diff --git a/.gitignore b/.gitignore
index 7847ea0..e19f199 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 npm-debug.log
 node_modules/*
 lib/
+tmp/
diff --git a/Makefile b/Makefile
index 54703ae..14ba05a 100644
--- a/Makefile
+++ b/Makefile
@@ -13,11 +13,11 @@ lib:
 lib/tumble.js: lib src/tumble.peg
 	./node_modules/.bin/pegjs src/tumble.peg lib/tumble.js
 
-$(lib_objects): lib lib/%.js: src/%.coffee
+$(lib_objects): $(lib_sources)
 	@mkdir -p $(@D)
 	coffee -o $(@D) -c $<
 
-test: test/[0-9]*_mocha.coffee lib/tumble.js
+test: test/[0-9]*_mocha.coffee lib/tumble.js lib/parser.js
 	./node_modules/.bin/mocha -R tap -C --compilers coffee:coffee-script -u tdd $<
 
 
diff --git a/src/parser.coffee b/src/parser.coffee
new file mode 100644
index 0000000..f2645d9
--- /dev/null
+++ b/src/parser.coffee
@@ -0,0 +1,63 @@
+_ = require 'underscore'
+util = require 'util'
+
+class Contexter
+
+    constructor: (@content) ->
+        @stack = [@content]
+        @templates = {}
+        @depth = 0
+
+    has_any: (name) ->
+        _.find this.stack, (o) -> _.has(o, name)
+
+    has_any_one: (name) ->
+        p = @has_any(name)
+        if p then p[name] else null
+
+    has: (name) ->
+        if @stack[0][name]? then @stack[0][name] else null
+
+    get: (name, alt = '') ->
+        p = @has_any_one(name)
+        if p and (_.isString(p) or _.isNumber(p)) then p else alt
+
+    once: (obj, cb) ->
+        @stack.unshift obj
+        r = cb this
+        @stack.shift()
+        r
+
+    if: (name, cb) ->
+        p = @has_any_one(name)
+        if p then cb(this) else ''
+
+    block: (name, cb) ->
+        p = @has_any_one(name)
+        if p and _.isObject(p) then @once(p, cb) else ''
+
+    many: (name, cb) ->
+        ps = @has(name)
+        if not (ps and _.isArray(ps))
+            return ""
+        (_.map ps, (p) => @once(p, cb)).join('')
+
+    templatize: (name, cb) ->
+        @templates[name] = cb
+        ""
+
+    render: (name) ->
+        if @templates[name]? and _.isfunction(@templates[name]) then @templates[name](@) else ""
+
+
+module.exports = (ast, data) ->
+    context = new Contexter(data)
+
+    cmd = (o) ->
+        switch o.unit
+            when 'variable' then  (context) -> context.get(o.name)
+            when 'text'     then  (context) -> o.content
+            when 'block'    then  (context) -> context[o.type] o.name, (context) ->
+                (cmd(p)(context) for p in o.content).join("")
+
+    (cmd(o)(context) for o in ast.content).join("")
diff --git a/src/tumble.peg b/src/tumble.peg
index a9388d0..422a5d2 100644
--- a/src/tumble.peg
+++ b/src/tumble.peg
@@ -2,7 +2,7 @@
 
 document
     = ps:part* 
-      { return ps; }
+      { return { unit: "block", name: "document", content: ps }; }
 
 part
     = block / variable / text
diff --git a/test/01_basics_mocha.coffee b/test/01_basics_mocha.coffee
index a4451ae..faa352f 100644
--- a/test/01_basics_mocha.coffee
+++ b/test/01_basics_mocha.coffee
@@ -5,6 +5,7 @@ should = chai.should()
 util   = require 'util'
 
 tumble = require('../lib/tumble').parse;
+parse = require('../lib/parser');
 
 test_data = [
     {
@@ -98,7 +99,7 @@ describe "Basic Functionality", ->
         do (data) ->
             it "should work with #{data.description}", ->
                 r = tumble(data.input)
-                r = r(data.data)
+                r = parse(r, data.data)
                 r.should.equal data.output
 
 describe "Check for recursion", ->
@@ -111,7 +112,8 @@ describe "Check for recursion", ->
     do (data) ->
         it "should catch an exception", ->
             try
-                r = tumble(data.input)(data.data)
+                r = tumble(data.input)
+                r = parse(r, data.data)
                 assert.ok false, "It did not throw the exception"
             catch err
-                assert.ok true, "Recursion depth exeception thrown."
+                assert.ok err.id == 'recursion-error', "Recursion depth exeception thrown."