Class: Termular::UI

Inherits:
Object
  • Object
show all
Defined in:
lib/termular/ui.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ UI

Returns a new instance of UI.



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# File 'lib/termular/ui.rb', line 167

def initialize
  @cursor_offset = 0
  @expression = ""
end

Instance Attribute Details

#current_command ⇒ Object

Returns the value of attribute current_command.



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# File 'lib/termular/ui.rb', line 3

def current_command
  @current_command
end

#current_graph ⇒ Object

Returns the value of attribute current_graph.



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# File 'lib/termular/ui.rb', line 3

def current_graph
  @current_graph
end

#cursor_offset ⇒ Object

Returns the value of attribute cursor_offset.



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# File 'lib/termular/ui.rb', line 3

def cursor_offset
  @cursor_offset
end

#expression ⇒ Object

Returns the value of attribute expression.



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# File 'lib/termular/ui.rb', line 3

def expression
  @expression
end

#insert_mode ⇒ Object

Returns the value of attribute insert_mode.



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# File 'lib/termular/ui.rb', line 3

def insert_mode
  @insert_mode
end

#invalidate_next ⇒ Object

Returns the value of attribute invalidate_next.



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# File 'lib/termular/ui.rb', line 3

def invalidate_next
  @invalidate_next
end

Instance Method Details

#dispatch_insert_keypress(k) ⇒ Object 



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# File 'lib/termular/ui.rb', line 74

def dispatch_insert_keypress(k)
  case k[0].ord
  when 127 # backspace
    unless cursor_offset.zero?
      @cursor_offset -= 1
      expression[cursor_offset..cursor_offset] = ""
    end
  when 10 # enter
    begin
      @current_command = Parser.parse! expression
      if current_command.is_a? AST::CartesianCommand
        @current_graph = Graph::Cartesian.new current_command.expression
        @needs_tick = expression =~ /time/
      elsif current_command.is_a? AST::ImplicitCartesianCommand
        @current_graph = Graph::ImplicitCartesian.new current_command.relation
        @needs_tick = expression =~ /time/
      elsif current_command.is_a? AST::PolarCommand
        @current_graph = Graph::Polar.new current_command.expression
        @needs_tick = expression =~ /time/
      elsif current_command.is_a? AST::ImplicitPolarCommand
        @current_graph = Graph::ImplicitPolar.new current_command.relation
        @needs_tick = expression =~ /time/
      elsif current_command.is_a? AST::OptionCommand
        if current_graph
          current_graph.options[current_command.option] = current_command.expression.eval(Context.global)
          current_graph.invalidate
        end
      elsif current_command.is_a? AST::QuitCommand
        exit
      end
    rescue => e
      show_exception "#{e.class.name} #{e.message}"
    end
  when 27 # special key
    if k == "\e"
      # legit escape
      @insert_mode = false
      return
    end
    case k[1..-1]
    when "OH" # home
      @cursor_offset = 0
    when "OF" # end
      @cursor_offset = expression.length
    when "OD" # arrow left
      @cursor_offset -= 1 unless cursor_offset.zero?
    when "OC" # arrow right
      @cursor_offset += 1 unless cursor_offset == expression.length
    when "[3~"  
      expression[cursor_offset..cursor_offset] = ""
    else
#          print k.each_byte.to_a.join ","
#          raise k[1..-1]#k.each_byte.to_a.join ","
    end
  when 0x20..0x7E
#        expression << k.ord.to_s << " "
    expression[cursor_offset, 0] = k
    @cursor_offset += 1
  end
end

#dispatch_keypress(k) ⇒ Object 



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# File 'lib/termular/ui.rb', line 25

def dispatch_keypress(k)
  if invalidate_next
    current_graph and current_graph.invalidate
    @invalidate_next = false
  end
  return dispatch_insert_keypress k if insert_mode
  case k[0]
  when "h" # move left
    current_graph.pan -0.2, 0
  when "H"
    current_graph.pan -0.05, 0
  when "l" # move right
    current_graph.pan 0.2, 0
  when "L"
    current_graph.pan 0.05, 0
  when "j" # move down
    current_graph.pan 0, -0.2
  when "J"
    current_graph.pan 0, -0.05
  when "k" # move up
    current_graph.pan 0, 0.2
  when "K"
    current_graph.pan 0, 0.05
  when " " # center
    current_graph.center
  when "]" # zoom in
    current_graph.zoom 2
  when "[" # zoom out
    current_graph.zoom 0.5
  when "i"
    @insert_mode = true
  when ":"
    @insert_mode = true
    @expression = ":"
    @cursor_offset = 1
  when "o"
    @insert_mode = true
    @expression = ""
    @cursor_offset = 0
  else
    print Console.move 0, 0
    print k.ord
  end

  #print Termular::Console.move 0, Termular::Console.rows
  #print c.ord
  exit if k[0] == "\3"
end

#draw_status_line ⇒ Object 



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# File 'lib/termular/ui.rb', line 5

def draw_status_line
  Console.buffered_print do |s|
    s <<  Console.move(0, Console.rows) <<
          Console.clear_line <<
          Console.color(:black, :white) <<
          (" " * Console.cols) <<
          Console.move(0, Console.rows) <<
          expression
    if insert_mode
      msg = "--INSERT--"
      s <<  Console.move(Console.cols - msg.length + 1, Console.rows) << 
            Console.color(:black, :white) << msg <<
            Console.move(cursor_offset + 1, Console.rows)
    else
      s << Console.move(Console.cols, Console.rows)
    end
    s << Console.reset
  end
end

#needs_tick? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/termular/ui.rb', line 163

def needs_tick?
  @needs_tick
end

#render ⇒ Object 



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# File 'lib/termular/ui.rb', line 148

def render
  Console.clear
  begin
    current_graph.render if current_graph and current_graph.needs_redraw
  rescue => e
    show_exception e.message
  end
  draw_status_line
end

#show_exception(msg) ⇒ Object 



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# File 'lib/termular/ui.rb', line 135

def show_exception(msg)
  Console.buffered_print do |s|
    s <<  Console.move(0, Console.rows - 1) <<
          Console.color(:bright, :white, :red) <<
          msg <<
          Console.reset
  end
  # this writes over where the graph goes, so invalidate it
  # however if we invalidate it now, it gets immediately dismissed, so set
  # a special flag
  @invalidate_next = true
end

#tick ⇒ Object 



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# File 'lib/termular/ui.rb', line 158

def tick
  current_graph and current_graph.invalidate
  render
end