vendor/incenteev/composer-parameter-handler/Processor.php

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<?php

namespace Incenteev\ParameterHandler;

use Composer\IO\IOInterface;
use Symfony\Component\Yaml\Inline;
use Symfony\Component\Yaml\Parser;
use Symfony\Component\Yaml\Yaml;

class Processor
{
    private $io;

    public function __construct(IOInterface $io)
    {
        $this->io = $io;
    }

    public function processFile(array $config)
    {
        $config = $this->processConfig($config);

        $realFile = $config['file'];
        $parameterKey = $config['parameter-key'];

        $exists = is_file($realFile);

        $yamlParser = new Parser();

        $action = $exists ? 'Updating' : 'Creating';
        $this->io->write(sprintf('<info>%s the "%s" file</info>', $action, $realFile));

        // Find the expected params
        $expectedValues = $yamlParser->parse(file_get_contents($config['dist-file']));
        if (!isset($expectedValues[$parameterKey])) {
            throw new \InvalidArgumentException(sprintf('The top-level key %s is missing.', $parameterKey));
        }
        $expectedParams = (array) $expectedValues[$parameterKey];

        // find the actual params
        $actualValues = array_merge(
            // Preserve other top-level keys than `$parameterKey` in the file
            $expectedValues,
            array($parameterKey => array())
        );
        if ($exists) {
            $existingValues = $yamlParser->parse(file_get_contents($realFile));
            if ($existingValues === null) {
                $existingValues = array();
            }
            if (!is_array($existingValues)) {
                throw new \InvalidArgumentException(sprintf('The existing "%s" file does not contain an array', $realFile));
            }
            $actualValues = array_merge($actualValues, $existingValues);
        }

        $actualValues[$parameterKey] = $this->processParams($config, $expectedParams, (array) $actualValues[$parameterKey]);

        if (!is_dir($dir = dirname($realFile))) {
            mkdir($dir, 0755, true);