From c05448d50ce31f69a7f719e378da2d6ded5477a7 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Fri, 6 Apr 2018 17:08:01 -0400
Subject: [PATCH] support using component at root level

---
 README.md                                    |  2 +
 docs/.vuepress/components/OtherComponent.vue |  3 +
 docs/.vuepress/components/demo-1.vue         |  6 +-
 docs/assets.md                               |  0
 docs/test.md                                 |  5 ++
 docs/using-vue.md                            | 36 +++++++--
 lib/default-theme/styles.css                 |  6 ++
 lib/markdown/component.js                    | 81 ++++++++++++++++++++
 lib/markdown/hoist.js                        |  3 +
 lib/markdown/index.js                        |  6 +-
 10 files changed, 136 insertions(+), 12 deletions(-)
 create mode 100644 docs/.vuepress/components/OtherComponent.vue
 create mode 100644 docs/assets.md
 create mode 100644 docs/test.md
 create mode 100644 lib/markdown/component.js
 create mode 100644 lib/markdown/hoist.js

diff --git a/README.md b/README.md
index 376b6ed017..7ed6e15e4a 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@
 
 - Vue-powered: the layout system is a Vue app. It's also pre-rendered into static HTML. And you can register and use Vue components inside markdown content.
 
+  - Deep markdown customization to make using Vue inside markdown a breeze.
+
 - Docs first: most of your content will be in Markdown.
 
 - Largely gitbook compatible: should be easy to migrate existing gitbook docs over, and maintain original URLs.
diff --git a/docs/.vuepress/components/OtherComponent.vue b/docs/.vuepress/components/OtherComponent.vue
new file mode 100644
index 0000000000..1d97c7ca8e
--- /dev/null
+++ b/docs/.vuepress/components/OtherComponent.vue
@@ -0,0 +1,3 @@
+<template>
+  <p class="demo">This is another component</p>
+</template>
diff --git a/docs/.vuepress/components/demo-1.vue b/docs/.vuepress/components/demo-1.vue
index 085af055ed..f1dfb581c5 100644
--- a/docs/.vuepress/components/demo-1.vue
+++ b/docs/.vuepress/components/demo-1.vue
@@ -1,14 +1,14 @@
 <template>
-  <div>
+  <p class="demo">
     {{ msg }}
-  </div>
+  </p>
 </template>
 
 <script>
 export default {
   data () {
     return {
-      msg: 'hello this is a dynamic demo'
+      msg: 'Hello this is <demo-1>'
     }
   }
 }
diff --git a/docs/assets.md b/docs/assets.md
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/docs/test.md b/docs/test.md
new file mode 100644
index 0000000000..8d5c7ab7e5
--- /dev/null
+++ b/docs/test.md
@@ -0,0 +1,5 @@
+<demo-1></demo-1>
+
+<Demo>
+  <p>hello</p>
+</Demo>
diff --git a/docs/using-vue.md b/docs/using-vue.md
index 243ba44273..06cb227221 100644
--- a/docs/using-vue.md
+++ b/docs/using-vue.md
@@ -56,23 +56,43 @@ Any `*.vue` file found in `.vuepress/components` are automatically registered as
 .
 └── .vuepress
     └── components
-        └── demo-1.vue
+        ├── demo-1.vue
+        └── OtherComponent.vue
 ```
 
-Inside any markdown file you can then use the component like so:
+Inside any markdown file you can then directly use the components (names are inferred from filenames):
 
 ``` markdown
-<div>
-  <demo-1/>
-</div>
+<demo-1/>
+<OtherComponent/>
 ```
 
+<demo-1></demo-1>
+
+<OtherComponent/>
+
 ::: warning
-Note **components must be nested inside a `<div>`**, because otherwise they'd be automatically wrapped inside a `<p>`, which can only contain inline elements. If your component contains block level elements (it mostly likely does), it will cause hydration mismatch in static builds.
+Make sure a custom component's names either contains a hyphen or is in PascalCase. Otherwise it will be treated as an inline element and wrapped inside a `<p>` tag, which will lead to hydration mismatch because `<p>` does not allow block elements to be placed inside it.
 :::
 
 ## Script & Style Hoisting
 
-(TODO)
-
 Sometimes you may need to apply some JavaScript or CSS only to the current page. In those case you can directly write root-level `<script>` or `<style>` blocks in the markdown file, and they will be hoisted out of the compiled HTML and used as the `<script>` and `<style>` blocks for the resulting Vue single-file component.
+
+<div id="inline-script-style-example"></div>
+
+<!-- <style>
+#inline-script-style-example {
+  color: #41b883;
+}
+</style>
+
+<script>
+export default {
+  mounted () {
+    document.getElementById('inline-script-style-example')
+      .textContent = 'Hello from inline script!'
+  }
+}
+</script>
+ -->
diff --git a/lib/default-theme/styles.css b/lib/default-theme/styles.css
index 0167c2140c..42487f6e46 100644
--- a/lib/default-theme/styles.css
+++ b/lib/default-theme/styles.css
@@ -40,6 +40,12 @@ div.danger {
   background-color: red;
 }
 
+p.demo {
+  padding: 1rem;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+}
+
 /*
   Copied from nprogress since it doens't
   allow programmatic configuration of color
diff --git a/lib/markdown/component.js b/lib/markdown/component.js
new file mode 100644
index 0000000000..749adf43ed
--- /dev/null
+++ b/lib/markdown/component.js
@@ -0,0 +1,81 @@
+// Replacing the default htmlBlock rule to allow using custom components at
+// root level
+
+const blockNames = require('markdown-it/lib/common/htmlBlocks')
+const HTML_OPEN_CLOSE_TAG_RE = require('markdown-it/lib/common/html_re').HTML_OPEN_CLOSE_TAG_RE
+
+// An array of opening and corresponding closing sequences for html tags,
+// last argument defines whether it can terminate a paragraph or not
+const HTML_SEQUENCES = [
+  [/^<(script|pre|style)(?=(\s|>|$))/i, /<\/(script|pre|style)>/i, true],
+  [/^<!--/, /-->/, true],
+  [/^<\?/, /\?>/, true],
+  [/^<![A-Z]/, />/, true],
+  [/^<!\[CDATA\[/, /\]\]>/, true],
+  // PascalCase Components
+  [/^<[A-Z]/, />/, true],
+  // custom elements with hyphens
+  [/^<\w+\-/, />/, true],
+  [new RegExp('^</?(' + blockNames.join('|') + ')(?=(\\s|/?>|$))', 'i'), /^$/, true],
+  [new RegExp(HTML_OPEN_CLOSE_TAG_RE.source + '\\s*$'), /^$/, false]
+]
+
+module.exports = md => {
+  md.block.ruler.at('htmlBlock', htmlBlock)
+}
+
+function htmlBlock (state, startLine, endLine, silent) {
+  let i, nextLine, lineText
+  let pos = state.bMarks[startLine] + state.tShift[startLine]
+  let max = state.eMarks[startLine]
+
+  // if it's indented more than 3 spaces, it should be a code block
+  if (state.sCount[startLine] - state.blkIndent >= 4) { return false }
+
+  if (!state.md.options.html) { return false }
+
+  if (state.src.charCodeAt(pos) !== 0x3C/* < */) { return false }
+
+  lineText = state.src.slice(pos, max)
+
+  for (i = 0; i < HTML_SEQUENCES.length; i++) {
+    if (HTML_SEQUENCES[i][0].test(lineText)) { break }
+  }
+
+  if (i === HTML_SEQUENCES.length) {
+    console.log(lineText)
+    return false
+  }
+
+  if (silent) {
+    // true if this sequence can be a terminator, false otherwise
+    return HTML_SEQUENCES[i][2]
+  }
+
+  nextLine = startLine + 1
+
+  // If we are here - we detected HTML block.
+  // Let's roll down till block end.
+  if (!HTML_SEQUENCES[i][1].test(lineText)) {
+    for (; nextLine < endLine; nextLine++) {
+      if (state.sCount[nextLine] < state.blkIndent) { break }
+
+      pos = state.bMarks[nextLine] + state.tShift[nextLine]
+      max = state.eMarks[nextLine]
+      lineText = state.src.slice(pos, max)
+
+      if (HTML_SEQUENCES[i][1].test(lineText)) {
+        if (lineText.length !== 0) { nextLine++ }
+        break
+      }
+    }
+  }
+
+  state.line = nextLine
+
+  const token = state.push('htmlBlock', '', 0)
+  token.map = [startLine, nextLine]
+  token.content = state.getLines(startLine, nextLine, state.blkIndent, true)
+
+  return true
+}
diff --git a/lib/markdown/hoist.js b/lib/markdown/hoist.js
new file mode 100644
index 0000000000..fb54163953
--- /dev/null
+++ b/lib/markdown/hoist.js
@@ -0,0 +1,3 @@
+module.exports = md => {
+
+}
diff --git a/lib/markdown/index.js b/lib/markdown/index.js
index 5895292545..9c1eaf8f73 100644
--- a/lib/markdown/index.js
+++ b/lib/markdown/index.js
@@ -1,5 +1,6 @@
 const highlight = require('./highlight')
 const highlightLines = require('./highlightLines')
+const component = require('./component')
 const convertRouterLink = require('./link')
 const emoji = require('markdown-it-emoji')
 const anchor = require('markdown-it-anchor')
@@ -16,8 +17,11 @@ module.exports = ({ markdown = {}}) => {
     typographer: true,
     highlight
   })
-    .use(convertRouterLink)
+    // custom plugins
+    .use(component)
     .use(highlightLines)
+    .use(convertRouterLink)
+    // 3rd party plugins
     .use(emoji)
     .use(anchor, Object.assign({ permalink: true, permalinkBefore: true }, markdown.anchor))
     .use(toc, Object.assign({ includeLevel: [2, 3] }, markdown.toc))