1'use strict';
2
3var hasOwn = require('hasown');
4
5function specifierIncluded(current, specifier) {
6	var nodeParts = current.split('.');
7	var parts = specifier.split(' ');
8	var op = parts.length > 1 ? parts[0] : '=';
9	var versionParts = (parts.length > 1 ? parts[1] : parts[0]).split('.');
10
11	for (var i = 0; i < 3; ++i) {
12		var cur = parseInt(nodeParts[i] || 0, 10);
13		var ver = parseInt(versionParts[i] || 0, 10);
14		if (cur === ver) {
15			continue; // eslint-disable-line no-restricted-syntax, no-continue
16		}
17		if (op === '<') {
18			return cur < ver;
19		}
20		if (op === '>=') {
21			return cur >= ver;
22		}
23		return false;
24	}
25	return op === '>=';
26}
27
28function matchesRange(current, range) {
29	var specifiers = range.split(/ ?&& ?/);
30	if (specifiers.length === 0) {
31		return false;
32	}
33	for (var i = 0; i < specifiers.length; ++i) {
34		if (!specifierIncluded(current, specifiers[i])) {
35			return false;
36		}
37	}
38	return true;
39}
40
41function versionIncluded(nodeVersion, specifierValue) {
42	if (typeof specifierValue === 'boolean') {
43		return specifierValue;
44	}
45
46	var current = typeof nodeVersion === 'undefined'
47		? process.versions && process.versions.node
48		: nodeVersion;
49
50	if (typeof current !== 'string') {
51		throw new TypeError(typeof nodeVersion === 'undefined' ? 'Unable to determine current node version' : 'If provided, a valid node version is required');
52	}
53
54	if (specifierValue && typeof specifierValue === 'object') {
55		for (var i = 0; i < specifierValue.length; ++i) {
56			if (matchesRange(current, specifierValue[i])) {
57				return true;
58			}
59		}
60		return false;
61	}
62	return matchesRange(current, specifierValue);
63}
64
65var data = require('./core.json');
66
67module.exports = function isCore(x, nodeVersion) {
68	return hasOwn(data, x) && versionIncluded(nodeVersion, data[x]);
69};
70