/
SetOperation.php
158 lines (135 loc) · 4.12 KB
/
SetOperation.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
<?php
declare(strict_types=1);
namespace PhpMyAdmin\SqlParser\Components;
use PhpMyAdmin\SqlParser\Component;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;
use function implode;
use function is_array;
use function trim;
/**
* `SET` keyword parser.
*/
final class SetOperation implements Component
{
/**
* The name of the column that is being updated.
*
* @var string
*/
public $column;
/**
* The new value.
*
* @var string
*/
public $value;
/**
* @param string $column Field's name..
* @param string $value new value
*/
public function __construct($column = '', $value = '')
{
$this->column = $column;
$this->value = $value;
}
/**
* @param Parser $parser the parser that serves as context
* @param TokensList $list the list of tokens that are being parsed
* @param array<string, mixed> $options parameters for parsing
*
* @return SetOperation[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = []): array
{
$ret = [];
$expr = new static();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ---------------------[ col_name ]--------------------> 0
* 0 ------------------------[ = ]------------------------> 1
* 1 -----------------------[ value ]---------------------> 1
* 1 ------------------------[ , ]------------------------> 0
*
* @var int
*/
$state = 0;
/**
* Token when the parser has seen the latest comma
*
* @var Token
*/
$commaLastSeenAt = null;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
*/
$token = $list->tokens[$list->idx];
// End of statement.
if ($token->type === Token::TYPE_DELIMITER) {
break;
}
// Skipping whitespaces and comments.
if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) {
continue;
}
// No keyword is expected.
if (
($token->type === Token::TYPE_KEYWORD)
&& ($token->flags & Token::FLAG_KEYWORD_RESERVED)
&& ($state === 0)
) {
break;
}
if ($state === 0) {
if ($token->token === '=') {
$state = 1;
} elseif ($token->value !== ',') {
$expr->column .= $token->token;
} elseif ($token->value === ',') {
$commaLastSeenAt = $token;
}
} elseif ($state === 1) {
$tmp = Expression::parse(
$parser,
$list,
['breakOnAlias' => true]
);
if ($tmp === null) {
$parser->error('Missing expression.', $token);
break;
}
$expr->column = trim($expr->column);
$expr->value = $tmp->expr;
$ret[] = $expr;
$expr = new static();
$state = 0;
$commaLastSeenAt = null;
}
}
--$list->idx;
// We saw a comma, but didn't see a column-value pair after it
if ($commaLastSeenAt !== null) {
$parser->error('Unexpected token.', $commaLastSeenAt);
}
return $ret;
}
/**
* @param SetOperation|SetOperation[] $component the component to be built
*/
public static function build($component): string
{
if (is_array($component)) {
return implode(', ', $component);
}
return $component->column . ' = ' . $component->value;
}
public function __toString(): string
{
return static::build($this);
}
}