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 "FunctionPrototype.h"
25 #include "JSFunction.h"
26 #include "JSGlobalObject.h"
27 #include "JSString.h"
28 #include "Parser.h"
29 #include "Debugger.h"
30 #include "Lexer.h"
31 #include "Nodes.h"
32
33 namespace JSC {
34
35 ASSERT_CLASS_FITS_IN_CELL(FunctionConstructor);
36
FunctionConstructor(ExecState * exec,PassRefPtr<Structure> structure,FunctionPrototype * functionPrototype)37 FunctionConstructor::FunctionConstructor(ExecState* exec, PassRefPtr<Structure> structure, FunctionPrototype* functionPrototype)
38 : InternalFunction(&exec->globalData(), structure, Identifier(exec, functionPrototype->classInfo()->className))
39 {
40 putDirectWithoutTransition(exec->propertyNames().prototype, functionPrototype, DontEnum | DontDelete | ReadOnly);
41
42 // Number of arguments for constructor
43 putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontDelete | DontEnum);
44 }
45
constructWithFunctionConstructor(ExecState * exec,JSObject *,const ArgList & args)46 static JSObject* constructWithFunctionConstructor(ExecState* exec, JSObject*, const ArgList& args)
47 {
48 return constructFunction(exec, args);
49 }
50
getConstructData(ConstructData & constructData)51 ConstructType FunctionConstructor::getConstructData(ConstructData& constructData)
52 {
53 constructData.native.function = constructWithFunctionConstructor;
54 return ConstructTypeHost;
55 }
56
callFunctionConstructor(ExecState * exec,JSObject *,JSValuePtr,const ArgList & args)57 static JSValuePtr callFunctionConstructor(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
58 {
59 return constructFunction(exec, args);
60 }
61
62 // ECMA 15.3.1 The Function Constructor Called as a Function
getCallData(CallData & callData)63 CallType FunctionConstructor::getCallData(CallData& callData)
64 {
65 callData.native.function = callFunctionConstructor;
66 return CallTypeHost;
67 }
68
extractFunctionBody(ProgramNode * program)69 FunctionBodyNode* extractFunctionBody(ProgramNode* program)
70 {
71 if (!program)
72 return 0;
73
74 StatementVector& children = program->children();
75 if (children.size() != 1)
76 return 0;
77
78 ExprStatementNode* exprStatement = static_cast<ExprStatementNode*>(children[0].get());
79 ASSERT(exprStatement->isExprStatement());
80 if (!exprStatement || !exprStatement->isExprStatement())
81 return 0;
82
83 FuncExprNode* funcExpr = static_cast<FuncExprNode*>(exprStatement->expr());
84 ASSERT(funcExpr->isFuncExprNode());
85 if (!funcExpr || !funcExpr->isFuncExprNode())
86 return 0;
87
88 FunctionBodyNode* body = funcExpr->body();
89 ASSERT(body);
90 return body;
91 }
92
93 // ECMA 15.3.2 The Function Constructor
constructFunction(ExecState * exec,const ArgList & args,const Identifier & functionName,const UString & sourceURL,int lineNumber)94 JSObject* constructFunction(ExecState* exec, const ArgList& args, const Identifier& functionName, const UString& sourceURL, int lineNumber)
95 {
96 UString program;
97 if (args.isEmpty())
98 program = "(function(){})";
99 else if (args.size() == 1)
100 program = "(function(){" + args.at(exec, 0).toString(exec) + "})";
101 else {
102 program = "(function(" + args.at(exec, 0).toString(exec);
103 for (size_t i = 1; i < args.size() - 1; i++)
104 program += "," + args.at(exec, i).toString(exec);
105 program += "){" + args.at(exec, args.size() - 1).toString(exec) + "})";
106 }
107
108 int errLine;
109 UString errMsg;
110 SourceCode source = makeSource(program, sourceURL, lineNumber);
111 RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(exec, exec->dynamicGlobalObject()->debugger(), source, &errLine, &errMsg);
112
113 FunctionBodyNode* body = extractFunctionBody(programNode.get());
114 if (!body)
115 return throwError(exec, SyntaxError, errMsg, errLine, source.provider()->asID(), source.provider()->url());
116
117 JSGlobalObject* globalObject = exec->lexicalGlobalObject();
118 ScopeChain scopeChain(globalObject, globalObject->globalData(), exec->globalThisValue());
119 return new (exec) JSFunction(exec, functionName, body, scopeChain.node());
120 }
121
122 // ECMA 15.3.2 The Function Constructor
constructFunction(ExecState * exec,const ArgList & args)123 JSObject* constructFunction(ExecState* exec, const ArgList& args)
124 {
125 return constructFunction(exec, args, Identifier(exec, "anonymous"), UString(), 1);
126 }
127
128 } // namespace JSC
129