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<?php |
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/** |
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* Platine Template |
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* |
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* Platine Template is a template engine that has taken a lot of inspiration from Django. |
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* |
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* This content is released under the MIT License (MIT) |
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* |
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* Copyright (c) 2020 Platine Template |
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* Copyright (c) 2014 Guz Alexander, http://guzalexander.com |
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* Copyright (c) 2011, 2012 Harald Hanek, http://www.delacap.com |
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* Copyright (c) 2006 Mateo Murphy |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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/** |
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* @file IfTag.php |
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* |
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* The "if" Template tag class |
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* |
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* @package Platine\Template\Tag |
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* @author Platine Developers Team |
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* @copyright Copyright (c) 2020 |
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* @license http://opensource.org/licenses/MIT MIT License |
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* @link http://www.iacademy.cf |
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* @version 1.0.0 |
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* @filesource |
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*/ |
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declare(strict_types=1); |
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namespace Platine\Template\Tag; |
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use Platine\Template\Exception\ParseException; |
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use Platine\Template\Parser\AbstractCondition; |
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use Platine\Template\Parser\Context; |
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use Platine\Template\Parser\Lexer; |
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use Platine\Template\Parser\Parser; |
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use Platine\Template\Parser\Token; |
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/** |
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* Class IfTag |
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* @package Platine\Template\Tag |
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*/ |
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class IfTag extends AbstractCondition |
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{ |
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/** |
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* holding the nodes to render for each logical block |
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* @var array<int, mixed> |
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*/ |
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protected array $nodeListHolders = []; |
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/** |
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* holding the block type, block markup (conditions) |
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* and block node list |
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* @var array<int, mixed> |
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*/ |
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protected array $blocks = []; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function __construct(string $markup, &$tokens, Parser $parser) |
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{ |
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//Initialize |
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$this->nodeListHolders[count($this->blocks)] = []; |
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$this->nodeList = & $this->nodeListHolders[count($this->blocks)]; |
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array_push($this->blocks, ['if', $markup, & $this->nodeList]); |
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parent::__construct($markup, $tokens, $parser); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function render(Context $context): string |
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{ |
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$context->push(); |
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$lexerLogical = new Lexer('/\s+(and|or)\s+/'); |
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$lexerConditional = new Lexer( |
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'/(' |
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. Token::QUOTED_FRAGMENT |
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. ')\s*([=!<>a-z_]+)?\s*(' |
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. Token::QUOTED_FRAGMENT |
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. ')?/' |
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); |
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$result = ''; |
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foreach ($this->blocks as $block) { |
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if ($block[0] === 'else') { |
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$result = $this->renderAll($block[2], $context); |
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break; |
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} |
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if ($block[0] === 'if' || $block[0] === 'elseif') { |
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// Extract logical operators |
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$lexerLogical->matchAll($block[1]); |
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$operators = $lexerLogical->getArrayMatch(1); |
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// Extract individual conditions |
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$individualConditions = $lexerLogical->split($block[1]); |
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$conditions = []; |
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foreach ($individualConditions as $condition) { |
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if ($lexerConditional->match($condition)) { |
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$left = $lexerConditional->isMatchNotNull(1) |
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? $lexerConditional->getStringMatch(1) |
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: null; |
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$operator = $lexerConditional->isMatchNotNull(2) |
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? $lexerConditional->getStringMatch(2) |
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: null; |
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$right = $lexerConditional->isMatchNotNull(3) |
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? $lexerConditional->getStringMatch(3) |
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: null; |
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array_push($conditions, [ |
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'left' => $left, |
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'operator' => $operator, |
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'right' => $right, |
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]); |
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} else { |
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throw new ParseException(sprintf( |
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'Syntax Error in "%s" - Valid syntax: if [conditions]', |
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'if' |
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)); |
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} |
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} |
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if (count($operators) > 0) { |
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// If statement contains and/or |
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$display = $this->evaluateCondition( |
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$conditions[0]['left'], |
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$conditions[0]['right'], |
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$conditions[0]['operator'], |
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$context |
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); |
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foreach ($operators as $key => $operator) { |
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if ($operator === 'and') { |
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$display = ( |
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$display |
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&& $this->evaluateCondition( |
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$conditions[$key + 1]['left'], |
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$conditions[$key + 1]['right'], |
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$conditions[$key + 1]['operator'], |
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$context |
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) |
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); |
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} else { |
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$display = ( |
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$display |
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|| $this->evaluateCondition( |
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$conditions[$key + 1]['left'], |
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$conditions[$key + 1]['right'], |
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$conditions[$key + 1]['operator'], |
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$context |
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) |
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); |
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} |
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} |
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} else { |
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// If statement is a single condition |
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$display = $this->evaluateCondition( |
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$conditions[0]['left'], |
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$conditions[0]['right'], |
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$conditions[0]['operator'], |
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$context |
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); |
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} |
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// hook for if not tag |
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$display = $this->negateCondition($display); |
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if ($display) { |
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$result = $this->renderAll($block[2], $context); |
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break; |
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} |
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} |
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} |
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$context->pop(); |
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return $result; |
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} |
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/** |
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* Handler negate condition |
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* @param mixed $value |
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* @return mixed |
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*/ |
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protected function negateCondition($value) |
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{ |
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// no need to negate a condition in a regular `if` |
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// tag (will do that in `ifnot` tag) |
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return $value; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function unknownTag(string $tag, string $param, array $tokens): void |
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{ |
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if ($tag === 'else' || $tag === 'elseif') { |
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// Update reference to node list holder for this block |
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$this->nodeListHolders[count($this->blocks) + 1] = []; |
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$this->nodeList = & $this->nodeListHolders[count($this->blocks) + 1]; |
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array_push($this->blocks, [$tag, $param, & $this->nodeList]); |
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} else { |
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parent::unknownTag($tag, $param, $tokens); |
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} |
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} |
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} |
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