mirror of
https://github.com/cookiengineer/audacity
synced 2026-02-10 05:30:01 +01:00
5e7d41ec07
... except Audacity.h This forces us to make each header contain all forward declarations or nested headers that it requires, rather than depend on context.
132 lines
3.3 KiB
C++
132 lines
3.3 KiB
C++
/**********************************************************************
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Audacity: A Digital Audio Editor
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XMLFileReader.cpp
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Dominic Mazzoni
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*******************************************************************//**
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\class XMLFileReader
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\brief Reads a file and passes the results through an XMLTagHandler.
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*//*******************************************************************/
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#include "XMLFileReader.h"
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#include <wx/defs.h>
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#include <wx/ffile.h>
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#include <wx/intl.h>
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#include <string.h>
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#include "../Internat.h"
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XMLFileReader::XMLFileReader()
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{
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mParser = XML_ParserCreate(NULL);
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XML_SetUserData(mParser, (void *)this);
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XML_SetElementHandler(mParser, startElement, endElement);
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XML_SetCharacterDataHandler(mParser, charHandler);
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mBaseHandler = NULL;
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mHandler.reserve(128);
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}
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XMLFileReader::~XMLFileReader()
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{
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XML_ParserFree(mParser);
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}
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bool XMLFileReader::Parse(XMLTagHandler *baseHandler,
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const FilePath &fname)
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{
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wxFFile theXMLFile(fname, wxT("rb"));
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if (!theXMLFile.IsOpened()) {
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mErrorStr.Printf(_("Could not open file: \"%s\""), fname);
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return false;
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}
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mBaseHandler = baseHandler;
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const size_t bufferSize = 16384;
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char buffer[16384];
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int done = 0;
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do {
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size_t len = fread(buffer, 1, bufferSize, theXMLFile.fp());
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done = (len < bufferSize);
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if (!XML_Parse(mParser, buffer, len, done)) {
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mErrorStr.Printf(_("Error: %hs at line %lu"),
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XML_ErrorString(XML_GetErrorCode(mParser)),
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(long unsigned int)XML_GetCurrentLineNumber(mParser));
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theXMLFile.Close();
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return false;
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}
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} while (!done);
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theXMLFile.Close();
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// Even though there were no parse errors, we only succeed if
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// the first-level handler actually got called, and didn't
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// return false.
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if (mBaseHandler)
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return true;
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else {
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mErrorStr.Printf(_("Could not load file: \"%s\""), fname);
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return false;
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}
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}
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wxString XMLFileReader::GetErrorStr()
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{
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return mErrorStr;
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}
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// static
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void XMLFileReader::startElement(void *userData, const char *name,
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const char **atts)
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{
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XMLFileReader *This = (XMLFileReader *)userData;
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Handlers &handlers = This->mHandler;
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if (handlers.empty()) {
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handlers.push_back(This->mBaseHandler);
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}
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else {
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if (XMLTagHandler *const handler = handlers.back())
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handlers.push_back(handler->ReadXMLChild(name));
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else
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handlers.push_back(NULL);
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}
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if (XMLTagHandler *& handler = handlers.back()) {
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if (!handler->ReadXMLTag(name, atts)) {
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handler = nullptr;
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if (handlers.size() == 1)
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This->mBaseHandler = nullptr;
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}
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}
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}
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// static
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void XMLFileReader::endElement(void *userData, const char *name)
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{
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XMLFileReader *This = (XMLFileReader *)userData;
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Handlers &handlers = This->mHandler;
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if (XMLTagHandler *const handler = handlers.back())
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handler->ReadXMLEndTag(name);
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handlers.pop_back();
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}
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// static
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void XMLFileReader::charHandler(void *userData, const char *s, int len)
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{
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XMLFileReader *This = (XMLFileReader *)userData;
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Handlers &handlers = This->mHandler;
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if (XMLTagHandler *const handler = handlers.back())
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handler->ReadXMLContent(s, len);
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}
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