shell/source/all/xml_parser.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include <xml_parser.hxx>
  22 #include <i_xml_parser_event_handler.hxx>
  23
  24 #ifdef _WIN32
  25 #include <utilities.hxx>
  26 #else
  27 #define UTF8ToWString(s) s
  28 #endif
  29
  30 #include <assert.h>
  31
  32 namespace /* private */
  33 {
  34
  35     /*  Extracts the local part of tag without
  36         namespace decoration e.g. meta:creator -> creator */
  37     const XML_Char COLON = ':';
  38
  39     const XML_Char* get_local_name(const XML_Char* rawname)
  40     {
  41         const XML_Char* p = rawname;
  42
  43         // go to the end
  44         while (*p) p++;
  45
  46         // go back until the first ':'
  47         while (*p != COLON && p > rawname)
  48             p--;
  49
  50         // if we are on a colon one step forward
  51         if (*p == COLON)
  52             p++;
  53
  54         return p;
  55     }
  56
  57     xml_parser* get_parser_instance(void* data)
  58     {
  59         return static_cast<xml_parser*>(XML_GetUserData(
  60             static_cast<XML_Parser>(data)));
  61     }
  62
  63     bool has_only_whitespaces(const XML_Char* s, int len)
  64     {
  65         const XML_Char* p = s;
  66         for (int i = 0; i < len; i++)
  67             if (*p++ != ' ') return false;
  68         return true;
  69     }
  70 }
  71
  72 xml_parser::xml_parser() :
  73     document_handler_(nullptr),
  74     xml_parser_(XML_ParserCreate(nullptr))
  75 {
  76     init();
  77 }
  78
  79 xml_parser::~xml_parser()
  80 {
  81     XML_ParserFree(xml_parser_);
  82 }
  83
  84 /* Callback functions will be called by the parser on
  85    different events */
  86
  87 extern "C"
  88 {
  89
  90 static void xml_start_element_handler(void* UserData, const XML_Char* name, const XML_Char** atts)
  91 {
  92     assert(UserData != nullptr);
  93
  94     xml_parser* pImpl  = get_parser_instance(UserData);
  95
  96     i_xml_parser_event_handler* pDocHdl = pImpl->get_document_handler();
  97     if (!pDocHdl)
  98         return;
  99
 100     xml_tag_attribute_container_t attributes;
 101
 102     int i = 0;
 103
 104     while(atts[i])
 105     {
 106         attributes[UTF8ToWString(reinterpret_cast<const char*>(get_local_name(atts[i])))] = UTF8ToWString(reinterpret_cast<const char*>(atts[i+1]));
 107         i += 2; // skip to next pair
 108     }
 109
 110     pDocHdl->start_element(
 111         UTF8ToWString(reinterpret_cast<const char*>(name)), UTF8ToWString(reinterpret_cast<const char*>(get_local_name(name))), attributes);
 112 }
 113
 114 static void xml_end_element_handler(void* UserData, const XML_Char* name)
 115 {
 116     assert(UserData);
 117
 118     xml_parser* pImpl  = get_parser_instance(UserData);
 119     i_xml_parser_event_handler* pDocHdl = pImpl->get_document_handler();
 120     if (pDocHdl)
 121         pDocHdl->end_element(UTF8ToWString(reinterpret_cast<const char*>(name)), UTF8ToWString(reinterpret_cast<const char*>(get_local_name(name))));
 122 }
 123
 124 static void xml_character_data_handler(void* UserData, const XML_Char* s, int len)
 125 {
 126     assert(UserData);
 127
 128     xml_parser* pImpl  = get_parser_instance(UserData);
 129     i_xml_parser_event_handler* pDocHdl = pImpl->get_document_handler();
 130     if (pDocHdl)
 131     {
 132         if (has_only_whitespaces(s,len))
 133             pDocHdl->ignore_whitespace(UTF8ToWString(std::string(reinterpret_cast<const char*>(s), len)));
 134         else
 135             pDocHdl->characters(UTF8ToWString(std::string(reinterpret_cast<const char*>(s), len)));
 136     }
 137 }
 138
 139 static void xml_comment_handler(void* UserData, const XML_Char* Data)
 140 {
 141     assert(UserData);
 142
 143     xml_parser* pImpl  = get_parser_instance(UserData);
 144     i_xml_parser_event_handler* pDocHdl = pImpl->get_document_handler();
 145     if (pDocHdl)
 146         pDocHdl->comment(UTF8ToWString(reinterpret_cast<const char*>(Data)));
 147 }
 148
 149 } // extern "C"
 150
 151 void xml_parser::init()
 152 {
 153     XML_SetUserData(xml_parser_, this);
 154
 155     // we use the parser as handler argument,
 156     // so we could use it if necessary, the
 157     // UserData are usable anyway using
 158     // XML_GetUserData(...)
 159     XML_UseParserAsHandlerArg(xml_parser_);
 160
 161     XML_SetElementHandler(
 162         xml_parser_,
 163         xml_start_element_handler,
 164         xml_end_element_handler);
 165
 166     XML_SetCharacterDataHandler(
 167         xml_parser_,
 168         xml_character_data_handler);
 169
 170     XML_SetCommentHandler(
 171         xml_parser_,
 172         xml_comment_handler);
 173 }
 174
 175 void xml_parser::parse(const char* XmlData, size_t Length, bool IsFinal)
 176 {
 177     if (XML_STATUS_ERROR ==
 178             XML_Parse(xml_parser_, XmlData, static_cast<int>(Length), IsFinal))
 179     {
 180         throw xml_parser_exception(
 181             XML_ErrorString(XML_GetErrorCode(xml_parser_)));
 182     }
 183 }
 184
 185 void xml_parser::set_document_handler(
 186     i_xml_parser_event_handler* event_handler)
 187 {
 188     document_handler_ = event_handler;
 189 }
 190
 191
 192 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */