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CommonMark.xs
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CommonMark.xs
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/*
* Notes on memory management
*
* - A pointer to the Perl SV representing a node is stored in the
* user data slot of `struct cmark_node`, so there's a 1:1 mapping
* between Perl and C objects.
* - Every node SV keeps a reference to the parent SV. This is done
* indirectly by looking up the parent SV and increasing its refcount.
* - This makes sure that a document isn't freed if the last reference
* from Perl to the root node is dropped, as references to child nodes
* might still exist.
* - As a consequence, as long as a node is referenced from Perl, all its
* ancestor nodes will also be associated with a Perl object.
*/
#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include <stdlib.h>
#include <cmark.h>
#if CMARK_VERSION < 0x001500
#error libcmark 0.21.0 is required.
#endif
#if PERL_VERSION <= 14
#define sv_derived_from_pvn(sv, name, len, flags) sv_derived_from(sv, name)
#endif
/* Fix prefixes of render functions. */
#define cmark_node_render_html cmark_render_html
#define cmark_node_render_xml cmark_render_xml
#define cmark_node_render_man cmark_render_man
#define cmark_node_render_commonmark cmark_render_commonmark
#define cmark_node_render_latex cmark_render_latex
static SV*
S_create_or_incref_node_sv(pTHX_ cmark_node *node) {
SV *new_obj = NULL;
while (node) {
SV *obj;
HV *stash;
/* Look for existing object. */
obj = (SV*)cmark_node_get_user_data(node);
if (obj) {
/* Incref if found. */
SvREFCNT_inc_simple_void_NN(obj);
if (!new_obj) {
new_obj = obj;
}
break;
}
/* Create a new SV. */
obj = newSViv(PTR2IV(node));
cmark_node_set_user_data(node, obj);
if (!new_obj) {
new_obj = obj;
}
/*
* Unfortunately, Perl doesn't offer an API function to bless an SV
* without a reference. The following code is mostly copied from
* sv_bless.
*/
SvOBJECT_on(obj);
#if PERL_VERSION <= 16
PL_sv_objcount++;
#endif
SvUPGRADE(obj, SVt_PVMG);
stash = gv_stashpvn("CommonMark::Node", 16, GV_ADD);
SvSTASH_set(obj, (HV*)SvREFCNT_inc(stash));
/* Recurse into parent. */
node = cmark_node_parent(node);
}
return new_obj;
}
static void
S_decref_node_sv(pTHX_ cmark_node *node) {
SV *obj;
if (!node) {
return;
}
obj = (SV*)cmark_node_get_user_data(node);
if (!obj) {
/* Should never happen. */
croak("Internal error: node SV not found");
}
SvREFCNT_dec(obj);
}
/* Find or create an SV for a cmark_node. */
static SV*
S_node2sv(pTHX_ cmark_node *node) {
SV *obj;
if (!node) {
return &PL_sv_undef;
}
obj = S_create_or_incref_node_sv(aTHX_ node);
return newRV_noinc(obj);
}
/* Transfer refcount from a node to another. */
static void
S_transfer_refcount(pTHX_ cmark_node *from, cmark_node *to) {
if (from != to) {
S_create_or_incref_node_sv(aTHX_ to);
S_decref_node_sv(aTHX_ from);
}
}
/* Get C struct pointer from an SV argument. */
static void*
S_sv2c(pTHX_ SV *sv, const char *class_name, STRLEN len, CV *cv,
const char *var_name) {
if (!SvROK(sv) || !sv_derived_from_pvn(sv, class_name, len, 0)) {
const char *sub_name = GvNAME(CvGV(cv));
croak("%s: %s is not of type %s", sub_name, var_name, class_name);
}
return INT2PTR(void*, SvIV(SvRV(sv)));
}
MODULE = CommonMark PACKAGE = CommonMark PREFIX = cmark_
PROTOTYPES: DISABLE
BOOT:
if (cmark_version() != CMARK_VERSION) {
warn("Compiled against libcmark %s, but runtime version is %s",
CMARK_VERSION_STRING, cmark_version_string());
}
char*
cmark_markdown_to_html(package, string, options = 0)
SV *package = NO_INIT
SV *string
int options
PREINIT:
STRLEN len;
const char *buffer;
CODE:
(void)package;
buffer = SvPVutf8(string, len);
RETVAL = cmark_markdown_to_html(buffer, len, options);
OUTPUT:
RETVAL
cmark_node*
cmark_parse_document(package, string, options = 0)
SV *package = NO_INIT
SV *string
int options
PREINIT:
STRLEN len;
const char *buffer;
CODE:
(void)package;
buffer = SvPVutf8(string, len);
RETVAL = cmark_parse_document(buffer, len, options);
OUTPUT:
RETVAL
cmark_node*
cmark_parse_file(package, file, options = 0)
SV *package = NO_INIT
SV *file
int options
PREINIT:
PerlIO *perl_io;
FILE *stream = NULL;
CODE:
(void)package;
perl_io = IoIFP(sv_2io(file));
if (perl_io) {
stream = PerlIO_findFILE(perl_io);
}
if (!stream) {
croak("parse_file: file is not a file handle");
}
RETVAL = cmark_parse_file(stream, options);
OUTPUT:
RETVAL
int
cmark_version(package)
SV *package = NO_INIT
CODE:
(void)package;
RETVAL = cmark_version();
OUTPUT:
RETVAL
const char*
cmark_version_string(package)
SV *package = NO_INIT
CODE:
(void)package;
RETVAL = cmark_version_string();
OUTPUT:
RETVAL
int
cmark_compile_time_version(package)
SV *package = NO_INIT
CODE:
(void)package;
RETVAL = CMARK_VERSION;
OUTPUT:
RETVAL
const char*
cmark_compile_time_version_string(package)
SV *package = NO_INIT
CODE:
(void)package;
RETVAL = CMARK_VERSION_STRING;
OUTPUT:
RETVAL
MODULE = CommonMark PACKAGE = CommonMark::Node PREFIX = cmark_node_
cmark_node*
new(package, type)
SV *package = NO_INIT
cmark_node_type type
CODE:
(void)package;
RETVAL = cmark_node_new(type);
OUTPUT:
RETVAL
void
DESTROY(cmark_node *node)
CODE:
cmark_node *parent = cmark_node_parent(node);
if (parent) {
cmark_node_set_user_data(node, NULL);
S_decref_node_sv(aTHX_ parent);
}
else {
cmark_node_free(node);
}
cmark_iter*
iterator(cmark_node *node)
CODE:
S_create_or_incref_node_sv(aTHX_ node);
RETVAL = cmark_iter_new(node);
OUTPUT:
RETVAL
cmark_node*
interface_get_node(cmark_node *node)
INTERFACE:
cmark_node_next
cmark_node_previous
cmark_node_parent
cmark_node_first_child
cmark_node_last_child
int
interface_get_int(cmark_node *node)
INTERFACE:
cmark_node_get_type
cmark_node_get_header_level
cmark_node_get_list_type
cmark_node_get_list_delim
cmark_node_get_list_start
cmark_node_get_list_tight
cmark_node_get_start_line
cmark_node_get_start_column
cmark_node_get_end_line
cmark_node_get_end_column
NO_OUTPUT int
interface_set_int(cmark_node *node, int value)
INTERFACE:
cmark_node_set_header_level
cmark_node_set_list_type
cmark_node_set_list_delim
cmark_node_set_list_start
cmark_node_set_list_tight
POSTCALL:
if (!RETVAL) {
croak("%s: invalid operation", GvNAME(CvGV(cv)));
}
const char*
interface_get_utf8(cmark_node *node)
INTERFACE:
cmark_node_get_type_string
cmark_node_get_literal
cmark_node_get_title
cmark_node_get_url
cmark_node_get_fence_info
NO_OUTPUT int
interface_set_utf8(cmark_node *node, const char *value)
INTERFACE:
cmark_node_set_literal
cmark_node_set_title
cmark_node_set_url
cmark_node_set_fence_info
POSTCALL:
if (!RETVAL) {
croak("%s: invalid operation", GvNAME(CvGV(cv)));
}
void
cmark_node_unlink(cmark_node *node)
PREINIT:
cmark_node *old_parent;
INIT:
old_parent = cmark_node_parent(node);
POSTCALL:
S_decref_node_sv(aTHX_ old_parent);
NO_OUTPUT int
interface_move_node(cmark_node *node, cmark_node *other)
PREINIT:
cmark_node *old_parent;
cmark_node *new_parent;
INIT:
old_parent = cmark_node_parent(other);
INTERFACE:
cmark_node_insert_before
cmark_node_insert_after
cmark_node_prepend_child
cmark_node_append_child
POSTCALL:
if (!RETVAL) {
croak("%s: invalid operation", GvNAME(CvGV(cv)));
}
new_parent = cmark_node_parent(other);
S_transfer_refcount(aTHX_ old_parent, new_parent);
char*
interface_render(cmark_node *root, int options = 0)
INTERFACE:
cmark_node_render_html
cmark_node_render_xml
char*
interface_render_width(cmark_node *root, int options = 0, int width = 0)
INTERFACE:
cmark_node_render_man
cmark_node_render_commonmark
cmark_node_render_latex
MODULE = CommonMark PACKAGE = CommonMark::Iterator PREFIX = cmark_iter_
void
DESTROY(cmark_iter *iter)
CODE:
S_decref_node_sv(aTHX_ cmark_iter_get_node(iter));
S_decref_node_sv(aTHX_ cmark_iter_get_root(iter));
cmark_iter_free(iter);
void
cmark_iter_next(cmark_iter *iter)
PREINIT:
I32 gimme;
cmark_node *old_node;
cmark_event_type ev_type;
PPCODE:
gimme = GIMME_V;
old_node = cmark_iter_get_node(iter);
ev_type = cmark_iter_next(iter);
if (ev_type != CMARK_EVENT_DONE) {
cmark_node *node = cmark_iter_get_node(iter);
ST(0) = sv_2mortal(newSViv((IV)ev_type));
if (gimme == G_ARRAY) {
SV *obj = S_create_or_incref_node_sv(aTHX_ node);
/* A bit more efficient than S_transfer_refcount. */
if (old_node != node) {
S_decref_node_sv(aTHX_ old_node);
SvREFCNT_inc_simple_void_NN(obj);
}
ST(1) = sv_2mortal(newRV_noinc(obj));
XSRETURN(2);
}
else {
S_transfer_refcount(aTHX_ old_node, node);
XSRETURN(1);
}
}
else {
S_decref_node_sv(aTHX_ old_node);
if (gimme == G_ARRAY) {
XSRETURN_EMPTY;
}
else {
ST(0) = sv_2mortal(newSViv((IV)ev_type));
XSRETURN(1);
}
}
cmark_node*
cmark_iter_get_node(cmark_iter *iter)
cmark_event_type
cmark_iter_get_event_type(cmark_iter *iter)
void
cmark_iter_reset(iter, node, event_type)
cmark_iter *iter
cmark_node *node
cmark_event_type event_type
PREINIT:
cmark_node *old_node;
INIT:
old_node = cmark_iter_get_node(iter);
S_transfer_refcount(aTHX_ old_node, node);
MODULE = CommonMark PACKAGE = CommonMark::Parser PREFIX = cmark_parser_
cmark_parser*
cmark_parser_new(package, options = 0)
SV *package = NO_INIT
int options
CODE:
(void)package;
RETVAL = cmark_parser_new(options);
OUTPUT:
RETVAL
void
DESTROY(cmark_parser *parser)
CODE:
cmark_parser_free(parser);
void
cmark_parser_feed(cmark_parser *parser, SV *string)
PREINIT:
STRLEN len;
const char *buffer;
CODE:
buffer = SvPVutf8(string, len);
cmark_parser_feed(parser, buffer, len);
cmark_node*
cmark_parser_finish(cmark_parser *parser)