% Regression test:
% 
% This test ensures that output from io__write is put on the
% correct output stream. All the functionality of io__write
% is tested so that an additional changes (such as adding
% a printf instead of a fprintf(current_stream, ...)) should
% be caught. 
%
% The Mercury compiler of 20 Dec 1996 failed to correctly
% run this test.
% 
% Author: trd

:- module write_reg1.
:- interface.
:- import_module io.

:- pred main(io__state::di, io__state::uo) is cc_multi.

:- implementation.

:- import_module list, int, univ, term, map, deconstruct.

:- pred test_builtins(io__output_stream::in, io__state::di, io__state::uo)
	is cc_multi.
:- pred test_discriminated(io__state::di, io__state::uo) is det.
:- pred test_polymorphism(io__state::di, io__state::uo) is det.
:- pred test_other(io__state::di, io__state::uo) is det.
:- pred newline(io__state::di, io__state::uo) is det.

:- type enum	--->	one	;	two	;	three.

:- type fruit	--->	apple(list(int))
		;	banana(list(enum)).

:- type thingie	--->	foo ; bar(int) ; bar(int, int) ; qux(int) ;
			quux(int) ; quuux(int, int) ; wombat ; 
			zoom(int) ; zap(int, float) ; zip(int, int) ;
			zop(float, float).

:- type poly(A, B)	--->	poly_one(A) ; poly_two(B) ; 
				poly_three(B, A, poly(B, A)).

:- type no_tag		---> 	qwerty(int).

main -->
	io__stderr_stream(StdErr),
	io__set_output_stream(StdErr, _StdOut),
	test_discriminated,
	test_polymorphism,
	test_builtins(StdErr), 
	test_other.

test_discriminated -->
	io__write_string("TESTING DISCRIMINATED UNIONS\n"),

		% test enumerations
	io__write(one), newline,
	io__write(two), newline,
	io__write(three), newline,

		% test simple tags
	io__write(apple([9,5,1])), newline,
	io__write(banana([three, one, two])), newline,

		% test complicated tags
	io__write(zop(3.3, 2.03)), newline,
	io__write(zip(3, 2)), newline,
	io__write(zap(3, -2.111)), newline,

		% test complicated constant
	io__write(wombat), newline,
	io__write(foo), newline,
	
	newline.	

test_polymorphism -->
	io__write_string("TESTING POLYMORPHISM\n"),
	io__write(poly_one([2399.3])), newline,
	io__write(poly_two(3)), newline,
	io__write(poly_three(3.33, 4, poly_one(9.11))), newline,

	newline.

test_builtins(StdErr) -->
	io__write_string("TESTING BUILTINS\n"),

		% test strings
 	io__write(""), newline,
 	io__write("Hello, world\n"), newline,
 	io__write("Foo%sFoo"), newline,
 	io__write(""""), newline,	% interesting - prints """ of course

		% test characters
	io__write('a'), newline,
	io__write('&'), newline,

		% test floats
	io__write(3.14159), newline,
	io__write(11.28324983E-22), newline,
	io__write(22.3954899E22), newline,

		% test integers
	io__write(-65), newline,
	io__write(4), newline,

		% test univ.
	{ type_to_univ(["hi! I'm a univ!"], Univ) }, 
	io__write(Univ), newline,
	
		% test predicates	
	io__write(newline), newline,
	io__write(StdErr, include_details_cc, newline), newline,

	newline.

	% Note: testing abstract types is always going to have results
	% that are dependent on the implementation. If someone changes
	% the implementation, the results of this test can change.

test_other -->
	io__write_string("TESTING OTHER TYPES\n"),
	{ term__init_var_supply(VarSupply) },
	{ term__create_var(VarSupply, Var, NewVarSupply) },
	io__write(Var), newline,
	io__write(VarSupply), newline,
	io__write(NewVarSupply), newline,

		% presently, at least, map is an equivalence and
		% an abstract type.
	{ map__init(Map) },
	io__write(Map), newline,

		% a no tag type 
	io__write(qwerty(4)), newline,

	newline.

newline -->
	io__write_char('\n').