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26 lines
609 B
Go
26 lines
609 B
Go
package rulesfn
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// Substring returns the substring of the input provided. If the start or stop
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// indexes are not valid for the input nil will be returned. If errors occur
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// they will be added to the provided [ErrorCollector].
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func SubString(input string, start, stop int, reverse bool) *string {
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if start < 0 || stop < 1 || start >= stop || len(input) < stop {
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return nil
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}
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for _, r := range input {
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if r > 127 {
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return nil
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}
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}
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if !reverse {
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v := input[start:stop]
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return &v
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}
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rStart := len(input) - stop
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rStop := len(input) - start
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return SubString(input, rStart, rStop, false)
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}
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