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%-----------------------------------------------------------------------------%
% Copyright (C) 1994-1998 The University of Melbourne.
% This file may only be copied under the terms of the GNU General
% Public License - see the file COPYING in the Mercury distribution.
%-----------------------------------------------------------------------------%
:- module globals.
% Main author: conway, bromage.
% This module exports the `globals' type and associated access predicates.
% The globals type is used to collect together all the various data
% that would be global variables in an imperative language.
% This global data is stored in the io__state.
%-----------------------------------------------------------------------------%
:- interface.
:- import_module options, diff_out.
:- import_module getopt, bool, int, string, list.
:- type globals.
%-----------------------------------------------------------------------------%
% Access predicates for the `globals' structure.
:- pred globals__init(option_table::in, globals::out) is det.
:- pred globals__get_options(globals::in, option_table::out) is det.
:- pred globals__set_options(globals::in, option_table::in, globals::out)
is det.
:- pred globals__get_output_style(globals::in, diff_out__output_style::out)
is det.
:- pred globals__set_output_style(globals::in, diff_out__output_style::in,
globals::out) is det.
:- pred globals__lookup_option(globals::in, option::in, option_data::out)
is det.
:- pred globals__lookup_bool_option(globals, option, bool).
:- mode globals__lookup_bool_option(in, in, out) is det.
:- pred globals__lookup_int_option(globals::in, option::in, int::out) is det.
:- pred globals__lookup_string_option(globals::in, option::in, string::out)
is det.
:- pred globals__lookup_accumulating_option(globals::in, option::in,
list(string)::out) is det.
%-----------------------------------------------------------------------------%
% Access predicates for storing a `globals' structure in the
% io__state using io__set_globals and io__get_globals.
:- pred globals__io_init(option_table::in,
io__state::di, io__state::uo) is det.
:- pred globals__io_get_globals(globals::out, io__state::di, io__state::uo)
is det.
:- pred globals__io_set_globals(globals::in, io__state::di, io__state::uo)
is det.
:- pred globals__io_get_output_style(diff_out__output_style::out,
io__state::di, io__state::uo) is det.
:- pred globals__io_set_output_style(diff_out__output_style::in,
io__state::di, io__state::uo) is det.
:- pred globals__io_lookup_option(option::in, option_data::out,
io__state::di, io__state::uo) is det.
:- pred globals__io_set_option(option::in, option_data::in,
io__state::di, io__state::uo) is det.
:- pred globals__io_lookup_bool_option(option, bool, io__state, io__state).
:- mode globals__io_lookup_bool_option(in, out, di, uo) is det.
:- pred globals__io_lookup_int_option(option::in, int::out,
io__state::di, io__state::uo) is det.
:- pred globals__io_lookup_string_option(option::in, string::out,
io__state::di, io__state::uo) is det.
:- pred globals__io_lookup_accumulating_option(option::in, list(string)::out,
io__state::di, io__state::uo) is det.
%-----------------------------------------------------------------------------%
%-----------------------------------------------------------------------------%
:- implementation.
:- import_module map, std_util, io, require.
%-----------------------------------------------------------------------------%
:- type globals
---> globals(
option_table, % Current options
diff_out__output_style % Current module name
).
globals__init(Options, globals(Options, OutputType)) :-
diff_out__default_output_style(OutputType).
globals__get_options(globals(Options, _), Options).
globals__set_options(globals(_, Scanner), Options, globals(Options, Scanner)).
globals__get_output_style(globals(_, Output), Output).
globals__set_output_style(globals(A, _), Output, globals(A, Output)).
globals__lookup_option(Globals, Option, OptionData) :-
globals__get_options(Globals, OptionTable),
map__lookup(OptionTable, Option, OptionData).
%-----------------------------------------------------------------------------%
globals__lookup_bool_option(Globals, Option, Value) :-
globals__lookup_option(Globals, Option, OptionData),
( OptionData = bool(Bool) ->
Value = Bool
;
error("globals__lookup_bool_option: invalid bool option")
).
globals__lookup_string_option(Globals, Option, Value) :-
globals__lookup_option(Globals, Option, OptionData),
( OptionData = string(String) ->
Value = String
;
error("globals__lookup_string_option: invalid string option")
).
globals__lookup_int_option(Globals, Option, Value) :-
globals__lookup_option(Globals, Option, OptionData),
( OptionData = int(Int) ->
Value = Int
;
error("globals__lookup_int_option: invalid int option")
).
globals__lookup_accumulating_option(Globals, Option, Value) :-
globals__lookup_option(Globals, Option, OptionData),
( OptionData = accumulating(Accumulating) ->
Value = Accumulating
;
error("globals__lookup_accumulating_option: invalid accumulating option")
).
%-----------------------------------------------------------------------------%
%-----------------------------------------------------------------------------%
globals__io_init(Options) -->
{ globals__init(Options, Globals) },
globals__io_set_globals(Globals).
globals__io_get_globals(Globals) -->
io__get_globals(UnivGlobals),
{
univ_to_type(UnivGlobals, Globals0)
->
Globals = Globals0
;
error("globals__io_get_globals: univ_to_type failed")
}.
globals__io_set_globals(Globals) -->
{ unsafe_promise_unique(Globals, UniqGlobals) },
{ type_to_univ(UniqGlobals, UnivGlobals) },
io__set_globals(UnivGlobals).
%-----------------------------------------------------------------------------%
globals__io_lookup_option(Option, OptionData) -->
globals__io_get_globals(Globals),
{ globals__get_options(Globals, OptionTable) },
{ map__lookup(OptionTable, Option, OptionData) }.
globals__io_set_option(Option, OptionData) -->
globals__io_get_globals(Globals0),
{ globals__get_options(Globals0, OptionTable0) },
{ map__set(OptionTable0, Option, OptionData, OptionTable) },
{ globals__set_options(Globals0, OptionTable, Globals) },
globals__io_set_globals(Globals).
%-----------------------------------------------------------------------------%
globals__io_lookup_bool_option(Option, Value) -->
globals__io_get_globals(Globals),
{ globals__lookup_bool_option(Globals, Option, Value) }.
globals__io_lookup_int_option(Option, Value) -->
globals__io_get_globals(Globals),
{ globals__lookup_int_option(Globals, Option, Value) }.
globals__io_lookup_string_option(Option, Value) -->
globals__io_get_globals(Globals),
{ globals__lookup_string_option(Globals, Option, Value) }.
globals__io_lookup_accumulating_option(Option, Value) -->
globals__io_get_globals(Globals),
{ globals__lookup_accumulating_option(Globals, Option, Value) }.
%-----------------------------------------------------------------------------%
globals__io_get_output_style(Output) -->
globals__io_get_globals(Globals),
{ globals__get_output_style(Globals, Output) }.
globals__io_set_output_style(Output) -->
globals__io_get_globals(Globals0),
{ globals__set_output_style(Globals0, Output, Globals) },
globals__io_set_globals(Globals).
%-----------------------------------------------------------------------------%
%-----------------------------------------------------------------------------%
|
