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mancha

Version:

Javscript HTML rendering engine

github.com/fresho-dev/mancha

fresho-dev/mancha

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import{safeAnchorEl as e,safeAreaEl as t,safeElement as n}from"safevalues/dom";import{safeAttrPrefix as r}from"safevalues";function i(e){let t=e.childNodes;for(let e=0;e<t.length;e++){let n=t[e];n.prev=e>0?t[e-1]:null,n.next=e<t.length-1?t[e+1]:null}}const a=[r`:`,r`style`,r`class`];function*o(e,t=new Set){let n=new Set,r=Array.from(e.childNodes).filter(e=>!t.has(e));for(yield e;r.length;){let e=r.shift();n.has(e)||(n.add(e),yield e),e.childNodes&&Array.from(e.childNodes).filter(e=>!t.has(e)).forEach(e=>{r.push(e)})}}function s(e,t){return e?.[t]!==void 0}function c(e,t){return typeof e?.[t]==`function`}function l(e){return e.replace(/-./g,e=>e[1].toUpperCase())}function u(e,t){return e.attribs?e.attribs[t]??null:e.getAttribute?.(t)??null}function d(e,t){return e.attribs?t in e.attribs:e.hasAttribute?.(t)??!1}function f(e,t,n=``){return u(e,n+t)||u(e,`data-${t}`)||(e.dataset?.[l(t)]??null)}function p(e,t,n){e.attribs?e.attribs[t]=n:e.setAttribute?.(t,n)}function m(e,t,r){e.attribs?e.attribs[t]=r:n.setPrefixedAttribute(a,e,t,r)}function h(e,t,n){switch(t){case`disabled`:e.disabled=n;return;case`selected`:e.selected=n;return;case`checked`:e.checked=n;return;default:e[t]=n}}function g(e,t){e.attribs?delete e.attribs[t]:e.removeAttribute?.(t)}function _(e,t,n,r=``){d(e,`${r}${t}`)?p(e,`${r}${t}`,n):d(e,`data-${t}`)?p(e,`data-${t}`,n):p(e,`${r}${t}`,n)}function v(e,t,n=``){g(e,`${n}${t}`),g(e,`data-${t}`)}function y(e,t,n){if(e.attribs&&t.attribs)t.attribs[n]=e.attribs[n];else if(n.startsWith(`data-`)){let r=l(n.slice(5));t.dataset&&e.dataset&&(t.dataset[r]=e.dataset[r])}else{let r=e?.getAttribute?.(n);m(t,n,r||``)}}function b(e){return s(e,`firstElementChild`)?e.firstElementChild:Array.from(e.children).find(e=>e.nodeType===1)}function x(e,...t){if(c(e,`replaceWith`)){e.replaceWith(...t);return}else{let n=e,r=n.parentNode;if(!r)return;let a=Array.from(r.childNodes).indexOf(n);n.parentNode=null,t.forEach(e=>{e.parentNode=r}),r.childNodes=[].concat(Array.from(r.childNodes).slice(0,a),t,Array.from(r.childNodes).slice(a+1)),i(r)}}function S(e,...t){c(e,`replaceChildren`)?e.replaceChildren(...t):(e.childNodes=t,t.forEach(t=>{t.parentNode=e}),i(e))}function C(e,t){return c(t,`appendChild`)?e.appendChild(t):(e.childNodes.push(t),t.parentNode=e,i(e),t)}function w(e,t){return c(t,`removeChild`)?e.removeChild(t):(S(e,...Array.from(e.childNodes).filter(e=>e!==t)),t)}function T(e,t,n){return n?c(e,`insertBefore`)?e.insertBefore(t,n):(t.parentNode&&w(t.parentNode,t),x(n,t,n),t):C(e,t)}function E(e,t=0){return e?e.length<=t?e:`${e.slice(0,t-1)}…`:``}function D(e,t=0){return globalThis.DocumentFragment&&e instanceof DocumentFragment?Array.from(e.childNodes).map(e=>D(e,t)).join(``):E(e.outerHTML||e.nodeValue||String(e),t)}function O(e){return e.includes(`/`)?e.split(`/`).slice(0,-1).join(`/`):``}function k(e){return!e.includes(`://`)&&!e.startsWith(`/`)&&!e.startsWith(`#`)&&!e.startsWith(`data:`)}var A=class e{iterable;constructor(e){this.iterable=e}filter(t){return new e(e.filterGenerator(t,this.iterable))}map(t){return new e(e.mapGenerator(t,this.iterable))}find(e){for(let t of this.iterable)if(e(t))return t}array(){return Array.from(this.iterable)}*generator(){for(let e of this.iterable)yield e}static*filterGenerator(e,t){for(let n of t)e(n)&&(yield n)}static*mapGenerator(e,t){for(let n of t)yield e(n)}static equals(e,t){let n=e[Symbol.iterator](),r=t[Symbol.iterator](),i=n.next(),a=r.next();for(;!i.done&&!a.done;){if(i.value!==a.value)return!1;i=n.next(),a=r.next()}return i.done===a.done}};let j;(function(n){n.resolveIncludes=async function(e,t){let n=e,r=n.tagName?.toLowerCase();if(![`include`,`link`].includes(r)||r===`link`&&u(n,`rel`)!==`subresource`)return;this.log(`include directive found in: `,D(e,128)),this.log(`include params:`,t);let 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Computeds should be pure; use $effect for side effects.`),this.set(t,n)),!0)})}get $(){return this.proxify()}makeEvalFunction(e){return(t,n)=>{let r=_e(e,J),i=new Proxy(n,{has(e,n){return n in e||n in t||n in globalThis},get(e,n){if(typeof n==`string`)return n in e?e[n]:n in t?t[n]:n in globalThis?globalThis[n]:t[n]},set(e,n,r){return typeof n==`string`?n in e?(e[n]=r,!0):(t[n]=r,!0):!1}});return r?.evaluate(i)}}cachedExpressionFunction(e){e=e.trim(),this.expressionCache.has(e)||this.expressionCache.set(e,this.makeEvalFunction(e));let t=this.expressionCache.get(e);if(!t)throw Error(`Failed to retrieve cached expression: ${e}`);return t}eval(e,t={}){let n=this.$;if(this._store.has(e))return n[e];{let r=this.cachedExpressionFunction(e);try{return r(n,t)}catch(t){return console.error(`Failed to evaluate expression: ${e}`),console.error(t),null}}}$resolve(e,t){let n={$pending:!0,$result:null,$error:null};return Promise.resolve().then(()=>e(t)).then(e=>{n.$result=e}).catch(e=>{n.$error=e instanceof Error?e:Error(String(e))}).finally(()=>{n.$pending=!1}),n}},be=class e extends ${_debugLevel=`off`;dirpath=``;_perfData={lifecycle:{},effects:new Map};static DEBUG_LEVELS=[`off`,`lifecycle`,`effects`,`verbose`];_skipNodes=new Set;_customElements=new Map;_pendingValueRetries=[];debug(e){return typeof e==`boolean`?this._debugLevel=e?`lifecycle`:`off`:this._debugLevel=e,this}get debugging(){return this._debugLevel!==`off`}shouldLog(t){return e.DEBUG_LEVELS.indexOf(this._debugLevel)>=e.DEBUG_LEVELS.indexOf(t)}clearPerformanceReport(){this._perfData={lifecycle:{},effects:new Map}}getNodePath(e){let t=[],n=e;for(;n?.tagName;){let e=n.tagName.toLowerCase(),r=n.parentElement;if(r){let i=Array.from(r.children).filter(t=>t.tagName.toLowerCase()===e);if(i.length>1){let r=i.indexOf(n)+1;t.unshift(`${e}:nth-child(${r})`)}else t.unshift(e)}else t.unshift(e);n=r}return t.join(`>`)}buildObserverId(e){let t=e?.directive??`unknown`,n=E(e?.expression??``,32),r=e?.element,i=e?.id??(r?r.dataset?.perfid??r.id??r.dataset?.testid??this.getNodePath(r):`unknown`);return n?`${t}:${i}:${n}`:`${t}:${i}`}recordObserverExecution(e,t){let n=this.buildObserverId(e),r=this._perfData.effects.get(n)??{count:0,totalTime:0};r.count++,r.totalTime+=t,this._perfData.effects.set(n,r)}getPerformanceReport(){let e=Array.from(this._perfData.effects.entries()),t={};for(let[n,r]of e){let e=n.split(`:`)[0];t[e]||(t[e]={count:0,totalTime:0}),t[e].count+=r.count,t[e].totalTime+=r.totalTime}let n=e.map(([e,t])=>({id:e,executionCount:t.count,totalTime:t.totalTime,avgTime:t.count>0?t.totalTime/t.count:0})).sort((e,t)=>t.totalTime-e.totalTime).slice(0,10);return{lifecycle:this._perfData.lifecycle,effects:{total:e.length,byDirective:t,slowest:n},observers:this.getObserverStats()}}effect(e,t){let n=this;function r(){if(!n.shouldLog(`lifecycle`))return e.call(this);let r=performance.now(),i=e.call(this),a=performance.now()-r;return t&&n.recordObserverExecution(t,a),a>16&&console.warn(`[mancha] Slow observer (${a.toFixed(1)}ms):`,n.buildObserverId(t)),n.shouldLog(`effects`)&&console.debug(`[mancha] Observer (${a.toFixed(2)}ms):`,n.buildObserverId(t)),i}return super.effect(r,t)}async fetchRemote(e,t){return fetch(e,{cache:t?.cache??`default`}).then(e=>e.text())}async fetchLocal(e,t){return this.fetchRemote(e,t)}async preprocessString(e,t){this.log(`Preprocessing string content with params: `,t);let n=this.parseHTML(e,t);return await this.preprocessNode(n,t),n}async preprocessRemote(e,t){let n={};t?.cache&&(n.cache=t.cache);let r=await fetch(e,n).then(e=>e.text());return this.preprocessString(r,{...t,dirpath:O(e),rootDocument:t?.rootDocument??!e.endsWith(`.tpl.html`)})}async preprocessLocal(e,t){let n=await this.fetchLocal(e,t);return this.preprocessString(n,{...t,dirpath:O(e),rootDocument:t?.rootDocument??!e.endsWith(`.tpl.html`)})}subrenderer(){let e=new this.constructor().debug(this.debugging);return e._store.set(`$parent`,this),e._store.set(`$rootRenderer`,this.get(`$rootRenderer`)??this),e._customElements=this._customElements,e}log(...e){this.shouldLog(`verbose`)&&console.debug(...e)}async preprocessNode(e,t){let n=this.shouldLog(`lifecycle`)?performance.now():0;t={dirpath:this.dirpath,maxdepth:10,...t};let r=new A(o(e,this._skipNodes)).map(async e=>{this.log(`Preprocessing node: `,D(e,128)),await j.resolveIncludes.call(this,e,t),await j.rebaseRelativePaths.call(this,e,t),await j.registerCustomElements.call(this,e,t),await j.resolveCustomElements.call(this,e,t)});return await Promise.all(r.generator()),n&&(this._perfData.lifecycle.preprocessTime=(this._perfData.lifecycle.preprocessTime??0)+(performance.now()-n)),e}async renderNode(e,t){let n=this.shouldLog(`lifecycle`)?performance.now():0;for(let n of o(e,this._skipNodes))this.log(`Rendering node: `,D(n,128)),await j.resolveForAttribute.call(this,n,t),await j.resolveRenderAttribute.call(this,n,t),await j.resolveDataAttribute.call(this,n,t),await j.resolveTextAttributes.call(this,n,t),await j.resolveHtmlAttribute.call(this,n,t),await j.resolveIfAttribute.call(this,n,t),await j.resolveShowAttribute.call(this,n,t),await j.resolveClassAttribute.call(this,n,t),await j.resolveBindAttribute.call(this,n,t),await j.resolveEventAttributes.call(this,n,t),await j.resolveTextNodeExpressions.call(this,n,t),await j.resolveCustomAttribute.call(this,n,t),await j.resolveCustomProperty.call(this,n,t),await j.stripTypes.call(this,n,t);for(let e of this._pendingValueRetries.splice(0))e();return n&&(this._perfData.lifecycle.renderTime=(this._perfData.lifecycle.renderTime??0)+(performance.now()-n)),e}async mount(e,t){let n=this.shouldLog(`lifecycle`)?performance.now():0;n&&this.clearPerformanceReport(),t={...t,rootNode:e},h(e,`renderer`,this),this._store.set(`$rootNode`,e),this.has(`$rootRenderer`)||this._store.set(`$rootRenderer`,this),this.get(`$rootRenderer`)===this&&await re(this),await this.preprocessNode(e,t),await this.renderNode(e,t),n&&(this._perfData.lifecycle.mountTime=performance.now()-n)}};export{O as n,be as t};