Function scanEscapeSequence

test/fixtures/snapshot/typescript.js:11148–11248

(isTaggedTemplate)

            return resultingToken;
        }
        function scanEscapeSequence(isTaggedTemplate) {
            var start = pos;
            pos++;
            if (pos >= end) {
                error(ts.Diagnostics.Unexpected_end_of_text);
                return "";
            }
            var ch = text.charCodeAt(pos);
            pos++;
            switch (ch) {
                case 48 /* CharacterCodes._0 */:
                    // '\01'
                    if (isTaggedTemplate && pos < end && isDigit(text.charCodeAt(pos))) {
                        pos++;
                        tokenFlags |= 2048 /* TokenFlags.ContainsInvalidEscape */;
                        return text.substring(start, pos);
                    }
                    return "\0";
                case 98 /* CharacterCodes.b */:
                    return "\b";
                case 116 /* CharacterCodes.t */:
                    return "\t";
                case 110 /* CharacterCodes.n */:
                    return "\n";
                case 118 /* CharacterCodes.v */:
                    return "\v";
                case 102 /* CharacterCodes.f */:
                    return "\f";
                case 114 /* CharacterCodes.r */:
                    return "\r";
                case 39 /* CharacterCodes.singleQuote */:
                    return "\'";
                case 34 /* CharacterCodes.doubleQuote */:
                    return "\"";
                case 117 /* CharacterCodes.u */:
                    if (isTaggedTemplate) {
                        // '\u' or '\u0' or '\u00' or '\u000'
                        for (var escapePos = pos; escapePos < pos + 4; escapePos++) {
                            if (escapePos < end && !isHexDigit(text.charCodeAt(escapePos)) && text.charCodeAt(escapePos) !== 123 /* CharacterCodes.openBrace */) {
                                pos = escapePos;
                                tokenFlags |= 2048 /* TokenFlags.ContainsInvalidEscape */;
                                return text.substring(start, pos);
                            }
                        }
                    }
                    // '\u{DDDDDDDD}'
                    if (pos < end && text.charCodeAt(pos) === 123 /* CharacterCodes.openBrace */) {
                        pos++;
                        // '\u{'
                        if (isTaggedTemplate && !isHexDigit(text.charCodeAt(pos))) {
                            tokenFlags |= 2048 /* TokenFlags.ContainsInvalidEscape */;
                            return text.substring(start, pos);
                        }
                        if (isTaggedTemplate) {
                            var savePos = pos;
                            var escapedValueString = scanMinimumNumberOfHexDigits(1, /*canHaveSeparators*/ false);
                            var escapedValue = escapedValueString ? parseInt(escapedValueString, 16) : -1;
                            // '\u{Not Code Point' or '\u{CodePoint'