forked from scssphp/scssphp
-
Notifications
You must be signed in to change notification settings - Fork 0
/
CalculationExpression.php
235 lines (200 loc) · 5.71 KB
/
CalculationExpression.php
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
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
<?php
/**
* SCSSPHP
*
* @copyright 2012-2020 Leaf Corcoran
*
* @license http://opensource.org/licenses/MIT MIT
*
* @link http://scssphp.github.io/scssphp
*/
namespace ScssPhp\ScssPhp\Ast\Sass\Expression;
use ScssPhp\ScssPhp\Ast\Sass\Expression;
use ScssPhp\ScssPhp\SourceSpan\FileSpan;
use ScssPhp\ScssPhp\Visitor\ExpressionVisitor;
/**
* A calculation literal.
*
* @internal
*/
final class CalculationExpression implements Expression
{
/**
* This calculation's name.
*
* @var string
* @readonly
*/
private $name;
/**
* The arguments for the calculation.
*
* @var list<Expression>
* @readonly
*/
private $arguments;
/**
* @var FileSpan
* @readonly
*/
private $span;
/**
* Returns a `calc()` calculation expression.
*
* @param Expression $argument
* @param FileSpan $span
*
* @return CalculationExpression
*/
public static function calc(Expression $argument, FileSpan $span): CalculationExpression
{
return new CalculationExpression('calc', [$argument], $span);
}
/**
* Returns a `min()` calculation expression.
*
* @param list<Expression> $arguments
* @param FileSpan $span
*
* @return CalculationExpression
*/
public static function min(array $arguments, FileSpan $span): CalculationExpression
{
if (!$arguments) {
throw new \InvalidArgumentException('min() requires at least one argument.');
}
return new CalculationExpression('min', $arguments, $span);
}
/**
* Returns a `max()` calculation expression.
*
* @param list<Expression> $arguments
* @param FileSpan $span
*
* @return CalculationExpression
*/
public static function max(array $arguments, FileSpan $span): CalculationExpression
{
if (!$arguments) {
throw new \InvalidArgumentException('max() requires at least one argument.');
}
return new CalculationExpression('max', $arguments, $span);
}
/**
* Returns a `clamp()` calculation expression.
*
* @param Expression $min
* @param Expression $value
* @param Expression $max
* @param FileSpan $span
*
* @return CalculationExpression
*/
public static function clamp(Expression $min, Expression $value, Expression $max, FileSpan $span): CalculationExpression
{
return new CalculationExpression('clamp', [$min, $value, $max], $span);
}
/**
* Returns a calculation expression with the given name and arguments.
*
* Unlike the other constructors, this doesn't verify that the arguments are
* valid for the name.
*
* @param string $name
* @param list<Expression> $arguments
* @param FileSpan $span
*/
public function __construct(string $name, array $arguments, FileSpan $span)
{
self::verifyArguments($arguments);
$this->name = $name;
$this->arguments = $arguments;
$this->span = $span;
}
/**
* @return string
*/
public function getName(): string
{
return $this->name;
}
/**
* @return list<Expression>
*/
public function getArguments(): array
{
return $this->arguments;
}
public function getSpan(): FileSpan
{
return $this->span;
}
public function accept(ExpressionVisitor $visitor)
{
return $visitor->visitCalculationExpression($this);
}
/**
* @param list<Expression> $arguments
*
* @throws \InvalidArgumentException if $arguments aren't valid calculation arguments.
*/
private static function verifyArguments(array $arguments): void
{
foreach ($arguments as $argument) {
self::verify($argument);
}
}
/**
* @throws \InvalidArgumentException if $expression isn't a valid calculation argument.
*/
private static function verify(Expression $expression): void
{
if ($expression instanceof NumberExpression) {
return;
}
if ($expression instanceof CalculationExpression) {
return;
}
if ($expression instanceof VariableExpression) {
return;
}
if ($expression instanceof FunctionExpression) {
return;
}
if ($expression instanceof IfExpression) {
return;
}
if ($expression instanceof StringExpression) {
if ($expression->hasQuotes()) {
throw new \InvalidArgumentException('Invalid calculation argument.');
}
return;
}
if ($expression instanceof ParenthesizedExpression) {
self::verify($expression->getExpression());
return;
}
if ($expression instanceof BinaryOperationExpression) {
self::verify($expression->getLeft());
self::verify($expression->getRight());
if ($expression->getOperator() === BinaryOperator::PLUS) {
return;
}
if ($expression->getOperator() === BinaryOperator::MINUS) {
return;
}
if ($expression->getOperator() === BinaryOperator::TIMES) {
return;
}
if ($expression->getOperator() === BinaryOperator::DIVIDED_BY) {
return;
}
throw new \InvalidArgumentException('Invalid calculation argument.');
}
throw new \InvalidArgumentException('Invalid calculation argument.');
}
public function __toString(): string
{
return $this->name . '(' . implode(', ', $this->arguments) . ')';
}
}