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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 "talk/xmllite/xmlbuilder.h"
     29 
     30 #include <vector>
     31 #include <set>
     32 #include "talk/base/common.h"
     33 #include "talk/xmllite/xmlconstants.h"
     34 #include "talk/xmllite/xmlelement.h"
     35 
     36 namespace buzz {
     37 
     38 XmlBuilder::XmlBuilder() :
     39   pelCurrent_(NULL),
     40   pelRoot_(),
     41   pvParents_(new std::vector<XmlElement *>()) {
     42 }
     43 
     44 void
     45 XmlBuilder::Reset() {
     46   pelRoot_.reset();
     47   pelCurrent_ = NULL;
     48   pvParents_->clear();
     49 }
     50 
     51 XmlElement *
     52 XmlBuilder::BuildElement(XmlParseContext * pctx,
     53                               const char * name, const char ** atts) {
     54   QName tagName(pctx->ResolveQName(name, false));
     55   if (tagName.IsEmpty())
     56     return NULL;
     57 
     58   XmlElement * pelNew = new XmlElement(tagName);
     59 
     60   if (!*atts)
     61     return pelNew;
     62 
     63   std::set<QName> seenNonlocalAtts;
     64 
     65   while (*atts) {
     66     QName attName(pctx->ResolveQName(*atts, true));
     67     if (attName.IsEmpty()) {
     68       delete pelNew;
     69       return NULL;
     70     }
     71 
     72     // verify that namespaced names are unique
     73     if (!attName.Namespace().empty()) {
     74       if (seenNonlocalAtts.count(attName)) {
     75         delete pelNew;
     76         return NULL;
     77       }
     78       seenNonlocalAtts.insert(attName);
     79     }
     80 
     81     pelNew->AddAttr(attName, std::string(*(atts + 1)));
     82     atts += 2;
     83   }
     84 
     85   return pelNew;
     86 }
     87 
     88 void
     89 XmlBuilder::StartElement(XmlParseContext * pctx,
     90                               const char * name, const char ** atts) {
     91   XmlElement * pelNew = BuildElement(pctx, name, atts);
     92   if (pelNew == NULL) {
     93     pctx->RaiseError(XML_ERROR_SYNTAX);
     94     return;
     95   }
     96 
     97   if (!pelCurrent_) {
     98     pelCurrent_ = pelNew;
     99     pelRoot_.reset(pelNew);
    100     pvParents_->push_back(NULL);
    101   } else {
    102     pelCurrent_->AddElement(pelNew);
    103     pvParents_->push_back(pelCurrent_);
    104     pelCurrent_ = pelNew;
    105   }
    106 }
    107 
    108 void
    109 XmlBuilder::EndElement(XmlParseContext * pctx, const char * name) {
    110   UNUSED(pctx);
    111   UNUSED(name);
    112   pelCurrent_ = pvParents_->back();
    113   pvParents_->pop_back();
    114 }
    115 
    116 void
    117 XmlBuilder::CharacterData(XmlParseContext * pctx,
    118                                const char * text, int len) {
    119   UNUSED(pctx);
    120   if (pelCurrent_) {
    121     pelCurrent_->AddParsedText(text, len);
    122   }
    123 }
    124 
    125 void
    126 XmlBuilder::Error(XmlParseContext * pctx, XML_Error err) {
    127   UNUSED(pctx);
    128   UNUSED(err);
    129   pelRoot_.reset(NULL);
    130   pelCurrent_ = NULL;
    131   pvParents_->clear();
    132 }
    133 
    134 XmlElement *
    135 XmlBuilder::CreateElement() {
    136   return pelRoot_.release();
    137 }
    138 
    139 XmlElement *
    140 XmlBuilder::BuiltElement() {
    141   return pelRoot_.get();
    142 }
    143 
    144 XmlBuilder::~XmlBuilder() {
    145 }
    146 
    147 }  // namespace buzz
    148