Function Parse

postgres/parser/utils/bitarray.go:337–371

Parse parses a bit array from the specified string.

(s string)

// Parse parses a bit array from the specified string.
func Parse(s string) (res BitArray, err error) {
	if len(s) == 0 {
		return res, nil
	}

	words, lastBitsUsed := EncodingPartsForBitLen(uint(len(s)))

	// Parse the bits.
	wordIdx := 0
	bitIdx := uint(0)
	curWord := word(0)
	for _, c := range s {
		val := word(c - '0')
		bitVal := val & 1
		if bitVal != val {
			// Note: the prefix "could not parse" is important as it is used
			// to detect parsing errors in tests.
			err := fmt.Errorf(`could not parse string as bit array: "%c" is not a valid binary digit`, c)
			return res, pgerror.WithCandidateCode(err, pgcode.InvalidTextRepresentation)
		}
		curWord |= bitVal << (63 - bitIdx)
		bitIdx = (bitIdx + 1) % numBitsPerWord
		if bitIdx == 0 {
			words[wordIdx] = curWord
			curWord = 0
			wordIdx++
		}
	}
	if bitIdx > 0 {
		// Ensure the last word is stored.
		words[wordIdx] = curWord
	}

	return FromEncodingParts(words, lastBitsUsed)
}

// Concat concatenates two bit arrays.
func Concat(lhs, rhs BitArray) BitArray {