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Regexp.php
001 <?php
002
003 /**
004 * @package s9e\TextFormatter
005 * @copyright Copyright (c) 2010-2022 The s9e authors
006 * @license http://www.opensource.org/licenses/mit-license.php The MIT License
007 */
008 namespace s9e\TextFormatter\Configurator\Items;
009
010 use InvalidArgumentException;
011 use s9e\TextFormatter\Configurator\ConfigProvider;
012 use s9e\TextFormatter\Configurator\FilterableConfigValue;
013 use s9e\TextFormatter\Configurator\Helpers\RegexpParser;
014 use s9e\TextFormatter\Configurator\JavaScript\Code;
015 use s9e\TextFormatter\Configurator\JavaScript\RegexpConvertor;
016
017 class Regexp implements ConfigProvider, FilterableConfigValue
018 {
019 /**
020 * @var bool Whether this regexp should have the global flag set in JavaScript
021 */
022 protected $isGlobal;
023
024 /**
025 * @var string JavaScript regexp, with delimiters and modifiers, e.g. "/foo/i"
026 */
027 protected $jsRegexp;
028
029 /**
030 * @var string PCRE regexp, with delimiters and modifiers, e.g. "/foo/i"
031 */
032 protected $regexp;
033
034 /**
035 * Constructor
036 *
037 * @param string $regexp PCRE regexp, with delimiters and modifiers, e.g. "/foo/i"
038 * @param bool $isGlobal Whether this regexp should have the global flag set in JavaScript
039 */
040 public function __construct($regexp, $isGlobal = false)
041 {
042 if (@preg_match($regexp, '') === false)
043 {
044 throw new InvalidArgumentException('Invalid regular expression ' . var_export($regexp, true));
045 }
046
047 $this->regexp = $regexp;
048 $this->isGlobal = $isGlobal;
049 }
050
051 /**
052 * Return this regexp as a string
053 *
054 * @return string
055 */
056 public function __toString()
057 {
058 return $this->regexp;
059 }
060
061 /**
062 * {@inheritdoc}
063 */
064 public function asConfig()
065 {
066 return $this;
067 }
068
069 /**
070 * {@inheritdoc}
071 */
072 public function filterConfig($target)
073 {
074 return ($target === 'JS') ? new Code($this->getJS()) : (string) $this;
075 }
076
077 /**
078 * Return the name of each capture in this regexp
079 *
080 * @return string[]
081 */
082 public function getCaptureNames()
083 {
084 return RegexpParser::getCaptureNames($this->regexp);
085 }
086
087 /**
088 * Return this regexp's JavaScript representation
089 *
090 * @return string
091 */
092 public function getJS()
093 {
094 if (!isset($this->jsRegexp))
095 {
096 $this->jsRegexp = RegexpConvertor::toJS($this->regexp, $this->isGlobal);
097 }
098
099 return $this->jsRegexp;
100 }
101
102 /**
103 * Return all the named captures with a standalone regexp that matches them
104 *
105 * @return array Array of [capture name => regexp]
106 */
107 public function getNamedCaptures()
108 {
109 $captures = [];
110 $regexpInfo = RegexpParser::parse($this->regexp);
111
112 // Prepare the start/end of the regexp and ensure that we use the D modifier
113 $start = $regexpInfo['delimiter'] . '^';
114 $end = '$' . $regexpInfo['delimiter'] . $regexpInfo['modifiers'];
115 if (strpos($regexpInfo['modifiers'], 'D') === false)
116 {
117 $end .= 'D';
118 }
119
120 foreach ($this->getNamedCapturesExpressions($regexpInfo['tokens']) as $name => $expr)
121 {
122 $captures[$name] = $start . $expr . $end;
123 }
124
125 return $captures;
126 }
127
128 /**
129 * Return the expression used in each named capture
130 *
131 * @param array[] $tokens
132 * @return array
133 */
134 protected function getNamedCapturesExpressions(array $tokens)
135 {
136 $exprs = [];
137 foreach ($tokens as $token)
138 {
139 if ($token['type'] !== 'capturingSubpatternStart' || !isset($token['name']))
140 {
141 continue;
142 }
143
144 $expr = $token['content'];
145 if (strpos($expr, '|') !== false)
146 {
147 $expr = '(?:' . $expr . ')';
148 }
149
150 $exprs[$token['name']] = $expr;
151 }
152
153 return $exprs;
154 }
155
156 /**
157 * Set this regexp's JavaScript representation
158 *
159 * @param string $jsRegexp
160 * @return void
161 */
162 public function setJS($jsRegexp)
163 {
164 $this->jsRegexp = $jsRegexp;
165 }
166 }