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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2017 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\TextFormatter\Plugins\Litedown\Parser; |
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use s9e\TextFormatter\Parser; |
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abstract class AbstractParser |
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{ |
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/** |
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* @var Parser |
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*/ |
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protected $parser; |
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/** |
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* @var string Text being parsed |
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*/ |
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protected $text; |
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/** |
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* @param Parser $parser |
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*/ |
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public function __construct(Parser $parser) |
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{ |
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$this->parser = $parser; |
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} |
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/** |
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* Parse given text |
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* |
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* @param string $text |
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* @return string |
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*/ |
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public function parse($text) |
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{ |
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$this->text = $text; |
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$this->execute(); |
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// Remove the local copy of the text to release its memory |
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$text = $this->text; |
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unset($this->text); |
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return $text; |
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} |
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/** |
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* Execute this parser on stored text |
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* |
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* @return void |
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*/ |
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abstract protected function execute(); |
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/** |
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* Test whether given position is preceded by whitespace |
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* |
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* @param integer $pos |
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* @return bool |
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*/ |
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protected function isAfterWhitespace($pos) |
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{ |
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return ($pos > 0 && $this->isWhitespace($this->text[$pos - 1])); |
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} |
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/** |
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* Test whether given character is alphanumeric |
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* |
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* @param string $chr |
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* @return bool |
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*/ |
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protected function isAlnum($chr) |
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{ |
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return (strpos(' abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789', $chr) > 0); |
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} |
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/** |
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* Test whether given position is followed by whitespace |
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* |
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* @param integer $pos |
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* @return bool |
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*/ |
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protected function isBeforeWhitespace($pos) |
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{ |
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return $this->isWhitespace($this->text[$pos + 1]); |
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} |
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/** |
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* Test whether a length of text is surrounded by alphanumeric characters |
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* |
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* @param integer $matchPos Start of the text |
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* @param integer $matchLen Length of the text |
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* @return bool |
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*/ |
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protected function isSurroundedByAlnum($matchPos, $matchLen) |
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{ |
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return ($matchPos > 0 && $this->isAlnum($this->text[$matchPos - 1]) && $this->isAlnum($this->text[$matchPos + $matchLen])); |
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} |
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/** |
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* Test whether given character is an ASCII whitespace character |
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* |
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* NOTE: newlines are normalized to LF before parsing so we don't have to check for CR |
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* |
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* @param string $chr |
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* @return bool |
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*/ |
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protected function isWhitespace($chr) |
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{ |
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return (strpos(" \n\t", $chr) !== false); |
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} |
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/** |
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* Overwrite part of the text with substitution characters ^Z (0x1A) |
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* |
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* @param integer $pos Start of the range |
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* @param integer $len Length of text to overwrite |
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* @return void |
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*/ |
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protected function overwrite($pos, $len) |
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{ |
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if ($len > 0) |
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{ |
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$this->text = substr($this->text, 0, $pos) . str_repeat("\x1A", $len) . substr($this->text, $pos + $len); |
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} |
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} |
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} |
s9e /
TextFormatter
