1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
<?php
/**
* @private
*/
class Less_Tree_Condition extends Less_Tree {
public $op;
public $lvalue;
public $rvalue;
public $index;
public $negate;
public function __construct( $op, $l, $r, $i = 0, $negate = false ) {
$this->op = trim( $op );
$this->lvalue = $l;
$this->rvalue = $r;
$this->index = $i;
$this->negate = $negate;
}
public function accept( $visitor ) {
$this->lvalue = $visitor->visitObj( $this->lvalue );
$this->rvalue = $visitor->visitObj( $this->rvalue );
}
/**
* @param Less_Environment $env
* @return bool
* @see less-2.5.3.js#Condition.prototype.eval
*/
public function compile( $env ) {
$a = $this->lvalue->compile( $env );
$b = $this->rvalue->compile( $env );
switch ( $this->op ) {
case 'and':
$result = $a && $b;
break;
case 'or':
$result = $a || $b;
break;
default:
$res = Less_Tree::nodeCompare( $a, $b );
// In JS, switch(undefined) with -1,0,-1,defaults goes to `default`.
// In PHP, switch(null) would go to case 0. Use if/else instead.
if ( $res === -1 ) {
$result = $this->op === '<' || $this->op === '=<' || $this->op === '<=';
} elseif ( $res === 0 ) {
$result = $this->op === '=' || $this->op === '>=' || $this->op === '=<' || $this->op === '<=';
} elseif ( $res === 1 ) {
$result = $this->op === '>' || $this->op === '>=';
} else {
// null, NAN
$result = false;
}
}
return $this->negate ? !$result : $result;
}
}
|
