<?php

namespace DI\Definition\Source;

use DI\Definition\Definition;

/**
 * Reads DI definitions from a PHP array.
 *
 * @author Matthieu Napoli <matthieu@mnapoli.fr>
 */
class DefinitionArray implements DefinitionSource, MutableDefinitionSource
{
    const WILDCARD = '*';

    /** Matches anything except "\". */
    const WILDCARD_PATTERN = '([^\\\\]+)';

    /**
     * DI definitions in a PHP array.
     * @var array
     */
    private $definitions = [];

    /**
     * Cache of wildcard definitions.
     * @var array|null
     */
    private $wildcardDefinitions;

    /** @var DefinitionNormalizer */
    private $normalizer;

    public function __construct(array $definitions = [], Autowiring $autowiring = null)
    {
        if (isset($definitions[0])) {
            throw new \Exception('The PHP-DI definition is not indexed by an entry name in the definition array');
        }

        $this->definitions = $definitions;

        $autowiring = $autowiring ?: new NoAutowiring;
        $this->normalizer = new DefinitionNormalizer($autowiring);
    }

    /**
     * @param array $definitions DI definitions in a PHP array indexed by the definition name.
     */
    public function addDefinitions(array $definitions)
    {
        if (isset($definitions[0])) {
            throw new \Exception('The PHP-DI definition is not indexed by an entry name in the definition array');
        }

        // The newly added data prevails
        // "for keys that exist in both arrays, the elements from the left-hand array will be used"
        $this->definitions = $definitions + $this->definitions;

        // Clear cache
        $this->wildcardDefinitions = null;
    }

    /**
     * {@inheritdoc}
     */
    public function addDefinition(Definition $definition)
    {
        $this->definitions[$definition->getName()] = $definition;

        // Clear cache
        $this->wildcardDefinitions = null;
    }

    public function getDefinition(string $name)
    {
        // Look for the definition by name
        if (array_key_exists($name, $this->definitions)) {
            $definition = $this->definitions[$name];
            $definition = $this->normalizer->normalizeRootDefinition($definition, $name);

            return $definition;
        }

        // Build the cache of wildcard definitions
        if ($this->wildcardDefinitions === null) {
            $this->wildcardDefinitions = [];
            foreach ($this->definitions as $key => $definition) {
                if (strpos($key, self::WILDCARD) !== false) {
                    $this->wildcardDefinitions[$key] = $definition;
                }
            }
        }

        // Look in wildcards definitions
        foreach ($this->wildcardDefinitions as $key => $definition) {
            // Turn the pattern into a regex
            $key = preg_quote($key);
            $key = '#' . str_replace('\\' . self::WILDCARD, self::WILDCARD_PATTERN, $key) . '#';
            if (preg_match($key, $name, $matches) === 1) {
                array_shift($matches);
                $definition = $this->normalizer->normalizeRootDefinition($definition, $name, $matches);

                return $definition;
            }
        }

        return null;
    }

    public function getDefinitions(): array
    {
        // Return all definitions except wildcard definitions
        $definitions = [];
        foreach ($this->definitions as $key => $definition) {
            if (strpos($key, self::WILDCARD) === false) {
                $definitions[$key] = $definition;
            }
        }

        return $definitions;
    }
}
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