WIP: omg stuff

src/hz_format.erl

@@ -4,7 +4,8 @@
 
 -module(hz_format).
 
--export([price/1, price/2, price/3, price/4, % read_price/1,
+-export([price/1, price/2, price/3, price/4,
+         read/1,
          price_to_string/1, string_to_price/1]).
 
 -spec price(Pucks) -> Formatted
@@ -19,9 +20,9 @@ price(Pucks) ->
 
 
 -spec price(Style, Pucks) -> Formatted
-    when Style     :: us | ch | jp | {Separator, Period},
+    when Style     :: us | ch | jp | {Separator, Myriad},
          Separator :: $, | $. | $_,
-         Period     :: 3 | 4,
+         Myriad    :: 3 | 4,
          Pucks     :: integer(),
          Formatted :: string().
 %% @doc
@@ -34,9 +35,9 @@ price(Style, Pucks) ->
 
 -spec price(Unit, Style, Pucks) -> Formatted
     when Unit       :: gaju | puck,
-         Style     :: us | ch | jp | {Separator, Period},
+         Style      :: us | ch | jp | {Separator, Myriad},
          Separator  :: $, | $. | $_,
-         Period     :: 3 | 4,
+         Myriad     :: 3 | 4,
          Pucks      :: integer(),
          Formatted  :: string().
 %% @doc
@@ -45,30 +46,30 @@ price(Style, Pucks) ->
 %% ```
 
 price(gaju, us, Pucks) ->
-    wetsern($,, $., 3, all, Pucks);
+    western($,, $., 3, all, Pucks);
 price(puck, us, Pucks) ->
-    wetsern($,, 3, Pucks);
+    western($,, 3, Pucks);
 price(gaju, ch, Pucks) ->
-    wetsern($., $,, 3, all, Pucks);
+    western($., $,, 3, all, Pucks);
 price(puck, ch, Pucks) ->
-    wetsern($,, 3, Pucks);
+    western($,, 3, Pucks);
 price(Unit, jp, Pucks) ->
     jp(Unit, all, Pucks);
-price(gaju, {$., Period}, Pucks) ->
+price(gaju, {$., Myriad}, Pucks) ->
-    wetsern($., $,, Period, all, Pucks);
+    western($., $,, Myriad, all, Pucks);
-price(gaju, {Separator, Period}, Pucks) ->
+price(gaju, {Separator, Myriad}, Pucks) ->
-    wetsern(Separator, $., Period, all, Pucks);
+    western(Separator, $., Myriad, all, Pucks);
-price(puck, {Separator, Period}, Pucks) ->
+price(puck, {Separator, Myriad}, Pucks) ->
-    wetsern(Separator, Period, Pucks).
+    western(Separator, Myriad, Pucks).
 
 
 
 -spec price(Unit, Style, Precision, Pucks) -> Serialized
     when Unit       :: gaju | puck,
-         Style      :: us | ch | jp | {Separator, Period},
+         Style      :: us | ch | jp | {Separator, Myriad},
          Precision  :: all | 0..18,
          Separator  :: $, | $. | $_,
-         Period     :: 3 | 4,
+         Myriad     :: 3 | 4,
          Pucks      :: integer(),
          Serialized :: string().
 %% @doc
@@ -110,36 +111,47 @@ price(puck, {Separator, Period}, Pucks) ->
 %% '''
 
 price(gaju, us, Precision, Pucks) ->
-    wetsern($,, $., 3, Precision, Pucks);
+    western($,, $., 3, Precision, Pucks);
 price(gaju, ch, Precision, Pucks) ->
-    wetsern($., $,, 3, Precision, Pucks);
+    western($., $,, 3, Precision, Pucks);
 price(gaju, jp, Precision, Pucks) ->
     jp(gaju, Precision, Pucks);
-price(gaju, {$., Period}, Precision, Pucks) ->
+price(gaju, {$., Myriad}, Precision, Pucks) ->
-    wetsern($., $,, Period, Precision, Pucks);
+    western($., $,, Myriad, Precision, Pucks);
-price(gaju, {Separator, Period}, Precision, Pucks) ->
+price(gaju, {Separator, Myriad}, Precision, Pucks) ->
-    wetsern(Separator, $., Period, Precision, Pucks);
+    western(Separator, $., Myriad, Precision, Pucks);
 price(puck, us, _, Pucks) ->
-    wetsern($,, 3, Pucks);
+    western($,, 3, Pucks);
 price(puck, ch, _, Pucks) ->
-    wetsern($., 3, Pucks);
+    western($., 3, Pucks);
 price(puck, jp, _, Pucks) ->
     jp(puck, all, Pucks);
-price(puck, {Separator, Period}, _, Pucks) ->
+price(puck, {Separator, Myriad}, _, Pucks) ->
-    wetsern(Separator, Period, Pucks).
+    western(Separator, Myriad, Pucks).
 
 
 
 
-wetsern(Separator, Period, Pucks) ->
+western(Separator, Myriad, Pucks) when Pucks >= 0 ->
+    western2(Separator, Myriad, Pucks);
+western(Separator, Myriad, Pucks) when Pucks  < 0 ->
+    [$- | western2(Separator, Myriad, Pucks * -1)].
+
+western2(Separator, Myriad, Pucks) ->
     P = lists:reverse(integer_to_list(Pucks)),
-    [puck_mark() | separate(Separator, Period, P)].
+    [puck_mark() | separate(Separator, Myriad, P)].
 
 
-wetsern(Separator, _, Period, 0, Pucks) ->
+western(Separator, Break, Myriad, Precision, Pucks) when Pucks >= 0 ->
+    western2(Separator, Break, Myriad, Precision, Pucks);
+western(Separator, Break, Myriad, Precision, Pucks) when Pucks  < 0 ->
+    [$- | western2(Separator, Break, Myriad, Precision, Pucks)].
+
+
+western2(Separator, _, Myriad, 0, Pucks) ->
     G = lists:reverse(integer_to_list(Pucks div one_gaju())),
-    [gaju_mark() | separate(Separator, Period, G)];
+    [gaju_mark() | separate(Separator, Myriad, G)];
-wetsern(Separator, Break, Period, Precision, Pucks) ->
+western2(Separator, Break, Myriad, Precision, Pucks) ->
     SP = integer_to_list(Pucks),
     Length = length(SP),
     Over18 = Length > 18,
@@ -147,19 +159,19 @@ wetsern(Separator, Break, Period, Precision, Pucks) ->
     case {Over18, NoPucks} of
         {true, true} ->
             Gs = lists:reverse(lists:sublist(SP, Length - 18)),
-            [gaju_mark() | separate(Separator, Period, Gs)];
+            [gaju_mark() | separate(Separator, Myriad, Gs)];
         {true, false} ->
             {PChars, GChars} = lists:split(18, lists:reverse(SP)),
-            H = [gaju_mark() | separate(Separator, Period, GChars)],
+            H = [gaju_mark() | separate(Separator, Myriad, GChars)],
             {P, E} = decimal_pucks(Precision, lists:reverse(PChars)),
-            T = lists:reverse(separate(Separator, Period, P)),
+            T = lists:reverse(separate(Separator, Myriad, P)),
             lists:flatten([H, Break, T, E]);
         {false, true} ->
             [gaju_mark(), $0];
         {false, false} ->
             PChars = lists:flatten(string:pad(SP, 18, leading, $0)),
             {P, E} = decimal_pucks(Precision, PChars),
-            T = lists:reverse(separate(Separator, Period, P)),
+            T = lists:reverse(separate(Separator, Myriad, P)),
             lists:flatten([gaju_mark(), $0, Break, T, E])
     end.
 
@@ -189,24 +201,44 @@ separate(S, P, N, [H | T], A) ->
     separate(S, P, N + 1, T, [H | A]).
 
 
-jp(gaju, 0, Pucks) ->
+jp(Unit, Precision, Pucks) when Pucks >= 0 ->
+    jp2(Unit, Precision, Pucks);
+jp(Unit, Precision, Pucks) when Pucks  < 0 ->
+    [$－, Formatted = jp2(Unit, Precision, Pucks * -1)].
+
+jp2(gaju, 0, Pucks) ->
     G = lists:reverse(integer_to_list(Pucks div one_gaju())),
-    rank4(gaju_mark(), G);
+    myriad4(gaju_mark(), h, G);
-jp(gaju, all, Pucks) ->
+jp2(gaju, all, Pucks) ->
     H = jp(gaju, 0, Pucks),
-    T = jp(puck, all, Pucks rem one_gaju()),
+    P = lists:flatten(string:pad(integer_to_list(Pucks rem one_gaju()), 18, leading, $0),
+    T = myriad4("", l, lists:reverse(P)),
     lists:flatten([H, " ",  T]);
-jp(gaju, Precision, Pucks) ->
+jp2(gaju, Precision, Pucks) ->
     H = jp(gaju, 0, Pucks),
-    T = jp(puck, Precision, Pucks rem one_gaju()),
+    P = lists:flatten(string:pad(integer_to_list(Pucks rem one_gaju()), 18, leading, $0),
+    Digits = min(Precision, 18),
+    T =
+        case length(P) > Digits of
+            true ->
+                [];
+            false ->
+                ReverseP = lists:reverse(lists:sublist(P, Digits)),
+                PuckingString = lists:flatten(string:pad(ReverseP, 18, leading, $0)),
+                    case lists:all(fun(C) -> C =:= $0 end, PuckingString) of
+                        false -> myriad4(puck_mark(), l, PuckingString);
+                        true  -> ""
+                    end
+        end,
+    T = myriad4("", l, lists:reverse(P)),
     lists:flatten([H, " ",  T]);
-jp(puck, all, Pucks) ->
+jp2(puck, all, Pucks) ->
     P = lists:reverse(integer_to_list(Pucks)),
     case lists:all(fun(C) -> C =:= $0 end, P) of
-        false -> rank4(puck_mark(), P);
+        false -> myriad4(puck_mark(), h, P);
         true  -> [$0, puck_mark()]
     end;
-jp(puck, Precision, Pucks) ->
+jp2(puck, Precision, Pucks) ->
     Digits = min(Precision, 18),
     P = lists:flatten(string:pad(integer_to_list(Pucks), 18, leading, $0)),
     case length(P) < Digits of
@@ -215,27 +247,27 @@ jp(puck, Precision, Pucks) ->
         false ->
             PuckingString = lists:flatten(string:pad(lists:reverse(lists:sublist(P, Digits)), 18, leading, $0)),
             case lists:all(fun(C) -> C =:= $0 end, PuckingString) of
-                false -> rank4(puck_mark(), PuckingString);
+                false -> myriad4(puck_mark(), h, PuckingString);
                 true  -> [$0, puck_mark()]
             end
     end.
 
 
-rank4(Symbol, [$0, $0, $0, $0 | PT]) ->
+myriad4(Symbol, Segment, [$0, $0, $0, $0 | PT]) ->
-    rank4(ranks(jp), PT, [Symbol]);
+    rank4(ranks(Segment), PT, [Symbol]);
-rank4(Symbol, [P4, $0, $0, $0 | PT]) ->
+myriad4(Symbol, Segment, [P4, $0, $0, $0 | PT]) ->
-    rank4(ranks(jp), PT, [P4, Symbol]);
+    rank4(ranks(Segment), PT, [P4, Symbol]);
-rank4(Symbol, [P4, P3, $0, $0 | PT]) ->
+myriad4(Symbol, Segment, [P4, P3, $0, $0 | PT]) ->
-    rank4(ranks(jp), PT, [P3, P4, Symbol]);
+    rank4(ranks(Segment), PT, [P3, P4, Symbol]);
-rank4(Symbol, [P4, P3, P2, $0 | PT]) ->
+myriad4(Symbol, Segment, [P4, P3, P2, $0 | PT]) ->
-    rank4(ranks(jp), PT, [P2, P3, P4, Symbol]);
+    rank4(ranks(Segment), PT, [P2, P3, P4, Symbol]);
-rank4(Symbol, [P4, P3, P2, P1 | PT]) ->
+myriad4(Symbol, Segment, [P4, P3, P2, P1 | PT]) ->
-    rank4(ranks(jp), PT, [P1, P2, P3, P4, Symbol]);
+    rank4(ranks(Segment), PT, [P1, P2, P3, P4, Symbol]);
-rank4(Symbol, [P4]) ->
+myriad4(Symbol, _, [P4]) ->
     [P4, Symbol];
-rank4(Symbol, [P4, P3]) ->
+myriad4(Symbol, _, [P4, P3]) ->
     [P3, P4, Symbol];
-rank4(Symbol, [P4, P3, P2]) ->
+myriad4(Symbol, _, [P4, P3, P2]) ->
     [P2, P3, P4, Symbol].
 
 rank4([_  | RT], [$0, $0, $0, $0 | PT], A) ->
@@ -279,8 +311,11 @@ rank4([RH |  _], [P4, P3, P2],          A) ->
 rank4([RH |  _], [P4, P3, P2, P1],      A) ->
     [P1, P2, P3, P4, RH | A].
 
-ranks(jp) ->
+ranks(h) ->
-    "万億兆京垓秭穣溝澗正載極".
+    "万億兆京垓秭穣溝澗正載極";
+ranks(l) ->
+%   "曼戌弒俿咳".
+    "満億照鏡咳".
 
 
 gaju_mark() -> $木.
@@ -290,6 +325,159 @@ puck_mark() -> $本.
 one_gaju() -> 1_000_000_000_000_000_000.
 
 
+-spec read(Format) -> Result
+    when Format :: string(),
+         Result :: {ok, Pucks} | {error, Reason},
+         Pucks  :: integer(),
+         Reason :: {badarg, Partial :: string(), Rest :: term()}
+                 | {incomplete, Partial :: string(), Rest :: binary()}
+                 | format.
+%% @doc
+%% Convery any valid string formatted representation and output a value in pucks.
+%% This routine can fail in the special case of `ch' style formatting with a single
+%% comma and/or a single period in it, as this can trigger misinterpretation as `us'
+%% style. When in doubt, always call `read/2' with a style specified.
+
+read(Format) ->
+    case assess_style(Format) of
+        us    -> read(us, Format);
+        ch    -> read(ch, Format);
+        jp    -> read(jp, Format);
+        Error -> Error
+    end.
+
+-spec read(Style, Formatted) -> Result
+    when Style  :: us | ch | jp | undefined,
+         Format :: string(),
+         Result :: {ok, Pucks} | {error, Reason},
+         Pucks  :: integer(),
+         Reason :: {badarg, Partial :: string(), Rest :: term()}
+                 | {incomplete, Partial :: string(), Rest :: binary()}
+                 | format.
+%% @doc
+%% Convert any valid string formatted representation and output a value in pucks.
+%% Note that this function is deliberately a bit too permissive in the case of
+%% western formatting, stripping all non-halfwidth digit characters on the high
+%% and low sides of the format once the break (decimal) character is identified
+%% and sign is determined. That is to say, there are many ways to feed this wacky
+%% strings and get a number out of it, so be aware.
+
+read(Style, Format) ->
+    case unicode:characters_to_list(Format) of
+        String when is_list(String) ->
+            Trimmed = string:trim(String),
+            read2(Style, Trimmed);
+        {error, Partial, Rest} ->
+            {error, {badarg, Partial, Rest}};
+        Incomplete ->
+            {error, Incomplete}
+    end.
+
+read2(us, Format) ->
+    read_western($., Format);
+read2(ch, Format) ->
+    read_western($,, Format);
+read2(jp, Format) ->
+    read_jp(Format);
+read2(undefined, Format) ->
+    read(Format).
+
+read_western(Break, [$-, Rest]) ->
+    case read_western2(Break, Format) of
+        {ok, Pucks} -> {ok, Pucks * -1};
+        Error       -> Error
+    end;
+read_western(Break, Format) ->
+    read_western2(Break, Format).
+
+read_western2(Break, Format) ->
+    case string:split(Format, [Break], all) of
+        [[], L] -> read_western3(0, L);
+        [H, []] -> read_western3(H, 0);
+        [H,  L] -> read_western3(H, L);
+        [H]     -> read_western3(H, 0);
+        _       -> {error, format}
+    end.
+
+read_western3(0, L) ->
+    read_l(L);
+read_western3(H, 0) ->
+    case read_h(H) of
+        {ok, Gajus} -> {ok, Gajus * one_gaju()};
+        Error       -> Error
+    end;
+read_western3(H, L) ->
+    Gajus = read_h(H),
+    Pucks = read_l(L),
+    {ok, (Gajus * one_gaju()) + Pucks}.
+
+read_h(S) ->
+    case lists:filter(fun is_numchar/1, S) of
+        [] -> 0;
+        F  -> list_to_integer(Filtered)
+    end.
+
+read_l(L) ->
+    case lists:filter(fun is_numchar/1, S) of
+        [] -> 0;
+        F  -> list_to_integer(lists:flatten(string:pad(F, 18, trailing, $0)))
+    end.
+
+is_numchar(C) -> $0 =< C andalso C =< $9.
+
+read_jp([$-, Format]) ->
+    read_jp_neg(Format);
+read_jp([$－, Format]) ->
+    read_jp_neg(Format);
+read_jp(Format) ->
+    read_jp2(Format).
+
+read_jp_neg(Format) ->
+    case read_jp2(Format) of
+        {ok, Pucks} -> {ok, Pucks * -1};
+        Error       -> Error
+    end.
+
+read_jp2(Format) ->
+    case segment_jp(Format) of
+        {ok, Segments} -> assemble_jp(Segments);
+        Error          -> Error
+    end.
+
+segment_jp(Format) ->
+    case string:split(Format, [gaju_mark()], all) of
+        [Gajus, Pucks] ->
+            case read_segment(Gajus) of
+                {ok, 
+        [Gajus] ->
+            case read_segment(Gajus) of
+                {ok, GajuSegments} -> {ok, GajuSegments, ["0"]};
+                Error              -> Error
+            end;
+        [] ->
+            {ok, ["0"], ["0"]};
+        _ ->
+            {error, format}
+    end.
+
+assemble_jp({GajuSegments, PuckSegments}) ->
+    GajuString = lists:flatten(lists:map(fun expand_jp_myriad/1, GajuSegments)),
+    PuckString = lists:flatten(lists:map(fun expand_jp_myriad/1, PuckDegments)),
+    {ok, integer_to_list(lists:append(GajuString, PuckString))}.
+assemble_jp(PuckSegments) ->
+    PuckString = lists:flatten(lists:map(fun expand_jp_myriad/1, PuckDegments)),
+    {ok, integer_to_list(PuckString)}.
+
+expand_jp_myriad(String) ->
+    string:pad(String, 4, leading, $0).
+
+
+lower_jp_numchar(C) when $０ =< C andalso C =< $９ ->
+    C - $０;
+lower_jp_numchar(C) ->
+    C.
+
+
 -spec price_to_string(Pucks) -> Gajus
     when Pucks :: integer(),
          Gajus :: string().