Remove @input from event example

Author: omarroth

examples/events/events.cr

@@ -16,5 +16,5 @@ OptionParser.parse! do |parser|
 end
 
 parser = Marpa::Parser.new
-events = Events.new(input)
+events = Events.new
 puts parser.parse(input, grammar, events: events)

examples/events/helpers.cr

@@ -1,8 +1,7 @@
 class Events < Marpa::Events
   property size
 
-  def initialize(input : String)
-    @input = input
+  def initialize
     @size = 0
   end
 
@@ -12,7 +11,7 @@ class Events < Marpa::Events
 
   def text(context)
     position = context.position
-    text = @input[position, @size]
+    text = context.input[position, @size]
 
     context.matches << {text, "text"}
   end

spec/marpa_spec.cr

@@ -66,7 +66,7 @@ describe Marpa do
     parser = Marpa::Parser.new
     grammar = File.read("examples/events/events.bnf")
     input = "S4()))))"
-    events = Events.new(input)
+    events = Events.new
 
     stack = parser.parse(input, grammar, events: events)