Class: EvalHook::TreeProcessor

Inherits:
SexpProcessor
  • Object
show all
Defined in:
lib/evalhook/tree_processor.rb

Instance Method Summary collapse

Constructor Details

#initialize(hook_handler) ⇒ TreeProcessor

Returns a new instance of TreeProcessor.



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# File 'lib/evalhook/tree_processor.rb', line 29

def initialize(hook_handler)
  super()
  @hook_handler = hook_handler
  @def_scope = Array.new
  self.require_empty = false
end

Instance Method Details

#class_scope(class_name) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 162

def class_scope(class_name)
  @def_scope.push(class_name)
  ret = yield
  @def_scope.pop
  ret
end

#const_path_emul(code) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 36

def const_path_emul(code)
  if code.instance_of? Array
    if (code.size == 1)
      s(:const, code[-1].to_sym)
    else
      s(:colon2, const_path_emul(code[0..-2]), code[-1].to_sym)
    end
  else
    const_path_emul code.split("::")
  end
end

#hook_handler_reference ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 48

def hook_handler_reference
  # create a global_variable name
  unless @hh_ref_global_name
    global_variable_name = "$hook_handler_" + rand(10000000000).to_s
    eval("#{global_variable_name} = @hook_handler")

    @hh_ref_global_name = global_variable_name.to_sym
  end

  s(:gvar, @hh_ref_global_name)
end

#process_call(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 68

def process_call(tree)
  original_receiver = tree[1]

  receiver = if original_receiver
    s(:call, hook_handler_reference, :private_method_check, s(:arglist,process(original_receiver),s(:lit,tree[2])))
  else
    s(:self)
  end

  firstcall = nil
  if tree[3] == s(:arglist) or tree[3] == nil
    firstcall = s(:call,
        hook_handler_reference,
        :hooked_variable_method,
        s(:arglist, receiver, s(:lit, tree[2]), s(:call, nil, :binding, s(:arglist)))
        )
  else
    firstcall = s(:call,
        hook_handler_reference,
        :hooked_method,
        s(:arglist, receiver, s(:lit, tree[2]))
        )
  end

  arglist = s(:arglist)
  if tree[3]
    if tree[3][0] == :arglist
      arglist = tree[3]
    else
      tree[3..-1].each do |st|
        arglist << st
      end
    end
  end

  s(:call, firstcall, :call, process(arglist) || s(:arglist))
end

#process_cdecl(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 106

def process_cdecl(tree)

      const_tree = tree[1]
      value_tree = tree[2]

      base_class_tree = nil
      const_id = nil

      unless const_tree.instance_of? Symbol
        if const_tree[0] == :colon2
          base_class_tree = const_tree[1]
          const_id = const_tree[2]
        elsif const_tree[0] == :colon3
          base_class_tree = s(:lit, Object)
          const_id = const_tree[1]
        end
      else
        base_class_tree = s(:lit, Object)
        const_id = const_tree
      end

      args1 = s(:arglist, base_class_tree, s(:lit, const_id), process(value_tree))

      s(:call, hook_handler_reference, :hooked_cdecl, args1 )
end

#process_class(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 169

def process_class(tree)
  class_name_tree = tree[1]
  if class_name_tree.instance_of? Sexp
    if class_name_tree.first == :colon3
      class_name_tree = process_colon3(class_name_tree)
    end
  end

  if tree[2]
    class_scope(tree[1]) do
      class_tree = s(:class, class_name_tree, process(tree[2]))
      tree[3..-1].map(&method(:process)).each(&class_tree.method(:<<))
      class_tree
    end
  else
    class_scope(tree[1]) do
      class_tree = s(:class, class_name_tree, nil)
      tree[3..-1].map(&method(:process)).each(&class_tree.method(:<<))
      class_tree
    end
  end
end

#process_colon2(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 192

def process_colon2(tree)
  name = tree[2].to_s
  args = s(:arglist, process(tree[1]), s(:str, name))
  s(:call, hook_handler_reference, :hooked_colon2, args)
end

#process_colon3(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 198

def process_colon3(tree)
  if @hook_handler.base_namespace
    s(:colon2, const_path_emul(@hook_handler.base_namespace.to_s), tree[1])
  else
    s(:colon3, tree[1])
  end
end

#process_const(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 213

def process_const(tree)
  name = tree[1].to_s
  args = s(:arglist, s(:str, name))
  s(:call, hook_handler_reference, :hooked_const, args)
end

#process_defn(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 219

def process_defn(tree)
  @last_args = tree[2]
  @last_method_name = tree[1]

  s(tree[0],tree[1],tree[2],process(tree[3]))
end

#process_defs(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 256

def process_defs(tree)
  block_tree = class_scope( "" ) {
    process(tree[4])
  }
  s(:defs, process(tree[1]), tree[2], tree[3], block_tree)
end

#process_dxstr(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 132

def process_dxstr(tree)
   dstr_tree = tree.dup
   dstr_tree[0] = :dstr

   args = s(:arglist, process(dstr_tree) )
   s(:call, hook_handler_reference, :hooked_xstr, args)
end

#process_gasgn(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 60

def process_gasgn(tree)

  args1 = s(:arglist, s(:lit, tree[1]), process(tree[2]))

  s(:call, hook_handler_reference, :hooked_gasgn, args1)
end

#process_gvar(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 206

def process_gvar(tree)
  name = tree[1]

  args = s(:arglist, s(:lit, name))
  s(:call, hook_handler_reference, :hooked_gvar, args)
end

#process_module(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 145

def process_module(tree)
  module_name_tree = tree[1]
  if module_name_tree.instance_of? Sexp
    if module_name_tree.first == :colon3
      module_name_tree = process_colon3(module_name_tree)
    end
  end

  class_scope(nil) {
    module_tree = s(:module, module_name_tree)
    tree[2..-1].each do |subtree|
      module_tree << process(subtree)
    end
    module_tree
  }
end

#process_super(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 244

def process_super(tree)

      receiver = s(:self)

      firstcall = s(:call, hook_handler_reference,
            :hooked_method,
            s(:arglist, receiver, s(:lit,@last_method_name), superclass_call_tree))

      # pass the args passed to super
      s(:call, firstcall, :call, process(s(:arglist, *tree[1..-1])))
end

#process_xstr(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 140

def process_xstr(tree)
  args = s(:arglist, s(:lit, tree[1]) )
  s(:call, hook_handler_reference, :hooked_xstr, args)
end

#process_zsuper(tree) ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 263

def process_zsuper(tree)

      receiver = s(:self)

      firstcall = s(:call, hook_handler_reference,
            :hooked_method,
            s(:arglist, receiver, s(:lit,@last_method_name), superclass_call_tree))

      # pass the args of the current defn
      args = s(:arglist)
      @last_args[1..-1].each do |arg_sym|
        if arg_sym.to_s[0] == "*"
          args << s(:splat, s(:lvar, arg_sym.to_s[1..-1].to_sym))
        else
          args << s(:lvar, arg_sym)
        end
      end

      s(:call, firstcall, :call, args)
end

#superclass_call_tree ⇒ Object 



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# File 'lib/evalhook/tree_processor.rb', line 226

def superclass_call_tree
  current_class_call = nil

  def_class = @def_scope.last
  if def_class.instance_of? Symbol
    current_class_call = s(:const, def_class)
    s(:call, current_class_call, :superclass, s(:arglist))
  elsif def_class.instance_of? Sexp
    current_class_call = def_class
    s(:call, current_class_call, :superclass, s(:arglist))
  elsif def_class.instance_of? String
    s(:call, s(:self), :class, s(:arglist))
  else
    current_class_call = s(:call, nil, :raise, s(:arglist, s(:const, :SecurityError)))
    s(:call, current_class_call, :superclass, s(:arglist))
  end
end