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const debug = require('./debug.js')
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 } = 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),
})
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 (current && current.then) {
debug(() => {
throw Object.assign(new Error('cannot set target while awaiting'), {
path: this.path,
realpath: this.realpath,
})
})
}
if (target && target.then) {
// can set to a promise during an async tree build operation
// wait until then to assign it.
this[_target] = target
target.then(node => {
this[_target] = null
this.target = node
})
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
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