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, XSL_NS_URL = 'http://www.w3.org/1999/XSL/Transform'
, DCE_NS_URL ="urn:schemas-epa-wg:dce";
// const log = x => console.debug( new XMLSerializer().serializeToString( x ) );
const attr = (el, attr)=> el.getAttribute(attr)
, create = ( tag, t = '' ) => ( e => ((e.innerText = t||''),e) )(document.createElement( tag ))
, createNS = ( ns, tag, t = '' ) => ( e => ((e.innerText = t||''),e) )(document.createElementNS( ns, tag ));
function
xml2dom( xmlString )
{
return new DOMParser().parseFromString( XML_DECLARATION + xmlString, "application/xml" )
}
function
xmlString(doc){ return new XMLSerializer().serializeToString( doc ) }
function
injectData( root, sectionName, arr, cb )
{
const inject = ( tag, parent, s ) =>
{
parent.append( s = createNS( DCE_NS_URL, tag ) );
return s;
};
const l = inject( sectionName, root );
[ ...arr ].forEach( e => l.append( cb( e ) ) );
return l;
}
function
assureSlot( e )
{
if( !e.slot )
{
if( !e.setAttribute )
e = create( 'span', e.textContent.replaceAll( '\n', '' ) );
e.setAttribute( 'slot', '' )
}
return e;
}
export function
Json2Xml( o, tag )
{
if( typeof o === 'string' )
return o;
const noTag = "string" != typeof tag;
if( o instanceof Array )
{ noTag && (tag = 'array');
return "<"+tag+">"+o.map(function(el){ return Json2Xml(el,tag); }).join()+"</"+tag+">";
}
noTag && (tag = 'r');
tag=tag.replace( /[^a-z0-9\-]/gi,'_' );
var oo = {}
, ret = [ "<"+tag+" "];
for( let k in o )
if( typeof o[k] == "object" )
oo[k] = o[k];
else
ret.push( k.replace( /[^a-z0-9\-]/gi,'_' ) + '="'+o[k].toString().replace(/&/gi,'&')+'"');
if( oo )
{ ret.push(">");
for( let k in oo )
ret.push( Json2Xml( oo[k], k ) );
ret.push("</"+tag+">");
}else
ret.push("/>");
return ret.join('\n');
}
export function
createXsltFromDom( templateNode, S = 'xsl:stylesheet' )
{
if( templateNode.tagName === S || templateNode.documentElement?.tagName === S )
return templateNode
const dom = xml2dom(
`<xsl:stylesheet version="1.0"
xmlns:xsl="${ XSL_NS_URL }"
>
<xsl:output method="html" />
<xsl:template match="/">
<xsl:for-each select="//attributes">
<xsl:call-template name="attributes"/>\t
</xsl:for-each>
</xsl:template>
<xsl:template name="slot" >
<xsl:param name="slotname" />
<xsl:param name="defaultvalue" />
<xsl:choose>
<xsl:when test="//payload/*[@slot=$slotname]">
<xsl:copy-of select="//payload/*[@slot=$slotname]"/>
</xsl:when>
<xsl:otherwise>
<xsl:copy-of select="$defaultvalue"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template name="attributes"></xsl:template>
<xsl:variable name="slottemplate">
<xsl:call-template name="slot" >
<xsl:with-param name="slotname" select="''"/>
<xsl:with-param name="defaultvalue"/>
</xsl:call-template>
</xsl:variable>
</xsl:stylesheet>`
);
const attrsTemplate = dom.documentElement.lastElementChild.previousElementSibling
, getTemplateRoot = n => n.documentElement || n.firstElementChild?.content || n.content || n.body || n
, tc = getTemplateRoot(templateNode)
, cc = tc?.childNodes || [];
if( (tc instanceof CustomElement) || tc.nodeType===11) {
for( let c of cc )
attrsTemplate.append(dom.importNode(c,true))
}else
{
attrsTemplate.append(dom.importNode(tc,true))
}
const slot2xsl = s =>
{ const v = dom.firstElementChild.lastElementChild.lastElementChild.cloneNode(true);
v.firstElementChild.setAttribute('select',`'${s.name}'`)
for( let c of s.childNodes)
v.lastElementChild.append(c)
return v
}
for( const s of attrsTemplate.querySelectorAll('slot') )
s.parentNode.replaceChild( slot2xsl(s), s )
// apply bodyXml changes
return dom
}
export async function
xhrTemplate(src)
{
const dom = await new Promise((resolve,reject)=>
{ const xhr = new XMLHttpRequest();
xhr.open("GET", src);
xhr.responseType = "document";
// xhr.overrideMimeType("text/xml");
xhr.onload = () =>
{ if( xhr.readyState === xhr.DONE && xhr.status === 200 )
resolve( xhr.responseXML || create('div', xhr.responseText ) )
reject(xhr.statusText)
};
xhr.addEventListener("error", ev=>reject(ev) );
xhr.send();
})
return dom
}
export function
deepEqual(a, b, O=false)
{
if( a === b )
return true;
if( (typeof a !== "object" || a === null) || (typeof b !== "object" || b === null)
|| Object.keys(a).length !== Object.keys(b).length )
return O;
for( let k in a )
if( !(k in b) || !deepEqual( a[k], b[k] ) )
return O
return true;
}
export function
injectSlice( x, s, data )
{
const isString = typeof data === 'string' ;
const el = isString
? create(s, data)
: document.adoptNode( xml2dom( Json2Xml( data, s ) ).documentElement);
[...x.children].filter( e=>e.localName === s ).map( el=>el.remove() );
el.data = data
x.append(el);
}
function forEach$( el, css, cb){
if( el.querySelectorAll )
for( let n of el.querySelectorAll(css) )
cb(n)
}
const getByHashId = ( n, id )=> ( p => n===p? null: (p && ( p.querySelector(id) || getByHashId(p,id) ) ))( n.getRootNode() )
const loadTemplateRoots = async ( src, dce )=>
{
if( !src || !src.trim() )
return [dce]
if( src.startsWith('#') )
return ( n =>
{ if(!n) return []
const a = n.querySelectorAll(src)
if( a.length )
return [...a]
const r = n.getRootNode();
return r===n ? []: getByHashId(r)
})(dce.parentElement)
try
{ // todo cache
const dom = await xhrTemplate(src)
const hash = new URL(src, location).hash
if( hash )
{ const ret = dom.querySelectorAll(hash);
if( ret.length )
return [...ret]
return [dce]
}
return [dom]
}catch (error){ return [dce]}
}
export class
CustomElement extends HTMLElement
{
async connectedCallback()
{
const templateRoots = await loadTemplateRoots( attr( this, 'src' ), this )
, templateDocs = templateRoots.map( n => createXsltFromDom( n ) )
, xp = templateDocs.map( (td, p) =>{ p = new XSLTProcessor(); p.importStylesheet( td ); return p })
Object.defineProperty( this, "xsltString", { get: ()=>xp.map( td => xmlString(td) ).join('\n') });
const tag = attr( this, 'tag' );
const dce = this;
const sliceNames = [...this.templateNode.querySelectorAll('[slice]')].map(e=>attr(e,'slice'));
class DceElement extends HTMLElement
{
connectedCallback()
{ const x = createNS( DCE_NS_URL,'datadom' );
injectData( x, 'payload' , this.childNodes, assureSlot );
injectData( x, 'attributes' , this.attributes, e => create( e.nodeName, e.value ) );
injectData( x, 'dataset', Object.keys( this.dataset ), k => create( k, this.dataset[ k ] ) );
const sliceRoot = injectData( x, 'slice', sliceNames, k => create( k, '' ) );
this.xml = x;
const slices = {};
const sliceEvents=[];
const applySlices = ()=>
{ const processed = {}
for(let ev; ev = sliceEvents.pop(); )
{ const s = attr( ev.target, 'slice');
if( processed[s] )
continue;
injectSlice( sliceRoot, s, ev.detail );
processed[s] = ev;
}
Object.keys(processed).length !== 0 && transform();
}
let timeoutID;
this.onSlice = ev=>
{ ev.stopPropagation?.();
const s = attr( ev.target, 'slice')
if( deepEqual( ev.detail, [...sliceRoot.children].find( e=>e.localName === s )?.data ) )
return
sliceEvents.push(ev);
if( !timeoutID )
timeoutID = setTimeout(()=>
{ applySlices();
timeoutID =0;
},10);
};
const transform = ()=>
{
const ff = xp.map( p => p.transformToFragment(x, document) );
this.innerHTML = '';
ff.map( f =>
{ [ ...f.childNodes ].forEach( e => this.append( e ) );
forEach$( this,'[slice]', el =>
{ if( 'function' === typeof el.sliceInit )
{ const s = attr( el,'slice' );
slices[s] = el.sliceInit( slices[s] );
}
})
})
};
transform();
applySlices();
}
get dce(){ return dce }
}
if(tag)
window.customElements.define( tag, DceElement);
else
{ const t = 'dce-'+crypto.randomUUID()
window.customElements.define( t, DceElement);
const el = document.createElement(t);
this.getAttributeNames().forEach(a=>el.setAttribute(a,this.getAttribute(a)));
el.append(...this.childNodes)
this.append(el);
}
}
get templateNode(){ return this.firstElementChild?.tagName === 'TEMPLATE'? this.firstElementChild.content : this }
get dce(){ return this }
get xslt(){ return xml2dom( this.xsltString ) }
}
window.customElements.define( 'custom-element', CustomElement );
export default CustomElement;
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