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f8c67929de
library/array2d.m:
Add lookup and unsafe_lookup, in both function and predicate forms,
as alternatives to rafe's ^elem notation.
Use meaningful variable names in both code and documentation.
For example, use NumRows and NumColumns instead of M and N.
Replace the implementation of the function that converts a 2d array
back to lists. The new implementation has one loop over rows and one
loop over columns, while the old one had a single loop that did
both jobs. The new one returns [] (meaning no rows) for a 0x0 array,
while the old returned [[]] (meaning one row with no columns).
NEWS:
Announce the changes.
tests/hard_coded/test_array2d.m:
Use a lookup instead of ^elem.
tests/hard_coded/test_array2d.exp:
Expect the updated output from lists. Expect any exceptions to come
from lookup functions, not ^elem functions (since the latter now
just call the former).
132 lines
3.9 KiB
Mathematica
132 lines
3.9 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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% test_array2d.m
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% Ralph Becket <rafe@cs.mu.oz.au>
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% Tue Jan 21 12:38:05 EST 2003
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%---------------------------------------------------------------------------%
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:- module test_array2d.
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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 array2d.
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:- import_module exception.
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:- import_module int.
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:- import_module list.
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:- import_module pprint.
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:- import_module string.
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%---------------------------------------------------------------------------%
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main(!IO) :-
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Empty = array2d([]) `with_type` array2d(int),
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write_array2d("Empty", Empty, !IO),
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io.nl(!IO),
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One = array2d([[1]]),
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write_array2d("One", One, !IO),
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write_array2d_elem("One", One, 0, 0, !IO),
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io.nl(!IO),
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Two = array2d([[1, 0], [0, 2]]),
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write_array2d("Two", Two, !IO),
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write_array2d_elem("Two", Two, 0, 0, !IO),
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write_array2d_elem("Two", Two, 0, 1, !IO),
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write_array2d_elem("Two", Two, 1, 0, !IO),
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write_array2d_elem("Two", Two, 1, 1, !IO),
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io.nl(!IO),
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( if array2d.is_empty(Empty) then
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io.write_string("Empty is empty\n", !IO)
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else
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io.write_string("Empty is not empty\n", !IO)
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),
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( if array2d.is_empty(One) then
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io.write_string("One is empty\n", !IO)
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else
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io.write_string("One is not empty\n", !IO)
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),
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( if array2d.is_empty(Two) then
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io.write_string("Two is empty\n", !IO)
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else
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io.write_string("Two is not empty\n", !IO)
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),
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io.nl(!IO),
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Two_a = Two ^ elem(0, 1) := 3,
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write_array2d("Two_a", Two_a, !IO),
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io.nl(!IO),
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Two_b = Two_a ^ elem(1, 0) := 4,
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write_array2d("Two_b", Two_b, !IO),
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io.nl(!IO),
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Zeroes = array2d.init(3, 3, 0),
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write_array2d("Zeroes", Zeroes, !IO),
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io.nl(!IO),
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write_array2d_elem("Empty", Empty, 0, 0, !IO),
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write_array2d_elem("Zeroes", Zeroes, -1, 0, !IO),
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write_array2d_elem("Zeroes", Zeroes, 0, -1, !IO),
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write_array2d_elem("Zeroes", Zeroes, -1, -1, !IO),
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write_array2d_elem("Zeroes", Zeroes, 3, 0, !IO),
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write_array2d_elem("Zeroes", Zeroes, 0, 3, !IO),
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write_array2d_elem("Zeroes", Zeroes, 3, 3, !IO),
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io.nl(!IO),
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FourSix = array2d([
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[11, 12, 13, 14, 15, 16],
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[21, 22, 23, 24, 25, 26],
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[31, 32, 33, 34, 35, 36],
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[41, 42, 43, 44, 45, 46]
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]),
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FourSixLists = lists(FourSix),
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list.foldl(io.write_line, FourSixLists, !IO),
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true.
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%---------------------------------------------------------------------------%
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:- pred write_array2d(string, array2d(T), io, io).
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:- mode write_array2d(in, array2d_ui, di, uo) is det.
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write_array2d(Name, Table, !IO) :-
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io.format("%s =\n%s\n", [s(Name), s(test_array2d.string(Table))], !IO).
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%---------------------------------------------------------------------------%
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:- pred write_array2d_elem(string, array2d(T), int, int, io, io).
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:- mode write_array2d_elem(in, array2d_ui, in, in, di, uo) is cc_multi.
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write_array2d_elem(Name, Table, R, C, !IO) :-
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io.format("%s ^ elem(%d, %d) = ", [s(Name), i(R), i(C)], !IO),
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try(array2d.lookup(Table, R, C), Result),
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(
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Result = succeeded(Elem),
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io.print(Elem, !IO)
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;
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Result = exception(_),
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io.print(Result, !IO)
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),
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io.nl(!IO).
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%---------------------------------------------------------------------------%
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:- func string(array2d(T)) = string.
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:- mode string(array2d_ui) = out is det.
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string(T) =
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to_string(80, brackets(nest(1, separated(to_doc, line, lists(T))))).
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%---------------------------------------------------------------------------%
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