Class: Landescape::Evaluator::Curses

Inherits:
Base
  • Object
show all
Defined in:
lib/landescape/evaluator/curses.rb

Constant Summary collapse

GRAPHICS_MODES = 
{
  1 => ::Curses::A_BOLD,
  4 => ::Curses::A_UNDERLINE,
  5 => ::Curses::A_BLINK,
  7 => ::Curses::A_REVERSE
}

Instance Attribute Summary collapse

Attributes inherited from Base

#statements

Instance Method Summary collapse

Methods inherited from Base

#not_supported, #start, start, #stop, #unknown

Constructor Details

#initialize(statements, window, options = {}) ⇒ Curses

Returns a new instance of Curses.



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# File 'lib/landescape/evaluator/curses.rb', line 16

def initialize(statements, window, options = {})
  super

  @saved_cursor  = nil
  @scroll_region = [0, window.maxy]
end

Instance Attribute Details

#window ⇒ Object (readonly)

Returns the value of attribute window.



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# File 'lib/landescape/evaluator/curses.rb', line 14

def window
  @window
end

Instance Method Details

#carriage_return ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 69

def carriage_return
  cursor_address window.cury, 0
end

#change_scroll_region(top, bottom) ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 43

def change_scroll_region(top, bottom)
  @scroll_region = [top, bottom]

  window.setscrreg *@scroll_region
end

#clear_eol ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 120

def clear_eol
  window.clrtoeol

  window.refresh
end

#clear_screen ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 113

def clear_screen
  cursor_address 0, 0

  window.clear
  window.refresh
end

#cursor_address(line, column) ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 57

def cursor_address(line, column)
  scroll_forward if line > window.cury && window.maxy.pred <= window.cury

  window.setpos line, column
end

#cursor_down(step) ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 77

def cursor_down(step)
  cursor_address (window.cury + step), window.curx
end

#cursor_invisible ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 101

def cursor_invisible
  window.curs_set 0
end

#cursor_left(step) ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 85

def cursor_left(step)
  cursor_address window.cury, (window.curx - step)
end

#cursor_right(step) ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 81

def cursor_right(step)
  cursor_address window.cury, (window.curx + step)
end

#cursor_up(step) ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 73

def cursor_up(step)
  cursor_address (window.cury - step), window.curx
end

#cursor_visible ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 97

def cursor_visible
  window.curs_set 2
end

#exit_attribute_mode ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 39

def exit_attribute_mode
  window.attroff GRAPHICS_MODES.values.inject(:|)
end

#keypad_local ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 109

def keypad_local
  window.keypad false
end

#keypad_xmit ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 105

def keypad_xmit
  window.keypad true
end

#newline ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 63

def newline
  scroll_forward if window.cury == @scroll_region.last

  cursor_address (window.cury.succ), 0
end

#print(str) ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 23

def print(str)
  window.addstr str

  window.refresh
end

#restore_cursor ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 93

def restore_cursor
  cursor_address *@saved_cursor
end

#save_cursor ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 89

def save_cursor
  @saved_cursor = [window.cury, window.curx]
end

#scroll_forward ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 53

def scroll_forward
  window.scrl 1
end

#scroll_reverse ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 49

def scroll_reverse
  window.scrl -1
end

#set_attributes(*modes) ⇒ Object 



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# File 'lib/landescape/evaluator/curses.rb', line 29

def set_attributes(*modes)
  return exit_attribute_mode if modes.empty?

  modes.each do |mode|
    next unless attr = GRAPHICS_MODES[mode]

    window.attron attr
  end
end