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TwigFunction.php
001 <?php
002
003 /*
004 * This file is part of Twig.
005 *
006 * (c) Fabien Potencier
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Twig;
013
014 use Twig\Node\Expression\FunctionExpression;
015 use Twig\Node\Node;
016
017 /**
018 * Represents a template function.
019 *
020 * @final
021 *
022 * @author Fabien Potencier <fabien@symfony.com>
023 *
024 * @see https://twig.symfony.com/doc/templates.html#functions
025 */
026 class TwigFunction
027 {
028 private $name;
029 private $callable;
030 private $options;
031 private $arguments = [];
032
033 /**
034 * Creates a template function.
035 *
036 * @param string $name Name of this function
037 * @param callable|null $callable A callable implementing the function. If null, you need to overwrite the "node_class" option to customize compilation.
038 * @param array $options Options array
039 */
040 public function __construct(string $name, $callable = null, array $options = [])
041 {
042 if (__CLASS__ !== static::class) {
043 @trigger_error('Overriding '.__CLASS__.' is deprecated since Twig 2.4.0 and the class will be final in 3.0.', \E_USER_DEPRECATED);
044 }
045
046 $this->name = $name;
047 $this->callable = $callable;
048 $this->options = array_merge([
049 'needs_environment' => false,
050 'needs_context' => false,
051 'is_variadic' => false,
052 'is_safe' => null,
053 'is_safe_callback' => null,
054 'node_class' => FunctionExpression::class,
055 'deprecated' => false,
056 'alternative' => null,
057 ], $options);
058 }
059
060 public function getName()
061 {
062 return $this->name;
063 }
064
065 /**
066 * Returns the callable to execute for this function.
067 *
068 * @return callable|null
069 */
070 public function getCallable()
071 {
072 return $this->callable;
073 }
074
075 public function getNodeClass()
076 {
077 return $this->options['node_class'];
078 }
079
080 public function setArguments($arguments)
081 {
082 $this->arguments = $arguments;
083 }
084
085 public function getArguments()
086 {
087 return $this->arguments;
088 }
089
090 public function needsEnvironment()
091 {
092 return $this->options['needs_environment'];
093 }
094
095 public function needsContext()
096 {
097 return $this->options['needs_context'];
098 }
099
100 public function getSafe(Node $functionArgs)
101 {
102 if (null !== $this->options['is_safe']) {
103 return $this->options['is_safe'];
104 }
105
106 if (null !== $this->options['is_safe_callback']) {
107 return $this->options['is_safe_callback']($functionArgs);
108 }
109
110 return [];
111 }
112
113 public function isVariadic()
114 {
115 return $this->options['is_variadic'];
116 }
117
118 public function isDeprecated()
119 {
120 return (bool) $this->options['deprecated'];
121 }
122
123 public function getDeprecatedVersion()
124 {
125 return $this->options['deprecated'];
126 }
127
128 public function getAlternative()
129 {
130 return $this->options['alternative'];
131 }
132 }
133
134 // For Twig 1.x compatibility
135 class_alias('Twig\TwigFunction', 'Twig_SimpleFunction', false);
136
137 class_alias('Twig\TwigFunction', 'Twig_Function');
138
139 // Ensure that the aliased name is loaded to keep BC for classes implementing the typehint with the old aliased name.
140 class_exists('Twig\Node\Node');
141