| 'use strict'; |
| |
| var has = require('has'); |
| |
| function specifierIncluded(current, specifier) { |
| var nodeParts = current.split('.'); |
| var parts = specifier.split(' '); |
| var op = parts.length > 1 ? parts[0] : '='; |
| var versionParts = (parts.length > 1 ? parts[1] : parts[0]).split('.'); |
| |
| for (var i = 0; i < 3; ++i) { |
| var cur = parseInt(nodeParts[i] || 0, 10); |
| var ver = parseInt(versionParts[i] || 0, 10); |
| if (cur === ver) { |
| continue; // eslint-disable-line no-restricted-syntax, no-continue |
| } |
| if (op === '<') { |
| return cur < ver; |
| } |
| if (op === '>=') { |
| return cur >= ver; |
| } |
| return false; |
| } |
| return op === '>='; |
| } |
| |
| function matchesRange(current, range) { |
| var specifiers = range.split(/ ?&& ?/); |
| if (specifiers.length === 0) { |
| return false; |
| } |
| for (var i = 0; i < specifiers.length; ++i) { |
| if (!specifierIncluded(current, specifiers[i])) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| function versionIncluded(nodeVersion, specifierValue) { |
| if (typeof specifierValue === 'boolean') { |
| return specifierValue; |
| } |
| |
| var current = typeof nodeVersion === 'undefined' |
| ? process.versions && process.versions.node && process.versions.node |
| : nodeVersion; |
| |
| if (typeof current !== 'string') { |
| throw new TypeError(typeof nodeVersion === 'undefined' ? 'Unable to determine current node version' : 'If provided, a valid node version is required'); |
| } |
| |
| if (specifierValue && typeof specifierValue === 'object') { |
| for (var i = 0; i < specifierValue.length; ++i) { |
| if (matchesRange(current, specifierValue[i])) { |
| return true; |
| } |
| } |
| return false; |
| } |
| return matchesRange(current, specifierValue); |
| } |
| |
| var data = require('./core.json'); |
| |
| module.exports = function isCore(x, nodeVersion) { |
| return has(data, x) && versionIncluded(nodeVersion, data[x]); |
| }; |