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<?php
/**
* Hoa
*
*
* @license
*
* New BSD License
*
* Copyright © 2007-2017, Hoa community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Hoa nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
namespace Psy\Readline\Hoa;
/**
* Build a callable object, i.e. `function`, `class::method`, `object->method` or
* closure. They all have the same behaviour. This callable is an extension of
* native PHP callable (aka callback) to integrate Hoa's structures.
*/
class Xcallable
{
/**
* Callback with the PHP format.
*/
protected $_callback = null;
/**
* Callable hash.
*/
protected $_hash = null;
/**
* Allocates a xcallable based on a callback.
*
* Accepted forms:
* * `'function'`,
* * `'class::method'`,
* * `'class', 'method'`,
* * `$object, 'method'`,
* * `$object, ''`,
* * `function (…) { … }`,
* * `['class', 'method']`,
* * `[$object, 'method']`.
*
* # Examples
*
* ```php
* $toUpper = new Hoa\Consistency\Xcallable('strtoupper');
* assert('FOO' === $toUpper('foo'));
* ```
*
* # Exceptions
*
* A `Hoa\Consistency\Exception` exception is thrown if the callback form
* is invalid.
*
* ```php,must_throw(Hoa\Consistency\Exception)
* new Hoa\Consistency\Xcallable('Foo:');
* ```
*/
public function __construct($call, $able = '')
{
if ($call instanceof \Closure) {
$this->_callback = $call;
return;
}
if (!\is_string($able)) {
throw new Exception('Bad callback form; the able part must be a string.', 0);
}
if ('' === $able) {
if (\is_string($call)) {
if (false === \strpos($call, '::')) {
if (!\function_exists($call)) {
throw new Exception('Bad callback form; function %s does not exist.', 1, $call);
}
$this->_callback = $call;
return;
}
list($call, $able) = \explode('::', $call);
} elseif (\is_object($call)) {
if ($call instanceof StreamOut) {
$able = null;
} elseif (\method_exists($call, '__invoke')) {
$able = '__invoke';
} else {
throw new Exception('Bad callback form; an object but without a known '.'method.', 2);
}
} elseif (\is_array($call) && isset($call[0])) {
if (!isset($call[1])) {
$this->__construct($call[0]);
return;
}
$this->__construct($call[0], $call[1]);
return;
} else {
throw new Exception('Bad callback form.', 3);
}
}
$this->_callback = [$call, $able];
return;
}
/**
* Calls the callable.
*/
public function __invoke(...$arguments)
{
$callback = $this->getValidCallback($arguments);
return $callback(...$arguments);
}
/**
* Returns a valid PHP callback.
*/
public function getValidCallback(array &$arguments = [])
{
$callback = $this->_callback;
$head = null;
if (isset($arguments[0])) {
$head = &$arguments[0];
}
// If method is undetermined, we find it (we understand event bucket and
// stream).
if (null !== $head &&
\is_array($callback) &&
null === $callback[1]) {
if ($head instanceof EventBucket) {
$head = $head->getData();
}
switch ($type = \gettype($head)) {
case 'string':
if (1 === \strlen($head)) {
$method = 'writeCharacter';
} else {
$method = 'writeString';
}
break;
case 'boolean':
case 'integer':
case 'array':
$method = 'write'.\ucfirst($type);
break;
case 'double':
$method = 'writeFloat';
break;
default:
$method = 'writeAll';
$head = $head."\n";
}
$callback[1] = $method;
}
return $callback;
}
/**
* Computes the hash of this callable.
*
* Will produce:
* * `function#…`,
* * `class#…::…`,
* * `object(…)#…::…`,
* * `closure(…)`.
*/
public function getHash(): string
{
if (null !== $this->_hash) {
return $this->_hash;
}
$_ = &$this->_callback;
if (\is_string($_)) {
return $this->_hash = 'function#'.$_;
}
if (\is_array($_)) {
return
$this->_hash =
(\is_object($_[0])
? 'object('.\spl_object_hash($_[0]).')'.
'#'.\get_class($_[0])
: 'class#'.$_[0]).
'::'.
(null !== $_[1]
? $_[1]
: '???');
}
return $this->_hash = 'closure('.\spl_object_hash($_).')';
}
/**
* The string representation of a callable is its hash.
*/
public function __toString(): string
{
return $this->getHash();
}
/**
* Hoa's xcallable() helper.
*/
public static function from($call, $able = '')
{
if ($call instanceof self) {
return $call;
}
return new self($call, $able);
}
}
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