1 files changed, 181 insertions, 0 deletions
diff --git a/vendor/wikimedia/composer-merge-plugin/src/Merge/StabilityFlags.php b/vendor/wikimedia/composer-merge-plugin/src/Merge/StabilityFlags.php
new file mode 100644
index 00000000..1c106e02
--- /dev/null
+++ b/vendor/wikimedia/composer-merge-plugin/src/Merge/StabilityFlags.php
@@ -0,0 +1,181 @@
+<?php
+/**
+ * This file is part of the Composer Merge plugin.
+ *
+ * Copyright (C) 2015 Bryan Davis, Wikimedia Foundation, and contributors
+ *
+ * This software may be modified and distributed under the terms of the MIT
+ * license. See the LICENSE file for details.
+ */
+
+namespace Wikimedia\Composer\Merge;
+
+use Composer\Package\BasePackage;
+use Composer\Package\Version\VersionParser;
+
+/**
+ * Adapted from Composer's RootPackageLoader::extractStabilityFlags
+ * @author Bryan Davis <bd808@bd808.com>
+ */
+class StabilityFlags
+{
+
+    /**
+     * @var array Current package name => stability mappings
+     */
+    protected $stabilityFlags;
+
+    /**
+     * @var int Current default minimum stability
+     */
+    protected $minimumStability;
+
+    /**
+     * @var string Regex to extract an explict stability flag (eg '@dev')
+     */
+    protected $explicitStabilityRe;
+
+
+    /**
+     * @param array $stabilityFlags Current package name => stability mappings
+     * @param int $minimumStability Current default minimum stability
+     */
+    public function __construct(
+        array $stabilityFlags = array(),
+        $minimumStability = BasePackage::STABILITY_STABLE
+    ) {
+        $this->stabilityFlags = $stabilityFlags;
+        $this->minimumStability = $this->getStabilityInt($minimumStability);
+        $this->explicitStabilityRe = '/^[^@]*?@(' .
+            implode('|', array_keys(BasePackage::$stabilities)) .
+            ')$/i';
+    }
+
+    /**
+     * Get the stability value for a given string.
+     *
+     * @param string $name Stability name
+     * @return int Stability value
+     */
+    protected function getStabilityInt($name)
+    {
+        $name = VersionParser::normalizeStability($name);
+        return isset(BasePackage::$stabilities[$name]) ?
+            BasePackage::$stabilities[$name] :
+            BasePackage::STABILITY_STABLE;
+    }
+
+    /**
+     * Extract and merge stability flags from the given collection of
+     * requires with another collection of stability flags.
+     *
+     * @param array $requires New package name => link mappings
+     * @return array Unified package name => stability mappings
+     */
+    public function extractAll(array $requires)
+    {
+        $flags = array();
+
+        foreach ($requires as $name => $link) {
+            $name = strtolower($name);
+            $version = $link->getPrettyConstraint();
+
+            $stability = $this->getExplicitStability($version);
+
+            if ($stability === null) {
+                $stability = $this->getParsedStability($version);
+            }
+
+            $flags[$name] = max($stability, $this->getCurrentStability($name));
+        }
+
+        // Filter out null stability values
+        return array_filter($flags, function ($v) {
+            return $v !== null;
+        });
+    }
+
+
+    /**
+     * Extract the most unstable explicit stability (eg '@dev') from a version
+     * specification.
+     *
+     * @param string $version
+     * @return int|null Stability or null if no explict stability found
+     */
+    protected function getExplicitStability($version)
+    {
+        $found = null;
+        $constraints = $this->splitConstraints($version);
+        foreach ($constraints as $constraint) {
+            if (preg_match($this->explicitStabilityRe, $constraint, $match)) {
+                $stability = $this->getStabilityInt($match[1]);
+                $found = max($stability, $found);
+            }
+        }
+        return $found;
+    }
+
+
+    /**
+     * Split a version specification into a list of version constraints.
+     *
+     * @param string $version
+     * @return array
+     */
+    protected function splitConstraints($version)
+    {
+        $found = array();
+        $orConstraints = preg_split('/\s*\|\|?\s*/', trim($version));
+        foreach ($orConstraints as $constraints) {
+            $andConstraints = preg_split(
+                '/(?<!^|as|[=>< ,]) *(?<!-)[, ](?!-) *(?!,|as|$)/',
+                $constraints
+            );
+            foreach ($andConstraints as $constraint) {
+                $found[] = $constraint;
+            }
+        }
+        return $found;
+    }
+
+
+    /**
+     * Get the stability of a version
+     *
+     * @param string $version
+     * @return int|null Stability or null if STABLE or less than minimum
+     */
+    protected function getParsedStability($version)
+    {
+        // Drop aliasing if used
+        $version = preg_replace('/^([^,\s@]+) as .+$/', '$1', $version);
+        $stability = $this->getStabilityInt(
+            VersionParser::parseStability($version)
+        );
+
+        if ($stability === BasePackage::STABILITY_STABLE ||
+            $this->minimumStability > $stability
+        ) {
+            // Ignore if 'stable' or more stable than the global
+            // minimum
+            $stability = null;
+        }
+
+        return $stability;
+    }
+
+
+    /**
+     * Get the current stability of a given package.
+     *
+     * @param string $name
+     * @return int|null Stability of null if not set
+     */
+    protected function getCurrentStability($name)
+    {
+        return isset($this->stabilityFlags[$name]) ?
+            $this->stabilityFlags[$name] : null;
+    }
+}
+// vim:sw=4:ts=4:sts=4:et: