public static ICommand Build(List <Token> tokens)
{
tokens.RemoveAt(0);
if (tokens.Count() > 3)
{
throw new SyntaxErrorException("ERROR! Command 'swap' is too long.");
}
if (tokens.Count() < 3)
{
throw new SyntaxErrorException("ERROR! Command 'swap' do not contain all necessary information.");
}
if (!tokens[1].GetTokenType().Equals(TokenType.With) && !tokens[1].GetTokenType().Equals(TokenType.And))
{
throw new SyntaxErrorException("ERROR! Command 'swap' do not have variables separated by keyword 'with' or 'and'.");
}
if (!tokens[0].GetTokenType().Equals(TokenType.Variable))
{
throw new SyntaxErrorException("ERROR! Command 'swap' do not have name of first variable to swap.");
}
if (!tokens[2].GetTokenType().Equals(TokenType.Variable))
{
throw new SyntaxErrorException("ERROR! Command 'swap' do not have name of second variable to swap.");
}
string leftVariable = tokens[2].GetContent();
string rightVariable = tokens[0].GetContent();
if (!InterVariables.GetInstance().Contains(leftVariable))
{
throw new SyntaxErrorException("ERROR! In command 'swap' variable " + leftVariable + " do not exist.");
}
if (!InterVariables.GetInstance().Contains(rightVariable))
{
throw new SyntaxErrorException("ERROR! In command 'swap' variable " + rightVariable + " do not exist.");
}
InterVarType leftType = InterVariables.GetInstance().GetVarType(leftVariable);
InterVarType rightType = InterVariables.GetInstance().GetVarType(rightVariable);
if (!leftType.Equals(rightType))
{
throw new SyntaxErrorException("ERROR! Variables " + leftVariable + " and " + rightVariable + " cannot be swapped, because they are of different type.");
}
return(new Swap(leftVariable, rightVariable));
}
public bool IsBool()
{
if (type.Equals(InterVarType.Bool))
{
return(true);
}
else
{
return(false);
}
}