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<?php |
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/* this file is part of pipelines */ |
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namespace Ktomk\Pipelines; |
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use UnexpectedValueException; |
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class Lib |
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{ |
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public static function r(&$v, $d) |
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{ |
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if (isset($v)) { |
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return $v; |
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} |
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return $d; |
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} |
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/** |
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* @param mixed $v variable reference |
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* @param mixed $d [optional] default value (null) |
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* @return void |
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*/ |
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public static function v(&$v, $d = null) |
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{ |
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if (!isset($v)) { |
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$v = $d; |
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} |
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} |
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/** |
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* @return string UUID version 4 |
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*/ |
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public static function generateUuid() |
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{ |
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return sprintf( |
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'%04x%04x-%04x-%04x-%04x-%04x%04x%04x', |
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// 32 bits for "time_low" |
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mt_rand(0, 0xffff), |
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mt_rand(0, 0xffff), |
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// 16 bits for "time_mid" |
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mt_rand(0, 0xffff), |
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// 16 bits for "time_hi_and_version", |
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// four most significant bits holds version number 4 |
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mt_rand(0, 0x0fff) | 0x4000, |
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// 16 bits, 8 bits for "clk_seq_hi_res", |
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// 8 bits for "clk_seq_low", |
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// two most significant bits holds zero and one for variant DCE1.1 |
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mt_rand(0, 0x3fff) | 0x8000, |
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// 48 bits for "node" |
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mt_rand(0, 0xffff), |
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mt_rand(0, 0xffff), |
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mt_rand(0, 0xffff) |
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); |
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} |
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/** |
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* @param string $command |
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* @param array|string[] $arguments |
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* @return string |
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*/ |
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public static function cmd($command, array $arguments) |
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{ |
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$buffer = $command; |
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$arguments = call_user_func_array('self::merge', $arguments); |
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foreach ($arguments as $argument) { |
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$buffer .= ' ' . self::quoteArg($argument); |
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} |
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return $buffer; |
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} |
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/** |
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* quote an argument to preserve its value verbatim when used as |
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* a utility argument in shell |
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* |
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* @param string $argument |
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* @return string |
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*/ |
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public static function quoteArg($argument) |
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{ |
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$parts = explode("'", $argument); |
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$buffer = ''; |
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foreach ($parts as $index => $part) { |
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$index && $buffer .= "\\'"; |
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$safe = preg_match('~^[a-zA-Z0-9,._+@%/-]*$~', $part); |
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$buffer .= $safe ? $part : "'${part}'"; |
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} |
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if ('' === $buffer) { |
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$buffer = "''"; |
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} |
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return $buffer; |
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} |
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/** |
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* Turn multi-line string into an array of lines. |
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* |
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* Handles no newline at the end of buffer |
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* |
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* @param string $buffer |
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* @return array|string[] |
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*/ |
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public static function lines($buffer) |
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{ |
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$lines = explode("\n", $buffer); |
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if ($c = count($lines) and '' === $lines[$c - 1]) { |
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array_pop($lines); |
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} |
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return $lines; |
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} |
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/** |
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* merge n parameters, if a scalar, turned into array, otherwise must be an array |
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*/ |
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public static function merge() |
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{ |
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if (!$arrays = func_get_args()) { |
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return $arrays; |
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} |
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foreach ($arrays as $key => $value) { |
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if (!is_array($value)) { |
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$arrays[$key] = (array)$value; |
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} |
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} |
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return call_user_func_array('array_merge', $arrays); |
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} |
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/** |
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* Chunk an array of strings based on maximum string length per chunk |
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* |
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* @param array|string[] $array |
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* @param $maxLength |
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* @param int $overHeadPerEntry |
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* @return array|array[] |
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*/ |
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public static function arrayChunkByStringLength(array $array, $maxLength, $overHeadPerEntry = 0) |
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{ |
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$chunks = array(); |
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$chunkStringLength = 0; |
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$chunk = array(); |
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foreach ($array as $key => $value) { |
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$entryLen = strlen($value) + $overHeadPerEntry; |
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if ($chunkStringLength + $entryLen > $maxLength) { |
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if (empty($chunk)) { |
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throw new \InvalidArgumentException( |
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sprintf( |
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'maximum length of %d is too little to chunk the array at %s %s (%d chunk(s) so far)', |
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$maxLength, |
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is_string($key) ? 'key' : 'index', |
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is_string($key) ? var_export($key, true) : (int)$key, |
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count($chunks) |
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) |
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); |
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} |
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$chunks[] = $chunk; |
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$chunk = array(); |
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$chunkStringLength = 0; |
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} |
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$chunk[] = $value; |
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$chunkStringLength += $entryLen; |
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} |
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if (!empty($chunk)) { |
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$chunks[] = $chunk; |
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} |
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return $chunks; |
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} |
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/** |
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* Get shell environment variables only from $_SERVER in PHP CLI |
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* |
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* Filter an array like $_SERVER in PHP CLI shell for environment |
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* variables only. |
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* |
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* @param array $server |
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* @return array|string[] |
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*/ |
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public static function env(array $server) |
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{ |
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return array_filter( |
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// Pipelines must not support environment variable names with '=' in them |
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array_flip(preg_grep('~=~', array_keys($server))) |
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// What PHP might have added |
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+ array( |
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'PHP_SELF' => null, |
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'SCRIPT_NAME' => null, |
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'SCRIPT_FILENAME' => null, |
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'PATH_TRANSLATED' => null, |
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'DOCUMENT_ROOT' => null, |
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'REQUEST_TIME_FLOAT' => null, |
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'REQUEST_TIME' => null, |
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'argv' => null, |
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'argc' => null, |
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) |
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+ $server, |
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'is_string' |
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); |
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} |
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/** |
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* fallback for the php 5.3 version which does not have PHP_BINARY. |
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* |
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* @return string |
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*/ |
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public static function phpBinary() |
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{ |
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return defined('PHP_BINARY') ? constant('PHP_BINARY') : PHP_BINDIR . '/php'; |
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} |
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} |
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ktomk /
pipelines
