Class: Treetop::Compiler::CharacterClass

Inherits:
AtomicExpression show all
Defined in:
lib/treetop/compiler/node_classes/character_class.rb

Instance Attribute Summary

Attributes inherited from ParsingExpression

#address, #builder, #parent_expression, #subexpression_address, #var_symbols

Attributes inherited from Runtime::SyntaxNode

#input, #interval, #parent

Instance Method Summary collapse

Methods inherited from AtomicExpression

#inline_modules, #single_quote

Methods inherited from ParsingExpression

#accumulate_subexpression_result, #accumulator_var, #assign_failure, #assign_lazily_instantiated_node, #assign_result, #begin_comment, #declared_module_name, #decorated?, #end_comment, #epsilon_node, #extend_result, #extend_result_with_declared_module, #extend_result_with_inline_module, #init_value, #inline_module_name, #node_class_name, #obtain_new_subexpression_address, #on_one_line, #optional_arg, #reset_index, #result_var, #start_index_var, #subexpression_result_var, #subexpression_success?, #use_vars, #var, #var_initialization

Methods inherited from Runtime::SyntaxNode

#<=>, #dot_id, #elements, #empty?, #extension_modules, #initialize, #inspect, #nonterminal?, #terminal?, #text_value, #write_dot, #write_dot_file

Constructor Details

This class inherits a constructor from Treetop::Runtime::SyntaxNode

Instance Method Details

#compile(address, builder, parent_expression = nil) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/character_class.rb', line 4

def compile(address, builder, parent_expression = nil)
  super

  builder.if__ "has_terminal?(@regexps[gr = #{grounded_regexp(text_value)}] ||= Regexp.new(gr), :regexp, index)" do
    if address == 0 || decorated?
      assign_result "instantiate_node(#{node_class_name},input, index...(index + 1))"
      extend_result_with_inline_module
    else
      assign_lazily_instantiated_node
    end
    builder << "@index += 1"  # Always one character
  end
  builder.else_ do
    builder << "terminal_parse_failure(#{single_quote('['+characters+']')})"
    assign_result 'nil'
  end
end

#grounded_regexp(string) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/character_class.rb', line 22

def grounded_regexp(string)
  # Double any backslashes, then backslash any single-quotes:
  "'\\A#{string.gsub(/\\/) { '\\\\' }.gsub(/'/) { "\\'"}}'"
end