socialite.brannanatkinson.com

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name : renderer.js
 const FontStyle = {
    NotSet: -1,
    None: 0,
    Italic: 1,
    Bold: 2,
    Underline: 4
}

const FONT_STYLE_TO_CSS = {
    [FontStyle.Italic]: 'font-style: italic',
    [FontStyle.Bold]: 'font-weight: bold',
    [FontStyle.Underline]: 'text-decoration: underline'
}

const renderToHtml = function(lines, options = {}) {
    const bg = options.bg || '#fff'
    const highlightedLines = makeHighlightSet(options.highlightLines);
    const addLines = makeHighlightSet(options.addLines);
    const deleteLines = makeHighlightSet(options.deleteLines);
    const focusLines = makeHighlightSet(options.focusLines);

    let className = 'shiki';

    if (highlightedLines.size) {
        className += ' highlighted'
    }
    if (addLines.size) {
        className += ' added'
    }
    if (deleteLines.size) {
        className += ' deleted'
    }
    if (focusLines.size) {
        className += ' focus'
    }

    let html = ''

    html += `<pre class="${className}" style="background-color: ${bg}">`
    if (options.langId) {
        html += `<div class="language-id">${options.langId}</div>`
    }
    html += `<code>`

    lines.forEach((l, index) => {
        const lineNumber = index + 1;

        let lineClass = 'line'
        if (highlightedLines.has(lineNumber)) {
            lineClass += ' highlight'
        }
        if (addLines.has(lineNumber)) {
            lineClass += ' add'
        }
        if (deleteLines.has(lineNumber)) {
            lineClass += ' del'
        }
        if (focusLines.has(lineNumber)) {
            lineClass += ' focus'
        }

        html += `<span class="${lineClass.trim()}">`

        l.forEach(token => {
            const cssDeclarations = [`color: ${token.color || options.fg}`]
            if (token.fontStyle > FontStyle.None) {
                cssDeclarations.push(FONT_STYLE_TO_CSS[token.fontStyle])
            }
            html += `<span style="${cssDeclarations.join('; ')}">${escapeHtml(token.content)}</span>`
        })
        html += `</span>\n`
    })
    html = html.replace(/\n*$/, '') // Get rid of final new lines
    html += `</code></pre>`

    return html
}

const makeHighlightSet = function(highlightLines) {
    const lines = new Set();

    if (! highlightLines) {
        return lines;
    }

    for (let lineSpec of highlightLines) {
        if (lineSpec.toString().includes('-')) {
            const [begin, end] = lineSpec.split('-').map(lineNo => Number(lineNo))
            for (let line = begin; line <= end; line++) {
                lines.add(line);
            }
        } else if (lineSpec.toString().trim()) {
            lines.add(Number(lineSpec));
        }
    }

    return lines
}

const htmlEscapes = {
    '&': '&amp;',
    '<': '&lt;',
    '>': '&gt;',
    '"': '&quot;',
    "'": '&#39;'
}

function escapeHtml(html) {
    return html.replace(/[&<>"']/g, chr => htmlEscapes[chr])
}

exports.renderToHtml = renderToHtml;
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