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<?php
namespace Illuminate\View\Compilers\Concerns;
use Illuminate\Contracts\View\ViewCompilationException;
trait CompilesLoops
{
/**
* Counter to keep track of nested forelse statements.
*
* @var int
*/
protected $forElseCounter = 0;
/**
* Compile the for-else statements into valid PHP.
*
* @param string $expression
* @return string
*
* @throws \Illuminate\Contracts\View\ViewCompilationException
*/
protected function compileForelse($expression)
{
$empty = '$__empty_'.++$this->forElseCounter;
preg_match('/\( *(.+) +as +(.+)\)$/is', $expression ?? '', $matches);
if (count($matches) === 0) {
throw new ViewCompilationException('Malformed @forelse statement.');
}
$iteratee = trim($matches[1]);
$iteration = trim($matches[2]);
$initLoop = "\$__currentLoopData = {$iteratee}; \$__env->addLoop(\$__currentLoopData);";
$iterateLoop = '$__env->incrementLoopIndices(); $loop = $__env->getLastLoop();';
return "<?php {$empty} = true; {$initLoop} foreach(\$__currentLoopData as {$iteration}): {$iterateLoop} {$empty} = false; ?>";
}
/**
* Compile the for-else-empty and empty statements into valid PHP.
*
* @param string $expression
* @return string
*/
protected function compileEmpty($expression)
{
if ($expression) {
return "<?php if(empty{$expression}): ?>";
}
$empty = '$__empty_'.$this->forElseCounter--;
return "<?php endforeach; \$__env->popLoop(); \$loop = \$__env->getLastLoop(); if ({$empty}): ?>";
}
/**
* Compile the end-for-else statements into valid PHP.
*
* @return string
*/
protected function compileEndforelse()
{
return '<?php endif; ?>';
}
/**
* Compile the end-empty statements into valid PHP.
*
* @return string
*/
protected function compileEndEmpty()
{
return '<?php endif; ?>';
}
/**
* Compile the for statements into valid PHP.
*
* @param string $expression
* @return string
*/
protected function compileFor($expression)
{
return "<?php for{$expression}: ?>";
}
/**
* Compile the for-each statements into valid PHP.
*
* @param string $expression
* @return string
*
* @throws \Illuminate\Contracts\View\ViewCompilationException
*/
protected function compileForeach($expression)
{
preg_match('/\( *(.+) +as +(.*)\)$/is', $expression ?? '', $matches);
if (count($matches) === 0) {
throw new ViewCompilationException('Malformed @foreach statement.');
}
$iteratee = trim($matches[1]);
$iteration = trim($matches[2]);
$initLoop = "\$__currentLoopData = {$iteratee}; \$__env->addLoop(\$__currentLoopData);";
$iterateLoop = '$__env->incrementLoopIndices(); $loop = $__env->getLastLoop();';
return "<?php {$initLoop} foreach(\$__currentLoopData as {$iteration}): {$iterateLoop} ?>";
}
/**
* Compile the break statements into valid PHP.
*
* @param string $expression
* @return string
*/
protected function compileBreak($expression)
{
if ($expression) {
preg_match('/\(\s*(-?\d+)\s*\)$/', $expression, $matches);
return $matches ? '<?php break '.max(1, $matches[1]).'; ?>' : "<?php if{$expression} break; ?>";
}
return '<?php break; ?>';
}
/**
* Compile the continue statements into valid PHP.
*
* @param string $expression
* @return string
*/
protected function compileContinue($expression)
{
if ($expression) {
preg_match('/\(\s*(-?\d+)\s*\)$/', $expression, $matches);
return $matches ? '<?php continue '.max(1, $matches[1]).'; ?>' : "<?php if{$expression} continue; ?>";
}
return '<?php continue; ?>';
}
/**
* Compile the end-for statements into valid PHP.
*
* @return string
*/
protected function compileEndfor()
{
return '<?php endfor; ?>';
}
/**
* Compile the end-for-each statements into valid PHP.
*
* @return string
*/
protected function compileEndforeach()
{
return '<?php endforeach; $__env->popLoop(); $loop = $__env->getLastLoop(); ?>';
}
/**
* Compile the while statements into valid PHP.
*
* @param string $expression
* @return string
*/
protected function compileWhile($expression)
{
return "<?php while{$expression}: ?>";
}
/**
* Compile the end-while statements into valid PHP.
*
* @return string
*/
protected function compileEndwhile()
{
return '<?php endwhile; ?>';
}
}
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