<?php
/* $Id: string.lib.php,v 1.1 2004/08/07 14:40:01 miguel Exp $ */
// vim: expandtab sw=4 ts=4 sts=4:
/** Specialized String Functions for phpMyAdmin
*
* Copyright 2002 Robin Johnson <[email protected]>
* http://www.orbis-terrarum.net/?l=people.robbat2
*
* Defines a set of function callbacks that have a pure C version available if
* the "ctype" extension is available, but otherwise have PHP versions to use
* (that are slower).
*
* The SQL Parser code relies heavily on these functions.
*/
// This is for handling input better
if (defined('PMA_MULTIBYTE_ENCODING')) {
$GLOBALS['PMA_strlen'] = 'mb_strlen';
$GLOBALS['PMA_strpos'] = 'mb_strpos';
$GLOBALS['PMA_strrpos'] = 'mb_strrpos';
$GLOBALS['PMA_substr'] = 'mb_substr';
} else {
$GLOBALS['PMA_strlen'] = 'strlen';
$GLOBALS['PMA_strpos'] = 'strpos';
$GLOBALS['PMA_strrpos'] = 'strrpos';
$GLOBALS['PMA_substr'] = 'substr';
}
/**
* This checks if a string actually exists inside another string
* We try to do it in a PHP3-portable way.
* We don't care about the position it is in.
*
* @param string string to search for
* @param string string to search in
*
* @return boolean whether the needle is in the haystack or not
*/
function PMA_STR_strInStr($needle, $haystack)
{
// $GLOBALS['PMA_strpos']($haystack, $needle) !== FALSE
// return (is_integer($GLOBALS['PMA_strpos']($haystack, $needle)));
return $GLOBALS['PMA_strpos'](' ' . $haystack, $needle);
} // end of the "PMA_STR_strInStr()" function
/**
* Checks if a given character position in the string is escaped or not
*
* @param string string to check for
* @param integer the character to check for
* @param integer starting position in the string
*
* @return boolean whether the character is escaped or not
*/
function PMA_STR_charIsEscaped($string, $pos, $start = 0)
{
$len = $GLOBALS['PMA_strlen']($string);
// Base case:
// Check for string length or invalid input or special case of input
// (pos == $start)
if (($pos == $start) || ($len <= $pos)) {
return FALSE;
}
$p = $pos - 1;
$escaped = FALSE;
while (($p >= $start) && ($string[$p] == '\\')) {
$escaped = !$escaped;
$p--;
} // end while
if ($pos < $start) {
// throw error about strings
}
return $escaped;
} // end of the "PMA_STR_charIsEscaped()" function
/**
* Checks if a number is in a range
*
* @param integer number to check for
* @param integer lower bound
* @param integer upper bound
*
* @return boolean whether the number is in the range or not
*/
function PMA_STR_numberInRangeInclusive($num, $lower, $upper)
{
return (($num >= $lower) && ($num <= $upper));
} // end of the "PMA_STR_numberInRangeInclusive()" function
/**
* Checks if a character is a digit
*
* @param string character to check for
*
* @return boolean whether the character is a digit or not
*
* @see PMA_STR_numberInRangeInclusive()
*/
function PMA_STR_isDigit($c)
{
$ord_zero = 48; //ord('0');
$ord_nine = 57; //ord('9');
$ord_c = ord($c);
return PMA_STR_numberInRangeInclusive($ord_c, $ord_zero, $ord_nine);
} // end of the "PMA_STR_isDigit()" function
/**
* Checks if a character is an hexadecimal digit
*
* @param string character to check for
*
* @return boolean whether the character is an hexadecimal digit or not
*
* @see PMA_STR_numberInRangeInclusive()
*/
function PMA_STR_isHexDigit($c)
{
$ord_Aupper = 65; //ord('A');
$ord_Fupper = 70; //ord('F');
$ord_Alower = 97; //ord('a');
$ord_Flower = 102; //ord('f');
$ord_zero = 48; //ord('0');
$ord_nine = 57; //ord('9');
$ord_c = ord($c);
return (PMA_STR_numberInRangeInclusive($ord_c, $ord_zero, $ord_nine)
|| PMA_STR_numberInRangeInclusive($ord_c, $ord_Aupper, $ord_Fupper)
|| PMA_STR_numberInRangeInclusive($ord_c, $ord_Alower, $ord_Flower));
} // end of the "PMA_STR_isHexDigit()" function
/**
* Checks if a character is an upper alphabetic one
*
* @param string character to check for
*
* @return boolean whether the character is an upper alphabetic one or
* not
*
* @see PMA_STR_numberInRangeInclusive()
*/
function PMA_STR_isUpper($c)
{
$ord_zero = 65; //ord('A');
$ord_nine = 90; //ord('Z');
$ord_c = ord($c);
return PMA_STR_numberInRangeInclusive($ord_c, $ord_zero, $ord_nine);
} // end of the "PMA_STR_isUpper()" function
/**
* Checks if a character is a lower alphabetic one
*
* @param string character to check for
*
* @return boolean whether the character is a lower alphabetic one or
* not
*
* @see PMA_STR_numberInRangeInclusive()
*/
function PMA_STR_isLower($c)
{
$ord_zero = 97; //ord('a');
$ord_nine = 122; //ord('z');
$ord_c = ord($c);
return PMA_STR_numberInRangeInclusive($ord_c, $ord_zero, $ord_nine);
} // end of the "PMA_STR_isLower()" function
/**
* Checks if a character is an alphabetic one
*
* @param string character to check for
*
* @return boolean whether the character is an alphabetic one or not
*
* @see PMA_STR_isUpper()
* @see PMA_STR_isLower()
*/
function PMA_STR_isAlpha($c)
{
return (PMA_STR_isUpper($c) || PMA_STR_isLower($c));
} // end of the "PMA_STR_isAlpha()" function
/**
* Checks if a character is an alphanumeric one
*
* @param string character to check for
*
* @return boolean whether the character is an alphanumeric one or not
*
* @see PMA_STR_isUpper()
* @see PMA_STR_isLower()
* @see PMA_STR_isDigit()
*/
function PMA_STR_isAlnum($c)
{
return (PMA_STR_isUpper($c) || PMA_STR_isLower($c) || PMA_STR_isDigit($c));
} // end of the "PMA_STR_isAlnum()" function
/**
* Checks if a character is a space one
*
* @param string character to check for
*
* @return boolean whether the character is a space one or not
*
* @see PMA_STR_numberInRangeInclusive()
*/
function PMA_STR_isSpace($c)
{
$ord_space = 32; //ord(' ')
$ord_tab = 9; //ord('\t')
$ord_CR = 13; //ord('\n')
$ord_NOBR = 160; //ord('U+00A0);
$ord_c = ord($c);
return (($ord_c == $ord_space)
|| ($ord_c == $ord_NOBR)
|| PMA_STR_numberInRangeInclusive($ord_c, $ord_tab, $ord_CR));
} // end of the "PMA_STR_isSpace()" function
/**
* Checks if a character is an accented character
*
* @note Presently this only works for some character sets. More work
* may be needed to fix it.
*
* @param string character to check for
*
* @return boolean whether the character is an upper alphabetic one or
* not
*
* @see PMA_STR_numberInRangeInclusive()
*/
function PMA_STR_isAccented($c)
{
$ord_min1 = 192; //ord('A');
$ord_max1 = 214; //ord('Z');
$ord_min2 = 216; //ord('A');
$ord_max2 = 246; //ord('Z');
$ord_min3 = 248; //ord('A');
$ord_max3 = 255; //ord('Z');
$ord_c = ord($c);
return PMA_STR_numberInRangeInclusive($ord_c, $ord_min1, $ord_max1)
|| PMA_STR_numberInRangeInclusive($ord_c, $ord_min2, $ord_max2)
|| PMA_STR_numberInRangeInclusive($ord_c, $ord_min2, $ord_max2);
} // end of the "PMA_STR_isAccented()" function
/**
* Checks if a character is an SQL identifier
*
* @param string character to check for
* @param boolean whether the dot character is valid or not
*
* @return boolean whether the character is an SQL identifier or not
*
* @see PMA_STR_isAlnum()
*/
function PMA_STR_isSqlIdentifier($c, $dot_is_valid = FALSE)
{
return (PMA_STR_isAlnum($c)
|| PMA_STR_isAccented($c)
|| ($c == '_') || ($c == '$')
|| (($dot_is_valid != FALSE) && ($c == '.')));
} // end of the "PMA_STR_isSqlIdentifier()" function
/**
* Binary search of a value in a sorted array
*
* @param string string to search for
* @param array sorted array to search into
* @param integer size of sorted array to search into
*
* @return boolean whether the string has been found or not
*/
function PMA_STR_binarySearchInArr($str, $arr, $arrsize)
{
// $arr NUST be sorted, due to binary search
$top = $arrsize - 1;
$bottom = 0;
$found = FALSE;
while (($top >= $bottom) && ($found == FALSE)) {
$mid = intval(($top + $bottom) / 2);
$res = strcmp($str, $arr[$mid]);
if ($res == 0) {
$found = TRUE;
} else if ($res < 0) {
$top = $mid - 1;
} else {
$bottom = $mid + 1;
}
} // end while
return $found;
} // end of the "PMA_STR_binarySearchInArr()" function
?>
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