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const npa = require('npm-package-arg')
const semver = require('semver')
class OverrideSet {
constructor ({ overrides, key, parent }) {
this.parent = parent
this.children = new Map()
if (typeof overrides === 'string') {
overrides = { '.': overrides }
}
// change a literal empty string to * so we can use truthiness checks on
// the value property later
if (overrides['.'] === '') {
overrides['.'] = '*'
}
if (parent) {
const spec = npa(key)
if (!spec.name) {
throw new Error(`Override without name: ${key}`)
}
this.name = spec.name
spec.name = ''
this.key = key
this.keySpec = spec.rawSpec === '' ? '' : spec.toString()
this.value = overrides['.'] || this.keySpec
}
for (const [key, childOverrides] of Object.entries(overrides)) {
if (key === '.') {
continue
}
const child = new OverrideSet({
parent: this,
key,
overrides: childOverrides,
})
this.children.set(child.key, child)
}
}
getEdgeRule (edge) {
for (const rule of this.ruleset.values()) {
if (rule.name !== edge.name) {
continue
}
if (rule.keySpec === '' ||
semver.intersects(edge.spec, rule.keySpec)) {
return rule
}
}
return this
}
getNodeRule (node) {
for (const rule of this.ruleset.values()) {
if (rule.name !== node.name) {
continue
}
if (rule.keySpec === '' ||
semver.satisfies(node.version, rule.keySpec) ||
semver.satisfies(node.version, rule.value)) {
return rule
}
}
return this
}
getMatchingRule (node) {
for (const rule of this.ruleset.values()) {
if (rule.name !== node.name) {
continue
}
if (rule.keySpec === '' ||
semver.satisfies(node.version, rule.keySpec) ||
semver.satisfies(node.version, rule.value)) {
return rule
}
}
return null
}
* ancestry () {
for (let ancestor = this; ancestor; ancestor = ancestor.parent) {
yield ancestor
}
}
get isRoot () {
return !this.parent
}
get ruleset () {
const ruleset = new Map()
for (const override of this.ancestry()) {
for (const kid of override.children.values()) {
if (!ruleset.has(kid.key)) {
ruleset.set(kid.key, kid)
}
}
if (!override.isRoot && !ruleset.has(override.key)) {
ruleset.set(override.key, override)
}
}
return ruleset
}
}
module.exports = OverrideSet
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