Class: Textbringer::Keymap

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/textbringer/keymap.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Keymap

Returns a new instance of Keymap.



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# File 'lib/textbringer/keymap.rb', line 13

def initialize
  @map = {}
end

Class Method Details

.key_name(key) ⇒ Object 



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# File 'lib/textbringer/keymap.rb', line 63

def self.key_name(key)
  case key
  when Symbol
    "<#{key}>"
  when " "
    "SPC"
  when "\t"
    "TAB"
  when "\e"
    "ESC"
  when "\C-m"
    "RET"
  when /\A[\0-\x1f\x7f]\z/
    "C-" + (key.ord ^ 0x40).chr.downcase
  else
    key.to_s
  end
end

.key_sequence_string(key_sequence) ⇒ Object 



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# File 'lib/textbringer/keymap.rb', line 82

def self.key_sequence_string(key_sequence)
  ks = key_sequence.dup
  key_names = []
  while key = ks.shift
    if key == "\e" && !ks.empty?
      key_names.push("M-" + key_name(ks.shift))
    else
      key_names.push(key_name(key))
    end
  end
  key_names.join(" ")
end

Instance Method Details

#define_key(key, command) ⇒ Object Also known as: [] 



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# File 'lib/textbringer/keymap.rb', line 17

def define_key(key, command)
  key_sequence = kbd(key)

  case key_sequence.size
  when 0
    raise ArgumentError, "Empty key"
  when 1
    @map[key_sequence.first] = command
  else
    k, *ks = key_sequence
    (@map[k] ||= Keymap.new).define_key(ks, command)
  end
end

#each(prefixes = [], &block) ⇒ Object 



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# File 'lib/textbringer/keymap.rb', line 49

def each(prefixes = [], &block)
  @map.each do |key, val|
    if val.is_a?(Keymap)
      val.each([*prefixes, key], &block)
    else
      yield([*prefixes, key], val)
    end
  end
end

#handle_undefined_key ⇒ Object 



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# File 'lib/textbringer/keymap.rb', line 59

def handle_undefined_key
  @map.default_proc = Proc.new { |h, k| yield(k) }
end

#lookup(key_sequence) ⇒ Object 



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# File 'lib/textbringer/keymap.rb', line 32

def lookup(key_sequence)
  case key_sequence.size
  when 0
    raise ArgumentError, "Empty key"
  when 1
    @map[key_sequence.first]
  else
    k, *ks = key_sequence
    km = @map[k]
    if km.is_a?(Keymap)
      km.lookup(ks)
    else
      nil
    end
  end
end