Add support for <iframe> to link or ignoring

Closes GH-48.

lib/handlers/iframe.js

@@ -0,0 +1,23 @@
+'use strict'
+
+module.exports = iframe
+
+var resolve = require('../util/resolve')
+
+function iframe(h, node) {
+  var src = node.properties.src
+  var title = node.properties.title
+
+  // Only create a link if there is a title.
+  // We can’t use `content` because conforming HTML parsers treat it as text,
+  // whereas legacy parsers treat it as HTML, so they will likely contain tags
+  // that will show up in text.
+  if (src && title) {
+    return {
+      type: 'link',
+      title: null,
+      url: resolve(h, src),
+      children: [{type: 'text', value: title}]
+    }
+  }
+}

lib/handlers/index.js

@@ -12,6 +12,7 @@ var dataList = require('./data-list')
 var del = require('./delete')
 var emphasis = require('./emphasis')
 var heading = require('./heading')
+var iframe = require('./iframe')
 var image = require('./image')
 var inlineCode = require('./inline-code')
 var link = require('./link')
@@ -149,6 +150,7 @@ exports.h5 = heading
 exports.h6 = heading
 exports.hr = thematicBreak
 exports.i = emphasis
+exports.iframe = iframe
 exports.img = image
 exports.image = image
 exports.kbd = inlineCode

lib/handlers/list-item.js

@@ -44,15 +44,6 @@ function listItem(h, node) {
     }
   }
 
-  // Drop empty paragraph.
-  if (content.length === 1) {
-    head = content[0]
-
-    if (head.type === 'paragraph' && head.children.length === 0) {
-      content = []
-    }
-  }
-
   return h(
     node,
     'listItem',

lib/handlers/paragraph.js

@@ -5,5 +5,12 @@ module.exports = paragraph
 var all = require('../all')
 
 function paragraph(h, node) {
-  return h(node, 'paragraph', all(h, node))
+  var children = node.children
+  var nodes = all(h, node)
+
+  if (children && children.length !== 0 && nodes.length === 0) {
+    return
+  }
+
+  return h(node, 'paragraph', nodes)
 }

test/fixtures/iframe/index.html

@@ -0,0 +1,13 @@
+<p><iframe sandbox srcdoc="<em>alpha</em>"></iframe></p>
+
+<p><iframe src="bravo.html" sandbox></iframe></p>
+
+<p>
+  <iframe src="charlie.html" title="Delta">
+    Echo <code>foxtrot</code> <em>golf</em>.
+  </iframe>
+</p>
+
+<p><iframe src="hotel.html" title="India"></iframe></p>
+
+<p><iframe src="juliett.html"></iframe></p>

test/fixtures/iframe/index.json

@@ -0,0 +1,3 @@
+{
+  "fragment": true
+}

test/fixtures/iframe/index.md

@@ -0,0 +1,3 @@
+[Delta](charlie.html)
+
+[India](hotel.html)