Revert "Add optional filters to stream.pipe()"

This reverts commit 24aded078f.

doc/api/streams.markdown

@@ -65,7 +65,7 @@ Resumes the incoming `'data'` events after a `pause()`.
 
 Closes the underlying file descriptor. Stream will not emit any more events.
 
-### stream.pipe(destination, [options], [filter])
+### stream.pipe(destination, [options])
 
 This is a `Stream.prototype` method available on all `Stream`s.
 
@@ -92,48 +92,6 @@ NOTE: If the source stream does not support `pause()` and `resume()`, this funct
 adds simple definitions which simply emit `'pause'` and `'resume'` events on
 the source stream.
 
-
-The `filter` argument is an optional callback which can be used to filter all
-data passing through the pipe. This makes it easy to do arbitrary transforms
-(like gzip) while still maintaining the proper throttling. `filter` gets
-three arguments: a buffer, a write function, and a done function. Here is an
-example of a chat which uses a `filter` to append each message with the
-address of the sender.
-
-    var net = require('net');
-    var people = [];
-
-    function address(socket) {
-      return '<' + socket.remoteAddress + ':' + socket.remotePort + '> ';
-    }
-
-    net.Server(function (socket) {
-      socket.write("hello!\r\n");
-
-      people.forEach(function (p) {
-        socket.pipe(p, { end: false }, function (d, write, done) {
-          write(address(socket));
-          write(d);
-          done();
-        });
-
-        p.pipe(socket, { end: false }, function (d, write, done) {
-          write(address(p));
-          write(d);
-          done();
-        });
-      });
-
-      people.push(socket);
-
-      socket.on('end', function () {
-        people.splice(people.indexOf(socket), 1);
-      });
-    }).listen(8000);
-
-
-
-
 ## Writable Stream
 
 A `Writable Stream` has the following methods, members, and events.

lib/stream.js

@@ -7,55 +7,16 @@ function Stream() {
 util.inherits(Stream, events.EventEmitter);
 exports.Stream = Stream;
 
-Stream.prototype.pipe = function(dest /* options, filter */) {
+Stream.prototype.pipe = function(dest, options) {
   var source = this;
 
-  // parse arguments
-  var options, filter;
-  if (typeof arguments[1] == 'object') {
-    options = arguments[1];
-    filter = arguments[2];
-  } else {
-    filter = arguments[1];
-  }
-
   function ondata(chunk) {
-    // FIXME shouldn't need to test writable - this is working around bug.
-    // .writable should not change before a 'end' event is fired.
     if (dest.writable) {
       if (false === dest.write(chunk)) source.pause();
     }
   }
 
-  if (!filter) {
-    source.on('data', ondata);
-  } else {
-    //
-    // TODO: needs tests
-    //
-    var wait = false;
-    var waitQueue = [];
-
-    function done () {
-      wait = false;
-      // Drain the waitQueue
-      if (dest.writable && waitQueue.length) {
-        wait = true;
-        filter(waitQueue.shift(), ondata, done);
-      }
-    }
-
-    source.on('data', function (d) {
-      if (wait) {
-        waitQueue.push(d);
-        source.pause();
-      } else {
-        wait = true;
-        filter(d, ondata, done);
-      }
-    });
-  }
-
+  source.on('data', ondata);
 
   function ondrain() {
     if (source.readable) source.resume();