Merged in nimetu/ryzomcore/libxml2-html-parser (pull request #127)
implement html parser using libxml2 --HG-- branch : develophg/feature/light_cycle^2
Jan Boon
10 years ago
commit
bc3624c42f
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// Ryzom - MMORPG Framework <http://dev.ryzom.com/projects/ryzom/>
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// Copyright (C) 2010 Winch Gate Property Limited
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "stdpch.h"
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#include <string>
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#include <libxml/HTMLparser.h>
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#include "nel/misc/types_nl.h"
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#include "nel/gui/libwww.h"
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#include "nel/gui/group_html.h"
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#include "nel/gui/lua_ihm.h"
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using namespace std;
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using namespace NLMISC;
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namespace NLGUI
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{
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// ***************************************************************************
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void CGroupHTML::htmlElement(xmlNode *node, int element_number)
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{
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SGML_dtd *HTML_DTD = HTML_dtd ();
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if (element_number < HTML_ELEMENTS)
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{
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CXMLAutoPtr ptr;
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// load attributes into libwww structs
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BOOL present[MAX_ATTRIBUTES];
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const char *value[MAX_ATTRIBUTES];
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std::string strvalues[MAX_ATTRIBUTES];
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uint nbAttributes = std::min(MAX_ATTRIBUTES, HTML_DTD->tags[element_number].number_of_attributes);
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for(uint i=0; i<nbAttributes; i++)
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{
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std::string name;
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name = toLower(std::string(HTML_DTD->tags[element_number].attributes[i].name));
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ptr = xmlGetProp(node, (const xmlChar *)name.c_str());
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if (ptr)
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{
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// copy xmlChar to string (xmlChar will be released)
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strvalues[i] = (const char *)(ptr);
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// now use string pointer in value[] array
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value[i] = strvalues[i].c_str();
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present[i] = true;
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}
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else
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{
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value[i] = NULL;
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present[i] = false;
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}
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}
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if (element_number == HTML_A)
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{
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addLink(element_number, present, value);
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}
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beginElement(element_number, present, value);
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}
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else
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{
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beginUnparsedElement((const char *)(node->name), xmlStrlen(node->name));
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}
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// recursive - text content / child nodes
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htmlWalkDOM(node->children);
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// closing tag
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if (element_number < HTML_ELEMENTS)
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{
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endElement(element_number);
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}
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else
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{
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endUnparsedElement((const char *)(node->name), xmlStrlen(node->name));
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}
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}
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// ***************************************************************************
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// recursive function to walk html document
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void CGroupHTML::htmlWalkDOM(xmlNode *a_node)
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{
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SGML_dtd *HTML_DTD = HTML_dtd ();
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uint element_number;
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xmlNode *node = a_node;
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while(node)
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{
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if (node->type == XML_TEXT_NODE)
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{
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addText((const char *)(node->content), xmlStrlen(node->content));
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}
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else
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if (node->type == XML_ELEMENT_NODE)
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{
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// find libwww tag
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for(element_number = 0; element_number<HTML_ELEMENTS; ++element_number)
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{
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if (xmlStrncasecmp(node->name, (const xmlChar *)HTML_DTD->tags[element_number].name, xmlStrlen(node->name)) == 0)
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break;
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}
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htmlElement(node, element_number);
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}
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// move into next sibling
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node = node->next;
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}
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}
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// ***************************************************************************
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bool CGroupHTML::parseHtml(std::string htmlString)
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{
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htmlParserCtxtPtr parser = htmlCreatePushParserCtxt(NULL, NULL, NULL, 0, NULL, XML_CHAR_ENCODING_NONE);
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if (!parser)
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{
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nlwarning("Creating html parser context failed");
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return false;
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}
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htmlCtxtUseOptions(parser, HTML_PARSE_NOBLANKS | HTML_PARSE_NOERROR | HTML_PARSE_NOWARNING | HTML_PARSE_NONET);
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htmlParseChunk(parser, htmlString.c_str(), htmlString.size(), 0);
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htmlParseChunk(parser, "", 0, 1);
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bool success = true;
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if (parser->myDoc)
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{
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xmlNode *root = xmlDocGetRootElement(parser->myDoc);
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if (root)
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{
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htmlWalkDOM(root);
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}
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else
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{
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nlwarning("html root node failed");
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success = false;
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}
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}
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else
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{
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nlwarning("htmlstring parsing failed");
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success = false;
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}
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htmlFreeParserCtxt(parser);
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return success;
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}
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// ***************************************************************************
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int CGroupHTML::luaParseHtml(CLuaState &ls)
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{
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const char *funcName = "parseHtml";
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CLuaIHM::checkArgCount(ls, funcName, 1);
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CLuaIHM::checkArgType(ls, funcName, 1, LUA_TSTRING);
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std::string html = ls.toString(1);
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parseHtml(html);
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return 0;
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}
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}
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