less duplicate code

src/Types/YText/YText.js

@@ -109,14 +109,8 @@ function minimizeAttributeChanges (left, right, currentAttributes, attributes) {
   return [left, right]
 }
 
-function insertText (y, text, parent, left, right, currentAttributes, attributes) {
-  for (let [key] of currentAttributes) {
-    if (attributes.hasOwnProperty(key) === false) {
-      attributes[key] = null
-    }
-  }
-  [left, right] = minimizeAttributeChanges(left, right, currentAttributes, attributes)
-  let negatedAttributes = new Map()
+function insertAttributes (y, parent, left, right, attributes, currentAttributes) {
+  const negatedAttributes = new Map()
   // insert format-start items
   for (let key in attributes) {
     const val = attributes[key]
@@ -131,6 +125,17 @@ function insertText (y, text, parent, left, right, currentAttributes, attributes
       left = format
     }
   }
+  return negatedAttributes
+}
+
+function insertText (y, text, parent, left, right, currentAttributes, attributes) {
+  for (let [key] of currentAttributes) {
+    if (attributes.hasOwnProperty(key) === false) {
+      attributes[key] = null
+    }
+  }
+  [left, right] = minimizeAttributeChanges(left, right, currentAttributes, attributes)
+  const negatedAttributes = insertAttributes(y, parent, left, right, attributes, currentAttributes)
   // insert content
   let item
   if (text.constructor === String) {
@@ -147,21 +152,7 @@ function insertText (y, text, parent, left, right, currentAttributes, attributes
 
 function formatText (y, length, parent, left, right, currentAttributes, attributes) {
   [left, right] = minimizeAttributeChanges(left, right, currentAttributes, attributes)
-  let negatedAttributes = new Map()
-  // insert format-start items
-  for (let key in attributes) {
-    const val = attributes[key]
-    const currentVal = currentAttributes.get(key)
-    if (currentVal !== val) {
-      // save negated attribute (set null if currentVal undefined)
-      negatedAttributes.set(key, currentVal || null)
-      let format = new ItemFormat()
-      format.key = key
-      format.value = val
-      integrateItem(format, parent, y, left, right)
-      left = format
-    }
-  }
+  const negatedAttributes = insertAttributes(y, parent, left, right, attributes, currentAttributes)
   // iterate until first non-format or null is found
   // delete all formats with attributes[format.key] != null
   while (length > 0 && right !== null) {

src/Util/Tree.js

@@ -1,4 +1,17 @@
 
+function rotate (tree, parent, newParent, n) {
+  if (parent === null) {
+    tree.root = newParent
+    newParent._parent = null
+  } else if (parent.left === n) {
+    parent.left = newParent
+  } else if (parent.right === n) {
+    parent.right = newParent
+  } else {
+    throw new Error('The elements are wrongly connected!')
+  }
+}
+
 class N {
   // A created node is always red!
   constructor (val) {
@@ -41,21 +54,12 @@ class N {
     this._right = n
   }
   rotateLeft (tree) {
-    var parent = this.parent
-    var newParent = this.right
-    var newRight = this.right.left
+    const parent = this.parent
+    const newParent = this.right
+    const newRight = this.right.left
     newParent.left = this
     this.right = newRight
-    if (parent === null) {
-      tree.root = newParent
-      newParent._parent = null
-    } else if (parent.left === this) {
-      parent.left = newParent
-    } else if (parent.right === this) {
-      parent.right = newParent
-    } else {
-      throw new Error('The elements are wrongly connected!')
-    }
+    rotate(tree, parent, newParent, this)
   }
   next () {
     if (this.right !== null) {
@@ -90,21 +94,12 @@ class N {
     }
   }
   rotateRight (tree) {
-    var parent = this.parent
-    var newParent = this.left
-    var newLeft = this.left.right
+    const parent = this.parent
+    const newParent = this.left
+    const newLeft = this.left.right
     newParent.right = this
     this.left = newLeft
-    if (parent === null) {
-      tree.root = newParent
-      newParent._parent = null
-    } else if (parent.left === this) {
-      parent.left = newParent
-    } else if (parent.right === this) {
-      parent.right = newParent
-    } else {
-      throw new Error('The elements are wrongly connected!')
-    }
+    rotate(tree, parent, newParent, this)
   }
   getUncle () {
     // we can assume that grandparent exists when this is called!

src/Util/YEvent.js

@@ -31,24 +31,6 @@ export default class YEvent {
    *   type === event.target // => true
    */
   get path () {
-    const path = []
-    let type = this.target
-    const y = type._y
-    while (type !== this.currentTarget && type !== y) {
-      let parent = type._parent
-      if (type._parentSub !== null) {
-        path.unshift(type._parentSub)
-      } else {
-        // parent is array-ish
-        for (let [i, child] of parent) {
-          if (child === type) {
-            path.unshift(i)
-            break
-          }
-        }
-      }
-      type = parent
-    }
-    return path
+    return this.currentTarget.getPathTo(this.target)
   }
 }