Class: ActionPolicy::PrettyPrint::Visitor

Inherits:
Object
  • Object
show all
Defined in:
lib/action_policy/utils/pretty_print.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(object) ⇒ Visitor

Returns a new instance of Visitor.



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# File 'lib/action_policy/utils/pretty_print.rb', line 47

def initialize(object)
  @object = object
end

Instance Attribute Details

#indent ⇒ Object

Returns the value of attribute indent.



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# File 'lib/action_policy/utils/pretty_print.rb', line 45

def indent
  @indent
end

#lines ⇒ Object (readonly)

Returns the value of attribute lines.



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# File 'lib/action_policy/utils/pretty_print.rb', line 44

def lines
  @lines
end

#object ⇒ Object (readonly)

Returns the value of attribute object.



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# File 'lib/action_policy/utils/pretty_print.rb', line 44

def object
  @object
end

#source ⇒ Object (readonly)

Returns the value of attribute source.



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# File 'lib/action_policy/utils/pretty_print.rb', line 44

def source
  @source
end

Instance Method Details

#collect(ast) ⇒ Object 



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# File 'lib/action_policy/utils/pretty_print.rb', line 51

def collect(ast)
  @lines = []
  @indent = 0
  @source = ast.source.source
  ast = ast.value.child_nodes[0].child_nodes[0].body

  visit_node(ast)

  lines.join("\n")
end

#eval_exp(exp) ⇒ Object 



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# File 'lib/action_policy/utils/pretty_print.rb', line 75

def eval_exp(exp)
  return "<skipped>" if ignore_exp?(exp)
  object.instance_eval(exp)
rescue => e
  "Failed: #{e.message}"
end

#expression_with_result(sexp) ⇒ Object 



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# File 'lib/action_policy/utils/pretty_print.rb', line 70

def expression_with_result(sexp)
  expression = source[sexp.location.start_offset...sexp.location.end_offset]
  "#{expression} #=> #{PrettyPrint.colorize(eval_exp(expression))}"
end

#ignore_exp?(exp) ⇒ Boolean

Some lines should not be evaled

Returns:

  • (Boolean) 


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# File 'lib/action_policy/utils/pretty_print.rb', line 121

def ignore_exp?(exp)
  PrettyPrint.ignore_expressions.any? { exp.match?(_1) }
end

#indented(str) ⇒ Object 



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# File 'lib/action_policy/utils/pretty_print.rb', line 113

def indented(str)
  "#{indent.zero? ? "↳ " : ""}#{" " * indent}#{str}".tap do
    # increase indent after the first expression
    self.indent += 2 if indent.zero?
  end
end

#visit_and_node(ast) ⇒ Object 



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# File 'lib/action_policy/utils/pretty_print.rb', line 82

def visit_and_node(ast)
  visit_node(ast.left)
  lines << indented("AND")
  visit_node(ast.right)
end

#visit_missing(ast) ⇒ Object 



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# File 'lib/action_policy/utils/pretty_print.rb', line 109

def visit_missing(ast)
  lines << indented(expression_with_result(ast))
end

#visit_node(ast) ⇒ Object 



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# File 'lib/action_policy/utils/pretty_print.rb', line 62

def visit_node(ast)
  if respond_to?("visit_#{ast.type}")
    send("visit_#{ast.type}", ast)
  else
    visit_missing ast
  end
end

#visit_or_node(ast) ⇒ Object 



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# File 'lib/action_policy/utils/pretty_print.rb', line 88

def visit_or_node(ast)
  visit_node(ast.left)
  lines << indented("OR")
  visit_node(ast.right)
end

#visit_parentheses_node(ast) ⇒ Object 



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# File 'lib/action_policy/utils/pretty_print.rb', line 102

def visit_parentheses_node(ast)
  lines << indented("(")
  self.indent += 2
  visit_node(ast.child_nodes[0])
  lines << indented(")")
end

#visit_statements_node(ast) ⇒ Object 



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# File 'lib/action_policy/utils/pretty_print.rb', line 94

def visit_statements_node(ast)
  ast.child_nodes.each do |node|
    visit_node(node)
    # restore indent after each expression
    self.indent -= 2
  end
end