Pattern::parse() - Code Metrics - ICanBoogie/Routing - Measure and Improve Code Quality continuously with Scrutinizer

Pattern::parse() B
last analyzed 2016-05-07 09:55 UTC

↳ Parent: Pattern

Complexity

Conditions	3
Paths	4

Size

Total Lines	24
Code Lines	13

Duplication

Lines	0
Ratio	0 %

Importance

Changes	8
Bugs	0	Features	2

Metric	Value
cc	3
eloc	13
c	8
b	0
f	2
nc	4
nop	1
dl	0
loc	24
rs	8.9713

<?php

/*
 * This file is part of the ICanBoogie package.
 *
 * (c) Olivier Laviale <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace ICanBoogie\Routing;

use ICanBoogie\Accessor\AccessorTrait;

/**
 * Representation of a route pattern.
 *
 * <pre>
 * <?php
 *
 * use ICanBoogie\Routing\Pattern;
 *
 * $pattern = Pattern::from("/blog/<year:\d{4}>-<month:\d{2}>-:slug.html");
 * echo $pattern;       // "/blog/<year:\d{4}>-<month:\d{2}>-:slug.html"
 *
 * $pathname = $pattern->format([ 'year' => "2013", 'month' => "07", 'slug' => "test-is-a-test" ]);
 * echo $pathname;      // "/blog/2013-07-this-is-a-test.html"
 *
 * $matching = $pattern->match($pathname, $captured);
 *
 * var_dump($matching); // true
 * var_dump($captured); // [ 'year' => "2013", 'month' => "07", 'slug' => "test-is-a-test" ]
 * </pre>
 *
 * @property-read string $pattern The pattern.
 * @property-read array $interleaved The interleaved parts of the pattern.
 * @property-read array $params The names of the pattern params.
 * @property-read string $regex The regex of the pattern.
 */
class Pattern
{
	use AccessorTrait;

	static protected $extended_character_classes = [

		'{:uuid:}' => '[a-f0-9]{8}-[a-f0-9]{4}-4[a-f0-9]{3}-[89aAbB][a-f0-9]{3}-[a-f0-9]{12}',
		'{:sha1:}' => '[a-f0-9]{40}'

	];

	/**
	 * Parses a route pattern and returns an array of interleaved paths and parameters, the
	 * parameter names and the regular expression for the specified pattern.
	 *
	 * @param string $pattern A pattern.
	 *
	 * @return array
	 */
	static private function parse($pattern)
	{
		$catchall = false;

		if ($pattern{strlen($pattern) - 1} == '*')
		{
			$catchall = true;
			$pattern = substr($pattern, 0, -1);
		}

		$pattern = strtr($pattern, self::$extended_character_classes);
		$parts = preg_split('#(:\w+|<(\w+:)?([^>]+)>)#', $pattern, -1, PREG_SPLIT_DELIM_CAPTURE);
		list($interleaved, $params, $regex) = self::parse_parts($parts);

		if ($catchall)
		{
			$regex .= '(.*)';
			$params[] = 'all';
		}

		$regex .= '$#';

		return [ $interleaved, $params, $regex ];
	}

	/**
	 * Parses pattern parts.
	 *
	 * @param array $parts
	 *
	 * @return array
	 */
	static private function parse_parts(array $parts)
	{
		$regex = '#^';
		$interleaved = [];
		$params = [];
		$n = 0;

		for ($i = 0, $j = count($parts); $i < $j ;)
		{
			$part = $parts[$i++];

			$regex .= preg_quote($part, '#');
			$interleaved[] = $part;

			if ($i == $j)
			{
				break;
			}

			$part = $parts[$i++];

			if ($part{0} == ':')
			{
				$identifier = substr($part, 1);
				$separator = $parts[$i];
				$selector = $separator ? '[^/\\' . $separator{0} . ']+' : '[^/]+';
			}
			else
			{
				$identifier = substr($parts[$i++], 0, -1);

				if (!$identifier)
				{
					$identifier = $n++;
				}

				$selector = $parts[$i++];
			}

			$regex .= '(' . $selector . ')';
			$interleaved[] = [ $identifier, $selector ];
			$params[] = $identifier;
		}

		return [ $interleaved, $params, $regex ];
	}

	/**
	 * Reads an offset from an array.
	 *
	 * @param array $container
	 * @param string $key
	 *
	 * @return mixed
	 */
	static protected function read_value_from_array(array $container, $key)
	{
		return $container[$key];
	}

	/**
	 * Reads a property from an object.
	 *
	 * @param object $container
	 * @param string $key
	 *
	 * @return mixed
	 */
	static protected function read_value_from_object($container, $key)
	{
		return $container->$key;
	}

	/**
	 * Checks if the given string is a route pattern.
	 *
	 * @param string $pattern
	 *
	 * @return bool `true` if the given pattern is a route pattern, `false` otherwise.
	 */
	static public function is_pattern($pattern)
	{
		return (strpos($pattern, '<') !== false) || (strpos($pattern, ':') !== false) || (strpos($pattern, '*') !== false);
	}

	static private $instances;

	/**
	 * Creates a {@link Pattern} instance from the specified pattern.
	 *
	 * @param mixed $pattern
	 *
	 * @return Pattern
	 */
	static public function from($pattern)
	{
		if ($pattern instanceof static)
		{
			return $pattern;
		}

		if (isset(self::$instances[$pattern]))
		{
			return self::$instances[$pattern];
		}

		return self::$instances[$pattern] = new static($pattern);
	}

	/**
	 * Pattern.
	 *
	 * @var string
	 */
	private $pattern;

	protected function get_pattern()
	{
		return $this->pattern;
	}

	/**
	 * Interleaved pattern.
	 *
	 * @var array
	 */
	private $interleaved;

	protected function get_interleaved()
	{
		return $this->interleaved;
	}

	/**
	 * Params of the pattern.
	 *
	 * @var array
	 */
	private $params;

	protected function get_params()
	{
		return $this->params;
	}

	/**
	 * Regex of the pattern.
	 *
	 * @var string
	 */
	private $regex;

	protected function get_regex()
	{
		return $this->regex;
	}

	/**
	 * Initializes the {@link $pattern}, {@link $interleaved}, {@link $params} and {@link $regex}
	 * properties.
	 *
	 * @param string $pattern A route pattern.
	 */
	protected function __construct($pattern)
	{
		list($interleaved, $params, $regex) = self::parse($pattern);

		$this->pattern = $pattern;
		$this->interleaved = $interleaved;
		$this->params = $params;
		$this->regex = $regex;
	}

	/**
	 * Returns the route pattern specified during construct.
	 *
	 * @return string
	 */
	public function __toString()
	{
		return $this->pattern;
	}

	/**
	 * Formats a pattern with the specified values.
	 *
	 * @param array|object $values The values to format the pattern, either as an array or an
	 * object. If value is an instance of {@link ToSlug} the `to_slug()` method is used to
	 * transform the instance into a URL component.
	 *
	 * @return string
	 *
	 * @throws PatternRequiresValues in attempt to format a pattern requiring values without
	 * providing any.
	 */
	public function format($values = null)
	{
		if (!$this->params)
		{
			return $this->pattern;
		}

		if (!$values)
		{
			throw new PatternRequiresValues($this);
		}

		return $this->format_parts($values);
	}

	/**
	 * Formats pattern parts.
	 *
	 * @param array|object $container
	 *
	 * @return string
	 */
	private function format_parts($container)
	{
		$url = '';
		$method = 'read_value_from_' . (is_array($container) ? 'array' : 'object');

		foreach ($this->interleaved as $i => $value)
		{
			$url .= $i % 2 ? $this->format_part(self::$method($container, $value[0])) : $value;
		}

		return $url;
	}

	/**
	 * Formats pattern part.
	 *
	 * @param mixed $value
	 *
	 * @return string
	 */
	private function format_part($value)
	{
		if ($value instanceof ToSlug)
		{
			$value = $value->to_slug();
		}

		return urlencode($value);
	}

	/**
	 * Checks if a pathname matches the pattern.
	 *
	 * @param string $pathname The pathname.
	 * @param array $captured The parameters captured from the pathname.
	 *
	 * @return bool `true` if the pathname matches the pattern, `false` otherwise.
	 */
	public function match($pathname, &$captured = null)
	{
		$captured = [];

		#
		# `params` is empty if the pattern is a plain string,
		# thus we can simply compare strings.
		#

		if (!$this->params)
		{
			return $pathname === $this->pattern;
		}

		if (!preg_match($this->regex, $pathname, $matches))
		{
			return false;
		}

		array_shift($matches);

		$captured = array_combine($this->params, $matches);

		return true;
	}
}


1			<?php
2
3			/*
4			* This file is part of the ICanBoogie package.
5			*
6			* (c) Olivier Laviale <[email protected]>
7			*
8			* For the full copyright and license information, please view the LICENSE
9			* file that was distributed with this source code.
10			*/
11
12			namespace ICanBoogie\Routing;
13
14			use ICanBoogie\Accessor\AccessorTrait;
15
16			/**
17			* Representation of a route pattern.
18			*
19			* <pre>
20			* <?php
21			*
22			* use ICanBoogie\Routing\Pattern;
23			*
24			* $pattern = Pattern::from("/blog/<year:\d{4}>-<month:\d{2}>-:slug.html");
25			* echo $pattern; // "/blog/<year:\d{4}>-<month:\d{2}>-:slug.html"
26			*
27			* $pathname = $pattern->format([ 'year' => "2013", 'month' => "07", 'slug' => "test-is-a-test" ]);
28			* echo $pathname; // "/blog/2013-07-this-is-a-test.html"
29			*
30			* $matching = $pattern->match($pathname, $captured);
31			*
32			* var_dump($matching); // true
33			* var_dump($captured); // [ 'year' => "2013", 'month' => "07", 'slug' => "test-is-a-test" ]
34			* </pre>
35			*
36			* @property-read string $pattern The pattern.
37			* @property-read array $interleaved The interleaved parts of the pattern.
38			* @property-read array $params The names of the pattern params.
39			* @property-read string $regex The regex of the pattern.
40			*/
41			class Pattern
42			{
43			use AccessorTrait;
44
45			static protected $extended_character_classes = [
46
47			'{:uuid:}' => '[a-f0-9]{8}-[a-f0-9]{4}-4[a-f0-9]{3}-[89aAbB][a-f0-9]{3}-[a-f0-9]{12}',
48			'{:sha1:}' => '[a-f0-9]{40}'
49
50			];
51
52			/**
53			* Parses a route pattern and returns an array of interleaved paths and parameters, the
54			* parameter names and the regular expression for the specified pattern.
55			*
56			* @param string $pattern A pattern.
57			*
58			* @return array
59			*/
60			static private function parse($pattern)
61			{
62			$catchall = false;
63
64			if ($pattern{strlen($pattern) - 1} == '*')
65			{
66			$catchall = true;
67			$pattern = substr($pattern, 0, -1);
68			}
69
70			$pattern = strtr($pattern, self::$extended_character_classes);
71			$parts = preg_split('#(:\w+\|<(\w+:)?([^>]+)>)#', $pattern, -1, PREG_SPLIT_DELIM_CAPTURE);
72			list($interleaved, $params, $regex) = self::parse_parts($parts);
73
74			if ($catchall)
75			{
76			$regex .= '(.*)';
77			$params[] = 'all';
78			}
79
80			$regex .= '$#';
81
82			return [ $interleaved, $params, $regex ];
83			}
84
85			/**
86			* Parses pattern parts.
87			*
88			* @param array $parts
89			*
90			* @return array
91			*/
92			static private function parse_parts(array $parts)
93			{
94			$regex = '#^';
95			$interleaved = [];
96			$params = [];
97			$n = 0;
98
99			for ($i = 0, $j = count($parts); $i < $j ;)
100			{
101			$part = $parts[$i++];
102
103			$regex .= preg_quote($part, '#');
104			$interleaved[] = $part;
105
106			if ($i == $j)
107			{
108			break;
109			}
110
111			$part = $parts[$i++];
112
113			if ($part{0} == ':')
114			{
115			$identifier = substr($part, 1);
116			$separator = $parts[$i];
117			$selector = $separator ? '[^/\\' . $separator{0} . ']+' : '[^/]+';
118			}
119			else
120			{
121			$identifier = substr($parts[$i++], 0, -1);
122
123			if (!$identifier)
124			{
125			$identifier = $n++;
126			}
127
128			$selector = $parts[$i++];
129			}
130
131			$regex .= '(' . $selector . ')';
132			$interleaved[] = [ $identifier, $selector ];
133			$params[] = $identifier;
134			}
135
136			return [ $interleaved, $params, $regex ];
137			}
138
139			/**
140			* Reads an offset from an array.
141			*
142			* @param array $container
143			* @param string $key
144			*
145			* @return mixed
146			*/
147			static protected function read_value_from_array(array $container, $key)
148			{
149			return $container[$key];
150			}
151
152			/**
153			* Reads a property from an object.
154			*
155			* @param object $container
156			* @param string $key
157			*
158			* @return mixed
159			*/
160			static protected function read_value_from_object($container, $key)
161			{
162			return $container->$key;
163			}
164
165			/**
166			* Checks if the given string is a route pattern.
167			*
168			* @param string $pattern
169			*
170			* @return bool `true` if the given pattern is a route pattern, `false` otherwise.
171			*/
172			static public function is_pattern($pattern)
173			{
174			return (strpos($pattern, '<') !== false) \|\| (strpos($pattern, ':') !== false) \|\| (strpos($pattern, '*') !== false);
175			}
176
177			static private $instances;
178
179			/**
180			* Creates a {@link Pattern} instance from the specified pattern.
181			*
182			* @param mixed $pattern
183			*
184			* @return Pattern
185			*/
186			static public function from($pattern)
187			{
188			if ($pattern instanceof static)
189			{
190			return $pattern;
191			}
192
193			if (isset(self::$instances[$pattern]))
194			{
195			return self::$instances[$pattern];
196			}
197
198			return self::$instances[$pattern] = new static($pattern);
199			}
200
201			/**
202			* Pattern.
203			*
204			* @var string
205			*/
206			private $pattern;
207
208			protected function get_pattern()
209			{
210			return $this->pattern;
211			}
212
213			/**
214			* Interleaved pattern.
215			*
216			* @var array
217			*/
218			private $interleaved;
219
220			protected function get_interleaved()
221			{
222			return $this->interleaved;
223			}
224
225			/**
226			* Params of the pattern.
227			*
228			* @var array
229			*/
230			private $params;
231
232			protected function get_params()
233			{
234			return $this->params;
235			}
236
237			/**
238			* Regex of the pattern.
239			*
240			* @var string
241			*/
242			private $regex;
243
244			protected function get_regex()
245			{
246			return $this->regex;
247			}
248
249			/**
250			* Initializes the {@link $pattern}, {@link $interleaved}, {@link $params} and {@link $regex}
251			* properties.
252			*
253			* @param string $pattern A route pattern.
254			*/
255			protected function __construct($pattern)
256			{
257			list($interleaved, $params, $regex) = self::parse($pattern);
258
259			$this->pattern = $pattern;
260			$this->interleaved = $interleaved;
261			$this->params = $params;
262			$this->regex = $regex;
263			}
264
265			/**
266			* Returns the route pattern specified during construct.
267			*
268			* @return string
269			*/
270			public function __toString()
271			{
272			return $this->pattern;
273			}
274
275			/**
276			* Formats a pattern with the specified values.
277			*
278			* @param array\|object $values The values to format the pattern, either as an array or an
279			* object. If value is an instance of {@link ToSlug} the `to_slug()` method is used to
280			* transform the instance into a URL component.
281			*
282			* @return string
283			*
284			* @throws PatternRequiresValues in attempt to format a pattern requiring values without
285			* providing any.
286			*/
287			public function format($values = null)
288			{
289			if (!$this->params)
290			{
291			return $this->pattern;
292			}
293
294			if (!$values)
295			{
296			throw new PatternRequiresValues($this);
297			}
298
299			return $this->format_parts($values);
300			}
301
302			/**
303			* Formats pattern parts.
304			*
305			* @param array\|object $container
306			*
307			* @return string
308			*/
309			private function format_parts($container)
310			{
311			$url = '';
312			$method = 'read_value_from_' . (is_array($container) ? 'array' : 'object');
313
314			foreach ($this->interleaved as $i => $value)
315			{
316			$url .= $i % 2 ? $this->format_part(self::$method($container, $value[0])) : $value;
317			}
318
319			return $url;
320			}
321
322			/**
323			* Formats pattern part.
324			*
325			* @param mixed $value
326			*
327			* @return string
328			*/
329			private function format_part($value)
330			{
331			if ($value instanceof ToSlug)
332			{
333			$value = $value->to_slug();
334			}
335
336			return urlencode($value);
337			}
338
339			/**
340			* Checks if a pathname matches the pattern.
341			*
342			* @param string $pathname The pathname.
343			* @param array $captured The parameters captured from the pathname.
344			*
345			* @return bool `true` if the pathname matches the pattern, `false` otherwise.
346			*/
347			public function match($pathname, &$captured = null)
348			{
349			$captured = [];
350
351			#
352			# `params` is empty if the pattern is a plain string,
353			# thus we can simply compare strings.
354			#
355
356			if (!$this->params)
357			{
358			return $pathname === $this->pattern;
359			}
360
361			if (!preg_match($this->regex, $pathname, $matches))
362			{
363			return false;
364			}
365
366			array_shift($matches);
367
368			$captured = array_combine($this->params, $matches);
369
370			return true;
371			}
372			}
373

ICanBoogie / Routing

Pattern::parse() B last analyzed 2016-05-07 09:55 UTC

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Pattern::parse() B
last analyzed 2016-05-07 09:55 UTC