Merge branch 'develop' into a11y-improvements

# Conflicts:
#	dist/plyr.js
#	dist/plyr.js.map
#	dist/plyr.min.js
#	dist/plyr.min.js.map
#	dist/plyr.polyfilled.js
#	dist/plyr.polyfilled.js.map
#	dist/plyr.polyfilled.min.js
#	dist/plyr.polyfilled.min.js.map
#	src/js/controls.js
#	src/js/fullscreen.js
#	src/js/plyr.js
#	src/js/ui.js
#	src/js/utils.js

1 files changed, 285 insertions, 0 deletions

diff --git a/src/js/utils/elements.js b/src/js/utils/elements.js
new file mode 100644
index 00000000..69e4d46c
--- /dev/null
+++ b/src/js/utils/elements.js
@@ -0,0 +1,285 @@
+// ==========================================================================
+// Element utils
+// ==========================================================================
+
+import { toggleListener } from './events';
+import is from './is';
+
+// Wrap an element
+export function wrap(elements, wrapper) {
+    // Convert `elements` to an array, if necessary.
+    const targets = elements.length ? elements : [elements];
+
+    // Loops backwards to prevent having to clone the wrapper on the
+    // first element (see `child` below).
+    Array.from(targets)
+        .reverse()
+        .forEach((element, index) => {
+            const child = index > 0 ? wrapper.cloneNode(true) : wrapper;
+
+            // Cache the current parent and sibling.
+            const parent = element.parentNode;
+            const sibling = element.nextSibling;
+
+            // Wrap the element (is automatically removed from its current
+            // parent).
+            child.appendChild(element);
+
+            // If the element had a sibling, insert the wrapper before
+            // the sibling to maintain the HTML structure; otherwise, just
+            // append it to the parent.
+            if (sibling) {
+                parent.insertBefore(child, sibling);
+            } else {
+                parent.appendChild(child);
+            }
+        });
+}
+
+// Set attributes
+export function setAttributes(element, attributes) {
+    if (!is.element(element) || is.empty(attributes)) {
+        return;
+    }
+
+    // Assume null and undefined attributes should be left out,
+    // Setting them would otherwise convert them to "null" and "undefined"
+    Object.entries(attributes)
+        .filter(([, value]) => !is.nullOrUndefined(value))
+        .forEach(([key, value]) => element.setAttribute(key, value));
+}
+
+// Create a DocumentFragment
+export function createElement(type, attributes, text) {
+    // Create a new <element>
+    const element = document.createElement(type);
+
+    // Set all passed attributes
+    if (is.object(attributes)) {
+        setAttributes(element, attributes);
+    }
+
+    // Add text node
+    if (is.string(text)) {
+        element.innerText = text;
+    }
+
+    // Return built element
+    return element;
+}
+
+// Inaert an element after another
+export function insertAfter(element, target) {
+    target.parentNode.insertBefore(element, target.nextSibling);
+}
+
+// Insert a DocumentFragment
+export function insertElement(type, parent, attributes, text) {
+    // Inject the new <element>
+    parent.appendChild(createElement(type, attributes, text));
+}
+
+// Remove element(s)
+export function removeElement(element) {
+    if (is.nodeList(element) || is.array(element)) {
+        Array.from(element).forEach(removeElement);
+        return;
+    }
+
+    if (!is.element(element) || !is.element(element.parentNode)) {
+        return;
+    }
+
+    element.parentNode.removeChild(element);
+}
+
+// Remove all child elements
+export function emptyElement(element) {
+    let { length } = element.childNodes;
+
+    while (length > 0) {
+        element.removeChild(element.lastChild);
+        length -= 1;
+    }
+}
+
+// Replace element
+export function replaceElement(newChild, oldChild) {
+    if (!is.element(oldChild) || !is.element(oldChild.parentNode) || !is.element(newChild)) {
+        return null;
+    }
+
+    oldChild.parentNode.replaceChild(newChild, oldChild);
+
+    return newChild;
+}
+
+// Get an attribute object from a string selector
+export function getAttributesFromSelector(sel, existingAttributes) {
+    // For example:
+    // '.test' to { class: 'test' }
+    // '#test' to { id: 'test' }
+    // '[data-test="test"]' to { 'data-test': 'test' }
+
+    if (!is.string(sel) || is.empty(sel)) {
+        return {};
+    }
+
+    const attributes = {};
+    const existing = existingAttributes;
+
+    sel.split(',').forEach(s => {
+        // Remove whitespace
+        const selector = s.trim();
+        const className = selector.replace('.', '');
+        const stripped = selector.replace(/[[\]]/g, '');
+
+        // Get the parts and value
+        const parts = stripped.split('=');
+        const key = parts[0];
+        const value = parts.length > 1 ? parts[1].replace(/["']/g, '') : '';
+
+        // Get the first character
+        const start = selector.charAt(0);
+
+        switch (start) {
+            case '.':
+                // Add to existing classname
+                if (is.object(existing) && is.string(existing.class)) {
+                    existing.class += ` ${className}`;
+                }
+
+                attributes.class = className;
+                break;
+
+            case '#':
+                // ID selector
+                attributes.id = selector.replace('#', '');
+                break;
+
+            case '[':
+                // Attribute selector
+                attributes[key] = value;
+
+                break;
+
+            default:
+                break;
+        }
+    });
+
+    return attributes;
+}
+
+// Toggle hidden
+export function toggleHidden(element, hidden) {
+    if (!is.element(element)) {
+        return;
+    }
+
+    let hide = hidden;
+
+    if (!is.boolean(hide)) {
+        hide = !element.hasAttribute('hidden');
+    }
+
+    if (hide) {
+        element.setAttribute('hidden', '');
+    } else {
+        element.removeAttribute('hidden');
+    }
+}
+
+// Mirror Element.classList.toggle, with IE compatibility for "force" argument
+export function toggleClass(element, className, force) {
+    if (is.element(element)) {
+        let method = 'toggle';
+        if (typeof force !== 'undefined') {
+            method = force ? 'add' : 'remove';
+        }
+
+        element.classList[method](className);
+        return element.classList.contains(className);
+    }
+
+    return null;
+}
+
+// Has class name
+export function hasClass(element, className) {
+    return is.element(element) && element.classList.contains(className);
+}
+
+// Element matches selector
+export function matches(element, selector) {
+    const prototype = { Element };
+
+    function match() {
+        return Array.from(document.querySelectorAll(selector)).includes(this);
+    }
+
+    const matches =
+        prototype.matches ||
+        prototype.webkitMatchesSelector ||
+        prototype.mozMatchesSelector ||
+        prototype.msMatchesSelector ||
+        match;
+
+    return matches.call(element, selector);
+}
+
+// Find all elements
+export function getElements(selector) {
+    return this.elements.container.querySelectorAll(selector);
+}
+
+// Find a single element
+export function getElement(selector) {
+    return this.elements.container.querySelector(selector);
+}
+
+// Get the focused element
+export function getFocusElement() {
+    let focused = document.activeElement;
+
+    if (!focused || focused === document.body) {
+        focused = null;
+    } else {
+        focused = document.querySelector(':focus');
+    }
+
+    return focused;
+}
+
+// Trap focus inside container
+export function trapFocus(element = null, toggle = false) {
+    if (!is.element(element)) {
+        return;
+    }
+
+    const focusable = getElements.call(this, 'button:not(:disabled), input:not(:disabled), [tabindex]');
+    const first = focusable[0];
+    const last = focusable[focusable.length - 1];
+
+    const trap = event => {
+        // Bail if not tab key or not fullscreen
+        if (event.key !== 'Tab' || event.keyCode !== 9) {
+            return;
+        }
+
+        // Get the current focused element
+        const focused = getFocusElement();
+
+        if (focused === last && !event.shiftKey) {
+            // Move focus to first element that can be tabbed if Shift isn't used
+            first.focus();
+            event.preventDefault();
+        } else if (focused === first && event.shiftKey) {
+            // Move focus to last element that can be tabbed if Shift is used
+            last.focus();
+            event.preventDefault();
+        }
+    };
+
+    toggleListener.call(this, this.elements.container, 'keydown', trap, toggle, false);
+}