/*
 * docCodeEnhancer.aus - Enhances doc page code blocks with CodeView.
 *
 * Strips HTML wrapper tags and entities, then replaces plain pre/code
 * blocks with syntax-highlighted CodeView blocks. Handles errors
 * gracefully so a failing code block does not break the whole page.
 */

class DocCodeEnhancer {
    /**
     * Enhances all pre/code blocks in the container with CodeView.
     * @p container is the DOM element containing the doc content.
     * @p productName is the product name string.
     */
    public enhance(container) {
        preElements = container.getByTagName('pre');
        preList = [];
        for (pre : preElements) {
            preList.add(pre);
        }

        for (pre : preList) {
            try {
                codeText = this.cleanCodeText(pre.getHtml());
                cv = new CodeView(null, false, false, false);
                rendered = cv.render(codeText);
                container.replaceChild(rendered, pre);
            } catch(err) {
                /* If highlighting fails, leave the original pre block */
                c.log('CodeView skipped block: ' + err);
            }
        }
    }

    /**
     * Strips <code> wrapper tags and decodes HTML entities.
     * @p rawHtml is the raw innerHTML from a pre element.
     * @r A clean code string ready for the Highlighter.
     */
    public cleanCodeText(string rawHtml) {
        /* Strip <code> and </code> wrapper tags */
        text = rawHtml.replace('<code>', '');
        text = text.replace('</code>', '');

        /* Also handle <code class="..."> variants */
        idx = text.indexOf('<code ');
        while (idx >= 0) {
            endIdx = text.indexOfStart('>', idx);
            if (endIdx >= 0) {
                tag = text.substr(idx, endIdx + 1);
                text = text.replace(tag, '');
            }
            idx = text.indexOf('<code ');
        }

        /* Decode HTML entities */
        text = text.replace('&amp;', '&');
        text = text.replace('&lt;', '<');
        text = text.replace('&gt;', '>');
        text = text.replace('&quot;', '"');
        text = text.replace('&#39;', "'");

        return text;
    }

}