<?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:----NDM0NDY2MTYzNTE3NjI5MCA4MTI3OTYzMTIyOTQyODM1IDY5OTAxMjA0NDMyNzg1NzM=