Method: Psych::Emitter#start_document

Defined in:
ext/psych/psych_emitter.c

#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 'ext/psych/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;
}