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<?php |
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namespace idiorm\orm; |
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/** |
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* A class to handle str_replace operations that involve quoted strings |
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* |
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* @example IdiormString::str_replace_outside_quotes('?', '%s', 'columnA = "Hello?" AND columnB = ?'); |
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* @example IdiormString::value('columnA = "Hello?" AND columnB = ?')->replace_outside_quotes('?', '%s'); |
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* @author Jeff Roberson <[email protected]> |
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* @author Simon Holywell <[email protected]> |
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* @link http://stackoverflow.com/a/13370709/461813 StackOverflow answer |
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*/ |
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class IdiormString |
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{ |
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/** |
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* @var string |
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*/ |
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protected $subject; |
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/** |
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* @var string |
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*/ |
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protected $search; |
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/** |
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* @var string |
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*/ |
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protected $replace; |
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/** |
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* Get an easy to use instance of the class |
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* |
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* @param string $subject |
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* |
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* @return \static |
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*/ |
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public static function value($subject) |
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{ |
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return new static($subject); |
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} |
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/** |
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* Shortcut method: Replace all occurrences of the search string with the replacement |
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* string where they appear outside quotes. |
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* |
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* @param string $search |
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* @param string $replace |
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* @param string $subject |
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* |
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* @return string |
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*/ |
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public static function str_replace_outside_quotes($search, $replace, $subject) |
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{ |
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return static::value($subject)->replace_outside_quotes($search, $replace); |
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} |
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/** |
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* Set the base string object |
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* |
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* @param string $subject |
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*/ |
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public function __construct($subject) |
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{ |
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$this->subject = (string)$subject; |
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} |
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/** |
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* Replace all occurrences of the search string with the replacement |
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* string where they appear outside quotes |
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* |
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* @param string $search |
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* @param string $replace |
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* |
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* @return string |
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*/ |
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public function replace_outside_quotes($search, $replace) |
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{ |
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$this->search = $search; |
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$this->replace = $replace; |
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return $this->_str_replace_outside_quotes(); |
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} |
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/** |
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* Validate an input string and perform a replace on all occurrences |
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* of $this->search with $this->replace |
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* |
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* @author Jeff Roberson <[email protected]> |
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* @link http://stackoverflow.com/a/13370709/461813 StackOverflow answer |
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* |
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* @return string |
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* |
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* @throws IdiormStringException |
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*/ |
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protected function _str_replace_outside_quotes() |
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{ |
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$re_valid = '/ |
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# Validate string having embedded quoted substrings. |
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^ # Anchor to start of string. |
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(?: # Zero or more string chunks. |
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"[^"\\\\]*(?:\\\\.[^"\\\\]*)*" # Either a double quoted chunk, |
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| \'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\' # or a single quoted chunk, |
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| [^\'"\\\\]+ # or an unquoted chunk (no escapes). |
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)* # Zero or more string chunks. |
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\z # Anchor to end of string. |
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/sx'; |
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if (!preg_match($re_valid, $this->subject)) { |
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throw new IdiormStringException('Subject string is not valid in the replace_outside_quotes context.'); |
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} |
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$re_parse = '/ |
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# Match one chunk of a valid string having embedded quoted substrings. |
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( # Either $1: Quoted chunk. |
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"[^"\\\\]*(?:\\\\.[^"\\\\]*)*" # Either a double quoted chunk, |
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| \'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\' # or a single quoted chunk. |
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) # End $1: Quoted chunk. |
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| ([^\'"\\\\]+) # or $2: an unquoted chunk (no escapes). |
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/sx'; |
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return (string)preg_replace_callback($re_parse, array($this, '_str_replace_outside_quotes_cb'), $this->subject); |
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} |
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/** |
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* Process each matching chunk from preg_replace_callback replacing |
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* each occurrence of $this->search with $this->replace |
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* |
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* @author Jeff Roberson <[email protected]> |
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* @link http://stackoverflow.com/a/13370709/461813 StackOverflow answer |
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* |
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* @param array $matches |
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* |
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* @return string |
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*/ |
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protected function _str_replace_outside_quotes_cb($matches) |
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{ |
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// Return quoted string chunks (in group $1) unaltered. |
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if ($matches[1]) { |
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return $matches[1]; |
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} |
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// Process only unquoted chunks (in group $2). |
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return (string)preg_replace('/' . preg_quote($this->search, '/') . '/', $this->replace, $matches[2]); |
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} |
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} |
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voku /
idiorm
