From 4cd825923f6045500841715413b46efc2ca26d82 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@dev-extend.eu>
Date: Wed, 26 Oct 2011 20:54:21 +0200
Subject: Add 'Accept-Charset' to cowboy_http_req:parse_header/2

---
 src/cowboy_http.erl     | 50 ++++++++++++++++++++++++++++++++++++++++++++++++-
 src/cowboy_http_req.erl |  6 ++++++
 2 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/src/cowboy_http.erl b/src/cowboy_http.erl
index 28346f1..9b8a178 100644
--- a/src/cowboy_http.erl
+++ b/src/cowboy_http.erl
@@ -17,7 +17,8 @@
 
 %% Parsing.
 -export([list/2, nonempty_list/2,
-	media_range/2, token/2, token_ci/2, quoted_string/2]).
+	media_range/2, charset/2,
+	token/2, token_ci/2, quoted_string/2]).
 
 %% Interpretation.
 -export([connection_to_atom/1]).
@@ -195,6 +196,42 @@ accept_ext_value(Data, Fun, Type, SubType, Params, Quality, Acc, Attr) ->
 					Type, SubType, Params, Quality, [{Attr, Value}|Acc])
 		end).
 
+%% @doc Parse a charset, followed by an optional quality value.
+-spec charset(binary(), fun()) -> any().
+charset(Data, Fun) ->
+	token_ci(Data,
+		fun (_Rest, <<>>) -> {error, badarg};
+			(Rest, Charset) ->
+				whitespace(Rest,
+					fun (<< $;, Rest2/bits >>) ->
+						whitespace(Rest2,
+							fun (Rest3) ->
+								qparam(Rest3,
+									fun (Rest4, Quality) ->
+										Fun(Rest4, {Charset, Quality})
+									end)
+							end);
+						(Rest2) ->
+							Fun(Rest2, {Charset, 1000})
+					end)
+		end).
+
+%% Parse a quality parameter string (for example q=0.500).
+-spec qparam(binary(), fun()) -> any().
+qparam(<< $q, Rest/bits >>, Fun) ->
+	whitespace(Rest,
+		fun (<< $=, Rest2/bits >>) ->
+				whitespace(Rest2,
+					fun (Rest3) ->
+						qvalue(Rest3,
+							fun (Rest4, Quality) ->
+								Fun(Rest4, Quality)
+							end)
+					end);
+			(_Rest2) ->
+				{error, badarg}
+		end).
+
 %% @doc Skip whitespace.
 -spec whitespace(binary(), fun()) -> any().
 whitespace(<< C, Rest/bits >>, Fun)
@@ -293,6 +330,17 @@ connection_to_atom([_Any|Tail]) ->
 
 -ifdef(TEST).
 
+nonempty_charset_list_test_() ->
+	%% {Value, Result}
+	Tests = [
+		{<<>>, {error, badarg}},
+		{<<"iso-8859-5, unicode-1-1;q=0.8">>, [
+			{<<"iso-8859-5">>, 1000},
+			{<<"unicode-1-1">>, 800}
+		]}
+	],
+	[{V, fun() -> R = nonempty_list(V, fun charset/2) end} || {V, R} <- Tests].
+
 nonempty_token_list_test_() ->
 	%% {Value, Result}
 	Tests = [
diff --git a/src/cowboy_http_req.erl b/src/cowboy_http_req.erl
index 1555a02..6c4aade 100644
--- a/src/cowboy_http_req.erl
+++ b/src/cowboy_http_req.erl
@@ -201,6 +201,7 @@ parse_header(Name, Req=#http_req{p_headers=PHeaders}) ->
 %% @doc Default values for semantic header parsing.
 -spec parse_header_default(http_header()) -> any().
 parse_header_default('Accept') -> [];
+parse_header_default('Accept-Charset') -> [];
 parse_header_default('Accept-Encoding') -> [];
 parse_header_default('Connection') -> [];
 parse_header_default(_Name) -> undefined.
@@ -215,6 +216,11 @@ parse_header(Name, Req, Default) when Name =:= 'Accept' ->
 		fun (Value) ->
 			cowboy_http:list(Value, fun cowboy_http:media_range/2)
 		end);
+parse_header(Name, Req, Default) when Name =:= 'Accept-Charset' ->
+	parse_header(Name, Req, Default,
+		fun (Value) ->
+			cowboy_http:nonempty_list(Value, fun cowboy_http:charset/2)
+		end);
 parse_header(Name, Req, Default) when Name =:= 'Accept-Encoding' ->
 	parse_header(Name, Req, Default,
 		fun (Value) ->
-- 
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