/// <summary>
/// Reads the next character off of the input stream and advances the current position.
/// </summary>
/// <returns></returns>
public SourceChar Read()
{
var sourceChar = this.Peek();
switch (sourceChar.Value)
{
case '\r':
this.LineNumber += 1;
this.ColumnNumber = 1;
break;
case '\n':
var lastChar = this.LastChar;
if ((lastChar != null) && (lastChar.Value == '\r'))
{
sourceChar = new SourceChar(sourceChar.Value, this.Position, lastChar.LineNumber, lastChar.ColumnNumber + 1);
}
else
{
this.LineNumber += 1;
this.ColumnNumber = 1;
}
break;
default:
this.ColumnNumber += 1;
break;
}
this.Position += 1;
this.LastChar = sourceChar;
return(sourceChar);
}
internal UnexpectedCharacterException(SourceChar foundChar)
{
if (foundChar == null)
{
throw new ArgumentNullException("foundChar");
}
this.FoundChar = foundChar;
}
/// <summary>
/// BUGBUG - doesn't handle escapedUCSchar
/// </summary>
public void ConsumeChar(SourceChar @char)
{
if (this.IsEscaped)
{
if (_escapeMap.ContainsKey(@char.Value))
{
this.OutputString.Append(_escapeMap[@char.Value]);
this.IsEscaped = false;
}
else
{
throw new UnexpectedCharacterException(@char);
}
}
else if (@char.Value == StringValidator.Backslash)
{
this.IsEscaped = true;
}
else
{
this.OutputString.Append(@char.Value);
}
}
internal SourceExtent WithEndExtent(SourceChar sourceChar)
{
return(new SourceExtent(this.StartPosition, this.StartLineNumber, this.StartColumnNumber, sourceChar.Position, sourceChar.LineNumber, sourceChar.ColumnNumber, this.Text));
}
internal SourceExtent WithStartExtent(SourceChar sourceChar)
{
return(new SourceExtent(sourceChar.Position, sourceChar.LineNumber, sourceChar.ColumnNumber, this.EndPosition, this.EndLineNumber, this.EndColumnNumber, this.Text));
}