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Implement html parser using libxml2

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branch : libxml2-html-parser
This commit is contained in:
Nimetu 2015-04-13 20:52:34 +03:00
parent 5d4cbdce26
commit 1dc48143f3
2 changed files with 187 additions and 0 deletions
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9
code/nel/include/nel/gui/group_html.h
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@ -102,6 +102,9 @@ namespace NLGUI
// Browse
virtual void browse (const char *url);
// parse html string using libxml2 parser
virtual bool parseHtml(std::string htmlString);
// Refresh
void refresh();
@ -199,6 +202,7 @@ namespace NLGUI
int luaBeginElement(CLuaState &ls);
int luaEndElement(CLuaState &ls);
int luaShowDiv(CLuaState &ls);
int luaParseHtml(CLuaState &ls);
REFLECT_EXPORT_START(CGroupHTML, CGroupScrollText)
REFLECT_LUA_METHOD("browse", luaBrowse)
@ -210,6 +214,7 @@ namespace NLGUI
REFLECT_LUA_METHOD("beginElement", luaBeginElement)
REFLECT_LUA_METHOD("endElement", luaEndElement)
REFLECT_LUA_METHOD("showDiv", luaShowDiv)
REFLECT_LUA_METHOD("parseHtml", luaParseHtml)
REFLECT_STRING("url", getURL, setURL)
REFLECT_FLOAT("timeout", getTimeout, setTimeout)
REFLECT_EXPORT_END
@ -251,6 +256,10 @@ namespace NLGUI
// the current request is terminated
virtual void requestTerminated(HTRequest *request);
// libxml2 html parser functions
void htmlElement(xmlNode *node, int element_number);
void htmlWalkDOM(xmlNode *a_node);
// Get Home URL
virtual std::string home();

178
code/nel/src/gui/group_html_parser.cpp Normal file
View file

@ -0,0 +1,178 @@
// Ryzom - MMORPG Framework <http://dev.ryzom.com/projects/ryzom/>
// Copyright (C) 2010 Winch Gate Property Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "stdpch.h"
#include <string>
#include <libxml/HTMLparser.h>
#include "nel/misc/types_nl.h"
#include "nel/gui/libwww.h"
#include "nel/gui/group_html.h"
#include "nel/gui/lua_ihm.h"
using namespace std;
using namespace NLMISC;
namespace NLGUI
{
// ***************************************************************************
void CGroupHTML::htmlElement(xmlNode *node, int element_number)
{
SGML_dtd *HTML_DTD = HTML_dtd ();
if (element_number < HTML_ELEMENTS)
{
CXMLAutoPtr ptr;
// load attributes into libwww structs
BOOL present[MAX_ATTRIBUTES];
const char *value[MAX_ATTRIBUTES];
std::string strvalues[MAX_ATTRIBUTES];
uint nbAttributes = std::min(MAX_ATTRIBUTES, HTML_DTD->tags[element_number].number_of_attributes);
for(uint i=0; i<nbAttributes; i++)
{
std::string name;
name = toLower(std::string(HTML_DTD->tags[element_number].attributes[i].name));
ptr = xmlGetProp(node, (const xmlChar *)name.c_str());
if (ptr)
{
// copy xmlChar to string (xmlChar will be released)
strvalues[i] = (const char *)(ptr);
// now use string pointer in value[] array
value[i] = strvalues[i].c_str();
present[i] = true;
}
else
{
value[i] = NULL;
present[i] = false;
}
}
if (element_number == HTML_A)
{
addLink(element_number, present, value);
}
beginElement(element_number, present, value);
}
else
{
beginUnparsedElement((const char *)(node->name), xmlStrlen(node->name));
}
// recursive - text content / child nodes
htmlWalkDOM(node->children);
// closing tag
if (element_number < HTML_ELEMENTS)
{
endElement(element_number);
}
else
{
endUnparsedElement((const char *)(node->name), xmlStrlen(node->name));
}
}
// ***************************************************************************
// recursive function to walk html document
void CGroupHTML::htmlWalkDOM(xmlNode *a_node)
{
SGML_dtd *HTML_DTD = HTML_dtd ();
uint element_number;
xmlNode *node = a_node;
while(node)
{
if (node->type == XML_TEXT_NODE)
{
addText((const char *)(node->content), xmlStrlen(node->content));
}
else
if (node->type == XML_ELEMENT_NODE)
{
// find libwww tag
for(element_number = 0; element_number<HTML_ELEMENTS; ++element_number)
{
if (xmlStrncasecmp(node->name, (const xmlChar *)HTML_DTD->tags[element_number].name, xmlStrlen(node->name)) == 0)
break;
}
htmlElement(node, element_number);
}
// move into next sibling
node = node->next;
}
}
// ***************************************************************************
bool CGroupHTML::parseHtml(std::string htmlString)
{
htmlParserCtxtPtr parser = htmlCreatePushParserCtxt(NULL, NULL, NULL, 0, NULL, XML_CHAR_ENCODING_NONE);
if (!parser)
{
nlwarning("Creating html parser context failed");
return false;
}
htmlCtxtUseOptions(parser, HTML_PARSE_NOBLANKS | HTML_PARSE_NOERROR | HTML_PARSE_NOWARNING | HTML_PARSE_NONET);
htmlParseChunk(parser, htmlString.c_str(), htmlString.size(), 0);
htmlParseChunk(parser, "", 0, 1);
bool success = true;
if (parser->myDoc)
{
xmlNode *root = xmlDocGetRootElement(parser->myDoc);
if (root)
{
htmlWalkDOM(root);
}
else
{
nlwarning("html root node failed");
success = false;
}
}
else
{
nlwarning("htmlstring parsing failed");
success = false;
}
htmlFreeParserCtxt(parser);
return success;
}
// ***************************************************************************
int CGroupHTML::luaParseHtml(CLuaState &ls)
{
const char *funcName = "parseHtml";
CLuaIHM::checkArgCount(ls, funcName, 1);
CLuaIHM::checkArgType(ls, funcName, 1, LUA_TSTRING);
std::string html = ls.toString(1);
parseHtml(html);
return 0;
}
}