Code Coverage for /home/popy/Documents/popy-calendar/src/Formatter/NumberConverter/Roman.php

1	<?php
2
3	namespace Popy\Calendar\Formatter\NumberConverter;
4
5	use Popy\Calendar\Formatter\NumberConverterInterface;
6
7	/**
8	* Roman units converter.
9	*/
10	class Roman implements NumberConverterInterface
11	{
12	protected static $table = [
13	'M' => 1000,
14	'CM' => 900,
15	'D' => 500,
16	'CD' => 400,
17	'C' => 100,
18	'XC' => 90,
19	'L' => 50,
20	'XL' => 40,
21	'X' => 10,
22	'IX' => 9,
23	'V' => 5,
24	'IV' => 4,
25	'I' => 1,
26	];
27
28	/**
29	* @inheritDoc
30	*/
31	public function to($input)
32	{
33	if ($input === 0) {
34	return '0';
35	}
36
37	if ($input < 0) {
38	return '-' . $this->to(-$input);
39	}
40
41	$res = '';
42
43	foreach (self::$table as $symbol => $value) {
44	while ($input >= $value) {
45	$res .= $symbol;
46	$input -= $value;
47	}
48	}
49
50	return $res;
51	}
52
53	/**
54	* @inheritDoc
55	*/
56	public function from($input)
57	{
58	if ($input === '0') {
59	return 0;
60	}
61
62	$res = $i = 0;
63	$len = strlen($input);
64	$sign = 1;
65
66	if (substr($input, 0, 1) === '-') {
67	$sign = -1;
68	$i = 1;
69	}
70
71	while ($i < $len) {
72	foreach (static::$table as $symbol => $value) {
73	$sl = strlen($symbol);
74
75	if ($symbol === substr($input, $i, $sl)) {
76	$res += $value;
77	$i += $sl;
78
79	continue 2;
80	}
81	}
82
83	// If nothing matched, exit.
84	return null;
85	}
86
87	return $sign * $res;
88	}
89	}