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authorDan Gudmundsson <[email protected]>2017-06-02 14:25:02 +0200
committerDan Gudmundsson <[email protected]>2017-08-16 10:03:28 +0200
commit5f56b49c752a16ee28244981ca9b197ffd5fa691 (patch)
tree17a9563e03ecb40ba4cfe96cea2b89209ed1875b /lib/stdlib/src/edlin.erl
parentb182febe36aa63eb8290f24ba4b7932673a9a9bc (diff)
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stdlib: Improve edlin handling of unicode chars
Let edlin handle grapheme clusters instead of codepoints to improve the handling multi-codepoints characters. The ttsl driver (and protocol) still expects all lengths as codepoints. Previously it was expected that each codepoint used (at least) one terminal column for each codepoint, and a hack was made for wide characters (multicolumn) by patching in TAGGED characters to occupy the extra space so that codepoint index was equal column index. This didn't work at all for combining codepoints that do not occupy any more space than the previous character. Improved this handling by calculating column positions in move_cursor. This is based on wcwidth() and is not perfect, wcwidth() is wrong for some codepoints and wcwidth() can not know with Hangul graphemes for example. But it works better than before without making a major change in the protocol.
Diffstat (limited to 'lib/stdlib/src/edlin.erl')
-rw-r--r--lib/stdlib/src/edlin.erl132
1 files changed, 80 insertions, 52 deletions
diff --git a/lib/stdlib/src/edlin.erl b/lib/stdlib/src/edlin.erl
index 71e8471c45..64d5a71f3c 100644
--- a/lib/stdlib/src/edlin.erl
+++ b/lib/stdlib/src/edlin.erl
@@ -83,7 +83,7 @@ edit_line(Cs, {line,P,L,M}) ->
edit_line1(Cs, {line,P,L,{blink,N}}) ->
edit(Cs, P, L, none, [{move_rel,N}]);
edit_line1(Cs, {line,P,{[],[]},none}) ->
- {more_chars, {line,P,{lists:reverse(Cs),[]},none},[{put_chars, unicode, Cs}]};
+ {more_chars, {line,P,{string:reverse(Cs),[]},none},[{put_chars, unicode, Cs}]};
edit_line1(Cs, {line,P,L,M}) ->
edit(Cs, P, L, M, []).
@@ -93,14 +93,14 @@ edit([C|Cs], P, {Bef,Aft}, Prefix, Rs0) ->
case key_map(C, Prefix) of
meta ->
edit(Cs, P, {Bef,Aft}, meta, Rs0);
- meta_o ->
- edit(Cs, P, {Bef,Aft}, meta_o, Rs0);
- meta_csi ->
- edit(Cs, P, {Bef,Aft}, meta_csi, Rs0);
- meta_meta ->
- edit(Cs, P, {Bef,Aft}, meta_meta, Rs0);
- {csi, _} = Csi ->
- edit(Cs, P, {Bef,Aft}, Csi, Rs0);
+ meta_o ->
+ edit(Cs, P, {Bef,Aft}, meta_o, Rs0);
+ meta_csi ->
+ edit(Cs, P, {Bef,Aft}, meta_csi, Rs0);
+ meta_meta ->
+ edit(Cs, P, {Bef,Aft}, meta_meta, Rs0);
+ {csi, _} = Csi ->
+ edit(Cs, P, {Bef,Aft}, Csi, Rs0);
meta_left_sq_bracket ->
edit(Cs, P, {Bef,Aft}, meta_left_sq_bracket, Rs0);
search_meta ->
@@ -110,8 +110,8 @@ edit([C|Cs], P, {Bef,Aft}, Prefix, Rs0) ->
ctlx ->
edit(Cs, P, {Bef,Aft}, ctlx, Rs0);
new_line ->
- {done, reverse(Bef, Aft ++ "\n"), Cs,
- reverse(Rs0, [{move_rel,length(Aft)},{put_chars,unicode,"\n"}])};
+ {done, get_line(Bef, Aft ++ "\n"), Cs,
+ reverse(Rs0, [{move_rel,cp_len(Aft)},{put_chars,unicode,"\n"}])};
redraw_line ->
Rs1 = erase(P, Bef, Aft, Rs0),
Rs = redraw(P, Bef, Aft, Rs1),
@@ -157,7 +157,7 @@ edit([], P, L, {blink,N}, Rs) ->
edit([], P, L, Prefix, Rs) ->
{more_chars,{line,P,L,Prefix},reverse(Rs)};
edit(eof, _, {Bef,Aft}, _, Rs) ->
- {done,reverse(Bef, Aft),[],reverse(Rs, [{move_rel,length(Aft)}])}.
+ {done,get_line(Bef, Aft),[],reverse(Rs, [{move_rel,cp_len(Aft)}])}.
%% %% Assumes that arg is a string
%% %% Horizontal whitespace only.
@@ -279,11 +279,21 @@ key_map(C, search) -> {insert_search,C};
key_map(C, _) -> {undefined,C}.
%% do_op(Action, Before, After, Requests)
-
-do_op({insert,C}, Bef, [], Rs) ->
- {{[C|Bef],[]},[{put_chars, unicode,[C]}|Rs]};
-do_op({insert,C}, Bef, Aft, Rs) ->
- {{[C|Bef],Aft},[{insert_chars, unicode, [C]}|Rs]};
+%% Before and After are of lists of type string:grapheme_cluster()
+do_op({insert,C}, [], [], Rs) ->
+ {{[C],[]},[{put_chars, unicode,[C]}|Rs]};
+do_op({insert,C}, [Bef|Bef0], [], Rs) ->
+ case string:to_graphemes([Bef,C]) of
+ [GC] -> {{[GC|Bef0],[]},[{put_chars, unicode,[C]}|Rs]};
+ _ -> {{[C,Bef|Bef0],[]},[{put_chars, unicode,[C]}|Rs]}
+ end;
+do_op({insert,C}, [], Aft, Rs) ->
+ {{[C],Aft},[{insert_chars, unicode,[C]}|Rs]};
+do_op({insert,C}, [Bef|Bef0], Aft, Rs) ->
+ case string:to_graphemes([Bef,C]) of
+ [GC] -> {{[GC|Bef0],Aft},[{insert_chars, unicode,[C]}|Rs]};
+ _ -> {{[C,Bef|Bef0],Aft},[{insert_chars, unicode,[C]}|Rs]}
+ end;
%% Search mode prompt always looks like (search)`$TERMS': $RESULT.
%% the {insert_search, _} handlings allow to share this implementation
%% correctly with group.erl. This module provides $TERMS, and group.erl
@@ -299,13 +309,13 @@ do_op({insert_search, C}, Bef, [], Rs) ->
[{insert_chars, unicode, [C]++Aft}, {delete_chars,-3} | Rs],
search};
do_op({insert_search, C}, Bef, Aft, Rs) ->
- Offset= length(Aft),
+ Offset= cp_len(Aft),
NAft = "': ",
{{[C|Bef],NAft},
[{insert_chars, unicode, [C]++NAft}, {delete_chars,-Offset} | Rs],
search};
do_op({search, backward_delete_char}, [_|Bef], Aft, Rs) ->
- Offset= length(Aft)+1,
+ Offset= cp_len(Aft)+1,
NAft = "': ",
{{Bef,NAft},
[{insert_chars, unicode, NAft}, {delete_chars,-Offset}|Rs],
@@ -314,13 +324,13 @@ do_op({search, backward_delete_char}, [], _Aft, Rs) ->
Aft="': ",
{{[],Aft}, Rs, search};
do_op({search, skip_up}, Bef, Aft, Rs) ->
- Offset= length(Aft),
+ Offset= cp_len(Aft),
NAft = "': ",
{{[$\^R|Bef],NAft}, % we insert ^R as a flag to whoever called us
[{insert_chars, unicode, NAft}, {delete_chars,-Offset}|Rs],
search};
do_op({search, skip_down}, Bef, Aft, Rs) ->
- Offset= length(Aft),
+ Offset= cp_len(Aft),
NAft = "': ",
{{[$\^S|Bef],NAft}, % we insert ^S as a flag to whoever called us
[{insert_chars, unicode, NAft}, {delete_chars,-Offset}|Rs],
@@ -328,12 +338,12 @@ do_op({search, skip_down}, Bef, Aft, Rs) ->
do_op({search, search_found}, _Bef, Aft, Rs) ->
"': "++NAft = Aft,
{{[],NAft},
- [{put_chars, unicode, "\n"}, {move_rel,-length(Aft)} | Rs],
+ [{put_chars, unicode, "\n"}, {move_rel,-cp_len(Aft)} | Rs],
search_found};
do_op({search, search_quit}, _Bef, Aft, Rs) ->
"': "++NAft = Aft,
{{[],NAft},
- [{put_chars, unicode, "\n"}, {move_rel,-length(Aft)} | Rs],
+ [{put_chars, unicode, "\n"}, {move_rel,-cp_len(Aft)} | Rs],
search_quit};
%% do blink after $$
do_op({blink,C,M}, Bef=[$$,$$|_], Aft, Rs) ->
@@ -361,14 +371,16 @@ do_op(auto_blink, Bef, Aft, Rs) ->
N -> {blink,N+1,{Bef,Aft},
[{move_rel,-(N+1)}|Rs]}
end;
-do_op(forward_delete_char, Bef, [_|Aft], Rs) ->
- {{Bef,Aft},[{delete_chars,1}|Rs]};
-do_op(backward_delete_char, [_|Bef], Aft, Rs) ->
- {{Bef,Aft},[{delete_chars,-1}|Rs]};
+do_op(forward_delete_char, Bef, [GC|Aft], Rs) ->
+ {{Bef,Aft},[{delete_chars,gc_len(GC)}|Rs]};
+do_op(backward_delete_char, [GC|Bef], Aft, Rs) ->
+ {{Bef,Aft},[{delete_chars,-gc_len(GC)}|Rs]};
do_op(transpose_char, [C1,C2|Bef], [], Rs) ->
- {{[C2,C1|Bef],[]},[{put_chars, unicode,[C1,C2]},{move_rel,-2}|Rs]};
+ Len = gc_len(C1)+gc_len(C2),
+ {{[C2,C1|Bef],[]},[{put_chars, unicode,[C1,C2]},{move_rel,-Len}|Rs]};
do_op(transpose_char, [C2|Bef], [C1|Aft], Rs) ->
- {{[C2,C1|Bef],Aft},[{put_chars, unicode,[C1,C2]},{move_rel,-1}|Rs]};
+ Len = gc_len(C2),
+ {{[C2,C1|Bef],Aft},[{put_chars, unicode,[C1,C2]},{move_rel,-Len}|Rs]};
do_op(kill_word, Bef, Aft0, Rs) ->
{Aft1,Kill0,N0} = over_non_word(Aft0, [], 0),
{Aft,Kill,N} = over_word(Aft1, Kill0, N0),
@@ -381,7 +393,7 @@ do_op(backward_kill_word, Bef0, Aft, Rs) ->
{{Bef,Aft},[{delete_chars,-N}|Rs]};
do_op(kill_line, Bef, Aft, Rs) ->
put(kill_buffer, Aft),
- {{Bef,[]},[{delete_chars,length(Aft)}|Rs]};
+ {{Bef,[]},[{delete_chars,cp_len(Aft)}|Rs]};
do_op(yank, Bef, [], Rs) ->
Kill = get(kill_buffer),
{{reverse(Kill, Bef),[]},[{put_chars, unicode,Kill}|Rs]};
@@ -389,9 +401,9 @@ do_op(yank, Bef, Aft, Rs) ->
Kill = get(kill_buffer),
{{reverse(Kill, Bef),Aft},[{insert_chars, unicode,Kill}|Rs]};
do_op(forward_char, Bef, [C|Aft], Rs) ->
- {{[C|Bef],Aft},[{move_rel,1}|Rs]};
+ {{[C|Bef],Aft},[{move_rel,gc_len(C)}|Rs]};
do_op(backward_char, [C|Bef], Aft, Rs) ->
- {{Bef,[C|Aft]},[{move_rel,-1}|Rs]};
+ {{Bef,[C|Aft]},[{move_rel,-gc_len(C)}|Rs]};
do_op(forward_word, Bef0, Aft0, Rs) ->
{Aft1,Bef1,N0} = over_non_word(Aft0, Bef0, 0),
{Aft,Bef,N} = over_word(Aft1, Bef1, N0),
@@ -401,16 +413,16 @@ do_op(backward_word, Bef0, Aft0, Rs) ->
{Bef,Aft,N} = over_word(Bef1, Aft1, N0),
{{Bef,Aft},[{move_rel,-N}|Rs]};
do_op(beginning_of_line, [C|Bef], Aft, Rs) ->
- {{[],reverse(Bef, [C|Aft])},[{move_rel,-(length(Bef)+1)}|Rs]};
+ {{[],reverse(Bef, [C|Aft])},[{move_rel,-(cp_len(Bef)+1)}|Rs]};
do_op(beginning_of_line, [], Aft, Rs) ->
{{[],Aft},Rs};
do_op(end_of_line, Bef, [C|Aft], Rs) ->
- {{reverse(Aft, [C|Bef]),[]},[{move_rel,length(Aft)+1}|Rs]};
+ {{reverse(Aft, [C|Bef]),[]},[{move_rel,cp_len(Aft)+1}|Rs]};
do_op(end_of_line, Bef, [], Rs) ->
{{Bef,[]},Rs};
do_op(ctlu, Bef, Aft, Rs) ->
put(kill_buffer, reverse(Bef)),
- {{[], Aft}, [{delete_chars, -length(Bef)} | Rs]};
+ {{[], Aft}, [{delete_chars, -cp_len(Bef)} | Rs]};
do_op(beep, Bef, Aft, Rs) ->
{{Bef,Aft},[beep|Rs]};
do_op(_, Bef, Aft, Rs) ->
@@ -436,7 +448,7 @@ over_word(Cs, Stack, N) ->
until_quote([$\'|Cs], Stack, N) ->
{Cs, [$\'|Stack], N+1};
until_quote([C|Cs], Stack, N) ->
- until_quote(Cs, [C|Stack], N+1).
+ until_quote(Cs, [C|Stack], N+gc_len(C)).
over_word1([$\'=C|Cs], Stack, N) ->
until_quote(Cs, [C|Stack], N+1);
@@ -445,7 +457,7 @@ over_word1(Cs, Stack, N) ->
over_word2([C|Cs], Stack, N) ->
case word_char(C) of
- true -> over_word2(Cs, [C|Stack], N+1);
+ true -> over_word2(Cs, [C|Stack], N+gc_len(C));
false -> {[C|Cs],Stack,N}
end;
over_word2([], Stack, N) when is_integer(N) ->
@@ -454,7 +466,7 @@ over_word2([], Stack, N) when is_integer(N) ->
over_non_word([C|Cs], Stack, N) ->
case word_char(C) of
true -> {[C|Cs],Stack,N};
- false -> over_non_word(Cs, [C|Stack], N+1)
+ false -> over_non_word(Cs, [C|Stack], N+gc_len(C))
end;
over_non_word([], Stack, N) ->
{[],Stack,N}.
@@ -465,6 +477,7 @@ word_char(C) when C >= $a, C =< $z -> true;
word_char(C) when C >= $ß, C =< $ÿ, C =/= $÷ -> true;
word_char(C) when C >= $0, C =< $9 -> true;
word_char(C) when C =:= $_ -> true;
+word_char([_|_]) -> true; %% Is grapheme
word_char(_) -> false.
%% over_white(Chars, InitialStack, InitialCount) ->
@@ -488,8 +501,8 @@ over_paren(Chars, Paren, Match) ->
over_paren([C,$$,$$|Cs], Paren, Match, D, N, L) ->
over_paren([C|Cs], Paren, Match, D, N+2, L);
-over_paren([_,$$|Cs], Paren, Match, D, N, L) ->
- over_paren(Cs, Paren, Match, D, N+2, L);
+over_paren([GC,$$|Cs], Paren, Match, D, N, L) ->
+ over_paren(Cs, Paren, Match, D, N+1+gc_len(GC), L);
over_paren([Match|_], _Paren, Match, 1, N, _) ->
N;
over_paren([Match|Cs], Paren, Match, D, N, [Match|L]) ->
@@ -518,8 +531,8 @@ over_paren([$[|_], _, _, _, _, _) ->
over_paren([${|_], _, _, _, _, _) ->
beep;
-over_paren([_|Cs], Paren, Match, D, N, L) ->
- over_paren(Cs, Paren, Match, D, N+1, L);
+over_paren([GC|Cs], Paren, Match, D, N, L) ->
+ over_paren(Cs, Paren, Match, D, N+gc_len(GC), L);
over_paren([], _, _, _, _, _) ->
0.
@@ -529,8 +542,8 @@ over_paren_auto(Chars) ->
over_paren_auto([C,$$,$$|Cs], D, N, L) ->
over_paren_auto([C|Cs], D, N+2, L);
-over_paren_auto([_,$$|Cs], D, N, L) ->
- over_paren_auto(Cs, D, N+2, L);
+over_paren_auto([GC,$$|Cs], D, N, L) ->
+ over_paren_auto(Cs, D, N+1+gc_len(GC), L);
over_paren_auto([$(|_], _, N, []) ->
{N, $)};
@@ -553,8 +566,8 @@ over_paren_auto([$[|Cs], D, N, [$[|L]) ->
over_paren_auto([${|Cs], D, N, [${|L]) ->
over_paren_auto(Cs, D, N+1, L);
-over_paren_auto([_|Cs], D, N, L) ->
- over_paren_auto(Cs, D, N+1, L);
+over_paren_auto([GC|Cs], D, N, L) ->
+ over_paren_auto(Cs, D, N+gc_len(GC), L);
over_paren_auto([], _, _, _) ->
0.
@@ -574,28 +587,43 @@ erase_inp({line,_,{Bef,Aft},_}) ->
reverse(erase([], Bef, Aft, [])).
erase(Pbs, Bef, Aft, Rs) ->
- [{delete_chars,-length(Pbs)-length(Bef)},{delete_chars,length(Aft)}|Rs].
+ [{delete_chars,-cp_len(Pbs)-cp_len(Bef)},{delete_chars,cp_len(Aft)}|Rs].
redraw_line({line,Pbs,{Bef,Aft},_}) ->
reverse(redraw(Pbs, Bef, Aft, [])).
redraw(Pbs, Bef, Aft, Rs) ->
- [{move_rel,-length(Aft)},{put_chars, unicode,reverse(Bef, Aft)},{put_chars, unicode,Pbs}|Rs].
+ [{move_rel,-cp_len(Aft)},{put_chars, unicode,reverse(Bef, Aft)},{put_chars, unicode,Pbs}|Rs].
length_before({line,Pbs,{Bef,_Aft},_}) ->
- length(Pbs) + length(Bef).
+ cp_len(Pbs) + cp_len(Bef).
length_after({line,_,{_Bef,Aft},_}) ->
- length(Aft).
+ cp_len(Aft).
prompt({line,Pbs,_,_}) ->
Pbs.
current_line({line,_,{Bef, Aft},_}) ->
- reverse(Bef, Aft ++ "\n").
+ get_line(Bef, Aft ++ "\n").
current_chars({line,_,{Bef,Aft},_}) ->
- reverse(Bef, Aft).
+ get_line(Bef, Aft).
+
+get_line(Bef, Aft) ->
+ unicode:characters_to_list(reverse(Bef, Aft)).
+
+%% Grapheme length in codepoints
+gc_len(CP) when is_integer(CP) -> 1;
+gc_len(CPs) when is_list(CPs) -> length(CPs).
+
+%% String length in codepoints
+cp_len(Str) ->
+ cp_len(Str, 0).
+
+cp_len([GC|R], Len) ->
+ cp_len(R, Len + gc_len(GC));
+cp_len([], Len) -> Len.
%% %% expand(CurrentBefore) ->
%% %% {yes,Expansion} | no