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Filename :
link.js
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const relpath = require('./relpath.js') const Node = require('./node.js') const _loadDeps = Symbol.for('Arborist.Node._loadDeps') const _target = Symbol.for('_target') const { dirname } = require('path') // defined by Node class const _delistFromMeta = Symbol.for('_delistFromMeta') const _refreshLocation = Symbol.for('_refreshLocation') class Link extends Node { constructor (options) { const { root, realpath, target, parent, fsParent, isStoreLink } = options if (!realpath && !(target && target.path)) { throw new TypeError('must provide realpath for Link node') } super({ ...options, realpath: realpath || target.path, root: root || (parent ? parent.root : fsParent ? fsParent.root : target ? target.root : null), }) this.isStoreLink = isStoreLink || false if (target) { this.target = target } else if (this.realpath === this.root.path) { this.target = this.root } else { this.target = new Node({ ...options, path: realpath, parent: null, fsParent: null, root: this.root, }) } } get version () { return this.target ? this.target.version : this.package.version || '' } get target () { return this[_target] } set target (target) { const current = this[_target] if (target === current) { return } if (!target) { if (current && current.linksIn) { current.linksIn.delete(this) } if (this.path) { this[_delistFromMeta]() this[_target] = null this.package = {} this[_refreshLocation]() } else { this[_target] = null } return } if (!this.path) { // temp node pending assignment to a tree // we know it's not in the inventory yet, because no path. if (target.path) { this.realpath = target.path } else { target.path = target.realpath = this.realpath } target.root = this.root this[_target] = target target.linksIn.add(this) this.package = target.package return } // have to refresh metadata, because either realpath or package // is very likely changing. this[_delistFromMeta]() this.package = target.package this.realpath = target.path this[_refreshLocation]() target.root = this.root } // a link always resolves to the relative path to its target get resolved () { // the path/realpath guard is there for the benefit of setting // these things in the "wrong" order return this.path && this.realpath ? `file:${relpath(dirname(this.path), this.realpath).replace(/#/g, '%23')}` : null } set resolved (r) {} // deps are resolved on the target, not the Link // so this is a no-op [_loadDeps] () {} // links can't have children, only their targets can // fix it to an empty list so that we can still call // things that iterate over them, just as a no-op get children () { return new Map() } set children (c) {} get isLink () { return true } } module.exports = Link