|
1
|
|
|
<?php |
|
2
|
|
|
namespace SimpleMath; |
|
3
|
|
|
|
|
4
|
|
|
abstract class TerminalExpression { |
|
5
|
|
|
|
|
6
|
|
|
protected $value = ''; |
|
7
|
|
|
protected $precidence = 0; |
|
8
|
|
|
protected $leftAssoc = true; |
|
9
|
|
|
|
|
10
|
|
|
public function __construct($value) { |
|
11
|
|
|
$this->value = $value; |
|
12
|
|
|
} |
|
13
|
|
|
|
|
14
|
|
|
public function getPrecidence() { |
|
15
|
|
|
return $this->precidence; |
|
16
|
|
|
} |
|
17
|
|
|
|
|
18
|
|
|
public function isLeftAssoc() { |
|
19
|
|
|
return $this->leftAssoc; |
|
20
|
|
|
} |
|
21
|
|
|
|
|
22
|
|
|
public function isOpen() { |
|
23
|
|
|
return false; |
|
24
|
|
|
} |
|
25
|
|
|
|
|
26
|
|
|
public static function factory($value) { |
|
27
|
|
|
if (is_object($value) && $value instanceof TerminalExpression) { |
|
28
|
|
|
return $value; |
|
29
|
|
|
} elseif (is_numeric($value)) { |
|
30
|
|
|
return new Number($value); |
|
31
|
|
|
} elseif (preg_match('/^\$?[a-z]+$/', $value)) { |
|
32
|
|
|
return new Variable($value); |
|
33
|
|
|
} |
|
34
|
|
|
|
|
35
|
|
|
switch ($value) { |
|
36
|
|
|
case '+': |
|
37
|
|
|
return new Addition($value); |
|
38
|
|
|
case '-': |
|
39
|
|
|
return new Subtraction($value); |
|
40
|
|
|
case '*': |
|
41
|
|
|
return new Multiplication($value); |
|
42
|
|
|
case '/': |
|
43
|
|
|
return new Division($value); |
|
44
|
|
|
case '%': |
|
45
|
|
|
return new Modulo($value); |
|
46
|
|
|
case '?': |
|
47
|
|
|
case ':': |
|
48
|
|
|
return new Ternary($value); |
|
49
|
|
|
case '(': |
|
50
|
|
|
case ')': |
|
51
|
|
|
return new Parenthesis($value); |
|
52
|
|
|
case '==': |
|
53
|
|
|
return new ComparisonEQ($value); |
|
54
|
|
|
case '<': |
|
55
|
|
|
return new ComparisonLT($value); |
|
56
|
|
|
case '>': |
|
57
|
|
|
return new ComparisonGT($value); |
|
58
|
|
|
case '<=': |
|
59
|
|
|
return new ComparisonLTE($value); |
|
60
|
|
|
case '>=': |
|
61
|
|
|
return new ComparisonGTE($value); |
|
62
|
|
|
case '!=': |
|
63
|
|
|
return new ComparisonNE($value); |
|
64
|
|
|
case '||': |
|
65
|
|
|
return new OperatorOr($value); |
|
66
|
|
|
case '&&': |
|
67
|
|
|
return new OperatorAnd($value); |
|
68
|
|
|
} |
|
69
|
|
|
|
|
70
|
|
|
throw new \Exception('Undefined Value ' . $value); |
|
71
|
|
|
} |
|
72
|
|
|
|
|
73
|
|
|
abstract public function operate(Stack $stack, $variables=array()); |
|
74
|
|
|
|
|
75
|
|
|
public function isOperator() { |
|
76
|
|
|
return false; |
|
77
|
|
|
} |
|
78
|
|
|
|
|
79
|
|
|
public function isParenthesis() { |
|
80
|
|
|
return false; |
|
81
|
|
|
} |
|
82
|
|
|
|
|
83
|
|
|
public function render() { |
|
84
|
|
|
return $this->value; |
|
85
|
|
|
} |
|
86
|
|
|
} |
|
87
|
|
|
|
phpmyadmin /
simple-math
