|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace Robo\Task\Assets; |
|
4
|
|
|
|
|
5
|
|
|
use Robo\Result; |
|
6
|
|
|
|
|
7
|
|
|
/** |
|
8
|
|
|
* Compiles less files. |
|
9
|
|
|
* |
|
10
|
|
|
* ```php |
|
11
|
|
|
* <?php |
|
12
|
|
|
* $this->taskLess([ |
|
13
|
|
|
* 'less/default.less' => 'css/default.css' |
|
14
|
|
|
* ]) |
|
15
|
|
|
* ->run(); |
|
16
|
|
|
* ?> |
|
17
|
|
|
* ``` |
|
18
|
|
|
* |
|
19
|
|
|
* Use one of both less compilers in your project: |
|
20
|
|
|
* |
|
21
|
|
|
* ``` |
|
22
|
|
|
* "leafo/lessphp": "~0.5", |
|
23
|
|
|
* "oyejorge/less.php": "~1.5" |
|
24
|
|
|
* ``` |
|
25
|
|
|
* |
|
26
|
|
|
* Specify directory (string or array) for less imports lookup: |
|
27
|
|
|
* |
|
28
|
|
|
* ```php |
|
29
|
|
|
* <?php |
|
30
|
|
|
* $this->taskLess([ |
|
31
|
|
|
* 'less/default.less' => 'css/default.css' |
|
32
|
|
|
* ]) |
|
33
|
|
|
* ->importDir('less') |
|
34
|
|
|
* ->compiler('lessphp') |
|
35
|
|
|
* ->run(); |
|
36
|
|
|
* ?> |
|
37
|
|
|
* ``` |
|
38
|
|
|
* |
|
39
|
|
|
* You can implement additional compilers by extending this task and adding a |
|
40
|
|
|
* method named after them and overloading the lessCompilers() method to |
|
41
|
|
|
* inject the name there. |
|
42
|
|
|
*/ |
|
43
|
|
|
class Less extends CssPreprocessor |
|
44
|
|
|
{ |
|
45
|
|
|
const FORMAT_NAME = 'less'; |
|
46
|
|
|
|
|
47
|
|
|
/** |
|
48
|
|
|
* @var string[] |
|
49
|
|
|
*/ |
|
50
|
|
|
protected $compilers = [ |
|
51
|
|
|
'less', // https://github.com/oyejorge/less.php |
|
52
|
|
|
'lessphp', //https://github.com/leafo/lessphp |
|
53
|
|
|
]; |
|
54
|
|
|
|
|
55
|
|
|
/** |
|
56
|
|
|
* lessphp compiler |
|
57
|
|
|
* @link https://github.com/leafo/lessphp |
|
58
|
|
|
* |
|
59
|
|
|
* @param string $file |
|
60
|
|
|
* |
|
61
|
|
|
* @return string |
|
62
|
|
|
*/ |
|
63
|
|
|
protected function lessphp($file) |
|
64
|
|
|
{ |
|
65
|
|
|
if (!class_exists('\lessc')) { |
|
66
|
|
|
return Result::errorMissingPackage($this, 'lessc', 'leafo/lessphp'); |
|
|
|
|
|
|
67
|
|
|
} |
|
68
|
|
|
|
|
69
|
|
|
$lessCode = file_get_contents($file); |
|
70
|
|
|
|
|
71
|
|
|
$less = new \lessc(); |
|
72
|
|
|
if (isset($this->compilerOptions['importDirs'])) { |
|
73
|
|
|
$less->setImportDir($this->compilerOptions['importDirs']); |
|
74
|
|
|
} |
|
75
|
|
|
|
|
76
|
|
|
return $less->compile($lessCode); |
|
77
|
|
|
} |
|
78
|
|
|
|
|
79
|
|
|
/** |
|
80
|
|
|
* less compiler |
|
81
|
|
|
* @link https://github.com/oyejorge/less.php |
|
82
|
|
|
* |
|
83
|
|
|
* @param string $file |
|
84
|
|
|
* |
|
85
|
|
|
* @return string |
|
86
|
|
|
*/ |
|
87
|
|
|
protected function less($file) |
|
88
|
|
|
{ |
|
89
|
|
|
if (!class_exists('\Less_Parser')) { |
|
90
|
|
|
return Result::errorMissingPackage($this, 'Less_Parser', 'oyejorge/less.php'); |
|
|
|
|
|
|
91
|
|
|
} |
|
92
|
|
|
|
|
93
|
|
|
$lessCode = file_get_contents($file); |
|
94
|
|
|
|
|
95
|
|
|
$parser = new \Less_Parser(); |
|
96
|
|
|
$parser->SetOptions($this->compilerOptions); |
|
97
|
|
|
if (isset($this->compilerOptions['importDirs'])) { |
|
98
|
|
|
$importDirs = []; |
|
99
|
|
|
foreach ($this->compilerOptions['importDirs'] as $dir) { |
|
100
|
|
|
$importDirs[$dir] = $dir; |
|
101
|
|
|
} |
|
102
|
|
|
$parser->SetImportDirs($importDirs); |
|
103
|
|
|
} |
|
104
|
|
|
|
|
105
|
|
|
$parser->parse($lessCode); |
|
106
|
|
|
|
|
107
|
|
|
return $parser->getCss(); |
|
108
|
|
|
} |
|
109
|
|
|
} |
|
110
|
|
|
|
If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.