName, body, scopeChain.node());
+}
+
+// ECMA 15.3.2 The Function Constructor
+JSObject* constructFunction(ExecState* exec, const ArgList& args)
+{
+    return constructFunction(exec, args, Identifier(exec, "anonymous"), UString(), 1);
+}
+
+} // namespace JSC