<?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:----OTY0NDU2NjM1MDcwMTk0OSA4MjA5MjYyOTUxODcyMzcwIDMyMzA0MDQ2MTYwODYxMjI=