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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "third_party/libjingle_xmpp/xmllite/xmlparser.h"
#include <string>
#include <vector>
#include "third_party/libjingle_xmpp/xmllite/xmlconstants.h"
#include "third_party/libjingle_xmpp/xmllite/xmlelement.h"
#include "third_party/libjingle_xmpp/xmllite/xmlnsstack.h"
#include "third_party/libjingle_xmpp/xmllite/xmlnsstack.h"
#include "third_party/webrtc/base/common.h"
namespace buzz {
static void
StartElementCallback(void * userData, const char *name, const char **atts) {
(static_cast<XmlParser *>(userData))->ExpatStartElement(name, atts);
}
static void
EndElementCallback(void * userData, const char *name) {
(static_cast<XmlParser *>(userData))->ExpatEndElement(name);
}
static void
CharacterDataCallback(void * userData, const char *text, int len) {
(static_cast<XmlParser *>(userData))->ExpatCharacterData(text, len);
}
static void
XmlDeclCallback(void * userData, const char * ver, const char * enc, int st) {
(static_cast<XmlParser *>(userData))->ExpatXmlDecl(ver, enc, st);
}
XmlParser::XmlParser(XmlParseHandler *pxph) :
pxph_(pxph), sentError_(false) {
expat_ = XML_ParserCreate(NULL);
XML_SetUserData(expat_, this);
XML_SetElementHandler(expat_, StartElementCallback, EndElementCallback);
XML_SetCharacterDataHandler(expat_, CharacterDataCallback);
XML_SetXmlDeclHandler(expat_, XmlDeclCallback);
}
void
XmlParser::Reset() {
if (!XML_ParserReset(expat_, NULL)) {
XML_ParserFree(expat_);
expat_ = XML_ParserCreate(NULL);
}
XML_SetUserData(expat_, this);
XML_SetElementHandler(expat_, StartElementCallback, EndElementCallback);
XML_SetCharacterDataHandler(expat_, CharacterDataCallback);
XML_SetXmlDeclHandler(expat_, XmlDeclCallback);
context_.Reset();
sentError_ = false;
}
static bool
XmlParser_StartsWithXmlns(const char *name) {
return name[0] == 'x' &&
name[1] == 'm' &&
name[2] == 'l' &&
name[3] == 'n' &&
name[4] == 's';
}
void
XmlParser::ExpatStartElement(const char *name, const char **atts) {
if (context_.RaisedError() != XML_ERROR_NONE)
return;
const char **att;
context_.StartElement();
for (att = atts; *att; att += 2) {
if (XmlParser_StartsWithXmlns(*att)) {
if ((*att)[5] == '\0') {
context_.StartNamespace("", *(att + 1));
}
else if ((*att)[5] == ':') {
if (**(att + 1) == '\0') {
// In XML 1.0 empty namespace illegal with prefix (not in 1.1)
context_.RaiseError(XML_ERROR_SYNTAX);
return;
}
context_.StartNamespace((*att) + 6, *(att + 1));
}
}
}
context_.SetPosition(XML_GetCurrentLineNumber(expat_),
XML_GetCurrentColumnNumber(expat_),
XML_GetCurrentByteIndex(expat_));
pxph_->StartElement(&context_, name, atts);
}
void
XmlParser::ExpatEndElement(const char *name) {
if (context_.RaisedError() != XML_ERROR_NONE)
return;
context_.EndElement();
context_.SetPosition(XML_GetCurrentLineNumber(expat_),
XML_GetCurrentColumnNumber(expat_),
XML_GetCurrentByteIndex(expat_));
pxph_->EndElement(&context_, name);
}
void
XmlParser::ExpatCharacterData(const char *text, int len) {
if (context_.RaisedError() != XML_ERROR_NONE)
return;
context_.SetPosition(XML_GetCurrentLineNumber(expat_),
XML_GetCurrentColumnNumber(expat_),
XML_GetCurrentByteIndex(expat_));
pxph_->CharacterData(&context_, text, len);
}
void
XmlParser::ExpatXmlDecl(const char * ver, const char * enc, int standalone) {
if (context_.RaisedError() != XML_ERROR_NONE)
return;
if (ver && std::string("1.0") != ver) {
context_.RaiseError(XML_ERROR_SYNTAX);
return;
}
if (standalone == 0) {
context_.RaiseError(XML_ERROR_SYNTAX);
return;
}
if (enc && !((enc[0] == 'U' || enc[0] == 'u') &&
(enc[1] == 'T' || enc[1] == 't') &&
(enc[2] == 'F' || enc[2] == 'f') &&
enc[3] == '-' && enc[4] =='8')) {
context_.RaiseError(XML_ERROR_INCORRECT_ENCODING);
return;
}
}
bool
XmlParser::Parse(const char *data, size_t len, bool isFinal) {
if (sentError_)
return false;
if (XML_Parse(expat_, data, static_cast<int>(len), isFinal) !=
XML_STATUS_OK) {
context_.SetPosition(XML_GetCurrentLineNumber(expat_),
XML_GetCurrentColumnNumber(expat_),
XML_GetCurrentByteIndex(expat_));
context_.RaiseError(XML_GetErrorCode(expat_));
}
if (context_.RaisedError() != XML_ERROR_NONE) {
sentError_ = true;
pxph_->Error(&context_, context_.RaisedError());
return false;
}
return true;
}
XmlParser::~XmlParser() {
XML_ParserFree(expat_);
}
void
XmlParser::ParseXml(XmlParseHandler *pxph, std::string text) {
XmlParser parser(pxph);
parser.Parse(text.c_str(), text.length(), true);
}
XmlParser::ParseContext::ParseContext() :
xmlnsstack_(),
raised_(XML_ERROR_NONE),
line_number_(0),
column_number_(0),
byte_index_(0) {
}
void
XmlParser::ParseContext::StartNamespace(const char *prefix, const char *ns) {
xmlnsstack_.AddXmlns(*prefix ? prefix : STR_EMPTY, ns);
}
void
XmlParser::ParseContext::StartElement() {
xmlnsstack_.PushFrame();
}
void
XmlParser::ParseContext::EndElement() {
xmlnsstack_.PopFrame();
}
QName
XmlParser::ParseContext::ResolveQName(const char* qname, bool isAttr) {
const char *c;
for (c = qname; *c; ++c) {
if (*c == ':') {
const std::pair<std::string, bool> result =
xmlnsstack_.NsForPrefix(std::string(qname, c - qname));
if (!result.second)
return QName();
return QName(result.first, c + 1);
}
}
if (isAttr)
return QName(STR_EMPTY, qname);
std::pair<std::string, bool> result = xmlnsstack_.NsForPrefix(STR_EMPTY);
if (!result.second)
return QName();
return QName(result.first, qname);
}
void
XmlParser::ParseContext::Reset() {
xmlnsstack_.Reset();
raised_ = XML_ERROR_NONE;
}
void
XmlParser::ParseContext::SetPosition(int line, int column,
long byte_index) {
line_number_ = line;
column_number_ = column;
byte_index_ = byte_index;
}
void
XmlParser::ParseContext::GetPosition(unsigned long * line,
unsigned long * column,
unsigned long * byte_index) {
if (line != NULL) {
*line = static_cast<unsigned long>(line_number_);
}
if (column != NULL) {
*column = static_cast<unsigned long>(column_number_);
}
if (byte_index != NULL) {
*byte_index = static_cast<unsigned long>(byte_index_);
}
}
XmlParser::ParseContext::~ParseContext() {
}
} // namespace buzz
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