/// <summary>
/// Read next token
/// </summary>
/// <returns>token</returns>
public Token NextToken()
{
var token = new Token();
var c = _reader.Read();
if (c == '\"')
{
var stringBuilder = new StringBuilder();
while (true)
{
c = _reader.Read();
if (c < 0)
break;
if (c == '\"')
break;
stringBuilder.Append((char) c);
}
token.Type = RtfTokenType.Text;
token.Key = stringBuilder.ToString();
return token;
}
while (c == '\r'
|| c == '\n'
|| c == '\t'
|| c == '\0')
c = _reader.Read();
if (c != Eof)
{
switch (c)
{
case '{':
token.Type = RtfTokenType.GroupStart;
break;
case '}':
token.Type = RtfTokenType.GroupEnd;
break;
case '\\':
ParseKeyword(token);
break;
default:
token.Type = RtfTokenType.Text;
ParseText(c, token);
break;
}
}
else
token.Type = RtfTokenType.Eof;
return token;
}
/// <summary>
/// Accept rtf token
/// </summary>
/// <param name="token">RTF token</param>
/// <param name="reader"></param>
/// <returns>Is accept it?</returns>
public bool Accept(Token token, Reader reader)
{
if (token == null)
return false;
if (token.Type == RtfTokenType.Text)
{
if (reader != null)
{
if (token.Key[0] == '?')
{
if (reader.LastToken != null)
{
if (reader.LastToken.Type == RtfTokenType.Keyword
&& reader.LastToken.Key == "u"
&& reader.LastToken.HasParam)
{
if (token.Key.Length > 0)
CheckBuffer();
return true;
}
}
}
}
CheckBuffer();
_stringBuilder.Append(token.Key);
return true;
}
if (token.Type == RtfTokenType.Control && token.Key == "'" && token.HasParam)
{
if (reader.CurrentLayerInfo.CheckUcValueCount())
_byteBuffer.Add((byte) token.Param);
return true;
}
if (token.Key == Consts.U && token.HasParam)
{
// Unicode char
CheckBuffer();
_stringBuilder.Append((char) token.Param);
reader.CurrentLayerInfo.UCValueCount = reader.CurrentLayerInfo.UcValue;
return true;
}
if (token.Key == Consts.Tab)
{
CheckBuffer();
_stringBuilder.Append("\t");
return true;
}
if (token.Key == Consts.Emdash)
{
CheckBuffer();
_stringBuilder.Append('-');
return true;
}
if (token.Key == "")
{
CheckBuffer();
_stringBuilder.Append('-');
return true;
}
return false;
}
/// <summary>
/// Read the following plain text in the current level
/// </summary>
/// <param name="reader">RTF reader</param>
/// <param name="firstToken"></param>
/// <param name="deeply">whether read the text in the sub level</param>
/// <param name="breakMeetControlWord"></param>
/// <param name="htmlMode"></param>
/// <returns>text</returns>
private string ReadInnerText(
Reader reader,
Token firstToken,
bool deeply,
bool breakMeetControlWord,
bool htmlMode)
{
var level = 0;
var container = new TextContainer(this);
container.Accept(firstToken, reader);
while (true)
{
var type = reader.PeekTokenType();
if (type == RtfTokenType.Eof)
break;
if (type == RtfTokenType.GroupStart)
level++;
else if (type == RtfTokenType.GroupEnd)
{
level--;
if (level < 0)
break;
}
reader.ReadToken();
if (deeply || level == 0)
{
if (htmlMode && reader.Keyword == Consts.Par)
{
container.Append(Environment.NewLine);
continue;
}
container.Accept(reader.CurrentToken, reader);
if (breakMeetControlWord)
break;
}
}
return container.Text;
}
/// <summary>
/// Parse text after char
/// </summary>
/// <param name="c"></param>
/// <param name="token"></param>
private void ParseText(int c, Token token)
{
var stringBuilder = new StringBuilder(((char) c).ToString(CultureInfo.InvariantCulture));
c = ClearWhiteSpace();
while (c != '\\' && c != '}' && c != '{' && c != Eof)
{
_reader.Read();
stringBuilder.Append((char) c);
c = ClearWhiteSpace();
}
token.Key = stringBuilder.ToString();
}
/// <summary>
/// Parse keyword from token
/// </summary>
/// <param name="token"></param>
private void ParseKeyword(Token token)
{
var ext = false;
var c = _reader.Peek();
if (!char.IsLetter((char) c))
{
_reader.Read();
if (c == '*')
{
// Expand keyword
token.Type = RtfTokenType.Keyword;
_reader.Read();
ext = true;
}
else
{
if (c == '\\' || c == '{' || c == '}')
{
// special character
token.Type = RtfTokenType.Text;
token.Key = ((char) c).ToString(CultureInfo.InvariantCulture);
}
else
{
token.Type = RtfTokenType.Control;
token.Key = ((char) c).ToString(CultureInfo.InvariantCulture);
if (token.Key == "\'")
{
// read 2 hex characters
var text = new StringBuilder();
text.Append((char) _reader.Read());
text.Append((char) _reader.Read());
token.HasParam = true;
token.Hex = text.ToString().ToLower();
token.Param = Convert.ToInt32(text.ToString().ToLower(), 16);
}
}
return;
}
}
// Read keyword
var keyword = new StringBuilder();
c = _reader.Peek();
while (char.IsLetter((char) c))
{
_reader.Read();
keyword.Append((char) c);
c = _reader.Peek();
}
token.Type = ext ? RtfTokenType.ExtKeyword : RtfTokenType.Keyword;
token.Key = keyword.ToString();
// Read an integer
if (char.IsDigit((char) c) || c == '-')
{
token.HasParam = true;
var negative = false;
if (c == '-')
{
negative = true;
_reader.Read();
}
c = _reader.Peek();
var text = new StringBuilder();
while (char.IsDigit((char) c))
{
_reader.Read();
text.Append((char) c);
c = _reader.Peek();
}
var param = Convert.ToInt32(text.ToString());
if (negative)
param = - param;
token.Param = param;
}
if (c == ' ')
_reader.Read();
}