Get tests passing with frozen-string-literals enabled.

lib/gettext/mo.rb

@@ -43,8 +43,8 @@ class HeaderRev1 < Header
       :trans_sysdep_tab_offset
     end
 
-    MAGIC_BIG_ENDIAN    = "\x95\x04\x12\xde".force_encoding("ASCII-8BIT")
-    MAGIC_LITTLE_ENDIAN = "\xde\x12\x04\x95".force_encoding("ASCII-8BIT")
+    MAGIC_BIG_ENDIAN    = "\x95\x04\x12\xde".dup.force_encoding("ASCII-8BIT")
+    MAGIC_LITTLE_ENDIAN = "\xde\x12\x04\x95".dup.force_encoding("ASCII-8BIT")
 
     def self.open(arg = nil, output_charset = nil)
       result = self.new(output_charset)
@@ -325,7 +325,7 @@ def convert_encoding(string, original_string)
     end
 
     def generate_original_string(msgid, options)
-      string = ""
+      string = "".dup
 
       msgctxt = options.delete(:msgctxt)
       msgid_plural = options.delete(:msgid_plural)

lib/gettext/po.rb

@@ -194,7 +194,7 @@ def set_comment(msgid, comment, msgctxt=nil)
     # @return [String] Formatted and joined PO entries. It is used for
     #   creating .po files.
     def to_s(options={})
-      po_string = ""
+      po_string = "".dup
 
       header_entry = @entries[[nil, ""]]
       unless header_entry.nil?

lib/gettext/po_entry.rb

@@ -83,7 +83,7 @@ def initialize(type)
     # @return [void]
     def add_comment(new_comment)
       if (new_comment and ! new_comment.empty?)
-        @extracted_comment ||= ""
+        @extracted_comment ||= "".dup
         @extracted_comment << "\n" unless @extracted_comment.empty?
         @extracted_comment << new_comment
       end
@@ -366,7 +366,7 @@ def include_previous_comment?
       end
 
       def format_comments
-        formatted_comment = ""
+        formatted_comment = "".dup
         if include_translator_comment?
           formatted_comment << format_translator_comment
         end
@@ -395,7 +395,7 @@ def format_extracted_comment
 
       def format_reference_comment
         max_line_width = @options[:max_line_width]
-        formatted_reference = ""
+        formatted_reference = "".dup
         if not @entry.references.nil? and not @entry.references.empty?
           formatted_reference << REFERENCE_COMMENT_MARK
           line_width = 2
@@ -417,7 +417,7 @@ def format_reference_comment
       end
 
       def format_flag_comment
-        formatted_flags = ""
+        formatted_flags = "".dup
         @entry.flags.each do |flag|
           formatted_flags << format_comment(FLAG_MARK, flag)
         end
@@ -431,7 +431,7 @@ def format_previous_comment
       def format_comment(mark, comment)
         return "" if comment.nil?
 
-        formatted_comment = ""
+        formatted_comment = "".dup
         comment.each_line do |comment_line|
           if comment_line == "\n"
             formatted_comment << "#{mark}\n"
@@ -446,7 +446,7 @@ def format_obsolete_comment(comment)
         mark = "#~"
         return "" if comment.nil?
 
-        formatted_comment = ""
+        formatted_comment = "".dup
         comment.each_line do |comment_line|
           if /\A#[^~]/ =~ comment_line or comment_line.start_with?(mark)
             formatted_comment << "#{comment_line.chomp}\n"
@@ -466,7 +466,7 @@ def format_message(message)
         chunks = wrap_message(message)
         return empty_formatted_message if chunks.empty?
 
-        formatted_message = ""
+        formatted_message = "".dup
         if chunks.size > 1 or chunks.first.end_with?("\n")
           formatted_message << empty_formatted_message
         end

lib/gettext/tools/msgcat.rb

@@ -121,7 +121,7 @@ def remove_header_fields!(header_entry)
           msgstr = header_entry.msgstr
           return if msgstr.nil?
 
-          new_msgstr = ""
+          new_msgstr = "".dup
           msgstr.each_line do |line|
             case line
             when /\A([\w\-]+):/

lib/gettext/tools/parser/ruby.rb

@@ -236,7 +236,7 @@ def parse_source(source)
 
       po_entry = nil
       line_no = nil
-      last_comment = ""
+      last_comment = "".dup
       reset_comment = false
       ignore_next_comma = false
       rl.parse do |tk|
@@ -287,7 +287,7 @@ def parse_source(source)
 
         case tk
         when RubyToken::TkCOMMENT_WITH_CONTENT
-          last_comment = "" if reset_comment
+          last_comment = "".dup if reset_comment
           if last_comment.empty?
             comment1 = tk.value.lstrip
             if comment_to_be_extracted?(comment1)

test/test_po.rb

@@ -208,7 +208,7 @@ class TestOrder < self
     def setup
       @po = GetText::PO.new
       parser = GetText::POParser.new
-      parser.parse(<<-PO, @po)
+      parser.parse(<<-PO.dup, @po)
 #: hello.rb:2
 msgid "World"
 msgstr ""
@@ -300,7 +300,7 @@ def setup
 
     class TestHeader < self
       def test_no_entry
-        @po[""] = <<-HEADER
+        @po[""] = <<-HEADER.dup
 Project-Id-Version: test 1.0.0
 POT-Creation-Date: 2012-10-31 12:40+0900
 PO-Revision-Date: 2012-11-01 17:46+0900
@@ -312,7 +312,7 @@ def test_no_entry
 Content-Transfer-Encoding: 8bit
 Plural-Forms: nplurals=2; plural=(n != 1)
         HEADER
-        @po[""].translator_comment = <<-HEADER_COMMENT
+        @po[""].translator_comment = <<-HEADER_COMMENT.dup
 Japanese translations for test package.
 Copyright (C) 2012 THE PACKAGE'S COPYRIGHT HOLDER
 This file is distributed under the same license as the PACKAGE package.

test/tools/test_msginit.rb

@@ -81,7 +81,7 @@ def pot_header(options)
     options = default_po_header_options.merge(options)
     package_name = options[:package_name] || default_package_name
     have_plural_forms = options[:have_plural_forms] || true
-    header = <<EOF
+    header = <<EOF.dup
 # SOME DESCRIPTIVE TITLE.
 # Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
 # This file is distributed under the same license as the PACKAGE package.

test/tools/test_msgmerge.rb

@@ -41,11 +41,11 @@ def merge
 
     class TestUpdate < self
       def test_msgstr
-        pot = <<-POT
+        pot = <<-POT.dup
 msgid "hello"
 msgstr ""
         POT
-        po = <<-PO
+        po = <<-PO.dup
 msgid "hello"
 msgstr "bonjour"
         PO
@@ -67,11 +67,11 @@ def merge(pot, po)
 
     class TestObosleteEntry < self
       def test_in_po
-        pot = <<-POT
+        pot = <<-POT.dup
 msgid "hello"
 msgstr ""
         POT
-        po = <<-PO
+        po = <<-PO.dup
 msgid "hello"
 msgstr "bonjour"