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85 lines
3.7 KiB
PHP
85 lines
3.7 KiB
PHP
<?php
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/**
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* This file is part of the Composer Merge plugin.
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*
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* Copyright (C) 2021 Bryan Davis, Wikimedia Foundation, and contributors
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*
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* This software may be modified and distributed under the terms of the MIT
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* license. See the LICENSE file for details.
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*/
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namespace Wikimedia\Composer\Merge\V2;
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use Composer\Semver\Constraint\ConstraintInterface;
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use Composer\Semver\Constraint\EmptyConstraint;
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use Composer\Semver\Constraint\MultiConstraint as SemverMultiConstraint;
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use function count;
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/**
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* Adapted from Composer's v2 MultiConstraint::create for Composer v1
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* @link https://github.com/composer/semver/blob/3.2.4/src/Constraint/MultiConstraint.php
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* @author Chauncey McAskill <chauncey@mcaskill.ca>
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*/
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class MultiConstraint extends SemverMultiConstraint
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{
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/**
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* Tries to optimize the constraints as much as possible, meaning
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* reducing/collapsing congruent constraints etc.
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* Does not necessarily return a MultiConstraint instance if
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* things can be reduced to a simple constraint
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*
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* @param ConstraintInterface[] $constraints A set of constraints
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* @param bool $conjunctive Whether the constraints should be treated as conjunctive or disjunctive
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*
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* @return ConstraintInterface
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*/
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public static function create(array $constraints, $conjunctive = \true)
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{
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if (count($constraints) === 0) {
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// EmptyConstraint only exists in composer 1.x. Configure as to run phan against composer 2.x
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// @phan-suppress-next-line PhanTypeMismatchReturn, PhanUndeclaredClassMethod
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return new EmptyConstraint();
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}
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if (count($constraints) === 1) {
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return $constraints[0];
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}
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$optimized = self::optimizeConstraints($constraints, $conjunctive);
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if ($optimized !== null) {
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list($constraints, $conjunctive) = $optimized;
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if (count($constraints) === 1) {
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return $constraints[0];
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}
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}
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return new self($constraints, $conjunctive);
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}
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/**
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* @return array|null
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*/
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private static function optimizeConstraints(array $constraints, $conjunctive)
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{
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// parse the two OR groups and if they are contiguous we collapse
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// them into one constraint
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// [>= 1 < 2] || [>= 2 < 3] || [>= 3 < 4] => [>= 1 < 4]
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if (!$conjunctive) {
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$left = $constraints[0];
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$mergedConstraints = [];
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$optimized = \false;
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for ($i = 1, $l = count($constraints); $i < $l; $i++) {
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$right = $constraints[$i];
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if ($left instanceof SemverMultiConstraint && $left->conjunctive && $right instanceof SemverMultiConstraint && $right->conjunctive && count($left->constraints) === 2 && count($right->constraints) === 2 && ($left0 = (string) $left->constraints[0]) && $left0[0] === '>' && $left0[1] === '=' && ($left1 = (string) $left->constraints[1]) && $left1[0] === '<' && ($right0 = (string) $right->constraints[0]) && $right0[0] === '>' && $right0[1] === '=' && ($right1 = (string) $right->constraints[1]) && $right1[0] === '<' && substr($left1, 2) === substr($right0, 3)) {
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$optimized = \true;
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$left = new \Wikimedia\Composer\Merge\V2\MultiConstraint([$left->constraints[0], $right->constraints[1]], \true);
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} else {
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$mergedConstraints[] = $left;
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$left = $right;
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}
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}
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if ($optimized) {
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$mergedConstraints[] = $left;
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return [$mergedConstraints, \false];
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}
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}
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// TODO: Here's the place to put more optimizations
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return null;
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}
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}
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// vim:sw=4:ts=4:sts=4:et:
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