public Node Parse(string text)
{
text = text.Replace("\r\n", "").Replace("\r", "").Replace("\n", "");
_lexer = new Lexer(text);
_currentToken = _lexer.Next();
_nextToken = _lexer.Next();
Node node = new Node(TokenType.StartOfFile);
return Template(node);
}
public Lexer(string text)
{
Tokens = new List<Token>();
TokenType tokenType = TokenType.Text;
Token currentToken = null;
for (int i = 0; i < text.Length; ++i)
{
char c = text[i];
char n = i + 1 < text.Length ? text[i + 1] : (char)0;
switch (c)
{
case '$':
tokenType = AddToken(TokenType.Dollar, TokenType.Text, ref currentToken);
break;
case '|':
tokenType = AddToken(TokenType.Pipe, TokenType.Value, ref currentToken);
break;
case '{':
tokenType = AddToken(TokenType.OpenCurly, TokenType.Identifier, ref currentToken);
break;
case '}':
tokenType = AddToken(TokenType.CloseCurly, TokenType.Text, ref currentToken);
break;
case '?':
tokenType = AddToken(TokenType.Question, TokenType.Text, ref currentToken);
break;
case ':':
tokenType = AddToken(TokenType.Colon, TokenType.Text, ref currentToken);
break;
case '=':
tokenType = AddToken(TokenType.EqualTo, TokenType.Value, ref currentToken);
break;
case '!':
if (n == '=')
{
i++;
tokenType = AddToken(TokenType.NotEqualTo, TokenType.Value, ref currentToken);
}
else
{
throw new Exception("= Expected");
}
break;
default:
if (currentToken == null)
{
currentToken = new Token(tokenType, c.ToString());
Tokens.Add(currentToken);
}
else if (currentToken.TokenType == TokenType.Text)
{
currentToken.Text += c;
}
else if (currentToken.TokenType == TokenType.Identifier
|| currentToken.TokenType == TokenType.Value)
{
if (c != ' ' && !Char.IsLetter(c) && !Char.IsNumber(c))
{
throw new Exception("Invalid char in Identifier");
}
currentToken.Text += c;
}
break;
}
}
TrimIdentifierAndValues(currentToken);
Tokens.Add(new Token(TokenType.EndOfFile));
}
private TokenType AddToken(TokenType tokenType, TokenType nextTokenType, ref Token token)
{
Tokens.Add(new Token(tokenType));
TrimIdentifierAndValues(token);
token = null;
return nextTokenType;
}
private static void TrimIdentifierAndValues(Token token)
{
if (token != null
&& (token.TokenType == TokenType.Identifier
|| token.TokenType == TokenType.Value))
{
token.Text = token.Text.Trim();
}
}
private void Next()
{
_currentToken = _nextToken;
_nextToken = _lexer.Next();
}
