emitter.c
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#include <psych.h>
VALUE cPsychEmitter;
static ID id_write;
static void emit(yaml_emitter_t * emitter, yaml_event_t * event)
{
if(!yaml_emitter_emit(emitter, event))
rb_raise(rb_eRuntimeError, "%s", emitter->problem);
}
static int writer(void *ctx, unsigned char *buffer, size_t size)
{
VALUE io = (VALUE)ctx;
VALUE str = rb_str_new((const char *)buffer, (long)size);
VALUE wrote = rb_funcall(io, id_write, 1, str);
return (int)NUM2INT(wrote);
}
static void dealloc(void * ptr)
{
yaml_emitter_t * emitter;
emitter = (yaml_emitter_t *)ptr;
yaml_emitter_delete(emitter);
xfree(emitter);
}
static VALUE allocate(VALUE klass)
{
yaml_emitter_t * emitter;
emitter = xmalloc(sizeof(yaml_emitter_t));
yaml_emitter_initialize(emitter);
yaml_emitter_set_unicode(emitter, 1);
yaml_emitter_set_indent(emitter, 2);
return Data_Wrap_Struct(klass, 0, dealloc, emitter);
}
/* call-seq: Psych::Emitter.new(io)
*
* Create a new Psych::Emitter that writes to +io+.
*/
static VALUE initialize(VALUE self, VALUE io)
{
yaml_emitter_t * emitter;
Data_Get_Struct(self, yaml_emitter_t, emitter);
yaml_emitter_set_output(emitter, writer, (void *)io);
return self;
}
/* call-seq: emitter.start_stream(encoding)
*
* Start a stream emission with +encoding+
*
* See Psych::Handler#start_stream
*/
static VALUE start_stream(VALUE self, VALUE encoding)
{
yaml_emitter_t * emitter;
yaml_event_t event;
Data_Get_Struct(self, yaml_emitter_t, emitter);
Check_Type(encoding, T_FIXNUM);
yaml_stream_start_event_initialize(&event, (yaml_encoding_t)NUM2INT(encoding));
emit(emitter, &event);
return self;
}
/* call-seq: emitter.end_stream
*
* End a stream emission
*
* See Psych::Handler#end_stream
*/
static VALUE end_stream(VALUE self)
{
yaml_emitter_t * emitter;
yaml_event_t event;
Data_Get_Struct(self, yaml_emitter_t, emitter);
yaml_stream_end_event_initialize(&event);
emit(emitter, &event);
return self;
}
/* call-seq: emitter.start_document(version, tags, implicit)
*
* Start a document emission with YAML +version+, +tags+, and an +implicit+
* start.
*
* See Psych::Handler#start_document
*/
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;
Data_Get_Struct(self, yaml_emitter_t, 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)) {
int i = 0;
#ifdef HAVE_RUBY_ENCODING_H
rb_encoding * encoding = rb_utf8_encoding();
#endif
Check_Type(tags, T_ARRAY);
head = xcalloc((size_t)RARRAY_LEN(tags), sizeof(yaml_tag_directive_t));
tail = head;
for(i = 0; i < RARRAY_LEN(tags); i++) {
VALUE tuple = RARRAY_PTR(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_PTR(tuple)[0];
value = RARRAY_PTR(tuple)[1];
#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 *)StringValuePtr(name);
tail->prefix = (yaml_char_t *)StringValuePtr(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;
}
/* call-seq: emitter.end_document(implicit)
*
* End a document emission with an +implicit+ ending.
*
* See Psych::Handler#end_document
*/
static VALUE end_document(VALUE self, VALUE imp)
{
yaml_emitter_t * emitter;
yaml_event_t event;
Data_Get_Struct(self, yaml_emitter_t, emitter);
yaml_document_end_event_initialize(&event, imp ? 1 : 0);
emit(emitter, &event);
return self;
}
/* call-seq: emitter.scalar(value, anchor, tag, plain, quoted, style)
*
* Emit a scalar with +value+, +anchor+, +tag+, and a +plain+ or +quoted+
* string type with +style+.
*
* See Psych::Handler#scalar
*/
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
Data_Get_Struct(self, yaml_emitter_t, 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;
}
/* call-seq: emitter.start_sequence(anchor, tag, implicit, style)
*
* Start emitting a sequence with +anchor+, a +tag+, +implicit+ sequence
* start and end, along with +style+.
*
* See Psych::Handler#start_sequence
*/
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
Data_Get_Struct(self, yaml_emitter_t, 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;
}
/* call-seq: emitter.end_sequence
*
* End sequence emission.
*
* See Psych::Handler#end_sequence
*/
static VALUE end_sequence(VALUE self)
{
yaml_emitter_t * emitter;
yaml_event_t event;
Data_Get_Struct(self, yaml_emitter_t, emitter);
yaml_sequence_end_event_initialize(&event);
emit(emitter, &event);
return self;
}
/* call-seq: emitter.start_mapping(anchor, tag, implicit, style)
*
* Start emitting a YAML map with +anchor+, +tag+, an +implicit+ start
* and end, and +style+.
*
* See Psych::Handler#start_mapping
*/
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
Data_Get_Struct(self, yaml_emitter_t, 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;
}
/* call-seq: emitter.end_mapping
*
* Emit the end of a mapping.
*
* See Psych::Handler#end_mapping
*/
static VALUE end_mapping(VALUE self)
{
yaml_emitter_t * emitter;
yaml_event_t event;
Data_Get_Struct(self, yaml_emitter_t, emitter);
yaml_mapping_end_event_initialize(&event);
emit(emitter, &event);
return self;
}
/* call-seq: emitter.alias(anchor)
*
* Emit an alias with +anchor+.
*
* See Psych::Handler#alias
*/
static VALUE alias(VALUE self, VALUE anchor)
{
yaml_emitter_t * emitter;
yaml_event_t event;
Data_Get_Struct(self, yaml_emitter_t, 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;
}
/* call-seq: emitter.canonical = true
*
* Set the output style to canonical, or not.
*/
static VALUE set_canonical(VALUE self, VALUE style)
{
yaml_emitter_t * emitter;
Data_Get_Struct(self, yaml_emitter_t, emitter);
yaml_emitter_set_canonical(emitter, Qtrue == style ? 1 : 0);
return style;
}
/* call-seq: emitter.canonical
*
* Get the output style, canonical or not.
*/
static VALUE canonical(VALUE self)
{
yaml_emitter_t * emitter;
Data_Get_Struct(self, yaml_emitter_t, emitter);
return (emitter->canonical == 0) ? Qfalse : Qtrue;
}
/* call-seq: emitter.indentation = level
*
* Set the indentation level to +level+. The level must be less than 10 and
* greater than 1.
*/
static VALUE set_indentation(VALUE self, VALUE level)
{
yaml_emitter_t * emitter;
Data_Get_Struct(self, yaml_emitter_t, emitter);
yaml_emitter_set_indent(emitter, NUM2INT(level));
return level;
}
/* call-seq: emitter.indentation
*
* Get the indentation level.
*/
static VALUE indentation(VALUE self)
{
yaml_emitter_t * emitter;
Data_Get_Struct(self, yaml_emitter_t, emitter);
return INT2NUM(emitter->best_indent);
}
/* call-seq: emitter.line_width
*
* Get the preferred line width.
*/
static VALUE line_width(VALUE self)
{
yaml_emitter_t * emitter;
Data_Get_Struct(self, yaml_emitter_t, emitter);
return INT2NUM(emitter->best_width);
}
/* call-seq: emitter.line_width = width
*
* Set the preferred line with to +width+.
*/
static VALUE set_line_width(VALUE self, VALUE width)
{
yaml_emitter_t * emitter;
Data_Get_Struct(self, yaml_emitter_t, emitter);
yaml_emitter_set_width(emitter, NUM2INT(width));
return width;
}
void Init_psych_emitter()
{
VALUE psych = rb_define_module("Psych");
VALUE handler = rb_define_class_under(psych, "Handler", rb_cObject);
cPsychEmitter = rb_define_class_under(psych, "Emitter", handler);
rb_define_alloc_func(cPsychEmitter, allocate);
rb_define_method(cPsychEmitter, "initialize", initialize, 1);
rb_define_method(cPsychEmitter, "start_stream", start_stream, 1);
rb_define_method(cPsychEmitter, "end_stream", end_stream, 0);
rb_define_method(cPsychEmitter, "start_document", start_document, 3);
rb_define_method(cPsychEmitter, "end_document", end_document, 1);
rb_define_method(cPsychEmitter, "scalar", scalar, 6);
rb_define_method(cPsychEmitter, "start_sequence", start_sequence, 4);
rb_define_method(cPsychEmitter, "end_sequence", end_sequence, 0);
rb_define_method(cPsychEmitter, "start_mapping", start_mapping, 4);
rb_define_method(cPsychEmitter, "end_mapping", end_mapping, 0);
rb_define_method(cPsychEmitter, "alias", alias, 1);
rb_define_method(cPsychEmitter, "canonical", canonical, 0);
rb_define_method(cPsychEmitter, "canonical=", set_canonical, 1);
rb_define_method(cPsychEmitter, "indentation", indentation, 0);
rb_define_method(cPsychEmitter, "indentation=", set_indentation, 1);
rb_define_method(cPsychEmitter, "line_width", line_width, 0);
rb_define_method(cPsychEmitter, "line_width=", set_line_width, 1);
id_write = rb_intern("write");
}
/* vim: set noet sws=4 sw=4: */