require 'spec_helper'
require 'stringio'

describe EDN do
  include RantlyHelpers

  ExemplarPattern = "#{File.dirname(__FILE__)}/exemplars/*.edn"

  context 'Exemplar' do
    edn_files = Dir[ExemplarPattern]
    edn_files.each do |edn_file|
      rb_file = edn_file.sub(/\.edn$/, '.rb')
      it "reads file #{File.basename(edn_file)} correctly" do
        expected = eval(File.read(rb_file))
        actual = EDN.read(File.read(edn_file))
        actual.should == expected
      end

       it "round trips the value in #{File.basename(edn_file)} correctly" do
        expected = eval(File.read(rb_file))
        actual = EDN.read(File.read(edn_file))
        round_trip = EDN.read(actual.to_edn)
        round_trip.should == expected
      end
    end
  end


  context "#read" do
    #it "reads from a stream" do
    #  io = StringIO.new("123")
    #  EDN.read(io).should == 123
    #end

    #it "reads mutiple values from a stream" do
    #  io = StringIO.new("123 456 789")
    #  EDN.read(io).should == 123
    #  EDN.read(io).should == 456
    #  EDN.read(io).should == 789
    #end

    it "raises an exception on eof by default" do
      expect { EDN.read('') }.to raise_error
    end

    #it "allows you to specify an eof value" do
    #  io = StringIO.new("123 456")
    #  EDN.read(io, :my_eof).should == 123
    #  EDN.read(io, :my_eof).should == 456
    #  EDN.read(io, :my_eof).should == :my_eof
    #end

    it "allows you to specify nil as an eof value" do
      EDN.read("", nil).should == nil
    end
  end

  context "reading data" do
    it "treats carriage returns like whitespace" do
      EDN.read("\r\n[\r\n]\r\n").should == []
      EDN.read("\r[\r]\r\r").should == []
    end

    it "reads any valid element" do
      elements = rant(RantlyHelpers::ELEMENT)
      elements.each do |element|
        begin
          if element == "nil"
            EDN.read(element).should be_nil
          else
            EDN.read(element).should_not be_nil
          end
        rescue Exception => ex
          puts "Bad element: #{element}"
          raise ex
        end
      end
    end
  end

  context "#register" do
    it "uses the identity function when no handler is given" do
      EDN.register "some/tag"
      EDN.read("#some/tag {}").class.should == Hash
    end
  end

  context "writing" do
    it "writes any valid element" do
      elements = rant(RantlyHelpers::ELEMENT)
      elements.each do |element|
        expect {
          begin
            EDN.read(element).to_edn
          rescue Exception => ex
            puts "Bad element: #{element}"
            raise ex
          end
        }.to_not raise_error
      end
    end

    it "writes equivalent edn to what it reads" do
      elements = rant(RantlyHelpers::ELEMENT)
      elements.each do |element|
        ruby_element = EDN.read(element)
        ruby_element.should == EDN.read(ruby_element.to_edn)
        if ruby_element.respond_to?(:metadata)
          ruby_element.metadata.should == EDN.read(ruby_element.to_edn).metadata
        end
      end
    end
  end
end