--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Twig-1.3.0/lib/Twig/Extension/Core.php Tue Oct 25 23:56:28 2011 +0200
@@ -0,0 +1,847 @@
+<?php
+
+if (!defined('ENT_SUBSTITUTE')) {
+ define('ENT_SUBSTITUTE', 8);
+}
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extension_Core extends Twig_Extension
+{
+ /**
+ * Returns the token parser instance to add to the existing list.
+ *
+ * @return array An array of Twig_TokenParser instances
+ */
+ public function getTokenParsers()
+ {
+ return array(
+ new Twig_TokenParser_For(),
+ new Twig_TokenParser_If(),
+ new Twig_TokenParser_Extends(),
+ new Twig_TokenParser_Include(),
+ new Twig_TokenParser_Block(),
+ new Twig_TokenParser_Use(),
+ new Twig_TokenParser_Filter(),
+ new Twig_TokenParser_Macro(),
+ new Twig_TokenParser_Import(),
+ new Twig_TokenParser_From(),
+ new Twig_TokenParser_Set(),
+ new Twig_TokenParser_Spaceless(),
+ );
+ }
+
+ /**
+ * Returns a list of filters to add to the existing list.
+ *
+ * @return array An array of filters
+ */
+ public function getFilters()
+ {
+ $filters = array(
+ // formatting filters
+ 'date' => new Twig_Filter_Function('twig_date_format_filter'),
+ 'format' => new Twig_Filter_Function('sprintf'),
+ 'replace' => new Twig_Filter_Function('twig_strtr'),
+
+ // encoding
+ 'url_encode' => new Twig_Filter_Function('twig_urlencode_filter'),
+ 'json_encode' => new Twig_Filter_Function('twig_jsonencode_filter'),
+
+ // string filters
+ 'title' => new Twig_Filter_Function('twig_title_string_filter', array('needs_environment' => true)),
+ 'capitalize' => new Twig_Filter_Function('twig_capitalize_string_filter', array('needs_environment' => true)),
+ 'upper' => new Twig_Filter_Function('strtoupper'),
+ 'lower' => new Twig_Filter_Function('strtolower'),
+ 'striptags' => new Twig_Filter_Function('strip_tags'),
+
+ // array helpers
+ 'join' => new Twig_Filter_Function('twig_join_filter'),
+ 'reverse' => new Twig_Filter_Function('twig_reverse_filter'),
+ 'length' => new Twig_Filter_Function('twig_length_filter', array('needs_environment' => true)),
+ 'sort' => new Twig_Filter_Function('twig_sort_filter'),
+ 'merge' => new Twig_Filter_Function('twig_array_merge'),
+
+ // iteration and runtime
+ 'default' => new Twig_Filter_Function('twig_default_filter'),
+ 'keys' => new Twig_Filter_Function('twig_get_array_keys_filter'),
+
+ // escaping
+ 'escape' => new Twig_Filter_Function('twig_escape_filter', array('needs_environment' => true, 'is_safe_callback' => 'twig_escape_filter_is_safe')),
+ 'e' => new Twig_Filter_Function('twig_escape_filter', array('needs_environment' => true, 'is_safe_callback' => 'twig_escape_filter_is_safe')),
+ );
+
+ if (function_exists('mb_get_info')) {
+ $filters['upper'] = new Twig_Filter_Function('twig_upper_filter', array('needs_environment' => true));
+ $filters['lower'] = new Twig_Filter_Function('twig_lower_filter', array('needs_environment' => true));
+ }
+
+ return $filters;
+ }
+
+ /**
+ * Returns a list of global functions to add to the existing list.
+ *
+ * @return array An array of global functions
+ */
+ public function getFunctions()
+ {
+ return array(
+ 'range' => new Twig_Function_Function('range'),
+ 'constant' => new Twig_Function_Function('constant'),
+ 'cycle' => new Twig_Function_Function('twig_cycle'),
+ );
+ }
+
+ /**
+ * Returns a list of filters to add to the existing list.
+ *
+ * @return array An array of filters
+ */
+ public function getTests()
+ {
+ return array(
+ 'even' => new Twig_Test_Function('twig_test_even'),
+ 'odd' => new Twig_Test_Function('twig_test_odd'),
+ 'defined' => new Twig_Test_Function('twig_test_defined'),
+ 'sameas' => new Twig_Test_Function('twig_test_sameas'),
+ 'none' => new Twig_Test_Function('twig_test_none'),
+ 'null' => new Twig_Test_Function('twig_test_none'),
+ 'divisibleby' => new Twig_Test_Function('twig_test_divisibleby'),
+ 'constant' => new Twig_Test_Function('twig_test_constant'),
+ 'empty' => new Twig_Test_Function('twig_test_empty'),
+ );
+ }
+
+ /**
+ * Returns a list of operators to add to the existing list.
+ *
+ * @return array An array of operators
+ */
+ public function getOperators()
+ {
+ return array(
+ array(
+ 'not' => array('precedence' => 50, 'class' => 'Twig_Node_Expression_Unary_Not'),
+ '-' => array('precedence' => 50, 'class' => 'Twig_Node_Expression_Unary_Neg'),
+ '+' => array('precedence' => 50, 'class' => 'Twig_Node_Expression_Unary_Pos'),
+ ),
+ array(
+ 'b-and' => array('precedence' => 5, 'class' => 'Twig_Node_Expression_Binary_BitwiseAnd', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ 'b-xor' => array('precedence' => 5, 'class' => 'Twig_Node_Expression_Binary_BitwiseXor', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ 'b-or' => array('precedence' => 5, 'class' => 'Twig_Node_Expression_Binary_BitwiseOr', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ 'or' => array('precedence' => 10, 'class' => 'Twig_Node_Expression_Binary_Or', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ 'and' => array('precedence' => 15, 'class' => 'Twig_Node_Expression_Binary_And', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '==' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_Equal', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '!=' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_NotEqual', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '<' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_Less', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '>' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_Greater', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '>=' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_GreaterEqual', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '<=' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_LessEqual', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ 'not in' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_NotIn', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ 'in' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_In', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '+' => array('precedence' => 30, 'class' => 'Twig_Node_Expression_Binary_Add', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '-' => array('precedence' => 30, 'class' => 'Twig_Node_Expression_Binary_Sub', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '~' => array('precedence' => 40, 'class' => 'Twig_Node_Expression_Binary_Concat', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '*' => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_Mul', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '/' => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_Div', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '//' => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_FloorDiv', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '%' => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_Mod', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ 'is' => array('precedence' => 100, 'callable' => array($this, 'parseTestExpression'), 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ 'is not' => array('precedence' => 100, 'callable' => array($this, 'parseNotTestExpression'), 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '..' => array('precedence' => 110, 'class' => 'Twig_Node_Expression_Binary_Range', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+ '**' => array('precedence' => 200, 'class' => 'Twig_Node_Expression_Binary_Power', 'associativity' => Twig_ExpressionParser::OPERATOR_RIGHT),
+ ),
+ );
+ }
+
+ public function parseNotTestExpression(Twig_Parser $parser, $node)
+ {
+ return new Twig_Node_Expression_Unary_Not($this->parseTestExpression($parser, $node), $parser->getCurrentToken()->getLine());
+ }
+
+ public function parseTestExpression(Twig_Parser $parser, $node)
+ {
+ $stream = $parser->getStream();
+ $name = $stream->expect(Twig_Token::NAME_TYPE);
+ $arguments = null;
+ if ($stream->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+ $arguments = $parser->getExpressionParser()->parseArguments();
+ }
+
+ return new Twig_Node_Expression_Test($node, $name->getValue(), $arguments, $parser->getCurrentToken()->getLine());
+ }
+
+ /**
+ * Returns the name of the extension.
+ *
+ * @return string The extension name
+ */
+ public function getName()
+ {
+ return 'core';
+ }
+}
+
+/**
+ * Cycles over a value.
+ *
+ * @param ArrayAccess|array $values An array or an ArrayAccess instance
+ * @param integer $i The cycle value
+ *
+ * @return string The next value in the cycle
+ */
+function twig_cycle($values, $i)
+{
+ if (!is_array($values) && !$values instanceof ArrayAccess) {
+ return $values;
+ }
+
+ return $values[$i % count($values)];
+}
+
+/**
+ * Converts a date to the given format.
+ *
+ * <pre>
+ * {{ post.published_at|date("m/d/Y") }}
+ * </pre>
+ *
+ * @param DateTime|string $date A date
+ * @param string $format A format
+ * @param DateTimeZone|string $timezone A timezone
+ *
+ * @return string The formatter date
+ */
+function twig_date_format_filter($date, $format = 'F j, Y H:i', $timezone = null)
+{
+ if (!$date instanceof DateTime && !$date instanceof DateInterval) {
+ if (ctype_digit((string) $date)) {
+ $date = new DateTime('@'.$date);
+ $date->setTimezone(new DateTimeZone(date_default_timezone_get()));
+ } else {
+ $date = new DateTime($date);
+ }
+ }
+
+ if (null !== $timezone) {
+ if (!$timezone instanceof DateTimeZone) {
+ $timezone = new DateTimeZone($timezone);
+ }
+
+ $date->setTimezone($timezone);
+ }
+
+ return $date->format($format);
+}
+
+/**
+ * URL encodes a string.
+ *
+ * @param string $url A URL
+ * @param bool $raw true to use rawurlencode() instead of urlencode
+ *
+ * @return string The URL encoded value
+ */
+function twig_urlencode_filter($url, $raw = false)
+{
+ if ($raw) {
+ return rawurlencode($url);
+ }
+
+ return urlencode($url);
+}
+
+if (version_compare(PHP_VERSION, '5.3.0', '<')) {
+ /**
+ * JSON encodes a PHP variable.
+ *
+ * @param mixed $value The value to encode.
+ * @param integer $options Not used on PHP 5.2.x
+ *
+ * @return mixed The JSON encoded value
+ */
+ function twig_jsonencode_filter($value, $options = 0)
+ {
+ if ($value instanceof Twig_Markup) {
+ $value = (string) $value;
+ } elseif (is_array($value)) {
+ array_walk_recursive($value, '_twig_markup2string');
+ }
+
+ return json_encode($value);
+ }
+} else {
+ /**
+ * JSON encodes a PHP variable.
+ *
+ * @param mixed $value The value to encode.
+ * @param integer $options Bitmask consisting of JSON_HEX_QUOT, JSON_HEX_TAG, JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK, JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, JSON_FORCE_OBJECT
+ *
+ * @return mixed The JSON encoded value
+ */
+ function twig_jsonencode_filter($value, $options = 0)
+ {
+ if ($value instanceof Twig_Markup) {
+ $value = (string) $value;
+ } elseif (is_array($value)) {
+ array_walk_recursive($value, '_twig_markup2string');
+ }
+
+ return json_encode($value, $options);
+ }
+}
+
+function _twig_markup2string(&$value)
+{
+ if ($value instanceof Twig_Markup) {
+ $value = (string) $value;
+ }
+}
+
+/**
+ * Merges an array with another one.
+ *
+ * <pre>
+ * {% set items = { 'apple': 'fruit', 'orange': 'fruit' } %}
+ *
+ * {% set items = items|merge({ 'peugeot': 'car' }) %}
+ *
+ * {# items now contains { 'apple': 'fruit', 'orange': 'fruit', 'peugeot': 'car' } #}
+ * </pre>
+ *
+ * @param array $arr1 An array
+ * @param array $arr2 An array
+ *
+ * @return array The merged array
+ */
+function twig_array_merge($arr1, $arr2)
+{
+ if (!is_array($arr1) || !is_array($arr2)) {
+ throw new Twig_Error_Runtime('The merge filter only work with arrays or hashes.');
+ }
+
+ return array_merge($arr1, $arr2);
+}
+
+/**
+ * Joins the values to a string.
+ *
+ * The separator between elements is an empty string per default, you can define it with the optional parameter.
+ *
+ * <pre>
+ * {{ [1, 2, 3]|join('|') }}
+ * {# returns 1|2|3 #}
+ *
+ * {{ [1, 2, 3]|join }}
+ * {# returns 123 #}
+ * </pre>
+ *
+ * @param array $value An array
+ * @param string $glue The separator
+ *
+ * @return string The concatenated string
+ */
+function twig_join_filter($value, $glue = '')
+{
+ return implode($glue, (array) $value);
+}
+
+/**
+ * Returns the value or the default value when it is undefined or empty.
+ *
+ * <pre>
+ *
+ * {{ var.foo|default('foo item on var is not defined') }}
+ *
+ * </pre>
+ *
+ * @param mixed $value A value
+ * @param mixed $default The default value
+ *
+ * @param mixed The value or the default value;
+ */
+function twig_default_filter($value, $default = '')
+{
+ if (twig_test_empty($value)) {
+ return $default;
+ } else {
+ return $value;
+ }
+}
+
+/**
+ * Returns the keys for the given array.
+ *
+ * It is useful when you want to iterate over the keys of an array:
+ *
+ * <pre>
+ * {% for key in array|keys %}
+ * {# ... #}
+ * {% endfor %}
+ * </pre>
+ *
+ * @param array $array An array
+ *
+ * @return array The keys
+ */
+function twig_get_array_keys_filter($array)
+{
+ if (is_object($array) && $array instanceof Traversable) {
+ return array_keys(iterator_to_array($array));
+ }
+
+ if (!is_array($array)) {
+ return array();
+ }
+
+ return array_keys($array);
+}
+
+/**
+ * Reverses an array.
+ *
+ * @param array|Traversable $array An array or a Traversable instance
+ *
+ * return array The array reversed
+ */
+function twig_reverse_filter($array)
+{
+ if (is_object($array) && $array instanceof Traversable) {
+ return array_reverse(iterator_to_array($array));
+ }
+
+ if (!is_array($array)) {
+ return array();
+ }
+
+ return array_reverse($array);
+}
+
+/**
+ * Sorts an array.
+ *
+ * @param array $array An array
+ */
+function twig_sort_filter($array)
+{
+ asort($array);
+
+ return $array;
+}
+
+/* used internally */
+function twig_in_filter($value, $compare)
+{
+ if (is_array($compare)) {
+ return in_array($value, $compare);
+ } elseif (is_string($compare)) {
+ return false !== strpos($compare, (string) $value);
+ } elseif (is_object($compare) && $compare instanceof Traversable) {
+ return in_array($value, iterator_to_array($compare, false));
+ }
+
+ return false;
+}
+
+/**
+ * Replaces placeholders in a string.
+ *
+ * <pre>
+ * {{ "I like %this% and %that%."|replace({'%this%': foo, '%that%': "bar"}) }}
+ * </pre>
+ *
+ * @param string $pattern A string
+ * @param string $replacements The values for the placeholders
+ *
+ * @return string The string where the placeholders have been replaced
+ */
+function twig_strtr($pattern, $replacements)
+{
+ return str_replace(array_keys($replacements), array_values($replacements), $pattern);
+}
+
+/**
+ * Escapes a string.
+ *
+ * @param Twig_Environment $env A Twig_Environment instance
+ * @param string $string The value to be escaped
+ * @param string $type The escaping strategy
+ * @param string $charset The charset
+ * @param Boolean $autoescape Whether the function is called by the auto-escaping feature (true) or by the developer (false)
+ */
+function twig_escape_filter(Twig_Environment $env, $string, $type = 'html', $charset = null, $autoescape = false)
+{
+ if ($autoescape && is_object($string) && $string instanceof Twig_Markup) {
+ return $string;
+ }
+
+ if (!is_string($string) && !(is_object($string) && method_exists($string, '__toString'))) {
+ return $string;
+ }
+
+ if (null === $charset) {
+ $charset = $env->getCharset();
+ }
+
+ switch ($type) {
+ case 'js':
+ // escape all non-alphanumeric characters
+ // into their \xHH or \uHHHH representations
+ if ('UTF-8' != $charset) {
+ $string = _twig_convert_encoding($string, 'UTF-8', $charset);
+ }
+
+ if (null === $string = preg_replace_callback('#[^\p{L}\p{N} ]#u', '_twig_escape_js_callback', $string)) {
+ throw new Twig_Error_Runtime('The string to escape is not a valid UTF-8 string.');
+ }
+
+ if ('UTF-8' != $charset) {
+ $string = _twig_convert_encoding($string, $charset, 'UTF-8');
+ }
+
+ return $string;
+
+ case 'html':
+ return htmlspecialchars($string, ENT_QUOTES | ENT_SUBSTITUTE, $charset);
+
+ default:
+ throw new Twig_Error_Runtime(sprintf('Invalid escape type "%s".', $type));
+ }
+}
+
+/* used internally */
+function twig_escape_filter_is_safe(Twig_Node $filterArgs)
+{
+ foreach ($filterArgs as $arg) {
+ if ($arg instanceof Twig_Node_Expression_Constant) {
+ return array($arg->getAttribute('value'));
+ } else {
+ return array();
+ }
+
+ break;
+ }
+
+ return array('html');
+}
+
+if (function_exists('iconv')) {
+ function _twig_convert_encoding($string, $to, $from)
+ {
+ return iconv($from, $to, $string);
+ }
+} elseif (function_exists('mb_convert_encoding')) {
+ function _twig_convert_encoding($string, $to, $from)
+ {
+ return mb_convert_encoding($string, $to, $from);
+ }
+} else {
+ function _twig_convert_encoding($string, $to, $from)
+ {
+ throw new Twig_Error_Runtime('No suitable convert encoding function (use UTF-8 as your encoding or install the iconv or mbstring extension).');
+ }
+}
+
+function _twig_escape_js_callback($matches)
+{
+ $char = $matches[0];
+
+ // \xHH
+ if (!isset($char[1])) {
+ return '\\x'.substr('00'.bin2hex($char), -2);
+ }
+
+ // \uHHHH
+ $char = _twig_convert_encoding($char, 'UTF-16BE', 'UTF-8');
+
+ return '\\u'.substr('0000'.bin2hex($char), -4);
+}
+
+// add multibyte extensions if possible
+if (function_exists('mb_get_info')) {
+ /**
+ * Returns the length of a PHP variable.
+ *
+ * @param Twig_Environment $env A Twig_Environment instance
+ * @param mixed $thing A PHP variable
+ *
+ * @return integer The length of the value
+ */
+ function twig_length_filter(Twig_Environment $env, $thing)
+ {
+ return is_scalar($thing) ? mb_strlen($thing, $env->getCharset()) : count($thing);
+ }
+
+ /**
+ * Converts a string to uppercase.
+ *
+ * @param Twig_Environment $env A Twig_Environment instance
+ * @param string $string A string
+ *
+ * @return string The uppercased string
+ */
+ function twig_upper_filter(Twig_Environment $env, $string)
+ {
+ if (null !== ($charset = $env->getCharset())) {
+ return mb_strtoupper($string, $charset);
+ }
+
+ return strtoupper($string);
+ }
+
+ /**
+ * Converts a string to lowercase.
+ *
+ * @param Twig_Environment $env A Twig_Environment instance
+ * @param string $string A string
+ *
+ * @return string The lowercased string
+ */
+ function twig_lower_filter(Twig_Environment $env, $string)
+ {
+ if (null !== ($charset = $env->getCharset())) {
+ return mb_strtolower($string, $charset);
+ }
+
+ return strtolower($string);
+ }
+
+ /**
+ * Returns a titlecased string.
+ *
+ * @param Twig_Environment $env A Twig_Environment instance
+ * @param string $string A string
+ *
+ * @return string The titlecased string
+ */
+ function twig_title_string_filter(Twig_Environment $env, $string)
+ {
+ if (null !== ($charset = $env->getCharset())) {
+ return mb_convert_case($string, MB_CASE_TITLE, $charset);
+ }
+
+ return ucwords(strtolower($string));
+ }
+
+ /**
+ * Returns a capitalized string.
+ *
+ * @param Twig_Environment $env A Twig_Environment instance
+ * @param string $string A string
+ *
+ * @return string The capitalized string
+ */
+ function twig_capitalize_string_filter(Twig_Environment $env, $string)
+ {
+ if (null !== ($charset = $env->getCharset())) {
+ return mb_strtoupper(mb_substr($string, 0, 1, $charset), $charset).
+ mb_strtolower(mb_substr($string, 1, mb_strlen($string, $charset), $charset), $charset);
+ }
+
+ return ucfirst(strtolower($string));
+ }
+}
+// and byte fallback
+else
+{
+ /**
+ * Returns the length of a PHP variable.
+ *
+ * @param Twig_Environment $env A Twig_Environment instance
+ * @param mixed $thing A PHP variable
+ *
+ * @return integer The length of the value
+ */
+ function twig_length_filter(Twig_Environment $env, $thing)
+ {
+ return is_scalar($thing) ? strlen($thing) : count($thing);
+ }
+
+ /**
+ * Returns a titlecased string.
+ *
+ * @param Twig_Environment $env A Twig_Environment instance
+ * @param string $string A string
+ *
+ * @return string The titlecased string
+ */
+ function twig_title_string_filter(Twig_Environment $env, $string)
+ {
+ return ucwords(strtolower($string));
+ }
+
+ /**
+ * Returns a capitalized string.
+ *
+ * @param Twig_Environment $env A Twig_Environment instance
+ * @param string $string A string
+ *
+ * @return string The capitalized string
+ */
+ function twig_capitalize_string_filter(Twig_Environment $env, $string)
+ {
+ return ucfirst(strtolower($string));
+ }
+}
+
+/* used internally */
+function twig_ensure_traversable($seq)
+{
+ if (is_array($seq) || (is_object($seq) && $seq instanceof Traversable)) {
+ return $seq;
+ } else {
+ return array();
+ }
+}
+
+/**
+ * Checks that a variable points to the same memory address than another one.
+ *
+ * <pre>
+ * {% if foo.attribute is sameas(false) %}
+ * the foo attribute really is the ``false`` PHP value
+ * {% endif %}
+ * </pre>
+ *
+ * @param mixed $value A PHP variable
+ * @param mixed $test The PHP variable to test against
+ *
+ * @return Boolean true if the values are the same, false otherwise
+ */
+function twig_test_sameas($value, $test)
+{
+ return $value === $test;
+}
+
+/**
+ * Checks that a variable is null.
+ *
+ * <pre>
+ * {{ var is none }}
+ * </pre>
+ *
+ * @param mixed $value a PHP variable.
+ *
+ * @return Boolean true if the value is null, false otherwise
+ */
+function twig_test_none($value)
+{
+ return null === $value;
+}
+
+/**
+ * Checks if a variable is divisible by a number.
+ *
+ * <pre>
+ * {% if loop.index is divisibleby(3) %}
+ * </pre>
+ *
+ * @param integer $value A PHP value
+ * @param integer $num A number
+ *
+ * @return Boolean true if the value is divisible by the number, false otherwise
+ */
+function twig_test_divisibleby($value, $num)
+{
+ return 0 == $value % $num;
+}
+
+/**
+ * Checks if a number is even.
+ *
+ * <pre>
+ * {{ var is even }}
+ * </pre>
+ *
+ * @param integer $value An integer
+ *
+ * @return Boolean true if the value is even, false otherwise
+ */
+function twig_test_even($value)
+{
+ return $value % 2 == 0;
+}
+
+/**
+ * Checks if a number is odd.
+ *
+ * <pre>
+ * {{ var is odd }}
+ * </pre>
+ *
+ * @param integer $value An integer
+ *
+ * @return Boolean true if the value is odd, false otherwise
+ */
+function twig_test_odd($value)
+{
+ return $value % 2 == 1;
+}
+
+/**
+ * Checks if a variable is the exact same value as a constant.
+ *
+ * <pre>
+ * {% if post.status is constant('Post::PUBLISHED') %}
+ * the status attribute is exactly the same as Post::PUBLISHED
+ * {% endif %}
+ * </pre>
+ *
+ * @param mixed $value A PHP value
+ * @param mixed $constant The constant to test against
+ *
+ * @return Boolean true if the value is the same as the constant, false otherwise
+ */
+function twig_test_constant($value, $constant)
+{
+ return constant($constant) === $value;
+}
+
+/**
+ * Checks if a variable is defined in the current context.
+ *
+ * <pre>
+ * {# defined works with variable names #}
+ * {% if foo is defined %}
+ * {# ... #}
+ * {% endif %}
+ * </pre>
+ *
+ * @param mixed $name A PHP variable
+ * @param array $context The current context
+ *
+ * @return Boolean true if the value is defined, false otherwise
+ */
+function twig_test_defined($name, $context)
+{
+ return array_key_exists($name, $context);
+}
+
+/**
+ * Checks if a variable is empty.
+ *
+ * <pre>
+ * {# evaluates to true if the foo variable is null, false, or the empty string #}
+ * {% if foo is empty %}
+ * {# ... #}
+ * {% endif %}
+ * </pre>
+ *
+ * @param mixed $value A PHP variable
+ *
+ * @return Boolean true if the value is empty, false otherwise
+ */
+function twig_test_empty($value)
+{
+ if ($value instanceof Countable) {
+ return 0 == count($value);
+ }
+ return false === $value || (empty($value) && '0' != $value);
+}