public static ICommand Build(List <Token> tokens)
{
if (!tokens.Any(t => t.GetTokenType().Equals(TokenType.By)))
{
throw new SyntaxErrorException("ERROR! Order command do not contain definition of sorting variables.");
}
TokenType type = tokens[0].GetTokenType();
tokens.RemoveAt(0);
if (tokens.Count < 3)
{
throw new SyntaxErrorException("ERROR! Order command is too short.");
}
if (tokens.Where(t => t.GetTokenType().Equals(TokenType.By)).Count() > 1)
{
throw new SyntaxErrorException("ERROR! In order command keyword 'by' occurs too many times.");
}
if (!tokens[0].GetTokenType().Equals(TokenType.Variable))
{
throw new SyntaxErrorException("ERROR! Second word of order command must be name of list to order.");
}
if (!tokens[1].GetTokenType().Equals(TokenType.By))
{
throw new SyntaxErrorException("ERROR! In order command name of list contains spaces or other unallowed symbols.");
}
string name = tokens[0].GetContent();
if (!InterVariables.GetInstance().ContainsChangable(name, InterVarType.String) && InterVariables.GetInstance().ContainsChangable(name, InterVarType.List))
{
tokens.RemoveAt(0);
tokens.RemoveAt(0);
ISubcommand ord = SubcommandBuilder.Build(tokens, TokenType.OrderBy);
if (ord is OrderBy)
{
return(new Order(name, ord as OrderBy));
}
else
{
throw new SyntaxErrorException("ERROR! In order command there is something wrong with variables.");
}
}
else
{
throw new SyntaxErrorException("ERROR! In order command variable " + name + " do not exist, cannnot be read as list or cannot be modified.");
}
}
public void AddSubcommand(ISubcommand sub)
{
subcommands.Add(sub);
}
