Improve copy/paste

* In browsers that support it, we now tell it to copy exactly what was selected
  in the DOM, and not to add extra gunk which browsers do to preserve exact
  styling if pasted into another document.
* Don't use the clipboard APIs with MS Edge, since it only supports plain text.
  If we let it fallback to the browser implementation it will insert HTML.

build/squire-raw.js

@@ -28,7 +28,8 @@ var isMac = /Mac OS X/.test( ua );
 var isGecko = /Gecko\//.test( ua );
 var isIElt11 = /Trident\/[456]\./.test( ua );
 var isPresto = !!win.opera;
-var isWebKit = /WebKit\//.test( ua );
+var isEdge = /Edge\//.test( ua );
+var isWebKit = !isEdge && /WebKit\//.test( ua );
 
 var ctrlKey = isMac ? 'meta-' : 'ctrl-';
 
@@ -777,7 +778,7 @@ var deleteContentsOfRange = function ( range ) {
             ( isInline( endBlock ) || isBlock( endBlock ) );
 
     // Remove selected range
-    extractContentsOfRange( range );
+    var frag = extractContentsOfRange( range );
 
     // Move boundaries back down tree so that they are inside the blocks.
     // If we don't do this, the range may be collapsed to a point between
@@ -807,6 +808,7 @@ var deleteContentsOfRange = function ( range ) {
     } else {
         range.collapse( false );
     }
+    return frag;
 };
 
 // ---
@@ -1979,21 +1981,48 @@ var cleanupBRs = function ( root ) {
     }
 };
 
-var onCut = function () {
-    // Save undo checkpoint
+var onCut = function ( event ) {
+    var clipboardData = event.clipboardData;
     var range = this.getSelection();
+    var node = this.createElement( 'div' );
+    var body = this._body;
     var self = this;
+
+    // Save undo checkpoint
     this._recordUndoState( range );
+
+    // Edge only seems to support setting plain text as of 2016-03-11.
+    if ( !isEdge && clipboardData ) {
+        moveRangeBoundariesUpTree( range, body );
+        node.appendChild( deleteContentsOfRange( range, body ) );
+        clipboardData.setData( 'text/html', node.innerHTML );
+        event.preventDefault();
+    } else {
+        setTimeout( function () {
+            try {
+                // If all content removed, ensure div at start of body.
+                self._ensureBottomLine();
+            } catch ( error ) {
+                self.didError( error );
+            }
+        }, 0 );
+    }
+
     this._getRangeAndRemoveBookmark( range );
     this.setSelection( range );
-    setTimeout( function () {
-        try {
-            // If all content removed, ensure div at start of body.
-            self._ensureBottomLine();
-        } catch ( error ) {
-            self.didError( error );
-        }
-    }, 0 );
+};
+
+var onCopy = function ( event ) {
+    var clipboardData = event.clipboardData;
+    var range = this.getSelection();
+    var node = this.createElement( 'div' );
+
+    // Edge only seems to support setting plain text as of 2016-03-11.
+    if ( !isEdge && clipboardData ) {
+        node.appendChild( range.cloneContents() );
+        clipboardData.setData( 'text/html', node.innerHTML );
+        event.preventDefault();
+    }
 };
 
 var onPaste = function ( event ) {
@@ -2009,7 +2038,8 @@ var onPaste = function ( event ) {
     // ---------------------------------
     // https://html.spec.whatwg.org/multipage/interaction.html
 
-    if ( items ) {
+    // Edge only provides access to plain text as of 2016-03-11.
+    if ( !isEdge && items ) {
         event.preventDefault();
         l = items.length;
         while ( l-- ) {
@@ -2066,7 +2096,7 @@ var onPaste = function ( event ) {
     // let the browser insert the content. I've filed
     // https://bugzilla.mozilla.org/show_bug.cgi?id=1254028
     types = clipboardData && clipboardData.types;
-    if ( types && (
+    if ( !isEdge && types && (
             indexOf.call( types, 'text/html' ) > -1 || (
                 !isGecko &&
                 indexOf.call( types, 'text/plain' ) > -1 &&
@@ -2084,8 +2114,8 @@ var onPaste = function ( event ) {
         return;
     }
 
-    // No interface :(
-    // ---------------
+    // No interface. Includes all versions of IE :(
+    // --------------------------------------------
 
     this._awaitingPaste = true;
 
@@ -2232,6 +2262,7 @@ function Squire ( doc, config ) {
     // again before our after paste function is called.
     this._awaitingPaste = false;
     this.addEventListener( isIElt11 ? 'beforecut' : 'cut', onCut );
+    this.addEventListener( 'copy', onCopy );
     this.addEventListener( isIElt11 ? 'beforepaste' : 'paste', onPaste );
 
     // Opera does not fire keydown repeatedly.

source/Clipboard.js

@@ -1,20 +1,47 @@
 /*jshint strict:false, undef:false, unused:false */
 
-var onCut = function () {
-    // Save undo checkpoint
+var onCut = function ( event ) {
+    var clipboardData = event.clipboardData;
     var range = this.getSelection();
+    var node = this.createElement( 'div' );
+    var body = this._body;
     var self = this;
+
+    // Save undo checkpoint
     this._recordUndoState( range );
+
+    // Edge only seems to support setting plain text as of 2016-03-11.
+    if ( !isEdge && clipboardData ) {
+        moveRangeBoundariesUpTree( range, body );
+        node.appendChild( deleteContentsOfRange( range, body ) );
+        clipboardData.setData( 'text/html', node.innerHTML );
+        event.preventDefault();
+    } else {
+        setTimeout( function () {
+            try {
+                // If all content removed, ensure div at start of body.
+                self._ensureBottomLine();
+            } catch ( error ) {
+                self.didError( error );
+            }
+        }, 0 );
+    }
+
     this._getRangeAndRemoveBookmark( range );
     this.setSelection( range );
-    setTimeout( function () {
-        try {
-            // If all content removed, ensure div at start of body.
-            self._ensureBottomLine();
-        } catch ( error ) {
-            self.didError( error );
-        }
-    }, 0 );
+};
+
+var onCopy = function ( event ) {
+    var clipboardData = event.clipboardData;
+    var range = this.getSelection();
+    var node = this.createElement( 'div' );
+
+    // Edge only seems to support setting plain text as of 2016-03-11.
+    if ( !isEdge && clipboardData ) {
+        node.appendChild( range.cloneContents() );
+        clipboardData.setData( 'text/html', node.innerHTML );
+        event.preventDefault();
+    }
 };
 
 var onPaste = function ( event ) {
@@ -30,7 +57,8 @@ var onPaste = function ( event ) {
     // ---------------------------------
     // https://html.spec.whatwg.org/multipage/interaction.html
 
-    if ( items ) {
+    // Edge only provides access to plain text as of 2016-03-11.
+    if ( !isEdge && items ) {
         event.preventDefault();
         l = items.length;
         while ( l-- ) {
@@ -87,7 +115,7 @@ var onPaste = function ( event ) {
     // let the browser insert the content. I've filed
     // https://bugzilla.mozilla.org/show_bug.cgi?id=1254028
     types = clipboardData && clipboardData.types;
-    if ( types && (
+    if ( !isEdge && types && (
             indexOf.call( types, 'text/html' ) > -1 || (
                 !isGecko &&
                 indexOf.call( types, 'text/plain' ) > -1 &&
@@ -105,8 +133,8 @@ var onPaste = function ( event ) {
         return;
     }
 
-    // No interface :(
-    // ---------------
+    // No interface. Includes all versions of IE :(
+    // --------------------------------------------
 
     this._awaitingPaste = true;
 

source/Constants.js

@@ -24,7 +24,8 @@ var isMac = /Mac OS X/.test( ua );
 var isGecko = /Gecko\//.test( ua );
 var isIElt11 = /Trident\/[456]\./.test( ua );
 var isPresto = !!win.opera;
-var isWebKit = /WebKit\//.test( ua );
+var isEdge = /Edge\//.test( ua );
+var isWebKit = !isEdge && /WebKit\//.test( ua );
 
 var ctrlKey = isMac ? 'meta-' : 'ctrl-';
 

source/Editor.js

@@ -82,6 +82,7 @@ function Squire ( doc, config ) {
     // again before our after paste function is called.
     this._awaitingPaste = false;
     this.addEventListener( isIElt11 ? 'beforecut' : 'cut', onCut );
+    this.addEventListener( 'copy', onCopy );
     this.addEventListener( isIElt11 ? 'beforepaste' : 'paste', onPaste );
 
     // Opera does not fire keydown repeatedly.

source/Range.js

@@ -145,7 +145,7 @@ var deleteContentsOfRange = function ( range ) {
             ( isInline( endBlock ) || isBlock( endBlock ) );
 
     // Remove selected range
-    extractContentsOfRange( range );
+    var frag = extractContentsOfRange( range );
 
     // Move boundaries back down tree so that they are inside the blocks.
     // If we don't do this, the range may be collapsed to a point between
@@ -175,6 +175,7 @@ var deleteContentsOfRange = function ( range ) {
     } else {
         range.collapse( false );
     }
+    return frag;
 };
 
 // ---