summaryrefslogtreecommitdiff
path: root/lib/js/urweb.js
blob: be1aea0806a7ef651fdb471e1f95804d435f2d1f (plain)
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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
function cons(v, ls) {
  return { n : ls, v : v };
}

function callAll(ls) {
  for (; ls; ls = ls.n)
    ls.v();
}

function sc(v) {
  return {v : v, h : null};
}
function sv(s, v) {
  s.v = v;
  callAll(s.h);
}
function sg(s) {
  return s.v;
}

function ss(s) {
  return s;
}
function sr(v) {
  return {v : v, h : null};
}
function sb(x,y) {
  var z = y(x.v);
  var s = {v : z.v, h : null};

  function reZ() {
    z.h = cons(function() { s.v = z.v; callAll(s.h); }, z.h);    
  }

  x.h = cons(function() { z = y(x.v); reZ(); s.v = z.v; callAll(s.h); }, x.h);
  reZ();

  return s;
}

function lastParent() {
  var pos = document;

  while (pos.lastChild && pos.lastChild.nodeType == 1)
    pos = pos.lastChild;

  return pos.parentNode;
}

var thisScript = null;

function addNode(node) {
  if (thisScript) {
    thisScript.parentNode.appendChild(node);
    thisScript.parentNode.removeChild(thisScript);
  } else
    lastParent().appendChild(node);
}

function runScripts(node) {
  var savedScript = thisScript;

  var scripts = node.getElementsByTagName("script"), scriptsCopy = {};
  var len = scripts.length;
  for (var i = 0; i < len; ++i)
    scriptsCopy[i] = scripts[i];
  for (var i = 0; i < len; ++i) {
    thisScript = scriptsCopy[i];
    eval(thisScript.textContent);
  }

  thisScript = savedScript;
}

function populate(node, html) {
  node.innerHTML = html;
  runScripts(node);
}

function dyn(s) {
  var x = document.createElement("span");
  populate(x, s.v);
  addNode(x);
  s.h = cons(function() { populate(x, s.v) }, s.h);
}

function inp(t, s) {
  var x = document.createElement(t);
  x.value = s.v;
  addNode(x);
  s.h = cons(function() { x.value = s.v }, s.h);
  x.onkeyup = function() { sv(s, x.value) };
  return x;
}

function eh(x) {
  return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
}

function ts(x) { return x.toString() }
function bs(b) { return (b ? "True" : "False") }

function pi(s) {
  var r = parseInt(s);
  if (r.toString() == s)
    return r;
  else
    throw "Can't parse int: " + s;
}

function pfl(s) {
  var r = parseFloat(s);
  if (r.toString() == s)
    return r;
  else
    throw "Can't parse float: " + s;
}

function whine(msg) {
  alert(msg);
  throw msg;
}

function pf() {
  whine("Pattern match failure");
}

var closures = [];

function ca(f) {
  var n = closures.length;
  closures[n] = f;
  return n;
}

function cr(n) {
  return closures[n]();
}


var client_id = 0;
var client_pass = 0;
var url_prefix = "/";

function getXHR(uri)
{
  try {
    return new XMLHttpRequest();
  } catch (e) {
    try {
     return new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        return new ActiveXObject("Microsoft.XMLHTTP");
      } catch (e) {
        throw "Your browser doesn't seem to support AJAX.";
      }
    }
  }
}

function requestUri(xhr, uri) {
  xhr.open("GET", uri, true);

  if (client_id != 0) {
    xhr.setRequestHeader("UrWeb-Client", client_id.toString());
    xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
  }

  xhr.send(null);
}

function rc(uri, parse, k) {
  var xhr = getXHR();

  xhr.onreadystatechange = function() {
    if (xhr.readyState == 4) {
      var isok = false;

      try {
        if (xhr.status == 200)
          isok = true;
      } catch (e) { }

      if (isok)
        k(parse(xhr.responseText));
      else {
        whine("Error querying remote server!");
      }
    }
  };

  requestUri(xhr, uri);
}

function path_join(s1, s2) {
  if (s1.length > 0 && s1[s1.length-1] == '/')
    return s1 + s2;
  else
    return s1 + "/" + s2;
}

var channels = [];

function newQueue() {
  return { front : null, back : null };
}
function enqueue(q, v) {
  if (q.front == null) {
    q.front = cons(v, null);
    q.back = q.front;
  } else {
    var node = cons(v, null);
    q.back.n = node;
    q.back = node;
  }
}
function dequeue(q) {
  if (q.front == null)
    return null;
  else {
    var r = q.front.v;
    q.front = q.front.n;
    if (q.front == null)
      q.back = null;
    return r;
  }
}

function newChannel() {
  return { msgs : newQueue(), listeners : newQueue() };
}

function listener() {
  var uri = path_join(url_prefix, ".msgs");
  var xhr = getXHR();
  var orsc = function() {
    if (xhr.readyState == 4) {
      var isok = false;

      try {
        if (xhr.status == 200)
          isok = true;
      } catch (e) { }

      if (isok) {
        var lines = xhr.responseText.split("\n");
        if (lines.length < 2) 
          throw "Empty message from remote server";

        for (var i = 0; i+1 < lines.length; i += 2) {
          var chn = lines[i];
          var msg = lines[i+1];

          if (chn < 0)
            whine("Out-of-bounds channel in message from remote server");

          var ch;

          if (chn >= channels.length || channels[chn] == null) {
            ch = newChannel();
            channels[chn] = ch;
          } else
            ch = channels[chn];

          var listener = dequeue(ch.listeners);
          if (listener == null) {
            enqueue(ch.msgs, msg);
          } else {
            listener(msg);
          }
        }

        xhr.onreadystatechange = orsc;
        requestUri(xhr, uri);
      }
      else {
        try {
          whine("Error querying remote server for messages! " + xhr.status);
        } catch (e) { }
      }
    }
  };

  xhr.onreadystatechange = orsc;
  requestUri(xhr, uri);
}

function rv(chn, parse, k) {
  if (chn < 0)
    whine("Out-of-bounds channel receive");

  var ch;

  if (chn >= channels.length || channels[chn] == null) {
    ch = newChannel();
    channels[chn] = ch;
  } else
    ch = channels[chn];

  var msg = dequeue(ch.msgs);
  if (msg == null) {
    enqueue(ch.listeners, function(msg) { k(parse(msg))(null); });
  } else {
    k(parse(msg))(null);
  }
}

function unesc(s) {
  return unescape(s).replace("+", " ");
}