mirror of
https://github.com/Mercury-Language/mercury.git
synced 2026-04-21 04:13:46 +00:00
a52b094e25
library/uint8.m:
library/uint16.m:
library/uint64.m:
Add functions for setting, clearing, flipping and testing
the individual bits of a uint8, uint16 and uint64 values.
NEWS:
Announce the new functions.
tests/hard_coded/Mmakefile:
tests/hard_coded/bit_access_uint{8,16,64}.{m,exp}:
Add a test case.
178 lines
4.7 KiB
Mathematica
178 lines
4.7 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ft=mercury ts=4 sw=4 et wm=0 tw=0
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%---------------------------------------------------------------------------%
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% Test look ups and setting of individual bits for uint8s.
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:- module bit_access_uint8.
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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 uint8.
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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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run_modify_test(uint8.set_bit, "set_bit", !IO),
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io.nl(!IO),
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run_modify_test(uint8.clear_bit, "clear_bit", !IO),
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io.nl(!IO),
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run_modify_test(uint8.flip_bit, "flip_bit", !IO),
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io.nl(!IO),
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run_value_test(uint8.bit_is_set, "bit_is_set", !IO),
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io.nl(!IO),
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run_value_test(uint8.bit_is_clear, "bit_is_clear", !IO),
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io.nl(!IO).
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%---------------------------------------------------------------------------%
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:- pred run_modify_test((func(uint8, uint) = uint8)::in, string::in,
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io::di, io::uo) is cc_multi.
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run_modify_test(Func, Desc, !IO) :-
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io.format("*** Test operation '%s' ***\n\n", [s(Desc)], !IO),
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list.foldl(run_modify_on_input(Func, Desc), modify_numbers, !IO).
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:- pred run_modify_on_input((func(uint8, uint) = uint8)::in, string::in,
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uint8::in, io::di, io::uo) is cc_multi.
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run_modify_on_input(Func, Desc, U, !IO) :-
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list.foldl(run_modify_on_input_at_index(Func, Desc, U), bit_indexes, !IO).
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:- pred run_modify_on_input_at_index((func(uint8, uint) = uint8)::in, string::in,
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uint8::in, uint::in, io::di, io::uo) is cc_multi.
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run_modify_on_input_at_index(Func, Desc, U, I, !IO) :-
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( try []
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Result0 = Func(U, I)
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then
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ResultStr = to_binary_string_lz(Result0)
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catch_any _ ->
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ResultStr = "<<exception>>"
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),
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io.format("%s(%s, %u) = %s\n",
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[s(Desc),
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s(to_binary_string_lz(U)),
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u(I),
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s(ResultStr)], !IO).
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%---------------------------------------------------------------------------%
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:- pred run_value_test(pred(uint8, uint)::in(pred(in, in) is semidet),
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string::in, io::di, io::uo) is cc_multi.
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run_value_test(Pred, Desc, !IO) :-
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io.format("*** Test operation '%s' ***\n\n", [s(Desc)], !IO),
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list.foldl(run_value_on_input(Pred, Desc), test_numbers, !IO).
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:- pred run_value_on_input(pred(uint8, uint)::in(pred(in, in) is semidet),
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string::in, uint8::in, io::di, io::uo) is cc_multi.
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run_value_on_input(Pred, Desc, U, !IO) :-
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list.foldl(run_value_on_input_at_index(Pred, Desc, U), bit_indexes, !IO).
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:- pred run_value_on_input_at_index(pred(uint8, uint)::in(pred(in, in) is semidet),
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string::in, uint8::in, uint::in, io::di, io::uo) is cc_multi.
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run_value_on_input_at_index(Pred, Desc, U, I, !IO) :-
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( try []
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Pred(U, I)
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then
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ResultStr = "true"
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else
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ResultStr = "false"
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catch_any _ ->
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ResultStr = "<<exception>>"
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),
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io.format("%s(%s, %u) ==> %s\n",
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[s(Desc),
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s(to_binary_string_lz(U)),
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u(I),
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s(ResultStr)], !IO).
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%---------------------------------------------------------------------------%
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:- func modify_numbers = list(uint8).
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modify_numbers = [
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0_u8,
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255_u8
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].
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:- func test_numbers = list(uint8).
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test_numbers = [
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0_u8,
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1_u8,
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2_u8,
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8_u8,
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127_u8,
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255_u8
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].
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:- func bit_indexes = list(uint).
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bit_indexes = [
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0_u,
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1_u,
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2_u,
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3_u,
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4_u,
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5_u,
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6_u,
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7_u,
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8_u
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].
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%---------------------------------------------------------------------------%
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:- func to_binary_string_lz(uint8::in) = (string::uo) is det.
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:- pragma foreign_proc("C",
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to_binary_string_lz(U::in) = (S::uo),
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[will_not_call_mercury, promise_pure, thread_safe, will_not_modify_trail],
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"
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int i = 8;
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MR_allocate_aligned_string_msg(S, 8, MR_ALLOC_ID);
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S[8] = '\\0';
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while (i > 0) {
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i--;
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S[i] = (U & 1) ? '1' : '0';
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U = U >> 1;
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}
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").
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:- pragma foreign_proc("C#",
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to_binary_string_lz(U::in) = (S::uo),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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S = System.Convert.ToString(U, 2).PadLeft(8, '0');
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").
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:- pragma foreign_proc("Java",
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to_binary_string_lz(U::in) = (S::uo),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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S = java.lang.String.format(""%8s"",
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java.lang.Integer.toBinaryString(U & 0xff)).replace(' ', '0');
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").
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%---------------------------------------------------------------------------%
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:- end_module bit_access_uint8.
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%---------------------------------------------------------------------------%
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