|
1
|
|
|
<?php |
|
2
|
|
|
namespace Xiag\Rql\Parser; |
|
3
|
|
|
|
|
4
|
|
|
use Xiag\Rql\Parser\Exception\SyntaxErrorException; |
|
5
|
|
|
|
|
6
|
|
|
class TokenStream implements \Countable |
|
7
|
|
|
{ |
|
8
|
|
|
/** |
|
9
|
|
|
* @var Token[] |
|
10
|
|
|
*/ |
|
11
|
|
|
protected $tokens; |
|
12
|
|
|
/** |
|
13
|
|
|
* @var int Current position |
|
14
|
|
|
*/ |
|
15
|
|
|
protected $current; |
|
16
|
|
|
|
|
17
|
|
|
/** |
|
18
|
|
|
* @param array $tokens An array of tokens |
|
19
|
|
|
*/ |
|
20
|
81 |
|
public function __construct(array $tokens) |
|
21
|
|
|
{ |
|
22
|
81 |
|
$this->tokens = $tokens; |
|
23
|
81 |
|
$this->current = 0; |
|
24
|
81 |
|
} |
|
25
|
|
|
|
|
26
|
|
|
/** |
|
27
|
|
|
* @inheritdoc |
|
28
|
|
|
*/ |
|
29
|
17 |
|
public function count() |
|
30
|
|
|
{ |
|
31
|
17 |
|
return count($this->tokens); |
|
32
|
|
|
} |
|
33
|
|
|
|
|
34
|
|
|
/** |
|
35
|
|
|
* @return Token |
|
36
|
|
|
* @throws SyntaxErrorException If the stream ends |
|
37
|
|
|
*/ |
|
38
|
80 |
|
public function next() |
|
39
|
|
|
{ |
|
40
|
80 |
|
if (!isset($this->tokens[++$this->current])) { |
|
41
|
|
|
throw new SyntaxErrorException('Unexpected end of stream'); |
|
42
|
|
|
} |
|
43
|
|
|
|
|
44
|
80 |
|
return $this->tokens[$this->current - 1]; |
|
45
|
|
|
} |
|
46
|
|
|
|
|
47
|
|
|
/** |
|
48
|
|
|
* @param int|int[] $type |
|
49
|
|
|
* @param string|string[] $value |
|
50
|
|
|
* @return Token|null |
|
51
|
|
|
* @throws SyntaxErrorException If the stream ends |
|
52
|
|
|
*/ |
|
53
|
60 |
|
public function nextIf($type, $value = null) |
|
54
|
|
|
{ |
|
55
|
60 |
|
if ($this->test($type, $value)) { |
|
56
|
26 |
|
return $this->next(); |
|
57
|
|
|
} |
|
58
|
|
|
|
|
59
|
57 |
|
return null; |
|
60
|
|
|
} |
|
61
|
|
|
|
|
62
|
|
|
/** |
|
63
|
|
|
* @param int $number |
|
64
|
|
|
* @return Token |
|
65
|
|
|
* @throws SyntaxErrorException If the stream ends |
|
66
|
|
|
*/ |
|
67
|
|
|
public function lookAhead($number = 1) |
|
68
|
|
|
{ |
|
69
|
|
|
if (!isset($this->tokens[$this->current + $number])) { |
|
70
|
|
|
throw new SyntaxErrorException('Unexpected end of stream'); |
|
71
|
|
|
} |
|
72
|
|
|
|
|
73
|
|
|
return $this->tokens[$this->current + $number]; |
|
74
|
|
|
} |
|
75
|
|
|
|
|
76
|
|
|
/** |
|
77
|
|
|
* @param int|int[] $type |
|
78
|
|
|
* @param string|string[] $value |
|
79
|
|
|
* @return Token |
|
80
|
|
|
* @throws SyntaxErrorException If the current token isn't expected |
|
81
|
|
|
*/ |
|
82
|
64 |
|
public function expect($type, $value = null) |
|
83
|
|
|
{ |
|
84
|
64 |
|
$token = $this->getCurrent(); |
|
85
|
64 |
|
if (!$this->test($type, $value)) { |
|
86
|
7 |
|
throw new SyntaxErrorException( |
|
87
|
7 |
|
sprintf( |
|
88
|
7 |
|
'Unexpected token "%s" (%s) (%s)', |
|
89
|
7 |
|
$token->getValue(), |
|
90
|
7 |
|
$token->getName(), |
|
91
|
7 |
|
$value === null ? |
|
92
|
7 |
|
sprintf( |
|
93
|
7 |
|
'expected %s', |
|
94
|
7 |
|
implode( |
|
95
|
7 |
|
'|', |
|
96
|
7 |
|
array_map( |
|
97
|
|
|
function ($type) { |
|
98
|
7 |
|
return Token::getTypeName($type); |
|
99
|
7 |
|
}, |
|
100
|
|
|
(array)$type |
|
101
|
7 |
|
) |
|
102
|
7 |
|
) |
|
103
|
7 |
|
) : |
|
104
|
|
|
sprintf( |
|
105
|
|
|
'expected %s (%s)', |
|
106
|
|
|
implode( |
|
107
|
|
|
'|', |
|
108
|
|
|
array_map( |
|
109
|
|
|
function ($value) { |
|
110
|
|
|
return '"' . $value . '"'; |
|
111
|
|
|
}, |
|
112
|
|
|
(array)$type |
|
113
|
|
|
) |
|
114
|
|
|
), |
|
115
|
|
|
implode( |
|
116
|
|
|
'|', |
|
117
|
|
|
array_map( |
|
118
|
|
|
function ($type) { |
|
119
|
|
|
return Token::getTypeName($type); |
|
120
|
|
|
}, |
|
121
|
|
|
(array)$type |
|
122
|
|
|
) |
|
123
|
|
|
) |
|
124
|
|
|
) |
|
125
|
7 |
|
) |
|
126
|
7 |
|
); |
|
127
|
|
|
} |
|
128
|
63 |
|
$this->next(); |
|
129
|
|
|
|
|
130
|
63 |
|
return $token; |
|
131
|
|
|
} |
|
132
|
|
|
|
|
133
|
|
|
/** |
|
134
|
|
|
* Checks whether is end of stream |
|
135
|
|
|
* |
|
136
|
|
|
* @return bool |
|
137
|
|
|
*/ |
|
138
|
64 |
|
public function isEnd() |
|
139
|
|
|
{ |
|
140
|
64 |
|
return $this->tokens[$this->current]->getType() === Token::T_END; |
|
141
|
|
|
} |
|
142
|
|
|
|
|
143
|
|
|
/** |
|
144
|
|
|
* Gets the current token |
|
145
|
|
|
* |
|
146
|
|
|
* @return Token |
|
147
|
|
|
*/ |
|
148
|
81 |
|
public function getCurrent() |
|
149
|
|
|
{ |
|
150
|
81 |
|
return $this->tokens[$this->current]; |
|
151
|
|
|
} |
|
152
|
|
|
|
|
153
|
|
|
/** |
|
154
|
|
|
* @param int|int[] $type |
|
155
|
|
|
* @param string|string[] $value |
|
156
|
|
|
* @return bool |
|
157
|
|
|
*/ |
|
158
|
64 |
|
public function test($type, $value = null) |
|
159
|
|
|
{ |
|
160
|
64 |
|
return $this->tokens[$this->current]->test($type, $value); |
|
161
|
|
|
} |
|
162
|
|
|
} |
|
163
|
|
|
|
xiag-ag /
rql-parser
