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<?php
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/**
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* Specialized string class for phpMyAdmin.
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* The SQL Parser code relies heavily on these functions.
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*
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* @package PhpMyAdmin-String
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*/
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/**
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* Specialized string class for phpMyAdmin.
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* The SQL Parser code relies heavily on these functions.
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*
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* @package PhpMyAdmin-String
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*/
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class PMA_String
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{
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/**
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* @var PMA_StringType
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*/
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private $_type;
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/**
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* @var PMA_StringByte
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*/
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private $_byte;
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/**
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* Constructor
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*/
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public function __construct()
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{
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if (@function_exists('mb_strlen')) {
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mb_internal_encoding('utf-8');
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include_once 'libraries/StringMB.class.php';
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$this->_byte = new PMA_StringMB();
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} else {
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include_once 'libraries/StringNative.class.php';
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$this->_byte = new PMA_StringNative();
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}
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if (@extension_loaded('ctype')) {
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include_once 'libraries/StringCType.class.php';
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$this->_type = new PMA_StringCType();
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} else {
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include_once 'libraries/StringNativeType.class.php';
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$this->_type = new PMA_StringNativeType();
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}
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}
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/**
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* Checks if a given character position in the string is escaped or not
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*
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* @param string $string string to check for
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* @param integer $pos the character to check for
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* @param integer $start starting position in the string
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*
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* @return boolean whether the character is escaped or not
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*/
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public function charIsEscaped($string, $pos, $start = 0)
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{
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$pos = max(intval($pos), 0);
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$start = max(intval($start), 0);
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$len = $this->strlen($string);
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// Base case:
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// Check for string length or invalid input or special case of input
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// (pos == $start)
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if ($pos <= $start || $len <= max($pos, $start)) {
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return false;
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}
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$pos--;
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$escaped = false;
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while ($pos >= $start && $this->substr($string, $pos, 1) == '\\') {
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$escaped = !$escaped;
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$pos--;
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} // end while
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return $escaped;
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}
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/**
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* Checks if a character is an SQL identifier
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*
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* @param string $c character to check for
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* @param boolean $dot_is_valid whether the dot character is valid or not
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*
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* @return boolean whether the character is an SQL identifier or not
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*/
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public function isSqlIdentifier($c, $dot_is_valid = false)
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{
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return ($this->isAlnum($c)
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|| ($ord_c = $this->ord($c)) && $ord_c >= 192 && $ord_c != 215 &&
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$ord_c != 249
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|| $c == '_'
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|| $c == '$'
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|| ($dot_is_valid != false && $c == '.'));
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}
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/**
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* Returns length of string depending on current charset.
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*
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* @param string $string string to count
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*
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* @return int string length
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*/
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public function strlen($string)
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{
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return $this->_byte->strlen($string);
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}
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/**
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* Returns substring from string, works depending on current charset.
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*
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* @param string $string string to count
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* @param int $start start of substring
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* @param int $length length of substring
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*
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* @return string the sub string
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*/
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public function substr($string, $start, $length = 2147483647)
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{
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return $this->_byte->substr($string, $start, $length);
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}
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/**
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* Returns postion of $needle in $haystack or false if not found
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*
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* @param string $haystack the string being checked
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* @param string $needle the string to find in haystack
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* @param int $offset the search offset
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*
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* @return integer position of $needle in $haystack or false
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*/
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public function strpos($haystack, $needle, $offset = 0)
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{
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return $this->_byte->strpos($haystack, $needle, $offset);
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}
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/**
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* Make a string lowercase
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*
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* @param string $string the string being lowercased
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*
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* @return string the lower case string
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*/
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public function strtolower($string)
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{
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return $this->_byte->strtolower($string);
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}
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/**
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* Get the ordinal value of a string
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*
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* @param string $string the string for which ord is required
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*
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* @return string the ord value
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*/
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public function ord($string)
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{
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return $this->_byte->ord($string);
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}
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/**
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* Checks if a character is an alphanumeric one
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*
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* @param string $c character to check for
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*
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* @return boolean whether the character is an alphanumeric one or not
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*/
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public function isAlnum($c)
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{
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return $this->_type->isAlnum($c);
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}
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/**
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* Checks if a character is an alphabetic one
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*
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* @param string $c character to check for
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*
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* @return boolean whether the character is an alphabetic one or not
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*/
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public function isAlpha($c)
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{
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return $this->_type->isAlpha($c);
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}
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/**
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* Checks if a character is a digit
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*
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* @param string $c character to check for
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*
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* @return boolean whether the character is a digit or not
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*/
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public function isDigit($c)
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{
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return $this->_type->isDigit($c);
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}
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/**
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* Checks if a character is an upper alphabetic one
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*
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* @param string $c character to check for
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*
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* @return boolean whether the character is an upper alphabetic one or not
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*/
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public function isUpper($c)
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{
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return $this->_type->isUpper($c);
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}
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/**
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* Checks if a character is a lower alphabetic one
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*
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* @param string $c character to check for
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*
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* @return boolean whether the character is a lower alphabetic one or not
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*/
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public function isLower($c)
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{
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return $this->_type->isLower($c);
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}
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/**
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* Checks if a character is a space one
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*
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* @param string $c character to check for
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*
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* @return boolean whether the character is a space one or not
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*/
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public function isSpace($c)
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{
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return $this->_type->isSpace($c);
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}
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/**
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* Checks if a character is an hexadecimal digit
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*
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* @param string $c character to check for
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*
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* @return boolean whether the character is an hexadecimal digit or not
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*/
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public function isHexDigit($c)
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{
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return $this->_type->isHexDigit($c);
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}
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/**
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* Checks if a number is in a range
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*
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* @param integer $num number to check for
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* @param integer $lower lower bound
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* @param integer $upper upper bound
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*
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* @return boolean whether the number is in the range or not
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*/
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public function numberInRangeInclusive($num, $lower, $upper)
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{
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return $this->_type->numberInRangeInclusive($num, $lower, $upper);
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}
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}
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?>
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