pohja/lib/Template.php

<?php
class Template {
	protected $template = null;
	protected $data = array();

	public function __construct(string $template, ?array $parentData = null) {
		$this->template = $template;

		if (isset($parentData)) {
			$this->data = $parentData;
		}
	}

	public function set(string $key, $value) {
		$this->data[$key] = $value;
	}

	public function render($options = null): string {
		Logger::log("Rendering template " . $this->template, Logger::IOREAD, "Template");

		$class = is_object($options) && isset($options->class) ? new $options->class($this, $options) : new EmptyTemplate($this, $options);
		$class->load();

		$contents = Cache::getTemplateFromCache($this->template);
		if (is_null($contents)) {
			$contents = file_get_contents(TEMPLATE_DIR . "/" . $this->template);
			Cache::setTemplateToCache($this->template, $contents);
		}

		$class->pretransform();
		// Replace includes of templates
		$matches = array();
		preg_match_all("/{{include (.*\.html)(.*)}}/", $contents, $matches);
		for ($i = 0; $i < count($matches[1]); $i++) {
			$matchString = $matches[0][$i];
			$match = $matches[1][$i];
			$options = trim($matches[2][$i]);

			$include = new Template(dirname($this->template) . "/" . $match, $this->data);
			$contents = str_replace($matchString, $include->render(
				!empty($options) ? json_decode($options, false, 512, JSON_THROW_ON_ERROR) : null
			), $contents);
		}

		$class->transform();

		// Replace variables
		foreach ($this->data as $key => $value) {
			if (is_string($value) || is_numeric($value)) {
				$contents = str_replace("{{" . $key . "}}", $value, $contents);
			} else {
				$contents = str_replace("{{" . $key . "}}", "", $contents);
			}
		}

		// Conditional tags are written as {{?<variablename>}}some content{{/<variablename>}}, find conditional tags and evaluate them if they exist in $this->data
		$matches = array();
		preg_match_all("/{{\?(.*)}}(.*){{\/(.*)}}/sU", $contents, $matches);
		for ($i = 0; $i < count($matches[1]); $i++) {
			$matchString = $matches[0][$i];
			$match = $matches[1][$i];
			$content = $matches[2][$i];

			if (isset($this->data[$match])) {
				$contents = str_replace($matchString, $content, $contents);
			} else {
				$contents = str_replace($matchString, "", $contents);
			}
		}

		$class->save();

		return $contents;
	}

	public function save(string $filename, string $contents, bool $minify = true) {
		Logger::log("Saving template to " . $filename, Logger::IOWRITE, "Template");

		if ($minify) {
			$size = strlen($contents);

			$doc = new DOMDocument();
			$doc->preserveWhiteSpace = false;
			$doc->formatOutput = false;
			$doc->normalizeDocument();

			libxml_use_internal_errors(true);

			$doc->loadHTML($contents);

			libxml_use_internal_errors(false);

			$options = [
				'keep_whitespace_around' => [
					// keep whitespace around inline elements
					'b', 'big', 'i', 'small', 'tt',
					'abbr', 'acronym', 'cite', 'code', 'dfn', 'em', 'kbd', 'strong', 'samp', 'var',
					'a', 'bdo', 'br', 'img', 'map', 'object', 'q', 'span', 'sub', 'sup',
					'button', 'input', 'label', 'select', 'textarea'
				],
				'keep_whitespace_in' => [/*'script', 'style',*/ 'pre'],
				'remove_empty_attributes' => ['style', 'class'],
				'indent_characters' => "\t"
			];

			//Comments,empty,whitespace
			$xpath = new \DOMXPath($doc);
			foreach ($xpath->query('//comment()') as $comment) {
				$comment->parentNode->removeChild($comment);
			}

			$xpath = new \DOMXPath($doc);
			foreach ($options['remove_empty_attributes'] as $attr) {
				foreach ($xpath->query('//*[@' . $attr . ']') as $el) {
					if (trim($el->getAttribute($attr)) == '') {
						$el->removeAttribute($attr);
					}
				}
			}

			$x = new \DOMXPath($doc);
			$nodeList = $x->query("//text()");
			foreach ($nodeList as $node) {
				/** @var \DOMNode $node */

				if (in_array($node->parentNode->nodeName, $options['keep_whitespace_in'])) {
					continue;
				};

				$node->nodeValue = str_replace(["\r", "\n", "\t"], ' ', $node->nodeValue);

				while (strpos($node->nodeValue, '  ') !== false) {
					$node->nodeValue = str_replace('  ', ' ', $node->nodeValue);
				}

				if (!in_array($node->parentNode->nodeName, $options['keep_whitespace_around'])) {
					if (!($node->previousSibling && in_array(
						$node->previousSibling->nodeName,
						$options['keep_whitespace_around']
					))) {
						$node->nodeValue = ltrim($node->nodeValue);
					}

					if (!($node->nextSibling && in_array(
						$node->nextSibling->nodeName,
						$options['keep_whitespace_around']
					))) {
						$node->nodeValue = rtrim($node->nodeValue);
					}
				}

				if ((strlen($node->nodeValue) == 0)) {
					$node->parentNode->removeChild($node);
				}
			}

			$contents = $doc->saveHTML();

			Logger::log("Minified template from " . $size . " to " . strlen($contents) . " bytes", Logger::METRICS, "Template");
		}

		file_put_contents(PUBLIC_DIR . "/" . $filename, $contents);
	}

	public function saveCss(string $filename, string $contents, bool $minify = true)
	{
		Logger::log("Saving css to " . $filename, Logger::IOWRITE, "Template");

		if ($minify) {
			$size = strlen($contents);

			$contents = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $contents);
			$contents = str_replace(': ', ':', $contents);
			$contents = str_replace(array("\r\n", "\r", "\n", "\t", '  ', '    ', '    '), '', $contents);

			Logger::log("Minified " . $filename . " from " . $size . " to " . strlen($contents) . " bytes", Logger::METRICS, "Template");
		}

		file_put_contents(PUBLIC_DIR . "/" . $filename, $contents);
	}

	public function saveScript(string $filename, string $contents, bool $minify = true)
	{
		Logger::log("Saving script to " . $filename, Logger::IOWRITE, "Template");

		if ($minify) {
			$size = strlen($contents);

			$contents = preg_replace('/([-\+])\s+\+([^\s;]*)/', '$1 (+$2)', $contents);
			$contents = preg_replace("/\s*\n\s*/", "\n", $contents);
			$contents = preg_replace("/\h+/", " ", $contents);
			$contents = preg_replace("/\h([^A-Za-z0-9\_\$])/", '$1', $contents);
			$contents = preg_replace("/([^A-Za-z0-9\_\$])\h/", '$1', $contents);
			$contents = preg_replace("/\s?([\(\[{])\s?/", '$1', $contents);
			$contents = preg_replace("/\s([\)\]}])/", '$1', $contents);
			$contents = preg_replace("/\s?([\.=:\-+,])\s?/", '$1', $contents);
			$contents = preg_replace("/;\n/", ";", $contents);
			$contents = preg_replace('/;}/', '}', $contents);
			$contents = preg_replace('/\s+/', ' ', $contents);
			$contents = preg_replace('/\s*([;{}])\s*/', '$1', $contents);

			$contents = preg_replace('/\s*(;{})\s*/', '$1', $contents);

			$contents = str_replace(array("\r\n", "\r", "\n", "\t", '  ', '    ', '    '), '', $contents);

			Logger::log("Minified " . $filename . " from " . $size . " to " . strlen($contents) . " bytes", Logger::METRICS, "Template");
		}

		file_put_contents(PUBLIC_DIR . "/" . $filename, $contents);
	}

}