/// <summary>
/// The "token_list" is assumed to be x [ ... ].
/// </summary>
void parse_slice(TokenList token_list)
{
// counter for right bracket detection
int bracket_counter = 1; // number of left brackets so far
int start_index = 2;
for (int i = start_index; i < token_list.Count; i++)
{
// keep track of left brackets versus right brackets
if (token_list[i].type == TokenType.Left_Bracket)
{
bracket_counter++;
}
else if (token_list[i].type == TokenType.Right_Bracket)
{
bracket_counter--;
}
// a colon, or the bracket_counter hitting zero, indicates a function argument
if (token_list[i].type == TokenType.Colon || bracket_counter <= 0)
{
// The slice notation has at most 3 arguments: start, end, step
if (arguments.Count >= 3)
{
throw new Exception("The slice notation can have at most 3 arguments: start, end, and step.");
}
// add token_list[start_index, i-1] to the list of arguments
if (i - start_index >= 1)
{
arguments.add_argument(token_list, start_index, i - 1);
}
else
{
// Handle the case where a default is being used, like x[:2]
arguments.add_null_argument();
}
start_index = i + 1;
}
// bracket_counter hitting zero indicates end of the function
if (bracket_counter == 0)
{
break;
}
}
// The slice notation can have at most 3 arguments.
if (arguments.Count > 3)
{
throw new Exception("The slice notation can have at most 3 arguments.");
}
}