86 lines
2.3 KiB
JavaScript
86 lines
2.3 KiB
JavaScript
import { h, options, createContext } from 'preact';
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import { useRef } from 'preact/hooks';
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import { rawStore as store } from './store';
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import { componentPrefix } from './constants';
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// Main context.
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const context = createContext( {} );
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// WordPress Directives.
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const directiveMap = {};
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export const directive = ( name, cb ) => {
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directiveMap[ name ] = cb;
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};
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// WordPress Components.
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const componentMap = {};
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export const component = ( name, Comp ) => {
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componentMap[ name ] = Comp;
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};
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// Resolve the path to some property of the store object.
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const resolve = ( path, context ) => {
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let current = { ...store, context };
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path.split( '.' ).forEach( ( p ) => ( current = current[ p ] ) );
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return current;
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};
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// Generate the evaluate function.
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const getEvaluate =
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( { ref } = {} ) =>
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( path, extraArgs = {} ) => {
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const value = resolve( path, extraArgs.context );
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return typeof value === 'function'
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? value( {
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state: store.state,
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...( ref !== undefined ? { ref } : {} ),
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...extraArgs,
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} )
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: value;
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};
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// Directive wrapper.
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const Directive = ( { type, directives, props: originalProps } ) => {
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const ref = useRef( null );
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const element = h( type, { ...originalProps, ref, _wrapped: true } );
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const props = { ...originalProps, children: element };
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const evaluate = getEvaluate( { ref: ref.current } );
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const directiveArgs = { directives, props, element, context, evaluate };
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for ( const d in directives ) {
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const wrapper = directiveMap[ d ]?.( directiveArgs );
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if ( wrapper !== undefined ) props.children = wrapper;
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}
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return props.children;
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};
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// Preact Options Hook called each time a vnode is created.
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const old = options.vnode;
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options.vnode = ( vnode ) => {
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const type = vnode.type;
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const { directives } = vnode.props;
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if (
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typeof type === 'string' &&
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type.slice( 0, componentPrefix.length ) === componentPrefix
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) {
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vnode.props.children = h(
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componentMap[ type.slice( componentPrefix.length ) ],
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{ ...vnode.props, context, evaluate: getEvaluate() },
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vnode.props.children
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);
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} else if ( directives ) {
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const props = vnode.props;
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delete props.directives;
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if ( ! props._wrapped ) {
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vnode.props = { type: vnode.type, directives, props };
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vnode.type = Directive;
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} else {
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delete props._wrapped;
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}
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}
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if ( old ) old( vnode );
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};
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