Class: Dcr::Command

Inherits:
Object
  • Object
show all
Includes:
Glimmer, Strategic
Defined in:
app/models/dcr/command.rb,
app/models/dcr/command/left.rb,
app/models/dcr/command/color.rb,
app/models/dcr/command/empty.rb,
app/models/dcr/command/right.rb,
app/models/dcr/command/repeat.rb,
app/models/dcr/command/forward.rb,
app/models/dcr/command/backward.rb

Overview

Follows the Command, Strategy, and Chain of Responsibility Design Patterns

Direct Known Subclasses

Backward, Color, Empty, Forward, Left, Repeat, Right

Defined Under Namespace

Classes: Backward, Color, Empty, Forward, Left, Repeat, Right

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(program:, text:) ⇒ Command

Returns a new instance of Command.



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# File 'app/models/dcr/command.rb', line 76

def initialize(program: , text: )
  @program = program
  @text = text
end

Instance Attribute Details

#text ⇒ Object (readonly)

Returns the value of attribute text.



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# File 'app/models/dcr/command.rb', line 74

def text
  @text
end

Class Method Details

.command_alias(alias_value) ⇒ Object 



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# File 'app/models/dcr/command.rb', line 44

def command_alias(alias_value)
  command_aliases << alias_value
end

.command_aliases ⇒ Object 



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# File 'app/models/dcr/command.rb', line 48

def command_aliases
  @command_aliases ||= []
end

.command_exclusion(exclusion_value) ⇒ Object 



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# File 'app/models/dcr/command.rb', line 52

def command_exclusion(exclusion_value)
  command_exclusions << exclusion_value
end

.command_exclusions ⇒ Object 



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# File 'app/models/dcr/command.rb', line 56

def command_exclusions
  @command_exclusions ||= []
end

.command_operation ⇒ Object 



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# File 'app/models/dcr/command.rb', line 64

def command_operation
  name.split('::').last.downcase
end

.create(program:, text:) ⇒ Object 



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# File 'app/models/dcr/command.rb', line 29

def create(program: , text: )
  operation = parse_operation(text)
  operation_strategy = strategies.detect { |strategy| strategy.match?(operation) } unless operation.nil?
  operation_strategy ||= Command::Empty
  operation_strategy&.new(program: program, text: text)
end

.match?(operation) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/dcr/command.rb', line 60

def match?(operation)
  (operation_derivatives(command_operation) + command_aliases - command_exclusions).include?(operation.to_s.downcase)
end

.operation_derivatives(operation) ⇒ Object 



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# File 'app/models/dcr/command.rb', line 68

def operation_derivatives(operation)
  operation_length = operation.length
  operation_length.times.map {|n| operation.chars.combination(operation_length - n).to_a}.reduce(:+).map(&:join)
end

.parse_operation(text) ⇒ Object 



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# File 'app/models/dcr/command.rb', line 36

def parse_operation(text)
  text.to_s.strip.downcase.match(/([^ 0-9]+)/).to_a[1]
end

.parse_value(text) ⇒ Object 



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# File 'app/models/dcr/command.rb', line 40

def parse_value(text)
  text.to_s.strip.downcase.match(/[^ 0-9]+[ ]*([^ ]*)/).to_a[1]
end

Instance Method Details

#call ⇒ Object

Subclasses must implement



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# File 'app/models/dcr/command.rb', line 122

def call
  # No Op
end

#normalized_text ⇒ Object 



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# File 'app/models/dcr/command.rb', line 117

def normalized_text
  "#{operation} #{value}"
end

#operation ⇒ Object

Subclasses must override to provide parsed operation (e.g. ‘f’ becomes ‘forward’)



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# File 'app/models/dcr/command.rb', line 95

def operation
  parsed_operation
end

#operation=(new_operation) ⇒ Object 



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# File 'app/models/dcr/command.rb', line 81

def operation=(new_operation)
  return if parse_operation(new_operation) == parsed_operation
  @text.sub(parsed_operation, new_operation)
  command_index_of_self = @program.commands.index(self)
  @program.commands[command_index_of_self..command_index_of_self] = create(program: @program, text: @text)
end

#operation_options ⇒ Object 



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# File 'app/models/dcr/command.rb', line 103

def operation_options
  Command.strategy_names
end

#parsed_operation ⇒ Object 



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# File 'app/models/dcr/command.rb', line 99

def parsed_operation
  Command.parse_operation(@text)
end

#parsed_value ⇒ Object 



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# File 'app/models/dcr/command.rb', line 112

def parsed_value
  parsed_value = Command.parse_value(@text)
  parsed_value.to_s.match(/\d+/) ? parsed_value.to_i : parsed_value
end

#value ⇒ Object

Subclasses must override to provide parsed value (e.g. ‘r’ becomes ‘red’ or ‘30’ becomes 30)



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# File 'app/models/dcr/command.rb', line 108

def value
  parsed_value
end

#value=(new_value) ⇒ Object 



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# File 'app/models/dcr/command.rb', line 88

def value=(new_value)
  return if parse_value(new_value) == parsed_value
  @text.sub(parsed_value, new_value)
  @program.notify_observers('commands')
end