<?php

namespace Composer\MetadataMinifier;

class MetadataMinifier
{
    /**
     * Expands an array of minified versions back to their original format
     *
     * @param array[] $versions A list of minified version arrays
     * @return array[] A list of version arrays
     */
    public static function expand(array $versions)
    {
        $expanded = array();
        $expandedVersion = null;
        foreach ($versions as $versionData) {
            if (!$expandedVersion) {
                $expandedVersion = $versionData;
                $expanded[] = $expandedVersion;
                continue;
            }

            // add any changes from the previous version to the expanded one
            foreach ($versionData as $key => $val) {
                if ($val === '__unset') {
                    unset($expandedVersion[$key]);
                } else {
                    $expandedVersion[$key] = $val;
                }
            }

            $expanded[] = $expandedVersion;
        }

        return $expanded;
    }

    /**
     * Minifies an array of versions into a set of version diffs
     *
     * @param array[] $versions A list of version arrays
     * @return array[] A list of versions minified with each array only containing the differences to the previous one
     */
    public static function minify(array $versions)
    {
        $minifiedVersions = array();

        $lastKnownVersionData = null;
        foreach ($versions as $version) {
            if (!$lastKnownVersionData) {
                $lastKnownVersionData = $version;
                $minifiedVersions[] = $version;
                continue;
            }

            $minifiedVersion = array();

            // add any changes from the previous version
            foreach ($version as $key => $val) {
                if (!isset($lastKnownVersionData[$key]) || $lastKnownVersionData[$key] !== $val) {
                    $minifiedVersion[$key] = $val;
                    $lastKnownVersionData[$key] = $val;
                }
            }

            // store any deletions from the previous version for keys missing in current one
            foreach ($lastKnownVersionData as $key => $val) {
                if (!isset($version[$key])) {
                    $minifiedVersion[$key] = "__unset";
                    unset($lastKnownVersionData[$key]);
                }
            }

            $minifiedVersions[] = $minifiedVersion;
        }

        return $minifiedVersions;
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MzgyODg0NzQ4NjE1NTE3NSA2MTEwMTQyMTMzMjE1NDE1IDU5NzgwNTgwNDg3MjkyNjg=