WIP: Moving formatters to HZ
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278
src/hz_format.erl
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278
src/hz_format.erl
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%%% @doc
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%%% GajuDesk Helper Functions
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%%% @end
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-module(hz_format).
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-export([price/1, price/3, price/4, % read_price/1,
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price_to_string/1, string_to_price/1]).
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price(Pucks) ->
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price(gaju, {west, $,, 3},Pucks).
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price(puck, {west, Separator, Period}, Pucks) ->
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western_format(Separator, Period, Pucks);
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price(gaju, {west, Separator = $., Period}, Pucks) ->
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western_format(Separator, $,, Period, all, Pucks);
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price(gaju, {west, Separator, Period}, Pucks) ->
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western_format(Separator, $., Period, all, Pucks);
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price(Unit, jp, Pucks) ->
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jp_format(Unit, all, Pucks).
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-spec price(Unit, Style, Precision, Pucks) -> Serialized
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when Unit :: gaju | puck,
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Style :: jp | jp_pucks | {Separator, Period},
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Precision :: all | 0..18,
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Separator :: $, | $. | $_,
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Period :: 3 | 4,
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Pucks :: integer(),
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Serialized :: string().
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%% @doc
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%% A formatting function that accepts a price value in pucks as an integer, and outputs a string
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%% formatted in the desired way.
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%%
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%% Consider, for example, a few input and output pairs:
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%% ```
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%% price({$,, 3}, 3, 123456789123456789123456789) ->
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%% "木123,456,789.123".
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%%
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%% price({$,, 3}, 6, 123456789123456789123456789) ->
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%% "木123,456,789.123,456"
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%%
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%% price({$,, 3}, all, 123456789123456789123456789) ->
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%% "木123.456.789,123.456.789.123.456.789"
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%%
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%% price({$_, 4}, 10, 123456789123456789123456789) ->
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%% "木1_2345_6789.1234_5678_91"
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%%
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%% price(jp, 3, 123456789123456789123456789) ->
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%% "1億2345万6789木12京3000兆本"
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%%
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%% price(jp, 6, 123456789123456789123456789) ->
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%% "1億2345万6789木12京3456兆本"
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%%
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%% price(jp, 0, 123456789123456789123456789) ->
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%% "1億2345万6789木"
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%%
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%% price(jp_pucks, all, 123456789123456789123456789) ->
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%% "123秭4567垓8912京3456兆7891億2345万6789本"
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%% '''
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price(puck, {west, Separator, Period}, _, Pucks) ->
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western_format(Separator, Period, Pucks);
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price(gaju, {west, Separator = $., Period}, Precision, Pucks) ->
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western_format(Separator, $,, Period, Precision, Pucks);
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price(gaju, {west, Separator, Period}, Precision, Pucks) ->
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western_format(Separator, $., Period, Precision, Pucks);
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price(Unit, jp, Precision, Pucks) ->
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jp_format(Unit, Precision, Pucks).
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western_format(Separator, Period, Pucks) ->
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P = lists:reverse(integer_to_list(Pucks)),
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[puck_mark() | separate(Separator, Period, P)].
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western_format(Separator, _, Period, 0, Pucks) ->
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G = lists:reverse(integer_to_list(Pucks div one_gaju())),
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[gaju_mark() | separate(Separator, Period, G)];
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western_format(Separator, Break, Period, Precision, Pucks) ->
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SP = integer_to_list(Pucks),
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Length = length(SP),
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Over18 = Length > 18,
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NoPucks = (Pucks rem one_gaju()) =:= 0,
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case {Over18, NoPucks} of
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{true, true} ->
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Gs = lists:reverse(lists:sublist(Length - 18, SP)),
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[gaju_mark() | separate(Separator, Period, Gs)];
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{true, false} ->
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{GChars, PChars} = lists:split(18, SP),
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H = [gaju_mark() | separate(Separator, Period, lists:reverse(GChars))],
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{P, E} = decimal_pucks(Precision, PChars),
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T = lists:reverse(separate(Separator, Period, P)),
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lists:flatten([H, Break, T, E]);
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{false, true} ->
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[gaju_mark(), $0];
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{false, false} ->
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{P, E} = decimal_pucks(Precision, PChars),
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T = lists:reverse(separate(Separator, Period, P)),
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lists:flatten([gaju_mark(), $0, Break, T, E])
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end.
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decimal_pucks(all, PChars) ->
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RTrailing = lists:reverse(PChars),
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{lists:reverse(lists:dropwhile(fun(C) -> C =:= $0 end, RTrailing)), ""};
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decimal_pucks(Precision, PChars) ->
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{Significant, Rest} = lists:split(min(Precision, 18), PChars),
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RTrailing = lists:reverse(Significant),
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Trailing = lists:reverse(lists:dropwhile(fun(C) -> C =:= $0 end, RTrailing)),
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case lists:all(fun(C) -> C =:= $0 end, Rest) of
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true -> {Trailing, ""};
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false -> {Trailing, "..."}
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end.
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separate(_, _, "") ->
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"";
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separate(S, P, G) ->
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separate(S, P, 1, G, []).
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separate(_, _, _, [H], A) ->
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[H | A];
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separate(S, P, P, [H | T], A) ->
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separate(S, P, 1, T, [S, H | A]);
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separate(S, P, N, [H | T], A) ->
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separate(S, P, N + 1, T, [H | A]).
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jp_format(gaju, 0, Pucks) ->
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G = lists:reverse(integer_to_list(Pucks div one_gaju())),
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rank(gaju_mark(), G);
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jp_format(gaju, all, Pucks) ->
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H = jp_format(gaju, 0, Pucks),
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T = jp_format(puck, all, Pucks rem one_gaju()),
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H ++ T;
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jp_format(gaju, Precision, Pucks) ->
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H = jp_format(gaju, 0, Pucks),
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T = jp_format(puck, Precision, Pucks rem one_gaju()),
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H ++ T;
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jp_format(puck, all, Pucks) ->
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P = lists:reverse(integer_to_list(Pucks)),
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case lists:all(fun(C) -> C =:= $0 end, P) of
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false -> rank(puck_mark(), P);
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true -> [$0, puck_mark()]
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end;
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jp_format(puck, Precision, Pucks) ->
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Digits = min(Precision, 18),
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P = lists:reverse(integer_to_list(Pucks)),
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case length(P) > Digits of
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true ->
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[$0, puck_mark()];
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false ->
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Significant = lists:nthtail(Digits, P),
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Filler = tuple_to_list(erlang:make_tuple(Digits, $0)),
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PuckingString = Filler ++ Significant,
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case lists:all(fun(C) -> C =:= $0 end, PuckingString) of
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false -> rank(puck_mark(), PuckingString);
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true -> [$0, puck_mark()]
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end
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end.
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rank(Symbol, [$0, $0, $0, $0 | PT]) ->
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rank(jp_ranks(), PT, [Symbol]);
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rank(Symbol, [P4, $0, $0, $0 | PT]) ->
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rank(jp_ranks(), PT, [P4, Symbol]);
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rank(Symbol, [P4, P3, $0, $0 | PT]) ->
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rank(jp_ranks(), PT, [P3, P4, Symbol]);
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rank(Symbol, [P4, P3, P2, $0 | PT]) ->
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rank(jp_ranks(), PT, [P2, P3, P4, Symbol]);
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rank(Symbol, [P4, P3, P2, P1 | PT]) ->
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rank(jp_ranks(), PT, [P1, P2, P3, P4, Symbol]);
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rank(Symbol, [P4]) ->
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[P4, Symbol];
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rank(Symbol, [P4, P3]) ->
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[P3, P4, Symbol];
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rank(Symbol, [P4, P3, P2]) ->
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[P2, P3, P4, Symbol].
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jp_ranks() ->
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"万億兆京垓秭穣溝澗正載極".
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rank([_ | RT], [$0, $0, $0, $0 | PT], A) ->
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rank(RT, PT, A);
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rank([RH | RT], [P4, $0, $0, $0 | PT], A) ->
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rank(RT, PT, [P4, RH | A]);
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rank([RH | RT], [P4, P3, $0, $0 | PT], A) ->
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rank(RT, PT, [P3, P4, RH | A]);
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rank([RH | RT], [P4, P3, P2, $0 | PT], A) ->
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rank(RT, PT, [P2, P3, P4, RH | A]);
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rank([RH | RT], [P4, P3, P2, P1 | PT], A) ->
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rank(RT, PT, [P1, P2, P3, P4, RH | A]);
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rank(_, [$0, $0, $0, $0], A) ->
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A;
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rank(_, [$0, $0, $0], A) ->
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A;
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rank(_, [$0, $0], A) ->
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A;
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rank(_, [$0], A) ->
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A;
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rank(_, [], A) ->
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A;
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rank([RH | _], [P4, $0, $0, $0], A) ->
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[P4, RH | A];
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rank([RH | _], [P4, $0, $0], A) ->
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[P4, RH | A];
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rank([RH | _], [P4, $0], A) ->
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[P4, RH | A];
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rank([RH | _], [P4], A) ->
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[P4, RH | A];
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rank([RH | _], [P4, P3, $0, $0], A) ->
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[P3, P4, RH | A];
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rank([RH | _], [P4, P3, $0], A) ->
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[P3, P4, RH | A];
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rank([RH | _], [P4, P3], A) ->
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[P3, P4, RH | A];
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rank([RH | _], [P4, P3, P2, $0], A) ->
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[P2, P3, P4, RH | A];
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rank([RH | _], [P4, P3, P2], A) ->
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[P2, P3, P4, RH | A];
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rank([RH | _], [P4, P3, P2, P1], A) ->
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[P1, P2, P3, P4, RH | A].
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gaju_mark() -> $木.
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puck_mark() -> $本.
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one_gaju() -> 1_000_000_000_000_000_000.
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-spec price_to_string(Pucks) -> Gajus
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when Pucks :: integer(),
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Gajus :: string().
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%% @doc
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%% A simplified formatting function that converts an integer value in Pucks to a string representation
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%% in Gajus. Useful for formatting generic output for UI elements
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price_to_string(Pucks) ->
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Gaju = 1_000_000_000_000_000_000,
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H = integer_to_list(Pucks div Gaju),
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R = Pucks rem Gaju,
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case string:strip(lists:flatten(io_lib:format("~18..0w", [R])), right, $0) of
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[] -> H;
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T -> string:join([H, T], ".")
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end.
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-spec string_to_price(Gajus) -> Pucks
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when Gajus :: string(),
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Pucks :: integer().
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%% @doc
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%% A simplified formatting function that converts a Gaju value represented as a string to an
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%% integer value in Pucks.
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string_to_price(String) ->
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case string:split(String, ".") of
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[H] -> join_price(H, "0");
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[H, T] -> join_price(H, T);
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_ -> {error, bad_price}
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end.
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join_price(H, T) ->
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try
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Parts = [H, string:pad(T, 18, trailing, $0)],
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Price = list_to_integer(unicode:characters_to_list(Parts)),
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case Price < 0 of
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false -> {ok, Price};
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true -> {error, negative_price}
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end
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catch
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error:R -> {error, R}
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end.
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