move to typed structure

on the way to removing the language, the at needs to be replaced with a
typed structure.

lib/soml/code/assignment.rb

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+module Soml
+  class Assignment < Statement
+    attr_accessor :name , :value
+  end
+end

lib/soml/code/basic_values.rb

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+module Soml
+  class IntegerExpression < Expression
+    attr_accessor :value
+    def initialize(value)
+      @value = value
+    end
+  end
+  class FloatExpression < Expression
+    attr_accessor :value
+    def initialize(value)
+      @value = value
+    end
+  end
+  class TrueExpression < Expression
+  end
+  class FalseExpression < Expression
+  end
+  class NilExpression < Expression
+  end
+  class StringExpression < Expression
+    attr_accessor :value
+    def initialize(value)
+      @value = value
+    end
+  end
+  class NameExpression < Expression
+    attr_accessor :value
+    def initialize(value)
+      @value = value
+    end
+  end
+  class ClassExpression < Expression
+    attr_accessor :value
+    def initialize(value)
+      @value = value
+    end
+  end
+end

lib/soml/code/call_site.rb

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+module Soml
+  class CallSite < Expression
+    attr_accessor :name , :receiver , :arguments
+  end
+end

lib/soml/code/code.rb

@@ -0,0 +1,25 @@
+
+# Base class for Expresssion and Statement
+module Soml
+
+  class Code
+
+  end
+
+  class Statement < Code
+  end
+  class Expression < Code
+  end
+
+end
+
+require_relative "while_statement"
+require_relative "if_statement"
+require_relative "return_statement"
+require_relative "statements"
+require_relative "operator_expression"
+require_relative "field_access"
+require_relative "call_site"
+require_relative "basic_values"
+require_relative "assignment"
+require_relative "to_code"

lib/soml/code/field_access.rb

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+module Soml
+  class FieldAccess < Expression
+    attr_accessor :receiver , :field
+  end
+end

lib/soml/code/if_statement.rb

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+module Soml
+  class IfStatement < Statement
+    attr_accessor :branch_type , :condition , :if_true , :if_false
+  end
+end

lib/soml/code/operator_expression.rb

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+module Soml
+  class OperatorExpression < Expression
+    attr_accessor :operator , :left_expression , :right_expression
+  end
+end

lib/soml/code/return_statement.rb

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+module Soml
+  class ReturnStatement < Statement
+    attr_accessor :return_value
+  end
+end

lib/soml/code/statements.rb

@@ -0,0 +1,5 @@
+module Soml
+  class Statements < Statement
+    attr_accessor :statements
+  end
+end

lib/soml/code/to_code.rb

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+module Soml
+
+  def self.ast_to_code statement
+    compiler = ToCode.new
+    compiler.process statement
+  end
+
+  class ToCode < AST::Processor
+
+    def on_while_statement statement
+      #puts statement.inspect
+      branch_type , condition , statements = *statement
+      w = WhileStatement.new()
+      w.branch_type = branch_type
+      w.condition = process(condition) #.first
+      w.statements = process_all(statements)
+      w
+    end
+
+    def on_if_statement statement
+      branch_type , condition , if_true , if_false = *statement
+      w = IfStatement.new()
+      w.branch_type = branch_type
+      w.condition = process(condition) #.first
+      w.if_true = process_all(if_true)
+      w.if_false = process_all(if_false)
+      w
+    end
+
+    def on_statements statement
+      w = Statements.new()
+      w.statements = process_all(statement.children)
+      w
+    end
+
+    def on_return statement
+      w = ReturnStatement.new()
+      w.return_value = process(statement.children.first)
+      w
+    end
+
+    def on_operator_value statement
+      operator , left_e , right_e = *statement
+      w = OperatorExpression.new()
+      w.operator = operator
+      w.left_expression = process(left_e)
+      w.right_expression = process(right_e)
+      w
+    end
+
+    def on_field_access statement
+      receiver_ast , field_ast = *statement
+      w = FieldAccess.new()
+      w.receiver = process(receiver_ast)
+      w.field = process(field_ast)
+      w
+    end
+
+    def on_receiver expression
+      process expression.children.first
+    end
+
+    def on_call statement
+      name_s , arguments , receiver = *statement
+      w = CallSite.new()
+      w.name = name_s
+      w.arguments = process(arguments)
+      w.receiver = process(receiver)
+      w
+    end
+
+    def on_int expression
+      IntegerExpression.new(expression.children.first)
+    end
+
+    def on_true expression
+      TrueExpression.new
+    end
+
+    def on_false expression
+      FalseExpression.new
+    end
+
+    def on_nil expression
+      NilExpression.new
+    end
+
+    def on_name statement
+      NameExpression.new(statement.children.first)
+    end
+    def on_string expression
+      StringExpression.new(expression.children.first)
+    end
+
+    def on_class_name expression
+      ClassExpression.new(expression.children.first)
+    end
+
+    def on_assignment statement
+      name , value = *statement
+      w = Assignment.new()
+      w.name = process name
+      w.value = process(value)
+      w
+    end
+
+  end
+end

lib/soml/code/while_statement.rb

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+module Soml
+  class WhileStatement < Statement
+    attr_accessor :branch_type , :condition , :statements
+  end
+end