einstein/streams.cpp

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2013-09-21 21:05:25 +00:00
#include "streams.h"
#include "exceptions.h"
#include "unicode.h"
UtfStreamReader::UtfStreamReader(std::ifstream *s)
{
stream = s;
}
UtfStreamReader::~UtfStreamReader()
{
}
// This function is very slow because of poor fromUtf8 function design
wchar_t UtfStreamReader::getNextChar()
{
unsigned char buf[10];
if (0 < backBuf.size()) {
wchar_t wc = backBuf.front();
backBuf.pop_front();
return wc;
}
if (! stream->good())
throw Exception(L"Error reading from stream 1");
int sz = stream->readsome((char*)buf, 1);
if (1 != sz)
throw Exception(L"Error reading from stream 2");
int size = getUtf8Length(buf[0]);
if (size > 1) {
sz = stream->readsome((char*)buf + 1, size - 1);
if (size - 1 != sz)
throw Exception(L"Error reading from stream 3");
}
buf[size] = 0;
std::string s((char*)buf);
std::wstring ws(fromUtf8(s));
if (1 != ws.length())
throw Exception(L"Error converting UTF-8 character to wide character");
return ws[0];
}
void UtfStreamReader::ungetChar(wchar_t ch)
{
backBuf.push_back(ch);
}
bool UtfStreamReader::isEof()
{
if (stream->eof())
return true; // FIXME: it doesn't work. why?
return EOF == stream->peek();
}