private RtfToken ParseWord()
{
RtfToken token = new RtfToken();
Read(); // consume /
int c = Peek();
if (IsAsciiLetter(c))
{
token = ParseControlWord();
}
else if (c == '{' || c == '}' || c == '\\')
{
// escaped character
token.Type = RtfTokenType.Text;
token.Value = ((char)c).ToString();
Read(); // consume character
}
else
{
token.Type = RtfTokenType.ControlSymbol;
token.Value = ((char)c).ToString();
Read(); // consume symbol
}
return(token);
}
private RtfToken ParseText()
{
StringBuilder text = new StringBuilder();
text.Append((char)Read());
while (true)
{
while (IsInRange(IgnoredChars))
{
Read();
}
int c = Peek();
if (c == '{' || c == '}' || c == '\\' || c == EOF)
{
break;
}
text.Append((char)Read());
}
RtfToken token = new RtfToken();
token.Type = RtfTokenType.Text;
token.Value = text.ToString();
return(token);
}
private RtfToken Match(RtfTokenType type, string value)
{
RtfToken token = (RtfToken)Read();
if (token.Type != type || token.Value != value)
{
throw new ParseException("Unexpected token");
}
return(token);
}
private void ParseColorTable()
{
RtfToken token;
do
{
token = (RtfToken)Read();
if (token.Type == RtfTokenType.ControlWord && token.Value == "red")
{
RtfToken tokenG = Match(RtfTokenType.ControlWord, "green");
RtfToken tokenB = Match(RtfTokenType.ControlWord, "blue");
Match(RtfTokenType.Text, ";");
this.colorTable.Add(Color.FromArgb(0xff, (byte)token.Parameter, (byte)tokenG.Parameter, (byte)tokenB.Parameter));
}
}while (!token.IsEof && token.Type != RtfTokenType.GroupEnd);
}
/// <summary>
/// Gets the next token.
/// </summary>
/// <returns></returns>
public override IToken NextToken()
{
RtfToken token = new RtfToken();
while (IsInRange(IgnoredChars))
{
Read();
}
int c = Peek();
if (c == '{')
{
token.Type = RtfTokenType.GroupStart;
Read();
}
else if (c == '}')
{
token.Type = RtfTokenType.GroupEnd;
Read();
}
else if (c == '\\')
{
token = ParseWord();
}
else if (c == EOF)
{
token.Type = RtfTokenType.Eof;
}
else
{
token = ParseText();
}
return(token);
}
private RtfToken ParseControlWord()
{
StringBuilder word = new StringBuilder();
int? parameter = null;
bool negative = false;
int c;
while ((c = Peek()) != EOF)
{
if (c == ' ')
{
Read();
break;
}
if (this.State == RtfLexerState.ControlWordParameter)
{
if (IsDigit(c))
{
parameter = parameter * 10 + (c - '0');
}
else
{
break;
}
}
else
{
if (IsAsciiLetter(c))
{
word.Append((char)c);
}
else if (IsDigit(c))
{
PushState(RtfLexerState.ControlWordParameter);
parameter = c - '0';
}
else if (c == '-')
{
PushState(RtfLexerState.ControlWordParameter);
negative = true;
}
else
{
break;
}
}
Read();
}
if (this.State == RtfLexerState.ControlWordParameter)
{
PopState();
}
RtfToken token = new RtfToken();
token.Type = RtfTokenType.ControlWord;
token.Value = word.ToString();
if (parameter.HasValue)
{
token.Parameter = negative ? -parameter : parameter;
}
return(token);
}