Class: Psych::Emitter

Inherits:
Handler show all
Defined in:
ext/psych/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, #event_location, #streaming?

Constructor Details

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

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


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# File 'ext/psych/psych_emitter.c', line 74

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);
    }

    rb_ivar_set(self, id_io, io);
    yaml_emitter_set_output(emitter, writer, (void *)self);

    return self;
}

Instance Method Details

#alias(anchor) ⇒ Object

Emit an alias with anchor.

See Psych::Handler#alias


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# File 'ext/psych/psych_emitter.c', line 422

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);

    if(!NIL_P(anchor)) {
	Check_Type(anchor, T_STRING);
	anchor = rb_str_export_to_enc(anchor, rb_utf8_encoding());
    }

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

    emit(emitter, &event);

    return self;
}

#canonicalObject

Get the output style, canonical or not.


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# File 'ext/psych/psych_emitter.c', line 461

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.


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# File 'ext/psych/psych_emitter.c', line 447

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


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# File 'ext/psych/psych_emitter.c', line 223

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


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# File 'ext/psych/psych_emitter.c', line 403

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


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# File 'ext/psych/psych_emitter.c', line 339

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


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# File 'ext/psych/psych_emitter.c', line 126

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.


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# File 'ext/psych/psych_emitter.c', line 488

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.


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# File 'ext/psych/psych_emitter.c', line 474

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.


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# File 'ext/psych/psych_emitter.c', line 500

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.


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# File 'ext/psych/psych_emitter.c', line 512

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


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# File 'ext/psych/psych_emitter.c', line 243

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;
    rb_encoding *encoding;
    TypedData_Get_Struct(self, yaml_emitter_t, &psych_emitter_type, emitter);

    Check_Type(value, T_STRING);

    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);
    }

    yaml_scalar_event_initialize(
	    &event,
	    (yaml_char_t *)(NIL_P(anchor) ? NULL : StringValueCStr(anchor)),
	    (yaml_char_t *)(NIL_P(tag) ? NULL : StringValueCStr(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


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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;
}

#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


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# File 'ext/psych/psych_emitter.c', line 359

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

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

    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);
    }

    yaml_mapping_start_event_initialize(
	    &event,
	    (yaml_char_t *)(NIL_P(anchor) ? NULL : StringValueCStr(anchor)),
	    (yaml_char_t *)(NIL_P(tag) ? NULL : StringValueCStr(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


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# File 'ext/psych/psych_emitter.c', line 296

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

    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);
    }

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

    yaml_sequence_start_event_initialize(
	    &event,
	    (yaml_char_t *)(NIL_P(anchor) ? NULL : StringValueCStr(anchor)),
	    (yaml_char_t *)(NIL_P(tag) ? NULL : StringValueCStr(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


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# File 'ext/psych/psych_emitter.c', line 106

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;
}