Implement text expansions

  * Trigger is "space"
  * "*" -> ul>li
  * "1" and "1." -> ol>li
  * "##" -> h2
  * "###" -> h3

fixes #87

src/js/editor/editor.js

@@ -43,14 +43,18 @@ import mixin from '../utils/mixin';
 import EventListenerMixin from '../utils/event-listener';
 import Cursor from '../utils/cursor';
 import PostNodeBuilder from '../models/post-node-builder';
+import {
+  DEFAULT_TEXT_EXPANSIONS,
+  findExpansion,
+  validateExpansion
+} from './text-expansions';
 
 export const EDITOR_ELEMENT_CLASS_NAME = 'ck-editor';
 
 const defaults = {
   placeholder: 'Write here...',
   spellcheck: true,
   autofocus: true,
-  post: null,
   // FIXME PhantomJS has 'ontouchstart' in window,
   // causing the stickyToolbar to accidentally be auto-activated
   // in tests
@@ -99,8 +103,8 @@ function bindSelectionEvent(editor) {
    */
 
   const toggleSelection = () => {
-    return editor.cursor.hasSelection() ? editor.hasSelection() :
-                                          editor.hasNoSelection();
+    return editor.cursor.hasSelection() ? editor.reportSelection() :
+                                          editor.reportNoSelection();
   };
 
   // mouseup will not properly report a selection until the next tick, so add a timeout:
@@ -122,6 +126,10 @@ function bindKeyListeners(editor) {
     }
   });
 
+  editor.addEventListener(editor.element, 'keydown', (event) => {
+    editor.handleExpansion(event);
+  });
+
   editor.addEventListener(document, 'keydown', (event) => {
     if (!editor.isEditable) {
       return;
@@ -199,8 +207,6 @@ class Editor {
     this._views = [];
     this.isEditable = null;
 
-    this.builder = new PostNodeBuilder();
-
     this._didUpdatePostCallbacks = [];
     this._willRenderCallbacks = [];
     this._didRenderCallbacks = [];
@@ -210,34 +216,44 @@ class Editor {
 
     this.cards.push(ImageCard);
 
+    DEFAULT_TEXT_EXPANSIONS.forEach(e => this.registerExpansion(e));
+
     this._parser   = new PostParser(this.builder);
     this._renderer = new Renderer(this, this.cards, this.unknownCardHandler, this.cardOptions);
 
-    if (this.mobiledoc) {
-      this.post = new MobiledocParser(this.builder).parse(this.mobiledoc);
-    } else if (this.html) {
-      if (typeof this.html === 'string') {
-        this.html = parseHTML(this.html);
-      }
-      this.post = new DOMParser(this.builder).parse(this.html);
-    } else {
-      this.post = this.builder.createBlankPost();
-    }
-
+    this.post = this.loadPost();
     this._renderTree = this.prepareRenderTree(this.post);
   }
 
   addView(view) {
     this._views.push(view);
   }
 
+  get builder() {
+    if (!this._builder) { this._builder = new PostNodeBuilder(); }
+    return this._builder;
+  }
+
   prepareRenderTree(post) {
     let renderTree = new RenderTree();
     let node = renderTree.buildRenderNode(post);
     renderTree.node = node;
     return renderTree;
   }
 
+  loadPost() {
+    if (this.mobiledoc) {
+      return new MobiledocParser(this.builder).parse(this.mobiledoc);
+    } else if (this.html) {
+      if (typeof this.html === 'string') {
+        this.html = parseHTML(this.html);
+      }
+      return new DOMParser(this.builder).parse(this.html);
+    } else {
+      return this.builder.createBlankPost();
+    }
+  }
+
   rerender() {
     let postRenderNode = this.post.renderNode;
 
@@ -305,6 +321,26 @@ class Editor {
     }
   }
 
+  get expansions() {
+    if (!this._expansions) { this._expansions = []; }
+    return this._expansions;
+  }
+
+  registerExpansion(expansion) {
+    if (!validateExpansion(expansion)) {
+      throw new Error('Expansion is not valid');
+    }
+    this.expansions.push(expansion);
+  }
+
+  handleExpansion(event) {
+    const expansion = findExpansion(this.expansions, event, this);
+    if (expansion) {
+      event.preventDefault();
+      expansion.run(this);
+    }
+  }
+
   handleDeletion(event) {
     event.preventDefault();
 
@@ -346,7 +382,7 @@ class Editor {
     this.cursor.moveToSection(cursorSection);
   }
 
-  hasSelection() {
+  reportSelection() {
     if (!this._hasSelection) {
       this.trigger('selection');
     } else {
@@ -355,7 +391,7 @@ class Editor {
     this._hasSelection = true;
   }
 
-  hasNoSelection() {
+  reportNoSelection() {
     if (this._hasSelection) {
       this.trigger('selectionEnded');
     }
@@ -366,7 +402,7 @@ class Editor {
     if (this._hasSelection) {
       // FIXME perhaps restore cursor position to end of the selection?
       this.cursor.clearSelection();
-      this.hasNoSelection();
+      this.reportNoSelection();
     }
   }
 
@@ -376,12 +412,12 @@ class Editor {
 
   selectSections(sections) {
     this.cursor.selectSections(sections);
-    this.hasSelection();
+    this.reportSelection();
   }
 
   selectMarkers(markers) {
     this.cursor.selectMarkers(markers);
-    this.hasSelection();
+    this.reportSelection();
   }
 
   get cursor() {
@@ -571,8 +607,8 @@ class Editor {
    * @public
    */
   run(callback) {
-    let postEditor = new PostEditor(this);
-    let result = callback(postEditor);
+    const postEditor = new PostEditor(this);
+    const result = callback(postEditor);
     runCallbacks(this._didUpdatePostCallbacks, [postEditor]);
     postEditor.complete();
     return result;

src/js/editor/text-expansions.js

@@ -0,0 +1,92 @@
+import Keycodes from '../utils/keycodes';
+import Key from '../utils/key';
+import { detect } from '../utils/array-utils';
+import { MARKUP_SECTION_TYPE } from '../models/markup-section';
+
+const { SPACE } = Keycodes;
+
+function replaceWithListSection(editor, listTagName) {
+  const {head: {section}} = editor.cursor.offsets;
+
+  const newSection = editor.run(postEditor => {
+    const {builder} = postEditor;
+    const listItem = builder.createListItem();
+    const listSection = builder.createListSection(listTagName, [listItem]);
+
+    postEditor.replaceSection(section, listSection);
+    return listItem;
+  });
+
+  editor.cursor.moveToSection(newSection);
+}
+
+function replaceWithHeaderSection(editor, headingTagName) {
+  const {head: {section}} = editor.cursor.offsets;
+
+  const newSection = editor.run(postEditor => {
+    const {builder} = postEditor;
+    const newSection = builder.createMarkupSection(headingTagName);
+    postEditor.replaceSection(section, newSection);
+    return newSection;
+  });
+
+  editor.cursor.moveToSection(newSection);
+}
+
+export function validateExpansion(expansion) {
+  return !!expansion.trigger && !!expansion.text && !!expansion.run;
+}
+
+export const DEFAULT_TEXT_EXPANSIONS = [
+  {
+    trigger: SPACE,
+    text: '*',
+    run: (editor) => {
+      replaceWithListSection(editor, 'ul');
+    }
+  },
+  {
+    trigger: SPACE,
+    text: '1',
+    run: (editor) => {
+      replaceWithListSection(editor, 'ol');
+    }
+  },
+  {
+    trigger: SPACE,
+    text: '1.',
+    run: (editor) => {
+      replaceWithListSection(editor, 'ol');
+    }
+  },
+  {
+    trigger: SPACE,
+    text: '##',
+    run: (editor) => {
+      replaceWithHeaderSection(editor, 'h2');
+    }
+  },
+  {
+    trigger: SPACE,
+    text: '###',
+    run: (editor) => {
+      replaceWithHeaderSection(editor, 'h3');
+    }
+  }
+];
+
+export function findExpansion(expansions, keyEvent, editor) {
+  const key = Key.fromEvent(keyEvent);
+  if (!key.isPrintable()) { return; }
+
+  const {head:{section, offset}} = editor.cursor.offsets;
+  if (section.type !== MARKUP_SECTION_TYPE) { return; }
+
+  // FIXME this is potentially expensive to calculate and might be better
+  // perf to first find expansions matching the trigger and only if matches
+  // are found then calculating the _text
+  const _text = section.textUntil(offset);
+  return detect(
+    expansions,
+    ({trigger, text}) => key.keyCode === trigger && _text === text);
+}

src/js/models/_markerable.js

@@ -116,6 +116,10 @@ export default class Markerable extends LinkedItem {
     return {marker:currentMarker, offset:currentOffset};
   }
 
+  textUntil(offset) {
+    return this.text.slice(0, offset);
+  }
+
   get text() {
     return reduce(this.markers, (prev, m) => prev + m.value, '');
   }

src/js/renderers/editor-dom.js

@@ -12,7 +12,7 @@ import { startsWith, endsWith } from '../utils/string-utils';
 import { addClassName } from '../utils/dom-utils';
 
 export const NO_BREAK_SPACE = '\u00A0';
-const SPACE = ' ';
+export const SPACE = ' ';
 
 function createElementFromMarkup(doc, markup) {
   var element = doc.createElement(markup.tagName);

src/js/utils/event-listener.js

@@ -1,3 +1,5 @@
+import { filter } from './array-utils';
+
 export default class EventListenerMixin {
   addEventListener(context, eventName, listener) {
     if (!this._eventListeners) { this._eventListeners = []; }
@@ -11,4 +13,18 @@ export default class EventListenerMixin {
       context.removeEventListener(...args);
     });
   }
+
+  // This is primarily useful for programmatically simulating events on the
+  // editor from the tests.
+  triggerEvent(context, eventName, event) {
+    let matches = filter(
+      this._eventListeners,
+      ([_context, _eventName]) => {
+        return context === _context && eventName === _eventName;
+      }
+    );
+    matches.forEach(([context, eventName, listener]) => {
+      listener.call(context, event);
+    });
+  }
 }

tests/acceptance/editor-commands-test.js

@@ -72,7 +72,7 @@ test('highlight text, click "bold", type more text, re-select text, bold button
     assert.equal(textNode.textContent, 'IS A', 'precond - correct node');
 
     Helpers.dom.moveCursorTo(textNode, 'IS'.length);
-    Helpers.dom.insertText('X');
+    Helpers.dom.insertText(editor, 'X');
 
     assert.hasElement('strong:contains(ISX A)', 'adds text to bold');
 
@@ -233,14 +233,14 @@ Helpers.skipInPhantom('highlight text, click "link" button shows input for URL,
     setTimeout(() => {
       assert.hasElement(`#editor a[href="${url}"]:contains(${selectedText})`);
 
-      Helpers.dom.insertText('X');
+      Helpers.dom.insertText(editor, 'X');
 
       assert.hasElement(`#editor p:contains(${selectedText}X)`,
                         'inserts text after selected text');
       assert.hasNoElement(`#editor a:contains(${selectedText}X)`,
                         'inserted text does not extend "a" tag');
 
-      Helpers.dom.insertText('X');
+      Helpers.dom.insertText(editor, 'X');
       assert.hasElement(`#editor p:contains(${selectedText}XX)`,
                         'inserts text after selected text again');