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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: ${key}`) } this.name = spec.name spec.name = '' this.key = key this.keySpec = spec.toString() this.value = overrides['.'] || this.keySpec } for (const [key, childOverrides] of Object.entries(overrides)) { if (key === '.') { continue } const child = new OverrideSet({ parent: this, key, overrides: childOverrides, }) this.children.set(child.key, child) } } getEdgeRule (edge) { for (const rule of this.ruleset.values()) { if (rule.name !== edge.name) { continue } // if keySpec is * we found our override if (rule.keySpec === '*') { return rule } let spec = npa(`${edge.name}@${edge.spec}`) if (spec.type === 'alias') { spec = spec.subSpec } if (spec.type === 'git') { if (spec.gitRange && semver.intersects(spec.gitRange, rule.keySpec)) { return rule } continue } if (spec.type === 'range' || spec.type === 'version') { if (semver.intersects(spec.fetchSpec, rule.keySpec)) { return rule } continue } // if we got this far, the spec type is one of tag, directory or file // which means we have no real way to make version comparisons, so we // just accept the override return rule } return this } getNodeRule (node) { for (const rule of this.ruleset.values()) { if (rule.name !== node.name) { continue } if (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 (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