kubernetes/vendor/github.com/google/cel-go/parser/unescape.go

// Unescape takes a quoted string, unquotes, and unescapes it.
//
// This function performs escaping compatible with GoogleSQL.
func unescape(value string, isBytes bool) (string, error) { … }

// unescapeChar takes a string input and returns the following info:
//
//   value - the escaped unicode rune at the front of the string.
//   encode - the value should be unicode-encoded
//   tail - the remainder of the input string.
//   err - error value, if the character could not be unescaped.
//
// When encode is true the return value may still fit within a single byte,
// but unicode encoding is attempted which is more expensive than when the
// value is known to self-represent as a single byte.
//
// If isBytes is set, unescape as a bytes literal so octal and hex escapes
// represent byte values, not unicode code points.
func unescapeChar(s string, isBytes bool) (value rune, encode bool, tail string, err error) { … }

func unhex(b byte) (rune, bool) { … }

var newlineNormalizer …