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1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 *
3 * ***** BEGIN LICENSE BLOCK *****
4 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 *
6 * The contents of this file are subject to the Mozilla Public License Version
7 * 1.1 (the "License"); you may not use this file except in compliance with
8 * the License. You may obtain a copy of the License at
9 * http://www.mozilla.org/MPL/
10 *
11 * Software distributed under the License is distributed on an "AS IS" basis,
12 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 * for the specific language governing rights and limitations under the
14 * License.
15 *
16 * The Original Code is Mozilla Communicator client code, released
17 * March 31, 1998.
18 *
19 * The Initial Developer of the Original Code is
20 * Netscape Communications Corporation.
21 * Portions created by the Initial Developer are Copyright (C) 1998
22 * the Initial Developer. All Rights Reserved.
23 *
24 * Contributor(s):
25 *
26 * Alternatively, the contents of this file may be used under the terms of
27 * either of the GNU General Public License Version 2 or later (the "GPL"),
28 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 * in which case the provisions of the GPL or the LGPL are applicable instead
30 * of those above. If you wish to allow use of your version of this file only
31 * under the terms of either the GPL or the LGPL, and not to allow others to
32 * use your version of this file under the terms of the MPL, indicate your
33 * decision by deleting the provisions above and replace them with the notice
34 * and other provisions required by the GPL or the LGPL. If you do not delete
35 * the provisions above, a recipient may use your version of this file under
36 * the terms of any one of the MPL, the GPL or the LGPL.
37 *
38 * ***** END LICENSE BLOCK ***** */
39
40 #ifndef jspubtd_h___
41 #define jspubtd_h___
42 /*
43 * JS public API typedefs.
44 */
45 #include "jstypes.h"
46 #include "jscompat.h"
47
48 JS_BEGIN_EXTERN_C
49
50 /* Scalar typedefs. */
51 typedef uint16 jschar;
52 typedef int32 jsint;
53 typedef uint32 jsuint;
54 typedef float64 jsdouble;
55 typedef jsword jsval;
56 typedef jsword jsid;
57 typedef int32 jsrefcount; /* PRInt32 if JS_THREADSAFE, see jslock.h */
58
59 /*
60 * Run-time version enumeration. See jsversion.h for compile-time counterparts
61 * to these values that may be selected by the JS_VERSION macro, and tested by
62 * #if expressions.
63 */
64 typedef enum JSVersion {
65 JSVERSION_1_0 = 100,
66 JSVERSION_1_1 = 110,
67 JSVERSION_1_2 = 120,
68 JSVERSION_1_3 = 130,
69 JSVERSION_1_4 = 140,
70 JSVERSION_ECMA_3 = 148,
71 JSVERSION_1_5 = 150,
72 JSVERSION_1_6 = 160,
73 JSVERSION_1_7 = 170,
74 JSVERSION_1_8 = 180,
75 JSVERSION_DEFAULT = 0,
76 JSVERSION_UNKNOWN = -1,
77 JSVERSION_LATEST = JSVERSION_1_8
78 } JSVersion;
79
80 #define JSVERSION_IS_ECMA(version) \
81 ((version) == JSVERSION_DEFAULT || (version) >= JSVERSION_1_3)
82
83 /* Result of typeof operator enumeration. */
84 typedef enum JSType {
85 JSTYPE_VOID, /* undefined */
86 JSTYPE_OBJECT, /* object */
87 JSTYPE_FUNCTION, /* function */
88 JSTYPE_STRING, /* string */
89 JSTYPE_NUMBER, /* number */
90 JSTYPE_BOOLEAN, /* boolean */
91 JSTYPE_NULL, /* null */
92 JSTYPE_XML, /* xml object */
93 JSTYPE_LIMIT
94 } JSType;
95
96 /* Dense index into cached prototypes and class atoms for standard objects. */
97 typedef enum JSProtoKey {
98 #define JS_PROTO(name,code,init) JSProto_##name = code,
99 #include "jsproto.tbl"
100 #undef JS_PROTO
101 JSProto_LIMIT
102 } JSProtoKey;
103
104 /* JSObjectOps.checkAccess mode enumeration. */
105 typedef enum JSAccessMode {
106 JSACC_PROTO = 0, /* XXXbe redundant w.r.t. id */
107 JSACC_PARENT = 1, /* XXXbe redundant w.r.t. id */
108
109 /*
110 * enum value #2 formerly called JSACC_IMPORT,
111 * gap preserved for ABI compatibility.
112 */
113
114 JSACC_WATCH = 3, /* a watchpoint on object foo for id 'bar' */
115 JSACC_READ = 4, /* a "get" of foo.bar */
116 JSACC_WRITE = 8, /* a "set" of foo.bar = baz */
117 JSACC_LIMIT
118 } JSAccessMode;
119
120 #define JSACC_TYPEMASK (JSACC_WRITE - 1)
121
122 /*
123 * This enum type is used to control the behavior of a JSObject property
124 * iterator function that has type JSNewEnumerate.
125 */
126 typedef enum JSIterateOp {
127 JSENUMERATE_INIT, /* Create new iterator state */
128 JSENUMERATE_NEXT, /* Iterate once */
129 JSENUMERATE_DESTROY /* Destroy iterator state */
130 } JSIterateOp;
131
132 /* Struct typedefs. */
133 typedef struct JSClass JSClass;
134 typedef struct JSExtendedClass JSExtendedClass;
135 typedef struct JSConstDoubleSpec JSConstDoubleSpec;
136 typedef struct JSContext JSContext;
137 typedef struct JSErrorReport JSErrorReport;
138 typedef struct JSFunction JSFunction;
139 typedef struct JSFunctionSpec JSFunctionSpec;
140 typedef struct JSTracer JSTracer;
141 typedef struct JSIdArray JSIdArray;
142 typedef struct JSPropertyDescriptor JSPropertyDescriptor;
143 typedef struct JSPropertySpec JSPropertySpec;
144 typedef struct JSObject JSObject;
145 typedef struct JSObjectMap JSObjectMap;
146 typedef struct JSObjectOps JSObjectOps;
147 typedef struct JSRuntime JSRuntime;
148 typedef struct JSScript JSScript;
149 typedef struct JSStackFrame JSStackFrame;
150 typedef struct JSString JSString;
151 typedef struct JSXDRState JSXDRState;
152 typedef struct JSExceptionState JSExceptionState;
153 typedef struct JSLocaleCallbacks JSLocaleCallbacks;
154 typedef struct JSSecurityCallbacks JSSecurityCallbacks;
155 typedef struct JSONParser JSONParser;
156
157 /* JSClass (and JSObjectOps where appropriate) function pointer typedefs. */
158
159 /*
160 * Add, delete, get or set a property named by id in obj. Note the jsval id
161 * type -- id may be a string (Unicode property identifier) or an int (element
162 * index). The *vp out parameter, on success, is the new property value after
163 * an add, get, or set. After a successful delete, *vp is JSVAL_FALSE iff
164 * obj[id] can't be deleted (because it's permanent).
165 */
166 typedef JSBool
167 (* JSPropertyOp)(JSContext *cx, JSObject *obj, jsval id, jsval *vp);
168
169 /*
170 * This function type is used for callbacks that enumerate the properties of
171 * a JSObject. The behavior depends on the value of enum_op:
172 *
173 * JSENUMERATE_INIT
174 * A new, opaque iterator state should be allocated and stored in *statep.
175 * (You can use PRIVATE_TO_JSVAL() to tag the pointer to be stored).
176 *
177 * The number of properties that will be enumerated should be returned as
178 * an integer jsval in *idp, if idp is non-null, and provided the number of
179 * enumerable properties is known. If idp is non-null and the number of
180 * enumerable properties can't be computed in advance, *idp should be set
181 * to JSVAL_ZERO.
182 *
183 * JSENUMERATE_NEXT
184 * A previously allocated opaque iterator state is passed in via statep.
185 * Return the next jsid in the iteration using *idp. The opaque iterator
186 * state pointed at by statep is destroyed and *statep is set to JSVAL_NULL
187 * if there are no properties left to enumerate.
188 *
189 * JSENUMERATE_DESTROY
190 * Destroy the opaque iterator state previously allocated in *statep by a
191 * call to this function when enum_op was JSENUMERATE_INIT.
192 *
193 * The return value is used to indicate success, with a value of JS_FALSE
194 * indicating failure.
195 */
196 typedef JSBool
197 (* JSNewEnumerateOp)(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
198 jsval *statep, jsid *idp);
199
200 /*
201 * The old-style JSClass.enumerate op should define all lazy properties not
202 * yet reflected in obj.
203 */
204 typedef JSBool
205 (* JSEnumerateOp)(JSContext *cx, JSObject *obj);
206
207 /*
208 * Resolve a lazy property named by id in obj by defining it directly in obj.
209 * Lazy properties are those reflected from some peer native property space
210 * (e.g., the DOM attributes for a given node reflected as obj) on demand.
211 *
212 * JS looks for a property in an object, and if not found, tries to resolve
213 * the given id. If resolve succeeds, the engine looks again in case resolve
214 * defined obj[id]. If no such property exists directly in obj, the process
215 * is repeated with obj's prototype, etc.
216 *
217 * NB: JSNewResolveOp provides a cheaper way to resolve lazy properties.
218 */
219 typedef JSBool
220 (* JSResolveOp)(JSContext *cx, JSObject *obj, jsval id);
221
222 /*
223 * Like JSResolveOp, but flags provide contextual information as follows:
224 *
225 * JSRESOLVE_QUALIFIED a qualified property id: obj.id or obj[id], not id
226 * JSRESOLVE_ASSIGNING obj[id] is on the left-hand side of an assignment
227 * JSRESOLVE_DETECTING 'if (o.p)...' or similar detection opcode sequence
228 * JSRESOLVE_DECLARING var, const, or function prolog declaration opcode
229 * JSRESOLVE_CLASSNAME class name used when constructing
230 *
231 * The *objp out parameter, on success, should be null to indicate that id
232 * was not resolved; and non-null, referring to obj or one of its prototypes,
233 * if id was resolved.
234 *
235 * This hook instead of JSResolveOp is called via the JSClass.resolve member
236 * if JSCLASS_NEW_RESOLVE is set in JSClass.flags.
237 *
238 * Setting JSCLASS_NEW_RESOLVE and JSCLASS_NEW_RESOLVE_GETS_START further
239 * extends this hook by passing in the starting object on the prototype chain
240 * via *objp. Thus a resolve hook implementation may define the property id
241 * being resolved in the object in which the id was first sought, rather than
242 * in a prototype object whose class led to the resolve hook being called.
243 *
244 * When using JSCLASS_NEW_RESOLVE_GETS_START, the resolve hook must therefore
245 * null *objp to signify "not resolved". With only JSCLASS_NEW_RESOLVE and no
246 * JSCLASS_NEW_RESOLVE_GETS_START, the hook can assume *objp is null on entry.
247 * This is not good practice, but enough existing hook implementations count
248 * on it that we can't break compatibility by passing the starting object in
249 * *objp without a new JSClass flag.
250 */
251 typedef JSBool
252 (* JSNewResolveOp)(JSContext *cx, JSObject *obj, jsval id, uintN flags,
253 JSObject **objp);
254
255 /*
256 * Convert obj to the given type, returning true with the resulting value in
257 * *vp on success, and returning false on error or exception.
258 */
259 typedef JSBool
260 (* JSConvertOp)(JSContext *cx, JSObject *obj, JSType type, jsval *vp);
261
262 /*
263 * Finalize obj, which the garbage collector has determined to be unreachable
264 * from other live objects or from GC roots. Obviously, finalizers must never
265 * store a reference to obj.
266 */
267 typedef void
268 (* JSFinalizeOp)(JSContext *cx, JSObject *obj);
269
270 /*
271 * Used by JS_AddExternalStringFinalizer and JS_RemoveExternalStringFinalizer
272 * to extend and reduce the set of string types finalized by the GC.
273 */
274 typedef void
275 (* JSStringFinalizeOp)(JSContext *cx, JSString *str);
276
277 /*
278 * The signature for JSClass.getObjectOps, used by JS_NewObject's internals
279 * to discover the set of high-level object operations to use for new objects
280 * of the given class. All native objects have a JSClass, which is stored as
281 * a private (int-tagged) pointer in obj slots. In contrast, all native and
282 * host objects have a JSObjectMap at obj->map, which may be shared among a
283 * number of objects, and which contains the JSObjectOps *ops pointer used to
284 * dispatch object operations from API calls.
285 *
286 * Thus JSClass (which pre-dates JSObjectOps in the API) provides a low-level
287 * interface to class-specific code and data, while JSObjectOps allows for a
288 * higher level of operation, which does not use the object's class except to
289 * find the class's JSObjectOps struct, by calling clasp->getObjectOps, and to
290 * finalize the object.
291 *
292 * If this seems backwards, that's because it is! API compatibility requires
293 * a JSClass *clasp parameter to JS_NewObject, etc. Most host objects do not
294 * need to implement the larger JSObjectOps, and can share the common JSScope
295 * code and data used by the native (js_ObjectOps, see jsobj.c) ops.
296 */
297 typedef JSObjectOps *
298 (* JSGetObjectOps)(JSContext *cx, JSClass *clasp);
299
300 /*
301 * JSClass.checkAccess type: check whether obj[id] may be accessed per mode,
302 * returning false on error/exception, true on success with obj[id]'s last-got
303 * value in *vp, and its attributes in *attrsp. As for JSPropertyOp above, id
304 * is either a string or an int jsval.
305 *
306 * See JSCheckAccessIdOp, below, for the JSObjectOps counterpart, which takes
307 * a jsid (a tagged int or aligned, unique identifier pointer) rather than a
308 * jsval. The native js_ObjectOps.checkAccess simply forwards to the object's
309 * clasp->checkAccess, so that both JSClass and JSObjectOps implementors may
310 * specialize access checks.
311 */
312 typedef JSBool
313 (* JSCheckAccessOp)(JSContext *cx, JSObject *obj, jsval id, JSAccessMode mode,
314 jsval *vp);
315
316 /*
317 * Encode or decode an object, given an XDR state record representing external
318 * data. See jsxdrapi.h.
319 */
320 typedef JSBool
321 (* JSXDRObjectOp)(JSXDRState *xdr, JSObject **objp);
322
323 /*
324 * Check whether v is an instance of obj. Return false on error or exception,
325 * true on success with JS_TRUE in *bp if v is an instance of obj, JS_FALSE in
326 * *bp otherwise.
327 */
328 typedef JSBool
329 (* JSHasInstanceOp)(JSContext *cx, JSObject *obj, jsval v, JSBool *bp);
330
331 /*
332 * Deprecated function type for JSClass.mark. All new code should define
333 * JSTraceOp instead to ensure the traversal of traceable things stored in
334 * the native structures.
335 */
336 typedef uint32
337 (* JSMarkOp)(JSContext *cx, JSObject *obj, void *arg);
338
339 /*
340 * Function type for trace operation of the class called to enumerate all
341 * traceable things reachable from obj's private data structure. For each such
342 * thing, a trace implementation must call
343 *
344 * JS_CallTracer(trc, thing, kind);
345 *
346 * or one of its convenience macros as described in jsapi.h.
347 *
348 * JSTraceOp implementation can assume that no other threads mutates object
349 * state. It must not change state of the object or corresponding native
350 * structures. The only exception for this rule is the case when the embedding
351 * needs a tight integration with GC. In that case the embedding can check if
352 * the traversal is a part of the marking phase through calling
353 * JS_IsGCMarkingTracer and apply a special code like emptying caches or
354 * marking its native structures.
355 *
356 * To define the tracer for a JSClass, the implementation must add
357 * JSCLASS_MARK_IS_TRACE to class flags and use JS_CLASS_TRACE(method)
358 * macro below to convert JSTraceOp to JSMarkOp when initializing or
359 * assigning JSClass.mark field.
360 */
361 typedef void
362 (* JSTraceOp)(JSTracer *trc, JSObject *obj);
363
364 #if defined __GNUC__ && __GNUC__ >= 4 && !defined __cplusplus
365 # define JS_CLASS_TRACE(method) \
366 (__builtin_types_compatible_p(JSTraceOp, __typeof(&(method))) \
367 ? (JSMarkOp)(method) \
368 : js_WrongTypeForClassTracer)
369
370 extern JSMarkOp js_WrongTypeForClassTracer;
371
372 #else
373 # define JS_CLASS_TRACE(method) ((JSMarkOp)(method))
374 #endif
375
376 /*
377 * Tracer callback, called for each traceable thing directly refrenced by a
378 * particular object or runtime structure. It is the callback responsibility
379 * to ensure the traversal of the full object graph via calling eventually
380 * JS_TraceChildren on the passed thing. In this case the callback must be
381 * prepared to deal with cycles in the traversal graph.
382 *
383 * kind argument is one of JSTRACE_OBJECT, JSTRACE_DOUBLE, JSTRACE_STRING or
384 * a tag denoting internal implementation-specific traversal kind. In the
385 * latter case the only operations on thing that the callback can do is to call
386 * JS_TraceChildren or DEBUG-only JS_PrintTraceThingInfo.
387 */
388 typedef void
389 (* JSTraceCallback)(JSTracer *trc, void *thing, uint32 kind);
390
391 /*
392 * DEBUG only callback that JSTraceOp implementation can provide to return
393 * a string describing the reference traced with JS_CallTracer.
394 */
395 typedef void
396 (* JSTraceNamePrinter)(JSTracer *trc, char *buf, size_t bufsize);
397
398 /*
399 * The optional JSClass.reserveSlots hook allows a class to make computed
400 * per-instance object slots reservations, in addition to or instead of using
401 * JSCLASS_HAS_RESERVED_SLOTS(n) in the JSClass.flags initializer to reserve
402 * a constant-per-class number of slots. Implementations of this hook should
403 * return the number of slots to reserve, not including any reserved by using
404 * JSCLASS_HAS_RESERVED_SLOTS(n) in JSClass.flags.
405 *
406 * NB: called with obj locked by the JSObjectOps-specific mutual exclusion
407 * mechanism appropriate for obj, so don't nest other operations that might
408 * also lock obj.
409 */
410 typedef uint32
411 (* JSReserveSlotsOp)(JSContext *cx, JSObject *obj);
412
413 /* JSExtendedClass function pointer typedefs. */
414
415 typedef JSBool
416 (* JSEqualityOp)(JSContext *cx, JSObject *obj, jsval v, JSBool *bp);
417
418 /*
419 * A generic type for functions mapping an object to another object, or null
420 * if an error or exception was thrown on cx. Used by JSObjectOps.thisObject
421 * at present.
422 */
423 typedef JSObject *
424 (* JSObjectOp)(JSContext *cx, JSObject *obj);
425
426 /*
427 * Hook that creates an iterator object for a given object. Returns the
428 * iterator object or null if an error or exception was thrown on cx.
429 */
430 typedef JSObject *
431 (* JSIteratorOp)(JSContext *cx, JSObject *obj, JSBool keysonly);
432
433 /* Typedef for native functions called by the JS VM. */
434
435 typedef JSBool
436 (* JSNative)(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
437 jsval *rval);
438
439 /* See jsapi.h, the JS_CALLEE, JS_THIS, etc. macros. */
440 typedef JSBool
441 (* JSFastNative)(JSContext *cx, uintN argc, jsval *vp);
442
443 /* Callbacks and their arguments. */
444
445 typedef enum JSContextOp {
446 JSCONTEXT_NEW,
447 JSCONTEXT_DESTROY
448 } JSContextOp;
449
450 /*
451 * The possible values for contextOp when the runtime calls the callback are:
452 * JSCONTEXT_NEW JS_NewContext successfully created a new JSContext
453 * instance. The callback can initialize the instance as
454 * required. If the callback returns false, the instance
455 * will be destroyed and JS_NewContext returns null. In
456 * this case the callback is not called again.
457 * JSCONTEXT_DESTROY One of JS_DestroyContext* methods is called. The
458 * callback may perform its own cleanup and must always
459 * return true.
460 * Any other value For future compatibility the callback must do nothing
461 * and return true in this case.
462 */
463 typedef JSBool
464 (* JSContextCallback)(JSContext *cx, uintN contextOp);
465
466 #ifndef JS_THREADSAFE
467 typedef void
468 (* JSHeartbeatCallback)(JSRuntime *rt);
469 #endif
470
471 typedef enum JSGCStatus {
472 JSGC_BEGIN,
473 JSGC_END,
474 JSGC_MARK_END,
475 JSGC_FINALIZE_END
476 } JSGCStatus;
477
478 typedef JSBool
479 (* JSGCCallback)(JSContext *cx, JSGCStatus status);
480
481 /*
482 * Generic trace operation that calls JS_CallTracer on each traceable thing
483 * stored in data.
484 */
485 typedef void
486 (* JSTraceDataOp)(JSTracer *trc, void *data);
487
488 typedef JSBool
489 (* JSOperationCallback)(JSContext *cx);
490
491 /*
492 * Deprecated form of JSOperationCallback.
493 */
494 typedef JSBool
495 (* JSBranchCallback)(JSContext *cx, JSScript *script);
496
497 typedef void
498 (* JSErrorReporter)(JSContext *cx, const char *message, JSErrorReport *report);
499
500 /*
501 * Possible exception types. These types are part of a JSErrorFormatString
502 * structure. They define which error to throw in case of a runtime error.
503 * JSEXN_NONE marks an unthrowable error.
504 */
505 typedef enum JSExnType {
506 JSEXN_NONE = -1,
507 JSEXN_ERR,
508 JSEXN_INTERNALERR,
509 JSEXN_EVALERR,
510 JSEXN_RANGEERR,
511 JSEXN_REFERENCEERR,
512 JSEXN_SYNTAXERR,
513 JSEXN_TYPEERR,
514 JSEXN_URIERR,
515 JSEXN_LIMIT
516 } JSExnType;
517
518 typedef struct JSErrorFormatString {
519 /* The error format string (UTF-8 if js_CStringsAreUTF8). */
520 const char *format;
521
522 /* The number of arguments to expand in the formatted error message. */
523 uint16 argCount;
524
525 /* One of the JSExnType constants above. */
526 int16 exnType;
527 } JSErrorFormatString;
528
529 typedef const JSErrorFormatString *
530 (* JSErrorCallback)(void *userRef, const char *locale,
531 const uintN errorNumber);
532
533 #ifdef va_start
534 #define JS_ARGUMENT_FORMATTER_DEFINED 1
535
536 typedef JSBool
537 (* JSArgumentFormatter)(JSContext *cx, const char *format, JSBool fromJS,
538 jsval **vpp, va_list *app);
539 #endif
540
541 typedef JSBool
542 (* JSLocaleToUpperCase)(JSContext *cx, JSString *src, jsval *rval);
543
544 typedef JSBool
545 (* JSLocaleToLowerCase)(JSContext *cx, JSString *src, jsval *rval);
546
547 typedef JSBool
548 (* JSLocaleCompare)(JSContext *cx, JSString *src1, JSString *src2,
549 jsval *rval);
550
551 typedef JSBool
552 (* JSLocaleToUnicode)(JSContext *cx, char *src, jsval *rval);
553
554 /*
555 * Security protocol types.
556 */
557 typedef struct JSPrincipals JSPrincipals;
558
559 /*
560 * XDR-encode or -decode a principals instance, based on whether xdr->mode is
561 * JSXDR_ENCODE, in which case *principalsp should be encoded; or JSXDR_DECODE,
562 * in which case implementations must return a held (via JSPRINCIPALS_HOLD),
563 * non-null *principalsp out parameter. Return true on success, false on any
564 * error, which the implementation must have reported.
565 */
566 typedef JSBool
567 (* JSPrincipalsTranscoder)(JSXDRState *xdr, JSPrincipals **principalsp);
568
569 /*
570 * Return a weak reference to the principals associated with obj, possibly via
571 * the immutable parent chain leading from obj to a top-level container (e.g.,
572 * a window object in the DOM level 0). If there are no principals associated
573 * with obj, return null. Therefore null does not mean an error was reported;
574 * in no event should an error be reported or an exception be thrown by this
575 * callback's implementation.
576 */
577 typedef JSPrincipals *
578 (* JSObjectPrincipalsFinder)(JSContext *cx, JSObject *obj);
579
580 JS_END_EXTERN_C
581
582 #endif /* jspubtd_h___ */

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