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
161
162
163
164
165
166
167
168
169
|
(function() {
// states
// 0: uncensored
// 1: start_censor
// 2: censored
// state transition probabilities:
var p_trans = [
// x uncensored -> uncensored
0.08, // uncensored -> start_censor
// 0 uncensored -> censored
// 0 start_censor -> uncensored
// 0 start_censor -> start_censor
// 1 start_censor -> censored
0.55, // censored -> uncensored
// 0 censored -> start_censor
// x censored -> censored
];
var censored_tag = "span";
var censored_class = "censored";
var start_censor = "<" + censored_tag + " class=\"" + censored_class + "\">";
var stop_censor = "</" + censored_tag + ">";
var re_censor = /[0-9A-Za-z]/;
var isCensored = true;
var censoredElements = [];
function splitWords(text) {
// some older IEs don't suppport capturing parentheses
// return text.split(/([\t\n\r ])/);
if (text.length === 0) {
return [""];
}
var words = [];
var last_i = 0;
for (var i = 0; i < text.length; i++) {
switch(text[i]) {
case '\t':
case '\n':
case '\r':
case ' ':
if (last_i !== i) {
words.push(text.slice(last_i, i));
}
words.push(text[i]);
last_i = i + 1;
}
}
if (last_i !== text.length) {
words.push(text.slice(last_i));
}
return words;
}
function censorWord(state, word) {
// ignore words not containing letters (may be spaces only)
if (!word.match(re_censor)) {
return word;
}
var r = Math.random();
var prefix = "";
var suffix = "";
if (state.s === 1) {
// start_censor -> censored
state.s = 2;
prefix = start_censor;
}
if (state.s === 0 && r < p_trans[0]) {
// uncensored -> start_censor
state.s = 1;
}
else if (state.s === 2 && r < p_trans[1]) {
// censored -> uncensored
state.s = 0;
suffix = stop_censor;
}
return prefix + word + suffix;
}
function censorTextNode(node) {
var state = { s: 0 };
if (Math.random() < p_trans[0]) {
// start_censor
state.s = 1;
}
var words = splitWords(node.nodeValue);
for (var i in words) {
words[i] = censorWord(state, words[i]);
}
if (state.s === 2) {
words[words.length-1] = words[words.length-1] + stop_censor;
}
var newnode = document.createElement(censored_tag);
newnode.innerHTML = words.join("");
return newnode;
}
function censorElement(element, on) {
var childs = element.childNodes;
var uncensored = false;
for (var i in childs) {
if (childs[i].nodeType === 1 &&
childs[i].nodeName !== "OPTION" &&
childs[i].nodeName !== "SCRIPT" &&
childs[i].nodeName !== "SELECT" &&
childs[i].nodeName !== "STYLE" &&
childs[i].nodeName !== "TEXTAREA" &&
childs[i].nodeName !== "TITLE")
{
if (!on &&
childs[i].nodeName === censored_tag.toUpperCase() &&
childs[i].className === censored_class &&
childs[i].childNodes.length === 1)
{
uncensored = true;
element.replaceChild(childs[i].childNodes[0], childs[i]);
}
var childUncensored = censorElement(childs[i], on);
if (!on && childUncensored)
{
var newnode = document.createTextNode("");
for (var j in childs[i].childNodes) {
if (!childs[i].childNodes[j].nodeType === 3) {
return;
}
if (childs[i].childNodes[j].nodeValue) {
newnode.nodeValue += childs[i].childNodes[j].nodeValue;
}
}
element.replaceChild(newnode, childs[i]);
}
}
else if (on &&
childs[i].nodeType === 3 &&
childs[i].nodeValue.match(re_censor))
{
element.replaceChild(censorTextNode(childs[i]), childs[i]);
}
}
return uncensored;
}
function doCensor(on) {
for (var i in censoredElements) {
censorElement(censoredElements[i], on);
}
}
window.zensurjs = function(arg) {
if (arg === undefined) {
isCensored = !isCensored;
doCensor(isCensored);
}
else {
censoredElements.push(arg);
if (isCensored) {
censorElement(arg, true);
}
}
return isCensored;
};
})();
|
