private static Token Accept(Token.TokenTypes type, List <Token> tokens, ref int idx)
{
if (idx < tokens.Count)
{
var tk = tokens[idx];
if (tk.Type == type)
{
idx++;
return(tk);
}
}
return(null);
}
private static Token Expect(Token.TokenTypes type, List <Token> tokens, ref int idx)
{
if (idx >= tokens.Count && idx > 0)
{
throw new ArgumentException(string.Format("Expected token {0} at line:{1}", type, tokens[idx - 1].Line));
}
var tk = tokens[idx];
if (tk.Type == type)
{
idx++;
return(tk);
}
throw new ArgumentException(string.Format("Unexpected token: '{0}' at line:{1}, expected {2}", tk.StringValue, tk.Line, type));
}
