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<?php |
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/* @description Transformation Style Sheets - Revolutionising PHP templating * |
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* @author Tom Butler [email protected] * |
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* @copyright 2015 Tom Butler <[email protected]> | https://r.je/ * |
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License * |
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* @version 1.0 */ |
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namespace Transphporm\Property; |
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class Repeat implements \Transphporm\Property { |
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private $functionSet; |
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private $elementData; |
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private $line; |
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public function __construct(\Transphporm\FunctionSet $functionSet, \Transphporm\Hook\ElementData $elementData, &$line) { |
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$this->functionSet = $functionSet; |
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$this->elementData = $elementData; |
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$this->line = &$line; |
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} |
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public function run(array $values, \DomElement $element, array $rules, \Transphporm\Hook\PseudoMatcher $pseudoMatcher, array $properties = []) { |
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$values = $this->fixEmpty($values); |
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if ($element->getAttribute('transphporm') === 'added') return $element->parentNode->removeChild($element); |
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$max = $this->getMax($values); |
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$count = 0; |
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$repeat = $this->getRepeatValue($values, $max); |
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//Don't run repeat on the clones element or it will loop forever |
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unset($rules['repeat']); |
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$hook = $this->createHook($rules, $pseudoMatcher, $properties); |
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foreach ($repeat as $key => $iteration) { |
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if ($count+1 > $max) break; |
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$clone = $this->cloneElement($element, $iteration, $key, $count++); |
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//Re-run the hook on the new element, but use the iterated data |
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$hook->run($clone); |
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} |
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//Remove the original element |
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$element->parentNode->removeChild($element); |
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return false; |
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} |
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private function getRepeatValue($values, &$max) { |
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$mode = $this->getMode($values); |
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if ($mode === 'each') $repeat = $values[0]; |
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else if ($mode === 'loop') { |
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$repeat = range($values[0], $max); |
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$max++; |
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} |
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return $repeat; |
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} |
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private function getMode($args) { |
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return isset($args[2]) ? $args[2] : 'each'; |
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} |
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private function fixEmpty($value) { |
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if (empty($value[0])) $value[0] = []; |
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return $value; |
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} |
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private function cloneElement($element, $iteration, $key, $count) { |
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$clone = $element->cloneNode(true); |
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$this->tagElement($clone, $count); |
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$this->elementData->bind($clone, $iteration, 'iteration'); |
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$this->elementData->bind($clone, $key, 'key'); |
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$element->parentNode->insertBefore($clone, $element); |
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return $clone; |
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} |
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private function tagElement($element, $count) { |
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//Mark all but one of the nodes as having been added by transphporm, when the hook is run again, these are removed |
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if ($count > 0) $element->setAttribute('transphporm', 'added'); |
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} |
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private function getMax($values) { |
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return isset($values[1]) ? $values[1] : PHP_INT_MAX; |
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} |
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private function createHook($newRules, $pseudoMatcher, $properties) { |
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$var = ""; // PropertyHook requires that baseDir be passed by refrence |
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// and there is no reason to pass it so create $var to avoid errors |
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$hook = new \Transphporm\Hook\PropertyHook($newRules, $var, $this->line, "", $this->line, $pseudoMatcher, new \Transphporm\Parser\Value($this->functionSet), $this->functionSet); |
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foreach ($properties as $name => $property) $hook->registerProperty($name, $property); |
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return $hook; |
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} |
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} |
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Level-2 /
Transphporm
If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: