-
Notifications
You must be signed in to change notification settings - Fork 5
/
sherpa.js
475 lines (447 loc) · 16.4 KB
/
sherpa.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
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
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
RegExp.escape = function(text) {
if (!arguments.callee.sRE) {
var specials = [
'/', '.', '*', '+', '?', '|',
'(', ')', '[', ']', '{', '}', '\\'
];
arguments.callee.sRE = new RegExp(
'(\\' + specials.join('|\\') + ')', 'g'
);
}
return text.replace(arguments.callee.sRE, '\\$1');
}
Sherpa = {
SplitRegex: /\//,
Router: function(options) {
this.routes = {};
this.root = new Sherpa.Node();
this.requestKeys = options && options['requestKeys'] || ['method'];
},
Path: function(route, uri) {
this.route = route;
var sys = require('sys');
sys.debug(sys.inspect(uri));
var regex = /(\/|:[a-zA-Z0-9_]+|(?:\\:|[^:\/]+)*)/;
var splitUri = uri.split(regex);
this.compiledUri = [];
for (var splitUriIdx = 0; splitUriIdx != splitUri.length; splitUriIdx++) {
if (splitUri[splitUriIdx].substring(0, 1) == ':') {
this.compiledUri.push("params['" + splitUri[splitUriIdx].substring(1) + "']");
} else {
this.compiledUri.push("'" + splitUri[splitUriIdx] + "'");
}
}
this.compiledUri = this.compiledUri.join('+');
this.groups = [];
for (var splitIndex = 0; splitIndex < splitUri.length; splitIndex++) {
var part = splitUri[splitIndex];
if (part == '/') {
sys.debug('adding new group');
this.groups.push([]);
} else if (part != '') {
sys.debug('pushing to last group');
this.groups[this.groups.length - 1].push(part);
}
}
},
Route: function(router, uri) {
var sys = require('sys');
this.router = router;
this.requestConditions = {};
this.matchingConditions = {};
this.variableNames = [];
var paths = [""];
var chars = uri.split('');
var startIndex = 0;
var endIndex = 1;
for (var charIndex in chars) {
var c = chars[charIndex];
if (c == '(') {
// over current working set, double paths
for (var pathIndex = startIndex; pathIndex != endIndex; pathIndex++) {
paths.push(paths[pathIndex]);
}
// move working set to newly copied paths
startIndex = endIndex;
endIndex = paths.length;
} else if (c == ')') {
// expand working set scope
startIndex -= (endIndex - startIndex);
} else {
for (var i = startIndex; i != endIndex; i++) {
paths[i] += c;
}
}
}
this.partial = false;
this.paths = [];
for (var pathsIdx = 0; pathsIdx != paths.length; pathsIdx++) {
sys.debug("ADDING PATH "+paths[pathsIdx]);
this.paths.push(new Sherpa.Path(this, paths[pathsIdx]));
}
},
Node: function() {
this.reset();
},
Response: function(path, params) {
var sys = require('sys');
sys.debug("path --> "+sys.inspect(path));
this.path = path
this.route = path.route;
this.paramsArray = params;
this.destination = this.route.destination;
this.params = {};
for (var varIdx = 0; varIdx != this.path.variableNames.length; varIdx++) {
this.params[this.path.variableNames[varIdx]] = this.paramsArray[varIdx];
}
}
};
Sherpa.Node.prototype = {
reset: function() {
this.linear = [];
this.lookup = {};
this.catchall = null;
},
dup: function() {
var newNode = new Sherpa.Node();
for(var idx = 0; idx != this.linear.length; idx++) {
newNode.linear.push(this.linear[idx]);
}
for(var key in this.lookup) {
newNode.lookup[key] = this.lookup[key];
}
newNode.catchall = this.catchall;
return newNode;
},
addLinear: function(regex, count) {
var newNode = new Sherpa.Node();
this.linear.push([regex, count, newNode]);
return newNode;
},
addCatchall: function() {
if (!this.catchall) {
this.catchall = new Sherpa.Node();
}
return this.catchall;
},
addLookup: function(part) {
if (!this.lookup[part]) {
this.lookup[part] = new Sherpa.Node();
}
return this.lookup[part];
},
addRequestNode: function() {
if (!this.requestNode) {
this.requestNode = new Sherpa.Node();
this.requestNode.requestMethod = null;
}
return this.requestNode;
},
find: function(parts, request, params) {
var sys = require('sys');
sys.debug("find on parts: " + sys.inspect(parts) + " with params: "+sys.inspect(params)+" partial?"+(this.destination && this.destination.route.partial));
if (this.requestNode || this.destination && this.destination.route.partial) {
sys.debug("potential partial match");
var target = this;
if (target.requestNode) {
sys.debug("partial match has a request node");
target = target.requestNode.findRequest(request);
}
sys.debug("finally testing the destination");
if (target && target.destination && target.destination.route.partial) {
sys.debug("yup, we have one");
return new Sherpa.Response(target.destination, params);
} else {
sys.debug("nope, movign on");
}
}
if (parts.length == 0) {
var target = this;
if (this.requestNode) {
sys.debug("there is a request node here..");
target = this.requestNode.findRequest(request);
}
if (target) sys.debug("destination?: " + sys.inspect(target.destination));
return target && target.destination ? new Sherpa.Response(target.destination, params) : undefined;
} else {
if (this.linear.length != 0) {
var wholePath = parts.join('/');
for (var linearIdx = 0; linearIdx != this.linear.length; linearIdx++) {
var lin = this.linear[linearIdx];
var match = lin[0].exec(wholePath);
sys.debug("matched:"+sys.inspect(match));
if (match) {
matchedIndex = match.shift().length;
var resplitParts = wholePath.substring(matchedIndex).split('/');
if (resplitParts.length == 1 && resplitParts[0] == '') resplitParts.shift();
var potentialMatch = lin[2].find(resplitParts, request, params.concat(match));
if (potentialMatch) return potentialMatch;
}
}
}
if (this.lookup[parts[0]]) {
var potentialMatch = this.lookup[parts[0]].find(parts.slice(1, parts.size), request, params);
if (potentialMatch) return potentialMatch;
}
if (this.catchall) {
var part = parts.shift();
params.push(part);
return this.catchall.find(parts, request, params);
}
}
return undefined;
},
findRequest: function(request) {
var sys = require('sys');
if (this.requestMethod) {
sys.debug("there is a request method: " + this.requestMethod);
sys.debug("the current request has: " + request[this.requestMethod]);
if (this.linear.length != 0 && request[this.requestMethod]) {
sys.debug("doing a linear search");
for (var linearIdx = 0; linearIdx != this.linear.length; linearIdx++) {
var lin = this.linear[linearIdx];
var match = lin[0].exec(request[this.requestMethod]);
sys.debug("matched:"+sys.inspect(match));
if (match) {
matchedIndex = match.shift().length;
var potentialMatch = lin[2].findRequest(request);
if (potentialMatch) return potentialMatch;
}
}
}
if (request[this.requestMethod] && this.lookup[request[this.requestMethod]]) {
sys.debug("doing a lookup search");
var potentialMatch = this.lookup[request[this.requestMethod]].findRequest(request);
if (potentialMatch) {
sys.debug("found one..");
return potentialMatch;
}
}
if (this.catchall) {
sys.debug("doing a catchall search");
return this.catchall.findRequest(request);
}
sys.debug("no search succeeded");
} else if (this.destination) {
sys.debug("there is a destination");
return this;
} else {
sys.debug("we got nothin'");
return undefined;
}
},
transplantValue: function() {
var sys = require('sys');
sys.debug("transplantValue this.destination:..." + sys.inspect(this.destination));
sys.debug("transplantValue this.requestNode:..." + sys.inspect(this.requestNode));
if (this.destination && this.requestNode) {
sys.debug("there is a destination");
var targetNode = this.requestNode;
while (targetNode.requestMethod) {
sys.debug("adding a catchall");
targetNode = (targetNode.addCatchall());
}
sys.debug("re-applying destination");
targetNode.destination = this.destination;
this.destination = undefined;
} else {
sys.debug("there is NOT a destination");
sys.debug(sys.inspect(this.requestNode));
}
sys.debug("done transplantValue...");
},
compileRequestConditions: function(router, requestConditions) {
var sys = require('sys');
//raise(UnsupportedRequestConditionError.new) if (request_options.keys & RequestNode::RequestMethods).size != request_options.size
var currentNodes = [this];
var requestMethods = router.requestKeys;
sys.debug("compiling for these request conditions: "+sys.inspect(requestConditions));
for (var requestMethodIdx in requestMethods) {
var method = requestMethods[requestMethodIdx];
sys.debug("looking at method: "+method);
if (requestConditions[method]) {// so, the request method we care about it ..
sys.debug("we care about this method " + sys.inspect(requestConditions[method]));
if (currentNodes.length == 1 && currentNodes[0] === this) {
sys.debug("currentNodes is in the initial state");
currentNodes = [this.addRequestNode()];
} else {
sys.debug("currentNodes is NOT in the initial state");
}
for (var currentNodeIndex = 0; currentNodeIndex != currentNodes.length; currentNodeIndex++) {
var currentNode = currentNodes[currentNodeIndex];
if (!currentNode.requestMethod) {
currentNode.requestMethod = method
}
var masterPosition = requestMethods.indexOf(method);
var currentPosition = requestMethods.indexOf(currentNode.requestMethod);
if (masterPosition == currentPosition) {
sys.debug("doing a lookup add on "+method+" "+requestConditions[method]);
if (requestConditions[method].compile) {
currentNodes[currentNodeIndex] = currentNodes[currentNodeIndex].addLinear(requestConditions[method], 0);
} else {
currentNodes[currentNodeIndex] = currentNodes[currentNodeIndex].addLookup(requestConditions[method]);
}
} else if (masterPosition < currentPosition) {
sys.debug("adding to the catchall");
currentNodes[currentNodeIndex] = currentNodes[currentNodeIndex].addCatchall();
} else {
sys.debug("got no where to go...");
var nextNode = currentNode.dup();
currentNode.reset();
currentNode.requestMethod = method;
currentNode.catchall = nextNode;
currentNodeIndex--;
}
}
sys.debug("all done");
//current_nodes.flatten!
} else {
sys.debug("we don't care about this method");
for (var currentNodeIndex = 0; currentNodeIndex != currentNodes.length; currentNodeIndex++) {
sys.debug("examining node "+currentNodeIndex);
var node = currentNodes[currentNodeIndex];
if (!node.requestMethod && node.requestNode) {
sys.debug("using the requestNode");
node = node.requestNode;
}
if (node.requestMethod) {
currentNodes[currentNodeIndex] = node.addCatchall();
currentNodes[currentNodeIndex].requestMethod = null;
}
}
}
}
this.transplantValue();
return currentNodes;
}
};
Sherpa.Router.prototype = {
generate: function(name, params) {
return this.routes[name].generate(params);
},
add: function(uri) {
return new Sherpa.Route(this, uri);
},
recognize: function(path, request) {
if (path.substring(0,1) == '/') path = path.substring(1);
return this.root.find(path == '' ? [] : path.split(/\//), request, []);
}
};
Sherpa.Route.prototype = {
name: function(routeName) {
this.router.routes[routeName] = this;
return this;
},
matchPartially: function() {
this.partial = true;
return this;
},
matchesWith: function(matches) {
for (var matchesKey in matches) {
this.matchingConditions[matchesKey] = matches[matchesKey];
}
return this;
},
compile: function() {
for(var pathIdx = 0; pathIdx != this.paths.length; pathIdx++) {
this.paths[pathIdx].compile();
for (var variableIdx = 0; variableIdx != this.paths[pathIdx].variableNames.length; variableIdx++) {
if (this.variableNames.indexOf(this.paths[pathIdx].variableNames[variableIdx]) == -1) this.variableNames.push(this.paths[pathIdx].variableNames[variableIdx]);
}
}
},
to: function(destination) {
this.compile();
this.destination = destination;
return this;
},
condition: function(conditions) {
for (var conditionKey in conditions) {
this.requestConditions[conditionKey] = conditions[conditionKey];
}
return this;
},
generate: function(params) {
if (params == undefined || this.paths.length == 1) {
return this.paths[0].generate(params);
} else {
for(var pathIdx = 0; pathIdx != this.paths.length == 1; pathIdx++) {
var path = this.paths[pathIdx].generate(params);
if (path) return path;
}
return undefined;
}
}
};
Sherpa.Path.prototype = {
generate: function(params) {
var sys = require('sys');
sys.debug("path generate for "+sys.inspect(params) + " from "+sys.inspect(this.variableNames));
for (var paramsKey in params) {
if (this.variableNames.indexOf(paramsKey) == -1) return undefined;
}
sys.debug("passed for "+sys.inspect(params));
for(var varIdx = 0; varIdx != this.variableNames.length; varIdx++) {
sys.debug("testing: "+this.variableNames[varIdx] + " --> " + this.route.matchingConditions[this.variableNames[varIdx]]);
if (this.route.matchingConditions[this.variableNames[varIdx]]) {
if (this.route.matchingConditions[this.variableNames[varIdx]].exec(params[this.variableNames[varIdx]].toString()) != params[this.variableNames[varIdx]].toString()) {
sys.debug("regex exec didn't work...");
return undefined;
} else {
sys.debug("regex exec worked");
}
} else {
sys.debug("matchesWith doesn't exist...");
}
}
return eval(this.compiledUri);
},
compile: function() {
var sys = require('sys');
sys.debug("groups:"+sys.inspect(this.groups));
this.variableNames = [];
var currentNode = this.route.router.root;
for(var groupIdx = 0; groupIdx != this.groups.length; groupIdx++) {
var group = this.groups[groupIdx];
sys.debug(groupIdx);
sys.debug(sys.inspect(group));
if (group.length > 1) {
var pattern = '^';
for (var partIndex = 0; partIndex != group.length; partIndex++) {
var part = group[partIndex];
var captureCount = 0
if (part.substring(0,1) == ':') {
var variableName = part.substring(1);
this.variableNames.push(variableName);
pattern += this.route.matchingConditions[variableName] ? this.route.matchingConditions[variableName].toString() : '(.*?)'
captureCount += 1
} else {
pattern += RegExp.escape(part);
}
}
sys.debug("PATTERN:" + sys.inspect(pattern));
currentNode = currentNode.addLinear(new RegExp(pattern), captureCount);
} else if (group.length == 1) {
var part = group[0];
if (part.substring(0,1) == ':') {
var variableName = part.substring(1);
this.variableNames.push(variableName);
if (this.route.matchingConditions[variableName]) {
currentNode = currentNode.addLinear(this.route.matchingConditions[variableName], 1);
} else {
currentNode = currentNode.addCatchall();
}
} else {
currentNode = currentNode.addLookup(part);
}
}
}
var nodes = currentNode.compileRequestConditions(this.route.router, this.route.requestConditions);
for (var nodeIdx = 0; nodeIdx != nodes.length; nodeIdx++) {
sys.debug("adding a destination to " + sys.inspect(nodes[nodeIdx]));
nodes[nodeIdx].destination = this;
}
}
};
Sherpa.Response.prototype = {
};