feat(dom): Create mdc-dom package with Element.matches() ponyfill

package.json

@@ -167,6 +167,7 @@
           "checkbox",
           "chips",
           "dialog",
+          "dom",
           "drawer",
           "elevation",
           "fab",
@@ -218,6 +219,7 @@
     "mdc-base",
     "mdc-checkbox",
     "mdc-chips",
+    "mdc-dom",
     "mdc-drawer",
     "mdc-floating-label",
     "mdc-form-field",

packages/material-components-web/index.js

@@ -26,6 +26,7 @@ import * as base from '@material/base/index';
 import * as checkbox from '@material/checkbox/index';
 import * as chips from '@material/chips/index';
 import * as dialog from '@material/dialog/index';
+import * as dom from '@material/dom/index';
 import * as drawer from '@material/drawer/index';
 import * as floatingLabel from '@material/floating-label/index';
 import * as formField from '@material/form-field/index';
@@ -88,6 +89,7 @@ export {
   checkbox,
   chips,
   dialog,
+  dom,
   drawer,
   floatingLabel,
   formField,

packages/material-components-web/package.json

@@ -21,6 +21,7 @@
     "@material/checkbox": "^0.39.1",
     "@material/chips": "^0.39.1",
     "@material/dialog": "^0.39.1",
+    "@material/dom": "^0.0.0",
     "@material/drawer": "^0.39.1",
     "@material/elevation": "^0.39.1",
     "@material/fab": "^0.39.1",

packages/mdc-dom/README.md

@@ -0,0 +1,35 @@
+<!--docs:
+title: "DOM"
+layout: detail
+section: components
+excerpt: "Provides commonly-used utilities for inspecting, traversing, and manipulating the DOM."
+path: /catalog/dom/
+-->
+
+# DOM
+
+MDC DOM provides commonly-used utilities for inspecting, traversing, and manipulating the DOM.
+
+Most of the time, you shouldn't need to depend on `mdc-dom` directly. It is useful however if you'd like to write custom components that follow MDC Web's pattern and elegantly integrate with the MDC Web ecosystem.
+
+## Installation
+
+```
+npm install @material/dom
+```
+
+## Basic Usage
+
+```js
+import * as ponyfill from '@material/dom/ponyfill';
+```
+
+> See [Importing the JS component](../../docs/importing-js.md) for more information on how to import JavaScript.
+
+## Ponyfill Functions
+
+The `ponyfill` module provides the following functions:
+
+Function Signature | Description
+--- | ---
+`matches(element: Element, selector: string) => boolean` | Returns true if the given element matches the given CSS selector.

packages/mdc-dom/index.js

@@ -0,0 +1,26 @@
+/**
+ * @license
+ * Copyright 2016 Google Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+import * as ponyfill from './ponyfill';
+
+export {ponyfill};

packages/mdc-dom/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "@material/dom",
+  "description": "DOM manipulation utilities for Material Components for the web",
+  "version": "0.0.0",
+  "license": "MIT",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/material-components/material-components-web.git"
+  }
+}

packages/mdc-dom/ponyfill.js

@@ -0,0 +1,41 @@
+/**
+ * @license
+ * Copyright 2018 Google Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * @fileoverview A "ponyfill" is a polyfill that doesn't modify the global prototype chain.
+ * This makes ponyfills safer than traditional polyfills, especially for libraries like MDC.
+ */
+
+/**
+ * @param {!Element} element
+ * @param {string} selector
+ * @return {boolean}
+ */
+function matches(element, selector) {
+  const nativeMatches = element.matches
+    || element.webkitMatchesSelector
+    || element.msMatchesSelector;
+  return nativeMatches.call(element, selector);
+}
+
+export {matches};

scripts/check-pkg-for-release.js

@@ -60,6 +60,7 @@ const NOT_MCW_DEP = [
 const NOT_AUTOINIT = [
   'auto-init',
   'base',
+  'dom',
   'selection-control',
   'tab', // Only makes sense in context of tab-bar
   'tab-indicator', // Only makes sense in context of tab-bar

scripts/webpack/js-bundle-factory.js

@@ -137,6 +137,7 @@ class JsBundleFactory {
         checkbox: getAbsolutePath('/packages/mdc-checkbox/index.js'),
         chips: getAbsolutePath('/packages/mdc-chips/index.js'),
         dialog: getAbsolutePath('/packages/mdc-dialog/index.js'),
+        dom: getAbsolutePath('/packages/mdc-dom/index.js'),
         drawer: getAbsolutePath('/packages/mdc-drawer/index.js'),
         floatingLabel: getAbsolutePath('/packages/mdc-floating-label/index.js'),
         formField: getAbsolutePath('/packages/mdc-form-field/index.js'),

test/unit/mdc-dom/ponyfill.test.js

@@ -0,0 +1,45 @@
+/**
+ * @license
+ * Copyright 2018 Google Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+import {assert} from 'chai';
+import bel from 'bel';
+
+import {matches} from '../../../packages/mdc-dom/ponyfill';
+
+suite('MDCDom - ponyfill');
+
+test('#matches returns true when the selector matches the element', () => {
+  const element = bel`<div class="foo"></div>`;
+  assert.isTrue(matches(element, '.foo'));
+});
+
+test('#matches returns false when the selector does not match the element', () => {
+  const element = bel`<div class="foo"></div>`;
+  assert.isFalse(matches(element, '.bar'));
+});
+
+test('#matches supports vendor prefixes', () => {
+  assert.isTrue(matches({matches: () => true}, ''));
+  assert.isTrue(matches({webkitMatchesSelector: () => true}, ''));
+  assert.isTrue(matches({msMatchesSelector: () => true}, ''));
+});