From 906d543b0e2cb16421702ebe8b878b21415c16a0 Mon Sep 17 00:00:00 2001
From: Brad Anderson <brad@cloudant.com>
Date: Fri, 20 Aug 2010 10:15:57 -0400
Subject: build couchjs with scons

---
 apps/couch/js/loop.js | 140 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 apps/couch/js/loop.js

(limited to 'apps/couch/js/loop.js')

diff --git a/apps/couch/js/loop.js b/apps/couch/js/loop.js
new file mode 100644
index 00000000..300151e9
--- /dev/null
+++ b/apps/couch/js/loop.js
@@ -0,0 +1,140 @@
+// 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.
+
+var sandbox = null;
+
+function init_sandbox() {
+  try {
+    // if possible, use evalcx (not always available)
+    sandbox = evalcx('');
+    sandbox.emit = Views.emit;
+    sandbox.sum = Views.sum;
+    sandbox.log = log;
+    sandbox.toJSON = Couch.toJSON;
+    sandbox.JSON = JSON;
+    sandbox.provides = Mime.provides;
+    sandbox.registerType = Mime.registerType;
+    sandbox.start = Render.start;
+    sandbox.send = Render.send;
+    sandbox.getRow = Render.getRow;
+  } catch (e) {
+    log(e.toSource());
+  }
+};
+init_sandbox();
+
+// Commands are in the form of json arrays:
+// ["commandname",..optional args...]\n
+//
+// Responses are json values followed by a new line ("\n")
+
+var DDoc = (function() {
+  var ddoc_dispatch = {
+    "lists"     : Render.list,
+    "shows"    : Render.show,
+    "filters"   : Filter.filter,
+    "updates"  : Render.update,
+    "validate_doc_update" : Validate.validate
+  };
+  var ddocs = {};
+  return {
+    ddoc : function() {
+      var args = [];
+      for (var i=0; i < arguments.length; i++) {
+        args.push(arguments[i]);
+      };
+      var ddocId = args.shift();
+      if (ddocId == "new") {
+        // get the real ddocId.
+        ddocId = args.shift();
+        // store the ddoc, functions are lazily compiled.
+        ddocs[ddocId] = args.shift();
+        print("true");
+      } else {
+        // Couch makes sure we know this ddoc already.
+        var ddoc = ddocs[ddocId];
+        if (!ddoc) throw(["fatal", "query_protocol_error", "uncached design doc: "+ddocId]);
+        var funPath = args.shift();
+        var cmd = funPath[0];
+        // the first member of the fun path determines the type of operation
+        var funArgs = args.shift();
+        if (ddoc_dispatch[cmd]) {
+          // get the function, call the command with it
+          var point = ddoc;
+          for (var i=0; i < funPath.length; i++) {
+            if (i+1 == funPath.length) {
+              fun = point[funPath[i]]
+              if (typeof fun != "function") {
+                fun = Couch.compileFunction(fun, ddoc);
+                // cache the compiled fun on the ddoc
+                point[funPath[i]] = fun
+              };
+            } else {
+              point = point[funPath[i]]              
+            }
+          };
+
+          // run the correct responder with the cmd body
+          ddoc_dispatch[cmd].apply(null, [fun, ddoc, funArgs]);
+        } else {
+          // unknown command, quit and hope the restarted version is better
+          throw(["fatal", "unknown_command", "unknown ddoc command '" + cmd + "'"]);
+        }
+      }
+    }
+  };
+})();
+
+var Loop = function() {
+  var line, cmd, cmdkey, dispatch = {
+    "ddoc"     : DDoc.ddoc,
+    // "view"    : Views.handler,
+    "reset"    : State.reset,
+    "add_fun"  : State.addFun,
+    "map_doc"  : Views.mapDoc,
+    "reduce"   : Views.reduce,
+    "rereduce" : Views.rereduce
+  };
+  function handleError(e) {
+    var type = e[0];
+    if (type == "fatal") {
+      e[0] = "error"; // we tell the client it was a fatal error by dying
+      respond(e);
+      quit(-1);
+    } else if (type == "error") {
+      respond(e);
+    } else if (e.error && e.reason) {
+      // compatibility with old error format
+      respond(["error", e.error, e.reason]);
+    } else {
+      respond(["error","unnamed_error",e.toSource()]);
+    }
+  };
+  while (line = readline()) {
+    cmd = eval('('+line+')');
+    State.line_length = line.length;
+    try {
+      cmdkey = cmd.shift();
+      if (dispatch[cmdkey]) {
+        // run the correct responder with the cmd body
+        dispatch[cmdkey].apply(null, cmd);
+      } else {
+        // unknown command, quit and hope the restarted version is better
+        throw(["fatal", "unknown_command", "unknown command '" + cmdkey + "'"]);
+      }
+    } catch(e) {
+      handleError(e);
+    }
+  };
+};
+
+Loop();
-- 
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