mirror of
https://github.com/Mercury-Language/mercury.git
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85a1eb5cf2
library/bitmap.m:
Add functions for accessing bytes in bitmaps as uint8 values.
Add predicates for setting bytes in bitmaps as uint8 values.
Add a det version of from_string/1.
Fix a typo in the description of is_empty/1.
tests/hard_coded/bitmap_bytes.{m,exp}:
Extend this test to cover uint8 access to bitmaps.
NEWS:
Announce the new predicates and functions.
75 lines
2.0 KiB
Mathematica
75 lines
2.0 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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%
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% Test byte oriented lookups in bitmaps.
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:- module bitmap_bytes.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is cc_multi.
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%---------------------------------------------------------------------------%
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%---------------------------------------------------------------------------%
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:- implementation.
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:- import_module bitmap.
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:- import_module exception.
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:- import_module list.
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:- import_module string.
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%---------------------------------------------------------------------------%
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main(!IO) :-
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BM0 = bitmap.init(0),
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do_bitmap_test(BM0, [-1, 0, 1], !IO),
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io.nl(!IO),
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BM1 = bitmap.init(24),
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do_bitmap_test(BM1, [-1, 0, 1, 2, 3, 4], !IO),
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io.nl(!IO),
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% With partial final byte.
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BM2 = bitmap.init(17),
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do_bitmap_test(BM2, [-1, 0, 1, 2, 3], !IO),
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io.nl(!IO),
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BM3 = det_from_string("<24:FF00FF>"),
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do_bitmap_test(BM3, [-1, 0, 1, 2, 3], !IO),
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io.nl(!IO),
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BM4 = det_from_string("<16:F00F>"),
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do_bitmap_test(BM4, [-1, 0, 1, 2], !IO).
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:- pred do_bitmap_test(bitmap::in, list(byte_index)::in,
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io::di, io::uo) is cc_multi.
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do_bitmap_test(BM, Indexes, !IO) :-
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io.format("Bitmap: %s\n", [s(to_byte_string(BM))], !IO),
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list.foldl(test_byte_lookup(BM), Indexes, !IO).
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:- pred test_byte_lookup(bitmap::in, byte_index::in, io::di, io::uo) is cc_multi.
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test_byte_lookup(BM, Index, !IO) :-
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io.format("^ byte(%d): ", [i(Index)], !IO),
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( try []
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Byte = BM ^ byte(Index)
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then
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io.write_int(Byte, !IO)
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catch bitmap_error(ByteError) ->
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io.write_string(ByteError, !IO)
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),
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io.nl(!IO),
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io.format("get_uint(%d): ", [i(Index)], !IO),
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( try []
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U8 = get_uint8(BM, Index)
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then
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io.write_uint8(U8, !IO)
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catch bitmap_error(U8Error) ->
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io.write_string(U8Error, !IO)
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),
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io.nl(!IO).
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