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/src/mochifmt_records.erl

http://github.com/basho/mochiweb
Erlang | 60 lines | 23 code | 7 blank | 30 comment | 0 complexity | 6bc16b7fb95ea7246fee362f534b8748 MD5 | raw file
 1%% @author Bob Ippolito <bob@mochimedia.com>
 2%% @copyright 2008 Mochi Media, Inc.
 3%%
 4%% Permission is hereby granted, free of charge, to any person obtaining a
 5%% copy of this software and associated documentation files (the "Software"),
 6%% to deal in the Software without restriction, including without limitation
 7%% the rights to use, copy, modify, merge, publish, distribute, sublicense,
 8%% and/or sell copies of the Software, and to permit persons to whom the
 9%% Software is furnished to do so, subject to the following conditions:
10%%
11%% The above copyright notice and this permission notice shall be included in
12%% all copies or substantial portions of the Software.
13%%
14%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17%% THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19%% FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20%% DEALINGS IN THE SOFTWARE.
21
22%% @doc Formatter that understands records.
23%%
24%% Usage:
25%%
26%%    1> M = mochifmt_records:new([{rec, record_info(fields, rec)}]),
27%%    M:format("{0.bar}", [#rec{bar=foo}]).
28%%    foo
29
30-module(mochifmt_records).
31-author('bob@mochimedia.com').
32-export([new/1, get_value/3]).
33
34new([{_Rec, RecFields}]=Recs) when is_list(RecFields) ->
35    {?MODULE, Recs}.
36
37get_value(Key, Rec, {?MODULE, Recs})
38  when is_tuple(Rec) and is_atom(element(1, Rec)) ->
39    try begin
40            Atom = list_to_existing_atom(Key),
41            {_, Fields} = proplists:lookup(element(1, Rec), Recs),
42            element(get_rec_index(Atom, Fields, 2), Rec)
43        end
44    catch error:_ -> mochifmt:get_value(Key, Rec)
45    end;
46get_value(Key, Args, {?MODULE, _Recs}) ->
47    mochifmt:get_value(Key, Args).
48
49get_rec_index(Atom, [Atom | _], Index) ->
50    Index;
51get_rec_index(Atom, [_ | Rest], Index) ->
52    get_rec_index(Atom, Rest, 1 + Index).
53
54
55%%
56%% Tests
57%%
58-ifdef(TEST).
59-include_lib("eunit/include/eunit.hrl").
60-endif.