delegate css method to page's parser

main.cr

@@ -4,6 +4,6 @@ agent = Mechanize.new
 agent.request_headers = HTTP::Headers{"Foo" => "Bar"}
 params = {"hoge" => "hoge"}
 page = agent.get("http://example.com/", params: params)
-#puts page.code
-#puts page.body
-puts page.parser.not_nil!.css("h1").first.inner_text
+puts page.code
+puts page.body
+puts page.css("h1").first.inner_text

src/mechanize/page.cr

@@ -2,13 +2,13 @@ require "myhtml"
 require "./file"
 
 class MechanizeCr::Page < MechanizeCr::File
+  delegate :css, to: parser
+
   def initialize(uri, response, body, code)
     super(uri, response, body, code)
   end
 
-  def parser
-    return @parser if @parser
-    return unless @body
-    @parser = Myhtml::Parser.new(@body)
+  def parser : Myhtml::Parser
+    @parser ||=  Myhtml::Parser.new(@body)
   end
 end