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<?php
namespace Illuminate\View\Concerns;
use InvalidArgumentException;
trait ManagesStacks
{
/**
* All of the finished, captured push sections.
*
* @var array
*/
protected $pushes = [];
/**
* All of the finished, captured prepend sections.
*
* @var array
*/
protected $prepends = [];
/**
* The stack of in-progress push sections.
*
* @var array
*/
protected $pushStack = [];
/**
* Start injecting content into a push section.
*
* @param string $section
* @param string $content
* @return void
*/
public function startPush($section, $content = '')
{
if ($content === '') {
if (ob_start()) {
$this->pushStack[] = $section;
}
} else {
$this->extendPush($section, $content);
}
}
/**
* Stop injecting content into a push section.
*
* @return string
*
* @throws \InvalidArgumentException
*/
public function stopPush()
{
if (empty($this->pushStack)) {
throw new InvalidArgumentException('Cannot end a push stack without first starting one.');
}
return tap(array_pop($this->pushStack), function ($last) {
$this->extendPush($last, ob_get_clean());
});
}
/**
* Append content to a given push section.
*
* @param string $section
* @param string $content
* @return void
*/
protected function extendPush($section, $content)
{
if (! isset($this->pushes[$section])) {
$this->pushes[$section] = [];
}
if (! isset($this->pushes[$section][$this->renderCount])) {
$this->pushes[$section][$this->renderCount] = $content;
} else {
$this->pushes[$section][$this->renderCount] .= $content;
}
}
/**
* Start prepending content into a push section.
*
* @param string $section
* @param string $content
* @return void
*/
public function startPrepend($section, $content = '')
{
if ($content === '') {
if (ob_start()) {
$this->pushStack[] = $section;
}
} else {
$this->extendPrepend($section, $content);
}
}
/**
* Stop prepending content into a push section.
*
* @return string
*
* @throws \InvalidArgumentException
*/
public function stopPrepend()
{
if (empty($this->pushStack)) {
throw new InvalidArgumentException('Cannot end a prepend operation without first starting one.');
}
return tap(array_pop($this->pushStack), function ($last) {
$this->extendPrepend($last, ob_get_clean());
});
}
/**
* Prepend content to a given stack.
*
* @param string $section
* @param string $content
* @return void
*/
protected function extendPrepend($section, $content)
{
if (! isset($this->prepends[$section])) {
$this->prepends[$section] = [];
}
if (! isset($this->prepends[$section][$this->renderCount])) {
$this->prepends[$section][$this->renderCount] = $content;
} else {
$this->prepends[$section][$this->renderCount] = $content.$this->prepends[$section][$this->renderCount];
}
}
/**
* Get the string contents of a push section.
*
* @param string $section
* @param string $default
* @return string
*/
public function yieldPushContent($section, $default = '')
{
if (! isset($this->pushes[$section]) && ! isset($this->prepends[$section])) {
return $default;
}
$output = '';
if (isset($this->prepends[$section])) {
$output .= implode(array_reverse($this->prepends[$section]));
}
if (isset($this->pushes[$section])) {
$output .= implode($this->pushes[$section]);
}
return $output;
}
/**
* Flush all of the stacks.
*
* @return void
*/
public function flushStacks()
{
$this->pushes = [];
$this->prepends = [];
$this->pushStack = [];
}
}