Engine::extractBlocks() - Code Metrics - Inspection of "Update CHANGELOG.md" - MarwanAlsoltany/velox - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 6923e5...88cee3 )

by Marwan

created 2021-12-12 13:47 UTC

Engine::extractBlocks() A

↳ Parent: Engine

Complexity

Conditions	2
Paths	2

Size

Total Lines	15
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	9
CRAP Score	2

Importance

Changes

Metric	Value
cc	2
eloc	8
c	0
b	0
f	0
nc	2
nop	1
dl	0
loc	15
ccs	9
cts	9
cp	1
crap	2
rs	10

<?php

/**
 * @author Marwan Al-Soltany <[email protected]>
 * @copyright Marwan Al-Soltany 2021
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

declare(strict_types=1);

namespace MAKS\Velox\Frontend\View;

use MAKS\Velox\Frontend\Path;
use MAKS\Velox\Helper\Misc;

/**
 * A class that serves as a templating engine for view files.
 * This templating engine is regular expression based.
 *
 * Templating tags:
 * - Create a block `{! @block name !}` ... `{! @endblock !}`, use `{! @super !}` to inherit parent block.
 * - Print a block `{! @block(name) !}`.
 * - Extend a file `{! @extends 'theme/layouts/file' !}`, blocks of this file will be inherited.
 * - Include a file `{! @include 'theme/includes/file' !}`, this will get rendered before inclusion.
 * - Embed a file `{! @embed 'theme/components/file' !}`, this will be included as is.
 * - Control structures `{! @if ($var) !}` ... `{! @endif !}`, `{! @foreach($vars as $var) !}` ... `{! @endforeach !}`.
 * - Variable assignments `{! $var = '' !}`, content can be a variable or any valid PHP expression.
 * - Print a variable `{{ $var }}`, content can be a variable or any PHP expression that can be casted to a string.
 * - Print a variable without escaping `{{{ $var }}}`, content can be a variable or any PHP expression that can be casted to a string.
 * - Comment something `{# This is a comment #}`, this will be a PHP comment (will not be available in final HTML).
 *
 * @internal
 * @since 1.3.0
 */
class Engine
{
    /**
     * Regular expressions for syntax tokens.
     */
    public const REGEX = [
        'dependency'             => '/{!\s*@(extends|embed)\s+[\'"]?(.*?)[\'"]?\s*!}/s',
        'include'                => '/{!\s*@include\s+[\'"]?(.*?)[\'"]?\s*!}/s',
        'block'                  => '/{!\s*@block\s+(.*?)\s*!}(.*?){!\s*@endblock\s*!}(?!.+{!\s*@endblock\s*!})/s',
        'block.child'            => '/{!\s*@block\s+.*?\s*!}.*({!\s*@block\s+(.*?)\s*!}(.*?){!\s*@endblock\s*!}).*{!\s*@endblock\s*!}/s',
        'block.print'            => '/{!\s*@block\((.*?)\)\s*!}/s',
        'block.super'            => '/{!\s*@super\s*!}/s',
        'php'                    => '/{!\s*(.+?)\s*!}/s',
        'comment'                => '/{#\s*(.+?)\s*#}/s',
        'controlStructure'       => '/@(if|else|elseif|endif|do|while|endwhile|for|endfor|foreach|endforeach|continue|switch|endswitch|break|return|require|include)/s',
        'controlStructure.start' => '/^@(if|else|elseif|while|for|foreach|switch)/s',
        'controlStructure.end'   => '/@(endif|endwhile|endfor|endforeach|endswitch)$/s',
        'print'                  => '/{{\s*(.+?)\s*}}/s',
        'print.unescaped'        => '/{{{\s*(.+?)\s*}}}/s',
    ];


    /**
     * Currently captured template blocks.
     */
    private array $blocks = [];

    /**
     * Template files directory.
     */
    protected string $templatesDirectory;

    /**
     * Template files file extension.
     */
    protected string $templatesFileExtension;

    /**
     * Template files cache directory.
     */
    protected string $cacheDirectory;

    /**
     * Whether or not to cache compiled template files.
     */
    protected bool $cache;


    /**
     * Whether or not to add debugging info to the compiled template.
     */
    public static bool $debug = false;


    /**
     * Class constructor.
     */
    public function __construct(
        string $templatesDirectory     = './templates',
        string $templatesFileExtension = '.phtml',
        string $cacheDirectory         = './cache/',
        bool $cache                    = true,
        bool $debug                    = false
    ) {
        $this->templatesDirectory     = $templatesDirectory;
        $this->templatesFileExtension = $templatesFileExtension;
        $this->cacheDirectory         = $cacheDirectory;
        $this->cache                  = $cache;

        $this->setDebug($debug);
    }


    /**
     * Renders a template file and pass the passed variables to it.
     *
     * @param string $file A relative path to template file from templates directory.
     * @param array $variables The variables to pass to the template.
     *
     * @return void
     */
    public function render(string $file, array $variables = []): void
    {
        $this->require(
            $this->getCompiledFile($file),
            $variables
        );
    }

    public function clearCache(): void
    {
        $files = glob(rtrim($this->cacheDirectory, '/') . '/*.php');

        array_map('unlink', $files);
    }

    /**
     * Compiles a template file and returns the path to the compiled template file from cache directory.
     *
     * @param string $file A relative path to template file from templates directory.
     *
     * @return string
     *
     * @throws \Exception If file does not exist.
     */
    public function getCompiledFile(string $file): string
    {
        $this->createCacheDirectory();

        $templateFile = $this->resolvePath($file);
        $cachedFile   = $this->resolveCachePath($file);

        $isCompiled = file_exists($cachedFile) && filemtime($cachedFile) > filemtime($templateFile);

        if (!$this->cache || !$isCompiled) {
            $content = vsprintf('<?php %s class_exists(\'%s\') or exit; ?> %s', [
                $this->cache ? '/* ' . $file . ' */' : 'unlink(__FILE__);',
                static::class,
                PHP_EOL . PHP_EOL . $this->getCompiledContent($file),
            ]);

            file_put_contents($cachedFile, $content);
        }

        return $cachedFile;
    }

    /**
     * Compiles a template file and returns the result after compilation.
     *
     * @param string $file A relative path to template file from templates directory.
     *
     * @return string
     *
     * @throws \Exception If file does not exist.
     */
    public function getCompiledContent(string $file): string
    {
        $file = $this->resolvePath($file);

        $this->assertFileExists($file);

        // execution order matters
        $code = $this->importDependencies($file);
        $code = $this->importIncludes($code);
        $code = $this->extractBlocks($code);
        $code = $this->injectBlocks($code);
        $code = $this->printUnescapedVariables($code);
        $code = $this->printVariables($code);
        $code = $this->wrapPhp($code);
        $code = $this->wrapComments($code);

        return $code;
    }

    /**
     * Evaluates a template file after compiling it in a temporary file and returns the result after evaluation.
     *
     * @param string $file A relative path to template file from templates directory.
     * @param array $variables The variables to pass to the template.
     *
     * @return string
     *
     * @throws \Exception If file does not exist.
     */
    public function getEvaluatedContent(string $file, array $variables = []): string
    {
        $this->createCacheDirectory();

        $content = $this->getCompiledContent($file);

        // an actual file is used here because 'require' does not work with 'php://temp'
        $file = tempnam($this->cacheDirectory, 'EVL');

        $temp = fopen($file, 'w');
        fwrite($temp, $content);
        fclose($temp);

        ob_start();
        $this->require($file, $variables);
        $content = ob_get_contents();
        ob_get_clean();

        unlink($file);

        return $content;
    }

    /**
     * Creates cache directory if it does not exist.
     *
     * @return void
     */
    private function createCacheDirectory(): void
    {
        if (!file_exists($this->cacheDirectory)) {
            mkdir($this->cacheDirectory, 0744, true);
        }
    }

    /**
     * Asserts that a file exists.
     *
     * @param string $file An absolute path to a file.
     *
     * @return void
     *
     * @throws \Exception If file does not exist.
     */
    private function assertFileExists(string $file): void
    {
        if (!file_exists($file)) {
            throw new \Exception(
                'Template file "' . $file . '" does not exist. ' .
                'The path is wrong. Hint: a parent directory may be missing'
            );
        }
    }

    /**
     * Requires a PHP file and pass it the passed variables.
     *
     * @param string $file An absolute path to the file that should be compiled.
     * @param array|null $variables [optional] An associative array of the variables to pass.
     *
     * @return void
     */
    protected static function require(string $file, ?array $variables = null): void
    {
        $_file = $file;
        unset($file);

        if ($variables !== null) {
            extract($variables, EXTR_OVERWRITE);
            unset($variables);
        }

        require($_file);
        unset($_file);
    }

    /**
     * Resolves a template file path.
     *
     * @param string $file The file path to resolve.
     *
     * @return string
     */
    protected function resolvePath(string $file): string
    {
        return Path::normalize(
            $this->templatesDirectory,
            $file,
            $this->templatesFileExtension
        );
    }

    /**
     * Resolves a template file path from cache directory.
     *
     * @param string $file The file path to resolve.
     *
     * @return string
     */
    protected function resolveCachePath(string $file): string
    {
        if (!$this->cache) {
            return Path::normalize($this->cacheDirectory, md5('temporary'), '.tmp');
        }

        $templatePath = strtr($file, [
            $this->templatesDirectory => '',
            $this->templatesFileExtension => '',
        ]);
        $templateName = Misc::transform($templatePath, 'snake');
        $cacheName    = $templateName . '_' . md5($file);

        return Path::normalize($this->cacheDirectory, $cacheName, '.php');
    }

    /**
     * Imports template dependencies.
     *
     * @param string $file The template file.
     *
     * @return string
     *
     * @throws \Exception If file does not exist.
     */
    final protected function importDependencies(string $file): string
    {
        $this->assertFileExists($file);

        $code = file_get_contents($file);

        $count = preg_match_all(
            static::REGEX['dependency'],
            $code,
            $matches,
            PREG_SET_ORDER
        ) ?: 0;

        for ($i = 0; $i < $count; $i++) {
            $match = $matches[$i][0];
            $type  = $matches[$i][1];
            $path  = $matches[$i][2];
            $path  = $this->resolvePath($path);

            $startComment = sprintf('<!-- %s::(\'%s\') [START] -->', $type, $path) . PHP_EOL;
            $endComment   = sprintf('<!-- %s::(\'%s\') [END] -->', $type, $path) . PHP_EOL;
            $content      = $this->importDependencies($path);
            $requirement  = vsprintf(
                '%s%s%s',
                $this->isDebug() ? [$startComment, $content, $endComment] : ['', $content, '']
            );

            $code = str_replace($match, $requirement, $code);
        }

        $code = preg_replace(static::REGEX['dependency'], '', $code);

        return $code;
    }

    /**
     * Imports template includes.
     *
     * @param string $code The template code.
     *
     * @return string
     */
    final protected function importIncludes(string $code): string
    {
        $count = preg_match_all(
            static::REGEX['include'],
            $code,
            $matches,
            PREG_SET_ORDER
        ) ?: 0;

        for ($i = 0; $i < $count; $i++) {
            $match = $matches[$i][0];
            $path  = $matches[$i][1];

            $startComment = sprintf('<!-- include::(\'%s\') [START] -->', $path) . PHP_EOL;
            $endComment   = sprintf('<!-- include::(\'%s\') [END] -->', $path) . PHP_EOL;
            $content      = $this->getEvaluatedContent($path);
            $requirement  = vsprintf(
                '%s%s%s',
                $this->isDebug() ? [$startComment, $content, $endComment] : ['', $content, '']
            );

            $code = str_replace($match, $requirement, $code);
        }

        $code = preg_replace(static::REGEX['include'], '', $code);

        return $code;
    }

    /**
     * Parses a template block, extract data from it, and updates class internal state.
     *
     * @param string $code The template block.
     *
     * @return string
     */
    final protected function parseBlock(string $code): string
    {
        preg_match(static::REGEX['block'], $code, $matches);
        $name  = $matches[1];
        $value = $matches[2];

        $comment = '';

        if (preg_match(static::REGEX['block.super'], $value)) {
            $value = preg_replace(
                static::REGEX['block.super'],
                sprintf('{! @block(%s) !}', $name . 'Super'),
                $value
            );
        }

        if (isset($this->blocks[$name])) {
            $this->blocks[$name . 'Super'] = $value;

            $comment = sprintf('<!-- block::(\'%s\') [INHERIT] -->', $name);
        } else {
            $this->blocks[$name] = $value;

            $comment = sprintf('<!-- block::(\'%s\') [ASSIGN] -->', $name);
        }


        return $this->isDebug() ? $comment : '';
    }

    /**
     * Extract blocks data from template code.
     *
     * @param string $code
     *
     * @return string
     */
    final protected function extractBlocks(string $code): string
    {
        $opening = '{! @block pseudo-' . md5($code) . ' !}';
        $closing = '{! @endblock !}';
        $code    = sprintf('%s%s%s', $opening, $code, $closing);

        while (preg_match(static::REGEX['block.child'], $code, $matches)) {
            $block = $matches[1];

            $code = str_replace($block, $this->parseBlock($block), $code);
        }

        $code = str_replace([$opening, $closing], ['', ''], $code);

        return $code;
    }

    /**
     * Injects blocks data in template code.
     *
     * @param string $code
     *
     * @return string
     */
    final protected function injectBlocks(string $code): string
    {
        while (preg_match(static::REGEX['block.print'], $code, $matches)) {
            $match = $matches[0];
            $block = $matches[1];

            $requirement = $this->blocks[$block] ?? '';

            if ($this->isDebug()) {
                $startComment     = sprintf('<!-- print::(\'%s\') [START] -->', $block) . PHP_EOL;
                $endComment       = sprintf('<!-- print::(\'%s\') [END] -->', $block) . PHP_EOL;
                $undefinedComment = sprintf('<!-- print::(\'$1\') [UNDEFINED] -->', $block);
                $requirement      = vsprintf(
                    '%s%s%s',
                    isset($this->blocks[$block]) ? [$startComment, $requirement, $endComment] : ['', $undefinedComment, '']
                );
            }

            $code = str_replace($match, $requirement, $code);
        }

        $this->blocks = [];

        return $code;
    }

    /**
     * Echos unescaped variables in template code.
     *
     * @param string $code
     *
     * @return string
     */
    final protected function printUnescapedVariables(string $code): string
    {
        $comment = $this->isDebug() ? '<!-- unescapedVariable::(\'$1\') [ECHO] -->' : '';

        return preg_replace(
            static::REGEX['print.unescaped'],
            $comment . '<?php echo (string)($1); ?>',
            $code
        );
    }

    /**
     * Echos escaped variables in template code.
     *
     * @param string $code
     *
     * @return string
     */
    final protected function printVariables(string $code): string
    {
        $comment = $this->isDebug() ? '<!-- escapedVariable::(\'$1\') [ECHO] -->' : '';

        return preg_replace(
            static::REGEX['print'],
            $comment . '<?php echo htmlentities((string)($1), ENT_QUOTES, \'UTF-8\'); ?>',
            $code
        );
    }

    /**
     * Wraps PHP in template code.
     *
     * @param string $code
     *
     * @return string
     */
    final protected function wrapPhp(string $code): string
    {
        $count = preg_match_all(
            static::REGEX['php'],
            $code,
            $matches,
            PREG_SET_ORDER
        ) ?: 0;

        for ($i = 0; $i < $count; $i++) {
            $match = trim($matches[$i][0]);
            $php   = trim($matches[$i][1]);

            $php = $this->wrapControlStructures($php);

            $comment     = sprintf('<!-- php::(\'%s\') [PHP] -->', $php) . PHP_EOL;
            $content     = sprintf('<?php %s ?>', $php);
            $requirement = vsprintf('%s%s', $this->isDebug() ? [$comment, $content] : ['', $content]);

            $code = str_replace($match, $requirement, $code);
        }

        return $code;
    }

    /**
     * Wraps control structures and PHP code in template code.
     *
     * @param string $code
     *
     * @return string
     */
    final protected function wrapControlStructures(string $code): string
    {
        if (preg_match(static::REGEX['controlStructure.start'], $code)) {
            // if code starts with an opening control structure
            // check if it ends with ':' and add ':' if it does not
            if (substr($code, 0, 1) !== ':') {
                $code = ltrim($code, '@ ') . ':';
            }
        } else {
            // if code ends with a closing control structure or anything else
            // check if it ends ';' and add ';' if it does not
            if (substr($code, -1) !== ';') {
                $code = ltrim($code, '@ ') . ';';
            }
        }

        return $code;
    }

    /**
     * Wraps comments in template code.
     *
     * @param string $code
     *
     * @return string
     */
    final protected function wrapComments(string $code): string
    {
        $comment = $this->isDebug() ? '<!-- comment::(\'$1\') [COMMENT] -->' : '';

        return preg_replace(
            static::REGEX['comment'],
            $comment . '<?php /* $1 */ ?>',
            $code
        );
    }

    /**
     * Get the value of `static::$debug`.
     *
     * @return bool
     */
    public function isDebug(): bool
    {
        return self::$debug;
    }

    /**
     * Set the value of `static::$debug`
     *
     * @return $this
     */
    public function setDebug(bool $debug)
    {
        self::$debug = $debug;

        return $this;
    }
}


1		<?php
2
3		/**
4		* @author Marwan Al-Soltany <[email protected]>
5		* @copyright Marwan Al-Soltany 2021
6		* For the full copyright and license information, please view
7		* the LICENSE file that was distributed with this source code.
8		*/
9
10		declare(strict_types=1);
11
12		namespace MAKS\Velox\Frontend\View;
13
14		use MAKS\Velox\Frontend\Path;
15		use MAKS\Velox\Helper\Misc;
16
17		/**
18		* A class that serves as a templating engine for view files.
19		* This templating engine is regular expression based.
20		*
21		* Templating tags:
22		* - Create a block `{! @block name !}` ... `{! @endblock !}`, use `{! @super !}` to inherit parent block.
23		* - Print a block `{! @block(name) !}`.
24		* - Extend a file `{! @extends 'theme/layouts/file' !}`, blocks of this file will be inherited.
25		* - Include a file `{! @include 'theme/includes/file' !}`, this will get rendered before inclusion.
26		* - Embed a file `{! @embed 'theme/components/file' !}`, this will be included as is.
27		* - Control structures `{! @if ($var) !}` ... `{! @endif !}`, `{! @foreach($vars as $var) !}` ... `{! @endforeach !}`.
28		* - Variable assignments `{! $var = '' !}`, content can be a variable or any valid PHP expression.
29		* - Print a variable `{{ $var }}`, content can be a variable or any PHP expression that can be casted to a string.
30		* - Print a variable without escaping `{{{ $var }}}`, content can be a variable or any PHP expression that can be casted to a string.
31		* - Comment something `{# This is a comment #}`, this will be a PHP comment (will not be available in final HTML).
32		*
33		* @internal
34		* @since 1.3.0
35		*/
36		class Engine
37		{
38		/**
39		* Regular expressions for syntax tokens.
40		*/
41		public const REGEX = [
42		'dependency' => '/{!\s@(extends\|embed)\s+[\'"]?(.?)[\'"]?\s*!}/s',
43		'include' => '/{!\s@include\s+[\'"]?(.?)[\'"]?\s*!}/s',
44		'block' => '/{!\s@block\s+(.?)\s!}(.?){!\s@endblock\s!}(?!.+{!\s@endblock\s!})/s',
45		'block.child' => '/{!\s@block\s+.?\s!}.({!\s@block\s+(.?)\s!}(.?){!\s@endblock\s!}).{!\s@endblock\s*!}/s',
46		'block.print' => '/{!\s@block\((.?)\)\s*!}/s',
47		'block.super' => '/{!\s@super\s!}/s',
48		'php' => '/{!\s(.+?)\s!}/s',
49		'comment' => '/{#\s(.+?)\s#}/s',
50		'controlStructure' => '/@(if\|else\|elseif\|endif\|do\|while\|endwhile\|for\|endfor\|foreach\|endforeach\|continue\|switch\|endswitch\|break\|return\|require\|include)/s',
51		'controlStructure.start' => '/^@(if\|else\|elseif\|while\|for\|foreach\|switch)/s',
52		'controlStructure.end' => '/@(endif\|endwhile\|endfor\|endforeach\|endswitch)$/s',
53		'print' => '/{{\s(.+?)\s}}/s',
54		'print.unescaped' => '/{{{\s(.+?)\s}}}/s',
55		];
56
57
58		/**
59		* Currently captured template blocks.
60		*/
61		private array $blocks = [];
62
63		/**
64		* Template files directory.
65		*/
66		protected string $templatesDirectory;
67
68		/**
69		* Template files file extension.
70		*/
71		protected string $templatesFileExtension;
72
73		/**
74		* Template files cache directory.
75		*/
76		protected string $cacheDirectory;
77
78		/**
79		* Whether or not to cache compiled template files.
80		*/
81		protected bool $cache;
82
83
84		/**
85		* Whether or not to add debugging info to the compiled template.
86		*/
87		public static bool $debug = false;
88
89
90		/**
91		* Class constructor.
92		*/
93	8	public function __construct(
94		string $templatesDirectory = './templates',
95		string $templatesFileExtension = '.phtml',
96		string $cacheDirectory = './cache/',
97		bool $cache = true,
98		bool $debug = false
99		) {
100	8	$this->templatesDirectory = $templatesDirectory;
101	8	$this->templatesFileExtension = $templatesFileExtension;
102	8	$this->cacheDirectory = $cacheDirectory;
103	8	$this->cache = $cache;
104
105	8	$this->setDebug($debug);
106	8	}
107
108
109		/**
110		* Renders a template file and pass the passed variables to it.
111		*
112		* @param string $file A relative path to template file from templates directory.
113		* @param array $variables The variables to pass to the template.
114		*
115		* @return void
116		*/
117	3	public function render(string $file, array $variables = []): void
118		{
119	3	$this->require(
120	3	$this->getCompiledFile($file),
121		$variables
122		);
123	3	}
124
125	1	public function clearCache(): void
126		{
127	1	$files = glob(rtrim($this->cacheDirectory, '/') . '/*.php');
128
129	1	array_map('unlink', $files);
130	1	}
131
132		/**
133		* Compiles a template file and returns the path to the compiled template file from cache directory.
134		*
135		* @param string $file A relative path to template file from templates directory.
136		*
137		* @return string
138		*
139		* @throws \Exception If file does not exist.
140		*/
141	14	public function getCompiledFile(string $file): string
142		{
143	14	$this->createCacheDirectory();
144
145	14	$templateFile = $this->resolvePath($file);
146	14	$cachedFile = $this->resolveCachePath($file);
147
148	14	$isCompiled = file_exists($cachedFile) && filemtime($cachedFile) > filemtime($templateFile);
149
150	14	if (!$this->cache \|\| !$isCompiled) {
151	11	$content = vsprintf('<?php %s class_exists(\'%s\') or exit; ?> %s', [
152	11	$this->cache ? '/* ' . $file . ' */' : 'unlink(__FILE__);',
153	11	static::class,
154	11	PHP_EOL . PHP_EOL . $this->getCompiledContent($file),
155		]);
156
157	11	file_put_contents($cachedFile, $content);
158		}
159
160	14	return $cachedFile;
161		}
162
163		/**
164		* Compiles a template file and returns the result after compilation.
165		*
166		* @param string $file A relative path to template file from templates directory.
167		*
168		* @return string
169		*
170		* @throws \Exception If file does not exist.
171		*/
172	13	public function getCompiledContent(string $file): string
173		{
174	13	$file = $this->resolvePath($file);
175
176	13	$this->assertFileExists($file);
177
178		// execution order matters
179	12	$code = $this->importDependencies($file);
180	12	$code = $this->importIncludes($code);
181	12	$code = $this->extractBlocks($code);
182	12	$code = $this->injectBlocks($code);
183	12	$code = $this->printUnescapedVariables($code);
184	12	$code = $this->printVariables($code);
185	12	$code = $this->wrapPhp($code);
186	12	$code = $this->wrapComments($code);
187
188	12	return $code;
189		}
190
191		/**
192		* Evaluates a template file after compiling it in a temporary file and returns the result after evaluation.
193		*
194		* @param string $file A relative path to template file from templates directory.
195		* @param array $variables The variables to pass to the template.
196		*
197		* @return string
198		*
199		* @throws \Exception If file does not exist.
200		*/
201	6	public function getEvaluatedContent(string $file, array $variables = []): string
202		{
203	6	$this->createCacheDirectory();
204
205	6	$content = $this->getCompiledContent($file);
206
207		// an actual file is used here because 'require' does not work with 'php://temp'
208	6	$file = tempnam($this->cacheDirectory, 'EVL');
209
210	6	$temp = fopen($file, 'w');
211	6	fwrite($temp, $content);
212	6	fclose($temp);
213
214	6	ob_start();
215	6	$this->require($file, $variables);
216	6	$content = ob_get_contents();
217	6	ob_get_clean();
218
219	6	unlink($file);
220
221	6	return $content;
222		}
223
224		/**
225		* Creates cache directory if it does not exist.
226		*
227		* @return void
228		*/
229	15	private function createCacheDirectory(): void
230		{
231	15	if (!file_exists($this->cacheDirectory)) {
232	7	mkdir($this->cacheDirectory, 0744, true);
233		}
234	15	}
235
236		/**
237		* Asserts that a file exists.
238		*
239		* @param string $file An absolute path to a file.
240		*
241		* @return void
242		*
243		* @throws \Exception If file does not exist.
244		*/
245	13	private function assertFileExists(string $file): void
246		{
247	13	if (!file_exists($file)) {
248	1	throw new \Exception(
249	1	'Template file "' . $file . '" does not exist. ' .
250	1	'The path is wrong. Hint: a parent directory may be missing'
251		);
252		}
253	12	}
254
255		/**
256		* Requires a PHP file and pass it the passed variables.
257		*
258		* @param string $file An absolute path to the file that should be compiled.
259		* @param array\|null $variables [optional] An associative array of the variables to pass.
260		*
261		* @return void
262		*/
263	6	protected static function require(string $file, ?array $variables = null): void
264		{
265	6	$_file = $file;
266	6	unset($file);
267
268	6	if ($variables !== null) {
269	6	extract($variables, EXTR_OVERWRITE);
270	6	unset($variables);
271		}
272
273	6	require($_file);
274	6	unset($_file);
275	6	}
276
277		/**
278		* Resolves a template file path.
279		*
280		* @param string $file The file path to resolve.
281		*
282		* @return string
283		*/
284	16	protected function resolvePath(string $file): string
285		{
286	16	return Path::normalize(
287	16	$this->templatesDirectory,
288	16	$file,
289	16	$this->templatesFileExtension
290		);
291		}
292
293		/**
294		* Resolves a template file path from cache directory.
295		*
296		* @param string $file The file path to resolve.
297		*
298		* @return string
299		*/
300	14	protected function resolveCachePath(string $file): string
301		{
302	14	if (!$this->cache) {
303	2	return Path::normalize($this->cacheDirectory, md5('temporary'), '.tmp');
304		}
305
306	12	$templatePath = strtr($file, [
307	12	$this->templatesDirectory => '',
308	12	$this->templatesFileExtension => '',
309		]);
310	12	$templateName = Misc::transform($templatePath, 'snake');
311	12	$cacheName = $templateName . '_' . md5($file);
312
313	12	return Path::normalize($this->cacheDirectory, $cacheName, '.php');
314		}
315
316		/**
317		* Imports template dependencies.
318		*
319		* @param string $file The template file.
320		*
321		* @return string
322		*
323		* @throws \Exception If file does not exist.
324		*/
325	12	final protected function importDependencies(string $file): string
326		{
327	12	$this->assertFileExists($file);
328
329	12	$code = file_get_contents($file);
330
331	12	$count = preg_match_all(
332	12	static::REGEX['dependency'],
333		$code,
334		$matches,
335	12	PREG_SET_ORDER
336	12	) ?: 0;
337
338	12	for ($i = 0; $i < $count; $i++) {
339	2	$match = $matches[$i][0];
340	2	$type = $matches[$i][1];
341	2	$path = $matches[$i][2];
342	2	$path = $this->resolvePath($path);
343
344	2	$startComment = sprintf('<!-- %s::(\'%s\') [START] -->', $type, $path) . PHP_EOL;
345	2	$endComment = sprintf('<!-- %s::(\'%s\') [END] -->', $type, $path) . PHP_EOL;
346	2	$content = $this->importDependencies($path);
347	2	$requirement = vsprintf(
348	2	'%s%s%s',
349	2	$this->isDebug() ? [$startComment, $content, $endComment] : ['', $content, '']
350		);
351
352	2	$code = str_replace($match, $requirement, $code);
353		}
354
355	12	$code = preg_replace(static::REGEX['dependency'], '', $code);
356
357	12	return $code;
358		}
359
360		/**
361		* Imports template includes.
362		*
363		* @param string $code The template code.
364		*
365		* @return string
366		*/
367	12	final protected function importIncludes(string $code): string
368		{
369	12	$count = preg_match_all(
370	12	static::REGEX['include'],
371		$code,
372		$matches,
373	12	PREG_SET_ORDER
374	12	) ?: 0;
375
376	12	for ($i = 0; $i < $count; $i++) {
377	6	$match = $matches[$i][0];
378	6	$path = $matches[$i][1];
379
380	6	$startComment = sprintf('<!-- include::(\'%s\') [START] -->', $path) . PHP_EOL;
381	6	$endComment = sprintf('<!-- include::(\'%s\') [END] -->', $path) . PHP_EOL;
382	6	$content = $this->getEvaluatedContent($path);
383	6	$requirement = vsprintf(
384	6	'%s%s%s',
385	6	$this->isDebug() ? [$startComment, $content, $endComment] : ['', $content, '']
386		);
387
388	6	$code = str_replace($match, $requirement, $code);
389		}
390
391	12	$code = preg_replace(static::REGEX['include'], '', $code);
392
393	12	return $code;
394		}
395
396		/**
397		* Parses a template block, extract data from it, and updates class internal state.
398		*
399		* @param string $code The template block.
400		*
401		* @return string
402		*/
403	6	final protected function parseBlock(string $code): string
404		{
405	6	preg_match(static::REGEX['block'], $code, $matches);
406	6	$name = $matches[1];
407	6	$value = $matches[2];
408
409	6	$comment = '';
410
411	6	if (preg_match(static::REGEX['block.super'], $value)) {
412	2	$value = preg_replace(
413	2	static::REGEX['block.super'],
414	2	sprintf('{! @block(%s) !}', $name . 'Super'),
415		$value
416		);
417		}
418
419	6	if (isset($this->blocks[$name])) {
420	2	$this->blocks[$name . 'Super'] = $value;
421
422	2	$comment = sprintf('<!-- block::(\'%s\') [INHERIT] -->', $name);
423		} else {
424	6	$this->blocks[$name] = $value;
425
426	6	$comment = sprintf('<!-- block::(\'%s\') [ASSIGN] -->', $name);
427		}
428
429
430	6	return $this->isDebug() ? $comment : '';
431		}
432
433		/**
434		* Extract blocks data from template code.
435		*
436		* @param string $code
437		*
438		* @return string
439		*/
440	12	final protected function extractBlocks(string $code): string
441		{
442	12	$opening = '{! @block pseudo-' . md5($code) . ' !}';
443	12	$closing = '{! @endblock !}';
444	12	$code = sprintf('%s%s%s', $opening, $code, $closing);
445
446	12	while (preg_match(static::REGEX['block.child'], $code, $matches)) {
447	6	$block = $matches[1];
448
449	6	$code = str_replace($block, $this->parseBlock($block), $code);
450		}
451
452	12	$code = str_replace([$opening, $closing], ['', ''], $code);
453
454	12	return $code;
455		}
456
457		/**
458		* Injects blocks data in template code.
459		*
460		* @param string $code
461		*
462		* @return string
463		*/
464	12	final protected function injectBlocks(string $code): string
465		{
466	12	while (preg_match(static::REGEX['block.print'], $code, $matches)) {
467	6	$match = $matches[0];
468	6	$block = $matches[1];
469
470	6	$requirement = $this->blocks[$block] ?? '';
471
472	6	if ($this->isDebug()) {
473	1	$startComment = sprintf('<!-- print::(\'%s\') [START] -->', $block) . PHP_EOL;
474	1	$endComment = sprintf('<!-- print::(\'%s\') [END] -->', $block) . PHP_EOL;
475	1	$undefinedComment = sprintf('<!-- print::(\'$1\') [UNDEFINED] -->', $block);
476	1	$requirement = vsprintf(
477	1	'%s%s%s',
478	1	isset($this->blocks[$block]) ? [$startComment, $requirement, $endComment] : ['', $undefinedComment, '']
479		);
480		}
481
482	6	$code = str_replace($match, $requirement, $code);
483		}
484
485	12	$this->blocks = [];
486
487	12	return $code;
488		}
489
490		/**
491		* Echos unescaped variables in template code.
492		*
493		* @param string $code
494		*
495		* @return string
496		*/
497	12	final protected function printUnescapedVariables(string $code): string
498		{
499	12	$comment = $this->isDebug() ? '<!-- unescapedVariable::(\'$1\') [ECHO] -->' : '';
500
501	12	return preg_replace(
502	12	static::REGEX['print.unescaped'],
503	12	$comment . '<?php echo (string)($1); ?>',
504		$code
505		);
506		}
507
508		/**
509		* Echos escaped variables in template code.
510		*
511		* @param string $code
512		*
513		* @return string
514		*/
515	12	final protected function printVariables(string $code): string
516		{
517	12	$comment = $this->isDebug() ? '<!-- escapedVariable::(\'$1\') [ECHO] -->' : '';
518
519	12	return preg_replace(
520	12	static::REGEX['print'],
521	12	$comment . '<?php echo htmlentities((string)($1), ENT_QUOTES, \'UTF-8\'); ?>',
522		$code
523		);
524		}
525
526		/**
527		* Wraps PHP in template code.
528		*
529		* @param string $code
530		*
531		* @return string
532		*/
533	12	final protected function wrapPhp(string $code): string
534		{
535	12	$count = preg_match_all(
536	12	static::REGEX['php'],
537		$code,
538		$matches,
539	12	PREG_SET_ORDER
540	12	) ?: 0;
541
542	12	for ($i = 0; $i < $count; $i++) {
543	2	$match = trim($matches[$i][0]);
544	2	$php = trim($matches[$i][1]);
545
546	2	$php = $this->wrapControlStructures($php);
547
548	2	$comment = sprintf('<!-- php::(\'%s\') [PHP] -->', $php) . PHP_EOL;
549	2	$content = sprintf('<?php %s ?>', $php);
550	2	$requirement = vsprintf('%s%s', $this->isDebug() ? [$comment, $content] : ['', $content]);
551
552	2	$code = str_replace($match, $requirement, $code);
553		}
554
555	12	return $code;
556		}
557
558		/**
559		* Wraps control structures and PHP code in template code.
560		*
561		* @param string $code
562		*
563		* @return string
564		*/
565	2	final protected function wrapControlStructures(string $code): string
566		{
567	2	if (preg_match(static::REGEX['controlStructure.start'], $code)) {
568		// if code starts with an opening control structure
569		// check if it ends with ':' and add ':' if it does not
570	2	if (substr($code, 0, 1) !== ':') {
571	2	$code = ltrim($code, '@ ') . ':';
572		}
573		} else {
574		// if code ends with a closing control structure or anything else
575		// check if it ends ';' and add ';' if it does not
576	2	if (substr($code, -1) !== ';') {
577	2	$code = ltrim($code, '@ ') . ';';
578		}
579		}
580
581	2	return $code;
582		}
583
584		/**
585		* Wraps comments in template code.
586		*
587		* @param string $code
588		*
589		* @return string
590		*/
591	12	final protected function wrapComments(string $code): string
592		{
593	12	$comment = $this->isDebug() ? '<!-- comment::(\'$1\') [COMMENT] -->' : '';
594
595	12	return preg_replace(
596	12	static::REGEX['comment'],
597	12	$comment . '<?php /* $1 */ ?>',
598		$code
599		);
600		}
601
602		/**
603		* Get the value of `static::$debug`.
604		*
605		* @return bool
606		*/
607	12	public function isDebug(): bool
608		{
609	12	return self::$debug;
610		}
611
612		/**
613		* Set the value of `static::$debug`
614		*
615		* @return $this
616		*/
617	8	public function setDebug(bool $debug)
618		{
619	8	self::$debug = $debug;
620
621	8	return $this;
622		}
623		}
624

MarwanAlsoltany / velox

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Engine::extractBlocks() A

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