xgettext: Refactor the formatstring code.
Use "regions" instead of "contexts" to keep track of the flags and data that is
specific to a (usually parenthesized) block in an input file.
* gettext-tools/src/xg-arglist-context.h (null_context, passthrough_context,
inherited_context): Remove declarations.
(struct formatstring_region_ty, struct flag_region_ty): New types.
(null_context_region, inheriting_region, ref_region, unref_region): New
declarations.
(assign_region, assign_new_region): New macros.
* gettext-tools/src/xg-arglist-context.c: Include attribute.h.
(null_context): Make static.
(passthrough_context): Make static. Mark as MAYBE_UNUSED.
(inherited_context): Remove function.
(the_null_context_region): New variable.
(null_context_region, inheriting_region, ref_region, unref_region): New
functions.
* gettext-tools/src/xg-arglist-parser.h (struct partial_call,
arglist_parser_remember, arglist_parser_remember_msgctxt): Use
'flag_region_ty *' instead of flag_context_ty.
* gettext-tools/src/xg-arglist-parser.c (arglist_parser_alloc,
arglist_parser_clone, arglist_parser_remember): Update.
(arglist_parser_remember_msgctxt, arglist_parser_done): Use 'flag_region_ty *'
instead of flag_context_ty.
* gettext-tools/src/xg-message.h (remember_a_message,
remember_a_message_plural): Use 'flag_region_ty *' instead of flag_context_ty.
* gettext-tools/src/xg-message.c (set_format_flags_from_context,
remember_a_message, remember_a_message_plural): Use 'flag_region_ty *' instead
of flag_context_ty.
* gettext-tools/src/x-awk.c (extract_parenthesized): Use 'flag_region_ty *'
instead of flag_context_ty.
(extract_awk): Update.
* gettext-tools/src/x-c.c (extract_parenthesized): Use 'flag_region_ty *'
instead of flag_context_ty.
(extract_whole_file): Update.
* gettext-tools/src/x-csharp.c (extract_parenthesized): Use 'flag_region_ty *'
instead of flag_context_ty.
(extract_csharp): Update.
* gettext-tools/src/x-desktop.c (extract_desktop_handle_pair): Update.
* gettext-tools/src/x-elisp.c (read_object): Use 'flag_region_ty *' instead of
flag_context_ty.
(extract_elisp): Update.
* gettext-tools/src/x-java.c (extract_parenthesized): Use 'flag_region_ty *'
instead of flag_context_ty.
(extract_java): Update.
* gettext-tools/src/x-javascript.c (extract_balanced): Use 'flag_region_ty *'
instead of flag_context_ty.
(extract_javascript): Update.
* gettext-tools/src/x-librep.c (read_object): Use 'flag_region_ty *' instead of
flag_context_ty.
(extract_librep): Update.
* gettext-tools/src/x-lisp.c (read_object): Use 'flag_region_ty *' instead of
flag_context_ty.
(extract_lisp): Update.
* gettext-tools/src/x-lua.c (extract_balanced): Use 'flag_region_ty *' instead
of flag_context_ty.
(extract_lua): Update.
* gettext-tools/src/x-perl.c (extract_variable, interpolate_keywords,
extract_balanced): Use 'flag_region_ty *' instead of flag_context_ty.
(extract_perl): Update.
* gettext-tools/src/x-php.c (extract_balanced): Use 'flag_region_ty *' instead
of flag_context_ty.
(extract_php): Update.
* gettext-tools/src/x-python.c (extract_balanced): Use 'flag_region_ty *'
instead of flag_context_ty.
(extract_python): Update.
* gettext-tools/src/x-rst.c (extract_rst, extract_rsj): Update.
* gettext-tools/src/x-scheme.c (read_object): Use 'flag_region_ty *' instead of
flag_context_ty.
(extract_scheme): Update.
* gettext-tools/src/x-sh.c (read_word, read_command, read_command_list): Use
'flag_region_ty *' instead of flag_context_ty.
(extract_sh): Update.
* gettext-tools/src/x-smalltalk.c (extract_smalltalk): Update.
* gettext-tools/src/x-tcl.c (accumulate_word, read_word, read_command,
read_command_list): Use 'flag_region_ty *' instead of flag_context_ty.
(extract_tcl): Update.
* gettext-tools/src/x-vala.c (extract_balanced): Use 'flag_region_ty *' instead
of flag_context_ty.
(extract_vala): Update.
* gettext-tools/src/x-ycp.c (extract_parenthesized): Use 'flag_region_ty *'
instead of flag_context_ty.
(extract_ycp): Update.
* gettext-tools/src/xgettext.c (xgettext_its_extract_callback): Update.
