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<?php
/*
* This file is part of composer/metadata-minifier.
*
* (c) Composer <https://github.com/composer>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
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;
}
}