starting to deompose the parser

lib/crystal.rb

@@ -2,7 +2,7 @@ require 'parslet'
 
 require "asm/program"
 require "elf/object_writer"
-require 'parser/parser'
+require 'parser/composed'
 require 'parser/transform'
 require 'vm/nodes'
 

lib/parser/basic_types.rb

@@ -0,0 +1,9 @@
+module Parser
+  module BasicTypes
+    include Parslet
+    rule(:space)  { match('\s').repeat(1) }
+    rule(:space?) { space.maybe }
+    rule(:name)   { match('[a-z]').repeat(1).as(:name) >> space? }
+    rule(:number) { match('[0-9]').repeat(1).as(:number) >> space? }
+  end
+end

lib/parser/composed.rb

@@ -1,10 +1,8 @@
+require_relative "basic_types"
 
 module Parser
-  class Parser < Parslet::Parser
-    rule(:name)   { match('[a-z]').repeat(1).as(:name) >> space? }
-    rule(:number) { match('[0-9]').repeat(1).as(:number) >> space? }
-    rule(:space)  { match('\s').repeat(1) }
-    rule(:space?) { space.maybe }
+  class Composed < Parslet::Parser
+    include BasicTypes
 
     rule(:args) {
       lparen >>

lib/parser/transform.rb

@@ -29,5 +29,13 @@ module Parser
     rule(:func   => simple(:func),
          :params => sequence(:params),
          :body   => simple(:body)) { Vm::FunctionExpression.new(func.name, params, body) }
+    
+    #shortcut to get the ast tree for a given string
+    # optional second arguement specifies a rule that will be parsed (mainly for testing)     
+    def self.ast string , rule = :root
+      syntax    = Parser.new.send(rule).parse(string)
+      tree      = Transform.new.apply(syntax)
+      tree
+    end
   end
 end

test/test_nodes.rb

@@ -7,7 +7,7 @@ require_relative "helper"
 class TestNodes < MiniTest::Test
 
   def setup
-    @parser    = Parser::Parser.new
+    @parser    = Parser::Composed.new
     @transform = Parser::Transform.new
   end
   

test/test_parser.rb

@@ -3,7 +3,7 @@ require_relative 'helper'
 class ParserTest < MiniTest::Test
 
   def setup
-    @parser = Parser::Parser.new
+    @parser = Parser::Composed.new
   end
 
   def check