added Http::metadata (#13)

.docs/README.md

@@ -81,3 +81,10 @@ Collection of extra functions:
 
 - `isIco($s)` - trader identification number (Czech only)
 - `isRc($s)`- personal identification number (Czech and Slovak only)
+
+
+## `Http`
+
+Collection of extra functions: 
+
+- `metadata($s)` - gets http metadata from string, returns as `[name => content]`

src/Http.php

@@ -0,0 +1,51 @@
+<?php declare(strict_types = 1);
+
+namespace Contributte\Utils;
+
+use LogicException;
+use Nette\StaticClass;
+
+class Http
+{
+
+	use StaticClass;
+
+	/** @var string */
+	private static $metadataPattern = '
+		~<\s*meta\s
+
+		# using lookahead to capture type to $1
+		(?=[^>]*?
+			\b(?:name|property|http-equiv)\s*=\s*
+			(?|"\s*([^"]*?)\s*"|\'\s*([^\']*?)\s*\'|
+			([^"\'>]*?)(?=\s*/?\s*>|\s\w+\s*=))
+		)
+
+		# capture content to $2
+		[^>]*?\bcontent\s*=\s*
+			(?|"\s*([^"]*?)\s*"|\'\s*([^\']*?)\s*\'|
+			([^"\'>]*?)(?=\s*/?\s*>|\s\w+\s*=))
+		[^>]*>
+
+		~ix';
+
+	/**
+	 * Gets http metadata from string
+	 *
+	 * @return string[] [name => content]
+	 */
+	public static function metadata(string $content): array
+	{
+		if (preg_match_all(self::$metadataPattern, $content, $matches) !== false) {
+			$combine = array_combine($matches[1], $matches[2]);
+			if ($combine === false) {
+				throw new LogicException('Matches count is not equal.');
+			}
+
+			return $combine;
+		}
+
+		return [];
+	}
+
+}

tests/cases/Http.phpt

@@ -0,0 +1,33 @@
+<?php declare(strict_types = 1);
+
+/**
+ * Test: Http
+ */
+
+require_once __DIR__ . '/../bootstrap.php';
+
+use Contributte\Utils\Http;
+use Tester\Assert;
+
+// Http::metadata
+test(function (): void {
+	Assert::equal([
+		'bar' => 'foo',
+		'bar1' => 'foo',
+		'bar2 bar' => 'foo',
+		'bar3' => 'foo',
+		'bar4' => 'foo',
+		'bar5' => 'foo',
+		'bar6.bar' => 'foo',
+		'bar7.bar' => 'foo',
+	], Http::metadata('
+		<meta content = foo name = bar />
+		<meta content = foo name = bar1 >
+		<meta name=  bar2 bar content= foo >
+		<meta content="foo" name="bar3">
+		<meta name  ="bar4" content  =  " foo ">
+		<meta name=  "bar5" content="  foo  ">
+		<meta name="bar6.bar" content="foo ">
+		<meta  content=\' foo\' name = bar7.bar >
+	'));
+});