BaseView::renderDynamic() - Code Metrics - Inspection of "Fix #94: Refactor default parameters feature to Ba..." - yiisoft/view - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( d2c063...2d8d97 )

by Alexander

created 2021-05-26 21:59 UTC

BaseView::renderDynamic() A

↳ Parent: BaseView

Complexity

Conditions	3
Paths	4

Size

Total Lines	17
Code Lines	10

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	0
CRAP Score	12

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
eloc	10
c	1
b	0
f	0
dl	0
loc	17
ccs	0
cts	10
cp	0
rs	9.9332
cc	3
nc	4
nop	2
crap	12

<?php

declare(strict_types=1);

namespace Yiisoft\View;

use InvalidArgumentException;
use Psr\EventDispatcher\EventDispatcherInterface;
use Psr\EventDispatcher\StoppableEventInterface;
use Psr\Log\LoggerInterface;
use RuntimeException;
use Throwable;
use Yiisoft\View\Event\AfterRenderEventInterface;
use Yiisoft\View\Exception\ViewNotFoundException;

use function count;
use function dirname;

/**
 * @internal Base class for {@see View} and {@see WebView}.
 */
abstract class BaseView implements DynamicContentAwareInterface
{
    protected EventDispatcherInterface $eventDispatcher;

    private LoggerInterface $logger;

    /**
     * @var string Base view path.
     */
    private string $basePath;

    /**
     * @var Theme|null The theme object.
     */
    private ?Theme $theme = null;

    /**
     * @var ViewContextInterface|null The context under which the {@see renderFile()} method is being invoked.
     */
    private ?ViewContextInterface $context = null;

    private string $placeholderSignature;

    /**
     * @var array A list of available renderers indexed by their corresponding supported file extensions. Each renderer
     * may be a view renderer object or the configuration for creating the renderer object. For example, the
     * following configuration enables the Twig view renderer:
     *
     * ```php
     * [
     *     'twig' => ['class' => \Yiisoft\Yii\Twig\ViewRenderer::class],
     * ]
     * ```
     *
     * If no renderer is available for the given view file, the view file will be treated as a normal PHP and rendered
     * via PhpTemplateRenderer.
     */
    private array $renderers = [];

    private string $language = 'en';
    private string $sourceLanguage = 'en';

    /**
     * @var string The default view file extension. This will be appended to view file names if they don't have file
     * extensions.
     */
    private string $defaultExtension = 'php';

    /**
     * @var array<string, mixed> Parameters that are common for all view templates.
     */
    private array $commonParameters = [];

    /**
     * @var array<string, string> Named content blocks that are common for all view templates.
     */
    private array $blocks = [];

    /**
     * @var array The view files currently being rendered. There may be multiple view files being
     * rendered at a moment because one view may be rendered within another.
     */
    private array $viewFiles = [];

    /**
     * @var DynamicContentAwareInterface[] A list of currently active dynamic content class instances.
     */
    private array $cacheStack = [];

    /**
     * @var array A list of placeholders for embedding dynamic contents.
     */
    private array $dynamicPlaceholders = [];

    public function __construct(string $basePath, EventDispatcherInterface $eventDispatcher, LoggerInterface $logger)
    {
        $this->basePath = $basePath;
        $this->eventDispatcher = $eventDispatcher;
        $this->logger = $logger;
        $this->setPlaceholderSalt(__DIR__);
    }

    /**
     * @return static
     */
    public function withTheme(Theme $theme): self
    {
        $new = clone $this;
        $new->theme = $theme;
        return $new;
    }

    public function withRenderers(array $renderers): self
    {
        $new = clone $this;
        $new->renderers = $renderers;
        return $new;
    }

    public function withLanguage(string $language): self
    {
        $new = clone $this;
        $new->language = $language;
        return $new;
    }

    public function withSourceLanguage(string $language): self
    {
        $new = clone $this;
        $new->sourceLanguage = $language;
        return $new;
    }

    public function withContext(ViewContextInterface $context): self
    {
        $new = clone $this;
        $new->context = $context;
        return $new;
    }

    public function getBasePath(): string
    {
        return $this->basePath;
    }

    final public function getPlaceholderSignature(): string
    {
        return $this->placeholderSignature;
    }

    final public function setPlaceholderSalt(string $salt): void
    {
        $this->placeholderSignature = dechex(crc32($salt));
    }

    public function getDefaultExtension(): string
    {
        return $this->defaultExtension;
    }

    public function withDefaultExtension(string $defaultExtension): self
    {
        $new = clone $this;
        $new->defaultExtension = $defaultExtension;
        return $new;
    }

    /**
     * Sets a common parameter that is accessible in all view templates.
     *
     * @param string $id The unique identifier of the parameter.
     * @param mixed $value The value of the parameter.
     */
    public function setCommonParameter(string $id, $value): void
    {
        $this->commonParameters[$id] = $value;
    }

    /**
     * Removes a common parameter.
     *
     * @param string $id The unique identifier of the parameter.
     */
    public function removeCommonParameter(string $id): void
    {
        unset($this->commonParameters[$id]);
    }

    /**
     * Gets a common parameter value by ID.
     *
     * @param string $id The unique identifier of the parameter.
     *
     * @return mixed The value of the parameter.
     */
    public function getCommonParameter(string $id)
    {
        if (isset($this->commonParameters[$id])) {
            return $this->commonParameters[$id];
        }

        throw new InvalidArgumentException('Common parameter: "' . $id . '" not found.');
    }

    /**
     * Checks the existence of a common parameter by ID.
     *
     * @param string $id The unique identifier of the parameter.
     *
     * @return bool Whether a custom parameter that is common for all view templates exists.
     */
    public function hasCommonParameter(string $id): bool
    {
        return isset($this->commonParameters[$id]);
    }

    /**
     * Sets a content block.
     *
     * @param string $id The unique identifier of the block.
     * @param mixed $content The content of the block.
     */
    public function setBlock(string $id, string $content): void
    {
        $this->blocks[$id] = $content;
    }

    /**
     * Removes a content block.
     *
     * @param string $id The unique identifier of the block.
     */
    public function removeBlock(string $id): void
    {
        unset($this->blocks[$id]);
    }

    /**
     * Gets content of the block by ID.
     *
     * @param string $id The unique identifier of the block.
     *
     * @return string The content of the block.
     */
    public function getBlock(string $id): string
    {
        if (isset($this->blocks[$id])) {
            return $this->blocks[$id];
        }

        throw new InvalidArgumentException('Block: "' . $id . '" not found.');
    }

    /**
     * Checks the existence of a content block by ID.
     *
     * @param string $id The unique identifier of the block.
     *
     * @return bool Whether a content block exists.
     */
    public function hasBlock(string $id): bool
    {
        return isset($this->blocks[$id]);
    }

    /**
     * @return string|null The view file currently being rendered. `null` if no view file is being rendered.
     */
    public function getViewFile(): ?string
    {
        return empty($this->viewFiles) ? null : end($this->viewFiles)['resolved'];
    }

    /**
     * Renders a view.
     *
     * The view to be rendered can be specified in one of the following formats:
     *
     * - [path alias](guide:concept-aliases) (e.g. "@app/views/site/index");
     * - absolute path within application (e.g. "//site/index"): the view name starts with double slashes. The actual
     *   view file will be looked for under the [[Application::viewPath|view path]] of the application.
     * - absolute path within current module (e.g. "/site/index"): the view name starts with a single slash. The actual
     *   view file will be looked for under the [[Module::viewPath|view path]]
     *   of the [[Controller::module|current module]].
     * - relative view (e.g. "index"): the view name does not start with `@` or `/`. The corresponding view file will be
     *   looked for under the {@see ViewContextInterface::getViewPath()} of the {@see View::$context}.
     *   If {@see View::$context} is not set, it will be looked for under the directory containing the view currently
     *   being rendered (i.e., this happens when rendering a view within another view).
     *
     * @param string $view the view name.
     * @param array $parameters the parameters (name-value pairs) that will be extracted and made available in the view
     * file.
     *
     * @throws RuntimeException If the view cannot be resolved.
     * @throws ViewNotFoundException If the view file does not exist.
     * @throws Throwable
     *
     * {@see renderFile()}
     *
     * @return string The rendering result.
     */
    public function render(string $view, array $parameters = []): string
    {
        $viewFile = $this->findTemplateFile($view);

        return $this->renderFile($viewFile, $parameters);
    }

    /**
     * Renders a view file.
     *
     * If {@see theme} is enabled (not null), it will try to render the themed version of the view file as long as it
     * is available.
     *
     * If {@see renderers} is enabled (not null), the method will use it to render the view file. Otherwise,
     * it will simply include the view file as a normal PHP file, capture its output and
     * return it as a string.
     *
     * @param string $viewFile The view file. This can be either an absolute file path or an alias of it.
     * @param array $parameters The parameters (name-value pairs) that will be extracted and made available in the view
     * file.
     *
     * @throws Throwable
     * @throws ViewNotFoundException If the view file does not exist
     *
     * @return string The rendering result.
     */
    public function renderFile(string $viewFile, array $parameters = []): string
    {
        $parameters = array_merge($this->commonParameters, $parameters);

        // TODO: these two match now
        $requestedFile = $viewFile;

        if ($this->theme !== null) {
            $viewFile = $this->theme->applyTo($viewFile);
        }

        if (is_file($viewFile)) {
            $viewFile = $this->localize($viewFile);
        } else {
            throw new ViewNotFoundException("The view file does not exist: $viewFile");
        }

        $output = '';
        $this->viewFiles[] = [
            'resolved' => $viewFile,
            'requested' => $requestedFile,
        ];

        if ($this->beforeRender($viewFile, $parameters)) {
            $this->logger->debug("Rendering view file: $viewFile");
            $ext = pathinfo($viewFile, PATHINFO_EXTENSION);
            $renderer = $this->renderers[$ext] ?? new PhpTemplateRenderer();
            $output = $renderer->render($this, $viewFile, $parameters);

            $output = $this->afterRender($viewFile, $parameters, $output);
        }

        array_pop($this->viewFiles);

        return $output;
    }

    /**
     * Returns the localized version of a specified file.
     *
     * The searching is based on the specified language code. In particular, a file with the same name will be looked
     * for under the subdirectory whose name is the same as the language code. For example, given the file
     * "path/to/view.php" and language code "zh-CN", the localized file will be looked for as path/to/zh-CN/view.php".
     * If the file is not found, it will try a fallback with just a language code that is "zh"
     * i.e. "path/to/zh/view.php".
     * If it is not found as well the original file will be returned.
     *
     * If the target and the source language codes are the same, the original file will be returned.
     *
     * @param string $file the original file
     * @param string|null $language the target language that the file should be localized to.
     * @param string|null $sourceLanguage the language that the original file is in.
     *
     * @return string the matching localized file, or the original file if the localized version is not found.
     * If the target and the source language codes are the same, the original file will be returned.
     */
    public function localize(string $file, ?string $language = null, ?string $sourceLanguage = null): string
    {
        $language = $language ?? $this->language;
        $sourceLanguage = $sourceLanguage ?? $this->sourceLanguage;

        if ($language === $sourceLanguage) {
            return $file;
        }
        $desiredFile = dirname($file) . DIRECTORY_SEPARATOR . $language . DIRECTORY_SEPARATOR . basename($file);
        if (is_file($desiredFile)) {
            return $desiredFile;
        }

        $language = substr($language, 0, 2);
        if ($language === $sourceLanguage) {
            return $file;
        }
        $desiredFile = dirname($file) . DIRECTORY_SEPARATOR . $language . DIRECTORY_SEPARATOR . basename($file);

        return is_file($desiredFile) ? $desiredFile : $file;
    }

    /**
     * Renders dynamic content returned by the given PHP statements.
     *
     * This method is mainly used together with content caching (fragment caching and page caching) when some portions
     * of the content (called *dynamic content*) should not be cached. The dynamic content must be returned by some PHP
     * statements. You can optionally pass additional parameters that will be available as variables in the PHP
     * statement:.
     *
     * ```php
     * <?= $this->renderDynamic('return foo($myVar);', [
     *     'myVar' => $model->getMyComplexVar(),
     * ]) ?>
     * ```
     *
     * @param string $statements the PHP statements for generating the dynamic content.
     * @param array $parameters the parameters (name-value pairs) that will be extracted and made
     * available in the $statement context. The parameters will be stored in the cache and be reused
     * each time $statement is executed. You should make sure, that these are safely serializable.
     *
     * @return string the placeholder of the dynamic content, or the dynamic content if there is no active content
     *                cache currently.
     */
    public function renderDynamic(string $statements, array $parameters = []): string
    {
        if (!empty($parameters)) {
            $statements = 'extract(unserialize(\'' .
                str_replace(['\\', '\''], ['\\\\', '\\\''], serialize($parameters)) .
                '\'));' . $statements;
        }

        if (!empty($this->cacheStack)) {
            $n = count($this->dynamicPlaceholders);
            $placeholder = "<![CDATA[YII-DYNAMIC-$n-{$this->getPlaceholderSignature()}]]>";
            $this->addDynamicPlaceholder($placeholder, $statements);

            return $placeholder;
        }

        return $this->evaluateDynamicContent($statements);
    }

    /**
     * Evaluates the given PHP statements.
     *
     * This method is mainly used internally to implement dynamic content feature.
     *
     * @param string $statements The PHP statements to be evaluated.
     *
     * @return mixed The return value of the PHP statements.
     */
    public function evaluateDynamicContent(string $statements)
    {
        return eval($statements);

    }

    /**
     * Returns a list of currently active dynamic content class instances.
     *
     * @return DynamicContentAwareInterface[] Class instances supporting dynamic contents.
     */
    public function getDynamicContents(): array
    {
        return $this->cacheStack;
    }

    /**
     * Adds a class instance supporting dynamic contents to the end of a list of currently active dynamic content class
     * instances.
     *
     * @param DynamicContentAwareInterface $instance Class instance supporting dynamic contents.
     */
    public function pushDynamicContent(DynamicContentAwareInterface $instance): void
    {
        $this->cacheStack[] = $instance;
    }

    /**
     * Removes a last class instance supporting dynamic contents from a list of currently active dynamic content class
     * instances.
     */
    public function popDynamicContent(): void
    {
        array_pop($this->cacheStack);
    }

    public function getDynamicPlaceholders(): array
    {
        return $this->dynamicPlaceholders;
    }

    public function setDynamicPlaceholders(array $placeholders): void
    {
        $this->dynamicPlaceholders = $placeholders;
    }

    public function addDynamicPlaceholder(string $name, string $statements): void
    {
        foreach ($this->cacheStack as $cache) {
            $cache->addDynamicPlaceholder($name, $statements);
        }

        $this->dynamicPlaceholders[$name] = $statements;
    }

    /**
     * This method is invoked right before {@see renderFile()} renders a view file.
     *
     * The default implementation will trigger the {@see BeforeRender()} event. If you override this method, make sure
     * you call the parent implementation first.
     *
     * @param string $viewFile the view file to be rendered.
     * @param array $parameters the parameter array passed to the {@see render()} method.
     *
     * @return bool whether to continue rendering the view file.
     */
    public function beforeRender(string $viewFile, array $parameters): bool
    {
        $event = $this->createBeforeRenderEvent($viewFile, $parameters);
        $event = $this->eventDispatcher->dispatch($event);

        return !$event->isPropagationStopped();
    }

    abstract protected function createBeforeRenderEvent(string $viewFile, array $parameters): StoppableEventInterface;

    /**
     * This method is invoked right after {@see renderFile()} renders a view file.
     *
     * The default implementation will trigger the {@see AfterRender} event. If you override this method, make sure you
     * call the parent implementation first.
     *
     * @param string $viewFile the view file being rendered.
     * @param array $parameters the parameter array passed to the {@see render()} method.
     * @param string $output the rendering result of the view file.
     *
     * @return string Updated output. It will be passed to {@see renderFile()} and returned.
     */
    public function afterRender(string $viewFile, array $parameters, string $output): string
    {
        $event = $this->createAfterRenderEvent($viewFile, $parameters, $output);

        /** @var AfterRenderEventInterface $event */
        $event = $this->eventDispatcher->dispatch($event);

        return $event->getResult();
    }

    abstract protected function createAfterRenderEvent(
        string $viewFile,
        array $parameters,
        string $result
    ): AfterRenderEventInterface;

    /**
     * Finds the view file based on the given view name.
     *
     * @param string $view The view name or the [path alias](guide:concept-aliases) of the view file. Please refer to
     * {@see render()} on how to specify this parameter.
     *
     * @throws RuntimeException If a relative view name is given while there is no active context to determine the
     * corresponding view file.
     *
     * @return string The view file path. Note that the file may not exist.
     */
    protected function findTemplateFile(string $view): string
    {
        if (strncmp($view, '//', 2) === 0) {
            // path relative to basePath e.g. "//layouts/main"
            $file = $this->basePath . '/' . ltrim($view, '/');
        } elseif (($currentViewFile = $this->getRequestedViewFile()) !== null) {
            // path relative to currently rendered view
            $file = dirname($currentViewFile) . '/' . $view;
        } elseif ($this->context instanceof ViewContextInterface) {
            // path provided by context
            $file = $this->context->getViewPath() . '/' . $view;
        } else {
            throw new RuntimeException("Unable to resolve view file for view '$view': no active view context.");
        }

        if (pathinfo($file, PATHINFO_EXTENSION) !== '') {
            return $file;
        }

        $path = $file . '.' . $this->defaultExtension;

        if ($this->defaultExtension !== 'php' && !is_file($path)) {
            $path = $file . '.php';
        }

        return $path;
    }

    /**
     * @return string|null The requested view currently being rendered. `null` if no view file is being rendered.
     */
    private function getRequestedViewFile(): ?string
    {
        return empty($this->viewFiles) ? null : end($this->viewFiles)['requested'];
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace Yiisoft\View;
6
7		use InvalidArgumentException;
8		use Psr\EventDispatcher\EventDispatcherInterface;
9		use Psr\EventDispatcher\StoppableEventInterface;
10		use Psr\Log\LoggerInterface;
11		use RuntimeException;
12		use Throwable;
13		use Yiisoft\View\Event\AfterRenderEventInterface;
14		use Yiisoft\View\Exception\ViewNotFoundException;
15
16		use function count;
17		use function dirname;
18
19		/**
20		* @internal Base class for {@see View} and {@see WebView}.
21		*/
22		abstract class BaseView implements DynamicContentAwareInterface
23		{
24		protected EventDispatcherInterface $eventDispatcher;
25
26		private LoggerInterface $logger;
27
28		/**
29		* @var string Base view path.
30		*/
31		private string $basePath;
32
33		/**
34		* @var Theme\|null The theme object.
35		*/
36		private ?Theme $theme = null;
37
38		/**
39		* @var ViewContextInterface\|null The context under which the {@see renderFile()} method is being invoked.
40		*/
41		private ?ViewContextInterface $context = null;
42
43		private string $placeholderSignature;
44
45		/**
46		* @var array A list of available renderers indexed by their corresponding supported file extensions. Each renderer
47		* may be a view renderer object or the configuration for creating the renderer object. For example, the
48		* following configuration enables the Twig view renderer:
49		*
50		* ```php
51		* [
52		* 'twig' => ['class' => \Yiisoft\Yii\Twig\ViewRenderer::class],
53		* ]
54		* ```
55		*
56		* If no renderer is available for the given view file, the view file will be treated as a normal PHP and rendered
57		* via PhpTemplateRenderer.
58		*/
59		private array $renderers = [];
60
61		private string $language = 'en';
62		private string $sourceLanguage = 'en';
63
64		/**
65		* @var string The default view file extension. This will be appended to view file names if they don't have file
66		* extensions.
67		*/
68		private string $defaultExtension = 'php';
69
70		/**
71		* @var array<string, mixed> Parameters that are common for all view templates.
72		*/
73		private array $commonParameters = [];
74
75		/**
76		* @var array<string, string> Named content blocks that are common for all view templates.
77		*/
78		private array $blocks = [];
79
80		/**
81		* @var array The view files currently being rendered. There may be multiple view files being
82		* rendered at a moment because one view may be rendered within another.
83		*/
84		private array $viewFiles = [];
85
86		/**
87		* @var DynamicContentAwareInterface[] A list of currently active dynamic content class instances.
88		*/
89		private array $cacheStack = [];
90
91		/**
92		* @var array A list of placeholders for embedding dynamic contents.
93		*/
94		private array $dynamicPlaceholders = [];
95
96	64	public function __construct(string $basePath, EventDispatcherInterface $eventDispatcher, LoggerInterface $logger)
97		{
98	64	$this->basePath = $basePath;
99	64	$this->eventDispatcher = $eventDispatcher;
100	64	$this->logger = $logger;
101	64	$this->setPlaceholderSalt(__DIR__);
102	64	}
103
104		/**
105		* @return static
106		*/
107	1	public function withTheme(Theme $theme): self
108		{
109	1	$new = clone $this;
110	1	$new->theme = $theme;
111	1	return $new;
112		}
113
114		public function withRenderers(array $renderers): self
115		{
116		$new = clone $this;
117		$new->renderers = $renderers;
118		return $new;
119		}
120
121		public function withLanguage(string $language): self
122		{
123		$new = clone $this;
124		$new->language = $language;
125		return $new;
126		}
127
128		public function withSourceLanguage(string $language): self
129		{
130		$new = clone $this;
131		$new->sourceLanguage = $language;
132		return $new;
133		}
134
135	1	public function withContext(ViewContextInterface $context): self
136		{
137	1	$new = clone $this;
138	1	$new->context = $context;
139	1	return $new;
140		}
141
142		public function getBasePath(): string
143		{
144		return $this->basePath;
145		}
146
147	35	final public function getPlaceholderSignature(): string
148		{
149	35	return $this->placeholderSignature;
150		}
151
152	64	final public function setPlaceholderSalt(string $salt): void
153		{
154	64	$this->placeholderSignature = dechex(crc32($salt));
155	64	}
156
157		public function getDefaultExtension(): string
158		{
159		return $this->defaultExtension;
160		}
161
162		public function withDefaultExtension(string $defaultExtension): self
163		{
164		$new = clone $this;
165		$new->defaultExtension = $defaultExtension;
166		return $new;
167		}
168
169		/**
170		* Sets a common parameter that is accessible in all view templates.
171		*
172		* @param string $id The unique identifier of the parameter.
173		* @param mixed $value The value of the parameter.
174		*/
175	3	public function setCommonParameter(string $id, $value): void
176		{
177	3	$this->commonParameters[$id] = $value;
178	3	}
179
180		/**
181		* Removes a common parameter.
182		*
183		* @param string $id The unique identifier of the parameter.
184		*/
185	1	public function removeCommonParameter(string $id): void
186		{
187	1	unset($this->commonParameters[$id]);
188	1	}
189
190		/**
191		* Gets a common parameter value by ID.
192		*
193		* @param string $id The unique identifier of the parameter.
194		*
195		* @return mixed The value of the parameter.
196		*/
197	1	public function getCommonParameter(string $id)
198		{
199	1	if (isset($this->commonParameters[$id])) {
200	1	return $this->commonParameters[$id];
201		}
202
203	1	throw new InvalidArgumentException('Common parameter: "' . $id . '" not found.');
204		}
205
206		/**
207		* Checks the existence of a common parameter by ID.
208		*
209		* @param string $id The unique identifier of the parameter.
210		*
211		* @return bool Whether a custom parameter that is common for all view templates exists.
212		*/
213	1	public function hasCommonParameter(string $id): bool
214		{
215	1	return isset($this->commonParameters[$id]);
216		}
217
218		/**
219		* Sets a content block.
220		*
221		* @param string $id The unique identifier of the block.
222		* @param mixed $content The content of the block.
223		*/
224	1	public function setBlock(string $id, string $content): void
225		{
226	1	$this->blocks[$id] = $content;
227	1	}
228
229		/**
230		* Removes a content block.
231		*
232		* @param string $id The unique identifier of the block.
233		*/
234	1	public function removeBlock(string $id): void
235		{
236	1	unset($this->blocks[$id]);
237	1	}
238
239		/**
240		* Gets content of the block by ID.
241		*
242		* @param string $id The unique identifier of the block.
243		*
244		* @return string The content of the block.
245		*/
246	1	public function getBlock(string $id): string
247		{
248	1	if (isset($this->blocks[$id])) {
249	1	return $this->blocks[$id];
250		}
251
252	1	throw new InvalidArgumentException('Block: "' . $id . '" not found.');
253		}
254
255		/**
256		* Checks the existence of a content block by ID.
257		*
258		* @param string $id The unique identifier of the block.
259		*
260		* @return bool Whether a content block exists.
261		*/
262	1	public function hasBlock(string $id): bool
263		{
264	1	return isset($this->blocks[$id]);
265		}
266
267		/**
268		* @return string\|null The view file currently being rendered. `null` if no view file is being rendered.
269		*/
270		public function getViewFile(): ?string
271		{
272		return empty($this->viewFiles) ? null : end($this->viewFiles)['resolved'];
273		}
274
275		/**
276		* Renders a view.
277		*
278		* The view to be rendered can be specified in one of the following formats:
279		*
280		* - [path alias](guide:concept-aliases) (e.g. "@app/views/site/index");
281		* - absolute path within application (e.g. "//site/index"): the view name starts with double slashes. The actual
282		* view file will be looked for under the [[Application::viewPath\|view path]] of the application.
283		* - absolute path within current module (e.g. "/site/index"): the view name starts with a single slash. The actual
284		* view file will be looked for under the [[Module::viewPath\|view path]]
285		* of the [[Controller::module\|current module]].
286		* - relative view (e.g. "index"): the view name does not start with `@` or `/`. The corresponding view file will be
287		* looked for under the {@see ViewContextInterface::getViewPath()} of the {@see View::$context}.
288		* If {@see View::$context} is not set, it will be looked for under the directory containing the view currently
289		* being rendered (i.e., this happens when rendering a view within another view).
290		*
291		* @param string $view the view name.
292		* @param array $parameters the parameters (name-value pairs) that will be extracted and made available in the view
293		* file.
294		*
295		* @throws RuntimeException If the view cannot be resolved.
296		* @throws ViewNotFoundException If the view file does not exist.
297		* @throws Throwable
298		*
299		* {@see renderFile()}
300		*
301		* @return string The rendering result.
302		*/
303	35	public function render(string $view, array $parameters = []): string
304		{
305	35	$viewFile = $this->findTemplateFile($view);
306
307	35	return $this->renderFile($viewFile, $parameters);
308		}
309
310		/**
311		* Renders a view file.
312		*
313		* If {@see theme} is enabled (not null), it will try to render the themed version of the view file as long as it
314		* is available.
315		*
316		* If {@see renderers} is enabled (not null), the method will use it to render the view file. Otherwise,
317		* it will simply include the view file as a normal PHP file, capture its output and
318		* return it as a string.
319		*
320		* @param string $viewFile The view file. This can be either an absolute file path or an alias of it.
321		* @param array $parameters The parameters (name-value pairs) that will be extracted and made available in the view
322		* file.
323		*
324		* @throws Throwable
325		* @throws ViewNotFoundException If the view file does not exist
326		*
327		* @return string The rendering result.
328		*/
329	38	public function renderFile(string $viewFile, array $parameters = []): string
330		{
331	38	$parameters = array_merge($this->commonParameters, $parameters);
332
333		// TODO: these two match now
334	38	$requestedFile = $viewFile;
335
336	38	if ($this->theme !== null) {
337	1	$viewFile = $this->theme->applyTo($viewFile);
338		}
339
340	38	if (is_file($viewFile)) {
341	38	$viewFile = $this->localize($viewFile);
342		} else {
343		throw new ViewNotFoundException("The view file does not exist: $viewFile");
344		}
345
346	38	$output = '';
347	38	$this->viewFiles[] = [
348	38	'resolved' => $viewFile,
349	38	'requested' => $requestedFile,
350		];
351
352	38	if ($this->beforeRender($viewFile, $parameters)) {
353	38	$this->logger->debug("Rendering view file: $viewFile");
354	38	$ext = pathinfo($viewFile, PATHINFO_EXTENSION);
355	38	$renderer = $this->renderers[$ext] ?? new PhpTemplateRenderer();
356	38	$output = $renderer->render($this, $viewFile, $parameters);
357
358	38	$output = $this->afterRender($viewFile, $parameters, $output);
359		}
360
361	38	array_pop($this->viewFiles);
362
363	38	return $output;
364		}
365
366		/**
367		* Returns the localized version of a specified file.
368		*
369		* The searching is based on the specified language code. In particular, a file with the same name will be looked
370		* for under the subdirectory whose name is the same as the language code. For example, given the file
371		* "path/to/view.php" and language code "zh-CN", the localized file will be looked for as path/to/zh-CN/view.php".
372		* If the file is not found, it will try a fallback with just a language code that is "zh"
373		* i.e. "path/to/zh/view.php".
374		* If it is not found as well the original file will be returned.
375		*
376		* If the target and the source language codes are the same, the original file will be returned.
377		*
378		* @param string $file the original file
379		* @param string\|null $language the target language that the file should be localized to.
380		* @param string\|null $sourceLanguage the language that the original file is in.
381		*
382		* @return string the matching localized file, or the original file if the localized version is not found.
383		* If the target and the source language codes are the same, the original file will be returned.
384		*/
385	39	public function localize(string $file, ?string $language = null, ?string $sourceLanguage = null): string
386		{
387	39	$language = $language ?? $this->language;
388	39	$sourceLanguage = $sourceLanguage ?? $this->sourceLanguage;
389
390	39	if ($language === $sourceLanguage) {
391	39	return $file;
392		}
393	1	$desiredFile = dirname($file) . DIRECTORY_SEPARATOR . $language . DIRECTORY_SEPARATOR . basename($file);
394	1	if (is_file($desiredFile)) {
395	1	return $desiredFile;
396		}
397
398		$language = substr($language, 0, 2);
399		if ($language === $sourceLanguage) {
400		return $file;
401		}
402		$desiredFile = dirname($file) . DIRECTORY_SEPARATOR . $language . DIRECTORY_SEPARATOR . basename($file);
403
404		return is_file($desiredFile) ? $desiredFile : $file;
405		}
406
407		/**
408		* Renders dynamic content returned by the given PHP statements.
409		*
410		* This method is mainly used together with content caching (fragment caching and page caching) when some portions
411		* of the content (called dynamic content) should not be cached. The dynamic content must be returned by some PHP
412		* statements. You can optionally pass additional parameters that will be available as variables in the PHP
413		* statement:.
414		*
415		* ```php
416		* <?= $this->renderDynamic('return foo($myVar);', [
417		* 'myVar' => $model->getMyComplexVar(),
418		* ]) ?>
419		* ```
420		*
421		* @param string $statements the PHP statements for generating the dynamic content.
422		* @param array $parameters the parameters (name-value pairs) that will be extracted and made
423		* available in the $statement context. The parameters will be stored in the cache and be reused
424		* each time $statement is executed. You should make sure, that these are safely serializable.
425		*
426		* @return string the placeholder of the dynamic content, or the dynamic content if there is no active content
427		* cache currently.
428		*/
429		public function renderDynamic(string $statements, array $parameters = []): string
430		{
431		if (!empty($parameters)) {
432		$statements = 'extract(unserialize(\'' .
433		str_replace(['\\', '\''], ['\\\\', '\\\''], serialize($parameters)) .
434		'\'));' . $statements;
435		}
436
437		if (!empty($this->cacheStack)) {
438		$n = count($this->dynamicPlaceholders);
439		$placeholder = "<![CDATA[YII-DYNAMIC-$n-{$this->getPlaceholderSignature()}]]>";
440		$this->addDynamicPlaceholder($placeholder, $statements);
441
442		return $placeholder;
443		}
444
445		return $this->evaluateDynamicContent($statements);
446		}
447
448		/**
449		* Evaluates the given PHP statements.
450		*
451		* This method is mainly used internally to implement dynamic content feature.
452		*
453		* @param string $statements The PHP statements to be evaluated.
454		*
455		* @return mixed The return value of the PHP statements.
456		*/
457		public function evaluateDynamicContent(string $statements)
458		{
459		return eval($statements);
		0 ignored issues – show introduced 2019-08-24 19:11 UTC by Report Bug Copy Issue Report The use of eval() is discouraged. Loading history...
460		}
461
462		/**
463		* Returns a list of currently active dynamic content class instances.
464		*
465		* @return DynamicContentAwareInterface[] Class instances supporting dynamic contents.
466		*/
467		public function getDynamicContents(): array
468		{
469		return $this->cacheStack;
470		}
471
472		/**
473		* Adds a class instance supporting dynamic contents to the end of a list of currently active dynamic content class
474		* instances.
475		*
476		* @param DynamicContentAwareInterface $instance Class instance supporting dynamic contents.
477		*/
478		public function pushDynamicContent(DynamicContentAwareInterface $instance): void
479		{
480		$this->cacheStack[] = $instance;
481		}
482
483		/**
484		* Removes a last class instance supporting dynamic contents from a list of currently active dynamic content class
485		* instances.
486		*/
487		public function popDynamicContent(): void
488		{
489		array_pop($this->cacheStack);
490		}
491
492		public function getDynamicPlaceholders(): array
493		{
494		return $this->dynamicPlaceholders;
495		}
496
497		public function setDynamicPlaceholders(array $placeholders): void
498		{
499		$this->dynamicPlaceholders = $placeholders;
500		}
501
502		public function addDynamicPlaceholder(string $name, string $statements): void
503		{
504		foreach ($this->cacheStack as $cache) {
505		$cache->addDynamicPlaceholder($name, $statements);
506		}
507
508		$this->dynamicPlaceholders[$name] = $statements;
509		}
510
511		/**
512		* This method is invoked right before {@see renderFile()} renders a view file.
513		*
514		* The default implementation will trigger the {@see BeforeRender()} event. If you override this method, make sure
515		* you call the parent implementation first.
516		*
517		* @param string $viewFile the view file to be rendered.
518		* @param array $parameters the parameter array passed to the {@see render()} method.
519		*
520		* @return bool whether to continue rendering the view file.
521		*/
522	38	public function beforeRender(string $viewFile, array $parameters): bool
523		{
524	38	$event = $this->createBeforeRenderEvent($viewFile, $parameters);
525	38	$event = $this->eventDispatcher->dispatch($event);
526
527	38	return !$event->isPropagationStopped();
528		}
529
530		abstract protected function createBeforeRenderEvent(string $viewFile, array $parameters): StoppableEventInterface;
531
532		/**
533		* This method is invoked right after {@see renderFile()} renders a view file.
534		*
535		* The default implementation will trigger the {@see AfterRender} event. If you override this method, make sure you
536		* call the parent implementation first.
537		*
538		* @param string $viewFile the view file being rendered.
539		* @param array $parameters the parameter array passed to the {@see render()} method.
540		* @param string $output the rendering result of the view file.
541		*
542		* @return string Updated output. It will be passed to {@see renderFile()} and returned.
543		*/
544	38	public function afterRender(string $viewFile, array $parameters, string $output): string
545		{
546	38	$event = $this->createAfterRenderEvent($viewFile, $parameters, $output);
547
548		/** @var AfterRenderEventInterface $event */
549	38	$event = $this->eventDispatcher->dispatch($event);
550
551	38	return $event->getResult();
552		}
553
554		abstract protected function createAfterRenderEvent(
555		string $viewFile,
556		array $parameters,
557		string $result
558		): AfterRenderEventInterface;
559
560		/**
561		* Finds the view file based on the given view name.
562		*
563		* @param string $view The view name or the [path alias](guide:concept-aliases) of the view file. Please refer to
564		* {@see render()} on how to specify this parameter.
565		*
566		* @throws RuntimeException If a relative view name is given while there is no active context to determine the
567		* corresponding view file.
568		*
569		* @return string The view file path. Note that the file may not exist.
570		*/
571	37	protected function findTemplateFile(string $view): string
572		{
573	37	if (strncmp($view, '//', 2) === 0) {
574		// path relative to basePath e.g. "//layouts/main"
575	36	$file = $this->basePath . '/' . ltrim($view, '/');
576	2	} elseif (($currentViewFile = $this->getRequestedViewFile()) !== null) {
577		// path relative to currently rendered view
578	2	$file = dirname($currentViewFile) . '/' . $view;
579	1	} elseif ($this->context instanceof ViewContextInterface) {
580		// path provided by context
581	1	$file = $this->context->getViewPath() . '/' . $view;
582		} else {
583		throw new RuntimeException("Unable to resolve view file for view '$view': no active view context.");
584		}
585
586	37	if (pathinfo($file, PATHINFO_EXTENSION) !== '') {
587	33	return $file;
588		}
589
590	4	$path = $file . '.' . $this->defaultExtension;
591
592	4	if ($this->defaultExtension !== 'php' && !is_file($path)) {
593		$path = $file . '.php';
594		}
595
596	4	return $path;
597		}
598
599		/**
600		* @return string\|null The requested view currently being rendered. `null` if no view file is being rendered.
601		*/
602	2	private function getRequestedViewFile(): ?string
603		{
604	2	return empty($this->viewFiles) ? null : end($this->viewFiles)['requested'];
605		}
606		}
607

yiisoft / view

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