querying.js
1.82 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
var isTag = require("domelementtype").isTag;
module.exports = {
filter: filter,
find: find,
findOneChild: findOneChild,
findOne: findOne,
existsOne: existsOne,
findAll: findAll
};
function filter(test, element, recurse, limit){
if(!Array.isArray(element)) element = [element];
if(typeof limit !== "number" || !isFinite(limit)){
limit = Infinity;
}
return find(test, element, recurse !== false, limit);
}
function find(test, elems, recurse, limit){
var result = [], childs;
for(var i = 0, j = elems.length; i < j; i++){
if(test(elems[i])){
result.push(elems[i]);
if(--limit <= 0) break;
}
childs = elems[i].children;
if(recurse && childs && childs.length > 0){
childs = find(test, childs, recurse, limit);
result = result.concat(childs);
limit -= childs.length;
if(limit <= 0) break;
}
}
return result;
}
function findOneChild(test, elems){
for(var i = 0, l = elems.length; i < l; i++){
if(test(elems[i])) return elems[i];
}
return null;
}
function findOne(test, elems){
var elem = null;
for(var i = 0, l = elems.length; i < l && !elem; i++){
if(!isTag(elems[i])){
continue;
} else if(test(elems[i])){
elem = elems[i];
} else if(elems[i].children.length > 0){
elem = findOne(test, elems[i].children);
}
}
return elem;
}
function existsOne(test, elems){
for(var i = 0, l = elems.length; i < l; i++){
if(
isTag(elems[i]) && (
test(elems[i]) || (
elems[i].children.length > 0 &&
existsOne(test, elems[i].children)
)
)
){
return true;
}
}
return false;
}
function findAll(test, elems){
var result = [];
for(var i = 0, j = elems.length; i < j; i++){
if(!isTag(elems[i])) continue;
if(test(elems[i])) result.push(elems[i]);
if(elems[i].children.length > 0){
result = result.concat(findAll(test, elems[i].children));
}
}
return result;
}