michaelfeathers · April 13, 2020 18:54 · Apr 13, 2020
diff --git a/c11r.rb b/c11r.rb
@@ -0,0 +1,132 @@
+
+class Command
+  def run line, session
+    return unless matches? line
+    process line, session
+  end
+end
+
+class FixView < Command
+  def matches? line
+    line.split == ["fix"]
+  end
+
+  def process line, session
+    session.fix
+  end
+end
+
+class FixNew < Command
+  def matches? line
+    line.split == ["fix","new"]
+  end
+
+  def process line, session
+    session.fix_new
+  end
+end
+
+class FixAdd < Command
+  def matches? line
+    line.split.take(2) == ["fix", "add"]
+  end
+
+  def process line, session
+    session.fix_add(line.split.drop(2).join(" "))
+  end
+end
+
+class FixRemove < Command
+  def matches? line
+    line.split.take(2) == ["fix", "remove"]
+  end
+
+  def process line, session
+    session.fix_remove
+  end
+end
+
+class Ask < Command
+  def matches? line
+    line.split.take(1) == ["ask"]
+  end
+
+  def process line, session
+    session.ask(line.split.drop(1).join(" "))
+  end
+end
+
+class Push < Command
+  def matches? line
+    tokens = line.split
+    tokens.count >= 2 && tokens[0] == "push"
+  end
+
+  def process line, session
+    session.push(line.split.drop(1).join(" "))
+  end
+end
+
+class C11R
+
+  @@commands = [FixNew.new, 
+     FixView.new, 
+     FixAdd.new, 
+     FixRemove.new,
+     Ask.new, 
+     Push.new]
+
+  def initialize
+    @session = Session.new
+  end
+
+  def run
+    ARGF.each_line {|li| on_line(li) }
+  end
+
+  def on_line line
+    @@commands.each {|c| c.run(line, @session) }
+  end
+end
+
+class Session
+  def initialize
+    @fix = []
+    @question = @answer = ""
+  end
+
+  def fix_new
+    @fix = []
+  end
+
+  def fix
+    puts @fix.join(";") 
+  end
+
+  def fix_add line
+    @fix << line
+  end
+
+  def fix_remove
+    @fix = @fix[0..-2]
+  end
+
+  def ask line
+    @question = line
+    @answer = eval [@fix, @question].join(";")
+    puts @answer
+    @answer
+  end
+
+  def push line
+    puts "test \"#{line}\""
+    puts "  assert_eq(#{@answer},#{@question}))"
+    puts "end"
+    @question = @answer = ""
+  end
+end
+
+
+C11R.new.run
+
+