466 lines
11 KiB
TypeScript
466 lines
11 KiB
TypeScript
import {
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addParentPointers,
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collectNodesOfType,
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findNodeOfType,
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ParseTree,
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renderToText,
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traverseTree,
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} from "$sb/lib/tree.ts";
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import { Fragment, renderHtml, Tag } from "./html_render.ts";
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type MarkdownRenderOptions = {
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failOnUnknown?: true;
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smartHardBreak?: true;
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annotationPositions?: true;
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attachmentUrlPrefix?: string;
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preserveAttributes?: true;
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// When defined, use to inline images as data: urls
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translateUrls?: (url: string) => string;
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};
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function cleanTags(values: (Tag | null)[], cleanWhitespace = false): Tag[] {
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const result: Tag[] = [];
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for (const value of values) {
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if (cleanWhitespace && typeof value === "string" && value.match(/^\s+$/)) {
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continue;
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}
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if (value) {
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result.push(value);
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}
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}
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return result;
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}
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function preprocess(t: ParseTree, options: MarkdownRenderOptions = {}) {
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addParentPointers(t);
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traverseTree(t, (node) => {
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if (!node.type) {
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if (node.text?.startsWith("\n")) {
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const prevNodeIdx = node.parent!.children!.indexOf(node) - 1;
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if (node.parent!.children![prevNodeIdx]?.type !== "Paragraph") {
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node.text = node.text.slice(1);
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}
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}
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}
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return false;
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});
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}
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function posPreservingRender(
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t: ParseTree,
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options: MarkdownRenderOptions = {},
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): Tag | null {
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const tag = render(t, options);
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if (!options.annotationPositions) {
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return tag;
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}
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if (!tag) {
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return null;
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}
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if (typeof tag === "string") {
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return tag;
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}
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if (t.from) {
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if (!tag.attrs) {
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tag.attrs = {};
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}
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tag.attrs["data-pos"] = "" + t.from;
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}
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return tag;
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}
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function render(
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t: ParseTree,
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options: MarkdownRenderOptions = {},
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): Tag | null {
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if (t.type?.endsWith("Mark") || t.type?.endsWith("Delimiter")) {
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return null;
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}
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switch (t.type) {
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case "Document":
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return {
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name: Fragment,
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body: cleanTags(mapRender(t.children!)),
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};
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case "FrontMatter":
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return null;
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case "CommentBlock":
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// Remove, for now
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return null;
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case "ATXHeading1":
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return {
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name: "h1",
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body: cleanTags(mapRender(t.children!)),
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};
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case "ATXHeading2":
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return {
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name: "h2",
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body: cleanTags(mapRender(t.children!)),
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};
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case "ATXHeading3":
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return {
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name: "h3",
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body: cleanTags(mapRender(t.children!)),
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};
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case "ATXHeading4":
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return {
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name: "h4",
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body: cleanTags(mapRender(t.children!)),
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};
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case "ATXHeading5":
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return {
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name: "h5",
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body: cleanTags(mapRender(t.children!)),
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};
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case "Paragraph":
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return {
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name: "span",
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attrs: {
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class: "p",
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},
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body: cleanTags(mapRender(t.children!)),
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};
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// Code blocks
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case "FencedCode":
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case "CodeBlock": {
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// Clear out top-level indent blocks
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const lang = findNodeOfType(t, "CodeInfo");
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t.children = t.children!.filter((c) => c.type);
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return {
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name: "pre",
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attrs: {
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"data-lang": lang ? lang.children![0].text : undefined,
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},
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body: cleanTags(mapRender(t.children!)),
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};
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}
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case "CodeInfo":
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return null;
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case "CodeText":
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return t.children![0].text!;
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case "Blockquote":
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return {
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name: "blockquote",
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body: cleanTags(mapRender(t.children!)),
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};
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case "HardBreak":
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return {
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name: "br",
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body: "",
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};
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// Basic styling
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case "Emphasis":
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return {
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name: "em",
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body: cleanTags(mapRender(t.children!)),
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};
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case "Highlight":
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return {
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name: "span",
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attrs: {
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class: "highlight",
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},
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body: cleanTags(mapRender(t.children!)),
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};
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case "Strikethrough":
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return {
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name: "del",
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body: cleanTags(mapRender(t.children!)),
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};
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case "InlineCode":
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return {
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name: "tt",
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body: cleanTags(mapRender(t.children!)),
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};
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case "BulletList":
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return {
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name: "ul",
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body: cleanTags(mapRender(t.children!), true),
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};
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case "OrderedList":
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return {
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name: "ol",
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body: cleanTags(mapRender(t.children!), true),
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};
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case "ListItem":
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return {
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name: "li",
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body: cleanTags(mapRender(t.children!), true),
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};
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case "StrongEmphasis":
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return {
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name: "strong",
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body: cleanTags(mapRender(t.children!)),
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};
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case "HorizontalRule":
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return {
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name: "hr",
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body: "",
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};
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case "Link": {
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const linkText = t.children![1].text!;
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const urlNode = findNodeOfType(t, "URL");
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if (!urlNode) {
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return renderToText(t);
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}
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let url = urlNode.children![0].text!;
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if (url.indexOf("://") === -1) {
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url = `${options.attachmentUrlPrefix || ""}${url}`;
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}
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return {
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name: "a",
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attrs: {
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href: url,
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},
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body: linkText,
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};
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}
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case "Image": {
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const altText = t.children![1].text!;
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const urlNode = findNodeOfType(t, "URL");
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if (!urlNode) {
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return renderToText(t);
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}
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let url = urlNode!.children![0].text!;
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if (url.indexOf("://") === -1) {
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url = `${options.attachmentUrlPrefix || ""}${url}`;
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}
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return {
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name: "img",
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attrs: {
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src: url,
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alt: altText,
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},
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body: "",
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};
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}
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// Custom stuff
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case "WikiLink": {
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// console.log("WikiLink", JSON.stringify(t, null, 2));
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const ref = findNodeOfType(t, "WikiLinkPage")!.children![0].text!;
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let linkText = ref.split("/").pop()!;
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const aliasNode = findNodeOfType(t, "WikiLinkAlias");
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if (aliasNode) {
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linkText = aliasNode.children![0].text!;
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}
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return {
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name: "a",
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attrs: {
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href: `/${ref.replace("@", "#")}`,
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"data-ref": ref,
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},
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body: linkText,
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};
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}
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case "NakedURL": {
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const url = t.children![0].text!;
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return {
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name: "a",
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attrs: {
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href: url,
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},
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body: url,
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};
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}
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case "Hashtag":
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return {
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name: "strong",
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body: t.children![0].text!,
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};
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case "Task": {
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let externalTaskRef = "";
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collectNodesOfType(t, "WikiLinkPage").forEach((wikilink) => {
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const ref = wikilink.children![0].text!;
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if (!externalTaskRef && ref.includes("@")) {
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externalTaskRef = ref;
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}
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});
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return {
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name: "span",
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attrs: externalTaskRef
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? {
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"data-external-task-ref": externalTaskRef,
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}
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: {},
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body: cleanTags(mapRender(t.children!)),
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};
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}
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case "TaskState": {
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// child[0] = marker, child[1] = state, child[2] = marker
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const stateText = t.children![1].text!;
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if ([" ", "x", "X"].includes(stateText)) {
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return {
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name: "input",
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attrs: {
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type: "checkbox",
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checked: stateText !== " " ? "checked" : undefined,
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"data-state": stateText,
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},
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body: "",
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};
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} else {
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return {
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name: "span",
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attrs: {
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class: "task-state",
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},
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body: stateText,
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};
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}
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}
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case "NamedAnchor":
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return {
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name: "a",
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attrs: {
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name: t.children![0].text?.substring(1),
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},
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body: "",
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};
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case "CommandLink": {
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// Child 0 is CommandLinkMark, child 1 is CommandLinkPage
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const commandText = t.children![1].children![0].text!;
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return {
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name: "button",
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attrs: {
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"data-onclick": JSON.stringify(["command", commandText]),
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},
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body: commandText,
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};
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}
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case "DeadlineDate":
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return renderToText(t);
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// Tables
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case "Table":
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return {
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name: "table",
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body: cleanTags(mapRender(t.children!)),
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};
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case "TableHeader":
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return {
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name: "thead",
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body: [
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{
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name: "tr",
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body: cleanTags(mapRender(t.children!)),
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},
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],
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};
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case "TableCell":
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return {
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name: "td",
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body: cleanTags(mapRender(t.children!)),
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};
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case "TableRow": {
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const children = t.children!;
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const newChildren: ParseTree[] = [];
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// Ensure there is TableCell in between every delimiter
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let lookingForCell = false;
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for (const child of children) {
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if (child.type === "TableDelimiter" && lookingForCell) {
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// We were looking for a cell, but didn't fine one: empty cell!
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// Let's inject an empty one
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newChildren.push({
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type: "TableCell",
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children: [],
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});
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}
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if (child.type === "TableDelimiter") {
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lookingForCell = true;
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}
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if (child.type === "TableCell") {
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lookingForCell = false;
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}
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newChildren.push(child);
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}
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return {
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name: "tr",
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body: cleanTags(mapRender(newChildren)),
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};
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}
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case "Directive": {
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const body = findNodeOfType(t, "DirectiveBody")!;
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return posPreservingRender(body.children![0], options);
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}
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case "Attribute":
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if (options.preserveAttributes) {
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return {
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name: "span",
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attrs: {
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class: "attribute",
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},
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body: renderToText(t),
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};
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}
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return null;
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case "Escape": {
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return {
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name: "span",
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attrs: {
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class: "escape",
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},
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body: t.children![0].text!.slice(1),
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};
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}
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// Text
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case undefined:
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return t.text!;
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default:
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if (options.failOnUnknown) {
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console.error("Not handling", JSON.stringify(t, null, 2));
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throw new Error(`Unknown markdown node type ${t.type}`);
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} else {
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// Falling back to rendering verbatim
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console.warn("Not handling", JSON.stringify(t, null, 2));
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return renderToText(t);
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}
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}
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function mapRender(children: ParseTree[]) {
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return children.map((t) => posPreservingRender(t, options));
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}
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}
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function traverseTag(
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t: Tag,
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fn: (t: Tag) => void,
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) {
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fn(t);
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if (typeof t === "string") {
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return;
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}
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if (t.body) {
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for (const child of t.body) {
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traverseTag(child, fn);
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}
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}
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}
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export function renderMarkdownToHtml(
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t: ParseTree,
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options: MarkdownRenderOptions = {},
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) {
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preprocess(t, options);
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const htmlTree = posPreservingRender(t, options);
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if (htmlTree && options.translateUrls) {
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traverseTag(htmlTree, (t) => {
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if (typeof t === "string") {
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return;
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}
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if (t.name === "img") {
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t.attrs!.src = options.translateUrls!(t.attrs!.src!);
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}
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if (t.name === "a" && t.attrs!.href) {
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t.attrs!.href = options.translateUrls!(t.attrs!.href);
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}
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});
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}
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return renderHtml(htmlTree);
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}
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