1 files changed, 149 insertions, 0 deletions
diff --git a/trunk/infrastructure/framework-src/modules/dispatch.js b/trunk/infrastructure/framework-src/modules/dispatch.js
new file mode 100644
index 0000000..e7e3ef0
--- /dev/null
+++ b/trunk/infrastructure/framework-src/modules/dispatch.js
@@ -0,0 +1,149 @@
+/**
+ * Copyright 2009 Google Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileOverview Dispatching for dynamic pages and static files rendered from disk.
+ */
+
+import("jsutils.eachProperty");
+import("stringutils");
+
+jimport("java.lang.System.out.println");
+
+//----------------------------------------------------------------
+// Util
+//----------------------------------------------------------------
+
+function PrefixMatcher(p) {
+  var rs = p.replace(/([\[\]\^\$\\\.\*\+\?\(\)\{\}\|])/g, "\\$1");
+  var r = new RegExp('^' + rs + '(.*)$');
+  return function(path) {
+    return r.exec(path);
+  }
+}
+
+// Like PrefixMatcher, but makes trailing '/' optional, as in /ep/admin or /ep/admin/.
+// If trailing '/' is omitted, will redirect to same path with trailing /.
+function DirMatcher(p) {
+  if (p.substr(-1) == '/') {
+    p = p.substr(0, p.length-1);
+  }
+  var prefixMatcher = PrefixMatcher(p+'/');
+  return function(path) {
+    if (path == p) {
+      response.redirect(p+'/');
+    }
+    return prefixMatcher(path);
+  }
+}
+
+function _pathMatches(p, loc) {
+  // returns a regex-result kind of array with length >= 1, or null
+  if (typeof(loc) == 'string') {
+    return (p == loc) ? [loc] : null;
+  }
+  if (typeof(loc) == 'function') {
+    return (loc(p) || null);
+  }
+  if (loc.exec) { // regexp
+    var r = loc.exec(p);
+    return r || null;
+  }
+  throw new Error('Uknown type of location: '+loc);
+}
+
+//----------------------------------------------------------------
+// Dispatcher
+//----------------------------------------------------------------
+
+var Dispatcher = function() {
+  this._routes = [];  // Array([location, (local file path or function)])
+};
+
+Dispatcher.prototype.addLocations = function(l) {
+  var that = this;
+  l.forEach(function(x) { that._routes.push(x); });
+};
+
+Dispatcher.prototype.dispatch = function() {
+  var p = request.path;
+  var served = false;
+
+  for (var i = 0; (i < this._routes.length) && (served == false); i++) {
+    var loc = this._routes[i][0];
+    var dst = this._routes[i][1];
+
+    var match = _pathMatches(p, loc);
+    if (match) {
+      if (typeof(dst) != 'function') {
+	throw new Error('dispatch only dispatches to functions, and this is not a function: '+typeof(dst));
+      }
+      
+      // call dst(group1, group2, group3, ...)
+      served = dst.apply(this, Array.prototype.slice.call(match, 1));
+    }
+  };
+
+  return served;
+};
+
+//----------------------------------------------------------------
+// fdisp
+//----------------------------------------------------------------
+
+function forward(module) {
+  return function(name) {
+    if (name === "") {
+      name = "main";
+    }
+    if (name) {
+      name = name.replace(/\-/g, '_');
+    }
+    var onreq = module['onRequest'];
+    var f = module['render_'+name];
+    var fg = module['render_'+name+'_get'];
+    var fp = module['render_'+name+'_post'];
+
+    var served = false;
+    
+    if (onreq) { 
+      served = onreq(name);
+    }
+
+    if (served) {
+      return true;
+    }
+
+    var method = request.method;
+    if (method == "HEAD") {
+      method = "GET";
+    }
+    
+    if (f) { 
+      f();
+      served = true;
+    } else if (method == "GET" && fg) {
+      fg();
+      served = true;
+    } else if (method == "POST" && fp) {
+      fp();
+      served = true;
+    }
+
+    return served;
+  };
+}
+