/* Interface to libxml2.
Copyright (C) 2010-2012 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#ifdef HAVE_LIBXML2
#include <setjmp.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/HTMLparser.h>
#include "lisp.h"
#include "character.h"
#include "buffer.h"
static Lisp_Object Qlibxml2_dll;
#ifdef WINDOWSNT
#include <windows.h>
#include "w32.h"
/* Macro for defining functions that will be loaded from the libxml2 DLL. */
#define DEF_XML2_FN(rettype,func,args) static rettype (FAR CDECL *fn_##func)args
/* Macro for loading libxml2 functions from the library. */
#define LOAD_XML2_FN(lib,func) { \
fn_##func = (void *) GetProcAddress (lib, #func); \
if (!fn_##func) goto bad_library; \
}
DEF_XML2_FN (htmlDocPtr, htmlReadMemory,
(const char *, int, const char *, const char *, int));
DEF_XML2_FN (xmlDocPtr, xmlReadMemory,
(const char *, int, const char *, const char *, int));
DEF_XML2_FN (xmlNodePtr, xmlDocGetRootElement, (xmlDocPtr));
DEF_XML2_FN (void, xmlFreeDoc, (xmlDocPtr));
DEF_XML2_FN (void, xmlCleanupParser, (void));
DEF_XML2_FN (void, xmlCheckVersion, (int));
static int
libxml2_loaded_p (void)
{
Lisp_Object found = Fassq (Qlibxml2_dll, Vlibrary_cache);
if (CONSP (found))
return EQ (XCDR (found), Qt) ? 1 : 0;
return 0;
}
#else /* !WINDOWSNT */
#define fn_htmlReadMemory htmlReadMemory
#define fn_xmlReadMemory xmlReadMemory
#define fn_xmlDocGetRootElement xmlDocGetRootElement
#define fn_xmlFreeDoc xmlFreeDoc
#define fn_xmlCleanupParser xmlCleanupParser
#define fn_xmlCheckVersion xmlCheckVersion
static inline int
libxml2_loaded_p (void)
{
return 1;
}
#endif /* !WINDOWSNT */
static int
init_libxml2_functions (Lisp_Object libraries)
{
#ifdef WINDOWSNT
if (libxml2_loaded_p ())
return 1;
else
{
HMODULE library;
if (!(library = w32_delayed_load (libraries, Qlibxml2_dll)))
{
message ("%s", "libxml2 library not found");
return 0;
}
/* LOAD_XML2_FN jumps to bad_library if it fails to find the
named function. */
LOAD_XML2_FN (library, htmlReadMemory);
LOAD_XML2_FN (library, xmlReadMemory);
LOAD_XML2_FN (library, xmlDocGetRootElement);
LOAD_XML2_FN (library, xmlFreeDoc);
LOAD_XML2_FN (library, xmlCleanupParser);
LOAD_XML2_FN (library, xmlCheckVersion);
Vlibrary_cache = Fcons (Fcons (Qlibxml2_dll, Qt), Vlibrary_cache);
return 1;
}
bad_library:
Vlibrary_cache = Fcons (Fcons (Qlibxml2_dll, Qnil), Vlibrary_cache);
return 0;
#else /* !WINDOWSNT */
return 1;
#endif /* !WINDOWSNT */
}
static Lisp_Object
make_dom (xmlNode *node)
{
if (node->type == XML_ELEMENT_NODE)
{
Lisp_Object result = Fcons (intern ((char *) node->name), Qnil);
xmlNode *child;
xmlAttr *property;
Lisp_Object plist = Qnil;
/* First add the attributes. */
property = node->properties;
while (property != NULL)
{
if (property->children &&
property->children->content)
{
char *content = (char *) property->children->content;
plist = Fcons (Fcons (intern ((char *) property->name),
build_string (content)),
plist);
}
property = property->next;
}
result = Fcons (Fnreverse (plist), result);
/* Then add the children of the node. */
child = node->children;
while (child != NULL)
{
result = Fcons (make_dom (child), result);
child = child->next;
}
return Fnreverse (result);
}
else if (node->type == XML_TEXT_NODE || node->type == XML_CDATA_SECTION_NODE)
{
if (node->content)
return build_string ((char *) node->content);
else
return Qnil;
}
else if (node->type == XML_COMMENT_NODE)
{
if (node->content)
return list3 (intern ("comment"), Qnil,
build_string ((char *) node->content));
else
return Qnil;
}
else
return Qnil;
}
static Lisp_Object
parse_region (Lisp_Object start, Lisp_Object end, Lisp_Object base_url, int htmlp)
{
xmlDoc *doc;
Lisp_Object result = Qnil;
const char *burl = "";
ptrdiff_t bytes;
ptrdiff_t istart, iend;
fn_xmlCheckVersion (LIBXML_VERSION);
validate_region (&start, &end);
istart = XINT (start);
iend = XINT (end);
if (istart < GPT && GPT < iend)
move_gap (iend);
if (! NILP (base_url))
{
CHECK_STRING (base_url);
burl = SSDATA (base_url);
}
bytes = CHAR_TO_BYTE (iend) - CHAR_TO_BYTE (istart);
if (htmlp)
doc = fn_htmlReadMemory ((char *) BYTE_POS_ADDR (CHAR_TO_BYTE (istart)),
bytes, burl, "utf-8",
HTML_PARSE_RECOVER|HTML_PARSE_NONET|
HTML_PARSE_NOWARNING|HTML_PARSE_NOERROR|
HTML_PARSE_NOBLANKS);
else
doc = fn_xmlReadMemory ((char *) BYTE_POS_ADDR (CHAR_TO_BYTE (istart)),
bytes, burl, "utf-8",
XML_PARSE_NONET|XML_PARSE_NOWARNING|
XML_PARSE_NOBLANKS |XML_PARSE_NOERROR);
if (doc != NULL)
{
/* If the document is just comments, then this should get us the
nodes anyway. */
xmlNode *n = doc->children->next;
Lisp_Object r = Qnil;
while (n) {
if (!NILP (r))
result = Fcons (r, result);
r = make_dom (n);
n = n->next;
}
if (NILP (result)) {
/* The document isn't just comments, so get the tree the
proper way. */
xmlNode *node = fn_xmlDocGetRootElement (doc);
if (node != NULL)
result = make_dom (node);
} else
result = Fcons (intern ("top"),
Fcons (Qnil, Fnreverse (Fcons (r, result))));
fn_xmlFreeDoc (doc);
}
return result;
}
void
xml_cleanup_parser (void)
{
if (libxml2_loaded_p ())
fn_xmlCleanupParser ();
}
DEFUN ("libxml-parse-html-region", Flibxml_parse_html_region,
Slibxml_parse_html_region,
2, 3, 0,
doc: /* Parse the region as an HTML document and return the parse tree.
If BASE-URL is non-nil, it is used to expand relative URLs. */)
(Lisp_Object start, Lisp_Object end, Lisp_Object base_url)
{
if (init_libxml2_functions (Vdynamic_library_alist))
return parse_region (start, end, base_url, 1);
return Qnil;
}
DEFUN ("libxml-parse-xml-region", Flibxml_parse_xml_region,
Slibxml_parse_xml_region,
2, 3, 0,
doc: /* Parse the region as an XML document and return the parse tree.
If BASE-URL is non-nil, it is used to expand relative URLs. */)
(Lisp_Object start, Lisp_Object end, Lisp_Object base_url)
{
if (init_libxml2_functions (Vdynamic_library_alist))
return parse_region (start, end, base_url, 0);
return Qnil;
}
/***********************************************************************
Initialization
***********************************************************************/
void
syms_of_xml (void)
{
defsubr (&Slibxml_parse_html_region);
defsubr (&Slibxml_parse_xml_region);
DEFSYM (Qlibxml2_dll, "libxml2");
}
#endif /* HAVE_LIBXML2 */