Class: Psych::Emitter

Inherits:
Handler show all
Defined in:
psych_emitter.c

Direct Known Subclasses

Stream::Emitter

Constant Summary

Constants inherited from Handler

Handler::EVENTS, Handler::OPTIONS

Instance Method Summary collapse

Methods inherited from Handler

#empty, #streaming?

Constructor Details

#Psych::Emitter.new(io, options = Psych::Emitter::OPTIONS) ⇒ Object

Create a new Psych::Emitter that writes to io.



77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
# File 'psych_emitter.c', line 77

static VALUE initialize(int argc, VALUE *argv, VALUE self)
{
    yaml_emitter_t * emitter;
    VALUE io, options;
    VALUE line_width;
    VALUE indent;
    VALUE canonical;

    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    if (rb_scan_args(argc, argv, "11", &io, &options) == 2) {
	line_width = rb_funcall(options, id_line_width, 0);
	indent     = rb_funcall(options, id_indentation, 0);
	canonical  = rb_funcall(options, id_canonical, 0);

	yaml_emitter_set_width(emitter, NUM2INT(line_width));
	yaml_emitter_set_indent(emitter, NUM2INT(indent));
	yaml_emitter_set_canonical(emitter, Qtrue == canonical ? 1 : 0);
    }

    yaml_emitter_set_output(emitter, writer, (void *)io);

    return self;
}

Instance Method Details

#alias(anchor) ⇒ Object

Emit an alias with anchor.

See Psych::Handler#alias



437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
# File 'psych_emitter.c', line 437

static VALUE alias(VALUE self, VALUE anchor)
{
    yaml_emitter_t * emitter;
    yaml_event_t event;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

#ifdef HAVE_RUBY_ENCODING_H
    if(!NIL_P(anchor)) {
	Check_Type(anchor, T_STRING);
	anchor = rb_str_export_to_enc(anchor, rb_utf8_encoding());
    }
#endif

    yaml_alias_event_initialize(
	    &event,
	    (yaml_char_t *)(NIL_P(anchor) ? NULL : StringValuePtr(anchor))
	    );

    emit(emitter, &event);

    return self;
}

#canonicalObject

Get the output style, canonical or not.



478
479
480
481
482
483
484
# File 'psych_emitter.c', line 478

static VALUE canonical(VALUE self)
{
    yaml_emitter_t * emitter;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    return (emitter->canonical == 0) ? Qfalse : Qtrue;
}

#canonical=(true) ⇒ Object

Set the output style to canonical, or not.



464
465
466
467
468
469
470
471
472
# File 'psych_emitter.c', line 464

static VALUE set_canonical(VALUE self, VALUE style)
{
    yaml_emitter_t * emitter;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    yaml_emitter_set_canonical(emitter, Qtrue == style ? 1 : 0);

    return style;
}

#end_document(implicit) ⇒ Object

End a document emission with an implicit ending.

See Psych::Handler#end_document



229
230
231
232
233
234
235
236
237
238
239
240
# File 'psych_emitter.c', line 229

static VALUE end_document(VALUE self, VALUE imp)
{
    yaml_emitter_t * emitter;
    yaml_event_t event;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    yaml_document_end_event_initialize(&event, imp ? 1 : 0);

    emit(emitter, &event);

    return self;
}

#end_mappingObject

Emit the end of a mapping.

See Psych::Handler#end_mapping



418
419
420
421
422
423
424
425
426
427
428
429
# File 'psych_emitter.c', line 418

static VALUE end_mapping(VALUE self)
{
    yaml_emitter_t * emitter;
    yaml_event_t event;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    yaml_mapping_end_event_initialize(&event);

    emit(emitter, &event);

    return self;
}

#end_sequenceObject

End sequence emission.

See Psych::Handler#end_sequence



351
352
353
354
355
356
357
358
359
360
361
362
# File 'psych_emitter.c', line 351

static VALUE end_sequence(VALUE self)
{
    yaml_emitter_t * emitter;
    yaml_event_t event;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    yaml_sequence_end_event_initialize(&event);

    emit(emitter, &event);

    return self;
}

#end_streamObject

End a stream emission

See Psych::Handler#end_stream



128
129
130
131
132
133
134
135
136
137
138
139
# File 'psych_emitter.c', line 128

static VALUE end_stream(VALUE self)
{
    yaml_emitter_t * emitter;
    yaml_event_t event;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    yaml_stream_end_event_initialize(&event);

    emit(emitter, &event);

    return self;
}

#indentationObject

Get the indentation level.



505
506
507
508
509
510
511
# File 'psych_emitter.c', line 505

static VALUE indentation(VALUE self)
{
    yaml_emitter_t * emitter;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    return INT2NUM(emitter->best_indent);
}

#indentation=(level) ⇒ Object

Set the indentation level to level. The level must be less than 10 and greater than 1.



491
492
493
494
495
496
497
498
499
# File 'psych_emitter.c', line 491

static VALUE set_indentation(VALUE self, VALUE level)
{
    yaml_emitter_t * emitter;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    yaml_emitter_set_indent(emitter, NUM2INT(level));

    return level;
}

#line_widthObject

Get the preferred line width.



517
518
519
520
521
522
523
# File 'psych_emitter.c', line 517

static VALUE line_width(VALUE self)
{
    yaml_emitter_t * emitter;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    return INT2NUM(emitter->best_width);
}

#line_width=(width) ⇒ Object

Set the preferred line with to width.



529
530
531
532
533
534
535
536
537
# File 'psych_emitter.c', line 529

static VALUE set_line_width(VALUE self, VALUE width)
{
    yaml_emitter_t * emitter;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    yaml_emitter_set_width(emitter, NUM2INT(width));

    return width;
}

#scalar(value, anchor, tag, plain, quoted, style) ⇒ Object

Emit a scalar with value, anchor, tag, and a plain or quoted string type with style.

See Psych::Handler#scalar



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
# File 'psych_emitter.c', line 249

static VALUE scalar(
	VALUE self,
	VALUE value,
	VALUE anchor,
	VALUE tag,
	VALUE plain,
	VALUE quoted,
	VALUE style
	) {
    yaml_emitter_t * emitter;
    yaml_event_t event;
#ifdef HAVE_RUBY_ENCODING_H
    rb_encoding *encoding;
#endif
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    Check_Type(value, T_STRING);

#ifdef HAVE_RUBY_ENCODING_H
    encoding = rb_utf8_encoding();

    value = rb_str_export_to_enc(value, encoding);

    if(!NIL_P(anchor)) {
	Check_Type(anchor, T_STRING);
	anchor = rb_str_export_to_enc(anchor, encoding);
    }

    if(!NIL_P(tag)) {
	Check_Type(tag, T_STRING);
	tag = rb_str_export_to_enc(tag, encoding);
    }
#endif

    yaml_scalar_event_initialize(
	    &event,
	    (yaml_char_t *)(NIL_P(anchor) ? NULL : StringValuePtr(anchor)),
	    (yaml_char_t *)(NIL_P(tag) ? NULL : StringValuePtr(tag)),
	    (yaml_char_t*)StringValuePtr(value),
	    (int)RSTRING_LEN(value),
	    plain ? 1 : 0,
	    quoted ? 1 : 0,
	    (yaml_scalar_style_t)NUM2INT(style)
	    );

    emit(emitter, &event);

    return self;
}

#start_document(version, tags, implicit) ⇒ Object

Start a document emission with YAML version, tags, and an implicit start.

See Psych::Handler#start_document



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
# File 'psych_emitter.c', line 148

static VALUE start_document(VALUE self, VALUE version, VALUE tags, VALUE imp)
{
    yaml_emitter_t * emitter;
    yaml_tag_directive_t * head = NULL;
    yaml_tag_directive_t * tail = NULL;
    yaml_event_t event;
    yaml_version_directive_t version_directive;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);


    Check_Type(version, T_ARRAY);

    if(RARRAY_LEN(version) > 0) {
	VALUE major = rb_ary_entry(version, (long)0);
	VALUE minor = rb_ary_entry(version, (long)1);

	version_directive.major = NUM2INT(major);
	version_directive.minor = NUM2INT(minor);
    }

    if(RTEST(tags)) {
	long i = 0;
	long len;
#ifdef HAVE_RUBY_ENCODING_H
	rb_encoding * encoding = rb_utf8_encoding();
#endif

	Check_Type(tags, T_ARRAY);

	len = RARRAY_LEN(tags);
	head  = xcalloc((size_t)len, sizeof(yaml_tag_directive_t));
	tail  = head;

	for(i = 0; i < len && i < RARRAY_LEN(tags); i++) {
	    VALUE tuple = RARRAY_AREF(tags, i);
	    VALUE name;
	    VALUE value;

	    Check_Type(tuple, T_ARRAY);

	    if(RARRAY_LEN(tuple) < 2) {
		xfree(head);
		rb_raise(rb_eRuntimeError, "tag tuple must be of length 2");
	    }
	    name  = RARRAY_AREF(tuple, 0);
	    value = RARRAY_AREF(tuple, 1);
	    StringValue(name);
	    StringValue(value);
#ifdef HAVE_RUBY_ENCODING_H
	    name = rb_str_export_to_enc(name, encoding);
	    value = rb_str_export_to_enc(value, encoding);
#endif

	    tail->handle = (yaml_char_t *)RSTRING_PTR(name);
	    tail->prefix = (yaml_char_t *)RSTRING_PTR(value);

	    tail++;
	}
    }

    yaml_document_start_event_initialize(
	    &event,
	    (RARRAY_LEN(version) > 0) ? &version_directive : NULL,
	    head,
	    tail,
	    imp ? 1 : 0
	    );

    emit(emitter, &event);

    if(head) xfree(head);

    return self;
}

#start_mapping(anchor, tag, implicit, style) ⇒ Object

Start emitting a YAML map with anchor, tag, an implicit start and end, and style.

See Psych::Handler#start_mapping



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
# File 'psych_emitter.c', line 371

static VALUE start_mapping(
	VALUE self,
	VALUE anchor,
	VALUE tag,
	VALUE implicit,
	VALUE style
	) {
    yaml_emitter_t * emitter;
    yaml_event_t event;
#ifdef HAVE_RUBY_ENCODING_H
    rb_encoding *encoding;
#endif
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

#ifdef HAVE_RUBY_ENCODING_H
    encoding = rb_utf8_encoding();

    if(!NIL_P(anchor)) {
	Check_Type(anchor, T_STRING);
	anchor = rb_str_export_to_enc(anchor, encoding);
    }

    if(!NIL_P(tag)) {
	Check_Type(tag, T_STRING);
	tag = rb_str_export_to_enc(tag, encoding);
    }
#endif

    yaml_mapping_start_event_initialize(
	    &event,
	    (yaml_char_t *)(NIL_P(anchor) ? NULL : StringValuePtr(anchor)),
	    (yaml_char_t *)(NIL_P(tag) ? NULL : StringValuePtr(tag)),
	    implicit ? 1 : 0,
	    (yaml_mapping_style_t)NUM2INT(style)
	    );

    emit(emitter, &event);

    return self;
}

#start_sequence(anchor, tag, implicit, style) ⇒ Object

Start emitting a sequence with anchor, a tag, implicit sequence start and end, along with style.

See Psych::Handler#start_sequence



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
# File 'psych_emitter.c', line 306

static VALUE start_sequence(
	VALUE self,
	VALUE anchor,
	VALUE tag,
	VALUE implicit,
	VALUE style
	) {
    yaml_emitter_t * emitter;
    yaml_event_t event;

#ifdef HAVE_RUBY_ENCODING_H
    rb_encoding * encoding = rb_utf8_encoding();

    if(!NIL_P(anchor)) {
	Check_Type(anchor, T_STRING);
	anchor = rb_str_export_to_enc(anchor, encoding);
    }

    if(!NIL_P(tag)) {
	Check_Type(tag, T_STRING);
	tag = rb_str_export_to_enc(tag, encoding);
    }
#endif

    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    yaml_sequence_start_event_initialize(
	    &event,
	    (yaml_char_t *)(NIL_P(anchor) ? NULL : StringValuePtr(anchor)),
	    (yaml_char_t *)(NIL_P(tag) ? NULL : StringValuePtr(tag)),
	    implicit ? 1 : 0,
	    (yaml_sequence_style_t)NUM2INT(style)
	    );

    emit(emitter, &event);

    return self;
}

#start_stream(encoding) ⇒ Object

Start a stream emission with encoding

See Psych::Handler#start_stream



108
109
110
111
112
113
114
115
116
117
118
119
120
# File 'psych_emitter.c', line 108

static VALUE start_stream(VALUE self, VALUE encoding)
{
    yaml_emitter_t * emitter;
    yaml_event_t event;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);
    Check_Type(encoding, T_FIXNUM);

    yaml_stream_start_event_initialize(&event, (yaml_encoding_t)NUM2INT(encoding));

    emit(emitter, &event);

    return self;
}