ember-legacy-class-transform/.node_modules.ember-try/@glimmer/object-reference/dist/commonjs/es2017/lib/references/path.js

The default blueprint for ember-cli addons.

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.PathReference = undefined;

var _utils = require('../utils');

var _util = require('@glimmer/util');

var _meta = require('../meta');

var _meta2 = _interopRequireDefault(_meta);

var _descriptors = require('./descriptors');

var _reference = require('@glimmer/reference');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

class PathReference {
    constructor(parent, property) {
        this.cache = _utils.EMPTY_CACHE;
        this.inner = null;
        this.chains = null;
        this.lastParentValue = _utils.EMPTY_CACHE;
        this._guid = 0;
        this.tag = _reference.VOLATILE_TAG;
        this.parent = parent;
        this.property = property;
    }
    value() {
        let { lastParentValue, property, inner } = this;
        let parentValue = this._parentValue();
        if (parentValue === null || parentValue === undefined) {
            return this.cache = undefined;
        }
        if (lastParentValue === parentValue) {
            inner = this.inner;
        } else {
            let ReferenceType = typeof parentValue === 'object' ? _meta2.default.for(parentValue).referenceTypeFor(property) : _descriptors.PropertyReference;
            inner = this.inner = new ReferenceType(parentValue, property, this);
        }
        // if (typeof parentValue === 'object') {
        //   Meta.for(parentValue).addReference(property, this);
        // }
        return this.cache = inner.value();
    }
    get(prop) {
        let chains = this._getChains();
        if (prop in chains) return chains[prop];
        return chains[prop] = new PathReference(this, prop);
    }
    label() {
        return '[reference Direct]';
    }
    _getChains() {
        if (this.chains) return this.chains;
        return this.chains = (0, _util.dict)();
    }
    _parentValue() {
        let parent = this.parent.value();
        this.lastParentValue = parent;
        return parent;
    }
}
exports.default = PathReference;
exports.PathReference = PathReference;
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