private bool ProcessChar(int i, char lineChar, out string errorText)
{
result = true;
errorText = null;
switch (parseState)
{
case ParseState.NotInParam:
if (lineChar == quoteChar)
{
parseState = ParseState.TextParam;
textParamIdx++;
startIdx = i;
textBldr.Clear();
quoted = true;
}
else
{
if (Array.IndexOf <char>(optionParamAnnouncerChars, lineChar) >= 0)
{
parseState = ParseState.OptionParam;
parseOptionState = ParseOptionState.Announced;
startIdx = i + 1;
}
else
{
if (Array.IndexOf <char>(parseTerminateChars, lineChar) >= 0)
{
ignoreRestOfLine = true;
}
else
{
if (!char.IsWhiteSpace(lineChar))
{
parseState = ParseState.TextParam;
textParamIdx++;
startIdx = i;
textBldr.Clear();
textBldr.Append(lineChar);
quoted = false;
}
}
}
}
break;
case ParseState.TextParam:
if (!quoted)
{
if (!char.IsWhiteSpace(lineChar))
{
textBldr.Append(lineChar);
}
else
{
result = ProcessTextParam(textParamIdx, textBldr.ToString(), startIdx, out errorText);
parseState = ParseState.NotInParam;
}
}
else
{
if (lineChar != QuoteChar)
{
textBldr.Append(lineChar);
}
else
{
parseState = ParseState.TextParamPossibleEndQuote;
}
}
break;
case ParseState.TextParamPossibleEndQuote:
if (lineChar == QuoteChar)
{
textBldr.Append(lineChar);
parseState = ParseState.TextParam;
}
else
{
if (char.IsWhiteSpace(lineChar))
{
result = ProcessTextParam(textParamIdx, textBldr.ToString(), startIdx, out errorText);
parseState = ParseState.NotInParam;
}
else
{
result = PrepareErrorText(CLParserError.Id.InvalidQuoteCharacterInTextParameter, textBldr.ToString(), out errorText);
}
}
break;
case ParseState.OptionParam:
switch (parseOptionState)
{
case ParseOptionState.Announced:
if (char.IsWhiteSpace(lineChar) || Array.IndexOf <char>(optionTerminationChars, lineChar) >= 0)
{
result = PrepareErrorText(CLParserError.Id.OptionNotSpecifiedAtLinePosition, i.ToString(), out errorText);
}
else
{
parseOptionState = ParseOptionState.Name;
}
break;
case ParseOptionState.Name:
bool optionValueAnnounced = lineChar == optionParamValueAnnouncerChar;
if (optionValueAnnounced || char.IsWhiteSpace(lineChar) || Array.IndexOf <char>(optionTerminationChars, lineChar) >= 0)
{
optionName = parseLine.Substring(startIdx, i - startIdx);
if (optionName == "")
{
result = PrepareErrorText(CLParserError.Id.OptionNotSpecifiedAtLinePosition, i.ToString(), out errorText);
}
else
{
if (optionValueAnnounced)
{
if (optionParamValueAnnouncerIsWhiteSpace)
{
parseOptionState = ParseOptionState.ValuePossible;
}
else
{
parseOptionState = ParseOptionState.ValueAnnounced;
}
}
else
{
result = ProcessOption(optionName, null, out errorText);
if (result)
{
parseState = ParseState.NotInParam;
}
}
}
}
break;
case ParseOptionState.ValuePossible:
if (!char.IsWhiteSpace(lineChar))
{
if (
Array.IndexOf <char>(optionParamAnnouncerChars, lineChar) < 0 // not a new option
&&
CanOptionHaveValue(optionName) // option can have values
)
{
parseOptionState = ParseOptionState.ValueAnnounced;
result = ProcessChar(i, lineChar, out errorText); // process first char of value
}
else
{
result = ProcessOption(optionName, null, out errorText); // process current option
if (result)
{
parseState = ParseState.NotInParam;
result = ProcessChar(i, lineChar, out errorText); // will handle new option/text param
}
}
}
break;
case ParseOptionState.ValueAnnounced:
startIdx = i;
textBldr.Clear();
if (char.IsWhiteSpace(lineChar))
{
result = ProcessOption(optionName, "", out errorText);
parseState = ParseState.NotInParam;
}
else
{
if (lineChar == QuoteChar)
{
quoted = true;
}
else
{
quoted = false;
textBldr.Append(lineChar);
}
parseOptionState = ParseOptionState.Value;
}
break;
case ParseOptionState.Value:
if (!quoted)
{
if (!char.IsWhiteSpace(lineChar))
{
textBldr.Append(lineChar);
}
else
{
result = ProcessOption(optionName, textBldr.ToString(), out errorText);
parseState = ParseState.NotInParam;
}
}
else
{
if (lineChar != QuoteChar)
{
textBldr.Append(lineChar);
}
else
{
parseOptionState = ParseOptionState.ValuePossibleEndQuote;
}
}
break;
case ParseOptionState.ValuePossibleEndQuote:
if (lineChar == QuoteChar)
{
textBldr.Append(lineChar);
parseOptionState = ParseOptionState.Value;
}
else
{
if (char.IsWhiteSpace(lineChar))
{
result = ProcessOption(optionName, textBldr.ToString(), out errorText);
parseState = ParseState.NotInParam;
}
else
{
result = PrepareErrorText(CLParserError.Id.InvalidQuoteCharacterInOptionValue, optionName, out errorText);
}
}
break;
}
break;
}
return(result);
}
public virtual bool Parse(string line, out string errorText)
{
parseLine = line;
textParamIdx = -1;
parseState = ParseState.NotInParam;
parseOptionState = ParseOptionState.Announced;
startIdx = -1;
optionName = null;
quoted = false;
ignoreRestOfLine = false;
textBldr = new StringBuilder(30);
optionTerminationChars = CreateOptionTerminationCharArray();
errorText = null;
for (int i = 0; i < line.Length; i++)
{
result = ProcessChar(i, line[i], out errorText);
if (!result || ignoreRestOfLine)
{
break;
}
}
if (result && !ignoreRestOfLine)
{
switch (parseState)
{
case ParseState.NotInParam:
break;
case ParseState.TextParam:
if (quoted)
{
result = PrepareErrorText(CLParserError.Id.TextMissingClosingQuoteCharacter, null, out errorText);
}
else
{
result = ProcessTextParam(textParamIdx, textBldr.ToString(), startIdx, out errorText);
}
break;
case ParseState.TextParamPossibleEndQuote:
result = ProcessTextParam(textParamIdx, textBldr.ToString(), startIdx, out errorText);
break;
case ParseState.OptionParam:
switch (parseOptionState)
{
case ParseOptionState.Announced:
result = PrepareErrorText(CLParserError.Id.OptionNotSpecifiedAtLinePosition, line.Length.ToString(), out errorText);
break;
case ParseOptionState.Name:
optionName = line.Substring(startIdx, line.Length - startIdx);
result = ProcessOption(optionName, null, out errorText);
break;
case ParseOptionState.ValuePossible:
result = ProcessOption(optionName, null, out errorText);
break;
case ParseOptionState.ValueAnnounced:
result = ProcessOption(optionName, "", out errorText);
break;
case ParseOptionState.Value:
if (quoted)
{
result = PrepareErrorText(CLParserError.Id.OptionMissingClosingQuoteCharacter, optionName, out errorText);
}
else
{
result = ProcessOption(optionName, textBldr.ToString(), out errorText);
}
break;
case ParseOptionState.ValuePossibleEndQuote:
result = ProcessOption(optionName, textBldr.ToString(), out errorText);
break;
}
break;
default:
Debug.Assert(false, "False");
break;
}
}
return(result);
}
