Method stateInCommentLike

src/Tokenizer.ts:418–467

* Comments and CDATA end with `-->` and `]]>`. * * Their common qualities are: * - Their end sequences have a distinct character they start with. * - That character is then repeated, so we have to check multiple repeats. * - All characters but the start character of the sequ

(c: number)

     * @param c Current character code point.
     */
    private stateInCommentLike(c: number): void {
        if (
            !this.xmlMode &&
            this.currentSequence === Sequences.CommentEnd &&
            this.sequenceIndex <= 1 &&
            /*
             * We're still at the very start of the comment: the only
             * characters consumed since `<!--` are the dashes that
             * advanced sequenceIndex (0 for `<!-->`, 1 for `<!--->`).
             */
            this.index === this.sectionStart + this.sequenceIndex &&
            c === CharCodes.Gt
        ) {
            // Abruptly closed empty HTML comment.
            this.emitComment(this.sequenceIndex);
        } else if (
            this.currentSequence === Sequences.CommentEnd &&
            this.sequenceIndex === 2 &&
            c === CharCodes.Gt
        ) {
            // `!` is optional here, so the same sequence also accepts `-->`.
            this.emitComment(2);
        } else if (
            this.currentSequence === Sequences.CommentEnd &&
            this.sequenceIndex === this.currentSequence.length - 1 &&
            c !== CharCodes.Gt
        ) {
            this.sequenceIndex = Number(c === CharCodes.Dash);
        } else if (c === this.currentSequence[this.sequenceIndex]) {
            if (++this.sequenceIndex === this.currentSequence.length) {
                if (this.currentSequence === Sequences.CdataEnd) {
                    this.cbs.oncdata(this.sectionStart, this.index, 2);
                } else {
                    this.cbs.oncomment(this.sectionStart, this.index, 3);
                }

                this.sequenceIndex = 0;
                this.sectionStart = this.index + 1;
                this.state = State.Text;
            }
        } else if (this.sequenceIndex === 0) {
            // Fast-forward to the first character of the sequence
            if (this.fastForwardTo(this.currentSequence[0])) {
                this.sequenceIndex = 1;
            }
        } else if (c !== this.currentSequence[this.sequenceIndex - 1]) {
            // Allow long sequences, eg. --->, ]]]>
            this.sequenceIndex = 0;
        }
    }

    /**
     * HTML only allows ASCII alpha characters (a-z and A-Z) at the beginning of a tag name.