Add isSupportedEnvironment virtual member

CHANGES.md

@@ -39,6 +39,7 @@ API Changes:
 * [#2962](https://github.com/ckeditor/ckeditor-dev/issues/2962): Added the [`CKEDITOR.tools.promise`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_tools_promise.html) class.
 * [#2924](https://github.com/ckeditor/ckeditor-dev/issues/2924): Added the [`CKEDITOR.tools.style.border`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_tools_style_border.html) object wrapping CSS border style helpers under single type.
 * [#2495](https://github.com/ckeditor/ckeditor-dev/issues/2495): [Table Selection](https://ckeditor.com/cke4/addon/tableselection) plugin can be now disabled for the given table by the `data-cke-tableselection-ignored` attribute.
+* [#2692](https://github.com/ckeditor/ckeditor-dev/issues/2692): Plugins can now expose information about supported environment by implementing [`pluginDefinition.isSupportedEnvironment`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_pluginDefinition.html#method-isSupportedEnvironment) method.
 
 Other Changes:
 

core/plugindefinition.js

@@ -189,3 +189,29 @@
  *
  * @property {String} [icons]
  */
+
+/**
+ * A function which should be implemented if a plugin is not supported on every
+ * available environment according to
+ * [Browser Compatibility](https://ckeditor.com/docs/ckeditor4/latest/guide/dev_browsers.html)
+ * or specific editor configuration.
+ *
+ * This function won't be called by the plugin loader itself and it's not required for a proper
+ * plugin initialization. However, it's recommended to implement the function if a plugin
+ * has environment requirements. This information may be important for related features
+ * and testing environment.
+ *
+ * ```javascript
+ * CKEDITOR.plugins.add( 'sample', {
+ *		isSupportedEnvironment: function( editor ) {
+ *			// Plugin supported only on modern browsers.
+ *			return !CKEDITOR.env.ie || CKEDITOR.env.edge;
+ *		}
+ * } );
+ * ```
+ *
+ * @since 4.12.0
+ * @method isSupportedEnvironment
+ * @param {CKEDITOR.editor} editor
+ * @returns {Boolean} Information if the plugin is supported in the current environment.
+ */

core/plugins.js

@@ -47,6 +47,12 @@ CKEDITOR.plugins.load = CKEDITOR.tools.override( CKEDITOR.plugins.load, function
 										'.png' );
 								}
 							}
+
+							// Plugin is supported by default (#2692).
+							plugin.isSupportedEnvironment = plugin.isSupportedEnvironment || function() {
+								return true;
+							};
+
 							initialized[ pluginName ] = 1;
 						}
 

core/selection.js

@@ -2020,9 +2020,8 @@
 
 			// Handle special case - fake selection of table cells.
 			if ( editor && editor.plugins.tableselection &&
-				CKEDITOR.plugins.tableselection.isSupportedEnvironment &&
-				isTableSelection( ranges ) &&
-				!isSelectingTable &&
+				editor.plugins.tableselection.isSupportedEnvironment() &&
+				isTableSelection( ranges ) && !isSelectingTable &&
 				!ranges[ 0 ]._getTableElement( { table: 1 } ).hasAttribute( 'data-cke-tableselection-ignored' )
 			) {
 				performFakeTableSelection.call( this, ranges );

plugins/autocomplete/plugin.js

@@ -11,6 +11,9 @@
 		requires: 'textwatcher',
 		onLoad: function() {
 			CKEDITOR.document.appendStyleSheet( this.path + 'skins/default.css' );
+		},
+		isSupportedEnvironment: function() {
+			return !CKEDITOR.env.ie || CKEDITOR.env.version > 8;
 		}
 	} );
 

plugins/balloontoolbar/plugin.js

@@ -614,6 +614,10 @@
 	CKEDITOR.plugins.add( 'balloontoolbar', {
 		requires: 'balloonpanel',
 
+		isSupportedEnvironment: function() {
+			return !CKEDITOR.env.ie || CKEDITOR.env.version > 8;
+		},
+
 		beforeInit: function( editor ) {
 			if ( !cssLoaded ) {
 				// Load fallback styles.

plugins/codesnippet/plugin.js

@@ -10,14 +10,16 @@
 'use strict';
 
 ( function() {
-	var isBrowserSupported = !CKEDITOR.env.ie || CKEDITOR.env.version > 8;
-
 	CKEDITOR.plugins.add( 'codesnippet', {
 		requires: 'widget,dialog',
 		lang: 'ar,az,bg,ca,cs,da,de,de-ch,el,en,en-au,en-gb,eo,es,es-mx,et,eu,fa,fi,fr,fr-ca,gl,he,hr,hu,id,it,ja,km,ko,ku,lt,lv,nb,nl,no,oc,pl,pt,pt-br,ro,ru,sk,sl,sq,sr,sr-latn,sv,th,tr,tt,ug,uk,vi,zh,zh-cn', // %REMOVE_LINE_CORE%
 		icons: 'codesnippet', // %REMOVE_LINE_CORE%
 		hidpi: true, // %REMOVE_LINE_CORE%
 
+		isSupportedEnvironment: function() {
+			return !CKEDITOR.env.ie || CKEDITOR.env.version > 8;
+		},
+
 		beforeInit: function( editor ) {
 			editor._.codesnippet = {};
 
@@ -105,7 +107,7 @@
 					init: function( callback ) {
 						var that = this;
 
-						if ( isBrowserSupported ) {
+						if ( editor.plugins.codesnippet.isSupportedEnvironment() ) {
 							CKEDITOR.scriptLoader.load( path + 'lib/highlight/highlight.pack.js', function() {
 								that.hljs = window.hljs;
 								callback();
@@ -313,7 +315,7 @@
 					callback = function( formatted ) {
 						// IE8 (not supported browser) have issue with new line chars, when using innerHTML.
 						// It will simply strip it.
-						that.parts.code.setHtml( isBrowserSupported ?
+						that.parts.code.setHtml( editor.plugins.codesnippet.isSupportedEnvironment() ?
 							formatted : formatted.replace( newLineRegex, '<br>' ) );
 					};
 

plugins/easyimage/plugin.js

@@ -494,10 +494,6 @@
 		}
 	};
 
-	function isSupportedBrowser() {
-		return !CKEDITOR.env.ie || CKEDITOR.env.version >= 11;
-	}
-
 	function addUploadButtonToToolbar( editor ) {
 		editor.ui.addButton( BUTTON_PREFIX + 'Upload', {
 			label: editor.lang.easyimage.commands.upload,
@@ -535,8 +531,12 @@
 			CKEDITOR.dialog.add( 'easyimageAlt', this.path + 'dialogs/easyimagealt.js' );
 		},
 
+		isSupportedEnvironment: function() {
+			return !CKEDITOR.env.ie || CKEDITOR.env.version >= 11;
+		},
+
 		init: function( editor ) {
-			if ( !isSupportedBrowser() ) {
+			if ( !this.isSupportedEnvironment() ) {
 				return;
 			}
 			loadStyles( editor, this );
@@ -545,7 +545,7 @@
 		// Widget must be registered after init in case that link plugin is dynamically loaded e.g. via
 		// `config.extraPlugins`.
 		afterInit: function( editor ) {
-			if ( !isSupportedBrowser() ) {
+			if ( !this.isSupportedEnvironment() ) {
 				return;
 			}
 			var styles = getStylesForEditor( editor );

plugins/emoji/plugin.js

@@ -549,8 +549,12 @@
 		icons: 'emojipanel',
 		hidpi: true,
 
+		isSupportedEnvironment: function() {
+			return !CKEDITOR.env.ie || CKEDITOR.env.version >= 11;
+		},
+
 		beforeInit: function() {
-			if ( CKEDITOR.env.ie && CKEDITOR.env.version < 11 ) {
+			if ( !this.isSupportedEnvironment() ) {
 				return;
 			}
 			if ( !stylesLoaded ) {
@@ -560,7 +564,7 @@
 		},
 
 		init: function( editor ) {
-			if ( CKEDITOR.env.ie && CKEDITOR.env.version < 11 ) {
+			if ( !this.isSupportedEnvironment() ) {
 				return;
 			}
 

plugins/mathjax/plugin.js

@@ -18,6 +18,10 @@
 		icons: 'mathjax',
 		hidpi: true, // %REMOVE_LINE_CORE%
 
+		isSupportedEnvironment: function() {
+			return !CKEDITOR.env.ie || CKEDITOR.env.version > 8;
+		},
+
 		init: function( editor ) {
 			var cls = editor.config.mathJaxClass || 'math-tex';
 

plugins/mentions/plugin.js

@@ -26,6 +26,9 @@
 					self.instances.push( new Mentions( editor, config ) );
 				} );
 			} );
+		},
+		isSupportedEnvironment: function( editor ) {
+			return editor.plugins.autocomplete.isSupportedEnvironment( editor );
 		}
 	} );
 

plugins/tableselection/plugin.js

@@ -1149,20 +1149,16 @@
 			var editable = editor.editable();
 			editable.attachListener( editable, 'keydown', getTableOnKeyDownListener( editor ), null, null, -1 );
 			editable.attachListener( editable, 'keypress', tableKeyPressListener, null, null, -1 );
-		},
-
-		/**
-		 * Determines whether table selection is supported in the current environment.
-		 *
-		 * @property {Boolean}
-		 * @private
-		 */
-		isSupportedEnvironment: !( CKEDITOR.env.ie && CKEDITOR.env.version < 11 )
+		}
 	};
 
 	CKEDITOR.plugins.add( 'tableselection', {
 		requires: 'clipboard,tabletools',
 
+		isSupportedEnvironment: function() {
+			return !( CKEDITOR.env.ie && CKEDITOR.env.version < 11 );
+		},
+
 		onLoad: function() {
 			// We can't alias these features earlier, as they could be still not loaded.
 			tabletools = CKEDITOR.plugins.tabletools;
@@ -1176,7 +1172,7 @@
 
 		init: function( editor ) {
 			// Disable unsupported browsers.
-			if ( !CKEDITOR.plugins.tableselection.isSupportedEnvironment ) {
+			if ( !this.isSupportedEnvironment() ) {
 				return;
 			}
 

plugins/uploadfile/plugin.js

@@ -10,7 +10,7 @@
 		requires: 'uploadwidget,link',
 		init: function( editor ) {
 			// Do not execute this paste listener if it will not be possible to upload file.
-			if ( !CKEDITOR.plugins.clipboard.isFileApiSupported ) {
+			if ( !this.isSupportedEnvironment() ) {
 				return;
 			}
 
@@ -37,6 +37,10 @@
 					this.replaceWith( '<a href="' + upload.url + '" target="_blank">' + upload.fileName + '</a>' );
 				}
 			} );
+		},
+
+		isSupportedEnvironment: function() {
+			return CKEDITOR.plugins.clipboard.isFileApiSupported;
 		}
 	} );
 } )();

plugins/uploadimage/plugin.js

@@ -40,9 +40,13 @@
 			);
 		},
 
+		isSupportedEnvironment: function() {
+			return CKEDITOR.plugins.clipboard.isFileApiSupported;
+		},
+
 		init: function( editor ) {
 			// Do not execute this paste listener if it will not be possible to upload file.
-			if ( !CKEDITOR.plugins.clipboard.isFileApiSupported ) {
+			if ( !this.isSupportedEnvironment() ) {
 				return;
 			}
 

plugins/uploadwidget/plugin.js

@@ -15,6 +15,10 @@
 			// because otherwise wrong widget may handle upload placeholder element (e.g. image2 plugin would handle image).
 			// `data-widget` attribute is allowed only in the elements which has also `data-cke-upload-id` attribute.
 			editor.filter.allow( '*[!data-widget,!data-cke-upload-id]' );
+		},
+
+		isSupportedEnvironment: function() {
+			return CKEDITOR.plugins.clipboard.isFileApiSupported;
 		}
 	} );
 

tests/_benderjs/ckeditor/static/tools.js

@@ -59,6 +59,46 @@
 		} );
 
 	bender.tools = {
+		/**
+		 * Ignores test case when the given plugin is not supported on the testing
+		 * environment. Uses {@link CKEDITOR.pluginDefinition#isSupportedEnvironment} to
+		 * verify if plugin is supported.
+		 *
+		 * Works for both manual and unit tests.
+		 *
+		 * @param pluginName pluginName Plugin name to check.
+		 * @param CKEDITOR.editor [editor] Editor instance passsed as an argument
+		 * to the {@link CKEDITOR.pluginDefinition#isSupportedEnvironment} method.
+		 */
+		ignoreUnsupportedEnvironment: function( pluginName, editor ) {
+			if ( editor ) {
+				if ( editor.status === 'ready' ) {
+					ignoreUnsupportedEnvironment();
+				} else {
+					editor.once( 'instanceReady', ignoreUnsupportedEnvironment );
+				}
+				return;
+			}
+
+			if ( CKEDITOR.plugins.registered[ pluginName ] ) {
+				ignoreUnsupportedEnvironment();
+			} else {
+				CKEDITOR.once( pluginName + 'PluginReady', ignoreUnsupportedEnvironment );
+			}
+
+			function ignoreUnsupportedEnvironment() {
+				var plugin = editor ? editor.plugins[ pluginName ] : CKEDITOR.plugins.registered[ pluginName ];
+
+				if ( !plugin.isSupportedEnvironment( editor ) ) {
+					if ( bender.testData.manual ) {
+						bender.ignore();
+					} else {
+						assert.ignore();
+					}
+				}
+			}
+		},
+
 		/**
 		 * Creates an array from an object.
 		 *

tests/core/plugins/plugins.html

@@ -1 +1,2 @@
-<textarea id="errortest">test</textarea>
+<textarea id="errortest">test</textarea>
+<textarea id="env"></textarea>

tests/core/plugins/plugins.js

@@ -103,5 +103,32 @@ bender.test(
 
 		assert.isFalse( result, 'Conflicts not detected.' );
 		assert.isFalse( spy.called );
+	},
+
+	// (#2692)
+	'test supported environment': function() {
+		CKEDITOR.plugins.add( 'envdefault', {} );
+		CKEDITOR.plugins.add( 'envcustom', {
+			isSupportedEnvironment: function() {
+				return false;
+			}
+		} );
+
+		var editor = CKEDITOR.replace( 'env', {
+			plugins: 'wysiwygarea,envdefault,envcustom',
+			on: {
+				instanceReady: function() {
+					resume( function() {
+						assert.isTrue( editor.plugins.envdefault.isSupportedEnvironment(),
+							'Plugin should be supported by default' );
+
+						assert.isFalse( editor.plugins.envcustom.isSupportedEnvironment(),
+							'Plugin should allow for custom isSupportedEnvironment implementation' );
+					} );
+				}
+			}
+		} );
+
+		wait();
 	}
 } );

tests/plugins/autocomplete/autocomplete.js

@@ -33,9 +33,7 @@
 	bender.test( {
 
 		setUp: function() {
-			if ( CKEDITOR.env.ie && CKEDITOR.env.version < 9 ) {
-				assert.ignore();
-			}
+			bender.tools.ignoreUnsupportedEnvironment( 'autocomplete' );
 		},
 
 		'test API exists': function() {

tests/plugins/autocomplete/focus.js

@@ -13,9 +13,7 @@
 
 	bender.test( {
 		setUp: function() {
-			if ( CKEDITOR.env.ie && CKEDITOR.env.version == 8 ) {
-				assert.ignore();
-			}
+			bender.tools.ignoreUnsupportedEnvironment( 'autocomplete' );
 		},
 
 		'test preventDefault is called on mousedown': function() {

tests/plugins/autocomplete/manual/__template__.html

@@ -6,9 +6,7 @@
 
 <script>
 
-	if ( autocompleteUtils.isUnsupportedEnvironment() ) {
-		bender.ignore();
-	}
+	bender.tools.ignoreUnsupportedEnvironment( 'autocomplete' );
 
 	CKEDITOR.replace( 'editor1', {
 		width: 600,