| 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 | 4×
2×
1×
38×
38×
38×
38×
38×
1×
3×
18×
3×
1×
1×
1×
1×
1×
4×
4×
20×
20×
20×
10×
4×
2×
4×
2×
1×
1×
1×
1×
1×
1×
1×
7×
7×
7×
7×
7×
3×
4×
4×
7×
2×
| /*
* Copyright 2002-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {SpelNode} from './SpelNode';
/**
* Represents selection over a map or collection.
* For example: {1,2,3,4,5,6,7,8,9,10}.?{#isEven(#this) == 'y'} returns [2, 4, 6, 8, 10]
*
* <p>Basically a subset of the input data is returned based on the
* evaluation of the expression supplied as selection criteria.
*
* @author Andy Clement
* @author Mark Fisher
* @author Sam Brannen
* @author Ben March
* @since 0.2.0
*/
function matches(element, expr, state) {
var doesMatch = false;
state.activeContext.push(element);
doesMatch = expr.getValue(state);
state.activeContext.pop();
return doesMatch;
}
function selectFromArray(collection, whichElement, expr, state) {
var newCollection = collection.filter(function (element) {
return matches(element, expr, state);
});
switch (whichElement) {
case 'ALL':
return newCollection;
case 'FIRST':
return newCollection[0] || null;
case 'LAST':
if (EnewCollection.length) {
return newCollection[newCollection.length - 1];
}
return null;
}
}
function selectFromMap(collection, whichElement, expr, state) {
var newCollection = {},
entry,
key,
entries = [],
returnValue = {};
for (key in collection) {
if (Ecollection.hasOwnProperty(key)) {
entry = {
key: key,
value: collection[key]
};
if (matches(entry, expr, state)) {
entries.push(entry);
}
}
}
switch (whichElement) {
case 'ALL':
entries.forEach(function (entry) {
newCollection[entry.key] = entry.value;
});
return newCollection;
case 'FIRST':
if (Eentries.length) {
returnValue[entries[0].key] = entries[0].value;
return returnValue;
}
return null;
case 'LAST':
if (Eentries.length) {
returnValue[entries[entries.length - 1].key] = entries[entries.length - 1].value;
return returnValue;
}
return null;
}
entries.forEach(function (entry) {
newCollection[entry.key] = entry.value;
});
}
function createNode(nullSafeNavigation, whichElement, position, expr) {
var node = SpelNode.create('selection', position, expr);
node.getValue = function (state) {
var collection = state.activeContext.peek();
if (Ecollection) {
if (Array.isArray(collection)) {
return selectFromArray(collection, whichElement, expr, state);
}
else Eif (typeof collection === 'object') {
return selectFromMap(collection, whichElement, expr, state);
}
}
return null;
};
return node;
}
export var Selection = {
create: createNode,
FIRST: 'FIRST',
LAST: 'LAST',
ALL: 'ALL'
};
|