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



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# File 'ext/psych/psych_emitter.c', line 146

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;
	rb_encoding * encoding = rb_utf8_encoding();

	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);
	    name = rb_str_export_to_enc(name, encoding);
	    value = rb_str_export_to_enc(value, encoding);

	    tail->handle = (yaml_char_t *)StringValueCStr(name);
	    tail->prefix = (yaml_char_t *)StringValueCStr(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;
}