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<?php |
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/* this file is part of pipelines */ |
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namespace Ktomk\Pipelines\Cli; |
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/** |
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* For the standard streams used in the CLI application, output |
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* to both standard output and standard error is available in |
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* an encapsulated manner. |
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* |
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* @package Ktomk\Pipelines\Cli |
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*/ |
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class Streams |
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{ |
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/** |
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* @var array |
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*/ |
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private $handles; |
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/** |
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* Create streams from environment (standard streams) |
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* |
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* @return Streams |
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*/ |
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public static function create() |
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{ |
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// PHP Doc Bug #43283 CLI does not define STDOUT/STDERR with stdin script |
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$care = !defined('STDIN'); |
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$in = $care ? constant('STDIN') : 'php://stdin'; |
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$out = $care ? constant('STDOUT') : 'php://stdout'; |
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$err = $care ? constant('STDERR') : 'php://stderr'; |
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return new self($in, $out, $err); |
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} |
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/** |
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* Streams constructor. |
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* |
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* handles can be null (noop), a resource (reuse) or a string that |
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* is opened before use (currently on creation, could be postponed) |
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* |
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* @param null|resource|string $in |
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* @param null|resource|string $out |
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* @param null|resource|string $err |
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*/ |
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public function __construct($in = null, $out = null, $err = null) |
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{ |
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$this->handles = array(); |
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$this->addHandle($in); |
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$this->addHandle($out); |
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$this->addHandle($err); |
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} |
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public function __destruct() |
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{ |
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foreach ($this->handles as $handle => $descriptor) { |
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list($resource, $context) = $descriptor; |
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if ($resource && is_string($context) && is_resource($resource)) { |
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fclose($resource); |
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$this->handles[$handle][0] = null; |
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} |
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} |
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} |
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/** |
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* @param string $string |
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* |
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* @return void |
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*/ |
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public function __invoke($string) |
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{ |
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$this->out(sprintf("%s\n", $string)); |
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} |
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/** |
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* @param string $string |
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* |
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* @return void |
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*/ |
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public function out($string) |
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{ |
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$handle = $this->handles[1][0]; |
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is_resource($handle) && fwrite($handle, $string); |
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} |
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/** |
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* @param string $string |
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* |
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* @return void |
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*/ |
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public function err($string) |
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{ |
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$handle = $this->handles[2][0]; |
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is_resource($handle) && fwrite($handle, $string); |
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} |
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/** |
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* @param Streams $streams |
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* @param int $handle |
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* |
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* @return void |
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*/ |
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public function copyHandle(Streams $streams, $handle) |
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{ |
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$array = $streams->handles[$handle]; |
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// just in case the resource was opened by streams, remove the |
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// association to the path |
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if (is_resource($array[0])) { |
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$array[1] = null; |
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} |
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$this->handles[$handle] = $array; |
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} |
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/** |
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* @param null|resource|string $context |
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* |
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* @throws \RuntimeException |
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* |
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* @return void |
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*/ |
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7 |
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private function addHandle($context) |
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{ |
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$num = count($this->handles); |
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7 |
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if (null === $context || is_resource($context)) { |
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$new = array( |
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$context, |
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null, |
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); |
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} else { |
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$resource = fopen($context, 0 === $num ? 'r' : 'w'); |
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if (false === $resource) { |
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throw new \RuntimeException(sprintf( |
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"failed to open '%s' for %s", |
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$context, |
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0 === $num ? 'reading' : 'writing' |
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)); |
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} |
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$new = array( |
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$resource, |
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$context, |
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); |
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} |
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6 |
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$this->handles[$num] = $new; |
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6 |
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} |
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} |
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ktomk /
pipelines
