ComposerJson.php
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ComposerJson.php
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	<?php

	namespace Wikimedia\Composer;

	/**
	* Reads a composer.json file and provides accessors to get
	* its hash and the required dependencies
	*
	* @since 1.25
	*/
	class ComposerJson {
	/**
	* @var array[]
	*/
	private $contents;

	/**
	* @param string $location
	*/
	public function __construct( $location ) {
	$this->contents = json_decode( file_get_contents( $location ), true );
	}

	/**
	* Dependencies as specified by composer.json
	*
	* @return string[]
	*/
	public function getRequiredDependencies() {
	$deps = [];
	if ( isset( $this->contents['require'] ) ) {
	foreach ( $this->contents['require'] as $package => $version ) {
	// Examples of package dependencies that don't have a / in the name:
	// php, ext-xml, composer-plugin-api
	if ( strpos( $package, '/' ) !== false ) {
	$deps[$package] = self::normalizeVersion( $version );
	}
	}
	}

	return $deps;
	}

	/**
	* Strip a leading "v" from the version name
	*
	* @param string $version
	* @return string
	*/
	public static function normalizeVersion( $version ) {
	// Composer auto-strips the "v" in front of the tag name
	return ltrim( $version, 'v' );
	}

	}