Class: Inform::Verb::Grammar

Inherits:
Array show all
Defined in:
lib/story_teller/grammar_parser.rb

Overview

Grammars

Constant Summary collapse

MultipleEnquotedPrepositionPattern = 
%r{^'(.*)'/'(.*)'+$}.freeze
SingleEnquotedPrepositionPattern = 
%r{^'(.*)'$}.freeze
CustomScopePattern = 
%r{^(.*)=(.*)$}.freeze
SpaceString = 
' '.freeze
Indention = 
SpaceString * 4
AsteriskString = 
'*'.freeze
ReverseString = 
'reverse'.freeze
ArrowString = 
'->'.freeze
GrammarTokenPadding = 
40

Constants inherited from Array

Array::Empty

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Array

#+, #average, #having, #identities, #longest_length, #pad, #plus_operator, #ruby_to_s, #sum, #to_sentence

Constructor Details

#initialize(grammar, source, action, reverse = nil) ⇒ Grammar

Returns a new instance of Grammar.



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# File 'lib/story_teller/grammar_parser.rb', line 118

def initialize(grammar, source, action, reverse = nil)
  super()
  concat(symbolize_grammar(grammar)) unless grammar.empty?
  push(:end)
  @action = action
  @expected_tokens = grammar.map { |a| CustomScopePattern.match?(a) ? a.to_s.split('=').first.to_sym : a }
  @reverse = reverse.nil? ? false : reverse
  @source = source
end

Instance Attribute Details

#action ⇒ Object (readonly)

Returns the value of attribute action.



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# File 'lib/story_teller/grammar_parser.rb', line 116

def action
  @action
end

#expected_tokens ⇒ Object (readonly)

Returns the value of attribute expected_tokens.



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# File 'lib/story_teller/grammar_parser.rb', line 116

def expected_tokens
  @expected_tokens
end

#source ⇒ Object (readonly)

Returns the value of attribute source.



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# File 'lib/story_teller/grammar_parser.rb', line 116

def source
  @source
end

Instance Method Details

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/story_teller/grammar_parser.rb', line 128

def empty?
  length == (include?(:end) ? 1 : 0)
end

#expected_parameters ⇒ Object 



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# File 'lib/story_teller/grammar_parser.rb', line 159

def expected_parameters
  reverse? ? reversed_parameters : parameters
end

#parameters ⇒ Object 



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# File 'lib/story_teller/grammar_parser.rb', line 151

def parameters
  @parameters ||= []
end

#reverse? ⇒ Boolean Also known as: reversed?

Returns:

  • (Boolean) 


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# File 'lib/story_teller/grammar_parser.rb', line 163

def reverse?
  @reverse
end

#reversed_parameters ⇒ Object 



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# File 'lib/story_teller/grammar_parser.rb', line 155

def reversed_parameters
  @reversed_parameters ||= [parameters[1], parameters[0]] + parameters[2..]
end

#to_s ⇒ Object Also known as: to_str 



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# File 'lib/story_teller/grammar_parser.rb', line 139

def to_s
  Indention + AsteriskString + SpaceString +
    tokens_sans_end.ljust(GrammarTokenPadding) +
    ArrowString + SpaceString + action +
    if reverse?
      SpaceString + ReverseString
    else
      ''
    end
end