kjs/bool_object.cpp

   1 // -*- c-basic-offset: 2 -*-
   2 /*
   3  *  This file is part of the KDE libraries
   4  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   5  *  Copyright (C) 2003 Apple Computer, Inc.
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Lesser General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 2 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Lesser General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Lesser General Public
  18  *  License along with this library; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  20  *
  21  */
  22
  23 #include "bool_object.h"
  24 #include <config.h>
  25
  26 #include "operations.h"
  27 #include "error_object.h"
  28
  29 using namespace KJS;
  30
  31 // ------------------------------ BooleanInstance ---------------------------
  32
  33 const ClassInfo BooleanInstance::info = {"Boolean", 0, 0, 0};
  34
  35 BooleanInstance::BooleanInstance(JSObject *proto)
  36   : JSWrapperObject(proto)
  37 {
  38 }
  39
  40 // ------------------------------ BooleanPrototype --------------------------
  41
  42 // ECMA 15.6.4
  43
  44 BooleanPrototype::BooleanPrototype(ExecState* exec, ObjectPrototype* objectProto, FunctionPrototype* funcProto)
  45   : BooleanInstance(objectProto)
  46 {
  47   // The constructor will be added later by Interpreter::Interpreter()
  48
  49   putDirectFunction(new BooleanProtoFunc(exec, funcProto, BooleanProtoFunc::ToString, 0, exec->propertyNames().toString), DontEnum);
  50   putDirectFunction(new BooleanProtoFunc(exec, funcProto, BooleanProtoFunc::ValueOf, 0, exec->propertyNames().valueOf),  DontEnum);
  51   setInternalValue(jsBoolean(false));
  52 }
  53
  54
  55 // ------------------------------ BooleanProtoFunc --------------------------
  56
  57 BooleanProtoFunc::BooleanProtoFunc(ExecState* exec, FunctionPrototype* funcProto, int i, int len, const Identifier& name)
  58   : InternalFunctionImp(funcProto, name)
  59   , id(i)
  60 {
  61   putDirect(exec->propertyNames().length, len, DontDelete|ReadOnly|DontEnum);
  62 }
  63
  64
  65 // ECMA 15.6.4.2 + 15.6.4.3
  66 JSValue *BooleanProtoFunc::callAsFunction(ExecState* exec, JSObject *thisObj, const List &/*args*/)
  67 {
  68   // no generic function. "this" has to be a Boolean object
  69   if (!thisObj->inherits(&BooleanInstance::info))
  70     return throwError(exec, TypeError);
  71
  72   // execute "toString()" or "valueOf()", respectively
  73
  74   JSValue *v = static_cast<BooleanInstance*>(thisObj)->internalValue();
  75   assert(v);
  76
  77   if (id == ToString)
  78     return jsString(v->toString(exec));
  79   return jsBoolean(v->toBoolean(exec)); /* TODO: optimize for bool case */
  80 }
  81
  82 // ------------------------------ BooleanObjectImp -----------------------------
  83
  84
  85 BooleanObjectImp::BooleanObjectImp(ExecState* exec, FunctionPrototype* funcProto, BooleanPrototype* booleanProto)
  86   : InternalFunctionImp(funcProto)
  87 {
  88   putDirect(exec->propertyNames().prototype, booleanProto, DontEnum|DontDelete|ReadOnly);
  89
  90   // no. of arguments for constructor
  91   putDirect(exec->propertyNames().length, jsNumber(1), ReadOnly|DontDelete|DontEnum);
  92 }
  93
  94
  95 bool BooleanObjectImp::implementsConstruct() const
  96 {
  97   return true;
  98 }
  99
 100 // ECMA 15.6.2
 101 JSObject *BooleanObjectImp::construct(ExecState *exec, const List &args)
 102 {
 103   BooleanInstance *obj(new BooleanInstance(exec->lexicalInterpreter()->builtinBooleanPrototype()));
 104
 105   bool b;
 106   if (args.size() > 0)
 107     b = args.begin()->toBoolean(exec);
 108   else
 109     b = false;
 110
 111   obj->setInternalValue(jsBoolean(b));
 112
 113   return obj;
 114 }
 115
 116 // ECMA 15.6.1
 117 JSValue *BooleanObjectImp::callAsFunction(ExecState *exec, JSObject * /*thisObj*/, const List &args)
 118 {
 119   if (args.isEmpty())
 120     return jsBoolean(false);
 121   else
 122     return jsBoolean(args[0]->toBoolean(exec)); /* TODO: optimize for bool case */
 123 }
 124