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css_min.utils.class.php

150 lines

1	<?php
2
3	namespace tubalmartin\CssMin;
4
5	class Utils
6	{
7	/**
8	* Clamps a number between a minimum and a maximum value.
9	* @param int\|float $n the number to clamp
10	* @param int\|float $min the lower end number allowed
11	* @param int\|float $max the higher end number allowed
12	* @return int\|float
13	*/
14	public static function clampNumber($n, $min, $max)
15	{
16	return min(max($n, $min), $max);
17	}
18
19	/**
20	* Clamps a RGB color number outside the sRGB color space
21	* @param int\|float $n the number to clamp
22	* @return int\|float
23	*/
24	public static function clampNumberSrgb($n)
25	{
26	return self::clampNumber($n, 0, 255);
27	}
28
29	/**
30	* Converts a HSL color into a RGB color
31	* @param array $hslValues
32	* @return array
33	*/
34	public static function hslToRgb($hslValues)
35	{
36	$h = floatval($hslValues[0]);
37	$s = floatval(str_replace('%', '', $hslValues[1]));
38	$l = floatval(str_replace('%', '', $hslValues[2]));
39
40	// Wrap and clamp, then fraction!
41	$h = ((($h % 360) + 360) % 360) / 360;
42	$s = self::clampNumber($s, 0, 100) / 100;
43	$l = self::clampNumber($l, 0, 100) / 100;
44
45	if ($s == 0) {
46	$r = $g = $b = self::roundNumber(255 * $l);
47	} else {
48	$v2 = $l < 0.5 ? $l * (1 + $s) : ($l + $s) - ($s * $l);
49	$v1 = (2 * $l) - $v2;
50	$r = self::roundNumber(255 * self::hueToRgb($v1, $v2, $h + (1/3)));
51	$g = self::roundNumber(255 * self::hueToRgb($v1, $v2, $h));
52	$b = self::roundNumber(255 * self::hueToRgb($v1, $v2, $h - (1/3)));
53	}
54
55	return array($r, $g, $b);
56	}
57
58	/**
59	* Tests and selects the correct formula for each RGB color channel
60	* @param $v1
61	* @param $v2
62	* @param $vh
63	* @return mixed
64	*/
65	public static function hueToRgb($v1, $v2, $vh)
66	{
67	$vh = $vh < 0 ? $vh + 1 : ($vh > 1 ? $vh - 1 : $vh);
68
69	if ($vh * 6 < 1) {
70	return $v1 + ($v2 - $v1) * 6 * $vh;
71	}
72
73	if ($vh * 2 < 1) {
74	return $v2;
75	}
76
77	if ($vh * 3 < 2) {
78	return $v1 + ($v2 - $v1) * ((2 / 3) - $vh) * 6;
79	}
80
81	return $v1;
82	}
83
84	/**
85	* Convert strings like "64M" or "30" to int values
86	* @param mixed $size
87	* @return int
88	*/
89	public static function normalizeInt($size)
90	{
91	if (is_string($size)) {
92	$letter = substr($size, -1);
93	$size = intval($size);
94	switch ($letter) {
95	case 'M':
96	case 'm':
97	return (int) $size * 1048576;
98	case 'K':
99	case 'k':
100	return (int) $size * 1024;
101	case 'G':
102	case 'g':
103	return (int) $size * 1073741824;
104	}
105	}
106	return (int) $size;
107	}
108
109	/**
110	* Converts a string containing and RGB percentage value into a RGB integer value i.e. '90%' -> 229.5
111	* @param $rgbPercentage
112	* @return int
113	*/
114	public static function rgbPercentageToRgbInteger($rgbPercentage)
115	{
116	if (strpos($rgbPercentage, '%') !== false) {
117	$rgbPercentage = self::roundNumber(floatval(str_replace('%', '', $rgbPercentage)) * 2.55);
118	}
119
120	return intval($rgbPercentage, 10);
121	}
122
123	/**
124	* Converts a RGB color into a HEX color
125	* @param array $rgbColors
126	* @return array
127	*/
128	public static function rgbToHex($rgbColors)
129	{
130	$hexColors = array();
131
132	// Values outside the sRGB color space should be clipped (0-255)
133	for ($i = 0, $l = count($rgbColors); $i < $l; $i++) {
134	$hexColors[$i] = sprintf("%02x", self::clampNumberSrgb(self::rgbPercentageToRgbInteger($rgbColors[$i])));
135	}
136
137	return $hexColors;
138	}
139
140	/**
141	* Rounds a number to its closest integer
142	* @param $n
143	* @return int
144	*/
145	public static function roundNumber($n)
146	{
147	return intval(round(floatval($n)), 10);
148	}
149	}
150