379 lines
17 KiB
JavaScript
379 lines
17 KiB
JavaScript
function escapeHtml(value) {
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return String(value).replace(/[&<>"']/g, c => ({"&":"&","<":"<",">":">",'"':""","'":"'"}[c]));
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}
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function safeUrl(value) {
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const url = String(value).trim();
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if (/^(https?:\/\/|mailto:|\/|\.\/|\.\.\/|#)/i.test(url)) return escapeHtml(url);
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return "#";
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}
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const emoji = {
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smile:"😄", joy:"😂", heart:"❤️", thumbs_up:"👍", thumbsup:"👍", thumbs_down:"👎",
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fire:"🔥", rocket:"🚀", tada:"🎉", warning:"⚠️", white_check_mark:"✅", x:"❌",
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eyes:"👀", bulb:"💡", memo:"📝", pushpin:"📌", bug:"🐛", sparkles:"✨",
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thinking:"🤔", clap:"👏", ok_hand:"👌", pray:"🙏", muscle:"💪", coffee:"☕",
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tent:"⛺", star:"⭐", checkered_flag:"🏁"
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};
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function inline(value) {
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const tokens = [];
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const stash = html => {
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const token = `\u0000T${tokens.length}\u0000`;
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tokens.push(html);
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return token;
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};
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let html = escapeHtml(value);
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html = html.replace(/`([^`]+)`/g, (_, code) => stash(`<code>${code}</code>`));
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html = html.replace(/!\[([^\]]*)\]\(([^\s)]+)(?:\s+["']([^"']*)["'])?\)/g, (_, alt, url, title) => {
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const titleAttr = title ? ` title="${escapeHtml(title)}"` : "";
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return stash(`<img src="${safeUrl(url)}" alt="${alt}" loading="lazy" decoding="async" draggable="false" contenteditable="false"${titleAttr}>`);
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});
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html = html.replace(/\[([^\]]+)\]\(([^\s)]+)(?:\s+["']([^"']*)["'])?\)/g, (_, label, url, title) => {
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const titleAttr = title ? ` title="${escapeHtml(title)}"` : "";
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return stash(`<a href="${safeUrl(url)}" target="_blank" rel="noopener noreferrer"${titleAttr}>${label}</a>`);
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});
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html = html.replace(/\[\^([^\]\s]+)\]/g, (_, id) => stash(`<sup class="footnote-ref"><a href="#fn-${escapeHtml(id)}" id="fnref-${escapeHtml(id)}">?</a></sup>`));
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html = html
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.replace(/\*\*([^*]+)\*\*/g, "<strong>$1</strong>")
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.replace(/~~([^~]+)~~/g, "<s>$1</s>")
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.replace(/==([^=]+)==/g, "<mark>$1</mark>")
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.replace(/\*([^*]+)\*/g, "<em>$1</em>")
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.replace(/(?<!~)~([^~\n]+)~(?!~)/g, "<sub>$1</sub>")
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.replace(/\^([^^\n]+)\^/g, "<sup>$1</sup>")
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.replace(/:([a-z0-9_+-]+):/gi, (match, name) => emoji[name] || match);
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html = html.replace(/(^|[\s(])((?:https?:\/\/|mailto:)[^\s<]+)/gi, (match, prefix, url) => {
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const clean = url.replace(/[.,!?;:]+$/, "");
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const suffix = url.slice(clean.length);
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return `${prefix}${stash(`<a href="${safeUrl(clean)}" target="_blank" rel="noopener noreferrer">${clean}</a>`)}${suffix}`;
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});
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return html.replace(/\u0000T(\d+)\u0000/g, (_, index) => tokens[Number(index)] || "");
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}
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const languageAliases = {
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js: "javascript", javascript: "javascript", jsx: "javascript",
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ts: "typescript", typescript: "typescript", tsx: "typescript",
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py: "python", python: "python",
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rb: "ruby", ruby: "ruby",
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rs: "rust", rust: "rust",
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php: "php",
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sh: "bash", shell: "bash", bash: "bash", zsh: "bash",
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c: "c", h: "c",
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cpp: "cpp", "c++": "cpp", cxx: "cpp", hpp: "cpp",
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cs: "csharp", "c#": "csharp", csharp: "csharp",
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java: "java", kotlin: "kotlin", kt: "kotlin",
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go: "go", golang: "go",
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swift: "swift", dart: "dart", scala: "scala",
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html: "html", htm: "html", xml: "xml", svg: "xml",
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css: "css", scss: "scss", sass: "scss", less: "less",
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json: "json", jsonc: "json", yaml: "yaml", yml: "yaml", toml: "ini", ini: "ini",
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sql: "sql", graphql: "graphql", gql: "graphql",
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md: "markdown", markdown: "markdown",
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dockerfile: "dockerfile", docker: "dockerfile",
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makefile: "makefile", make: "makefile",
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powershell: "powershell", ps1: "powershell",
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lua: "lua", perl: "perl", pl: "perl", r: "r", matlab: "matlab",
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nginx: "nginx", apache: "apache", diff: "diff", patch: "diff",
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text: "plaintext", txt: "plaintext", plaintext: "plaintext", none: "plaintext",
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mermaid: "mermaid"
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};
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function normalizeLanguage(value) {
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const language = String(value || "").trim().toLowerCase();
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if (!language) return "";
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return languageAliases[language] || language.replace(/[^a-z0-9_-]/g, "");
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}
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const attrs = (line, editable = false, prefix = "", suffix = "", lineOffset = 0) => ` class="preview-source-line${editable ? " preview-editable" : ""}" data-source-line="${line + lineOffset + 1}"${editable ? ` contenteditable="true" spellcheck="true" data-source-prefix="${escapeHtml(prefix)}" data-source-suffix="${escapeHtml(suffix)}"` : ""}`;
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const isPlainText = line => !/[`*_~^=\[\]<>|:#]/.test(line) && !/^\s*(?:[-+*>]|\d+\.)\s/.test(line);
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function listLine(line) {
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const match = line.match(/^(\s*)([-*+]|(\d+)\.)\s+(?:\[([ xX])\]\s+)?(.+)$/);
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if (!match) return null;
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const indent = match[1].replace(/\t/g, " ").length;
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return {
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indent,
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whitespace: match[1],
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type: match[3] ? "ol" : "ul",
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number: match[3] ? Number(match[3]) : null,
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checked: match[4] == null ? null : match[4].toLowerCase() === "x",
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text: match[5],
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marker: match[3] ? `${match[3]}. ` : `${match[2]} `
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};
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}
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function renderList(lines, start, lineOffset = 0, baseIndent = null, forcedType = null, depth = 0) {
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const first = listLine(lines[start]);
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if (!first) return null;
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const indent = baseIndent == null ? first.indent : baseIndent;
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const type = forcedType || first.type;
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let index = start;
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let body = "";
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let hasTask = false;
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while (index < lines.length) {
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const item = listLine(lines[index]);
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if (!item || item.indent < indent || item.indent !== indent || item.type !== type) break;
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const sourceLine = index + lineOffset + 1;
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const prefix = `${item.whitespace}${item.marker}${item.checked == null ? "" : `[${item.checked ? "x" : " "}] `}`;
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const valueAttr = "";
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const taskClass = item.checked == null ? "" : " task-list-item";
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hasTask ||= item.checked != null;
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const gutterOffset = `${(depth + 1) * 1.75}em`;
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body += `<li class="preview-source-line list-source-line${taskClass}" data-source-line="${sourceLine}"${valueAttr} style="--list-gutter-offset:${gutterOffset}">`;
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if (item.checked != null) {
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body += `<input type="checkbox" class="task-checkbox" data-source-line="${sourceLine}"${item.checked ? " checked" : ""}>`;
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}
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body += `<span class="preview-editable list-item-content" contenteditable="true" spellcheck="true" data-source-line="${sourceLine}" data-source-prefix="${escapeHtml(prefix)}">${inline(item.text)}</span>`;
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index++;
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while (index < lines.length) {
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const nested = listLine(lines[index]);
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if (!nested || nested.indent <= indent) break;
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const rendered = renderList(lines, index, lineOffset, nested.indent, nested.type, depth + 1);
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if (!rendered) break;
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body += rendered.html;
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index = rendered.end;
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}
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body += `</li>`;
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}
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const classAttr = hasTask ? ` class="contains-task-items"` : "";
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return {html: `<${type}${classAttr}>${body}</${type}>`, end: index};
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}
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function splitTableRow(line) {
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let value = line.trim();
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if (value.startsWith("|")) value = value.slice(1);
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if (value.endsWith("|")) value = value.slice(0, -1);
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return value.split("|").map(cell => cell.trim().replace(/|/g, "|"));
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}
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function tableDelimiter(line) {
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const cells = splitTableRow(line);
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if (!cells.length || !cells.every(cell => /^:?-{3,}:?$/.test(cell))) return null;
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return cells.map(cell => cell.startsWith(":") && cell.endsWith(":") ? "center" : cell.endsWith(":") ? "right" : "left");
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}
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function headingSlug(value) {
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return String(value)
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.replace(/\{#[A-Za-z][\w:.-]*\}\s*$/, "")
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.replace(/[`*_~^=<>]/g, "")
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.replace(/:([a-z0-9_+-]+):/gi, "$1")
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.toLowerCase().trim()
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.replace(/[^a-z0-9\u00c0-\u024f\u1e00-\u1eff]+/g, "-")
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.replace(/^-+|-+$/g, "") || "section";
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}
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function collectHeadings(lines) {
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const used = new Map();
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const headings = [];
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let fence = null;
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lines.forEach((line, index) => {
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const fenceMatch = line.match(/^\s*(```+|~~~+)/);
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if (fenceMatch) {
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if (!fence) fence = fenceMatch[1];
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else if (fenceMatch[1][0] === fence[0] && fenceMatch[1].length >= fence.length) fence = null;
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return;
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}
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if (fence) return;
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const match = line.match(/^\s{0,4}(#{1,6})\s+(.+?)(?:\s+\{#([A-Za-z][\w:.-]*)\})?\s*$/);
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if (!match) return;
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const base = match[3] || headingSlug(match[2]);
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const count = used.get(base) || 0;
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used.set(base, count + 1);
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const id = count ? `${base}-${count + 1}` : base;
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headings.push({level: match[1].length, text: match[2], id, index});
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});
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return headings;
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}
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export function alignPreviewLineNumbers(root) {
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if (!root) return;
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const styles = getComputedStyle(root);
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const targetLeft = parseFloat(styles.paddingLeft || "0") - 50;
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const rootLeft = root.getBoundingClientRect().left;
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root.querySelectorAll(".preview-source-line").forEach(line => {
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const lineLeft = line.getBoundingClientRect().left - rootLeft;
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line.style.setProperty("--preview-line-left", `${targetLeft - lineLeft}px`);
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});
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}
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export function renderMarkdown(source, lineOffset = 0) {
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let html = "", inCode = false, fence = "", language = "", codeLineStart = null, code = [], codeStart = 0;
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const lines = String(source).split("\n");
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const headings = collectHeadings(lines);
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const headingByLine = new Map(headings.map(item => [item.index, item]));
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const footnotes = new Map();
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for (let i = 0; i < lines.length; i++) {
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const match = lines[i].match(/^\[\^([^\]\s]+)\]:\s*(.*)$/);
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if (!match) continue;
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const body = [match[2]];
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let j = i + 1;
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while (j < lines.length && /^(?: {4}|\t)/.test(lines[j])) {
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body.push(lines[j].replace(/^(?: {4}|\t)/, ""));
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lines[j] = "";
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j++;
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}
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footnotes.set(match[1], body.join("\n"));
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lines[i] = "";
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}
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const closeList = () => {};
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const closeCode = () => {
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const body = escapeHtml(code.join("\n"));
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const lang = normalizeLanguage(language);
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if (lang === "mermaid") {
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html += `<div class="mermaid preview-source-line" data-source-line="${codeStart + lineOffset + 1}">${body}</div>`;
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} else if (codeLineStart !== null) {
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const numbered = body.split("\n").map((line, index) => `<span class="code-line" data-line="${codeLineStart + index}">${line || " "}</span>`).join("\n");
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const languageClass = lang ? ` class="language-${escapeHtml(lang)}"` : "";
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html += `<pre${attrs(codeStart, false, "", "", lineOffset).replace(' class="', ' class="code-with-lines ')}><code${languageClass}>${numbered}</code></pre>`;
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} else {
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const languageClass = lang ? ` class="language-${escapeHtml(lang)}"` : "";
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html += `<pre${attrs(codeStart, false, "", "", lineOffset)}><code${languageClass}>${body}</code></pre>`;
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}
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code = []; language = ""; codeLineStart = null; fence = "";
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};
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for (let index = 0; index < lines.length; index++) {
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const line = lines[index];
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const fenceMatch = line.match(/^\s*(```+|~~~+)\s*([^\s]*)\s*$/);
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if (fenceMatch) {
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closeList();
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if (inCode && fenceMatch[1][0] === fence[0] && fenceMatch[1].length >= fence.length) closeCode();
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else if (!inCode) {
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fence = fenceMatch[1];
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const info = fenceMatch[2] || "";
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// Generic syntax for every fenced code block:
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// ```rust=, ```python=101, ```= or ```=101.
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const numbered = info.match(/^(.*?)=(\d*)$/);
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language = numbered ? numbered[1] : info;
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codeLineStart = numbered ? Number(numbered[2] || 1) : null;
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codeStart = index;
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}
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inCode = !inCode;
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continue;
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}
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if (inCode) { code.push(line); continue; }
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const delimiter = index + 1 < lines.length ? tableDelimiter(lines[index + 1]) : null;
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if (line.includes("|") && delimiter) {
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closeList();
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const headers = splitTableRow(line);
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html += `<div class="table-wrap preview-source-line" data-source-line="${index + lineOffset + 1}"><table><thead><tr>`;
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headers.forEach((cell, i) => html += `<th class="preview-editable" contenteditable="true" spellcheck="true" data-source-line="${index + lineOffset + 1}" data-table-cell="${i}" style="text-align:${delimiter[i] || "left"}">${inline(cell)}</th>`);
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html += `</tr></thead><tbody>`;
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index += 2;
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while (index < lines.length && lines[index].includes("|") && lines[index].trim()) {
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const cells = splitTableRow(lines[index]);
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html += `<tr>`;
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headers.forEach((_, i) => html += `<td class="preview-editable" contenteditable="true" spellcheck="true" data-source-line="${index + lineOffset + 1}" data-table-cell="${i}" style="text-align:${delimiter[i] || "left"}">${inline(cells[i] || "")}</td>`);
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html += `</tr>`;
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index++;
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}
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html += `</tbody></table></div>`;
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index--;
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continue;
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}
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if (/^<details>\s*$/i.test(line.trim())) {
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closeList();
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let end = index + 1;
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while (end < lines.length && !/^<\/details>\s*$/i.test(lines[end].trim())) end++;
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if (end < lines.length) {
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const block = lines.slice(index + 1, end);
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let summary = "Details";
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while (block.length && !block[0].trim()) block.shift();
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if (block.length) {
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const summaryMatch = block[0].trim().match(/^<summary>([\s\S]*?)<\/summary>$/i);
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if (summaryMatch) { summary = summaryMatch[1].trim() || "Details"; block.shift(); }
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}
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while (block.length && !block[0].trim()) block.shift();
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html += `<details class="markdown-details preview-source-line" data-source-line="${index + lineOffset + 1}"><summary>${inline(summary)}</summary><div class="markdown-details__content">${renderMarkdown(block.join("\n"), lineOffset + index + 1)}</div></details>`;
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index = end;
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continue;
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}
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}
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if (/^\s*\[TOC\]\s*$/i.test(line)) {
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closeList();
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if (headings.length) {
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html += `<nav class="markdown-toc preview-source-line" data-source-line="${index + lineOffset + 1}" aria-label="Table of contents"><ol>`;
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headings.forEach(item => html += `<li class="toc-level-${item.level}"><a href="#${escapeHtml(item.id)}">${inline(item.text)}</a></li>`);
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html += `</ol></nav>`;
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}
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continue;
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}
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const alertStart = line.match(/^\s*:::(success|info|warning|danger)\s*$/i);
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if (alertStart) {
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closeList();
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let end = index + 1;
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while (end < lines.length && !/^\s*:::\s*$/.test(lines[end])) end++;
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if (end < lines.length) {
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const type = alertStart[1].toLowerCase();
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const body = lines.slice(index + 1, end).join("\n");
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html += `<aside class="markdown-alert markdown-alert--${type}" role="note">${renderMarkdown(body, lineOffset + index + 1)}</aside>`;
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index = end;
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continue;
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}
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}
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const heading = line.match(/^\s{0,4}(#{1,6})\s+(.+?)(?:\s+\{#([A-Za-z][\w:.-]*)\})?\s*$/);
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const listItem = listLine(line);
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if (listItem) {
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const rendered = renderList(lines, index, lineOffset, listItem.indent, listItem.type);
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html += rendered.html;
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index = rendered.end - 1;
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} else if (heading) {
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closeList();
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const n = heading[1].length;
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const resolved = headingByLine.get(index);
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const id = resolved?.id || heading[3] || headingSlug(heading[2]);
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const suffix = heading[3] ? ` {#${heading[3]}}` : "";
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html += `<h${n} id="${escapeHtml(id)}"${attrs(index, true, `${heading[1]} `, suffix, lineOffset)}>${inline(heading[2])}</h${n}>`;
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} else {
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closeList();
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const definition = index + 1 < lines.length && /^:\s+/.test(lines[index + 1]);
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if (line.trim() && definition) {
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html += `<dl${attrs(index, false, "", "", lineOffset)}><dt>${inline(line)}</dt>`;
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while (index + 1 < lines.length && /^:\s+/.test(lines[index + 1])) {
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index++;
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html += `<dd data-source-line="${index + lineOffset + 1}">${inline(lines[index].replace(/^:\s+/, ""))}</dd>`;
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}
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html += `</dl>`;
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} else if (/^---+$/.test(line.trim())) html += `<hr${attrs(index, false, "", "", lineOffset)}>`;
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else if (line.startsWith("> ")) html += `<blockquote${attrs(index, true, "> ", "", lineOffset)}>${inline(line.slice(2))}</blockquote>`;
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else if (line.trim()) html += `<p${attrs(index, true, "", "", lineOffset)}>${inline(line)}</p>`;
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else html += `<div${attrs(index, true, "", "", lineOffset)}><br></div>`;
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}
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}
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closeList();
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if (inCode) closeCode();
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if (footnotes.size) {
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html = html.replace(/<sup class="footnote-ref"><a href="#fn-([^"]+)" id="fnref-\1">\?<\/a><\/sup>/g, (_, id) => {
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const order = [...footnotes.keys()].indexOf(id) + 1;
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return `<sup class="footnote-ref"><a href="#fn-${id}" id="fnref-${id}">${order || "?"}</a></sup>`;
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});
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html += `<section class="footnotes"><hr><ol>`;
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for (const [id, body] of footnotes) {
|
|
html += `<li id="fn-${escapeHtml(id)}">${body.split("\n").map(part => inline(part)).join("<br>")} <a class="footnote-backref" href="#fnref-${escapeHtml(id)}" aria-label="Back to reference">↩</a></li>`;
|
|
}
|
|
html += `</ol></section>`;
|
|
}
|
|
return html;
|
|
}
|