Class: VER::Keymap

Inherits:
Struct
  • Object
show all
Includes:
Results
Defined in:
lib/ver/keymap.rb

Defined Under Namespace

Modules: Results Classes: MapHash

Constant Summary collapse

MERGER = 
proc{|key, v1, v2|
  if v1.respond_to?(:merge) && v2.respond_to?(:merge)
    v1.merge(v2, &MERGER)
  else
    v2
  end
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(keymap = MapHash.new, keys = Set.new) ⇒ Keymap

Returns a new instance of Keymap.



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# File 'lib/ver/keymap.rb', line 69

def initialize(keymap = MapHash.new, keys = Set.new)
  self.keymap = keymap
  self.keys = keys
end

Instance Attribute Details

#keymap ⇒ Object

Returns the value of attribute keymap

Returns:

  • (Object) —

    the current value of keymap



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# File 'lib/ver/keymap.rb', line 4

def keymap
  @keymap
end

#keys ⇒ Object

Returns the value of attribute keys

Returns:

  • (Object) —

    the current value of keys



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# File 'lib/ver/keymap.rb', line 4

def keys
  @keys
end

Instance Method Details

#[](*sequence) ⇒ Object 



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# File 'lib/ver/keymap.rb', line 96

def [](*sequence)
  sequence = [*sequence].flatten
  remaining = sequence.dup

  current = keymap
  while key = remaining.shift
    previous = current

    if current.key?(key)
      current = current[key]
      break unless current.respond_to?(:key?)
    else
      current.find do |ckey, cvalue|
        next unless ckey.is_a?(Symbol)

        case resolved = MinorMode[ckey].resolve([key, *remaining])
        when Incomplete
          return resolved
        when Impossible
          false
        else
          return cvalue.combine(resolved.last)
        end
      end

      return Impossible.new(sequence)
    end
  end

  case current
  when MapHash # incomplete
    Incomplete.new(sequence, current)
  else
    current
  end
end

#[]=(*sequence, action) ⇒ Object 



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# File 'lib/ver/keymap.rb', line 74

def []=(*sequence, action)
  sequence = [*sequence].flatten
  top = sub = MapHash.new

  while key = sequence.shift
    if key.respond_to?(:to_str)
      canonical = key_to_canonical(key.to_str)
      self.keys << canonical
    else
      canonical = key
    end

    if sequence.empty?
      sub[canonical] = action
    else
      sub = sub[canonical] = MapHash.new
    end
  end

  keymap.replace(keymap.merge(top, &MERGER))
end

#actions ⇒ Object 



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# File 'lib/ver/keymap.rb', line 144

def actions
  keymap.deep_each.map{|key, value| value }
end

#key_to_canonical(key) ⇒ Object 



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# File 'lib/ver/keymap.rb', line 148

def key_to_canonical(key)
  case key
  when /^[a-zA-Z0-9]$/
    key
  when /^</
    key
  else
    "<#{key}>"
  end
end

#merge(keymap) ⇒ Object 



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# File 'lib/ver/keymap.rb', line 133

def merge(keymap)
  merged = keymap.keymap.merge(self.keymap, &MERGER)
  self.class.new(merged, keys + keymap.keys)
end

#merge!(keymap) ⇒ Object 



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# File 'lib/ver/keymap.rb', line 138

def merge!(keymap)
  self.keymap = keymap.keymap.merge(self.keymap, &MERGER)
  self.keys += keymap.keys
  keymap
end