created own directory for parser

lib/parser/transform.rb

@@ -0,0 +1,33 @@
+require 'parslet'
+require 'vm/nodes'
+
+module Vm
+  class Transform < Parslet::Transform
+    rule(:number => simple(:value)) { NumberExpression.new(value.to_i) }
+    rule(:name   => simple(:name))  { NameExpression.new(name.to_s) }
+
+    rule(:arg  => simple(:arg))    { arg  }
+    rule(:args => sequence(:args)) { args }
+
+    rule(:funcall => simple(:funcall),
+         :args    => simple(:args))   { FuncallExpression.new(funcall.name, [args]) }
+
+    rule(:funcall => simple(:funcall),
+         :args    => sequence(:args)) { FuncallExpression.new(funcall.name, args) }
+
+    rule(:cond     => simple(:cond),
+         :if_true  => {:body => simple(:if_true)},
+         :if_false => {:body => simple(:if_false)}) { ConditionalExpression.new(cond, if_true, if_false) }
+
+    rule(:param  => simple(:param))    { param  }
+    rule(:params => sequence(:params)) { params }
+
+    rule(:func   => simple(:func),
+         :params => simple(:name),
+         :body   => simple(:body)) { FunctionExpression.new(func.name, [name], body) }
+
+    rule(:func   => simple(:func),
+         :params => sequence(:params),
+         :body   => simple(:body)) { FunctionExpression.new(func.name, params, body) }
+  end
+end