Data buffering in VT

app/assets/javascripts/player/vt.js.coffee

@@ -1,6 +1,7 @@
 class AsciiIo.VT
 
   constructor: (cols, lines, @renderer) ->
+    @data = ''
     @sb = new AsciiIo.ScreenBuffer(cols, lines)
 
     @fg = @bg = undefined
@@ -260,16 +261,18 @@ class AsciiIo.VT
     @COMPILED_PATTERNS = ([new RegExp("^" + re), f] for re, f of @PATTERNS)
 
   feed: (data) ->
-    while data.length > 0
+    @data += data
+
+    while @data.length > 0
       match = null
 
       for pattern in @COMPILED_PATTERNS
-        match = pattern[0].exec(data)
+        match = pattern[0].exec(@data)
 
         if match
           handler = pattern[1]
-          handler.call(this, data, match)
-          data = data.slice(match[0].length)
+          handler.call(this, @data, match)
+          @data = @data.slice(match[0].length)
           break
 
       break unless match
@@ -278,4 +281,4 @@ class AsciiIo.VT
     @renderer.render(changes, @sb.cursorX, @sb.cursorY)
     @sb.clearChanges()
 
-    data.length is 0
+    @data.length is 0

spec/javascripts/player/vt_spec.js.coffee

@@ -196,10 +196,6 @@ describe 'AsciiIo.VT', ->
         describe ']', ->
           # Operating system command
 
-          # beforeEach ->
-          #   vt = new AsciiIo.VT(cols, lines, renderer)
-            # vt.sb = {} # will throw 'undefined is not a function'
-
           describe '0;...BELL', ->
             beforeEach ->
               data += ']0;foobar\x07'
@@ -240,11 +236,11 @@ describe 'AsciiIo.VT', ->
           data += '['
 
         describe 'buffering', ->
-          # it 'allows parsing in chunks', ->
-          #   spyOn vt, 'handleSGR'
-          #   vt.feed(data)
-          #   vt.feed('m')
-          #   expect(vt.handleSGR).toHaveBeenCalled()
+          it 'allows parsing in chunks', ->
+            spyOn vt, 'handleSGR'
+            vt.feed(data)
+            vt.feed('m')
+            expect(vt.handleSGR).toHaveBeenCalled()
 
         describe '@', ->
           it 'calls reserveCharacters', ->