Created folder tt_ruby with a TreeTop's (very initial) version of Ruby

tt_ruby/ruby.rb

@@ -0,0 +1,63 @@
+require 'polyglot'
+require 'treetop'
+
+Treetop.load 'ruby'
+
+class NumberNode < Treetop::Runtime::SyntaxNode
+  def eval(context)
+    text_value.to_i
+  end
+end
+
+class StringNode < Treetop::Runtime::SyntaxNode
+  def eval(context)
+    text_value[1..-2]
+  end
+end
+
+class TrueNode < Treetop::Runtime::SyntaxNode
+  def eval(context)
+    true
+  end
+end
+
+class FalseNode < Treetop::Runtime::SyntaxNode
+  def eval(context)
+    false
+  end
+end
+
+class NilNode < Treetop::Runtime::SyntaxNode
+  def eval(context)
+    nil
+  end
+end
+
+class SelfNode < Treetop::Runtime::SyntaxNode
+  def eval(context)
+    context.current_self
+  end
+end
+
+class ExpressionsNode < Treetop::Runtime::SyntaxNode
+  def eval(context)
+    others.elements.inject(expression.eval(context)) { |memo, e| e.expression.eval(context) }
+  end
+end
+
+class AssignmentNode < Treetop::Runtime::SyntaxNode
+  def eval(context)
+    context.locals[identifier.eval(context)] = expression.eval(context)
+  end
+end
+
+class IdentifierNode < Treetop::Runtime::SyntaxNode
+  def eval(context)
+    text_value.to_sym
+  end
+end
+
+Context = Struct.new(:current_self, :locals)
+@context = Context.new(nil, {})
+
+@parser = RubyParser.new

tt_ruby/ruby.treetop

@@ -0,0 +1,81 @@
+grammar Ruby
+  rule root
+    expressions
+  end
+
+  rule expressions
+    expression others:(terminator expression)* <ExpressionsNode>
+  end
+
+  rule expression
+    literal
+    /
+    self
+    /
+    assignment
+  end
+
+  rule terminator
+    newline
+    /
+    ';'
+  end
+
+  rule newline
+    "\n"
+  end
+
+  rule literal
+    number
+    /
+    string
+    /
+    true
+    /
+    false
+    /
+    nil
+  end
+
+  rule number
+    '-'? [1-9] [0-9]* <NumberNode>
+  end
+
+  rule string
+    string_with_double_quotes
+    /
+    string_with_single_quotes
+  end
+
+  rule string_with_double_quotes
+    '"' (!'"' .)* '"' <StringNode>
+  end
+
+  rule string_with_single_quotes
+    "'" (!"'" .)* "'" <StringNode>
+  end
+
+  rule true
+    'true'  <TrueNode>
+  end
+
+  rule false
+    'false' <FalseNode>
+  end
+
+  rule nil
+    'nil'   <NilNode>
+  end
+
+  rule self
+    'self'  <SelfNode>
+  end
+
+  rule assignment
+    identifier '=' expression   <AssignmentNode>
+  end
+
+  rule identifier
+    [a-z] [a-zA-Z_]*    <IdentifierNode>
+  end
+end