<?php
function lessfunction_if(&$data, &$prop) {
$if = "if(".implode(", ", $data).")";
if (!isset($data[1])) return $if;
if (!preg_match('/^\s*([^\s]+)\s*(\x3e=?|\x3c=?|==?|!=?)\s*([^\s]+)\s*$/', $data[0], $m)) return $if;
if (!isset($data[2])) $data[2] = "";
$unit = false;
lesshelpfunction_normalizeparam($m[1], $unit, $prop);
lesshelpfunction_normalizeparam($m[3], $unit, $prop);
switch ($m[2]) {
case '>': return ($m[1] > $m[3] ? $data[1] : $data[2]);
case '>=': return ($m[1] >= $m[3] ? $data[1] : $data[2]);
case '<': return ($m[1] < $m[3] ? $data[1] : $data[2]);
case '<=': return ($m[1] <= $m[3] ? $data[1] : $data[2]);
case '=':
case '==': return ($m[1] == $m[3] ? $data[1] : $data[2]);
case '!=': return ($m[1] != $m[3] ? $data[1] : $data[2]);
}
}
function lessfunction_min(&$data, &$prop) {
$unit = lesshelpfunction_normalizeparams($data, $prop);
return lesshelpfunction_returnval(min($data), $unit);
}
function lessfunction_max(&$data, &$prop) {
$unit = lesshelpfunction_normalizeparams($data, $prop);
return lesshelpfunction_returnval(max($data), $unit);
}
function lessfunction_avg(&$data, &$prop) {
$unit = lesshelpfunction_normalizeparams($data, $prop);
return lesshelpfunction_returnval(array_sum($data) / count($data), $unit);
}
function lessfunction_ceil(&$data, &$prop) {
$unit = false;
lesshelpfunction_normalizeparam($data[0], $unit, $prop);
return lesshelpfunction_returnval(ceil($data[0]), $unit);
}
function lessfunction_floor(&$data, &$prop) {
$unit = false;
lesshelpfunction_normalizeparam($data[0], $unit, $prop);
return lesshelpfunction_returnval(floor($data[0]), $unit);
}
function lessfunction_round(&$data, &$prop) {
$unit = false;
lesshelpfunction_normalizeparam($data[0], $unit, $prop);
return lesshelpfunction_returnval(round($data[0], isset($data[1]) ? (double) $data[1] : 0), $unit);
}
function lessfunction_lighten(&$data, &$prop) {
$unit = 'color';
lesshelpfunction_normalizeparam($data[0], $unit, $prop);
$unit = '%';
lesshelpfunction_normalizeparam($data[1], $unit, $prop);
// convert to HSV
$data[0] = lesshelpfunction_rgb2hsv($data[0][0], $data[0][1], $data[0][2]);
// add/subtract to VALUE (between 0 and 100)
$data[0][2] = max(min($data[0][2] + $data[1], 100), 0);
$data[0] = lesshelpfunction_hsv2rgb($data[0][0], $data[0][1], $data[0][2]);
return lesshelpfunction_color2hex($data[0]);
}
function lessfunction_darken(&$data, &$prop) {
$data[1] = '-'.$data[1];
return lessfunction_lighten($data, $prop);
}
function lessfunction_greyscale(&$data, &$prop) {
$unit = 'color';
lesshelpfunction_normalizeparam($data[0], $unit, $prop);
$grey = ($data[0][0] * 0.3) + ($data[0][1] * 0.59) + ($data[0][2] * 0.11);
return lesshelpfunction_color2hex(array($grey, $grey, $grey));
}
function lesshelpfunction_normalizeparams(&$data, &$prop) {
$unit = false;
for ($i = 0; $i < count($data); $i++) {
lesshelpfunction_normalizeparam($data[$i], $unit, $prop);
}
return $unit;
}
function lesshelpfunction_normalizeparam(&$param, &$unit, &$prop) {
if (substr($param, 0, 1) == '#') {
// color
if ($unit !== false && $unit != 'color') {
throw new Exception("Mixing units inside property expressions ('{$unit}' and 'color')");
}
$unit = 'color';
$param = substr($param, 1);
switch (strlen($param)) {
case 6:
$param = array(hexdec(substr($param, 0, 2)), hexdec(substr($param, 2, 2)), hexdec(substr($param, -2)));
return;
case 3:
$param = array(hexdec($param{0}.$param{0}), hexdec($param{1}.$param{1}), hexdec($param{2}.$param{2}));
return;
}
throw new Exception("Invalid color format inside property expression '{$param}'");
} elseif (preg_match('/^rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/', $param, $m)) {
// color rgb(r, g, b)
if ($unit !== false && $unit != 'color') {
throw new Exception("Mixing units inside property expressions ('{$unit}' and 'color')");
}
$param = array($m[1], $m[2], $m[3]);
} elseif (preg_match('/^rgba\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/', $param, $m)) {
// color rgba(r, g, b, a)
if ($unit !== false && $unit != 'color') {
throw new Exception("Mixing units inside property expressions ('{$unit}' and 'color')");
}
$param = array($m[1], $m[2], $m[3], $m[4]);
} elseif (preg_match('/^(\-?[0-9]+|\-?[0-9]*\.[0-9]+)'.$prop->units_expr.'$/', $param, $m)) {
if ($unit !== false && $unit != $m[2]) {
throw new Exception("Calling function with several diferent units ({$unit} and {$m[2]})");
}
$unit = $m[2];
$param = $m[1];
} else {
$param = (double) $param;
}
}
function lesshelpfunction_returnval(&$val, &$unit) {
return $val . ($unit !== false ? $unit : '');
}
function lesshelpfunction_color2hex($c) {
//return 'rgb('.implode(',', $c).')';
return '#'
. str_pad(dechex($c[0]), 2, '0', STR_PAD_LEFT)
. str_pad(dechex($c[1]), 2, '0', STR_PAD_LEFT)
. str_pad(dechex($c[2]), 2, '0', STR_PAD_LEFT);
}
function lesshelpfunction_rgb2hsv($r, $g, $b) {
$r /= 255;
$g /= 255;
$b /= 255;
$M = max($r, $g, $b);
$m = min($r, $g, $b);
$C = $M - $m;
$v = $M;
if ($C == 0) {
$h = 0;
$s = 0;
} else {
if ($M == $r)
$h = ($g - $b) / $C;
elseif ($M == $g)
$h = ($b - $r) / $C + 2;
else
$h = ($r - $g) / $C + 4;
$h *= 60;
$s = $C / $v * 100;
}
$v *= 100;
return array($h, $s, $v);
}
function lesshelpfunction_hsv2rgb($h, $s, $v) {
if ($v == 0) {
return array(0, 0, 0);
}
$v /= 100;
if ($s == 0) {
// grey tones
$v *= 255;
return array($v, $v, $v);
} else {
$s /= 100;
$h /= 60;
$i = floor($h);
$f = $h - $i;
if ($i % 2 == 0) $f = 1 - $f;
$m = $v * (1 - $s);
$n = $v * (1 - $s * $f);
$v *= 255;
$n *= 255;
$m *= 255;
switch ($i) {
case 6:
case 0: return array($v, $n, $m);
case 1: return array($n, $v, $m);
case 2: return array($m, $v, $n);
case 3: return array($m, $n, $v);
case 4: return array($n, $m, $v);
case 5: return array($v, $m, $n);
}
}
}
?>
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