зеркало из https://github.com/mozilla/gecko-dev.git
435 строки
15 KiB
C++
435 строки
15 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is the JavaScript 2 Prototype.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU Public License (the "GPL"), in which case the
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* provisions of the GPL are applicable instead of those above.
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* If you wish to allow use of your version of this file only
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* under the terms of the GPL and not to allow others to use your
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* version of this file under the NPL, indicate your decision by
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* deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete
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* the provisions above, a recipient may use your version of this
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* file under either the NPL or the GPL.
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*/
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#ifndef jstypes_h
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#define jstypes_h
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#include "utilities.h"
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#include "gc_allocator.h"
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#include <vector>
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#include <map>
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#include <stack>
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/* forward declare classes from JavaScript::ICG */
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namespace JavaScript {
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namespace ICG {
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class ICodeModule;
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} /* namespace ICG */
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} /* namespace JavaScript */
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namespace JavaScript {
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namespace JSTypes {
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using ICG::ICodeModule;
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class JSObject;
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class JSArray;
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class JSFunction;
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class JSString;
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class JSType;
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/**
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* All JavaScript data types.
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*/
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struct JSValue {
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union {
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int8 i8;
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uint8 u8;
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int16 i16;
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uint16 u16;
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int32 i32;
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uint32 u32;
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int64 i64;
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uint64 u64;
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float32 f32;
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float64 f64;
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JSObject* object;
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JSArray* array;
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JSFunction *function;
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JSString *string;
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JSType *type;
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bool boolean;
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};
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/* These are the ECMA types, for use in 'toPrimitive' calls */
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enum ECMA_type {
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Undefined, Null, Boolean, Number, Object, String,
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NoHint
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};
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enum {
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i8_tag, u8_tag,
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i16_tag, u16_tag,
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i32_tag, u32_tag,
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i64_tag, u64_tag,
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f32_tag, f64_tag,
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object_tag, array_tag, function_tag, string_tag, boolean_tag, type_tag,
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undefined_tag
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} tag;
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JSValue() : f64(0.0), tag(undefined_tag) {}
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explicit JSValue(int32 i32) : i32(i32), tag(i32_tag) {}
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explicit JSValue(uint32 u32) : u32(u32), tag(u32_tag) {}
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explicit JSValue(float64 f64) : f64(f64), tag(f64_tag) {}
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explicit JSValue(JSObject* object) : object(object), tag(object_tag) {}
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explicit JSValue(JSArray* array) : array(array), tag(array_tag) {}
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explicit JSValue(JSFunction* function) : function(function), tag(function_tag) {}
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explicit JSValue(JSString* string) : string(string), tag(string_tag) {}
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explicit JSValue(bool boolean) : boolean(boolean), tag(boolean_tag) {}
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explicit JSValue(JSType* type) : type(type), tag(type_tag) {}
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int32& operator=(int32 i32) { return (tag = i32_tag, this->i32 = i32); }
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uint32& operator=(uint32 u32) { return (tag = u32_tag, this->u32 = u32); }
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float64& operator=(float64 f64) { return (tag = f64_tag, this->f64 = f64); }
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JSObject*& operator=(JSObject* object) { return (tag = object_tag, this->object = object); }
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JSArray*& operator=(JSArray* array) { return (tag = array_tag, this->array = array); }
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JSFunction*& operator=(JSFunction* function) { return (tag = function_tag, this->function = function); }
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JSString*& operator=(JSString* string) { return (tag = string_tag, this->string = string); }
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bool& operator=(bool boolean) { return (tag = boolean_tag, this->boolean = boolean); }
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JSType*& operator=(JSType* type) { return (tag = type_tag, this->type = type); }
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bool isFunction() const { return (tag == function_tag); }
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bool isObject() const { return ((tag == object_tag) || (tag == function_tag) || (tag == array_tag)); }
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bool isString() const { return (tag == string_tag); }
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bool isBoolean() const { return (tag == boolean_tag); }
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bool isNumber() const { return (tag == f64_tag); }
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/* this is correct wrt ECMA, The i32 & u32 kinds
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will have to be converted to doubles anyway because
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we can't have overflow happening in generic arithmetic */
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bool isUndefined() const { return (tag == undefined_tag); }
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bool isNull() const { return ((tag == object_tag) && (this->object == NULL)); }
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bool isNaN() const;
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JSValue toString() const { return (isString() ? *this : valueToString(*this)); }
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JSValue toNumber() const { return (isNumber() ? *this : valueToNumber(*this)); }
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JSValue toInt32() const { return ((tag == i32_tag) ? *this : valueToInt32(*this)); }
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JSValue toUInt32() const { return ((tag == u32_tag) ? *this : valueToUInt32(*this)); }
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JSValue toBoolean() const { return ((tag == boolean_tag) ? *this : valueToBoolean(*this)); }
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JSValue toPrimitive(ECMA_type hint = NoHint) const;
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static JSValue valueToString(const JSValue& value);
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static JSValue valueToNumber(const JSValue& value);
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static JSValue valueToInt32(const JSValue& value);
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static JSValue valueToUInt32(const JSValue& value);
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static JSValue valueToBoolean(const JSValue& value);
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const JSType *getType() const;
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int operator==(const JSValue& value) const;
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};
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Formatter& operator<<(Formatter& f, const JSValue& value);
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#if defined(XP_MAC)
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// copied from default template parameters in map.
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typedef gc_allocator<std::pair<const String, JSValue> > gc_map_allocator;
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#elif defined(XP_UNIX)
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// FIXME: in libg++, they assume the map's allocator is a byte allocator,
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// which is wrapped in a simple_allocator. this is crap.
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typedef char _Char[1];
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typedef gc_allocator<_Char> gc_map_allocator;
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#elif defined(_WIN32)
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// FIXME: MSVC++'s notion. this is why we had to add _Charalloc().
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typedef gc_allocator<JSValue> gc_map_allocator;
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#endif
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/**
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* GC-scannable array of values.
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*/
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typedef std::vector<JSValue, gc_allocator<JSValue> > JSValues;
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extern const JSValue kUndefinedValue;
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extern const JSValue kNaN;
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extern const JSValue kTrue;
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extern const JSValue kFalse;
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/**
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* Basic behavior of all JS objects, mapping a name to a value,
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* with prototype-based inheritance.
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*/
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class JSObject : public gc_base {
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protected:
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typedef std::map<String, JSValue, std::less<String>, gc_map_allocator> JSProperties;
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JSProperties mProperties;
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JSObject* mPrototype;
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public:
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JSObject() : mPrototype(0) {}
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bool hasProperty(const String& name)
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{
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return (mProperties.count(name) != 0);
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}
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const JSValue& getProperty(const String& name)
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{
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JSProperties::const_iterator i = mProperties.find(name);
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if (i != mProperties.end())
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return i->second;
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if (mPrototype)
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return mPrototype->getProperty(name);
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return kUndefinedValue;
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}
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JSValue& setProperty(const String& name, const JSValue& value)
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{
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return (mProperties[name] = value);
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}
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void setPrototype(JSObject* prototype)
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{
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mPrototype = prototype;
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}
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JSObject* getPrototype()
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{
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return mPrototype;
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}
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void printProperties(Formatter& f) const;
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};
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Formatter& operator<<(Formatter& f, const JSObject& obj);
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/**
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* Private representation of a JavaScript array.
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*/
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class JSArray : public JSObject {
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JSValues elements;
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public:
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JSArray() : elements(1) {}
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JSArray(uint32 size) : elements(size) {}
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JSArray(const JSValues &v) : elements(v) {}
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uint32 length()
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{
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return elements.size();
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}
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JSValue& operator[](const JSValue& index)
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{
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// for now, we can only handle f64 index values.
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uint32 n = (uint32)index.f64;
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// obviously, a sparse representation might be better.
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uint32 size = elements.size();
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if (n >= size) expand(n, size);
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return elements[n];
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}
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JSValue& operator[](uint32 n)
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{
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// obviously, a sparse representation might be better.
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uint32 size = elements.size();
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if (n >= size) expand(n, size);
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return elements[n];
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}
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void resize(uint32 size)
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{
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elements.resize(size);
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}
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private:
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void expand(uint32 n, uint32 size)
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{
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do {
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size *= 2;
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} while (n >= size);
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elements.resize(size);
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}
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};
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/**
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* Private representation of a JS function. This simply
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* holds a reference to the iCode module that is the
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* compiled code of the function.
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*/
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class JSFunction : public JSObject {
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ICodeModule* mICode;
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protected:
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JSFunction() : mICode(0) {}
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typedef JavaScript::gc_traits_finalizable<JSFunction> traits;
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typedef gc_allocator<JSFunction, traits> allocator;
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public:
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JSFunction(ICodeModule* iCode) : mICode(iCode) {}
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~JSFunction();
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void* operator new(size_t) { return allocator::allocate(1); }
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ICodeModule* getICode() { return mICode; }
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virtual bool isNative() { return false; }
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};
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class JSNativeFunction : public JSFunction {
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public:
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typedef JSValue (*JSCode)(const JSValues& argv);
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JSCode mCode;
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JSNativeFunction(JSCode code) : mCode(code) {}
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virtual bool isNative() { return true; }
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};
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class JSBinaryOperator : public JSFunction {
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public:
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typedef JSValue (*JSBinaryCode)(const JSValue& arg1, const JSValue& arg2);
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JSBinaryCode mCode;
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JSBinaryOperator(JSBinaryCode code) : mCode(code) {}
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virtual bool isNative() { return true; }
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};
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#if defined(XP_UNIX)
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// bastring.cc defines a funky operator new that assumes a byte-allocator.
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typedef string_char_traits<char16> JSCharTraits;
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typedef gc_allocator<_Char> JSStringAllocator;
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#else
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typedef std::char_traits<char16> JSCharTraits;
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typedef gc_allocator<char16> JSStringAllocator;
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#endif
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/**
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* Garbage collectable UNICODE string.
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*/
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class JSString : public std::basic_string<char16, JSCharTraits, JSStringAllocator>, public gc_base {
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public:
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JSString() {}
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explicit JSString(const String& str);
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explicit JSString(const String* str);
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explicit JSString(const char* str);
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};
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class JSException : public gc_base {
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public:
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JSException(char *mess) : value(JSValue(new JSString(mess))) { }
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JSException(JSValue v) : value(v) { }
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JSValue value;
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};
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inline Formatter& operator<<(Formatter& f, const JSString& str)
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{
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printString(f, str.begin(), str.end());
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return f;
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}
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/**
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* Provides a set of nested scopes.
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*/
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class JSScope : public JSObject {
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protected:
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JSScope* mParent;
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public:
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JSScope(JSScope* parent = 0, JSObject* prototype = 0)
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: mParent(parent)
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{
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if (prototype)
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setPrototype(prototype);
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}
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JSScope* getParent()
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{
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return mParent;
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}
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bool isDefined(const String& name)
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{
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if (hasProperty(name))
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return true;
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if (mParent)
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return mParent->isDefined(name);
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return false;
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}
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const JSValue& getVariable(const String& name)
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{
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const JSValue& ret = getProperty(name);
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if (ret.isUndefined() && mParent)
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return mParent->getVariable(name);
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return ret;
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}
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JSValue& setVariable(const String& name, const JSValue& value)
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{
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return setProperty(name, value);
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}
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JSValue& defineVariable(const String& name, const JSValue& value)
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{
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return setProperty(name, value);
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}
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JSValue& defineFunction(const String& name, ICodeModule* iCode)
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{
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JSValue value(new JSFunction(iCode));
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return defineVariable(name, value);
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}
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JSValue& defineNativeFunction(const String& name, JSNativeFunction::JSCode code)
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{
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JSValue value(new JSNativeFunction(code));
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return defineVariable(name, value);
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}
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};
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class JSType : public JSObject {
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public:
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JSType(const JSType *baseType) : baseType(baseType) { }
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const JSType *baseType;
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enum { NoRelation = 0x7FFFFFFF };
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int32 distance(const JSType *other) const;
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};
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extern const JSType Any_Type;
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extern const JSType Integer_Type;
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extern const JSType Number_Type;
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extern const JSType Character_Type;
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extern const JSType String_Type;
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extern const JSType Function_Type;
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extern const JSType Array_Type;
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extern const JSType Type_Type;
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extern const JSType Boolean_Type;
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extern const JSType Null_Type;
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extern const JSType Void_Type;
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extern const JSType None_Type;
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} /* namespace JSTypes */
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} /* namespace JavaScript */
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#endif /* jstypes_h */
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