CFDBTransformParser.php
6.4 KB
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
<?php
/*
"Contact Form to Database" Copyright (C) 2011-2014 Michael Simpson (email : michael.d.simpson@gmail.com)
This file is part of Contact Form to Database.
Contact Form to Database is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Contact Form to Database is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Contact Form to Database.
If not, see <http://www.gnu.org/licenses/>.
*/
require_once('CFDBParserBase.php');
require_once('CFDBTransformByFunctionIterator.php');
require_once('CFDBTransformByClassIterator.php');
require_once('CFDBTransformEndpoint.php');
// Includes these just to have them as known classes in case they are in the transform.
require_once('SortByField.php');
require_once('SortByMultiField.php');
require_once('NaturalSortByField.php');
require_once('NaturalSortByMultiField.php');
require_once('SortByDateField.php');
require_once('SummationRow.php');
require_once('CountField.php');
require_once('SumField.php');
require_once('MinField.php');
require_once('MaxField.php');
require_once('AverageField.php');
require_once('TotalField.php');
require_once('cfdb-transform-functions.php');
class CFDBTransformParser extends CFDBParserBase {
var $tree = array();
/**
* @var array[CFDBDataIterator]
*/
var $transformIterators = array();
public function getExpressionTree() {
return $this->tree;
}
public function parse($string) {
$arrayOfANDedStrings = $this->parseANDs($string); // e.g. "xx=yy()&&zz()" -> ["xx=yy(a,b,c)", "zz"]
foreach ($arrayOfANDedStrings as $expressionString) {
$rawExpression = $this->parseExpression(trim($expressionString)); // e.g. ["xx" "=" "yy(a,b,c)"] or ["zz"]
if (empty($rawExpression)) {
continue;
}
$expression = array();
$function = null;
if (count($rawExpression) >= 3) { // e.g. ["xx" "=" "yy(a,b,c)"]
$expression[] = trim($rawExpression[0]); // field name
$expression[] = trim($rawExpression[1]); // =
$function = trim($rawExpression[2]); // function call
} else {
$function = trim($rawExpression[0]); // function call
}
$function = $this->parseValidFunctionOrClassTransform($function); // ["zz(a,b,c)"] -> ["zz", "a", "b", "c"]
if (is_array($function)) {
$expression = array_merge($expression, $function);
} else {
$expression[] = $function;
}
$this->tree[] = $expression;
}
}
/**
* Parse a comparison expression into its three components
* @param $comparisonExpression string in the form 'value1' . 'operator' . 'value2' where
* operator is a php comparison operator or '='
* @return array of string [ value1, operator, value2 ]
*/
public function parseExpression($comparisonExpression) {
return preg_split('/(=)/', $comparisonExpression, -1,
PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
}
public function setupTransforms() {
if ($this->tree) {
/** @var $previousTransformIterator CFDBDataIteratorDecorator */
$previousTransformIterator = null;
foreach ($this->tree as $transformArray) {
// [field, =, func, a1, a2, ...] or [func] or [class] or [class, a1, a2, ...]
$transform = null;
if (!empty($transformArray)) {
$transform = null;
if (class_exists($transformArray[0])) {
$reflect = new ReflectionClass($transformArray[0]);
$args = array_slice($transformArray, 1);
$instance = $reflect->newInstanceArgs($args);
$transform = new CFDBTransformByClassIterator();
/** @var $instance CFDBTransform */
$transform->setTransformObject($instance);
} else {
// assume it is a function
$transform = new CFDBTransformByFunctionIterator();
$transform->setFunctionEvaluator($this->functionEvaluator);
if (count($transformArray) > 1 && $transformArray[1] == '=') {
// [field_name, =, function_name, arg1, arg2, ...]
$transform->setFieldToAssign($transformArray[0]);
$transform->setFunctionArray(array_slice($transformArray, 2));
} else {
// [function_name, arg1, arg2, ...]
$transform->setFunctionArray($transformArray);
}
}
// Set the data source for each transform as the previous transform
// to set up a pipeline/decorator pattern.
// The first transform is left with null data source to be hooked up later
// to query results.
$transform->setSource($previousTransformIterator); // is null for first one
$previousTransformIterator = $transform;
$this->transformIterators[] = $transform;
}
}
if ($previousTransformIterator) {
// Stick a CFDBTransformEndpoint at the end of the list of transforms
$transform = new CFDBTransformEndpoint();
$transform->setSource($previousTransformIterator);
$this->transformIterators[] = $transform;
}
}
}
/**
* @param $dataSource CFDBDataIterator
*/
public function setDataSource($dataSource) {
if (count($this->transformIterators) > 0) {
$this->transformIterators[0]->setSource($dataSource);
}
}
/**
* @return CFDBDataIteratorDecorator
*/
public function getIterator() {
return end($this->transformIterators);
}
}