Class: Sashite::Pan::Action::DropCapture

Inherits:
Object
  • Object
show all
Defined in:
lib/sashite/pan/action/drop_capture.rb

Overview

Drop capture action class

Handles drop actions with capture - placing a piece from reserve onto an occupied square, capturing the piece there.

Format: [<piece>].<destination> Examples: “L.b4”, “.c3”, “P.e5=+P”

Constant Summary collapse

TYPE =

Action type

:drop_capture
OPERATOR =

Operator constant

"."
TRANSFORMATION_SEPARATOR =

Transformation separator

"="
ERROR_INVALID_DROP_CAPTURE =

Error messages

"Invalid drop capture notation: %s"
ERROR_INVALID_DESTINATION = 
"Invalid destination coordinate: %s"
ERROR_INVALID_PIECE = 
"Invalid piece identifier: %s"
ERROR_INVALID_TRANSFORMATION = 
"Invalid transformation piece: %s"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(destination, piece: nil, transformation: nil) ⇒ DropCapture

Create a new drop capture action instance

Examples:

DropCapture.new("b4", piece: "L")                    # => #<DropCapture ...>
DropCapture.new("c3")                                # => #<DropCapture ...>
DropCapture.new("e5", piece: "P", transformation: "+P") # => #<DropCapture ...>

Parameters:

  • destination (String) —

    destination CELL coordinate

  • piece (String, nil) (defaults to: nil) —

    optional EPIN piece identifier

  • transformation (String, nil) (defaults to: nil) —

    optional EPIN transformation

Raises:

  • (ArgumentError) —

    if coordinates, piece, or transformation are invalid



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# File 'lib/sashite/pan/action/drop_capture.rb', line 120

def initialize(destination, piece: nil, transformation: nil)
  unless ::Sashite::Cell.valid?(destination)
    raise ::ArgumentError, format(ERROR_INVALID_DESTINATION, destination)
  end

  raise ::ArgumentError, format(ERROR_INVALID_PIECE, piece) if piece && !::Sashite::Epin.valid?(piece)

  if transformation && !::Sashite::Epin.valid?(transformation)
    raise ::ArgumentError, format(ERROR_INVALID_TRANSFORMATION, transformation)
  end

  @destination = destination
  @piece = piece
  @transformation = transformation

  freeze
end

Instance Attribute Details

#destination ⇒ String (readonly)

Returns destination CELL coordinate.

Returns:

  • (String) —

    destination CELL coordinate



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# File 'lib/sashite/pan/action/drop_capture.rb', line 33

def destination
  @destination
end

#piece ⇒ String? (readonly)

Returns optional EPIN piece identifier.

Returns:

  • (String, nil) —

    optional EPIN piece identifier



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# File 'lib/sashite/pan/action/drop_capture.rb', line 36

def piece
  @piece
end

#transformation ⇒ String? (readonly)

Returns optional EPIN transformation.

Returns:

  • (String, nil) —

    optional EPIN transformation



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# File 'lib/sashite/pan/action/drop_capture.rb', line 39

def transformation
  @transformation
end

Class Method Details

.parse(pan_string) ⇒ DropCapture

Parse a drop capture notation string into a DropCapture instance

Examples:

DropCapture.parse("L.b4")      # => #<DropCapture piece="L" destination="b4">
DropCapture.parse(".c3")       # => #<DropCapture destination="c3">
DropCapture.parse("P.e5=+P")   # => #<DropCapture piece="P" destination="e5" transformation="+P">

Parameters:

  • pan_string (String) —

    drop capture notation string

Returns:

Raises:

  • (ArgumentError) —

    if the string is not valid drop capture notation



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# File 'lib/sashite/pan/action/drop_capture.rb', line 90

def self.parse(pan_string)
  raise ::ArgumentError, format(ERROR_INVALID_DROP_CAPTURE, pan_string) unless valid?(pan_string)

  parts = pan_string.split(OPERATOR, 2)
  piece = parts[0].empty? ? nil : parts[0]
  dest_and_transform = parts[1]

  if dest_and_transform.include?(TRANSFORMATION_SEPARATOR)
    dest_parts = dest_and_transform.split(TRANSFORMATION_SEPARATOR, 2)
    destination = dest_parts[0]
    transformation = dest_parts[1]
  else
    destination = dest_and_transform
    transformation = nil
  end

  new(destination, piece: piece, transformation: transformation)
end

.valid?(pan_string) ⇒ Boolean

Check if a string represents a valid drop capture action

Examples:

DropCapture.valid?("L.b4")       # => true
DropCapture.valid?(".c3")        # => true
DropCapture.valid?("P.e5=+P")    # => true

Parameters:

  • pan_string (String) —

    the string to validate

Returns:

  • (Boolean) —

    true if valid drop capture notation



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# File 'lib/sashite/pan/action/drop_capture.rb', line 50

def self.valid?(pan_string)
  return false unless pan_string.is_a?(::String)
  return false unless pan_string.include?(OPERATOR)

  parts = pan_string.split(OPERATOR, 2)
  return false if parts.size != 2

  piece_part = parts[0]
  dest_and_transform = parts[1]

  # Piece part is optional, but if present must be valid EPIN
  return false if !piece_part.empty? && !::Sashite::Epin.valid?(piece_part)

  # Check if there's a transformation
  if dest_and_transform.include?(TRANSFORMATION_SEPARATOR)
    dest_parts = dest_and_transform.split(TRANSFORMATION_SEPARATOR, 2)
    return false if dest_parts.size != 2

    destination_part = dest_parts[0]
    transformation_part = dest_parts[1]

    return false unless ::Sashite::Cell.valid?(destination_part)
    return false unless ::Sashite::Epin.valid?(transformation_part)
  else
    return false unless ::Sashite::Cell.valid?(dest_and_transform)
  end

  true
end

Instance Method Details

#==(other) ⇒ Boolean Also known as: eql?

Custom equality comparison

Parameters:

  • other (Object) —

    object to compare with

Returns:

  • (Boolean) —

    true if actions are equal



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# File 'lib/sashite/pan/action/drop_capture.rb', line 241

def ==(other)
  return false unless other.is_a?(self.class)

  destination == other.destination &&
    piece == other.piece &&
    transformation == other.transformation
end

#capture? ⇒ Boolean

Check if this is a capture action

Returns:

  • (Boolean) —

    false



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# File 'lib/sashite/pan/action/drop_capture.rb', line 184

def capture?
  false
end

#drop? ⇒ Boolean

Check if this is a drop action

Returns:

  • (Boolean) —

    false



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# File 'lib/sashite/pan/action/drop_capture.rb', line 205

def drop?
  false
end

#drop_action? ⇒ Boolean

Check if this is a drop action (drop or drop_capture)

Returns:

  • (Boolean) —

    true



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# File 'lib/sashite/pan/action/drop_capture.rb', line 233

def drop_action?
  true
end

#drop_capture? ⇒ Boolean

Check if this is a drop capture action

Returns:

  • (Boolean) —

    true



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# File 'lib/sashite/pan/action/drop_capture.rb', line 212

def drop_capture?
  true
end

#hash ⇒ Integer

Custom hash implementation for use in collections

Returns:

  • (Integer) —

    hash value



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# File 'lib/sashite/pan/action/drop_capture.rb', line 255

def hash
  [self.class, destination, piece, transformation].hash
end

#modify? ⇒ Boolean

Check if this is a modify action

Returns:

  • (Boolean) —

    false



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# File 'lib/sashite/pan/action/drop_capture.rb', line 219

def modify?
  false
end

#move? ⇒ Boolean

Check if this is a move action

Returns:

  • (Boolean) —

    false



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# File 'lib/sashite/pan/action/drop_capture.rb', line 177

def move?
  false
end

#movement? ⇒ Boolean

Check if this is a movement action

Returns:

  • (Boolean) —

    false



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# File 'lib/sashite/pan/action/drop_capture.rb', line 226

def movement?
  false
end

#pass? ⇒ Boolean

Check if this is a pass action

Returns:

  • (Boolean) —

    false



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# File 'lib/sashite/pan/action/drop_capture.rb', line 170

def pass?
  false
end

#source ⇒ nil

Get the source coordinate

Returns:

  • (nil) —

    drop capture actions have no source



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# File 'lib/sashite/pan/action/drop_capture.rb', line 148

def source
  nil
end

#special? ⇒ Boolean

Check if this is a special action

Returns:

  • (Boolean) —

    false



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# File 'lib/sashite/pan/action/drop_capture.rb', line 191

def special?
  false
end

#static_capture? ⇒ Boolean

Check if this is a static capture action

Returns:

  • (Boolean) —

    false



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# File 'lib/sashite/pan/action/drop_capture.rb', line 198

def static_capture?
  false
end

#to_s ⇒ String

Convert the action to its PAN string representation

Examples:

action.to_s  # => "L.b4" or ".c3" or "P.e5=+P"

Returns:

  • (String) —

    drop capture notation



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# File 'lib/sashite/pan/action/drop_capture.rb', line 158

def to_s
  result = +""
  result << piece if piece
  result << OPERATOR
  result << destination
  result << TRANSFORMATION_SEPARATOR << transformation if transformation
  result
end

#type ⇒ Symbol

Get the action type

Returns:

  • (Symbol) —

    :drop_capture



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# File 'lib/sashite/pan/action/drop_capture.rb', line 141

def type
  TYPE
end