Class: Treetop::Compiler::Terminal

Inherits:
AtomicExpression show all
Defined in:
lib/treetop/compiler/node_classes/terminal.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, #inspect_children, #inspect_self, #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/terminal.rb', line 4

def compile(address, builder, parent_expression = nil)
  super
  # Handle modifiers:
  insensitive = modifiers.text_value.include? 'i'
  re = modifiers.text_value.include? 'r'
  if re
    grounded_regexp = "#{('\A'+eval(string)).inspect}"
    cache_key = "'__#{modifiers.text_value}__'+(gr = #{grounded_regexp})"
    re_modifiers = "#{insensitive ? 'Regexp::IGNORECASE' : 0}"
    str = "@regexps[#{cache_key}] ||= Regexp.new(gr, #{re_modifiers})"
    mode = ':regexp'
  elsif insensitive
    str = string.downcase
    string_length = eval(str).length
    mode = ':insens'
  else
    str = string
    string_length = eval(str).length
    mode = 'false'
  end

  builder.if__ "(match_len = has_terminal?(#{str}, #{mode}, index))" do
    if address == 0 || decorated? || mode != 'false' || string_length > 1
      assign_result "instantiate_node(#{node_class_name},input, index...(index + match_len))"
      # debugger if parent_expression and parent_expression.inline_modules.size > 0
      # extend_result_with_inline_module parent_expression
      if parent_expression
        parent_expression.inline_modules.each do |inline|
          extend_result inline.module_name
        end
      end
    else
      assign_lazily_instantiated_node
    end
    builder << "@index += match_len"
  end
  builder.else_ do
    builder << "terminal_parse_failure(#{expected})"
    assign_result 'nil'
  end
end

#expected ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/terminal.rb', line 46

def expected
  single_quote(string)
end

#inline_module ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/terminal.rb', line 50

def inline_module
  nil
end