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
|
<?php
/**
* `WHERE` keyword parser.
*/
declare(strict_types=1);
namespace PhpMyAdmin\SqlParser\Components;
use PhpMyAdmin\SqlParser\Component;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;
/**
* `WHERE` keyword parser.
*/
class Condition extends Component
{
/**
* Logical operators that can be used to delimit expressions.
*
* @var array
*/
public static $DELIMITERS = [
'&&',
'||',
'AND',
'OR',
'XOR',
];
/**
* List of allowed reserved keywords in conditions.
*
* @var array
*/
public static $ALLOWED_KEYWORDS = [
'ALL' => 1,
'AND' => 1,
'BETWEEN' => 1,
'EXISTS' => 1,
'IF' => 1,
'IN' => 1,
'INTERVAL' => 1,
'IS' => 1,
'LIKE' => 1,
'MATCH' => 1,
'NOT IN' => 1,
'NOT NULL' => 1,
'NOT' => 1,
'NULL' => 1,
'OR' => 1,
'REGEXP' => 1,
'RLIKE' => 1,
'XOR' => 1,
];
/**
* Identifiers recognized.
*
* @var array
*/
public $identifiers = [];
/**
* Whether this component is an operator.
*
* @var bool
*/
public $isOperator = false;
/**
* The condition.
*
* @var string
*/
public $expr;
/**
* @param string $expr the condition or the operator
*/
public function __construct($expr = null)
{
$this->expr = trim((string) $expr);
}
/**
* @param Parser $parser the parser that serves as context
* @param TokensList $list the list of tokens that are being parsed
* @param array $options parameters for parsing
*
* @return Condition[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = [])
{
$ret = [];
$expr = new static();
/**
* Counts brackets.
*
* @var int
*/
$brackets = 0;
/**
* Whether there was a `BETWEEN` keyword before or not.
*
* It is required to keep track of them because their structure contains
* the keyword `AND`, which is also an operator that delimits
* expressions.
*
* @var bool
*/
$betweenBefore = false;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
*
* @var Token
*/
$token = $list->tokens[$list->idx];
// End of statement.
if ($token->type === Token::TYPE_DELIMITER) {
break;
}
// Skipping whitespaces and comments.
if ($token->type === Token::TYPE_COMMENT) {
continue;
}
// Replacing all whitespaces (new lines, tabs, etc.) with a single
// space character.
if ($token->type === Token::TYPE_WHITESPACE) {
$expr->expr .= ' ';
continue;
}
// Conditions are delimited by logical operators.
if (in_array($token->value, static::$DELIMITERS, true)) {
if ($betweenBefore && ($token->value === 'AND')) {
// The syntax of keyword `BETWEEN` is hard-coded.
$betweenBefore = false;
} else {
// The expression ended.
$expr->expr = trim($expr->expr);
if (! empty($expr->expr)) {
$ret[] = $expr;
}
// Adding the operator.
$expr = new static($token->value);
$expr->isOperator = true;
$ret[] = $expr;
// Preparing to parse another condition.
$expr = new static();
continue;
}
}
if (($token->type === Token::TYPE_KEYWORD)
&& ($token->flags & Token::FLAG_KEYWORD_RESERVED)
&& ! ($token->flags & Token::FLAG_KEYWORD_FUNCTION)
) {
if ($token->value === 'BETWEEN') {
$betweenBefore = true;
}
if (($brackets === 0) && empty(static::$ALLOWED_KEYWORDS[$token->value])) {
break;
}
}
if ($token->type === Token::TYPE_OPERATOR) {
if ($token->value === '(') {
++$brackets;
} elseif ($token->value === ')') {
if ($brackets === 0) {
break;
}
--$brackets;
}
}
$expr->expr .= $token->token;
if (($token->type === Token::TYPE_NONE)
|| (($token->type === Token::TYPE_KEYWORD)
&& (! ($token->flags & Token::FLAG_KEYWORD_RESERVED)))
|| ($token->type === Token::TYPE_STRING)
|| ($token->type === Token::TYPE_SYMBOL)
) {
if (! in_array($token->value, $expr->identifiers)) {
$expr->identifiers[] = $token->value;
}
}
}
// Last iteration was not processed.
$expr->expr = trim($expr->expr);
if (! empty($expr->expr)) {
$ret[] = $expr;
}
--$list->idx;
return $ret;
}
/**
* @param Condition[] $component the component to be built
* @param array $options parameters for building
*
* @return string
*/
public static function build($component, array $options = [])
{
if (is_array($component)) {
return implode(' ', $component);
}
return $component->expr;
}
}
|
