Commonize Ruby code.

Author: gemmaro

lib/gettextpo.rb

@@ -17,57 +17,4 @@
 
 require_relative "gettextpo/version"
 require_relative "gettextpo/gettextpo"
-
-# The main entrypoints to parse PO files are GettextPO::File.new and
-# GettextPO::File.read.
-#
-# == Error handling
-#
-# There are two kinds of errors in this gem.  The first is for
-# exception handlings of libgettextpo.  The second is regular error
-# raising from this gem.
-#
-# Some functions takes exception error handling paramters like
-# +xerror+ and +xerror2+.  These parameters expect +Proc+ object which
-# takes several parameters.  See also the description of
-# GettextPO::File.read method.  The +severity+ parameter among these
-# parameters is either SEVERITY_WARNING, SEVERITY_ERROR, or
-# SEVERITY_FATAL_ERROR.
-#
-# This gem normally raises +GettextPO::Error+ object, except for the
-# standard ones, +StopIteration+ for example.
-#
-module GettextPO
-  class Error < StandardError; end # :nodoc:
-
-  # This class doesn't provide the +new+ class method.  Refre to
-  # GettextPO::MessageIterator#next or
-  # GettextPO::MessageIterator#insert.
-  class Message
-    private_class_method :new
-  end
-
-  # This class doesn't provide the +new+ class method.  See also
-  # GettextPO::File#message_iterator.
-  class MessageIterator
-    private_class_method :new
-
-    def each # yields: message
-      while true
-        begin
-          yield self.next
-        rescue StopIteration
-          return self
-        end
-      end
-    end
-
-    include Enumerable
-  end
-
-  # This class doesn't provide the +new+ class method.  See also
-  # GettextPO::Message#filepos.
-  class FilePos
-    private_class_method :new
-  end
-end
+require_relative "../mrblib/mrb_gettextpo_common"

mrblib/mrb_gettextpo.rb

@@ -37,31 +37,7 @@ def check_all(xerror: nil, xerror2: nil)
     end
   end
 
-  class MessageIterator
-    def self.new
-      raise NoMethodError,
-            "please use other methods instead, such as GettextPO::File#message_iterator"
-    end
-
-    def each # yields: message
-      while true
-        begin
-          yield self.next
-        rescue StopIteration
-          return self
-        end
-      end
-    end
-
-    include Enumerable
-  end
-
   class Message
-    def self.new
-      raise NoMethodError,
-            "please use other methods instead, such as GettextPO::MessageIterator#next"
-    end
-
     # It seems that calling Proc with keyword arguments is not yet
     # supported.
     alias original_check_all check_all
@@ -79,11 +55,4 @@ def check_format(xerror: nil, xerror2: nil)
                             xerror2: xerror2 && Proc.new { |kwargs| xerror2.(**kwargs) })
     end
   end
-
-  class FilePos
-    def self.new
-      raise NoMethodError,
-            "please use other methods instead, such as GettextPO::Message#filepos"
-    end
-  end
 end

mrblib/mrb_gettextpo_common.rb

@@ -0,0 +1,79 @@
+#--
+# Copyright (C) 2026  gemmaro
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#++
+
+# The main entrypoints to parse PO files are GettextPO::File.new and
+# GettextPO::File.read.
+#
+# == Error handling
+#
+# There are two kinds of errors in this gem.  The first is for
+# exception handlings of libgettextpo.  The second is regular error
+# raising from this gem.
+#
+# Some functions takes exception error handling paramters like
+# +xerror+ and +xerror2+.  These parameters expect +Proc+ object which
+# takes several parameters.  See also the description of
+# GettextPO::File.read method.  The +severity+ parameter among these
+# parameters is either SEVERITY_WARNING, SEVERITY_ERROR, or
+# SEVERITY_FATAL_ERROR.
+#
+# This gem normally raises +GettextPO::Error+ object, except for the
+# standard ones, +StopIteration+ for example.
+#
+module GettextPO
+  Error = Class.new(StandardError) # :nodoc:
+
+  # This class doesn't provide the +new+ class method.  See also
+  # GettextPO::File#message_iterator.
+  class MessageIterator
+    def self.new
+      raise NoMethodError,
+            "please use other methods instead, such as GettextPO::File#message_iterator"
+    end
+
+    def each # yields: message
+      while true
+        begin
+          yield self.next
+        rescue StopIteration
+          return self
+        end
+      end
+    end
+
+    include Enumerable
+  end
+
+  # This class doesn't provide the +new+ class method.  Refre to
+  # GettextPO::MessageIterator#next or
+  # GettextPO::MessageIterator#insert.
+  class Message
+    def self.new
+      raise NoMethodError,
+            "please use other methods instead, such as GettextPO::MessageIterator#next"
+    end
+  end
+
+  # This class doesn't provide the +new+ class method.  See also
+  # GettextPO::Message#filepos.
+  class FilePos
+    def self.new
+      raise NoMethodError,
+            "please use other methods instead, such as GettextPO::Message#filepos"
+    end
+  end
+end