Add --frozen to add frozen_string_literals to top of generated files.

bin/racc

@@ -19,6 +19,7 @@ def main
   make_executable = false
   rubypath = nil
   embed_runtime = false
+  frozen_strings = false
   debug_flags = Racc::DebugFlags.new
   line_convert = true
   line_convert_all = false
@@ -57,6 +58,9 @@ def main
   parser.on('-E', '--embedded', "Embeds Racc runtime in output.") {
     embed_runtime = true
   }
+  parser.on('-F', '--frozen', "Add frozen_string_literals: true.") {
+    frozen_strings = true
+  }
   parser.on('--line-convert-all', 'Converts line numbers of user codes.') {
     line_convert_all = true
   }
@@ -162,6 +166,7 @@ def main
     params.convert_line = line_convert
     params.convert_line_all = line_convert_all
     params.embed_runtime = embed_runtime
+    params.frozen_strings = frozen_strings
     profiler.section('generation') {
       generator = Racc::ParserFileGenerator.new(states, params)
       generator.generate_parser_file(output || make_filename(input, '.tab.rb'))

lib/racc/parserfilegenerator.rb

@@ -45,6 +45,7 @@ def #{name}=(b)
       bool_attr :convert_line
       bool_attr :convert_line_all
       bool_attr :embed_runtime
+      bool_attr :frozen_strings
       bool_attr :make_executable
       attr_accessor :interpreter
 
@@ -64,6 +65,7 @@ def initialize
         self.convert_line = true
         self.convert_line_all = false
         self.embed_runtime = false
+        self.frozen_strings = false
         self.make_executable = false
         self.interpreter = nil
       end
@@ -122,6 +124,7 @@ def shebang(path)
     end
 
     def notice
+      line %q[# frozen_string_literal: true] if @params.frozen_strings?
       line %q[#]
       line %q[# DO NOT MODIFY!!!!]
       line %Q[# This file is automatically generated by Racc #{Racc::Version}]

test/assets/frozen.y

@@ -0,0 +1,47 @@
+class Journey::Parser
+
+token SLASH LITERAL SYMBOL LPAREN RPAREN DOT STAR OR
+
+rule
+  expressions
+    : expressions expression  { result = Cat.new(val.first, val.last) }
+    | expression              { result = val.first }
+    | or
+    ;
+  expression
+    : terminal
+    | group
+    | star
+    ;
+  group
+    : LPAREN expressions RPAREN { result = Group.new(val[1]) }
+    ;
+  or
+    : expressions OR expression { result = Or.new([val.first, val.last]) }
+    ;
+  star
+    : STAR       { result = Star.new(Symbol.new(val.last)) }
+    ;
+  terminal
+    : symbol
+    | literal
+    | slash
+    | dot
+    ;
+  slash
+    : SLASH              { result = Slash.new('/') }
+    ;
+  symbol
+    : SYMBOL             { result = Symbol.new(val.first) }
+    ;
+  literal
+    : LITERAL            { result = Literal.new(val.first) }
+  dot
+    : DOT                { result = Dot.new(val.first) }
+    ;
+
+end
+
+---- header
+
+require 'journey/parser_extras'

test/regress/frozen

@@ -0,0 +1,225 @@
+# frozen_string_literal: true
+#
+# DO NOT MODIFY!!!!
+# This file is automatically generated by Racc 1.5.2
+# from Racc grammar file "".
+#
+
+require 'racc/parser.rb'
+
+
+require 'journey/parser_extras'
+module Journey
+  class Parser < Racc::Parser
+##### State transition tables begin ###
+
+racc_action_table = [
+    17,    21,    13,    15,    14,     7,   nil,    16,     8,    19,
+    13,    15,    14,     7,    23,    16,     8,    19,    13,    15,
+    14,     7,   nil,    16,     8,    13,    15,    14,     7,   nil,
+    16,     8,    13,    15,    14,     7,   nil,    16,     8 ]
+
+racc_action_check = [
+     1,    17,     1,     1,     1,     1,   nil,     1,     1,     1,
+    20,    20,    20,    20,    20,    20,    20,    20,     0,     0,
+     0,     0,   nil,     0,     0,     7,     7,     7,     7,   nil,
+     7,     7,    19,    19,    19,    19,   nil,    19,    19 ]
+
+racc_action_pointer = [
+    16,     0,   nil,   nil,   nil,   nil,   nil,    23,   nil,   nil,
+   nil,   nil,   nil,   nil,   nil,   nil,   nil,     1,   nil,    30,
+     8,   nil,   nil,   nil ]
+
+racc_action_default = [
+   -18,   -18,    -2,    -3,    -4,    -5,    -6,   -18,    -9,   -10,
+   -11,   -12,   -13,   -14,   -15,   -16,   -17,   -18,    -1,   -18,
+   -18,    24,    -8,    -7 ]
+
+racc_goto_table = [
+    18,     1,   nil,   nil,   nil,   nil,   nil,   nil,    20,   nil,
+   nil,   nil,   nil,   nil,   nil,   nil,   nil,   nil,    22,    18 ]
+
+racc_goto_check = [
+     2,     1,   nil,   nil,   nil,   nil,   nil,   nil,     1,   nil,
+   nil,   nil,   nil,   nil,   nil,   nil,   nil,   nil,     2,     2 ]
+
+racc_goto_pointer = [
+   nil,     1,    -1,   nil,   nil,   nil,   nil,   nil,   nil,   nil,
+   nil ]
+
+racc_goto_default = [
+   nil,   nil,     2,     3,     4,     5,     6,     9,    10,    11,
+    12 ]
+
+racc_reduce_table = [
+  0, 0, :racc_error,
+  2, 11, :_reduce_1,
+  1, 11, :_reduce_2,
+  1, 11, :_reduce_none,
+  1, 12, :_reduce_none,
+  1, 12, :_reduce_none,
+  1, 12, :_reduce_none,
+  3, 15, :_reduce_7,
+  3, 13, :_reduce_8,
+  1, 16, :_reduce_9,
+  1, 14, :_reduce_none,
+  1, 14, :_reduce_none,
+  1, 14, :_reduce_none,
+  1, 14, :_reduce_none,
+  1, 19, :_reduce_14,
+  1, 17, :_reduce_15,
+  1, 18, :_reduce_16,
+  1, 20, :_reduce_17 ]
+
+racc_reduce_n = 18
+
+racc_shift_n = 24
+
+racc_token_table = {
+  false => 0,
+  :error => 1,
+  :SLASH => 2,
+  :LITERAL => 3,
+  :SYMBOL => 4,
+  :LPAREN => 5,
+  :RPAREN => 6,
+  :DOT => 7,
+  :STAR => 8,
+  :OR => 9 }
+
+racc_nt_base = 10
+
+racc_use_result_var = true
+
+Racc_arg = [
+  racc_action_table,
+  racc_action_check,
+  racc_action_default,
+  racc_action_pointer,
+  racc_goto_table,
+  racc_goto_check,
+  racc_goto_default,
+  racc_goto_pointer,
+  racc_nt_base,
+  racc_reduce_table,
+  racc_token_table,
+  racc_shift_n,
+  racc_reduce_n,
+  racc_use_result_var ]
+Ractor.make_shareable(Racc_arg) if defined?(Ractor)
+
+Racc_token_to_s_table = [
+  "$end",
+  "error",
+  "SLASH",
+  "LITERAL",
+  "SYMBOL",
+  "LPAREN",
+  "RPAREN",
+  "DOT",
+  "STAR",
+  "OR",
+  "$start",
+  "expressions",
+  "expression",
+  "or",
+  "terminal",
+  "group",
+  "star",
+  "symbol",
+  "literal",
+  "slash",
+  "dot" ]
+Ractor.make_shareable(Racc_token_to_s_table) if defined?(Ractor)
+
+Racc_debug_parser = false
+
+##### State transition tables end #####
+
+# reduce 0 omitted
+
+module_eval(<<'.,.,', 'frozen.y', 6)
+  def _reduce_1(val, _values, result)
+     result = Cat.new(val.first, val.last)
+    result
+  end
+.,.,
+
+module_eval(<<'.,.,', 'frozen.y', 7)
+  def _reduce_2(val, _values, result)
+     result = val.first
+    result
+  end
+.,.,
+
+# reduce 3 omitted
+
+# reduce 4 omitted
+
+# reduce 5 omitted
+
+# reduce 6 omitted
+
+module_eval(<<'.,.,', 'frozen.y', 16)
+  def _reduce_7(val, _values, result)
+     result = Group.new(val[1])
+    result
+  end
+.,.,
+
+module_eval(<<'.,.,', 'frozen.y', 19)
+  def _reduce_8(val, _values, result)
+     result = Or.new([val.first, val.last])
+    result
+  end
+.,.,
+
+module_eval(<<'.,.,', 'frozen.y', 22)
+  def _reduce_9(val, _values, result)
+     result = Star.new(Symbol.new(val.last))
+    result
+  end
+.,.,
+
+# reduce 10 omitted
+
+# reduce 11 omitted
+
+# reduce 12 omitted
+
+# reduce 13 omitted
+
+module_eval(<<'.,.,', 'frozen.y', 31)
+  def _reduce_14(val, _values, result)
+     result = Slash.new('/')
+    result
+  end
+.,.,
+
+module_eval(<<'.,.,', 'frozen.y', 34)
+  def _reduce_15(val, _values, result)
+     result = Symbol.new(val.first)
+    result
+  end
+.,.,
+
+module_eval(<<'.,.,', 'frozen.y', 37)
+  def _reduce_16(val, _values, result)
+     result = Literal.new(val.first)
+    result
+  end
+.,.,
+
+module_eval(<<'.,.,', 'frozen.y', 39)
+  def _reduce_17(val, _values, result)
+     result = Dot.new(val.first)
+    result
+  end
+.,.,
+
+def _reduce_none(val, _values, result)
+  val[0]
+end
+
+  end   # class Parser
+end   # module Journey

test/test_racc_command.rb

@@ -199,6 +199,14 @@ def test_journey
       assert_output_unchanged 'journey.y'
     end
 
+    # .y file from journey gem, but with --frozen
+
+    def test_frozen
+      assert_compile 'frozen.y', '--frozen'
+      assert_debugfile 'frozen.y', []
+      assert_output_unchanged 'frozen.y'
+    end
+
     # .y file from nokogiri gem
 
     def test_nokogiri_css