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File: string.lib.php

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File: string.lib.php
Role: Auxiliary script
Content type: text/plain
Description: Needed library (borrowed from phpMyAdmin)
Class: Compare DB
Compare and synchronize two databases
Author: By
Last change:
Date: 17 years ago
Size: 9,123 bytes
 

Contents

Class file image Download
<?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 <robbat2@users.sourceforge.net>
 * 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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