forked from MacRuby/MacRuby
-
Notifications
You must be signed in to change notification settings - Fork 1
/
enumerator.c
526 lines (455 loc) · 11.7 KB
/
enumerator.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
/************************************************
enumerator.c - provides Enumerator class
$Author: knu $
Copyright (C) 2001-2003 Akinori MUSHA
$Idaemons: /home/cvs/rb/enumerator/enumerator.c,v 1.1.1.1 2001/07/15 10:12:48 knu Exp $
$RoughId: enumerator.c,v 1.6 2003/07/27 11:03:24 nobu Exp $
$Id: enumerator.c 16614 2008-05-26 08:49:08Z knu $
************************************************/
#include "ruby/macruby.h"
#include "id.h"
/*
* Document-class: Enumerable::Enumerator
*
* A class which provides a method `each' to be used as an Enumerable
* object.
*/
VALUE rb_cEnumerator;
static VALUE sym_each;
VALUE rb_eStopIteration;
struct enumerator {
VALUE obj;
SEL sel;
VALUE args;
VALUE fib;
VALUE dst;
VALUE no_next;
};
static struct enumerator *
enumerator_ptr(VALUE obj)
{
struct enumerator *ptr;
Data_Get_Struct(obj, struct enumerator, ptr);
#if 0
if (RDATA(obj)->dmark != enumerator_mark) {
rb_raise(rb_eTypeError,
"wrong argument type %s (expected %s)",
rb_obj_classname(obj), rb_class2name(rb_cEnumerator));
}
#endif
if (!ptr) {
rb_raise(rb_eArgError, "uninitialized enumerator");
}
return ptr;
}
/*
* call-seq:
* obj.to_enum(method = :each, *args)
* obj.enum_for(method = :each, *args)
*
* Returns Enumerable::Enumerator.new(self, method, *args).
*
* e.g.:
*
* str = "xyz"
*
* enum = str.enum_for(:each_byte)
* a = enum.map {|b| '%02x' % b } #=> ["78", "79", "7a"]
*
* # protects an array from being modified
* a = [1, 2, 3]
* some_method(a.to_enum)
*
*/
static VALUE
obj_to_enum(VALUE obj, SEL sel, int argc, VALUE *argv)
{
VALUE meth = sym_each;
if (argc > 0) {
--argc;
meth = *argv++;
}
ID meth_id = rb_to_id(meth);
SEL enum_sel;
if (argc > 0) {
char buf[100];
snprintf(buf, sizeof buf, "%s:", rb_id2name(meth_id));
enum_sel = sel_registerName(buf);
}
else {
enum_sel = sel_registerName(rb_id2name(meth_id));
}
return rb_enumeratorize(obj, enum_sel, argc, argv);
}
static VALUE
each_slice_i(VALUE val, VALUE *memo)
{
VALUE ary = memo[0];
VALUE v = Qnil;
long size = (long)memo[1];
rb_ary_push(ary, val);
if (RARRAY_LEN(ary) == size) {
v = rb_yield(ary);
memo[0] = rb_ary_new2(size);
}
return v;
}
/*
* call-seq:
* e.each_slice(n) {...}
* e.each_slice(n)
*
* Iterates the given block for each slice of <n> elements. If no
* block is given, returns an enumerator.
*
* e.g.:
* (1..10).each_slice(3) {|a| p a}
* # outputs below
* [1, 2, 3]
* [4, 5, 6]
* [7, 8, 9]
* [10]
*
*/
static VALUE
enum_each_slice(VALUE obj, SEL sel, VALUE n)
{
long size = NUM2LONG(n);
VALUE args[2], ary;
if (size <= 0) rb_raise(rb_eArgError, "invalid slice size");
RETURN_ENUMERATOR(obj, 1, &n);
args[0] = rb_ary_new2(size);
args[1] = (VALUE)size;
rb_objc_block_call(obj, selEach, 0, 0, each_slice_i, (VALUE)args);
ary = args[0];
if (RARRAY_LEN(ary) > 0) rb_yield(ary);
return Qnil;
}
static VALUE
each_cons_i(VALUE val, VALUE *memo)
{
VALUE ary = memo[0];
VALUE v = Qnil;
long size = (long)memo[1];
if (RARRAY_LEN(ary) == size) {
rb_ary_shift(ary);
}
rb_ary_push(ary, val);
if (RARRAY_LEN(ary) == size) {
v = rb_yield(rb_ary_dup(ary));
}
return v;
}
/*
* call-seq:
* each_cons(n) {...}
* each_cons(n)
*
* Iterates the given block for each array of consecutive <n>
* elements. If no block is given, returns an enumerator.a
*
* e.g.:
* (1..10).each_cons(3) {|a| p a}
* # outputs below
* [1, 2, 3]
* [2, 3, 4]
* [3, 4, 5]
* [4, 5, 6]
* [5, 6, 7]
* [6, 7, 8]
* [7, 8, 9]
* [8, 9, 10]
*
*/
static VALUE
enum_each_cons(VALUE obj, SEL sel, VALUE n)
{
long size = NUM2LONG(n);
VALUE args[2];
if (size <= 0) rb_raise(rb_eArgError, "invalid size");
RETURN_ENUMERATOR(obj, 1, &n);
args[0] = rb_ary_new2(size);
args[1] = (VALUE)size;
rb_objc_block_call(obj, selEach, 0, 0, each_cons_i, (VALUE)args);
return Qnil;
}
static VALUE
enumerator_allocate(VALUE klass)
{
struct enumerator *ptr;
return Data_Make_Struct(klass, struct enumerator,
NULL, -1, ptr);
}
static VALUE
enumerator_each_i(VALUE v, VALUE enum_obj, int argc, VALUE *argv)
{
return rb_yield_values2(argc, argv);
}
static VALUE
enumerator_init(VALUE enum_obj, VALUE obj, SEL sel, int argc, VALUE *argv)
{
struct enumerator *ptr = enumerator_ptr(enum_obj);
GC_WB(&ptr->obj, obj);
ptr->sel = sel;
if (argc > 0) {
GC_WB(&ptr->args, rb_ary_new4(argc, argv));
}
ptr->fib = 0;
ptr->dst = Qnil;
ptr->no_next = Qfalse;
return enum_obj;
}
/*
* call-seq:
* Enumerable::Enumerator.new(obj, method = :each, *args)
*
* Creates a new Enumerable::Enumerator object, which is to be
* used as an Enumerable object using the given object's given
* method with the given arguments.
*
* Use of this method is not discouraged. Use Kernel#enum_for()
* instead.
*/
static VALUE
enumerator_initialize(VALUE obj, SEL sel, int argc, VALUE *argv)
{
VALUE recv, meth = sym_each;
if (argc == 0)
rb_raise(rb_eArgError, "wrong number of argument (0 for 1)");
recv = *argv++;
if (--argc) {
meth = *argv++;
--argc;
}
ID meth_id = rb_to_id(meth);
SEL meth_sel;
if (argc == 0) {
meth_sel = sel_registerName(rb_id2name(meth_id));
}
else {
char buf[100];
snprintf(buf, sizeof buf, "%s:", rb_id2name(meth_id));
meth_sel = sel_registerName(buf);
}
return enumerator_init(obj, recv, meth_sel, argc, argv);
}
/* :nodoc: */
static VALUE
enumerator_init_copy(VALUE obj, SEL sel, VALUE orig)
{
struct enumerator *ptr0, *ptr1;
ptr0 = enumerator_ptr(orig);
if (ptr0->fib) {
/* Fibers cannot be copied */
rb_raise(rb_eTypeError, "can't copy execution context");
}
ptr1 = enumerator_ptr(obj);
GC_WB(&ptr1->obj, ptr0->obj);
ptr1->sel = ptr0->sel;
if (ptr0->args != 0) {
GC_WB(&ptr1->args, ptr0->args);
}
ptr1->fib = 0;
return obj;
}
VALUE
rb_enumeratorize(VALUE obj, SEL sel, int argc, VALUE *argv)
{
return enumerator_init(enumerator_allocate(rb_cEnumerator), obj, sel,
argc, argv);
}
static VALUE
enumerator_block_call(VALUE obj, VALUE (*func)(ANYARGS), VALUE arg)
{
struct enumerator *e;
int argc = 0;
const VALUE *argv = 0;
e = enumerator_ptr(obj);
if (e->args != 0) {
argc = RARRAY_LEN(e->args);
argv = RARRAY_PTR(e->args);
}
return rb_objc_block_call(e->obj, e->sel, argc, (VALUE *)argv,
func, arg);
}
/*
* call-seq:
* enum.each {...}
*
* Iterates the given block using the object and the method specified
* in the first place. If no block is given, returns self.
*
*/
static VALUE
enumerator_each(VALUE obj, SEL sel)
{
if (!rb_block_given_p()) {
return obj;
}
return enumerator_block_call(obj, enumerator_each_i, obj);
}
static VALUE
enumerator_with_index_i(VALUE val, VALUE m, int argc, VALUE *argv)
{
VALUE idx;
VALUE *memo = (VALUE *)m;
idx = INT2FIX(*memo);
++*memo;
if (argc <= 1)
return rb_yield_values(2, val, idx);
return rb_yield_values(2, rb_ary_new4(argc, argv), idx);
}
/*
* call-seq:
* e.with_index(offset = 0) {|(*args), idx| ... }
* e.with_index
*
* Iterates the given block for each elements with an index, which
* starts from +offset+. If no block is given, returns an enumerator.
*
*/
static VALUE
enumerator_with_index(VALUE obj, SEL sel, int argc, VALUE *argv)
{
VALUE memo;
rb_scan_args(argc, argv, "01", &memo);
RETURN_ENUMERATOR(obj, argc, argv);
memo = NIL_P(memo) ? 0 : (VALUE)NUM2LONG(memo);
return enumerator_block_call(obj, enumerator_with_index_i, (VALUE)&memo);
}
/*
* call-seq:
* e.each_with_index {|(*args), idx| ... }
* e.each_with_index
*
* Same as Enumeartor#with_index, except each_with_index does not
* receive an offset argument.
*
*/
static VALUE
enumerator_each_with_index(VALUE obj, SEL sel)
{
return enumerator_with_index(obj, sel, 0, NULL);
}
static VALUE
enumerator_with_object_i(VALUE val, VALUE memo, int argc, VALUE *argv)
{
if (argc <= 1) {
return rb_yield_values(2, val, memo);
}
return rb_yield_values(2, rb_ary_new4(argc, argv), memo);
}
/*
* call-seq:
* e.with_object(obj) {|(*args), memo_obj| ... }
* e.with_object(obj)
*
* Iterates the given block for each element with an arbitrary
* object given, and returns the initially given object.
*
* If no block is given, returns an enumerator.
*
*/
static VALUE
enumerator_with_object(VALUE obj, SEL sel, VALUE memo)
{
RETURN_ENUMERATOR(obj, 1, &memo);
enumerator_block_call(obj, enumerator_with_object_i, memo);
return memo;
}
#if 0
static VALUE
next_ii(VALUE i, VALUE obj, int argc, VALUE *argv)
{
rb_fiber_yield(argc, argv);
return Qnil;
}
static VALUE
next_i(VALUE curr, VALUE obj)
{
struct enumerator *e = enumerator_ptr(obj);
VALUE rnil = Qnil;
rb_block_call(obj, rb_intern("each"), 0, 0, next_ii, obj);
e->no_next = Qtrue;
return rb_fiber_yield(1, &rnil);
}
static void
next_init(VALUE obj, struct enumerator *e)
{
VALUE curr = rb_fiber_current();
e->dst = curr;
e->fib = rb_fiber_new(next_i, obj);
}
#endif
/*
* call-seq:
* e.next => object
*
* Returns the next object in the enumerator, and move the internal
* position forward. When the position reached at the end, internal
* position is rewinded then StopIteration is raised.
*
* Note that enumeration sequence by next method does not affect other
* non-external enumeration methods, unless underlying iteration
* methods itself has side-effect, e.g. IO#each_line.
*
*/
static VALUE
enumerator_next(VALUE obj, SEL sel)
{
// TODO
#if 0
struct enumerator *e = enumerator_ptr(obj);
VALUE curr, v;
curr = rb_fiber_current();
if (!e->fib || !rb_fiber_alive_p(e->fib)) {
next_init(obj, e);
}
v = rb_fiber_resume(e->fib, 1, &curr);
if (e->no_next) {
e->fib = 0;
e->dst = Qnil;
e->no_next = Qfalse;
rb_raise(rb_eStopIteration, "iteration reached at end");
}
return v;
#endif
return Qnil;
}
/*
* call-seq:
* e.rewind => e
*
* Rewinds the enumeration sequence by the next method.
*/
static VALUE
enumerator_rewind(VALUE obj, SEL sel)
{
struct enumerator *e = enumerator_ptr(obj);
e->fib = 0;
e->dst = Qnil;
e->no_next = Qfalse;
return obj;
}
void
Init_Enumerator(void)
{
rb_objc_define_method(rb_mKernel, "to_enum", obj_to_enum, -1);
rb_objc_define_method(rb_mKernel, "enum_for", obj_to_enum, -1);
rb_objc_define_method(rb_mEnumerable, "each_slice", enum_each_slice, 1);
rb_objc_define_method(rb_mEnumerable, "each_cons", enum_each_cons, 1);
rb_cEnumerator = rb_define_class("Enumerator", rb_cObject);
rb_include_module(rb_cEnumerator, rb_mEnumerable);
rb_objc_define_method(*(VALUE *)rb_cEnumerator, "alloc", enumerator_allocate, 0);
rb_objc_define_method(rb_cEnumerator, "initialize", enumerator_initialize, -1);
rb_objc_define_method(rb_cEnumerator, "initialize_copy", enumerator_init_copy, 1);
rb_objc_define_method(rb_cEnumerator, "each", enumerator_each, 0);
rb_objc_define_method(rb_cEnumerator, "each_with_index", enumerator_each_with_index, 0);
rb_objc_define_method(rb_cEnumerator, "each_with_object", enumerator_with_object, 1);
rb_objc_define_method(rb_cEnumerator, "with_index", enumerator_with_index, -1);
rb_objc_define_method(rb_cEnumerator, "with_object", enumerator_with_object, 1);
rb_objc_define_method(rb_cEnumerator, "next", enumerator_next, 0);
rb_objc_define_method(rb_cEnumerator, "rewind", enumerator_rewind, 0);
rb_eStopIteration = rb_define_class("StopIteration", rb_eIndexError);
sym_each = ID2SYM(rb_intern("each"));
}