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