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ex_cldr_numbers src decimal_formats_parser.yrl
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src/decimal_formats_parser.yrl

% Parse CLDR decimal formats which are described at
% http://unicode.org/reports/tr35/tr35-numbers.html#Number_Format_Patterns
Nonterminals decimal_format positive_format negative_format number_format
prefix suffix literal_list literal_elem currency_symbol.
Terminals plus minus format currency_1 currency_2 currency_3 currency_4 percent
permille literal semicolon pad quote quoted_char.
Rootsymbol decimal_format.
decimal_format -> positive_format semicolon negative_format : [{positive, '$1'}, {negative, '$3'}].
decimal_format -> positive_format : [{positive, '$1'}, negative('$1')].
positive_format -> prefix number_format suffix : '$1' ++ format('$2') ++ '$3'.
positive_format -> prefix number_format : '$1' ++ format('$2').
positive_format -> number_format suffix : format('$1') ++ '$2'.
positive_format -> number_format : format('$1').
positive_format -> prefix : '$1'.
negative_format -> prefix number_format suffix : '$1' ++ neg_format('$2') ++ '$3'.
negative_format -> prefix number_format : '$1' ++ neg_format('$2').
negative_format -> number_format suffix : neg_format('$1') ++ '$2'.
negative_format -> number_format : neg_format('$1').
number_format -> format : unwrap('$1').
prefix -> literal_list pad : '$1' ++ pad('$2').
prefix -> pad literal_list : pad('$1') ++ '$2'.
prefix -> literal_list : '$1'.
prefix -> pad : pad('$1').
suffix -> prefix : '$1'.
literal_list -> literal_elem literal_list : append('$1', '$2').
literal_list -> literal_elem : '$1'.
literal_elem -> currency_symbol : [{currency, unwrap('$1')}].
literal_elem -> percent : [{percent, unwrap('$1')}].
literal_elem -> permille : [{permille, unwrap('$1')}].
literal_elem -> literal : [{literal, unwrap('$1')}].
literal_elem -> plus : [{plus, "+"}].
literal_elem -> minus : [{minus, "-"}].
literal_elem -> quote : [{quote, '\''}].
literal_elem -> quoted_char : [{quoted_char, unwrap('$1')}].
currency_symbol -> currency_1 : '$1'.
currency_symbol -> currency_2 : '$1'.
currency_symbol -> currency_3 : '$1'.
currency_symbol -> currency_4 : '$1'.
Erlang code.
% If there is no negative pattern then build the default one
negative(_Positive) ->
{negative, [{minus, "-"}, {format, same_as_positive}]}.
% Append list items. Consolidate literals if possible into
% a single list element.
append([{literal, Literal1}], [{literal, Literal2} | Rest]) ->
[{literal, list_to_binary([Literal1, Literal2])}] ++ Rest;
append(A, B) when is_list(A) and is_list(B) ->
A ++ B.
format(F) ->
[{format, F}].
% Doesn't matter what the negative format is
% its always the same as the positive one
% with potentially different suffix and prefix
neg_format(_F) ->
[{format, same_as_positive}].
pad(V) ->
[{pad, unwrap(V)}].
% Return a token value
unwrap({_,_,V}) when is_list(V) -> unicode:characters_to_binary(V);
unwrap({_,_,V}) -> V.