Help parsing strings / arrays

[JaredKnapp]

I'm stuck figuring out why my check for [space]BT[space] is failing in the code below. I have a really long string, and am running through it one character at a time. Each time I execute a loop iteration, I add the new character to the end of a 15 character array, and drop off the first character. You can see in the results that the [space]BT[sPACE] is running though my array, but my IF statement in _checkToken(...) fails to notice it.

 

Does anyone have any ideas? (where am I being stupid?):

 

var $numberOfCharsToKeep = 15;

 

<<START LOOP THROUGH LONG STRING>>

// Store the recent characters for

// when we have to go back for a checking

echo "Adding Character '".$c."' to ".implode('|',$previousCharacters)."<br>";

for ($j = 0; $j < $this->numberOfCharsToKeep - 1; $j++)

{

$previousCharacters[$j] = $previousCharacters[$j + 1];

}

$previousCharacters[$this->numberOfCharsToKeep - 1] = $c;

echo "NEW Previous Characters=".implode('|',$previousCharacters).'<br>';

// Start of a text object

if (!$inTextObject && $this->_checkToken(array("BT"), $previousCharacters))

{

echo "DEBUG: INTEXT=TRUE<br><br>";

$inTextObject = true;

}

<<END LOOP THROUGH LONG STRING>>

 

 

 

// <summary>

// Check if a certain 2 character token just came along (e.g. BT)

// </summary>

// <param name="tokens">the searched token</param>

// <param name="recent">the recent character array</param>

// <returns></returns>

function _checkToken($tokens, $recent)

{

foreach($tokens as $token)

{

echo "token[0]=".$token[0]." token[1]=".$token[1]."<br>";

echo "recent-4='".$recent[$this->numberOfCharsToKeep - 4]."' recent-3='".$recent[$this->numberOfCharsToKeep - 3]."' recent-2='".$recent[$this->numberOfCharsToKeep - 2]."' recent-1='".$recent[$this->numberOfCharsToKeep - 1]."'<br>";

if (

($recent[$this->numberOfCharsToKeep - 3] == $token[0]) &&

($recent[$this->numberOfCharsToKeep - 2] == $token[1]) &&

(($recent[$this->numberOfCharsToKeep - 1] == ' ') || ($recent[$this->numberOfCharsToKeep - 1] == 0x0d) || ($recent[$this->numberOfCharsToKeep - 1] == 0x0a)) &&

(($recent[$this->numberOfCharsToKeep - 4] == ' ') || ($recent[$this->numberOfCharsToKeep - 4] == 0x0d) || ($recent[$this->numberOfCharsToKeep - 4] == 0x0a))

)

{

echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! RETURNING TRUE<br><br>";

return true;

}

}

return false;

}

 

 

Adding Character ' ' to |/|i|m|g|0| | |D|o| |Q| |B|T

NEW Previous Characters=/|i|m|g|0| | |D|o| |Q| |B|T|

token[0]=B token[1]=T

recent-4=' ' recent-3='B' recent-2='T' recent-1=' '

1Adding Character '1' to /|i|m|g|0| | |D|o| |Q| |B|T|

NEW Previous Characters=i|m|g|0| | |D|o| |Q| |B|T| |1

token[0]=B token[1]=T

recent-4='B' recent-3='T' recent-2=' ' recent-1='1'

Adding Character ' ' to i|m|g|0| | |D|o| |Q| |B|T| |1

NEW Previous Characters=m|g|0| | |D|o| |Q| |B|T| |1|

token[0]=B token[1]=T

recent-4='T' recent-3=' ' recent-2='1' recent-1=' '

0Adding Character '0' to m|g|0| | |D|o| |Q| |B|T| |1|

 

[CroNiX]

Please post your code within code tags.  Its the '#' icon in the editor and start your code with <?php so it will get formatted and colorized properly.

[JaredKnapp]

Sorry, I don't see where to edit my original post, so here it is properly formatted:

 

MEMBER CONSTANT

<?php
         var $numberOfCharsToKeep = 15;

 

START LOOP THROUGH LONG STRING:

<?php
         // Store the recent characters for
         // when we have to go back for a checking
         echo "Adding Character '".$c."' to ".implode('|',$previousCharacters)."<br>";
         for ($j = 0; $j < $this->numberOfCharsToKeep - 1; $j++)
         {
            $previousCharacters[$j] = $previousCharacters[$j + 1];
         }
         $previousCharacters[$this->numberOfCharsToKeep - 1] = $c;
         echo "NEW Previous Characters=".implode('|',$previousCharacters).'<br>';         
         // Start of a text object
         if (!$inTextObject && $this->_checkToken(array("BT"), $previousCharacters))
         {
            echo "DEBUG: INTEXT=TRUE<br><br>";
            $inTextObject = true;
         }

END LOOP THROUGH LONG STRING

 

TOKEN CHECKING:

<?php
   // <summary>
   // Check if a certain 2 character token just came along (e.g. BT)
   // </summary>
   // <param name="tokens">the searched token</param>
   // <param name="recent">the recent character array</param>
   // <returns></returns>
   function _checkToken($tokens, $recent)
   {
      foreach($tokens as $token)
      {
         echo "token[0]=".$token[0]." token[1]=".$token[1]."<br>";
         echo "recent-4='".$recent[$this->numberOfCharsToKeep - 4]."' recent-3='".$recent[$this->numberOfCharsToKeep - 3]."' recent-2='".$recent[$this->numberOfCharsToKeep - 2]."' recent-1='".$recent[$this->numberOfCharsToKeep - 1]."'<br>";
         if (
            ($recent[$this->numberOfCharsToKeep - 3] == $token[0]) &&
            ($recent[$this->numberOfCharsToKeep - 2] == $token[1]) &&
            (($recent[$this->numberOfCharsToKeep - 1] == ' ') || ($recent[$this->numberOfCharsToKeep - 1] == 0x0d) || ($recent[$this->numberOfCharsToKeep - 1] == 0x0a)) &&
            (($recent[$this->numberOfCharsToKeep - 4] == ' ') || ($recent[$this->numberOfCharsToKeep - 4] == 0x0d) || ($recent[$this->numberOfCharsToKeep - 4] == 0x0a))
            )
         {
            echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! RETURNING TRUE<br><br>";
            return true;
         }
      }
      return false;
   }

 

RESULTS:

======================================================

Adding Character ' ' to |/|i|m|g|0| | |D|o| |Q| |B|T

NEW Previous Characters=/|i|m|g|0| | |D|o| |Q| |B|T|

token[0]=B token[1]=T

recent-4=' ' recent-3='B' recent-2='T' recent-1=' '

1Adding Character '1' to /|i|m|g|0| | |D|o| |Q| |B|T|

NEW Previous Characters=i|m|g|0| | |D|o| |Q| |B|T| |1

token[0]=B token[1]=T

recent-4='B' recent-3='T' recent-2=' ' recent-1='1'

Adding Character ' ' to i|m|g|0| | |D|o| |Q| |B|T| |1

NEW Previous Characters=m|g|0| | |D|o| |Q| |B|T| |1|

token[0]=B token[1]=T

recent-4='T' recent-3=' ' recent-2='1' recent-1=' '

0Adding Character '0' to m|g|0| | |D|o| |Q| |B|T| |1|