Add support for Vue

Closes GH-7.
Closes GH-15.
Closes GH-17.

Reviewed-by: Christian Murphy <christian.murphy.42@gmail.com>

Co-authored-by: Mehdi Lahlou <mehdi.lahlou@free.fr>

Author: wooorm

index.js

@@ -18,6 +18,7 @@ function wrapper(h, node, options) {
   var prefix
   var r
   var v
+  var vd
 
   if (typeof h !== 'function') {
     throw new Error('h is not a function')
@@ -31,10 +32,11 @@ function wrapper(h, node, options) {
   }
 
   r = react(h)
-  v = vdom(h)
+  v = vue(h)
+  vd = vdom(h)
 
   if (prefix === null || prefix === undefined) {
-    prefix = r === true || v === true ? 'h-' : false
+    prefix = r === true || v === true || vd === true ? 'h-' : false
   }
 
   if (is('root', node)) {
@@ -59,7 +61,8 @@ function wrapper(h, node, options) {
     prefix: prefix,
     key: 0,
     react: r,
-    vdom: v,
+    vue: v,
+    vdom: vd,
     hyperscript: hyperscript(h)
   })
 }
@@ -98,9 +101,9 @@ function toH(h, node, ctx) {
 
   if (
     typeof attributes.style === 'string' &&
-    (ctx.vdom === true || ctx.react === true)
+    (ctx.vdom === true || ctx.vue === true || ctx.react === true)
   ) {
-    // VDOM and React accept `style` as object.
+    // VDOM, Vue, and React accept `style` as object.
     attributes.style = parseStyle(attributes.style, name)
   }
 
@@ -140,7 +143,7 @@ function toH(h, node, ctx) {
 }
 
 function addAttribute(props, prop, value, ctx) {
-  var hyperlike = ctx.hyperscript || ctx.vdom
+  var hyperlike = ctx.hyperscript || ctx.vdom || ctx.vue
   var schema = ctx.schema
   var info = find(schema, prop)
   var subprop
@@ -167,7 +170,11 @@ function addAttribute(props, prop, value, ctx) {
     value = ''
   }
 
-  if (!info.mustUseProperty) {
+  if (ctx.vue) {
+    if (prop !== 'style') {
+      subprop = 'attrs'
+    }
+  } else if (!info.mustUseProperty) {
     if (ctx.vdom === true) {
       subprop = 'attributes'
     } else if (ctx.hyperscript === true) {
@@ -204,6 +211,11 @@ function vdom(h) {
   return h && h('div').type === 'VirtualNode'
 }
 
+function vue(h) {
+  var node = h && h('div')
+  return Boolean(node && node.context && node.context._isVue)
+}
+
 function parseStyle(value, tagName) {
   var result = {}
 

package.json

@@ -47,6 +47,8 @@
     "unist-builder": "^1.0.1",
     "vdom-to-html": "^2.3.1",
     "virtual-dom": "^2.1.1",
+    "vue": "^2.6.10",
+    "vue-server-renderer": "^2.6.10",
     "xo": "^0.24.0"
   },
   "scripts": {

test.js

@@ -10,6 +10,8 @@ var r = require('react').createElement
 var rehype = require('rehype')
 var vToString = require('vdom-to-html')
 var rToString = require('react-dom/server').renderToStaticMarkup
+var Vue = require('vue')
+var VueSSR = require('vue-server-renderer')
 var toH = require('.')
 
 var processor = rehype().data('settings', {fragment: true, position: false})
@@ -386,6 +388,119 @@ test('hast-to-hyperscript', function(t) {
     st.end()
   })
 
+  t.test('should support `Vue`', function(st) {
+    var baseline = doc.replace(/<div>/, '<div data-server-rendered="true">')
+    var actual
+    var expected
+
+    st.plan(3)
+
+    Promise.all([vueToString(actualRender), vueToString(expectedRender)])
+      .then(function(all) {
+        var actualString = all[0]
+        var expectedString = all[0]
+
+        st.deepEqual(clean(actual), clean(expected), 'equal syntax trees')
+        st.deepEqual(html(actualString), html(baseline), 'equal output')
+
+        st.deepEqual(
+          html(expectedString),
+          html(baseline),
+          'equal output baseline'
+        )
+      })
+      .catch(function(error) {
+        st.ifErr(error, 'did not expect an error')
+      })
+
+    function actualRender(h) {
+      actual = toH(h, hast)
+      return actual
+    }
+
+    function expectedRender(h) {
+      expected = h(
+        'div',
+        {key: 'h-1', attrs: {'data-server-rendered': 'true'}},
+        [
+          h(
+            'h1',
+            {
+              key: 'h-2',
+              attrs: {
+                class: 'b c',
+                id: 'a',
+                hidden: true,
+                height: 2
+              }
+            },
+            [
+              'bravo ',
+              h(
+                'strong',
+                {
+                  key: 'h-3',
+                  style: {color: 'red'},
+                  attrs: {
+                    foo: 'bar',
+                    camelCase: 'on off',
+                    'data-123': '456',
+                    'data-some': 'yes',
+                    'aria-valuenow': '1'
+                  }
+                },
+                ['charlie']
+              ),
+              ' delta',
+              h('input', {
+                key: 'h-4',
+                attrs: {
+                  checked: true,
+                  type: 'file',
+                  accept: '.jpg, .jpeg'
+                }
+              })
+            ]
+          ),
+          h(
+            'svg',
+            {
+              key: 'h-5',
+              attrs: {
+                xmlns: 'http://www.w3.org/2000/svg',
+                viewBox: '0 0 500 500'
+              }
+            },
+            [h('circle', {key: 'h-6', attrs: {cx: 120, cy: 120, r: 100}})]
+          )
+        ]
+      )
+      return expected
+    }
+
+    function identity(value) {
+      return value
+    }
+
+    function vueToString(render) {
+      return VueSSR.createRenderer({template: identity}).renderToString(
+        new Vue({render: render}).$mount()
+      )
+    }
+
+    function clean(node) {
+      remove(node)
+      return json(node)
+    }
+
+    function remove(node) {
+      delete node.context
+      if (node.children) {
+        node.children.forEach(remove)
+      }
+    }
+  })
+
   t.test('should support keys', function(st) {
     st.equal(
       toH(h, u('element', {tagName: 'div'})).key,
@@ -508,9 +623,7 @@ test('hast-to-hyperscript', function(t) {
     st.end()
   })
 
-  t.test('flattens a `root` with one element child to that child', function(
-    st
-  ) {
+  t.test('flattens a `root` with one element to that child', function(st) {
     var actual = toH(
       h,
       u('root', [u('element', {tagName: 'h1', properties: {id: 'a'}}, [])])