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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\Extension\Core\DataTransformer; | |
13 | ||
14 | use Symfony\Component\Form\DataTransformerInterface; | |
15 | use Symfony\Component\Form\Exception\TransformationFailedException; | |
16 | use Symfony\Component\Form\Exception\UnexpectedTypeException; | |
17 | ||
18 | /** | |
19 | * Transforms between a normalized format (integer or float) and a percentage value. | |
20 | * | |
21 | * @author Bernhard Schussek <bschussek@gmail.com> | |
22 | * @author Florian Eckerstorfer <florian@eckerstorfer.org> | |
23 | */ | |
24 | class PercentToLocalizedStringTransformer implements DataTransformerInterface | |
25 | { | |
26 | const FRACTIONAL = 'fractional'; | |
27 | const INTEGER = 'integer'; | |
28 | ||
29 | protected static $types = array( | |
30 | self::FRACTIONAL, | |
31 | self::INTEGER, | |
32 | ); | |
33 | ||
34 | private $type; | |
35 | ||
36 | private $precision; | |
37 | ||
38 | /** | |
39 | * Constructor. | |
40 | * | |
41 | * @see self::$types for a list of supported types | |
42 | * | |
43 | * @param integer $precision The precision | |
44 | * @param string $type One of the supported types | |
45 | * | |
46 | * @throws UnexpectedTypeException if the given value of type is unknown | |
47 | */ | |
48 | public function __construct($precision = null, $type = null) | |
49 | { | |
50 | if (null === $precision) { | |
51 | $precision = 0; | |
52 | } | |
53 | ||
54 | if (null === $type) { | |
55 | $type = self::FRACTIONAL; | |
56 | } | |
57 | ||
58 | if (!in_array($type, self::$types, true)) { | |
59 | throw new UnexpectedTypeException($type, implode('", "', self::$types)); | |
60 | } | |
61 | ||
62 | $this->type = $type; | |
63 | $this->precision = $precision; | |
64 | } | |
65 | ||
66 | /** | |
67 | * Transforms between a normalized format (integer or float) into a percentage value. | |
68 | * | |
69 | * @param number $value Normalized value | |
70 | * | |
71 | * @return number Percentage value | |
72 | * | |
73 | * @throws TransformationFailedException If the given value is not numeric or | |
74 | * if the value could not be transformed. | |
75 | */ | |
76 | public function transform($value) | |
77 | { | |
78 | if (null === $value) { | |
79 | return ''; | |
80 | } | |
81 | ||
82 | if (!is_numeric($value)) { | |
83 | throw new TransformationFailedException('Expected a numeric.'); | |
84 | } | |
85 | ||
86 | if (self::FRACTIONAL == $this->type) { | |
87 | $value *= 100; | |
88 | } | |
89 | ||
90 | $formatter = $this->getNumberFormatter(); | |
91 | $value = $formatter->format($value); | |
92 | ||
93 | if (intl_is_failure($formatter->getErrorCode())) { | |
94 | throw new TransformationFailedException($formatter->getErrorMessage()); | |
95 | } | |
96 | ||
97 | // replace the UTF-8 non break spaces | |
98 | return $value; | |
99 | } | |
100 | ||
101 | /** | |
102 | * Transforms between a percentage value into a normalized format (integer or float). | |
103 | * | |
104 | * @param number $value Percentage value. | |
105 | * | |
106 | * @return number Normalized value. | |
107 | * | |
108 | * @throws TransformationFailedException If the given value is not a string or | |
109 | * if the value could not be transformed. | |
110 | */ | |
111 | public function reverseTransform($value) | |
112 | { | |
113 | if (!is_string($value)) { | |
114 | throw new TransformationFailedException('Expected a string.'); | |
115 | } | |
116 | ||
117 | if ('' === $value) { | |
118 | return null; | |
119 | } | |
120 | ||
121 | $formatter = $this->getNumberFormatter(); | |
122 | // replace normal spaces so that the formatter can read them | |
123 | $value = $formatter->parse(str_replace(' ', ' ', $value)); | |
124 | ||
125 | if (intl_is_failure($formatter->getErrorCode())) { | |
126 | throw new TransformationFailedException($formatter->getErrorMessage()); | |
127 | } | |
128 | ||
129 | if (self::FRACTIONAL == $this->type) { | |
130 | $value /= 100; | |
131 | } | |
132 | ||
133 | return $value; | |
134 | } | |
135 | ||
136 | /** | |
137 | * Returns a preconfigured \NumberFormatter instance | |
138 | * | |
139 | * @return \NumberFormatter | |
140 | */ | |
141 | protected function getNumberFormatter() | |
142 | { | |
143 | $formatter = new \NumberFormatter(\Locale::getDefault(), \NumberFormatter::DECIMAL); | |
144 | ||
145 | $formatter->setAttribute(\NumberFormatter::FRACTION_DIGITS, $this->precision); | |
146 | ||
147 | return $formatter; | |
148 | } | |
149 | } |