blob: b267414bcc5dfeeb56a6921f545c2aad32a65557 [file] [log] [blame]
/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/xmllite/xmlparser.h"
#include <string>
#include <vector>
#include "talk/base/common.h"
#include "talk/xmllite/xmlconstants.h"
#include "talk/xmllite/xmlelement.h"
#include "talk/xmllite/xmlnsstack.h"
#include "talk/xmllite/xmlnsstack.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) :
context_(this), 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(XmlParser *parser) :
parser_(parser),
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 ? std::string(prefix) : STR_EMPTY,
// ns == NS_CLIENT ? NS_CLIENT :
// ns == NS_ROSTER ? NS_ROSTER :
// ns == NS_GR ? NS_GR :
std::string(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::string * result;
result = xmlnsstack_.NsForPrefix(std::string(qname, c - qname));
if (result == NULL)
return QN_EMPTY;
const char * localname = c + 1;
return QName(*result, localname);
}
}
if (isAttr) {
return QName(STR_EMPTY, qname);
}
const std::string * result;
result = xmlnsstack_.NsForPrefix(STR_EMPTY);
if (result == NULL)
return QN_EMPTY;
return QName(*result, 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() {
}
}