Class: Fir::BackspaceCommand

Inherits:
KeyCommand show all
Defined in:
lib/fir/key_command/backspace_command.rb

Instance Attribute Summary

Attributes inherited from KeyCommand

#character, #state

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from KeyCommand

build, #execute, for, handles?, inherited, #initialize, register, registry

Constructor Details

This class inherits a constructor from Fir::KeyCommand

Class Method Details

.character_regex ⇒ Object 



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# File 'lib/fir/key_command/backspace_command.rb', line 8

def self.character_regex
  /^\177$/
end

Instance Method Details

#execute_hook(new_state) ⇒ Object 



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# File 'lib/fir/key_command/backspace_command.rb', line 12

def execute_hook(new_state)
  unless state.blank?
    if state.cursor.x.positive?
      new_state.cursor = state.cursor.left(1)
      new_line = state.current_line.clone
      new_line.delete_at(state.cursor.x - 1)
      new_state.current_line = new_line
    elsif state.cursor.x.zero? && state.cursor.y.positive?
      new_state.cursor =
        state.cursor.up.right(state.lines[state.cursor.y - 1].length)
      new_state.lines = state.lines.remove
    end
  end
  new_state
end