private static Token GetPairedToken(Token token)
{
if (token is Token.BeginBrace)
{
return(new Token.EndBrace(true));
}
if (token is Token.BeginQuote)
{
return(new Token.EndQuote());
}
if (token is Token.BeginRound)
{
return(new Token.EndRound());
}
if (token is Token.BeginSquare)
{
return(new Token.EndSquare());
}
if (token is Token.EndBrace)
{
return(new Token.BeginBrace(true));
}
if (token is Token.EndQuote)
{
return(new Token.BeginQuote());
}
if (token is Token.EndRound)
{
return(new Token.BeginRound());
}
if (token is Token.EndSquare)
{
return(new Token.BeginSquare());
}
Token.Keyword kwd = token as Token.Keyword;
if (kwd != null)
{
if (kwd.name == "if")
{
return(new Token.Keyword("else"));
}
if (kwd.name == "else")
{
return(new Token.Keyword("if"));
}
}
return(null);
}
public static bool IsOpenToken(Token token)
{
if (token is Token.BeginBrace)
{
return(true);
}
if (token is Token.BeginQuote)
{
return(true);
}
if (token is Token.BeginRound)
{
return(true);
}
if (token is Token.BeginSquare)
{
return(true);
}
if (token is Token.EndBrace)
{
return(false);
}
if (token is Token.EndQuote)
{
return(false);
}
if (token is Token.EndRound)
{
return(false);
}
if (token is Token.EndSquare)
{
return(false);
}
Token.Keyword kwd = token as Token.Keyword;
if (kwd != null)
{
if (kwd.name == "if")
{
return(true);
}
if (kwd.name == "else")
{
return(false);
}
}
throw new ArgumentException(string.Format("The token '{0}' not a brace!", token), "token");
}
/// <summary>
/// Return predicate function which check it argument is same token .
/// </summary>
private static Predicate <Token> GetMatchBracePredicate(Token token)
{
if (token is Token.BeginBrace)
{
return(t => t is Token.BeginBrace);
}
if (token is Token.BeginQuote)
{
return(t => t is Token.BeginQuote);
}
if (token is Token.BeginRound)
{
return(t => t is Token.BeginRound);
}
if (token is Token.BeginSquare)
{
return(t => t is Token.BeginSquare);
}
if (token is Token.EndBrace)
{
return(t => t is Token.EndBrace);
}
if (token is Token.EndQuote)
{
return(t => t is Token.EndQuote);
}
if (token is Token.EndRound)
{
return(t => t is Token.EndRound);
}
if (token is Token.EndSquare)
{
return(t => t is Token.EndSquare);
}
Token.Keyword kwd = token as Token.Keyword;
if (kwd != null)
{
if (kwd.name == "if")
{
return delegate(Token t)
{
Token.Keyword kwd1 = t as Token.Keyword;
return kwd1 != null && kwd1.name == "if";
}
}
;
if (kwd.name == "else")
{
return delegate(Token t)
{
Token.Keyword kwd1 = t as Token.Keyword;
return kwd1 != null && kwd1.name == "else";
}
}
;
}
return(null);
}
