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https://github.com/Mercury-Language/mercury.git
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d2c3ede17d
library/string.m:
Define behaviour of string.replace_all on ill-formed code unit
sequences when the pattern is empty.
Implement that behaviour.
Use better variable names in documentation of string.replace and
string.replace_all.
tests/general/string_replace.exp:
tests/general/string_replace.exp2:
tests/general/string_replace.m:
Extend test case.
Update code style.
107 lines
3.1 KiB
Mathematica
107 lines
3.1 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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% The .exp file is for backends using UTF-8 string encoding.
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% The .exp2 file is for backends using UTF-16 string encoding.
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%
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%---------------------------------------------------------------------------%
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:- module string_replace.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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%---------------------------------------------------------------------------%
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:- implementation.
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:- import_module char.
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:- import_module int.
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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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Str = "aaa bbbb ccccc aaa",
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Str2 = "aßξ啕ßξ啕𐀀.",
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Smiley = "😀",
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Str3 = between(Smiley, 1, length(Smiley)) ++ Smiley,
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Tests = [
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% pattern not in string
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{"", "a", "bc"},
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{Str, "aab", "**"},
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{Str, "aaaa", "**"},
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% pattern is empty string
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{Str, "", "**"},
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{Str2, "", "**"},
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{Str3, "", "**"},
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% pattern in string
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{Str, "aaa", ""},
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{Str, "cc", "**"},
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{Str2, "ßξ", "**"},
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{Str2, "ßξ", "★★"},
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{Str2, "啕ßξ", "***"}
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],
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list.foldl(test_replace, Tests, !IO),
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list.foldl(test_replace_all, Tests, !IO).
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:- pred test_replace({string, string, string}::in, io::di, io::uo) is det.
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test_replace({Str, Pat, Subst}, !IO) :-
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io.write_string("string__replace(\"", !IO),
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write_string_debug(Str, !IO),
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io.write_string("\", \"", !IO),
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io.write_string(Pat, !IO),
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io.write_string("\", \"", !IO),
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io.write_string(Subst, !IO),
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io.write_string("\", Result) \n\t", !IO),
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( if string.replace(Str, Pat, Subst, Result) then
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io.write_string("\"", !IO),
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write_string_debug(Result, !IO),
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io.write_string("\"\n", !IO)
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else
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io.write_string("FAIL!\n", !IO)
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).
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:- pred test_replace_all({string, string, string}::in, io::di, io::uo) is det.
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test_replace_all({Str, Pat, Subst}, !IO) :-
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io.write_string("string__replace_all(\"", !IO),
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write_string_debug(Str, !IO),
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io.write_string("\", \"", !IO),
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io.write_string(Pat, !IO),
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io.write_string("\", \"", !IO),
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io.write_string(Subst, !IO),
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io.write_string("\", Result) \n\t", !IO),
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io.write_string("\"", !IO),
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string.replace_all(Str, Pat, Subst, Result),
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write_string_debug(Result, !IO),
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io.write_string("\"\n", !IO).
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:- pred write_string_debug(string::in, io::di, io::uo) is det.
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write_string_debug(S, !IO) :-
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write_string_debug_loop(S, 0, !IO).
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:- pred write_string_debug_loop(string::in, int::in, io::di, io::uo) is det.
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write_string_debug_loop(S, Index, !IO) :-
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( if string.index_next(S, Index, NextIndex, Char) then
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( if char.is_surrogate(Char) ; Char = '\ufffd' then
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unsafe_index_code_unit(S, Index, Code),
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io.format("[%#x]", [i(Code)], !IO)
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else
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io.write_char(Char, !IO)
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),
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write_string_debug_loop(S, NextIndex, !IO)
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else
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true
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).
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