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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
12namespace Symfony\Component\Form\Extension\Core\ChoiceList;
13
14/**
15 * A choice list for choices of type string or integer.
16 *
17 * Choices and their associated labels can be passed in a single array. Since
18 * choices are passed as array keys, only strings or integer choices are
19 * allowed. Choices may also be given as hierarchy of unlimited depth by
20 * creating nested arrays. The title of the sub-hierarchy can be stored in the
21 * array key pointing to the nested array.
22 *
23 * <code>
24 * $choiceList = new SimpleChoiceList(array(
25 * 'creditcard' => 'Credit card payment',
26 * 'cash' => 'Cash payment',
27 * ));
28 * </code>
29 *
30 * @author Bernhard Schussek <bschussek@gmail.com>
31 */
32class SimpleChoiceList extends ChoiceList
33{
34 /**
35 * Creates a new simple choice list.
36 *
37 * @param array $choices The array of choices with the choices as keys and
38 * the labels as values. Choices may also be given
39 * as hierarchy of unlimited depth by creating nested
40 * arrays. The title of the sub-hierarchy is stored
41 * in the array key pointing to the nested array.
42 * @param array $preferredChoices A flat array of choices that should be
43 * presented to the user with priority.
44 */
45 public function __construct(array $choices, array $preferredChoices = array())
46 {
47 // Flip preferred choices to speed up lookup
48 parent::__construct($choices, $choices, array_flip($preferredChoices));
49 }
50
51 /**
52 * {@inheritdoc}
53 */
54 public function getChoicesForValues(array $values)
55 {
56 $values = $this->fixValues($values);
57
58 // The values are identical to the choices, so we can just return them
59 // to improve performance a little bit
60 return $this->fixChoices(array_intersect($values, $this->getValues()));
61 }
62
63 /**
64 * {@inheritdoc}
65 */
66 public function getValuesForChoices(array $choices)
67 {
68 $choices = $this->fixChoices($choices);
69
70 // The choices are identical to the values, so we can just return them
71 // to improve performance a little bit
72 return $this->fixValues(array_intersect($choices, $this->getValues()));
73 }
74
75 /**
76 * Recursively adds the given choices to the list.
77 *
78 * Takes care of splitting the single $choices array passed in the
79 * constructor into choices and labels.
80 *
81 * @param array $bucketForPreferred The bucket where to store the preferred
82 * view objects.
83 * @param array $bucketForRemaining The bucket where to store the
84 * non-preferred view objects.
85 * @param array|\Traversable $choices The list of choices.
86 * @param array $labels Ignored.
87 * @param array $preferredChoices The preferred choices.
88 */
89 protected function addChoices(array &$bucketForPreferred, array &$bucketForRemaining, $choices, array $labels, array $preferredChoices)
90 {
91 // Add choices to the nested buckets
92 foreach ($choices as $choice => $label) {
93 if (is_array($label)) {
94 // Don't do the work if the array is empty
95 if (count($label) > 0) {
96 $this->addChoiceGroup(
97 $choice,
98 $bucketForPreferred,
99 $bucketForRemaining,
100 $label,
101 $label,
102 $preferredChoices
103 );
104 }
105 } else {
106 $this->addChoice(
107 $bucketForPreferred,
108 $bucketForRemaining,
109 $choice,
110 $label,
111 $preferredChoices
112 );
113 }
114 }
115 }
116
117 /**
118 * Returns whether the given choice should be preferred judging by the
119 * given array of preferred choices.
120 *
121 * Optimized for performance by treating the preferred choices as array
122 * where choices are stored in the keys.
123 *
124 * @param mixed $choice The choice to test.
125 * @param array $preferredChoices An array of preferred choices.
126 *
127 * @return Boolean Whether the choice is preferred.
128 */
129 protected function isPreferred($choice, array $preferredChoices)
130 {
131 // Optimize performance over the default implementation
132 return isset($preferredChoices[$choice]);
133 }
134
135 /**
136 * Converts the choice to a valid PHP array key.
137 *
138 * @param mixed $choice The choice.
139 *
140 * @return string|integer A valid PHP array key.
141 */
142 protected function fixChoice($choice)
143 {
144 return $this->fixIndex($choice);
145 }
146
147 /**
148 * {@inheritdoc}
149 */
150 protected function fixChoices(array $choices)
151 {
152 return $this->fixIndices($choices);
153 }
154
155 /**
156 * {@inheritdoc}
157 */
158 protected function createValue($choice)
159 {
160 // Choices are guaranteed to be unique and scalar, so we can simply
161 // convert them to strings
162 return (string) $choice;
163 }
164}
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