Bundle our own spellchecker

Signed-off-by: Yukai Huang <yukaihuangtw@gmail.com>

package.json

@@ -188,6 +188,7 @@
     "standard": "~13.1.0",
     "string-loader": "~0.0.1",
     "style-loader": "~0.23.1",
+    "typo-js": "^1.0.3",
     "uglifyjs-webpack-plugin": "~1.2.7",
     "url-loader": "~1.0.1",
     "webpack": "~4.39.0",

public/js/lib/editor/index.js

@@ -7,6 +7,7 @@ import config from './config'
 import statusBarTemplate from './statusbar.html'
 import toolBarTemplate from './toolbar.html'
 import './markdown-lint'
+import CodeMirrorSpellChecker from './spellcheck'
 import { initTableEditor } from './table-editor'
 import { availableThemes } from './constants'
 
@@ -723,6 +724,8 @@ export default class Editor {
       placeholder: "← Start by entering a title here\n===\nVisit /features if you don't know what to do.\nHappy hacking :)"
     })
 
+    // eslint-disable-next-line
+    new CodeMirrorSpellChecker(CodeMirror)
     this.tableEditor = initTableEditor(this.editor)
 
     return this.editor

public/js/lib/editor/spellcheck.js

@@ -0,0 +1,112 @@
+/* eslint-env browser */
+
+// Modified from https://github.com/sparksuite/codemirror-spell-checker
+
+import Typo from 'typo-js'
+import { serverurl } from '../config'
+
+const dictionaryDownloadUrls = {
+  en_US: {
+    aff: `${serverurl}/vendor/codemirror-spell-checker/en_US.aff`,
+    dic: `${serverurl}/vendor/codemirror-spell-checker/en_US.dic`
+  }
+}
+
+class CodeMirrorSpellChecker {
+  /**
+   * @param {CodeMirror} cm
+   * @param {string} lang
+   */
+  constructor (cm, lang = 'en_US') {
+    // Verify
+    if (typeof cm !== 'function' || typeof cm.defineMode !== 'function') {
+      console.log(
+        'CodeMirror Spell Checker: You must provide an instance of CodeMirror via the option `codeMirrorInstance`'
+      )
+      return
+    }
+
+    this.numLoaded = 0
+    this.affLoading = false
+    this.dicLoading = false
+    this.affData = ''
+    this.dicData = ''
+    this.typo = undefined
+
+    this.setupCM.bind(this)(cm, lang)
+  }
+
+  setupCM (cm, lang) {
+    cm.defineMode('spell-checker', config => {
+      // Load AFF/DIC data
+      if (!this.affLoading) {
+        this.affLoading = true
+
+        const xhrAff = new XMLHttpRequest()
+        xhrAff.open('GET', dictionaryDownloadUrls[lang].aff, true)
+        xhrAff.onload = () => {
+          if (xhrAff.readyState === 4 && xhrAff.status === 200) {
+            this.affData = xhrAff.responseText
+            this.numLoaded++
+
+            if (this.numLoaded === 2) {
+              this.typo = new Typo(lang, this.affData, this.dicData, { platform: 'any' })
+            }
+          }
+        }
+        xhrAff.send(null)
+      }
+
+      if (!this.dicLoading) {
+        this.dicLoading = true
+        const xhrDic = new XMLHttpRequest()
+        xhrDic.open('GET', dictionaryDownloadUrls[lang].dic, true)
+        xhrDic.onload = () => {
+          if (xhrDic.readyState === 4 && xhrDic.status === 200) {
+            this.dicData = xhrDic.responseText
+            this.numLoaded++
+
+            if (this.numLoaded === 2) {
+              this.typo = new Typo(lang, this.affData, this.dicData, { platform: 'any' })
+            }
+          }
+        }
+        xhrDic.send(null)
+      }
+
+      // Define what separates a word
+      const regexWord = '!"#$%&()*+,-./:;<=>?@[\\]^_`{|}~ '
+
+      // Create the overlay and such
+      const overlay = {
+        token: (stream) => {
+          let ch = stream.peek()
+          let word = ''
+
+          if (regexWord.includes(ch)) {
+            stream.next()
+            return null
+          }
+
+          while ((ch = stream.peek()) != null && !regexWord.includes(ch)) {
+            word += ch
+            stream.next()
+          }
+
+          if (this.typo && !this.typo.check(word)) {
+            return 'spell-error' // CSS class: cm-spell-error
+          }
+
+          return null
+        }
+      }
+
+      const mode = cm.getMode(config, config.backdrop || 'text/plain')
+
+      return cm.overlayMode(mode, overlay, true)
+    })
+  }
+}
+
+// Export
+export default CodeMirrorSpellChecker

webpack.common.js

@@ -203,7 +203,6 @@ module.exports = {
       'script-loader!codemirror',
       'script-loader!inlineAttachment',
       'script-loader!jqueryTextcomplete',
-      'script-loader!codemirrorSpellChecker',
       'script-loader!codemirrorInlineAttachment',
       'script-loader!ot',
       'flowchart.js',
@@ -259,7 +258,6 @@ module.exports = {
       'script-loader!codemirror',
       'script-loader!inlineAttachment',
       'script-loader!jqueryTextcomplete',
-      'script-loader!codemirrorSpellChecker',
       'script-loader!codemirrorInlineAttachment',
       'script-loader!ot',
       'flowchart.js',
@@ -371,7 +369,6 @@ module.exports = {
       codemirror: path.join(__dirname, 'node_modules/@hackmd/codemirror/codemirror.min.js'),
       inlineAttachment: path.join(__dirname, 'public/vendor/inlineAttachment/inline-attachment.js'),
       jqueryTextcomplete: path.join(__dirname, 'public/vendor/jquery-textcomplete/jquery.textcomplete.js'),
-      codemirrorSpellChecker: path.join(__dirname, 'public/vendor/codemirror-spell-checker/spell-checker.min.js'),
       codemirrorInlineAttachment: path.join(__dirname, 'public/vendor/inlineAttachment/codemirror.inline-attachment.js'),
       ot: path.join(__dirname, 'public/vendor/ot/ot.min.js'),
       mermaid: path.join(__dirname, 'node_modules/mermaid/dist/mermaid.min.js'),

yarn.lock

@@ -12495,6 +12495,11 @@ typedarray@^0.0.6, typedarray@~0.0.5:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
+typo-js@^1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/typo-js/-/typo-js-1.0.3.tgz#54d8ebc7949f1a7810908b6002c6841526c99d5a"
+  integrity sha1-VNjrx5SfGngQkItgAsaEFSbJnVo=
+
 uc.micro@^1.0.1, uc.micro@^1.0.5:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/uc.micro/-/uc.micro-1.0.6.tgz#9c411a802a409a91fc6cf74081baba34b24499ac"