public scanComments()

in src/scanner.ts [243:309]
62 lines of code
21 McCabe index (conditional complexity)

    public scanComments() {
        let comments;
        if (this.trackComment) {
            comments = [];
        }

        let start = (this.index === 0);
        while (!this.eof()) {
            let ch = this.source.charCodeAt(this.index);

            if (Character.isWhiteSpace(ch)) {
                ++this.index;
            } else if (Character.isLineTerminator(ch)) {
                ++this.index;
                if (ch === 0x0D && this.source.charCodeAt(this.index) === 0x0A) {
                    ++this.index;
                }
                ++this.lineNumber;
                this.lineStart = this.index;
                start = true;
            } else if (ch === 0x2F) { // U+002F is '/'
                ch = this.source.charCodeAt(this.index + 1);
                if (ch === 0x2F) {
                    this.index += 2;
                    const comment = this.skipSingleLineComment(2);
                    if (this.trackComment) {
                        comments = comments.concat(comment);
                    }
                    start = true;
                } else if (ch === 0x2A) {  // U+002A is '*'
                    this.index += 2;
                    const comment = this.skipMultiLineComment();
                    if (this.trackComment) {
                        comments = comments.concat(comment);
                    }
                } else {
                    break;
                }
            } else if (start && ch === 0x2D) { // U+002D is '-'
                // U+003E is '>'
                if ((this.source.charCodeAt(this.index + 1) === 0x2D) && (this.source.charCodeAt(this.index + 2) === 0x3E)) {
                    // '-->' is a single-line comment
                    this.index += 3;
                    const comment = this.skipSingleLineComment(3);
                    if (this.trackComment) {
                        comments = comments.concat(comment);
                    }
                } else {
                    break;
                }
            } else if (ch === 0x3C && !this.isModule) { // U+003C is '<'
                if (this.source.slice(this.index + 1, this.index + 4) === '!--') {
                    this.index += 4; // `<!--`
                    const comment = this.skipSingleLineComment(4);
                    if (this.trackComment) {
                        comments = comments.concat(comment);
                    }
                } else {
                    break;
                }
            } else {
                break;
            }
        }

        return comments;
    }