723 lines
22 KiB
PHP
723 lines
22 KiB
PHP
<?php
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/**
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* This file is part of CodeIgniter 4 framework.
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*
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* (c) CodeIgniter Foundation <admin@codeigniter.com>
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*
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* For the full copyright and license information, please view
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* the LICENSE file that was distributed with this source code.
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*/
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namespace CodeIgniter\View;
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use CodeIgniter\Autoloader\FileLocator;
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use CodeIgniter\View\Exceptions\ViewException;
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use Config\View as ViewConfig;
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use ParseError;
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use Psr\Log\LoggerInterface;
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/**
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* Class for parsing pseudo-vars
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*
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* @phpstan-type parser_callable (callable(mixed): mixed)
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* @phpstan-type parser_callable_string (callable(mixed): mixed)&string
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*
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* @see \CodeIgniter\View\ParserTest
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*/
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class Parser extends View
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{
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use ViewDecoratorTrait;
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/**
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* Left delimiter character for pseudo vars
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*
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* @var string
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*/
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public $leftDelimiter = '{';
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/**
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* Right delimiter character for pseudo vars
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*
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* @var string
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*/
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public $rightDelimiter = '}';
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/**
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* Left delimiter characters for conditionals
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*/
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protected string $leftConditionalDelimiter = '{';
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/**
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* Right delimiter characters for conditionals
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*/
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protected string $rightConditionalDelimiter = '}';
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/**
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* Stores extracted noparse blocks.
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*
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* @var array
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*/
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protected $noparseBlocks = [];
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/**
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* Stores any plugins registered at run-time.
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*
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* @var array<string, array<string>|callable|string>
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* @phpstan-var array<string, array<parser_callable_string>|parser_callable_string|parser_callable>
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*/
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protected $plugins = [];
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/**
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* Stores the context for each data element
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* when set by `setData` so the context is respected.
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*
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* @var array
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*/
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protected $dataContexts = [];
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/**
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* Constructor
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*
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* @param FileLocator|null $loader
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*/
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public function __construct(ViewConfig $config, ?string $viewPath = null, $loader = null, ?bool $debug = null, ?LoggerInterface $logger = null)
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{
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// Ensure user plugins override core plugins.
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$this->plugins = $config->plugins;
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parent::__construct($config, $viewPath, $loader, $debug, $logger);
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}
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/**
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* Parse a template
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*
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* Parses pseudo-variables contained in the specified template view,
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* replacing them with any data that has already been set.
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*/
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public function render(string $view, ?array $options = null, ?bool $saveData = null): string
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{
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$start = microtime(true);
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if ($saveData === null) {
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$saveData = $this->config->saveData;
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}
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$fileExt = pathinfo($view, PATHINFO_EXTENSION);
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$view = ($fileExt === '') ? $view . '.php' : $view; // allow Views as .html, .tpl, etc (from CI3)
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$cacheName = $options['cache_name'] ?? str_replace('.php', '', $view);
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// Was it cached?
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if (isset($options['cache']) && ($output = cache($cacheName))) {
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$this->logPerformance($start, microtime(true), $view);
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return $output;
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}
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$file = $this->viewPath . $view;
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if (! is_file($file)) {
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$fileOrig = $file;
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$file = $this->loader->locateFile($view, 'Views');
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// locateFile() will return false if the file cannot be found.
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if ($file === false) {
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throw ViewException::forInvalidFile($fileOrig);
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}
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}
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if ($this->tempData === null) {
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$this->tempData = $this->data;
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}
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$template = file_get_contents($file);
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$output = $this->parse($template, $this->tempData, $options);
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$this->logPerformance($start, microtime(true), $view);
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if ($saveData) {
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$this->data = $this->tempData;
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}
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$output = $this->decorateOutput($output);
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// Should we cache?
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if (isset($options['cache'])) {
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cache()->save($cacheName, $output, (int) $options['cache']);
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}
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$this->tempData = null;
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return $output;
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}
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/**
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* Parse a String
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*
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* Parses pseudo-variables contained in the specified string,
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* replacing them with any data that has already been set.
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*/
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public function renderString(string $template, ?array $options = null, ?bool $saveData = null): string
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{
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$start = microtime(true);
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if ($saveData === null) {
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$saveData = $this->config->saveData;
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}
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if ($this->tempData === null) {
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$this->tempData = $this->data;
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}
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$output = $this->parse($template, $this->tempData, $options);
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$this->logPerformance($start, microtime(true), $this->excerpt($template));
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if ($saveData) {
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$this->data = $this->tempData;
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}
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$this->tempData = null;
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return $output;
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}
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/**
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* Sets several pieces of view data at once.
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* In the Parser, we need to store the context here
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* so that the variable is correctly handled within the
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* parsing itself, and contexts (including raw) are respected.
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*
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* @param non-empty-string|null $context The context to escape it for: html, css, js, url, raw
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* If 'raw', no escaping will happen
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*/
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public function setData(array $data = [], ?string $context = null): RendererInterface
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{
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if ($context !== null && $context !== '') {
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foreach ($data as $key => &$value) {
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if (is_array($value)) {
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foreach ($value as &$obj) {
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$obj = $this->objectToArray($obj);
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}
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} else {
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$value = $this->objectToArray($value);
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}
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$this->dataContexts[$key] = $context;
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}
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}
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$this->tempData ??= $this->data;
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$this->tempData = array_merge($this->tempData, $data);
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return $this;
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}
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/**
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* Parse a template
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*
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* Parses pseudo-variables contained in the specified template,
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* replacing them with the data in the second param
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*
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* @param array $options Future options
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*/
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protected function parse(string $template, array $data = [], ?array $options = null): string
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{
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if ($template === '') {
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return '';
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}
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// Remove any possible PHP tags since we don't support it
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// and parseConditionals needs it clean anyway...
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$template = str_replace(['<?', '?>'], ['<?', '?>'], $template);
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$template = $this->parseComments($template);
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$template = $this->extractNoparse($template);
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// Replace any conditional code here so we don't have to parse as much
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$template = $this->parseConditionals($template);
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// Handle any plugins before normal data, so that
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// it can potentially modify any template between its tags.
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$template = $this->parsePlugins($template);
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// loop over the data variables, replacing
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// the content as we go.
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foreach ($data as $key => $val) {
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$escape = true;
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if (is_array($val)) {
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$escape = false;
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$replace = $this->parsePair($key, $val, $template);
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} else {
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$replace = $this->parseSingle($key, (string) $val);
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}
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foreach ($replace as $pattern => $content) {
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$template = $this->replaceSingle($pattern, $content, $template, $escape);
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}
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}
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return $this->insertNoparse($template);
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}
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/**
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* Parse a single key/value, extracting it
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*/
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protected function parseSingle(string $key, string $val): array
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{
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$pattern = '#' . $this->leftDelimiter . '!?\s*' . preg_quote($key, '#')
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. '(?(?=\s*\|\s*)(\s*\|*\s*([|\w<>=\(\),:.\-\s\+\\\\/]+)*\s*))(\s*)!?'
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. $this->rightDelimiter . '#ums';
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return [$pattern => $val];
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}
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/**
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* Parse a tag pair
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*
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* Parses tag pairs: {some_tag} string... {/some_tag}
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*/
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protected function parsePair(string $variable, array $data, string $template): array
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{
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// Holds the replacement patterns and contents
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// that will be used within a preg_replace in parse()
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$replace = [];
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// Find all matches of space-flexible versions of {tag}{/tag} so we
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// have something to loop over.
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preg_match_all(
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'#' . $this->leftDelimiter . '\s*' . preg_quote($variable, '#') . '\s*' . $this->rightDelimiter . '(.+?)' .
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$this->leftDelimiter . '\s*/' . preg_quote($variable, '#') . '\s*' . $this->rightDelimiter . '#us',
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$template,
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$matches,
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PREG_SET_ORDER
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);
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/*
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* Each match looks like:
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*
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* $match[0] {tag}...{/tag}
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* $match[1] Contents inside the tag
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*/
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foreach ($matches as $match) {
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// Loop over each piece of $data, replacing
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// its contents so that we know what to replace in parse()
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$str = ''; // holds the new contents for this tag pair.
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foreach ($data as $row) {
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// Objects that have a `toArray()` method should be
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// converted with that method (i.e. Entities)
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if (is_object($row) && method_exists($row, 'toArray')) {
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$row = $row->toArray();
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}
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// Otherwise, cast as an array and it will grab public properties.
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elseif (is_object($row)) {
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$row = (array) $row;
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}
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$temp = [];
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$pairs = [];
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$out = $match[1];
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foreach ($row as $key => $val) {
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// For nested data, send us back through this method...
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if (is_array($val)) {
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$pair = $this->parsePair($key, $val, $match[1]);
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if ($pair !== []) {
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$pairs[array_keys($pair)[0]] = true;
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$temp = array_merge($temp, $pair);
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}
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continue;
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}
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if (is_object($val)) {
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$val = 'Class: ' . get_class($val);
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} elseif (is_resource($val)) {
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$val = 'Resource';
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}
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$temp['#' . $this->leftDelimiter . '!?\s*' . preg_quote($key, '#') . '(?(?=\s*\|\s*)(\s*\|*\s*([|\w<>=\(\),:.\-\s\+\\\\/]+)*\s*))(\s*)!?' . $this->rightDelimiter . '#us'] = $val;
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}
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// Now replace our placeholders with the new content.
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foreach ($temp as $pattern => $content) {
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$out = $this->replaceSingle($pattern, $content, $out, ! isset($pairs[$pattern]));
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}
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$str .= $out;
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}
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$escapedMatch = preg_quote($match[0], '#');
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$replace['#' . $escapedMatch . '#us'] = $str;
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}
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return $replace;
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}
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/**
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* Removes any comments from the file. Comments are wrapped in {# #} symbols:
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*
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* {# This is a comment #}
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*/
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protected function parseComments(string $template): string
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{
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return preg_replace('/\{#.*?#\}/us', '', $template);
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}
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/**
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* Extracts noparse blocks, inserting a hash in its place so that
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* those blocks of the page are not touched by parsing.
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*/
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protected function extractNoparse(string $template): string
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{
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$pattern = '/\{\s*noparse\s*\}(.*?)\{\s*\/noparse\s*\}/ums';
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/*
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* $matches[][0] is the raw match
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* $matches[][1] is the contents
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*/
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if (preg_match_all($pattern, $template, $matches, PREG_SET_ORDER)) {
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foreach ($matches as $match) {
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// Create a hash of the contents to insert in its place.
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$hash = md5($match[1]);
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$this->noparseBlocks[$hash] = $match[1];
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$template = str_replace($match[0], "noparse_{$hash}", $template);
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}
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}
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return $template;
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}
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/**
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* Re-inserts the noparsed contents back into the template.
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*/
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public function insertNoparse(string $template): string
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{
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foreach ($this->noparseBlocks as $hash => $replace) {
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$template = str_replace("noparse_{$hash}", $replace, $template);
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unset($this->noparseBlocks[$hash]);
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}
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return $template;
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}
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/**
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* Parses any conditionals in the code, removing blocks that don't
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* pass so we don't try to parse it later.
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*
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* Valid conditionals:
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* - if
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* - elseif
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* - else
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*/
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protected function parseConditionals(string $template): string
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{
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$leftDelimiter = preg_quote($this->leftConditionalDelimiter, '/');
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$rightDelimiter = preg_quote($this->rightConditionalDelimiter, '/');
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$pattern = '/'
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. $leftDelimiter
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. '\s*(if|elseif)\s*((?:\()?(.*?)(?:\))?)\s*'
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. $rightDelimiter
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. '/ums';
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/*
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* For each match:
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* [0] = raw match `{if var}`
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* [1] = conditional `if`
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* [2] = condition `do === true`
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* [3] = same as [2]
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*/
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preg_match_all($pattern, $template, $matches, PREG_SET_ORDER);
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foreach ($matches as $match) {
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// Build the string to replace the `if` statement with.
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$condition = $match[2];
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$statement = $match[1] === 'elseif' ? '<?php elseif (' . $condition . '): ?>' : '<?php if (' . $condition . '): ?>';
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$template = str_replace($match[0], $statement, $template);
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}
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$template = preg_replace(
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'/' . $leftDelimiter . '\s*else\s*' . $rightDelimiter . '/ums',
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'<?php else: ?>',
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$template
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);
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$template = preg_replace(
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'/' . $leftDelimiter . '\s*endif\s*' . $rightDelimiter . '/ums',
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'<?php endif; ?>',
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$template
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);
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// Parse the PHP itself, or insert an error so they can debug
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ob_start();
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if ($this->tempData === null) {
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$this->tempData = $this->data;
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}
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extract($this->tempData);
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try {
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eval('?>' . $template . '<?php ');
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} catch (ParseError $e) {
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ob_end_clean();
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throw ViewException::forTagSyntaxError(str_replace(['?>', '<?php '], '', $template));
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}
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return ob_get_clean();
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}
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/**
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* Over-ride the substitution field delimiters.
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*
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* @param string $leftDelimiter
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* @param string $rightDelimiter
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*/
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public function setDelimiters($leftDelimiter = '{', $rightDelimiter = '}'): RendererInterface
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{
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$this->leftDelimiter = $leftDelimiter;
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$this->rightDelimiter = $rightDelimiter;
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return $this;
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}
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/**
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* Over-ride the substitution conditional delimiters.
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*
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* @param string $leftDelimiter
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* @param string $rightDelimiter
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*/
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public function setConditionalDelimiters($leftDelimiter = '{', $rightDelimiter = '}'): RendererInterface
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{
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$this->leftConditionalDelimiter = $leftDelimiter;
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$this->rightConditionalDelimiter = $rightDelimiter;
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return $this;
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}
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/**
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* Handles replacing a pseudo-variable with the actual content. Will double-check
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* for escaping brackets.
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*
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* @param array|string $pattern
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* @param string $content
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* @param string $template
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*/
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protected function replaceSingle($pattern, $content, $template, bool $escape = false): string
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{
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$content = (string) $content;
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// Replace the content in the template
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return preg_replace_callback($pattern, function ($matches) use ($content, $escape) {
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// Check for {! !} syntax to not escape this one.
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if (
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strpos($matches[0], $this->leftDelimiter . '!') === 0
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&& substr($matches[0], -1 - strlen($this->rightDelimiter)) === '!' . $this->rightDelimiter
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) {
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$escape = false;
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}
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return $this->prepareReplacement($matches, $content, $escape);
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}, (string) $template);
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}
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/**
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* Callback used during parse() to apply any filters to the value.
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*/
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protected function prepareReplacement(array $matches, string $replace, bool $escape = true): string
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{
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$orig = array_shift($matches);
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// Our regex earlier will leave all chained values on a single line
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// so we need to break them apart so we can apply them all.
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$filters = (isset($matches[1]) && $matches[1] !== '') ? explode('|', $matches[1]) : [];
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if ($escape && $filters === [] && ($context = $this->shouldAddEscaping($orig))) {
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$filters[] = "esc({$context})";
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}
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return $this->applyFilters($replace, $filters);
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}
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|
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/**
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* Checks the placeholder the view provided to see if we need to provide any autoescaping.
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*
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* @return false|string
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*/
|
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public function shouldAddEscaping(string $key)
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{
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$escape = false;
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|
|
$key = trim(str_replace(['{', '}'], '', $key));
|
|
|
|
// If the key has a context stored (from setData)
|
|
// we need to respect that.
|
|
if (array_key_exists($key, $this->dataContexts)) {
|
|
if ($this->dataContexts[$key] !== 'raw') {
|
|
return $this->dataContexts[$key];
|
|
}
|
|
}
|
|
// No pipes, then we know we need to escape
|
|
elseif (strpos($key, '|') === false) {
|
|
$escape = 'html';
|
|
}
|
|
// If there's a `noescape` then we're definitely false.
|
|
elseif (strpos($key, 'noescape') !== false) {
|
|
$escape = false;
|
|
}
|
|
// If no `esc` filter is found, then we'll need to add one.
|
|
elseif (! preg_match('/\s+esc/u', $key)) {
|
|
$escape = 'html';
|
|
}
|
|
|
|
return $escape;
|
|
}
|
|
|
|
/**
|
|
* Given a set of filters, will apply each of the filters in turn
|
|
* to $replace, and return the modified string.
|
|
*/
|
|
protected function applyFilters(string $replace, array $filters): string
|
|
{
|
|
// Determine the requested filters
|
|
foreach ($filters as $filter) {
|
|
// Grab any parameter we might need to send
|
|
preg_match('/\([\w<>=\/\\\,:.\-\s\+]+\)/u', $filter, $param);
|
|
|
|
// Remove the () and spaces to we have just the parameter left
|
|
$param = ($param !== []) ? trim($param[0], '() ') : null;
|
|
|
|
// Params can be separated by commas to allow multiple parameters for the filter
|
|
if ($param !== null && $param !== '') {
|
|
$param = explode(',', $param);
|
|
|
|
// Clean it up
|
|
foreach ($param as &$p) {
|
|
$p = trim($p, ' "');
|
|
}
|
|
} else {
|
|
$param = [];
|
|
}
|
|
|
|
// Get our filter name
|
|
$filter = $param !== [] ? trim(strtolower(substr($filter, 0, strpos($filter, '(')))) : trim($filter);
|
|
|
|
if (! array_key_exists($filter, $this->config->filters)) {
|
|
continue;
|
|
}
|
|
|
|
// Filter it....
|
|
$replace = $this->config->filters[$filter]($replace, ...$param);
|
|
}
|
|
|
|
return $replace;
|
|
}
|
|
|
|
// Plugins
|
|
|
|
/**
|
|
* Scans the template for any parser plugins, and attempts to execute them.
|
|
* Plugins are delimited by {+ ... +}
|
|
*
|
|
* @return string
|
|
*/
|
|
protected function parsePlugins(string $template)
|
|
{
|
|
foreach ($this->plugins as $plugin => $callable) {
|
|
// Paired tags are enclosed in an array in the config array.
|
|
$isPair = is_array($callable);
|
|
$callable = $isPair ? array_shift($callable) : $callable;
|
|
|
|
// See https://regex101.com/r/BCBBKB/1
|
|
$pattern = $isPair
|
|
? '#\{\+\s*' . $plugin . '([\w=\-_:\+\s\(\)/"@.]*)?\s*\+\}(.+?)\{\+\s*/' . $plugin . '\s*\+\}#uims'
|
|
: '#\{\+\s*' . $plugin . '([\w=\-_:\+\s\(\)/"@.]*)?\s*\+\}#uims';
|
|
|
|
/**
|
|
* Match tag pairs
|
|
*
|
|
* Each match is an array:
|
|
* $matches[0] = entire matched string
|
|
* $matches[1] = all parameters string in opening tag
|
|
* $matches[2] = content between the tags to send to the plugin.
|
|
*/
|
|
if (! preg_match_all($pattern, $template, $matches, PREG_SET_ORDER)) {
|
|
continue;
|
|
}
|
|
|
|
foreach ($matches as $match) {
|
|
$params = [];
|
|
|
|
preg_match_all('/([\w-]+=\"[^"]+\")|([\w-]+=[^\"\s=]+)|(\"[^"]+\")|(\S+)/u', trim($match[1]), $matchesParams);
|
|
|
|
foreach ($matchesParams[0] as $item) {
|
|
$keyVal = explode('=', $item);
|
|
|
|
if (count($keyVal) === 2) {
|
|
$params[$keyVal[0]] = str_replace('"', '', $keyVal[1]);
|
|
} else {
|
|
$params[] = str_replace('"', '', $item);
|
|
}
|
|
}
|
|
|
|
$template = $isPair
|
|
? str_replace($match[0], $callable($match[2], $params), $template)
|
|
: str_replace($match[0], $callable($params), $template);
|
|
}
|
|
}
|
|
|
|
return $template;
|
|
}
|
|
|
|
/**
|
|
* Makes a new plugin available during the parsing of the template.
|
|
*
|
|
* @return $this
|
|
*/
|
|
public function addPlugin(string $alias, callable $callback, bool $isPair = false)
|
|
{
|
|
$this->plugins[$alias] = $isPair ? [$callback] : $callback;
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Removes a plugin from the available plugins.
|
|
*
|
|
* @return $this
|
|
*/
|
|
public function removePlugin(string $alias)
|
|
{
|
|
unset($this->plugins[$alias]);
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Converts an object to an array, respecting any
|
|
* toArray() methods on an object.
|
|
*
|
|
* @param array|bool|float|int|object|string|null $value
|
|
*
|
|
* @return array|bool|float|int|string|null
|
|
*/
|
|
protected function objectToArray($value)
|
|
{
|
|
// Objects that have a `toArray()` method should be
|
|
// converted with that method (i.e. Entities)
|
|
if (is_object($value) && method_exists($value, 'toArray')) {
|
|
$value = $value->toArray();
|
|
}
|
|
// Otherwise, cast as an array and it will grab public properties.
|
|
elseif (is_object($value)) {
|
|
$value = (array) $value;
|
|
}
|
|
|
|
return $value;
|
|
}
|
|
}
|