implement initial unified/remark preview update

package.json

@@ -157,6 +157,7 @@
     "redux-notifications": "^2.1.1",
     "redux-optimist": "^0.0.2",
     "redux-thunk": "^1.0.3",
+    "rehype-parse": "^3.1.0",
     "rehype-stringify": "^3.0.0",
     "remark-html": "^6.0.0",
     "remark-parse": "^3.0.1",
@@ -168,7 +169,6 @@
     "slug": "^0.9.1",
     "textarea-caret-position": "^0.1.1",
     "unified": "^6.1.4",
-    "unist-util-visit": "^1.1.1",
     "uuid": "^2.0.3",
     "whatwg-fetch": "^1.0.0"
   },

src/components/MarkupItReactRenderer/index.js

@@ -1,30 +1,92 @@
 import React, { PropTypes } from "react";
+import { renderToStaticMarkup } from 'react-dom/server';
+import { Map } from 'immutable';
 import unified from 'unified';
 import markdown from 'remark-parse';
 import rehype from 'remark-rehype';
+import parseHtml from 'rehype-parse';
 import html from 'rehype-stringify';
 import registry from "../../lib/registry";
 
-export default class MarkupItReactRenderer extends React.Component {
-  constructor(props) {
-    super(props);
-    this.plugins = {};
-    // TODO add back support for this.
-    registry.getEditorComponents().forEach((component) => {
-      this.plugins[component.get("id")] = component;
-    });
+const getPlugins = () => registry.getEditorComponents();
+
+const renderEditorPlugins = ({ getAsset }) => {
+  return tree => {
+    const result = renderEditorPluginsProcessor(tree, getAsset);
+    return result;
+  };
+};
+
+const renderEditorPluginsProcessor = (node, getAsset) => {
+
+  if (node.children) {
+
+    node.children = node.children.map(n => renderEditorPluginsProcessor(n, getAsset));
+
+    // Handle externally defined plugins (they'll be wrapped in paragraphs)
+    if (node.tagName === 'p' && node.children.length === 1 && node.children[0].type === 'text') {
+      const value = node.children[0].value;
+      const plugin = getPlugins().find(plugin => plugin.get('pattern').test(value));
+      if (plugin) {
+        const data = plugin.get('fromBlock')(value.match(plugin.get('pattern')));
+        const preview = plugin.get('toPreview')(data);
+        const output = typeof preview === 'string' ?
+          <div dangerouslySetInnerHTML={{ __html: preview }}/> :
+          preview;
+
+        const result = unified()
+          .use(parseHtml, { fragment: true })
+          .parse(renderToStaticMarkup(output));
+
+        return result.children[0];
+      }
+    }
   }
 
-  render() {
+  // Handle the internally defined image plugin. At this point the token has
+  // already been parsed as an image by Remark, so we have to catch it by
+  // checking for the 'image' type.
+  if (node.tagName === 'img') {
+    const { src, alt } = node.properties;
+
+    // Until we improve the editor components API for built in components,
+    // we'll mock the result of String.prototype.match to pass in to the image
+    // plugin's fromBlock method.
+    const plugin = getPlugins().get('image');
+    if (plugin) {
+      const matches = [ , alt, src ];
+      const data = plugin.get('fromBlock')(matches);
+      const extendedData = { ...data, image: getAsset(data.image).toString() };
+      const preview = plugin.get('toPreview')(extendedData);
+      const output = typeof preview === 'string' ?
+        <div dangerouslySetInnerHTML={{ __html: preview }}/> :
+        preview;
+
+      const result = unified()
+        .use(parseHtml, { fragment: true })
+        .parse(renderToStaticMarkup(output));
+
+      return result.children[0];
+    }
+  }
+
+  return node;
+};
+
+const MarkupItReactRenderer = ({ value, getAsset }) => {
   const doc = unified()
     .use(markdown, { commonmark: true, footnotes: true, pedantic: true })
     .use(rehype, { allowDangerousHTML: true })
+    .use(renderEditorPlugins, { getAsset })
     .use(html, { allowDangerousHTML: true })
-      .processSync(this.props.value);
+    .processSync(value);
+
   return <div dangerouslySetInnerHTML={{ __html: doc }} />; // eslint-disable-line react/no-danger
 }
-}
+
+export default MarkupItReactRenderer;
 
 MarkupItReactRenderer.propTypes = {
   value: PropTypes.string,
+  getAsset: PropTypes.func.isRequired,
 };

src/components/Widgets/MarkdownControlElements/VisualEditor/__tests__/parser.spec.js

@@ -1,8 +1,7 @@
 import { fromJS } from 'immutable';
 import { Schema } from "prosemirror-model";
 import { schema } from "prosemirror-markdown";
-
-const makeParser = require("../parser");
+import makeParser from '../parser';
 
 const testSchema = new Schema({
   nodes: schema.nodeSpec,

src/components/Widgets/MarkdownControlElements/VisualEditor/parser.js

@@ -6,7 +6,6 @@
 
 import unified from 'unified';
 import markdown from 'remark-parse';
-import visit from 'unist-util-visit';
 import { Mark } from 'prosemirror-model';
 
 let schema;
@@ -133,6 +132,8 @@ const processMdastNode = node => {
     activeMarks = mark.removeFromSet(activeMarks);
     return;
   }
+
+  return node;
 };
 
 const compileMarkdownToProseMirror = src => {