@marc-r2/micromark-extension-ofm-highlight/dist/lib/html.js

micromark extension to support OFM highlights

/**
 * Create an HTML extension for `micromark` to support OFM tags when
 * serializing to HTML.
 */
export function ofmHighlightHtml() {
    return {
        enter: {
            ofmHighlight() {
                this.tag('<mark class="highlight">');
            },
            ofmHighlightContent(token) {
                this.tag(this.encode(this.sliceSerialize(token)));
            },
            ofmHighlightMarker(token) {
                // Handle failed markers (single =) by including them in HTML output
                const markerText = this.sliceSerialize(token);
                if (markerText.length < 2) {
                    // This is a failed marker, include it as content
                    this.tag(this.encode(markerText));
                }
                // Valid markers (>=2 =) are handled by the tokenizer structure, not output as content
            },
        },
        exit: {
            ofmHighlight() {
                this.tag("</mark>");
            },
        },
    };
}