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1 | <?php |
2 | ||
3 | /* | |
4 | * This file is part of the Symfony package. | |
5 | * | |
6 | * (c) Fabien Potencier <fabien@symfony.com> | |
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 Symfony\Component\Form; | |
13 | ||
14 | use Symfony\Component\Form\Guess\Guess; | |
15 | use Symfony\Component\Form\Exception\UnexpectedTypeException; | |
16 | ||
17 | class FormTypeGuesserChain implements FormTypeGuesserInterface | |
18 | { | |
19 | private $guessers = array(); | |
20 | ||
21 | /** | |
22 | * Constructor. | |
23 | * | |
24 | * @param array $guessers Guessers as instances of FormTypeGuesserInterface | |
25 | * | |
26 | * @throws UnexpectedTypeException if any guesser does not implement FormTypeGuesserInterface | |
27 | */ | |
28 | public function __construct(array $guessers) | |
29 | { | |
30 | foreach ($guessers as $guesser) { | |
31 | if (!$guesser instanceof FormTypeGuesserInterface) { | |
32 | throw new UnexpectedTypeException($guesser, 'Symfony\Component\Form\FormTypeGuesserInterface'); | |
33 | } | |
34 | ||
35 | if ($guesser instanceof self) { | |
36 | $this->guessers = array_merge($this->guessers, $guesser->guessers); | |
37 | } else { | |
38 | $this->guessers[] = $guesser; | |
39 | } | |
40 | } | |
41 | } | |
42 | ||
43 | /** | |
44 | * {@inheritDoc} | |
45 | */ | |
46 | public function guessType($class, $property) | |
47 | { | |
48 | return $this->guess(function ($guesser) use ($class, $property) { | |
49 | return $guesser->guessType($class, $property); | |
50 | }); | |
51 | } | |
52 | ||
53 | /** | |
54 | * {@inheritDoc} | |
55 | */ | |
56 | public function guessRequired($class, $property) | |
57 | { | |
58 | return $this->guess(function ($guesser) use ($class, $property) { | |
59 | return $guesser->guessRequired($class, $property); | |
60 | }); | |
61 | } | |
62 | ||
63 | /** | |
64 | * {@inheritDoc} | |
65 | */ | |
66 | public function guessMaxLength($class, $property) | |
67 | { | |
68 | return $this->guess(function ($guesser) use ($class, $property) { | |
69 | return $guesser->guessMaxLength($class, $property); | |
70 | }); | |
71 | } | |
72 | ||
73 | /** | |
74 | * {@inheritDoc} | |
75 | */ | |
76 | public function guessPattern($class, $property) | |
77 | { | |
78 | return $this->guess(function ($guesser) use ($class, $property) { | |
79 | return $guesser->guessPattern($class, $property); | |
80 | }); | |
81 | } | |
82 | ||
83 | /** | |
84 | * Executes a closure for each guesser and returns the best guess from the | |
85 | * return values | |
86 | * | |
87 | * @param \Closure $closure The closure to execute. Accepts a guesser | |
88 | * as argument and should return a Guess instance | |
89 | * | |
90 | * @return Guess The guess with the highest confidence | |
91 | */ | |
92 | private function guess(\Closure $closure) | |
93 | { | |
94 | $guesses = array(); | |
95 | ||
96 | foreach ($this->guessers as $guesser) { | |
97 | if ($guess = $closure($guesser)) { | |
98 | $guesses[] = $guess; | |
99 | } | |
100 | } | |
101 | ||
102 | return Guess::getBestGuess($guesses); | |
103 | } | |
104 | } |