Add templating feature

lib/document.coffee

@@ -10,7 +10,7 @@ PDFReference = require './reference'
 PDFPage = require './page'
 
 class PDFDocument
-    constructor: (@options = {}) ->
+    constructor: (@options = {}, temp) ->
         # PDF version
         @version = 1.3
 
@@ -43,6 +43,14 @@ class PDFDocument
             @info[key] = val for key, val of @options.info
             delete @options.info
 
+        @temp = @ref()
+
+        if (temp)
+            @store.objects[5].finalizedStream = temp.finalizedStream
+            @store.objects[5].data = temp.data
+            @haveTemp = true
+
+
         # Add the first page
         @addPage()
 
@@ -77,7 +85,11 @@ class PDFDocument
         @store.ref(data)
 
     addContent: (str) ->
-        @page.content.add str
+        if @isTemp is true
+            @temp.add str
+        else
+          @page.content.add str
+
         return this # make chaining possible
 
     write: (filename, callback) ->
@@ -115,14 +127,12 @@ class PDFDocument
 
     generateBody: (out) ->
         offset = out.join('\n').length
-
         for id, ref of @store.objects
             object = ref.object()
             ref.offset = offset
             out.push object
 
             offset += object.length + 1
-
         @xref_offset = offset
 
     generateXRef: (out) ->
@@ -149,5 +159,20 @@ class PDFDocument
 
     toString: ->
         "[object PDFDocument]"
+
+    haveTemp: false
+    isTemp: false
+
+    startTemp: ->
+        @haveTemp = true
+        @isTemp = true
+
+    endTemp: ->
+        @temp.finalize true
+        @isTemp = false
+
+    outputTemp: ->
+        delete @temp.stream
+        @temp
 
 module.exports = PDFDocument

lib/page.coffee

@@ -25,14 +25,19 @@ class PDFPage
         @height = dimensions[if @layout is 'portrait' then 1 else 0]
 
         # A reference to the content of this page
-        @content = @document.ref()        
-
+        @content = @document.ref()
+
+        if @document.haveTemp
+            contents = [@content, @document.temp] 
+        else 
+            contents =  @content
+
         # The page dictionary
         @dictionary = @document.ref
             Type: 'Page'
             Parent: @document.store.pages
             MediaBox: [0, 0, @width, @height]
-            Contents: @content
+            Contents: contents
 
         # The resource dictionary
         @dictionary.data['Resources'] = @document.ref

lib/reference.coffee

@@ -10,13 +10,12 @@ class PDFReference
         @gen = 0
         @stream = null
         @finalizedStream = null
-
     object: ->
         @finalize() if not @finalizedStream
         out = ["#{@id} #{@gen} obj"]
         out.push PDFObject.convert(@data)
 
-        if @stream
+        if @stream || @finalizedStream
             out.push "stream"
             out.push @finalizedStream
             out.push "endstream"

lib/store.coffee

@@ -23,8 +23,8 @@ class PDFObjectStore
     ref: (data) ->
         @push ++@length, data
 
-    push: (id, data) ->
-        ref = new PDFReference(id, data)
+    push: (id, data, fStream) ->
+        ref = new PDFReference id, data
         @objects[id] = ref
         return ref