public void Run()
{
if (endOfFile)
{
return;
}
char[] buffer = null;
var start = 0;
var current = 0;
var end = 0;
if (!input.ReadMore(ref buffer, ref start, ref current, ref end))
{
// cannot decode more data until next input chunk is available
return;
}
if (input.EndOfFile)
{
endOfFile = true;
}
if (end - start != 0)
{
if (!gotAnyText)
{
if (output is ConverterEncodingOutput)
{
var encodingOutput = output as ConverterEncodingOutput;
if (encodingOutput.CodePageSameAsInput)
{
if (input is ConverterDecodingInput)
{
encodingOutput.Encoding = (input as ConverterDecodingInput).Encoding;
}
else
{
encodingOutput.Encoding = Encoding.UTF8;
}
}
}
gotAnyText = true;
}
output.Write(buffer, start, end - start);
input.ReportProcessed(end - start);
}
if (endOfFile)
{
output.Flush();
}
}
public TextTokenId Parse()
{
char ch, chT;
CharClass charClass, charClassT;
bool forceFlushToken;
int runStart;
if (tokenBuilder.Valid)
{
// start the new token
input.ReportProcessed(parseCurrent - parseStart);
parseStart = parseCurrent;
tokenBuilder.Reset();
InternalDebug.Assert(tokenBuilder.TotalLength == 0);
}
while (true)
{
InternalDebug.Assert(parseThreshold > 0);
// try to read and decode more input data if necessary
forceFlushToken = false;
if (parseCurrent + parseThreshold > parseEnd)
{
if (!endOfFile)
{
if (!input.ReadMore(ref parseBuffer, ref parseStart, ref parseCurrent, ref parseEnd))
{
// cannot decode more data until next input chunk is available
// we may have incomplete token at this point
InternalDebug.Assert(!tokenBuilder.Valid);
return(TextTokenId.None);
}
// NOTE: in case of success, ReadMore can move the token in the buffer and / or
// switch to a new buffer
tokenBuilder.BufferChanged(parseBuffer, parseStart);
var decodingInput = input as ConverterDecodingInput;
if (decodingInput != null && decodingInput.EncodingChanged)
{
// reset the flag as required by ConverterInput protocol
decodingInput.EncodingChanged = false;
// signal encoding change to the caller
return(tokenBuilder.MakeEmptyToken(TextTokenId.EncodingChange, decodingInput.Encoding.CodePage));
}
if (input.EndOfFile)
{
endOfFile = true;
}
if (!endOfFile && parseEnd - parseStart < input.MaxTokenSize)
{
// we have successfuly read "something", ensure this something is above threshold
continue;
}
}
// end of file or token is too long, need to flush the token as is (split)
forceFlushToken = true;
}
// we should have read something unless this is EOF
InternalDebug.Assert(parseEnd > parseCurrent || forceFlushToken);
// compact, so that the next character (or parseThreshold next characters) are valid.
// get the next input character
ch = parseBuffer[parseCurrent];
charClass = ParseSupport.GetCharClass(ch);
if (ParseSupport.InvalidUnicodeCharacter(charClass) || parseThreshold > 1)
{
while (ParseSupport.InvalidUnicodeCharacter(charClass) && parseCurrent < parseEnd)
{
ch = parseBuffer[++parseCurrent];
charClass = ParseSupport.GetCharClass(ch);
}
if (parseThreshold > 1 && parseCurrent + 1 < parseEnd)
{
InternalDebug.Assert(parseCurrent == parseStart);
InternalDebug.Assert(!ParseSupport.InvalidUnicodeCharacter(ParseSupport.GetCharClass(parseBuffer[parseCurrent])));
var src = parseCurrent + 1;
var dst = parseCurrent + 1;
while (src < parseEnd && dst < parseCurrent + parseThreshold)
{
chT = parseBuffer[src];
charClassT = ParseSupport.GetCharClass(chT);
if (!ParseSupport.InvalidUnicodeCharacter(charClassT))
{
if (src != dst)
{
InternalDebug.Assert(ParseSupport.InvalidUnicodeCharacter(ParseSupport.GetCharClass(parseBuffer[dst])));
parseBuffer[dst] = chT; // move source character
parseBuffer[src] = '\0'; // replace source character with invalid (zero)
}
dst++;
}
src++;
}
if (src == parseEnd && parseCurrent + parseThreshold > dst)
{
Array.Copy(parseBuffer, parseCurrent, parseBuffer, parseEnd - (dst - parseCurrent), dst - parseCurrent);
parseCurrent = parseEnd - (dst - parseCurrent);
// reporting all invalid characters consumed
input.ReportProcessed(parseCurrent - parseStart);
parseStart = parseCurrent;
}
}
if (parseCurrent + parseThreshold > parseEnd)
{
// we still below threshold...
if (!forceFlushToken)
{
// go back and try to read more
continue;
}
// this is the end of file
if (parseCurrent == parseEnd && !tokenBuilder.IsStarted && endOfFile)
{
// EOF and token is empty, just return EOF token
break;
}
// this is the end of file, we cannot make it above threshold but still have some input data.
}
// reset the threshold to its default value
parseThreshold = 1;
}
// now parse the buffer content
runStart = parseCurrent;
InternalDebug.Assert(!tokenBuilder.IsStarted);
tokenBuilder.StartText(runStart);
while (tokenBuilder.PrepareToAddMoreRuns(9, runStart, RunKind.Text))
{
while (ParseSupport.TextUriCharacter(charClass))
{
ch = parseBuffer[++parseCurrent];
charClass = ParseSupport.GetCharClass(ch);
}
if (ParseSupport.TextNonUriCharacter(charClass))
{
if (parseCurrent != runStart)
{
// we have nonempty NWSP run
AddTextRun(RunTextType.NonSpace, runStart, parseCurrent);
}
runStart = parseCurrent;
do
{
ch = parseBuffer[++parseCurrent];
charClass = ParseSupport.GetCharClass(ch);
}while (ParseSupport.NbspCharacter(charClass));
AddTextRun(RunTextType.NonSpace, runStart, parseCurrent);
}
else if (ParseSupport.WhitespaceCharacter(charClass))
{
if (parseCurrent != runStart)
{
// we have nonempty NWSP run
AddTextRun(RunTextType.NonSpace, runStart, parseCurrent);
}
runStart = parseCurrent;
if (ch == ' ')
{
// ordinary space
chT = parseBuffer[parseCurrent + 1];
charClassT = ParseSupport.GetCharClass(chT);
if (!ParseSupport.WhitespaceCharacter(charClassT))
{
// add single space to text run
ch = chT;
charClass = charClassT;
parseCurrent++;
AddTextRun(RunTextType.Space, runStart, parseCurrent);
runStart = parseCurrent;
continue;
}
}
// this is a potentially collapsable whitespace, accumulate whitespace run(s)
ParseWhitespace(ch, charClass);
if (parseThreshold > 1)
{
// terminate the text parse loop to read more data
break;
}
runStart = parseCurrent;
ch = parseBuffer[parseCurrent];
charClass = ParseSupport.GetCharClass(ch);
}
else if (ParseSupport.NbspCharacter(charClass))
{
if (parseCurrent != runStart)
{
AddTextRun(RunTextType.NonSpace, runStart, parseCurrent);
}
runStart = parseCurrent;
do
{
ch = parseBuffer[++parseCurrent];
charClass = ParseSupport.GetCharClass(ch);
}while (ParseSupport.NbspCharacter(charClass));
AddTextRun(RunTextType.Nbsp, runStart, parseCurrent);
}
else
{
InternalDebug.Assert(ParseSupport.InvalidUnicodeCharacter(charClass));
// finish the "non-whitespace" run
if (parseCurrent != runStart)
{
AddTextRun(RunTextType.NonSpace, runStart, parseCurrent);
}
if (parseCurrent >= parseEnd)
{
// end of available input (EOB), flush the current text token
break;
}
// this is just an embedded invalid character, skip any such invalid
// characters and try to continue collecting text
do
{
ch = parseBuffer[++parseCurrent];
charClass = ParseSupport.GetCharClass(ch);
}while (ParseSupport.InvalidUnicodeCharacter(charClass) && parseCurrent < parseEnd);
}
// prepare for a new run
runStart = parseCurrent;
}
if (token.IsEmpty)
{
// text token is empty, we need more data
tokenBuilder.Reset(); // reset open text...
// reporting everything below parseCurrent consumed
input.ReportProcessed(parseCurrent - parseStart);
parseStart = parseCurrent;
continue;
}
// finish the current text token, return anything we have collected so far
tokenBuilder.EndText();
return((TextTokenId)token.TokenId);
}
return(tokenBuilder.MakeEmptyToken(TextTokenId.EndOfFile));
}
