152 lines
4.2 KiB
PHP
152 lines
4.2 KiB
PHP
<?php
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/* $Id$ */
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if(!defined('PMA_STR_LIB_INCLUDED')) {
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define('PMA_STR_LIB_INCLUDED', 1);
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/* Specialized String Functions for phpMyAdmin
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**
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** Copyright 2002 Robin Johnson <robbat2@users.sourceforge.net>
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** http://www.orbis-terrarum.net/?l=people.robbat2
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**
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** Defines a set of function callbacks that have a pure C version
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** available if the ctype extension is available, but otherwise
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** have PHP versions to use (that are slower)
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**
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** The SQL Parser code relies heavily on these functions
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**/
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/**
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* This checks if a string actually exists inside another string
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* We try to do it in a PHP3-portable way
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* We don't care about the position it is in.
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*
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* @param string string to search for
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* @param string string to search in
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*
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* @return boolean if the needle is in the haystack
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*/
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function PMA_STR_StrInStr($needle,$haystack)
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{
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// strpos($haystack,$needle) !== FALSE
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return (is_integer(strpos($haystack,$needle)));
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}
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// checks if a given character position in
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// the string is escaped or not
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function PMA_STR_CharIsEscaped($string,$pos,$start=0)
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{
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$len = strlen($string);
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// Base case
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// Check for string length or invalid input
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// or special case of input
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// (pos == $start)
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if($pos == $start || $len <= $pos) {
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return FALSE;
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}
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$p = $pos-1;
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$escaped = FALSE;
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while(($p >= $start) && ($string[$p] == "\\")) {
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$escaped = !$escaped;
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$p--;
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}
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if($pos < $start) {
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//throw error about strings
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}
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return $escaped;
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}
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function PMA_STR_NumberInRangeInclusive($num,$lower,$upper)
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{
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return ($num >= $lower) && ($num <= $upper);
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}
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function PMA_STR_isdigit($c)
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{
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$ord_zero = 48; //ord('0');
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$ord_nine = 57; //ord('9');
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$ord_c = ord($c);
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return PMA_STR_NumberInRangeInclusive($ord_c,$ord_zero,$ord_nine);
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}
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function PMA_STR_ishexdigit($c)
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{
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$ord_Aupper = 65; //ord('A');
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$ord_Fupper = 70; //ord('F');
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$ord_Alower = 97; //ord('a');
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$ord_Flower = 102; //ord('f');
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$ord_zero = 48; //ord('0');
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$ord_nine = 57; //ord('9');
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$ord_c = ord($c);
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return
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PMA_STR_NumberInRangeInclusive($ord_c,$ord_zero,$ord_nine)
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|| PMA_STR_NumberInRangeInclusive($ord_c,$ord_Aupper,$ord_Fupper)
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|| PMA_STR_NumberInRangeInclusive($ord_c,$ord_Alower,$ord_Flower);
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}
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function PMA_STR_isupper($c)
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{
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$ord_zero = 65; //ord('A');
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$ord_nine = 90; //ord('Z');
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$ord_c = ord($c);
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return PMA_STR_NumberInRangeInclusive($ord_c,$ord_zero,$ord_nine);
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}
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function PMA_STR_islower($c)
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{
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$ord_zero = 97; //ord('a');
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$ord_nine = 122; //ord('z');
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$ord_c = ord($c);
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return PMA_STR_NumberInRangeInclusive($ord_c,$ord_zero,$ord_nine);
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}
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function PMA_STR_isalpha($c)
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{
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return PMA_STR_isupper($c) || PMA_STR_islower($c);
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}
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function PMA_STR_isalnum($c)
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{
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return PMA_STR_isupper($c) || PMA_STR_islower($c) || PMA_STR_isdigit($c);
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}
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function PMA_STR_isspace($c)
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{
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$ord_tab = 9;
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$ord_CR = 13;
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$ord_c = ord($c);
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return ($ord_c == 32) ||
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PMA_STR_NumberInRangeInclusive($ord_c,$ord_tab,$ord_CR);
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}
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function PMA_STR_isSQLidentifier($c,$dotIsValid=FALSE)
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{
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return PMA_STR_isalnum($c) || ($c == '_') || ($c == '$') || (($dotIsValid != FALSE) && ($c == '.'));
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}
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function PMA_STR_BinarySearchInArr($str,$arr,$arrsize)
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{
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//$arr NUST be sorted, due to binary search
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$top = $arrsize-1;
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$bottom = 0;
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$found = FALSE;
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while( ($top >= $bottom) && ($found == FALSE)) {
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$mid = intval(($top+$bottom)/2);
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$res = strcmp($str,$arr[$mid]);
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if($res == 0) {
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$found = TRUE;
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} elseif($res < 0) {
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$top = $mid-1;
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} else {
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$bottom = $mid+1;
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}
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}
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return $found;
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}
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} // $__PMA_STR_LIB__
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?>
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