Function decodeUnicodeEscape

escape.go:63–84

(in []byte)

}

func decodeUnicodeEscape(in []byte) (rune, int) {
	if r, ok := decodeSingleUnicodeEscape(in); !ok {
		// Invalid Unicode escape
		return utf8.RuneError, -1
	} else if !isUTF16EncodedRune(r) {
		// Valid Unicode escape in Basic Multilingual Plane.
		// Note: a single \uXXXX escape produces r in [0, 0xFFFF], so r is always
		// within the BMP. The former r <= basicMultilingualPlaneOffset guard was
		// tautological and has been removed — the real discriminator is whether r
		// falls in the UTF-16 surrogate range.
		return r, 6
	} else if r2, ok := decodeSingleUnicodeEscape(in[6:]); !ok { // Note: previous decodeSingleUnicodeEscape success guarantees at least 6 bytes remain
		// UTF16 "high surrogate" without manditory valid following Unicode escape for the "low surrogate"
		return utf8.RuneError, -1
	} else if r2 < lowSurrogateOffset {
		// Invalid UTF16 "low surrogate"
		return utf8.RuneError, -1
	} else {
		// Valid UTF16 surrogate pair
		return combineUTF16Surrogates(r, r2), 12
	}
}

// backslashCharEscapeTable: when '\X' is found for some byte X, it is to be replaced with backslashCharEscapeTable[X]
var backslashCharEscapeTable = [...]byte{