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authorJosé Valim <jose.valim@plataformatec.com.br>2017-05-19 16:06:08 +0200
committerJosé Valim <jose.valim@plataformatec.com.br>2017-05-22 15:08:31 +0200
commite1370f924df65e72843b5f81400230e1c2591485 (patch)
tree73babac731e86c0903ef584d14749e1777d5f54b /lib/stdlib/src
parent166d11bb8cbb386dfab4fef37f6f231ac2689b61 (diff)
downloadotp-e1370f924df65e72843b5f81400230e1c2591485.tar.gz
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Return error tuple on unicode normalization functions
Prior to this patch, the normalization functions in the unicode module would raise a function clause error for non-utf8 binaries. This patch changes it so it returns {error, SoFar, Invalid} as characters_to_binary and characters_to_list does in the unicode module. Note string:next_codepoint/1 and string:next_grapheme had to be changed accordingly and also return an error tuple.
Diffstat (limited to 'lib/stdlib/src')
-rw-r--r--lib/stdlib/src/string.erl14
-rw-r--r--lib/stdlib/src/unicode.erl109
2 files changed, 73 insertions, 50 deletions
diff --git a/lib/stdlib/src/string.erl b/lib/stdlib/src/string.erl
index 17135dd64a..6f7009b5d9 100644
--- a/lib/stdlib/src/string.erl
+++ b/lib/stdlib/src/string.erl
@@ -486,12 +486,14 @@ find(String, SearchPattern, trailing) ->
%% Fetch first codepoint and return rest in tail
-spec next_grapheme(String::unicode:chardata()) ->
- maybe_improper_list(grapheme_cluster(),unicode:chardata()).
+ maybe_improper_list(grapheme_cluster(),unicode:chardata()) |
+ {error,unicode:chardata()}.
next_grapheme(CD) -> unicode_util:gc(CD).
%% Fetch first grapheme cluster and return rest in tail
-spec next_codepoint(String::unicode:chardata()) ->
- maybe_improper_list(char(),unicode:chardata()).
+ maybe_improper_list(char(),unicode:chardata()) |
+ {error,unicode:chardata()}.
next_codepoint(CD) -> unicode_util:cp(CD).
%% Internals
@@ -508,7 +510,7 @@ equal_1(A0,B0) ->
case {unicode_util:cp(A0), unicode_util:cp(B0)} of
{[CP|A],[CP|B]} -> equal_1(A,B);
{[], []} -> true;
- _ -> false
+ {L1,L2} when is_list(L1), is_list(L2) -> false
end.
equal_nocase(A, A) -> true;
@@ -517,7 +519,7 @@ equal_nocase(A0, B0) ->
unicode_util:cp(unicode_util:casefold(B0))} of
{[CP|A],[CP|B]} -> equal_nocase(A,B);
{[], []} -> true;
- _ -> false
+ {L1,L2} when is_list(L1), is_list(L2) -> false
end.
equal_norm(A, A, _Norm) -> true;
@@ -526,7 +528,7 @@ equal_norm(A0, B0, Norm) ->
unicode_util:cp(unicode_util:Norm(B0))} of
{[CP|A],[CP|B]} -> equal_norm(A,B, Norm);
{[], []} -> true;
- _ -> false
+ {L1,L2} when is_list(L1), is_list(L2) -> false
end.
equal_norm_nocase(A, A, _Norm) -> true;
@@ -535,7 +537,7 @@ equal_norm_nocase(A0, B0, Norm) ->
unicode_util:cp(unicode_util:casefold(unicode_util:Norm(B0)))} of
{[CP|A],[CP|B]} -> equal_norm_nocase(A,B, Norm);
{[], []} -> true;
- _ -> false
+ {L1,L2} when is_list(L1), is_list(L2) -> false
end.
reverse_1(CD, Acc) ->
diff --git a/lib/stdlib/src/unicode.erl b/lib/stdlib/src/unicode.erl
index aa1da400ce..fbe8a94074 100644
--- a/lib/stdlib/src/unicode.erl
+++ b/lib/stdlib/src/unicode.erl
@@ -250,89 +250,110 @@ encoding_to_bom(latin1) ->
-define(GC_N, 200). %% arbitrary number
%% Canonical decompose string to list of chars
--spec characters_to_nfd_list(chardata()) -> [char()].
+-spec characters_to_nfd_list(chardata()) -> [char()] | {error, [char()], chardata()}.
characters_to_nfd_list(CD) ->
+ characters_to_nfd_list(CD, []).
+characters_to_nfd_list(CD, Acc) ->
case unicode_util:nfd(CD) of
- [GC|Str] when is_list(GC) -> GC++characters_to_nfd_list(Str);
- [CP|Str] -> [CP|characters_to_nfd_list(Str)];
- [] -> []
+ [GC|Str] when is_list(GC) -> characters_to_nfd_list(Str, lists:reverse(GC, Acc));
+ [CP|Str] -> characters_to_nfd_list(Str, [CP | Acc]);
+ [] -> lists:reverse(Acc);
+ {error,Error} -> {error, lists:reverse(Acc), Error}
end.
--spec characters_to_nfd_binary(chardata()) -> unicode_binary().
+-spec characters_to_nfd_binary(chardata()) -> unicode_binary() | {error, unicode_binary(), chardata()}.
characters_to_nfd_binary(CD) ->
- list_to_binary(characters_to_nfd_binary(CD, ?GC_N, [])).
+ characters_to_nfd_binary(CD, ?GC_N, [], []).
-characters_to_nfd_binary(CD, N, Row) when N > 0 ->
+characters_to_nfd_binary(CD, N, Row, Acc) when N > 0 ->
case unicode_util:nfd(CD) of
- [GC|Str] -> characters_to_nfd_binary(Str, N-1, [GC|Row]);
- [] -> [characters_to_binary(lists:reverse(Row))]
+ [GC|Str] -> characters_to_nfd_binary(Str, N-1, [GC|Row], Acc);
+ [] -> acc_to_binary(prepend_row_to_acc(Row, Acc));
+ {error, Error} -> {error, acc_to_binary(prepend_row_to_acc(Row, Acc)), Error}
end;
-characters_to_nfd_binary(CD, _, Row) ->
- [characters_to_binary(lists:reverse(Row))|characters_to_nfd_binary(CD,?GC_N,[])].
+characters_to_nfd_binary(CD, _, Row, Acc) ->
+ characters_to_nfd_binary(CD, ?GC_N, [], prepend_row_to_acc(Row, Acc)).
%% Compability Canonical decompose string to list of chars.
--spec characters_to_nfkd_list(chardata()) -> [char()].
+-spec characters_to_nfkd_list(chardata()) -> [char()] | {error, [char()], chardata()}.
characters_to_nfkd_list(CD) ->
+ characters_to_nfkd_list(CD, []).
+characters_to_nfkd_list(CD, Acc) ->
case unicode_util:nfkd(CD) of
- [GC|Str] when is_list(GC) -> GC++characters_to_nfkd_list(Str);
- [CP|Str] -> [CP|characters_to_nfkd_list(Str)];
- [] -> []
+ [GC|Str] when is_list(GC) -> characters_to_nfkd_list(Str, lists:reverse(GC, Acc));
+ [CP|Str] -> characters_to_nfkd_list(Str, [CP | Acc]);
+ [] -> lists:reverse(Acc);
+ {error,Error} -> {error, lists:reverse(Acc), Error}
end.
--spec characters_to_nfkd_binary(chardata()) -> unicode_binary().
+-spec characters_to_nfkd_binary(chardata()) -> unicode_binary() | {error, unicode_binary(), chardata()}.
characters_to_nfkd_binary(CD) ->
- list_to_binary(characters_to_nfkd_binary(CD, ?GC_N, [])).
+ characters_to_nfkd_binary(CD, ?GC_N, [], []).
-characters_to_nfkd_binary(CD, N, Row) when N > 0 ->
+characters_to_nfkd_binary(CD, N, Row, Acc) when N > 0 ->
case unicode_util:nfkd(CD) of
- [GC|Str] -> characters_to_nfkd_binary(Str, N-1, [GC|Row]);
- [] -> [characters_to_binary(lists:reverse(Row))]
+ [GC|Str] -> characters_to_nfkd_binary(Str, N-1, [GC|Row], Acc);
+ [] -> acc_to_binary(prepend_row_to_acc(Row, Acc));
+ {error, Error} -> {error, acc_to_binary(prepend_row_to_acc(Row, Acc)), Error}
end;
-characters_to_nfkd_binary(CD, _, Row) ->
- [characters_to_binary(lists:reverse(Row))|characters_to_nfkd_binary(CD,?GC_N,[])].
+characters_to_nfkd_binary(CD, _, Row, Acc) ->
+ characters_to_nfkd_binary(CD, ?GC_N, [], prepend_row_to_acc(Row, Acc)).
%% Canonical compose string to list of chars
--spec characters_to_nfc_list(chardata()) -> [char()].
+-spec characters_to_nfc_list(chardata()) -> [char()] | {error, [char()], chardata()}.
characters_to_nfc_list(CD) ->
+ characters_to_nfc_list(CD, []).
+characters_to_nfc_list(CD, Acc) ->
case unicode_util:nfc(CD) of
- [CPs|Str] when is_list(CPs) -> CPs ++ characters_to_nfc_list(Str);
- [CP|Str] -> [CP|characters_to_nfc_list(Str)];
- [] -> []
+ [GC|Str] when is_list(GC) -> characters_to_nfc_list(Str, lists:reverse(GC, Acc));
+ [CP|Str] -> characters_to_nfc_list(Str, [CP | Acc]);
+ [] -> lists:reverse(Acc);
+ {error,Error} -> {error, lists:reverse(Acc), Error}
end.
--spec characters_to_nfc_binary(chardata()) -> unicode_binary().
+-spec characters_to_nfc_binary(chardata()) -> unicode_binary() | {error, unicode_binary(), chardata()}.
characters_to_nfc_binary(CD) ->
- list_to_binary(characters_to_nfc_binary(CD, ?GC_N, [])).
+ characters_to_nfc_binary(CD, ?GC_N, [], []).
-characters_to_nfc_binary(CD, N, Row) when N > 0 ->
+characters_to_nfc_binary(CD, N, Row, Acc) when N > 0 ->
case unicode_util:nfc(CD) of
- [GC|Str] -> characters_to_nfc_binary(Str, N-1, [GC|Row]);
- [] -> [characters_to_binary(lists:reverse(Row))]
+ [GC|Str] -> characters_to_nfc_binary(Str, N-1, [GC|Row], Acc);
+ [] -> acc_to_binary(prepend_row_to_acc(Row, Acc));
+ {error, Error} -> {error, acc_to_binary(prepend_row_to_acc(Row, Acc)), Error}
end;
-characters_to_nfc_binary(CD, _, Row) ->
- [characters_to_binary(lists:reverse(Row))|characters_to_nfc_binary(CD,?GC_N,[])].
+characters_to_nfc_binary(CD, _, Row, Acc) ->
+ characters_to_nfc_binary(CD, ?GC_N, [], prepend_row_to_acc(Row, Acc)).
%% Compability Canonical compose string to list of chars
--spec characters_to_nfkc_list(chardata()) -> [char()].
+-spec characters_to_nfkc_list(chardata()) -> [char()] | {error, [char()], chardata()}.
characters_to_nfkc_list(CD) ->
+ characters_to_nfkc_list(CD, []).
+characters_to_nfkc_list(CD, Acc) ->
case unicode_util:nfkc(CD) of
- [CPs|Str] when is_list(CPs) -> CPs ++ characters_to_nfkc_list(Str);
- [CP|Str] -> [CP|characters_to_nfkc_list(Str)];
- [] -> []
+ [GC|Str] when is_list(GC) -> characters_to_nfkc_list(Str, lists:reverse(GC, Acc));
+ [CP|Str] -> characters_to_nfkc_list(Str, [CP | Acc]);
+ [] -> lists:reverse(Acc);
+ {error,Error} -> {error, lists:reverse(Acc), Error}
end.
--spec characters_to_nfkc_binary(chardata()) -> unicode_binary().
+-spec characters_to_nfkc_binary(chardata()) -> unicode_binary() | {error, unicode_binary(), chardata()}.
characters_to_nfkc_binary(CD) ->
- list_to_binary(characters_to_nfkc_binary(CD, ?GC_N, [])).
+ characters_to_nfkc_binary(CD, ?GC_N, [], []).
-characters_to_nfkc_binary(CD, N, Row) when N > 0 ->
+characters_to_nfkc_binary(CD, N, Row, Acc) when N > 0 ->
case unicode_util:nfkc(CD) of
- [GC|Str] -> characters_to_nfkc_binary(Str, N-1, [GC|Row]);
- [] -> [characters_to_binary(lists:reverse(Row))]
+ [GC|Str] -> characters_to_nfkc_binary(Str, N-1, [GC|Row], Acc);
+ [] -> acc_to_binary(prepend_row_to_acc(Row, Acc));
+ {error, Error} -> {error, acc_to_binary(prepend_row_to_acc(Row, Acc)), Error}
end;
-characters_to_nfkc_binary(CD, _, Row) ->
- [characters_to_binary(lists:reverse(Row))|characters_to_nfkc_binary(CD,?GC_N,[])].
+characters_to_nfkc_binary(CD, _, Row, Acc) ->
+ characters_to_nfkc_binary(CD, ?GC_N, [], prepend_row_to_acc(Row, Acc)).
+
+acc_to_binary(Acc) ->
+ list_to_binary(lists:reverse(Acc)).
+prepend_row_to_acc(Row, Acc) ->
+ [characters_to_binary(lists:reverse(Row))|Acc].
%% internals