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      1 /*
      2  * libjingle
      3  * Copyright 2004--2005, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include <vector>
     29 #include <set>
     30 #include "talk/base/common.h"
     31 #include "talk/xmllite/xmlelement.h"
     32 #include "talk/xmllite/xmlbuilder.h"
     33 #ifdef EXPAT_RELATIVE_PATH
     34 #include "lib/expat.h"
     35 #else
     36 #include "third_party/expat/v2_0_1/Source/lib/expat.h"
     37 #endif  // EXPAT_RELATIVE_PATH
     38 
     39 namespace buzz {
     40 
     41 XmlBuilder::XmlBuilder() :
     42   pelCurrent_(NULL),
     43   pelRoot_(NULL),
     44   pvParents_(new std::vector<XmlElement *>()) {
     45 }
     46 
     47 void
     48 XmlBuilder::Reset() {
     49   pelRoot_.reset();
     50   pelCurrent_ = NULL;
     51   pvParents_->clear();
     52 }
     53 
     54 XmlElement *
     55 XmlBuilder::BuildElement(XmlParseContext * pctx,
     56                               const char * name, const char ** atts) {
     57   QName tagName(pctx->ResolveQName(name, false));
     58   if (tagName == QN_EMPTY)
     59     return NULL;
     60 
     61   XmlElement * pelNew = new XmlElement(tagName);
     62 
     63   if (!*atts)
     64     return pelNew;
     65 
     66   std::set<QName> seenNonlocalAtts;
     67 
     68   while (*atts) {
     69     QName attName(pctx->ResolveQName(*atts, true));
     70     if (attName == QN_EMPTY) {
     71       delete pelNew;
     72       return NULL;
     73     }
     74 
     75     // verify that namespaced names are unique
     76     if (!attName.Namespace().empty()) {
     77       if (seenNonlocalAtts.count(attName)) {
     78         delete pelNew;
     79         return NULL;
     80       }
     81       seenNonlocalAtts.insert(attName);
     82     }
     83 
     84     pelNew->AddAttr(attName, std::string(*(atts + 1)));
     85     atts += 2;
     86   }
     87 
     88   return pelNew;
     89 }
     90 
     91 void
     92 XmlBuilder::StartElement(XmlParseContext * pctx,
     93                               const char * name, const char ** atts) {
     94   XmlElement * pelNew = BuildElement(pctx, name, atts);
     95   if (pelNew == NULL) {
     96     pctx->RaiseError(XML_ERROR_SYNTAX);
     97     return;
     98   }
     99 
    100   if (!pelCurrent_) {
    101     pelCurrent_ = pelNew;
    102     pelRoot_.reset(pelNew);
    103     pvParents_->push_back(NULL);
    104   } else {
    105     pelCurrent_->AddElement(pelNew);
    106     pvParents_->push_back(pelCurrent_);
    107     pelCurrent_ = pelNew;
    108   }
    109 }
    110 
    111 void
    112 XmlBuilder::EndElement(XmlParseContext * pctx, const char * name) {
    113   UNUSED(pctx);
    114   UNUSED(name);
    115   pelCurrent_ = pvParents_->back();
    116   pvParents_->pop_back();
    117 }
    118 
    119 void
    120 XmlBuilder::CharacterData(XmlParseContext * pctx,
    121                                const char * text, int len) {
    122   UNUSED(pctx);
    123   if (pelCurrent_) {
    124     pelCurrent_->AddParsedText(text, len);
    125   }
    126 }
    127 
    128 void
    129 XmlBuilder::Error(XmlParseContext * pctx, XML_Error err) {
    130   UNUSED(pctx);
    131   UNUSED(err);
    132   pelRoot_.reset(NULL);
    133   pelCurrent_ = NULL;
    134   pvParents_->clear();
    135 }
    136 
    137 XmlElement *
    138 XmlBuilder::CreateElement() {
    139   return pelRoot_.release();
    140 }
    141 
    142 XmlElement *
    143 XmlBuilder::BuiltElement() {
    144   return pelRoot_.get();
    145 }
    146 
    147 XmlBuilder::~XmlBuilder() {
    148 }
    149 
    150 
    151 
    152 }
    153