private void ProcessToken(ref Token token, TokenKind kind, Func<string, int, bool> validator)
{
do
{
++m_CurrentPosition;
} while (!IsEoF && validator(m_Source, m_CurrentPosition));
token.Kind = kind;
token.TokenEnd = m_CurrentPosition;
}
public Token NextToken()
{
Token result = new Token();
result.TokenStart = m_CurrentPosition;
if (IsEoF)
{
result.TokenEnd = m_CurrentPosition;
result.Kind = TokenKind.EoF;
}
else if (m_Source[m_CurrentPosition] == '<')
{
ProcessToken(ref result, TokenKind.Html, (s, o) => s[o - 1] != '>');
}
else if (char.IsWhiteSpace(m_Source, m_CurrentPosition))
{
ProcessToken(ref result, TokenKind.Whitespace, char.IsWhiteSpace);
}
else if (char.IsDigit(m_Source, m_CurrentPosition))
{
ProcessToken(ref result, TokenKind.Number | TokenKind.Word, (s, o) => char.IsDigit(s, o) || s[o] == '.' || s[o] == ',');
}
else if (char.IsPunctuation(m_Source, m_CurrentPosition))
{
ProcessToken(ref result, TokenKind.Punctuation, char.IsPunctuation);
}
else if (char.IsLetter(m_Source, m_CurrentPosition))
{
ProcessToken(ref result, TokenKind.Word, char.IsLetter);
}
else
{
++m_CurrentPosition;
result.TokenEnd = m_CurrentPosition;
result.Kind = TokenKind.Unknown;
}
result.Content = m_Source.Substring(result.TokenStart, result.TokenLength);
return result;
}