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/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
*/
'use strict';
var invariant = require("./invariant");
var componentRegex = /\./;
var orRegex = /\|\|/;
var rangeRegex = /\s+\-\s+/;
var modifierRegex = /^(<=|<|=|>=|~>|~|>|)?\s*(.+)/;
var numericRegex = /^(\d*)(.*)/;
/**
* Splits input `range` on "||" and returns true if any subrange matches
* `version`.
*
* @param {string} range
* @param {string} version
* @returns {boolean}
*/
function checkOrExpression(range, version) {
var expressions = range.split(orRegex);
if (expressions.length > 1) {
return expressions.some(function (range) {
return VersionRange.contains(range, version);
});
} else {
range = expressions[0].trim();
return checkRangeExpression(range, version);
}
}
/**
* Splits input `range` on " - " (the surrounding whitespace is required) and
* returns true if version falls between the two operands.
*
* @param {string} range
* @param {string} version
* @returns {boolean}
*/
function checkRangeExpression(range, version) {
var expressions = range.split(rangeRegex);
!(expressions.length > 0 && expressions.length <= 2) ? process.env.NODE_ENV !== "production" ? invariant(false, 'the "-" operator expects exactly 2 operands') : invariant(false) : void 0;
if (expressions.length === 1) {
return checkSimpleExpression(expressions[0], version);
} else {
var startVersion = expressions[0],
endVersion = expressions[1];
!(isSimpleVersion(startVersion) && isSimpleVersion(endVersion)) ? process.env.NODE_ENV !== "production" ? invariant(false, 'operands to the "-" operator must be simple (no modifiers)') : invariant(false) : void 0;
return checkSimpleExpression('>=' + startVersion, version) && checkSimpleExpression('<=' + endVersion, version);
}
}
/**
* Checks if `range` matches `version`. `range` should be a "simple" range (ie.
* not a compound range using the " - " or "||" operators).
*
* @param {string} range
* @param {string} version
* @returns {boolean}
*/
function checkSimpleExpression(range, version) {
range = range.trim();
if (range === '') {
return true;
}
var versionComponents = version.split(componentRegex);
var _getModifierAndCompon = getModifierAndComponents(range),
modifier = _getModifierAndCompon.modifier,
rangeComponents = _getModifierAndCompon.rangeComponents;
switch (modifier) {
case '<':
return checkLessThan(versionComponents, rangeComponents);
case '<=':
return checkLessThanOrEqual(versionComponents, rangeComponents);
case '>=':
return checkGreaterThanOrEqual(versionComponents, rangeComponents);
case '>':
return checkGreaterThan(versionComponents, rangeComponents);
case '~':
case '~>':
return checkApproximateVersion(versionComponents, rangeComponents);
default:
return checkEqual(versionComponents, rangeComponents);
}
}
/**
* Checks whether `a` is less than `b`.
*
* @param {array<string>} a
* @param {array<string>} b
* @returns {boolean}
*/
function checkLessThan(a, b) {
return compareComponents(a, b) === -1;
}
/**
* Checks whether `a` is less than or equal to `b`.
*
* @param {array<string>} a
* @param {array<string>} b
* @returns {boolean}
*/
function checkLessThanOrEqual(a, b) {
var result = compareComponents(a, b);
return result === -1 || result === 0;
}
/**
* Checks whether `a` is equal to `b`.
*
* @param {array<string>} a
* @param {array<string>} b
* @returns {boolean}
*/
function checkEqual(a, b) {
return compareComponents(a, b) === 0;
}
/**
* Checks whether `a` is greater than or equal to `b`.
*
* @param {array<string>} a
* @param {array<string>} b
* @returns {boolean}
*/
function checkGreaterThanOrEqual(a, b) {
var result = compareComponents(a, b);
return result === 1 || result === 0;
}
/**
* Checks whether `a` is greater than `b`.
*
* @param {array<string>} a
* @param {array<string>} b
* @returns {boolean}
*/
function checkGreaterThan(a, b) {
return compareComponents(a, b) === 1;
}
/**
* Checks whether `a` is "reasonably close" to `b` (as described in
* https://www.npmjs.org/doc/misc/semver.html). For example, if `b` is "1.3.1"
* then "reasonably close" is defined as ">= 1.3.1 and < 1.4".
*
* @param {array<string>} a
* @param {array<string>} b
* @returns {boolean}
*/
function checkApproximateVersion(a, b) {
var lowerBound = b.slice();
var upperBound = b.slice();
if (upperBound.length > 1) {
upperBound.pop();
}
var lastIndex = upperBound.length - 1;
var numeric = parseInt(upperBound[lastIndex], 10);
if (isNumber(numeric)) {
upperBound[lastIndex] = numeric + 1 + '';
}
return checkGreaterThanOrEqual(a, lowerBound) && checkLessThan(a, upperBound);
}
/**
* Extracts the optional modifier (<, <=, =, >=, >, ~, ~>) and version
* components from `range`.
*
* For example, given `range` ">= 1.2.3" returns an object with a `modifier` of
* `">="` and `components` of `[1, 2, 3]`.
*
* @param {string} range
* @returns {object}
*/
function getModifierAndComponents(range) {
var rangeComponents = range.split(componentRegex);
var matches = rangeComponents[0].match(modifierRegex);
!matches ? process.env.NODE_ENV !== "production" ? invariant(false, 'expected regex to match but it did not') : invariant(false) : void 0;
return {
modifier: matches[1],
rangeComponents: [matches[2]].concat(rangeComponents.slice(1))
};
}
/**
* Determines if `number` is a number.
*
* @param {mixed} number
* @returns {boolean}
*/
function isNumber(number) {
return !isNaN(number) && isFinite(number);
}
/**
* Tests whether `range` is a "simple" version number without any modifiers
* (">", "~" etc).
*
* @param {string} range
* @returns {boolean}
*/
function isSimpleVersion(range) {
return !getModifierAndComponents(range).modifier;
}
/**
* Zero-pads array `array` until it is at least `length` long.
*
* @param {array} array
* @param {number} length
*/
function zeroPad(array, length) {
for (var i = array.length; i < length; i++) {
array[i] = '0';
}
}
/**
* Normalizes `a` and `b` in preparation for comparison by doing the following:
*
* - zero-pads `a` and `b`
* - marks any "x", "X" or "*" component in `b` as equivalent by zero-ing it out
* in both `a` and `b`
* - marks any final "*" component in `b` as a greedy wildcard by zero-ing it
* and all of its successors in `a`
*
* @param {array<string>} a
* @param {array<string>} b
* @returns {array<array<string>>}
*/
function normalizeVersions(a, b) {
a = a.slice();
b = b.slice();
zeroPad(a, b.length); // mark "x" and "*" components as equal
for (var i = 0; i < b.length; i++) {
var matches = b[i].match(/^[x*]$/i);
if (matches) {
b[i] = a[i] = '0'; // final "*" greedily zeros all remaining components
if (matches[0] === '*' && i === b.length - 1) {
for (var j = i; j < a.length; j++) {
a[j] = '0';
}
}
}
}
zeroPad(b, a.length);
return [a, b];
}
/**
* Returns the numerical -- not the lexicographical -- ordering of `a` and `b`.
*
* For example, `10-alpha` is greater than `2-beta`.
*
* @param {string} a
* @param {string} b
* @returns {number} -1, 0 or 1 to indicate whether `a` is less than, equal to,
* or greater than `b`, respectively
*/
function compareNumeric(a, b) {
var aPrefix = a.match(numericRegex)[1];
var bPrefix = b.match(numericRegex)[1];
var aNumeric = parseInt(aPrefix, 10);
var bNumeric = parseInt(bPrefix, 10);
if (isNumber(aNumeric) && isNumber(bNumeric) && aNumeric !== bNumeric) {
return compare(aNumeric, bNumeric);
} else {
return compare(a, b);
}
}
/**
* Returns the ordering of `a` and `b`.
*
* @param {string|number} a
* @param {string|number} b
* @returns {number} -1, 0 or 1 to indicate whether `a` is less than, equal to,
* or greater than `b`, respectively
*/
function compare(a, b) {
!(typeof a === typeof b) ? process.env.NODE_ENV !== "production" ? invariant(false, '"a" and "b" must be of the same type') : invariant(false) : void 0;
if (a > b) {
return 1;
} else if (a < b) {
return -1;
} else {
return 0;
}
}
/**
* Compares arrays of version components.
*
* @param {array<string>} a
* @param {array<string>} b
* @returns {number} -1, 0 or 1 to indicate whether `a` is less than, equal to,
* or greater than `b`, respectively
*/
function compareComponents(a, b) {
var _normalizeVersions = normalizeVersions(a, b),
aNormalized = _normalizeVersions[0],
bNormalized = _normalizeVersions[1];
for (var i = 0; i < bNormalized.length; i++) {
var result = compareNumeric(aNormalized[i], bNormalized[i]);
if (result) {
return result;
}
}
return 0;
}
var VersionRange = {
/**
* Checks whether `version` satisfies the `range` specification.
*
* We support a subset of the expressions defined in
* https://www.npmjs.org/doc/misc/semver.html:
*
* version Must match version exactly
* =version Same as just version
* >version Must be greater than version
* >=version Must be greater than or equal to version
* <version Must be less than version
* <=version Must be less than or equal to version
* ~version Must be at least version, but less than the next significant
* revision above version:
* "~1.2.3" is equivalent to ">= 1.2.3 and < 1.3"
* ~>version Equivalent to ~version
* 1.2.x Must match "1.2.x", where "x" is a wildcard that matches
* anything
* 1.2.* Similar to "1.2.x", but "*" in the trailing position is a
* "greedy" wildcard, so will match any number of additional
* components:
* "1.2.*" will match "1.2.1", "1.2.1.1", "1.2.1.1.1" etc
* * Any version
* "" (Empty string) Same as *
* v1 - v2 Equivalent to ">= v1 and <= v2"
* r1 || r2 Passes if either r1 or r2 are satisfied
*
* @param {string} range
* @param {string} version
* @returns {boolean}
*/
contains: function contains(range, version) {
return checkOrExpression(range.trim(), version.trim());
}
};
module.exports = VersionRange;
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