<?php
/**
* @author Gasper Kozak
* @copyright 2007-2011
This file is part of WideImage.
WideImage is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
WideImage is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with WideImage; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* @package Internals
**/
/**
* @package Exceptions
*/
class WideImage_InvalidCoordinateException extends WideImage_Exception
{
}
/**
* A utility class for smart coordinates
*
* @package Internals
**/
class WideImage_Coordinate
{
protected static $coord_align = array("left", "center", "right", "top", "middle", "bottom");
protected static $coord_numeric = array("[0-9]+", "[0-9]+\.[0-9]+", "[0-9]+%", "[0-9]+\.[0-9]+%");
/**
* Parses a numeric or string representation of a corrdinate into a structure
*
* @param string $coord Smart coordinate
* @return array Parsed smart coordinate
*/
public static function parse($c)
{
$tokens = array();
$operators = array('+', '-');
$flush_operand = false;
$flush_operator = false;
$current_operand = '';
$current_operator = '';
$coordinate = strval($c);
$expr_len = strlen($coordinate);
for ($i = 0; $i < $expr_len; $i++) {
$char = $coordinate[$i];
if (in_array($char, $operators)) {
$flush_operand = true;
$flush_operator = true;
$current_operator = $char;
} else {
$current_operand .= $char;
if ($i == $expr_len - 1) {
$flush_operand = true;
}
}
if ($flush_operand) {
if (trim($current_operand) != '') {
$tokens[] = array('type' => 'operand', 'value' => trim($current_operand));
}
$current_operand = '';
$flush_operand = false;
}
if ($flush_operator) {
$tokens[] = array('type' => 'operator', 'value' => $char);
$flush_operator = false;
}
}
return $tokens;
}
/**
* Evaluates the $coord relatively to $dim
*
* @param string $coord A numeric value or percent string
* @param int $dim Dimension
* @param int $sec_dim Secondary dimension (for align)
* @return int Calculated value
*/
public static function evaluate($coord, $dim, $sec_dim = null)
{
$comp_regex = implode('|', self::$coord_align) . '|' . implode('|', self::$coord_numeric);
if (preg_match("/^([+-])?({$comp_regex})$/", $coord, $matches)) {
$sign = intval($matches[1] . "1");
$val = $matches[2];
if (in_array($val, self::$coord_align)) {
if ($sec_dim === null) {
switch ($val) {
case 'left':
case 'top':
return 0;
break;
case 'center':
case 'middle':
return $sign * intval($dim / 2);
break;
case 'right':
case 'bottom':
return $sign * $dim;
break;
default:
return null;
}
} else {
switch ($val) {
case 'left':
case 'top':
return 0;
break;
case 'center':
case 'middle':
return $sign * intval($dim / 2 - $sec_dim / 2);
break;
case 'right':
case 'bottom':
return $sign * ($dim - $sec_dim);
break;
default:
return null;
}
}
} elseif (substr($val, -1) === '%') {
return intval(round($sign * $dim * floatval(str_replace('%', '', $val)) / 100));
} else {
return $sign * intval(round($val));
}
}
}
/**
* Calculates and fixes a smart coordinate into a numeric value
*
* @param mixed $value Smart coordinate, relative to $dim
* @param int $dim Coordinate to which $value is relative
* @param int $sec_dim Secondary dimension (for align)
* @return int Calculated value
*/
public static function fix($value, $dim, $sec_dim = null)
{
$coord_tokens = self::parse($value);
if (count($coord_tokens) == 0 || $coord_tokens[count($coord_tokens) - 1]['type'] != 'operand') {
throw new WideImage_InvalidCoordinateException("Couldn't parse coordinate '$value' properly.");
}
$value = 0;
$operation = 1;
foreach ($coord_tokens as $token) {
if ($token['type'] == 'operand') {
$operand_value = self::evaluate($token['value'], $dim, $sec_dim);
if ($operation == 1) {
$value = $value + $operand_value;
} elseif ($operation == -1) {
$value = $value - $operand_value;
} else {
throw new WideImage_InvalidCoordinateException("Invalid coordinate syntax.");
}
$operation = 0;
} elseif ($token['type'] == 'operator') {
if ($token['value'] == '-') {
if ($operation == 0) {
$operation = -1;
} else {
$operation = $operation * -1;
}
} elseif ($token['value'] == '+') {
if ($operation == 0) {
$operation = '1';
}
}
}
}
return $value;
}
}
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