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141 lines
4.6 KiB
C
141 lines
4.6 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sw=4 et tw=78:
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1 *
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All 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 terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef jsiter_h___
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#define jsiter_h___
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/*
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* JavaScript iterators.
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*/
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#include "jsprvtd.h"
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#include "jspubtd.h"
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JS_BEGIN_EXTERN_C
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/*
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* NB: these flag bits are encoded into the bytecode stream in the immediate
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* operand of JSOP_ITER, so don't change them without advancing jsxdrapi.h's
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* JSXDR_BYTECODE_VERSION.
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*/
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#define JSITER_ENUMERATE 0x1 /* for-in compatible hidden default iterator */
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#define JSITER_FOREACH 0x2 /* return [key, value] pair rather than key */
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#define JSITER_KEYVALUE 0x4 /* destructuring for-in wants [key, value] */
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/*
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* Native iterator object slots, shared between jsiter.cpp and jstracer.cpp.
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*/
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#define JSSLOT_ITER_STATE (JSSLOT_PRIVATE)
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#define JSSLOT_ITER_FLAGS (JSSLOT_PRIVATE + 1)
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/*
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* Convert the value stored in *vp to its iteration object. The flags should
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* contain JSITER_ENUMERATE if js_ValueToIterator is called when enumerating
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* for-in semantics are required, and when the caller can guarantee that the
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* iterator will never be exposed to scripts.
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*/
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extern JS_FRIEND_API(JSBool)
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js_ValueToIterator(JSContext *cx, uintN flags, jsval *vp);
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extern JS_FRIEND_API(JSBool) JS_FASTCALL
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js_CloseIterator(JSContext *cx, jsval v);
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/*
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* Given iterobj, call iterobj.next(). If the iterator stopped, set *rval to
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* JSVAL_HOLE. Otherwise set it to the result of the next call.
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*/
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extern JS_FRIEND_API(JSBool)
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js_CallIteratorNext(JSContext *cx, JSObject *iterobj, jsval *rval);
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/*
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* Close iterobj, whose class must be js_IteratorClass.
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*/
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extern void
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js_CloseNativeIterator(JSContext *cx, JSObject *iterobj);
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extern JSBool
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js_ThrowStopIteration(JSContext *cx);
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#if JS_HAS_GENERATORS
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/*
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* Generator state codes.
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*/
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typedef enum JSGeneratorState {
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JSGEN_NEWBORN, /* not yet started */
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JSGEN_OPEN, /* started by a .next() or .send(undefined) call */
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JSGEN_RUNNING, /* currently executing via .next(), etc., call */
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JSGEN_CLOSING, /* close method is doing asynchronous return */
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JSGEN_CLOSED /* closed, cannot be started or closed again */
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} JSGeneratorState;
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struct JSGenerator {
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JSObject *obj;
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JSGeneratorState state;
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JSStackFrame frame;
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JSFrameRegs savedRegs;
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JSArena arena;
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jsval slots[1];
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};
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#define FRAME_TO_GENERATOR(fp) \
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((JSGenerator *) ((uint8 *)(fp) - offsetof(JSGenerator, frame)))
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extern JSObject *
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js_NewGenerator(JSContext *cx, JSStackFrame *fp);
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#endif
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extern JSClass js_GeneratorClass;
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extern JSClass js_IteratorClass;
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extern JSClass js_StopIterationClass;
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static inline bool
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js_ValueIsStopIteration(jsval v)
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{
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return !JSVAL_IS_PRIMITIVE(v) &&
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STOBJ_GET_CLASS(JSVAL_TO_OBJECT(v)) == &js_StopIterationClass;
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}
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extern JSObject *
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js_InitIteratorClasses(JSContext *cx, JSObject *obj);
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JS_END_EXTERN_C
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#endif /* jsiter_h___ */
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