Class: Lrama::Grammar::RuleBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/lrama/grammar/rule_builder.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(rule_counter, midrule_action_counter, parameterizing_rule_resolver, position_in_original_rule_rhs = nil, lhs_tag: nil, skip_preprocess_references: false) ⇒ RuleBuilder

Returns a new instance of RuleBuilder.



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# File 'lib/lrama/grammar/rule_builder.rb', line 9

def initialize(rule_counter, midrule_action_counter, parameterizing_rule_resolver, position_in_original_rule_rhs = nil, lhs_tag: nil, skip_preprocess_references: false)
  @rule_counter = rule_counter
  @midrule_action_counter = midrule_action_counter
  @parameterizing_rule_resolver = parameterizing_rule_resolver
  @position_in_original_rule_rhs = position_in_original_rule_rhs
  @skip_preprocess_references = skip_preprocess_references

  @lhs = nil
  @lhs_tag = lhs_tag
  @rhs = []
  @user_code = nil
  @precedence_sym = nil
  @line = nil
  @rules = []
  @rule_builders_for_parameterizing_rules = []
  @rule_builders_for_derived_rules = []
  @parameterizing_rules = []
  @midrule_action_rules = []
end

Instance Attribute Details

#lhs ⇒ Object

Returns the value of attribute lhs.



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# File 'lib/lrama/grammar/rule_builder.rb', line 6

def lhs
  @lhs
end

#lhs_tag ⇒ Object (readonly)

Returns the value of attribute lhs_tag.



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# File 'lib/lrama/grammar/rule_builder.rb', line 7

def lhs_tag
  @lhs_tag
end

#line ⇒ Object

Returns the value of attribute line.



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# File 'lib/lrama/grammar/rule_builder.rb', line 6

def line
  @line
end

#precedence_sym ⇒ Object

Returns the value of attribute precedence_sym.



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# File 'lib/lrama/grammar/rule_builder.rb', line 7

def precedence_sym
  @precedence_sym
end

#rhs ⇒ Object (readonly)

Returns the value of attribute rhs.



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# File 'lib/lrama/grammar/rule_builder.rb', line 7

def rhs
  @rhs
end

#user_code ⇒ Object

Returns the value of attribute user_code.



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# File 'lib/lrama/grammar/rule_builder.rb', line 7

def user_code
  @user_code
end

Instance Method Details

#add_rhs(rhs) ⇒ Object 



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# File 'lib/lrama/grammar/rule_builder.rb', line 29

def add_rhs(rhs)
  @line ||= rhs.line

  flush_user_code

  @rhs << rhs
end

#complete_input ⇒ Object 



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# File 'lib/lrama/grammar/rule_builder.rb', line 51

def complete_input
  freeze_rhs
end

#has_inline_rules? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lrama/grammar/rule_builder.rb', line 65

def has_inline_rules?
  rhs.any? { |token| @parameterizing_rule_resolver.find_inline(token) }
end

#resolve_inline_rules ⇒ Object 



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# File 'lib/lrama/grammar/rule_builder.rb', line 69

def resolve_inline_rules
  resolved_builders = [] #: Array[RuleBuilder]
  rhs.each_with_index do |token, i|
    if (inline_rule = @parameterizing_rule_resolver.find_inline(token))
      inline_rule.rhs_list.each do |inline_rhs|
        rule_builder = RuleBuilder.new(@rule_counter, @midrule_action_counter, @parameterizing_rule_resolver, lhs_tag: lhs_tag)
        if token.is_a?(Lexer::Token::InstantiateRule)
          resolve_inline_rhs(rule_builder, inline_rhs, i, Binding.new(inline_rule.parameters, token.args))
        else
          resolve_inline_rhs(rule_builder, inline_rhs, i)
        end
        rule_builder.lhs = lhs
        rule_builder.line = line
        rule_builder.precedence_sym = precedence_sym
        rule_builder.user_code = replace_inline_user_code(inline_rhs, i)
        resolved_builders << rule_builder
      end
      break
    end
  end
  resolved_builders
end

#rules ⇒ Object 



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# File 'lib/lrama/grammar/rule_builder.rb', line 61

def rules
  @parameterizing_rules + @midrule_action_rules + @rules
end

#setup_rules ⇒ Object 



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# File 'lib/lrama/grammar/rule_builder.rb', line 55

def setup_rules
  preprocess_references unless @skip_preprocess_references
  process_rhs
  build_rules
end