mirror of https://github.com/sveltejs/svelte
basic custom element generation (#797)
Rich Harris
7 years ago
parent
89c0b71e25
commit
afe3e2e669
@ -0,0 +1,20 @@
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import usesThisOrArguments from '../utils/usesThisOrArguments';
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import { Validator } from '../../';
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import { Node } from '../../../interfaces';
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export default function tag(validator: Validator, prop: Node) {
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if (prop.value.type !== 'Literal' || typeof prop.value.value !== 'string') {
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validator.error(
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`'tag' must be a string literal`,
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prop.value.start
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);
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}
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const tag = prop.value.value;
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if (!/^[a-zA-Z][a-zA-Z0-9]*-[a-zA-Z0-9-]+$/.test(tag)) {
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validator.error(
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`tag name must be two or more words joined by the '-' character`,
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prop.value.start
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);
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}
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}
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@ -0,0 +1,5 @@
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export default {
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options: {
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customElement: true
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}
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};
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@ -0,0 +1,218 @@
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function noop() {}
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function assign(target) {
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var k,
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source,
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i = 1,
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len = arguments.length;
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for (; i < len; i++) {
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source = arguments[i];
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for (k in source) target[k] = source[k];
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}
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return target;
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}
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function appendNode(node, target) {
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target.appendChild(node);
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}
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function insertNode(node, target, anchor) {
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target.insertBefore(node, anchor);
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}
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function detachNode(node) {
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node.parentNode.removeChild(node);
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}
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function createElement(name) {
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return document.createElement(name);
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}
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function createText(data) {
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return document.createTextNode(data);
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}
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function destroy(detach) {
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this.destroy = noop;
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this.fire('destroy');
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this.set = this.get = noop;
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if (detach !== false) this._fragment.unmount();
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this._fragment.destroy();
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this._fragment = this._state = null;
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}
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function differs(a, b) {
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return a !== b || ((a && typeof a === 'object') || typeof a === 'function');
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}
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function dispatchObservers(component, group, changed, newState, oldState) {
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for (var key in group) {
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if (!changed[key]) continue;
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var newValue = newState[key];
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var oldValue = oldState[key];
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var callbacks = group[key];
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if (!callbacks) continue;
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for (var i = 0; i < callbacks.length; i += 1) {
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var callback = callbacks[i];
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if (callback.__calling) continue;
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callback.__calling = true;
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callback.call(component, newValue, oldValue);
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callback.__calling = false;
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}
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}
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}
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function get(key) {
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return key ? this._state[key] : this._state;
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}
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function fire(eventName, data) {
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var handlers =
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eventName in this._handlers && this._handlers[eventName].slice();
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if (!handlers) return;
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for (var i = 0; i < handlers.length; i += 1) {
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handlers[i].call(this, data);
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}
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}
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function observe(key, callback, options) {
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var group = options && options.defer
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? this._observers.post
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: this._observers.pre;
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(group[key] || (group[key] = [])).push(callback);
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if (!options || options.init !== false) {
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callback.__calling = true;
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callback.call(this, this._state[key]);
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callback.__calling = false;
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}
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return {
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cancel: function() {
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var index = group[key].indexOf(callback);
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if (~index) group[key].splice(index, 1);
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}
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};
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}
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function on(eventName, handler) {
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if (eventName === 'teardown') return this.on('destroy', handler);
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var handlers = this._handlers[eventName] || (this._handlers[eventName] = []);
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handlers.push(handler);
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return {
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cancel: function() {
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var index = handlers.indexOf(handler);
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if (~index) handlers.splice(index, 1);
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}
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};
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}
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function set(newState) {
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this._set(assign({}, newState));
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if (this._root._lock) return;
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this._root._lock = true;
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callAll(this._root._beforecreate);
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callAll(this._root._oncreate);
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callAll(this._root._aftercreate);
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this._root._lock = false;
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}
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function _set(newState) {
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var oldState = this._state,
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changed = {},
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dirty = false;
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for (var key in newState) {
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if (differs(newState[key], oldState[key])) changed[key] = dirty = true;
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}
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if (!dirty) return;
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this._state = assign({}, oldState, newState);
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this._recompute(changed, this._state, oldState, false);
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if (this._bind) this._bind(changed, this._state);
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dispatchObservers(this, this._observers.pre, changed, this._state, oldState);
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this._fragment.update(changed, this._state);
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dispatchObservers(this, this._observers.post, changed, this._state, oldState);
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}
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function callAll(fns) {
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while (fns && fns.length) fns.pop()();
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}
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var proto = {
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destroy: destroy,
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get: get,
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fire: fire,
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observe: observe,
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on: on,
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set: set,
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teardown: destroy,
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_recompute: noop,
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_set: _set
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};
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function create_main_fragment ( state, component ) {
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var div, text;
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return {
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create: function () {
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div = createElement( 'div' );
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text = createText( "I am shadow DOM" );
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},
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mount: function ( target, anchor ) {
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insertNode( div, target, anchor );
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appendNode( text, div );
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},
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update: noop,
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unmount: function () {
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detachNode( div );
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},
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destroy: noop
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};
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}
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class SvelteComponent extends HTMLElement {
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constructor(options = {}) {
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super();
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this.options = options;
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this._state = options.data || {};
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this._observers = {
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pre: Object.create( null ),
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post: Object.create( null )
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};
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this._handlers = Object.create( null );
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this._root = options._root || this;
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this._yield = options._yield;
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this._bind = options._bind;
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this._fragment = create_main_fragment( this._state, this );
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if ( !options._root ) {
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this._fragment.create();
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this._fragment.mount( this.attachShadow({ mode: 'open' }), null );
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}
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}
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}
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customElements.define('custom-element', SvelteComponent);
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assign( SvelteComponent.prototype, proto );
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export default SvelteComponent;
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@ -0,0 +1,57 @@
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import { appendNode, assign, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
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function create_main_fragment ( state, component ) {
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var div, text;
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return {
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create: function () {
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div = createElement( 'div' );
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text = createText( "I am shadow DOM" );
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},
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mount: function ( target, anchor ) {
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insertNode( div, target, anchor );
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appendNode( text, div );
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},
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update: noop,
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unmount: function () {
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detachNode( div );
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},
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destroy: noop
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};
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}
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class SvelteComponent extends HTMLElement {
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constructor(options = {}) {
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super();
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this.options = options;
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this._state = options.data || {};
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this._observers = {
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pre: Object.create( null ),
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post: Object.create( null )
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};
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this._handlers = Object.create( null );
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this._root = options._root || this;
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this._yield = options._yield;
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this._bind = options._bind;
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this._fragment = create_main_fragment( this._state, this );
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if ( !options._root ) {
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this._fragment.create();
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this._fragment.mount( this.attachShadow({ mode: 'open' }), null );
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}
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}
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}
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customElements.define('custom-element', SvelteComponent);
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assign( SvelteComponent.prototype, proto );
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export default SvelteComponent;
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@ -0,0 +1,7 @@
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<div>I am shadow DOM</div>
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<script>
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export default {
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tag: 'custom-element'
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};
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</script>
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