|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace Mattbit\Flat\Query; |
|
4
|
|
|
|
|
5
|
|
|
use Mattbit\Flat\Query\Expression\Factory; |
|
6
|
|
|
use Mattbit\Flat\Query\Expression\Leaf\EqExpression; |
|
7
|
|
|
use Mattbit\Flat\Query\Expression\Tree\AndExpression; |
|
8
|
|
|
use Mattbit\Flat\Query\Expression\Tree\Expression as TreeExpression; |
|
9
|
|
|
|
|
10
|
|
|
class Parser |
|
11
|
|
|
{ |
|
12
|
|
|
protected $factory; |
|
13
|
|
|
|
|
14
|
9 |
|
public function __construct(Factory $factory) |
|
15
|
|
|
{ |
|
16
|
9 |
|
$this->factory = $factory; |
|
17
|
9 |
|
} |
|
18
|
|
|
|
|
19
|
|
|
/** |
|
20
|
|
|
* Parses a query and returns an ExpressionInterface. |
|
21
|
|
|
* That’s the core logic of the database. |
|
22
|
|
|
* |
|
23
|
|
|
* @param $query |
|
24
|
|
|
* |
|
25
|
|
|
* @return ExpressionInterface |
|
26
|
|
|
*/ |
|
27
|
8 |
|
public function parse(array $query) |
|
28
|
|
|
{ |
|
29
|
8 |
|
return $this->parseExpression($query); |
|
30
|
|
|
} |
|
31
|
|
|
|
|
32
|
8 |
|
protected function parseExpression($element, $path = null) |
|
33
|
|
|
{ |
|
34
|
8 |
|
$expressions = []; |
|
35
|
|
|
|
|
36
|
|
|
// If the element is a simple value, we return an EqualityExpression. |
|
37
|
8 |
|
if (!is_array($element)) { |
|
38
|
2 |
|
return new EqExpression($path, $element); |
|
39
|
|
|
} |
|
40
|
|
|
|
|
41
|
|
|
// Otherwise we parse each nested expression. If we find an operator |
|
42
|
|
|
// we parse the expression, otherwise we recursively call |
|
43
|
|
|
// `parseExpression` with the nested path. |
|
44
|
8 |
|
foreach ($element as $key => $value) { |
|
45
|
8 |
|
if ($this->isOperator($key)) { |
|
46
|
6 |
|
$expressions[] = $this->parseOperator($key, $value, $path); |
|
47
|
5 |
|
} else { |
|
48
|
7 |
|
$nextPath = $path ? "{$path}.{$key}" : $key; |
|
49
|
7 |
|
$expressions[] = $this->parseExpression($value, $nextPath); |
|
50
|
|
|
} |
|
51
|
7 |
|
} |
|
52
|
|
|
|
|
53
|
|
|
// If we have one expression, we just return that. If there are |
|
54
|
|
|
// more than one, we should wrap them into a LogicAnd. |
|
55
|
7 |
|
if (count($expressions) === 1) { |
|
56
|
7 |
|
return $expressions[0]; |
|
57
|
|
|
} |
|
58
|
|
|
|
|
59
|
2 |
|
return new AndExpression($expressions); |
|
60
|
|
|
} |
|
61
|
|
|
|
|
62
|
6 |
|
protected function parseOperator($operator, $value, $path) |
|
63
|
|
|
{ |
|
64
|
6 |
|
$expression = $this->factory->make($operator, $path, $value); |
|
65
|
|
|
|
|
66
|
|
|
// If the expression is a TreeExpression we must parse the nested |
|
67
|
|
|
// elements and add them to the expression. |
|
68
|
6 |
|
if ($expression instanceof TreeExpression) { |
|
69
|
3 |
|
return $this->parseTreeExpression($expression, $value, $path); |
|
70
|
|
|
} |
|
71
|
|
|
|
|
72
|
5 |
|
return $expression; |
|
73
|
|
|
} |
|
74
|
|
|
|
|
75
|
3 |
|
protected function parseTreeExpression(TreeExpression $expression, $element, $path) |
|
76
|
|
|
{ |
|
77
|
3 |
|
if (!is_array($element)) { |
|
78
|
1 |
|
$class = get_class($expression); |
|
79
|
1 |
|
throw new \Exception("The `{$class}` element must be an array"); |
|
80
|
|
|
} |
|
81
|
|
|
|
|
82
|
2 |
|
foreach ($element as $value) { |
|
83
|
2 |
|
$expression->add($this->parseExpression($value, $path)); |
|
84
|
2 |
|
} |
|
85
|
|
|
|
|
86
|
2 |
|
return $expression; |
|
87
|
|
|
} |
|
88
|
|
|
|
|
89
|
8 |
|
protected function isOperator($key) |
|
90
|
|
|
{ |
|
91
|
8 |
|
return $key[0] === '$'; |
|
92
|
|
|
} |
|
93
|
|
|
} |
|
94
|
|
|
|
mattbit /
flat
