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strings.go (609B)

      1 package rulesfn
      2 
      3 // Substring returns the substring of the input provided. If the start or stop
      4 // indexes are not valid for the input nil will be returned. If errors occur
      5 // they will be added to the provided [ErrorCollector].
      6 func SubString(input string, start, stop int, reverse bool) *string {
      7 	if start < 0 || stop < 1 || start >= stop || len(input) < stop {
      8 		return nil
      9 	}
     10 
     11 	for _, r := range input {
     12 		if r > 127 {
     13 			return nil
     14 		}
     15 	}
     16 
     17 	if !reverse {
     18 		v := input[start:stop]
     19 		return &v
     20 	}
     21 
     22 	rStart := len(input) - stop
     23 	rStop := len(input) - start
     24 	return SubString(input, rStart, rStop, false)
     25 }