-
Notifications
You must be signed in to change notification settings - Fork 3
/
index.js
133 lines (102 loc) · 2.87 KB
/
index.js
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
var matchTuple = /^(.*?)\:(.*?)$/,
matchKey = /^(?:[^\\.]|\\.)*/,
merge = require('flat-merge'),
revive = require('statham/revive'),
NonExistant = {};
function isObject(value){
return value && (typeof value === 'object' || typeof value === 'function');
}
function pathToParts(path){
var parts = [],
match;
do{
match = path.match(matchKey);
if(match){
parts.push(match[0].replace(/\\(.)/g, function(match){
return match.slice(1);
}));
path = path.slice(match[0].length + 1);
}
}while(path);
return parts;
}
function getSourceAndTarget(path){
var match = path.match(matchTuple),
source = match ? match[1] : path,
target = match ? match[2] : path;
return [source, target];
}
function get(data, path){
var parts = pathToParts(path),
target = data;
while(parts.length){
var targetKey = parts.shift();
if(!isObject(target) || !(targetKey in target)){
return NonExistant; // The requested leaf didn't exist.
}
target = target[targetKey];
}
return target;
};
function set(data, path, value){
var parts = pathToParts(path),
target = data;
// The source data did not contain the leaf,
// do not add it to the result.
if(value === NonExistant){
return;
}
while(parts.length){
var targetKey = parts.shift();
if(parts.length === 0){
target[targetKey] = value;
return;
}
if(!isObject(target[targetKey])){
target[targetKey] = isNaN(targetKey) ? {} : [];
}
target = target[targetKey];
}
};
function remove(data, path){
var parts = pathToParts(path),
target = data;
while(parts.length){
var targetKey = parts.shift();
if(parts.length === 0){
target && (delete target[targetKey]);
return;
}
if(!isObject(target)){
return;
}
target = target[targetKey];
}
};
function cherrypick(object, exclude, properties){
if(!object || typeof object !== 'object') {
return object;
}
if(typeof exclude !== 'boolean'){
properties = exclude;
exclude = false;
}
var result = exclude ? revive(object) : new object.constructor();
if(properties == null){
return result;
}
properties = ('' + properties).split(' ');
for (var i = properties.length - 1; i >= 0; i--) {
var path = properties[i],
sourceAndTarget = getSourceAndTarget(path),
source = sourceAndTarget[0],
target = sourceAndTarget[1];
if(exclude){
remove(result, target);
}else{
set(result, target, get(object, source));
}
};
return result;
}
module.exports = cherrypick;