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<?php |
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/* |
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* This file is part of Jitamin. |
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* |
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* Copyright (C) Jitamin Team |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Jitamin\Foundation\Filter; |
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/** |
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* Lexer. |
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*/ |
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class Lexer |
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{ |
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/** |
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* Current position. |
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* |
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* @var int |
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*/ |
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private $offset = 0; |
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/** |
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* Token map. |
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* |
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* @var array |
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*/ |
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private $tokenMap = [ |
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'/^(\s+)/' => 'T_WHITESPACE', |
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'/^([<=>]{0,2}[0-9]{4}-[0-9]{2}-[0-9]{2})/' => 'T_STRING', |
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'/^([<=>]{1,2}\w+)/u' => 'T_STRING', |
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'/^([<=>]{1,2}".+")/' => 'T_STRING', |
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'/^("(.+)")/' => 'T_STRING', |
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'/^(\S+)/u' => 'T_STRING', |
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'/^(#\d+)/' => 'T_STRING', |
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]; |
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/** |
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* Default token. |
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* |
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* @var string |
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*/ |
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private $defaultToken = ''; |
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/** |
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* Add token. |
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* |
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* @param string $regex |
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* @param string $token |
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* |
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* @return $this |
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*/ |
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public function addToken($regex, $token) |
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{ |
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$this->tokenMap = [$regex => $token] + $this->tokenMap; |
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return $this; |
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} |
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/** |
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* Set default token. |
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* |
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* @param string $token |
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* |
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* @return $this |
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*/ |
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public function setDefaultToken($token) |
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{ |
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$this->defaultToken = $token; |
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return $this; |
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} |
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/** |
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* Tokenize input string. |
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* |
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* @param string $input |
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* |
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* @return array |
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*/ |
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public function tokenize($input) |
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{ |
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$tokens = []; |
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$this->offset = 0; |
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$input_length = mb_strlen($input, 'UTF-8'); |
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while ($this->offset < $input_length) { |
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$result = $this->match(mb_substr($input, $this->offset, $input_length, 'UTF-8')); |
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if ($result === false) { |
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return []; |
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} |
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$tokens[] = $result; |
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} |
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return $this->map($tokens); |
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} |
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/** |
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* Find a token that match and move the offset. |
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* |
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* @param string $string |
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* |
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* @return array|bool |
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*/ |
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protected function match($string) |
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{ |
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foreach ($this->tokenMap as $pattern => $name) { |
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if (preg_match($pattern, $string, $matches)) { |
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$this->offset += mb_strlen($matches[1], 'UTF-8'); |
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return [ |
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'match' => str_replace('"', '', $matches[1]), |
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'token' => $name, |
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]; |
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} |
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} |
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return false; |
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} |
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/** |
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* Build map of tokens and matches. |
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* |
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* @param array $tokens |
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* |
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* @return array |
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*/ |
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protected function map(array $tokens) |
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{ |
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$map = []; |
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$leftOver = ''; |
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while (false !== ($token = current($tokens))) { |
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if ($token['token'] === 'T_STRING' || $token['token'] === 'T_WHITESPACE') { |
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$leftOver .= $token['match']; |
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} else { |
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$next = next($tokens); |
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if ($next !== false && $next['token'] === 'T_STRING') { |
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$map[$token['token']][] = $next['match']; |
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} |
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} |
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next($tokens); |
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} |
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$leftOver = trim($leftOver); |
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if ($this->defaultToken !== '' && $leftOver !== '') { |
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$map[$this->defaultToken] = [$leftOver]; |
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} |
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return $map; |
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} |
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} |
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Jitamin /
jitamin
