xmlbuilder.cc revision f74420b3285b9fe04a7e00aa3b8c0ab07ea344bc 
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
39namespace buzz {
40
41XmlBuilder::XmlBuilder() :
42  pelCurrent_(NULL),
43  pelRoot_(NULL),
44  pvParents_(new std::vector<XmlElement *>()) {
45}
46
47void
48XmlBuilder::Reset() {
49  pelRoot_.reset();
50  pelCurrent_ = NULL;
51  pvParents_->clear();
52}
53
54XmlElement *
55XmlBuilder::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
91void
92XmlBuilder::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
111void
112XmlBuilder::EndElement(XmlParseContext * pctx, const char * name) {
113  UNUSED(pctx);
114  UNUSED(name);
115  pelCurrent_ = pvParents_->back();
116  pvParents_->pop_back();
117}
118
119void
120XmlBuilder::CharacterData(XmlParseContext * pctx,
121                               const char * text, int len) {
122  UNUSED(pctx);
123  if (pelCurrent_) {
124    pelCurrent_->AddParsedText(text, len);
125  }
126}
127
128void
129XmlBuilder::Error(XmlParseContext * pctx, XML_Error err) {
130  UNUSED(pctx);
131  UNUSED(err);
132  pelRoot_.reset(NULL);
133  pelCurrent_ = NULL;
134  pvParents_->clear();
135}
136
137XmlElement *
138XmlBuilder::CreateElement() {
139  return pelRoot_.release();
140}
141
142XmlElement *
143XmlBuilder::BuiltElement() {
144  return pelRoot_.get();
145}
146
147XmlBuilder::~XmlBuilder() {
148}
149
150
151
152}
153