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hyperhtml.js
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1174 lines (1081 loc) · 34.8 KB
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var hyperHTML = (function (globalDocument) {'use strict';
/*! (c) 2017 Andrea Giammarchi @WebReflection, (ISC) */
// ---------------------------------------------
// hyperHTML Public API
// ---------------------------------------------
// The document must be swap-able at runtime.
// Needed by both basicHTML and nativeHTML
hyperHTML.document = globalDocument;
// hyperHTML.bind(el) ⚡️
function hyperHTML(template) {
var hyper = hypers.get(this);
if (
!hyper ||
hyper.template !== (FF ? unique(template) : template)
) {
hyper = upgrade.apply(this, arguments);
hypers.set(this, hyper);
}
update.apply(hyper.updates, arguments);
return this;
}
// hyperHTML.adopt(el) 🐣
hyperHTML.adopt = function adopt(node) {
return function () {
notAdopting = false;
hyperHTML.apply(node, arguments);
notAdopting = true;
return node;
};
};
// hyperHTML.define('transformer', callback) 🌀
hyperHTML.define = function define(transformer, callback) {
transformers[transformer] = callback;
};
// hyperHTML.escape('<html>') => '<text>' 🏃
hyperHTML.escape = function escape(html) {
return html.replace(reEscape, fnEscape);
};
// hyperHTML.wire(obj, 'type:ID') ➰
hyperHTML.wire = function wire(obj, type) {
return arguments.length < 1 ?
wireContent('html') :
(obj == null ?
wireContent(type || 'html') :
wireWeakly(obj, type || 'html')
);
};
// - - - - - - - - - - - - - - - - - - - - - - -
// ---------------------------------------------
// Constants
// ---------------------------------------------
// Node.CONSTANTS
// without assuming Node is globally available
// since this project is used on the backend too
var ELEMENT_NODE = 1;
var ATTRIBUTE_NODE = 2;
var TEXT_NODE = 3;
var COMMENT_NODE = 8;
var DOCUMENT_FRAGMENT_NODE = 11;
// SVG related
var OWNER_SVG_ELEMENT = 'ownerSVGElement';
var SVG_NAMESPACE = 'http://www.w3.org/2000/svg';
var SHOULD_USE_ATTRIBUTE = /^style$/i;
var EXPANDO = '_hyper_html: ';
var UID = EXPANDO + ((Math.random() * new Date) | 0) + ';';
var UIDC = '<!--' + UID + '-->';
// ---------------------------------------------
// DOM Manipulation
// ---------------------------------------------
// return -1 if no differences are found
// the index where differences starts otherwise
function indexOfDifferences(a, b) {
var
i = 0,
aLength = a.length,
bLength = b.length
;
while (i < aLength) {
if (i < bLength && a[i] === b[i]) i++;
else return i;
}
return i === bLength ? -1 : i;
}
// accordingly with the content type
// it replace the content of a node
// with the give child
function populateNode(parent, child) {
switch (child.nodeType) {
case ELEMENT_NODE:
var childNodes = parent.childNodes;
if (childNodes[0] === child) {
removeNodeList(childNodes, 1);
break;
}
resetAndPopulate(parent, child);
break;
case DOCUMENT_FRAGMENT_NODE:
if (indexOfDifferences(parent.childNodes, child.childNodes) !== -1) {
resetAndPopulate(parent, child);
}
break;
case TEXT_NODE:
parent.textContent = child.textContent;
break;
}
}
// remove a list of nodes from startIndex to list.length
function removeNodeList(list, startIndex) {
var length = list.length, child;
while (startIndex < length--) {
child = list[length];
child.parentNode.removeChild(child);
}
}
// erase a node content and populate it
function resetAndPopulate(parent, child) {
parent.textContent = '';
parent.appendChild(child);
}
// append childNodes to a node from a specific index
function updateViaArray(node, childNodes, i) {
var fragment = emptyFragment(node);
if (i !== 0) {
removeNodeList(node.childNodes, i);
appendNodes(fragment, childNodes.slice(i));
node.appendChild(fragment);
} else {
appendNodes(fragment, childNodes);
resetAndPopulate(node, fragment);
}
}
// ---------------------------------------------
// hyperHTML Operations
// ---------------------------------------------
// `<div class="${'attr'}"></div>`
// `<div onclick="${function () {... }}"></div>`
// `<div onclick="${{handleEvent(){ ... }}}"></div>`
// `<div contenteditable="${true}"></div>`
function setAttribute(attribute, removeAttributes) {
var
name = attribute.name,
node = attribute.ownerElement,
isEvent = /^on/.test(name),
isSpecial = name in node && !(
// always use set attribute with SVGs
OWNER_SVG_ELEMENT in node ||
SHOULD_USE_ATTRIBUTE.test(name)
),
type = isEvent ? name.slice(2) : '',
noOwner = isEvent || isSpecial,
oldValue
;
if (noOwner) removeAttributes.push(node, name);
return isEvent ?
function eventAttr(newValue) {
if (oldValue !== newValue) {
if (oldValue) node.removeEventListener(type, oldValue, false);
oldValue = newValue;
if (newValue) node.addEventListener(type, newValue, false);
}
} :
(isSpecial ?
function specialAttr(newValue) {
if (oldValue !== newValue) {
oldValue = newValue;
// WebKit moves the cursor if input.value
// is set again, even if same value
if (node[name] !== newValue) {
// let the browser handle the case
// input.value = null;
// input.value; // ''
if (newValue == null) {
// reflect the null intent,
// do not pass undefined!
node[name] = null;
node.removeAttribute(name);
} else {
node[name] = newValue;
}
}
}
} :
function normalAttr(newValue) {
if (oldValue !== newValue) {
oldValue = newValue;
// avoid triggering again attributeChangeCallback
// if the value was identical
if (attribute.value !== newValue) {
if (newValue == null) {
if (!noOwner) {
// TODO: should attribute.value = null here?
noOwner = true;
node.removeAttributeNode(attribute);
}
} else {
attribute.value = newValue;
if (noOwner) {
noOwner = false;
node.setAttributeNode(attribute);
}
}
}
}
}
);
}
// `<p>${'any'}</p>`
// `<li>a</li>${'virtual'}<li>c</li>`
function setVirtualContent(node, childNodes) {
var oldValue;
var justContent = !childNodes;
return function anyVirtual(value) {
switch (typeof value) {
case 'string':
case 'number':
case 'boolean':
if (justContent) {
if (oldValue !== value) {
oldValue = value;
node.textContent = value;
}
} else if (
childNodes.length === 1 &&
childNodes[0].nodeType === TEXT_NODE
) {
if (oldValue !== value) {
oldValue = value;
childNodes[0].textContent = value;
}
} else {
oldValue = value;
removeNodeList(childNodes, 0);
childNodes = [createText(node, value)];
node.parentNode.insertBefore(childNodes[0], node);
}
break;
case 'function':
if (justContent) {
anyVirtual(value(node, getChildren(node), 0));
} else {
anyVirtual(value(node.parentNode, childNodes, 0));
}
break;
case 'object':
case 'undefined':
if (value == null) {
oldValue = value;
anyVirtual('');
break;
}
default:
oldValue = value;
if (isArray(value)) {
var length = value.length;
if (length === 0 && !justContent) {
removeNodeList(childNodes, 0);
childNodes = [];
} else {
switch (typeof value[0]) {
case 'string':
case 'number':
case 'boolean':
anyVirtual({html: value});
break;
case 'function':
var parentNode = justContent ? node : node.parentNode;
var children = justContent ?
slice.call(getChildren(node)) : childNodes;
for (var i = 0; i < length; i++) {
value[i] = value[i](parentNode, children, i);
}
if (justContent) removeNodeList(children, i);
anyVirtual(value.concat.apply([], value));
break;
case 'object':
if (isArray(value[0])) {
value = value.concat.apply([], value);
}
if (isPromise_ish(value[0])) {
Promise.all(value).then(anyVirtual);
break;
}
default:
if (justContent) {
var i = indexOfDifferences(node.childNodes, value);
if (i !== -1) updateViaArray(node, value, i);
} else {
updateVirtualNodes(node, childNodes, value);
}
break;
}
}
} else if (isNode_ish(value)) {
if (justContent) populateNode(node, value);
else updateVirtualNodes(
node,
childNodes,
value.nodeType === DOCUMENT_FRAGMENT_NODE ?
slice.call(value.childNodes) :
[value]
);
} else if (isPromise_ish(value)) {
value.then(anyVirtual);
} else if ('placeholder' in value) {
invokeAtDistance(anyVirtual, value);
} else if ('text' in value) {
anyVirtual(String(value.text));
} else if ('any' in value) {
anyVirtual(value.any);
} else if ('html' in value) {
var html = [].concat(value.html).join('');
// TODO: should it trash the layout each time?
// should it use oldValue instead?
if (justContent) node.innerHTML = html;
else {
removeNodeList(childNodes, 0);
var fragment = createFragment(node, html);
childNodes = slice.call(fragment.childNodes);
node.parentNode.insertBefore(fragment, node);
}
} else if ('length' in value) {
anyVirtual(slice.call(value));
} else {
anyVirtual(invokeTransformer(value));
}
break;
}
};
}
// ---------------------------------------------
// DOM Traversing
// ---------------------------------------------
// look for attributes that contains the comment text
function attributesSeeker(node, paths) {
for (var
attribute,
value = UID,
attributes = node.attributes,
i = 0, length = attributes.length;
i < length; i++
) {
attribute = attributes[i];
if (attribute.value === value) {
paths.push(
Path(
'attr',
// with IE the order doesn't really matter
// as long as the right attribute is addressed
IE ?
node.attributes[IEAttributes.shift()] :
attribute
)
);
}
}
}
// walk the fragment tree in search of comments
function hyperSeeker(node, paths) {
for (var
child,
childNodes = node.childNodes,
length = childNodes.length,
i = 0; i < length; i++
) {
child = childNodes[i];
switch (child.nodeType) {
case ELEMENT_NODE:
attributesSeeker(child, paths);
hyperSeeker(child, paths);
break;
case COMMENT_NODE:
if (child.textContent === UID) {
if (length === 1 || (
noContent(child, 'previous') &&
noContent(child, 'next')
)) {
paths.push(Path('any', node));
i = length;
} else {
paths.push(Path('virtual', child));
}
}
break;
case TEXT_NODE:
if (
SHOULD_USE_ATTRIBUTE.test(node.nodeName) &&
trim.call(child.textContent) === UIDC
) {
paths.push(Path('any', node));
}
break;
}
}
}
// ---------------------------------------------
// Features detection / ugly UA sniffs
// ---------------------------------------------
var featureFragment = createDocumentFragment(globalDocument);
// Firefox < 55 has non standard template literals.
// https://bugzilla.mozilla.org/show_bug.cgi?id=1108941
// TODO: is there any better way to feature detect this ?
var FF = typeof navigator === 'object' &&
/Firefox\/(\d+)/.test(navigator.userAgent) &&
parseFloat(RegExp.$1) < 55;
// If attributes order is shuffled, threat the browser differently
// Usually this is a well known IE only limitation but some older FF does the same.
var IE = (function () {
var p = globalDocument.createElement('p');
p.innerHTML = '<i data-i="" class=""></i>';
return /class/i.test(p.firstChild.attributes[0].name);
}());
// beside IE, old WebKit browsers don't have `children` in DocumentFragment
var WK = !('children' in featureFragment);
// ---------------------------------------------
// Helpers
// ---------------------------------------------
// used to convert childNodes to Array
var slice = [].slice;
// used to sanitize html
var reEscape = /[&<>'"]/g;
var oEscape = {
'&': '&',
'<': '<',
'>': '>',
"'": ''',
'"': '"'
};
function fnEscape(m) {
return oEscape[m];
}
// return content as html
function asHTML(html) {
return {html: html};
}
// return a single node or an Array or nodes
function createContent(node) {
for (var
child,
content = [],
childNodes = node.childNodes,
i = 0,
length = childNodes.length;
i < length; i++
) {
child = childNodes[i];
if (
child.nodeType === ELEMENT_NODE ||
trim.call(child.textContent).length !== 0
) {
content.push(child);
}
}
return content.length === 1 ? content[0] : content;
}
// just a minifier friendly indirection
function createDocumentFragment(document) {
return document.createDocumentFragment();
}
// given a node, inject some html and return
// the resulting template document fragment
function createFragment(node, html) {
IEAttributes = [];
return (
OWNER_SVG_ELEMENT in node ?
createSVGFragment :
createHTMLFragment
)(node, html.replace(no, comments));
}
// create fragment for HTML
function createHTMLFragment(node, html) {
var fragment;
var document = node.ownerDocument;
var container = document.createElement('template');
var hasContent = 'content' in container;
var needsTableWrap = false;
if (!hasContent) {
// DO NOT MOVE THE FOLLOWING LINE ELSEWHERE
fragment = createDocumentFragment(document);
// (a jsdom + nodejs tests coverage gotcha)
// el.innerHTML = '<td></td>'; is not possible
// if the content is a partial internal table content
// it needs to be wrapped around once injected.
// HTMLTemplateElement does not suffer this issue.
needsTableWrap = /^[^\S]*?<(t(?:head|body|foot|r|d|h))/i.test(html);
}
if (needsTableWrap) {
// secure the RegExp.$1 result ASAP to avoid issues
// in case a non-browser DOM library uses RegExp internally
// when HTML content is injected (basicHTML / jsdom / others...)
var selector = RegExp.$1;
container.innerHTML = '<table>' + html + '</table>';
appendNodes(fragment, slice.call(container.querySelectorAll(selector)));
} else {
container.innerHTML = html;
if (hasContent) {
fragment = container.content;
} else {
appendNodes(fragment, slice.call(container.childNodes));
}
}
return fragment;
}
// create a fragment for SVG
function createSVGFragment(node, html) {
var document = node.ownerDocument;
var fragment = createDocumentFragment(document);
if (IE || WK) {
var container = document.createElement('div');
container.innerHTML = '<svg xmlns="' + SVG_NAMESPACE + '">' + html + '</svg>';
appendNodes(fragment, slice.call(container.firstChild.childNodes));
} else {
var container = document.createElementNS(SVG_NAMESPACE, 'svg');
container.innerHTML = html;
appendNodes(fragment, slice.call(container.childNodes));
}
return fragment;
}
// given a node, it does what is says
function createText(node, text) {
return node.ownerDocument.createTextNode(text);
}
// given an info, tries to find out the best option
// to replace or update the content
function discoverNode(parentNode, virtual, info, childNodes) {
for (var
target = parentNode,
document = parentNode.ownerDocument,
path = info.path,
virtualNode = getNode(virtual, path),
i = 0,
length = path.length;
i < length; i++
) {
switch (path[i++]) {
case 'attributes':
var name = virtualNode.name;
if (!parentNode.hasAttribute(name)) {
parentNode.setAttribute(name, '');
}
target = parentNode.attributes[name];
break;
case 'childNodes':
var children = getChildren(parentNode);
var virtualChildren = getChildren(virtualNode.parentNode);
target = previousElementSibling(virtualNode);
var before = target ? (path.indexOf.call(virtualChildren, target) + 1) : -1;
target = nextElementSibling(virtualNode);
var after = target ? path.indexOf.call(virtualChildren, target) : -1;
target = document.createComment(UID);
switch (true) {
// `${'virtual'}` is actually resolved as `${'any'}`
// case before < 0 && after < 0: before = 0;
// `</a>${'virtual'}`
case after < 0:
after = children.length;
break;
// `${'virtual'}<b>`
case before < 0:
before = 0;
// `</a>${'virtual'}<b>`
default:
after = -(virtualChildren.length - after);
break;
}
childNodes.push.apply(
childNodes,
slice.call(children, before, after)
);
if (childNodes.length) {
insertBefore(
parentNode,
target,
nextElementSibling(childNodes[childNodes.length - 1])
);
} else {
insertBefore(
parentNode,
target,
slice.call(children, after)[0]
);
}
if (childNodes.length === 0) {
removePreviousText(parentNode, target);
}
break;
default:
// if the node is not there, create it
target = getChildren(parentNode)[path[i]] ||
parentNode.appendChild(
parentNode.ownerDocument.createElement(
getNode(virtual, path.slice(0, i + 1)).nodeName
)
);
parentNode = target;
break;
}
}
return target;
}
function insertBefore(parentNode, target, after) {
if (after) {
parentNode.insertBefore(target, after);
} else {
parentNode.appendChild(target);
}
}
// create an empty fragment from a generic node
function emptyFragment(node) {
return createDocumentFragment(node.ownerDocument);
}
// use a placeholder and resolve with the right callback
function invokeAtDistance(callback, value) {
callback(value.placeholder);
if ('text' in value) {
Promise.resolve(value.text).then(String).then(callback);
} else if ('any' in value) {
Promise.resolve(value.any).then(callback);
} else if ('html' in value) {
Promise.resolve(value.html).then(asHTML).then(callback);
} else {
Promise.resolve(invokeTransformer(value)).then(callback);
}
}
// last attempt to transform content
function invokeTransformer(object) {
for (var key in transformers) {
if (object.hasOwnProperty(key)) {
return transformers[key](object[key]);
}
}
}
// quick and dirty Node check
function isNode_ish(value) {
return 'ELEMENT_NODE' in value;
}
// quick and dirty Promise check
function isPromise_ish(value) {
return value != null && 'then' in value;
}
// given a node and a direction
// returns true if there's no content
function noContent(node, direction) {
while (
((node = node[direction + 'Sibling']) != null) &&
node.nodeType === TEXT_NODE &&
trim.call(node.textContent).length < 1
);
return node == null;
}
// remove a list of [node, attribute]
function removeAttributeList(list) {
for (var i = 0, length = list.length; i < length; i++) {
list[i++].removeAttribute(list[i]);
}
}
// remove all text nodes from a virtual space
function removePreviousText(parentNode, node) {
var previousSibling = node.previousSibling;
if (previousSibling && previousSibling.nodeType === TEXT_NODE) {
parentNode.removeChild(previousSibling);
removePreviousText(parentNode, node);
}
}
// specify the content to update
function setContent(type, target, removeAttributes, childNodes) {
var update;
switch (type) {
case 'any':
update = setVirtualContent(target, null);
break;
case 'attr':
update = setAttribute(target, removeAttributes);
break;
case 'virtual':
update = setVirtualContent(target, childNodes);
break;
}
return update;
}
// update partially or fully the list of virtual nodes
// it modifies in place the childNodes list if necessary
function updateVirtualNodes(node, childNodes, value) {
var i = indexOfDifferences(childNodes, value);
if (i !== -1) {
var fragment = emptyFragment(node);
removeNodeList(childNodes, i);
childNodes.splice(i);
value = value.slice(i);
appendNodes(fragment, value);
node.parentNode.insertBefore(fragment, node);
childNodes.push.apply(childNodes, value);
}
}
// used for common path creation.
function Path(type, node) {
return {type: type, path: createPath(node)};
}
// ---------------------------------------------
// Hybrid Shims
// ---------------------------------------------
// WeakMap with partial EXPANDO fallback
var $WeakMap = typeof WeakMap === typeof $WeakMap ?
function () {
return {
get: function (obj) { return obj[EXPANDO]; },
set: function (obj, value) {
Object.defineProperty(obj, EXPANDO, {
configurable: true,
value: value
});
}
};
} :
WeakMap;
// Map with partial double Array fallback
var $Map = typeof Map === typeof $Map ?
function () {
var k = [], v = [];
return {
get: function (obj) {
return v[k.indexOf(obj)];
},
// being used with unique template literals
// there is never a case when a value is overwritten
// no need to check upfront for the indexOf
set: function (obj, value) {
v[k.push(obj) - 1] = value;
}
};
} :
Map;
// TODO: which browser needs these partial polyfills here?
// BB7 and webOS need this
var isArray = Array.isArray ||
(function () {
var toString = {}.toString;
// I once had an engine returning [array Array]
// and I've got scared since!
var s = toString.call([]);
return function (a) {
return toString.call(a) === s;
};
}());
// older WebKit need this
var trim = EXPANDO.trim ||
function () { return this.replace(/^\s+|\s+$/g, ''); };
// ---------------------------------------------
// Shared variables
// ---------------------------------------------
// transformers registry
var transformers = {};
// normalize Firefox issue with template literals
var templateObjects, unique;
if (FF) {
templateObjects = {};
unique = function (template) {
var key = '_' + template.join(UIDC);
return templateObjects[key] ||
(templateObjects[key] = template);
};
}
// use native .append(...childNodes) where available
var appendNodes = 'append' in featureFragment ?
function (node, childNodes) {
node.append.apply(node, childNodes);
} :
function appendNodes(node, childNodes) {
for (var
i = 0,
length = childNodes.length;
i < length; i++
) {
node.appendChild(childNodes[i]);
}
};
// redefine bind to always point at hyperHTML
// (useful in destructuring)
hyperHTML.bind = function (context) {
return function () {
return hyperHTML.apply(context, arguments);
};
};
// returns children or retrieve them in IE/Edge
var getChildren = WK || IE ?
function (node) {
for (var
child,
children = [],
childNodes = node.childNodes,
j = 0, i = 0, length = childNodes.length;
i < length; i++
) {
child = childNodes[i];
if (child.nodeType === ELEMENT_NODE)
children[j++] = child;
}
return children;
} :
function (node) { return node.children; };
// return the correct node walking through a path
// fixes IE/Edge issues with attributes and children (fixes old WebKit too)
var getNode = IE || WK ?
function (parentNode, path) {
for (var name, i = 0, length = path.length; i < length; i++) {
name = path[i++];
switch (name) {
case 'children':
parentNode = getChildren(parentNode)[path[i]];
break;
default:
parentNode = parentNode[name][path[i]];
break;
}
}
return parentNode;
} :
function (parentNode, path) {
for (var i = 0, length = path.length; i < length; i++) {
parentNode = parentNode[path[i++]][path[i]];
}
return parentNode;
};
// fixes IE problems with comments and sanitizes other browsers
var IEAttributes;
var no = /(<[a-z]+[a-z0-9:_-]*)((?:[^\S]+[a-z0-9:_-]+(?:=(?:'.*?'|".*?"|<.+?>|\S+))?)+)([^\S]*\/?>)/gi;
var findAttributes = new RegExp('([^\\S][a-z]+[a-z0-9:_-]*=)([\'"]?)' + UIDC + '\\2', 'gi');
var comments = function ($0, $1, $2, $3) {
return $1 + $2.replace(
findAttributes,
IE ?
function ($0, $1, $2) {
IEAttributes.push($1.slice(1, -1));
return replaceAttributes($0, $1, $2);
} :
replaceAttributes
) + $3;
};
var replaceAttributes = function ($0, $1, $2) {
return $1 + ($2 || '"') + UID + ($2 || '"');
};
// IE/Edge gotcha with comment nodes
var nextElementSibling = IE ?
function (node) {
while (node = node.nextSibling) {
if (node.nodeType === ELEMENT_NODE) return node;
}
return undefined;
} :
function (node) { return node.nextElementSibling; };
var previousElementSibling = IE ?
function (node) {
while (node = node.previousSibling) {
if (node.nodeType === ELEMENT_NODE) return node;
}
return undefined;
} :
function (node) { return node.previousElementSibling; };
// [element] = {template, updates};
var hypers = new $WeakMap;
// [element] = {template, updates};
var wires = new $WeakMap;
// [template] = {fragment, paths};
var templates = new $Map;
// internal signal to switch adoption
var notAdopting = true;
// IE 11 has problems with cloning templates too
// it "forgets" empty childNodes
var cloneNode = (function () {
featureFragment.appendChild(createText(featureFragment, 'g'));
featureFragment.appendChild(createText(featureFragment, ''));
return featureFragment.cloneNode(true).childNodes.length === 1 ?
function (node) {
for (var
clone = node.cloneNode(),
childNodes = node.childNodes || [],
i = 0, length = childNodes.length;
i < length; i++
) {
clone.appendChild(cloneNode(childNodes[i]));
}
return clone;
} :
function (fragment) {
return fragment.cloneNode(true);
};
}());
// ---------------------------------------------
// Template related utilities
// ---------------------------------------------
// given a unique template object
// create, parse, and store retrieved info
function createTemplate(template) {
var paths = [];
var fragment = createFragment(this, template.join(UIDC));
var info = {fragment: fragment, paths: paths};
hyperSeeker(fragment, paths);
templates.set(template, info);
return info;
}
// given a generic node, returns a path capable
// of retrieving such path back again.
// TODO: worth passing the index when available ?
function createPath(node) {
var path = [];
var parentNode;
switch(node.nodeType) {
case ELEMENT_NODE:
case DOCUMENT_FRAGMENT_NODE:
parentNode = node;
break;
case COMMENT_NODE:
parentNode = node.parentNode;
path.unshift(
'childNodes',
path.indexOf.call(parentNode.childNodes, node)
);
break;
case ATTRIBUTE_NODE:
default: // jsdom here does not provide a nodeType 2 ...
parentNode = node.ownerElement;