planning

node_modules/hast-util-to-mdast/lib/handlers/media.js

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+'use strict'
+
+module.exports = media
+
+var convert = require('hast-util-is-element/convert')
+var toString = require('mdast-util-to-string')
+var visit = require('unist-util-visit')
+var all = require('../all')
+var resolve = require('../util/resolve')
+var wrap = require('../util/wrap')
+
+var source = convert('source')
+var video = convert('video')
+
+function media(h, node) {
+  var nodes = all(h, node)
+  var poster = video(node) && node.properties.poster
+  var src = node.properties.src
+  var index = -1
+  var linkInFallbackContent
+
+  visit({type: 'root', children: nodes}, 'link', findLink)
+
+  // If the content links to something, or if it’s not phrasing…
+  if (linkInFallbackContent || wrap.needed(nodes)) {
+    return nodes
+  }
+
+  // Find the source.
+  while (!src && ++index < node.children.length) {
+    if (source(node.children[index])) {
+      src = node.children[index].properties.src
+    }
+  }
+
+  // If there’s a poster defined on the video, create an image.
+  if (poster) {
+    nodes = [
+      {
+        type: 'image',
+        title: null,
+        url: resolve(h, poster),
+        alt: toString({children: nodes})
+      }
+    ]
+  }
+
+  // Link to the media resource.
+  return {
+    type: 'link',
+    title: node.properties.title || null,
+    url: resolve(h, src),
+    children: nodes
+  }
+
+  function findLink() {
+    linkInFallbackContent = true
+    return visit.EXIT
+  }
+}