private getComplexIdentifier()

in src/scanner.ts [451:505]
49 lines of code
15 McCabe index (conditional complexity)

    private getComplexIdentifier(): string {
        let cp = this.codePointAt(this.index);
        let id = Character.fromCodePoint(cp);
        this.index += id.length;

        // '\u' (U+005C, U+0075) denotes an escaped character.
        let ch;
        if (cp === 0x5C) {
            if (this.source.charCodeAt(this.index) !== 0x75) {
                this.throwUnexpectedToken();
            }
            ++this.index;
            if (this.source[this.index] === '{') {
                ++this.index;
                ch = this.scanUnicodeCodePointEscape();
            } else {
                ch = this.scanHexEscape('u');
                if (ch === null || ch === '\\' || !Character.isIdentifierStart(ch.charCodeAt(0))) {
                    this.throwUnexpectedToken();
                }
            }
            id = ch;
        }

        while (!this.eof()) {
            cp = this.codePointAt(this.index);
            if (!Character.isIdentifierPart(cp)) {
                break;
            }
            ch = Character.fromCodePoint(cp);
            id += ch;
            this.index += ch.length;

            // '\u' (U+005C, U+0075) denotes an escaped character.
            if (cp === 0x5C) {
                id = id.substr(0, id.length - 1);
                if (this.source.charCodeAt(this.index) !== 0x75) {
                    this.throwUnexpectedToken();
                }
                ++this.index;
                if (this.source[this.index] === '{') {
                    ++this.index;
                    ch = this.scanUnicodeCodePointEscape();
                } else {
                    ch = this.scanHexEscape('u');
                    if (ch === null || ch === '\\' || !Character.isIdentifierPart(ch.charCodeAt(0))) {
                        this.throwUnexpectedToken();
                    }
                }
                id += ch;
            }
        }

        return id;
    }