/* Interface to libxml2.
   Copyright (C) 2010 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 "buffer.h"

Lisp_Object make_dom (xmlNode *node)
{
  if (node->type == XML_ELEMENT_NODE) {
    Lisp_Object result = Fcons (intern (node->name), Qnil);
    xmlNode *child;
    xmlAttr *property;

    /* First add the attributes. */
    property = node->properties;
    while (property != NULL) {
      if (property->children &&
	  property->children->content) {
	char *pname = xmalloc (strlen (property->name) + 2);
	*pname = ':';
	strcpy(pname + 1, property->name);
	result = Fcons (Fcons (intern (pname),
			       build_string(property->children->content)),
			result);
	xfree (pname);
      }
      property = property->next;
    }
    /* 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) {
    Lisp_Object content = Qnil;

    if (node->content)
      content = build_string (node->content);

    return Fcons (intern (node->name), content);
  } else
    return Qnil;
}

static Lisp_Object
parse_buffer (Lisp_Object string, Lisp_Object base_url, int htmlp)
{
  xmlDoc *doc;
  xmlNode *node;
  Lisp_Object result;
  int ibeg, iend;
  char *burl = "";

  LIBXML_TEST_VERSION;

  CHECK_STRING (string);

  if (! NILP (base_url)) {
    CHECK_STRING (base_url);
    burl = SDATA (base_url);
  }

  if (htmlp)
    doc = htmlReadMemory (SDATA (string), SBYTES (string), burl, "utf-8",
			  HTML_PARSE_RECOVER|HTML_PARSE_NONET|
			  HTML_PARSE_NOWARNING|HTML_PARSE_NOERROR);
  else
    doc = xmlReadMemory (SDATA (string), SBYTES (string), burl, "utf-8",
			 XML_PARSE_NONET|XML_PARSE_NOWARNING|
			 XML_PARSE_NOERROR);

  if (doc != NULL) {
    node = xmlDocGetRootElement (doc);
    if (node != NULL)
      result = make_dom (node);

    xmlFreeDoc (doc);
    xmlCleanupParser ();
  }

  return result;
}

DEFUN ("html-parse-string", Fhtml_parse_string, Shtml_parse_string,
       1, 2, 0,
       doc: /* Parse STRING as an HTML document and return the parse tree.
If BASE-URL is non-nil, it will be used to expand relative URLs in
the HTML document.  */)
  (Lisp_Object string, Lisp_Object base_url)
{
  return parse_buffer (string, base_url, 1);
}

DEFUN ("xml-parse-string", Fxml_parse_string, Sxml_parse_string,
       1, 2, 0,
       doc: /* Parse STRING as an XML document and return the parse tree.
If BASE-URL is non-nil, it will be used to expand relative URLs in
the XML document.  */)
  (Lisp_Object string, Lisp_Object base_url)
{
  return parse_buffer (string, base_url, 0);
}


/***********************************************************************
			    Initialization
 ***********************************************************************/
void
syms_of_xml (void)
{
  defsubr (&Shtml_parse_string);
  defsubr (&Sxml_parse_string);
}

#endif /* HAVE_LIBXML2 */