epubavocado/lib/esm/models/mixins/entity.js

I am an EPUB object model aspiring to be standards compliant.

import { select, selectAll } from '../../xpath.js';
export class Entity {
    constructor(node, context) {
        this._node = node;
        this._context = context || this;
    }
    _select(expression) {
        return select(expression, this._node);
    }
    _selectAll(expression) {
        return selectAll(expression, this._node);
    }
    _resolve(expression, constructor) {
        const node = this._select(expression);
        if (!node) {
            return null;
        }
        if (constructor) {
            return new constructor(node, this._context);
        }
        const attrType = node;
        const nodeType = node;
        if (attrType.value) {
            return attrType.value;
        }
        if (nodeType.nodeValue) {
            return nodeType.nodeValue;
        }
    }
    _resolveAll(expression, constructor) {
        const nodes = this._selectAll(expression);
        if (!nodes) {
            return [];
        }
        if (constructor) {
            return nodes.map((node) => new constructor(node, this._context));
        }
        return nodes.map((node) => node.nodeValue);
    }
}