guoyao-jiankang/public/static/threejs135/jsm/renderers/nodes/utils/SplitNode.js

import Node from '../core/Node.js';

class SplitNode extends Node {

	constructor( node, components = 'x' ) {

		super();

		this.node = node;
		this.components = components;

	}

	getNodeType( builder ) {

		return builder.getTypeFromLength( this.components.length );

	}

	generate( builder ) {

		const node = this.node;
		const nodeTypeLength = builder.getTypeLength( node.getNodeType( builder ) );

		if ( nodeTypeLength > 1 ) {

			const components = this.components;

			let type = null;

			if ( components.length >= nodeTypeLength ) {

				// need expand the input node

				type = this.getNodeType( builder );

			}

			const nodeSnippet = node.build( builder, type );

			return `${nodeSnippet}.${this.components}`;

		} else {

			// ignore components if node is a float

			return node.build( builder );

		}

	}

}

export default SplitNode;