Class: VER::Mode

Inherits:
Object
  • Object
show all
Defined in:
lib/ver/mode.rb

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

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, callback) ⇒ Mode

Returns a new instance of Mode.



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# File 'lib/ver/mode.rb', line 17

def initialize(name, callback)
  @name, @callback = name, callback
  @stack = []
  @map = {}
  @ancestors = []
  @missing = nil
  @arguments = true
end

Instance Attribute Details

#arguments ⇒ Object

Returns the value of attribute arguments.



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# File 'lib/ver/mode.rb', line 11

def arguments
  @arguments
end

#callback ⇒ Object

Returns the value of attribute callback.



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# File 'lib/ver/mode.rb', line 11

def callback
  @callback
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/ver/mode.rb', line 11

def name
  @name
end

Class Method Details

.split_stack(stack) ⇒ Object 



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# File 'lib/ver/mode.rb', line 190

def self.split_stack(stack)
  first = stack[0]
  return stack, nil if first == '0' || first == '<KeyPress-0>'

  pivot = stack.index{|c| c !~ /^(<KeyPress-\d+>|\d+)$/ }

  if pivot == 0
    return stack, nil
  elsif pivot
    keys, args = stack[pivot..-1], stack[0..pivot]
    return keys, args.join.scan(/\d+/).join.to_i
  else
    return [], stack.join.to_i
  end
end

Instance Method Details

#ancestors(*done) {|_self| ... } ⇒ Object

Yields:

  • (_self)

Yield Parameters:

  • _self (VER::Mode) —

    the object that the method was called on



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# File 'lib/ver/mode.rb', line 42

def ancestors(*done, &block)
  yield self

  @ancestors.each do |ancestor|
    next if done.include?(ancestor)
    yield ancestor
    ancestor.ancestors(done + [self], &block)
  end
end

#attempt_execute(original_stack, lookup = false) ⇒ Object 



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# File 'lib/ver/mode.rb', line 123

def attempt_execute(original_stack, lookup = false)
  if arguments
    stack, arg = Mode.split_stack(original_stack)
  else
    stack, arg = original_stack, nil
  end

  if stack.empty?
    arg ? nil : false
  else
    executable = @map
    while key = stack.shift
      previous = executable
      executable = executable[key]

      case executable
      when nil
        # FIXME: this allows only one mode
        if found = previous.find{|prev_key, prev_value| prev_key.is_a?(Mode) }
          mode, action = found
          looked = mode.attempt_execute([key, *stack], true)

          case looked
          when false
            return false
          when nil
            return nil
          else
            cmd, cmd_arg = looked
            return nil if cmd.is_a?(Hash)
            return execute(action, cmd, arg)
          end
        else
          return false
        end
      end
    end

    if lookup
      return executable, arg
    else
      execute(executable, *arg)
    end
  end
end

#bind(keychain, action_name = nil, &block) ⇒ Object 



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# File 'lib/ver/mode.rb', line 63

def bind(keychain, action_name = nil, &block)
  keychain = keychain.dup
  total = hash = {}

  while key = keychain.shift
    if key.is_a?(Symbol)
      canonical = callback.modes[key]
    else
      canonical = register(key)
    end

    if keychain.empty?
      hash[canonical] = block || action_name
    else
      hash = hash[canonical] = {}
    end
  end

  @map.replace @map.merge(total, &MERGER)
end

#enter_key(key) ⇒ Object 



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# File 'lib/ver/mode.rb', line 92

def enter_key(key)
  @stack << key

  ancestors do |ancestor|
    result = ancestor.attempt_execute(@stack.dup)

    case result
    when nil # nothing matched yet, but possible in future
      return nil
    when false # nothing possible
      # try next one
    when true # executed
      @stack.clear
      return true
    else
      raise "%p is not a valid result" % [result]
    end
  end

  # no ancestors or all failed
  @stack.clear
  enter_missing(key)
rescue => ex
  VER.error(ex)
  @stack.clear
end

#enter_keys(*keys) ⇒ Object 



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# File 'lib/ver/mode.rb', line 88

def enter_keys(*keys)
  keys.flatten.each{|key| enter_key(key) }
end

#enter_missing(key) ⇒ Object 



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# File 'lib/ver/mode.rb', line 119

def enter_missing(key)
  execute(@missing, key) if @missing
end

#execute(executable, *arg) ⇒ Object 



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# File 'lib/ver/mode.rb', line 169

def execute(executable, *arg)
  arg = [*arg].compact # doesn't allow nil
  case executable
  when Hash
    return nil
  when Symbol
    callback.send(executable, *arg)
  when Array
    callback.send(*executable, *arg)
  when Proc
    executable.call(*arg)
  else
    return false
  end

  true
rescue ArgumentError => ex
  callback.message("#{executable} : #{ex}")
  true
end

#find_ancestor(name) ⇒ Object 



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# File 'lib/ver/mode.rb', line 34

def find_ancestor(name)
  if found = callback.modes[name.to_sym]
    return found
  else
    raise "Mode #{name} is not specified yet"
  end
end

#inherits(*others) ⇒ Object 



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# File 'lib/ver/mode.rb', line 26

def inherits(*others)
  others.flatten.each do |other|
    ancestor = find_ancestor(other.to_sym)
    @ancestors.delete ancestor
    @ancestors.unshift ancestor
  end
end

#inspect ⇒ Object 



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# File 'lib/ver/mode.rb', line 13

def inspect
  "#<Mode #@name>"
end

#map(sym, *keychains) ⇒ Object Also known as: to 



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# File 'lib/ver/mode.rb', line 56

def map(sym, *keychains)
  keychains.each do |keychain|
    bind(keychain.flatten, sym)
  end
end

#missing(sym) ⇒ Object 



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# File 'lib/ver/mode.rb', line 52

def missing(sym)
  @missing = sym
end

#register(key) ⇒ Object 



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# File 'lib/ver/mode.rb', line 84

def register(key)
  callback.register(key)
end