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, #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 



4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
 
# 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))"
	    extend_result_with_inline_module
    else
      assign_lazily_instantiated_node
	  end
    builder << "@index += match_len"
  end
  builder.else_ do
    builder << "terminal_parse_failure(#{string})"
    assign_result 'nil'
  end
end