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

rubocop: disable Metrics/MethodLength



127
128
129
130
131
132
133
134
135
136
137
138
139
140
 
# File 'lib/story_teller/grammar_parser.rb', line 127

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

Instance Attribute Details

#action ⇒ Object (readonly)

Returns the value of attribute action.



124
125
126
 
# File 'lib/story_teller/grammar_parser.rb', line 124

def action
  @action
end

#expected_tokens ⇒ Object (readonly)

Returns the value of attribute expected_tokens.



124
125
126
 
# File 'lib/story_teller/grammar_parser.rb', line 124

def expected_tokens
  @expected_tokens
end

#source ⇒ Object (readonly)

Returns the value of attribute source.



124
125
126
 
# File 'lib/story_teller/grammar_parser.rb', line 124

def source
  @source
end

Instance Method Details

#empty? ⇒ Boolean

rubocop: enable Metrics/MethodLength

Returns:

  • (Boolean) 


143
144
145
 
# File 'lib/story_teller/grammar_parser.rb', line 143

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

#expected_parameters ⇒ Object 



174
175
176
 
# File 'lib/story_teller/grammar_parser.rb', line 174

def expected_parameters
  reverse? ? reversed_parameters : parameters
end

#parameters ⇒ Object 



166
167
168
 
# File 'lib/story_teller/grammar_parser.rb', line 166

def parameters
  @parameters ||= []
end

#reverse? ⇒ Boolean Also known as: reversed?

Returns:

  • (Boolean) 


178
179
180
 
# File 'lib/story_teller/grammar_parser.rb', line 178

def reverse?
  @reverse
end

#reversed_parameters ⇒ Object 



170
171
172
 
# File 'lib/story_teller/grammar_parser.rb', line 170

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

#to_s ⇒ Object Also known as: to_str 



154
155
156
157
158
159
160
161
162
163
 
# File 'lib/story_teller/grammar_parser.rb', line 154

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