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(*
    Copyright © 2011 MLstate

    This file is part of OPA.

    OPA is free software: you can redistribute it and/or modify it under the
    terms of the GNU Affero General Public License, version 3, as published by
    the Free Software Foundation.

    OPA is distributed in the hope that it will be useful, but WITHOUT ANY
    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
    more details.

    You should have received a copy of the GNU Affero General Public License
    along with OPA. If not, see <http://www.gnu.org/licenses/>.
*)
%%memoization=none

types:{{

open Requestdef

(* TODO: check the grammar with RFC: http://tools.ietf.org/html/rfc2616 *)

open RequestType

}}

+request : {parse_request} <-
        / RequestLineShort {{ Complete { request_line = __1 ; request_header = RequestHeader.empty ; request_message_body = "" ; server_info = None} }}
        / RequestLine headers {{ Complete { request_line = __1 ; request_header = __2 ; request_message_body = "" ; server_info = None} }}
        / RequestLine {{ Incomplete }}

+full_response: { ((string * int) * Requestdef.Value.value Requestdef.ResponseHeader.t) } <-
        / ResponseLine response_headers {{ (__1, __2) }}

+response : {Requestdef.Value.value Requestdef.RequestHeader.t} <-
        / ResponseLine headers {{ __2 }}
RequestLine <- Word Space+ ((!EOL !Space . )+ $_) Space+ Word EOL
        {{ { _method = method_of_string __1 ; request_uri = __3 ; http_version = __5 } }}

# We need to accept HTTP/0.9 requests.
RequestLineShort <- Word Space+ Word EOL
        {{ { _method = method_of_string __1 ; request_uri = __3 ; http_version = "HTTP/0.9" } }}

ResponseLine <- Word Space+ ([0-9]+ $_) (Space+ Word)+ EOL
        {{ __1, int_of_string(__3) }}

response_headers <- Header response_headers {{ let k, v = __1 in try ResponseHeader.add (response_header_of_string k) v __2 with (Parsing _) -> __2 }}
        / EOL {{ ResponseHeader.empty }}

headers <- Header headers {{ let k, v = __1 in try RequestHeader.add (request_header_of_string k) v __2 with (Parsing _) -> __2 }}
        / EOL {{ RequestHeader.empty }}

Header <- Word [:] Space* field_value EOL {{ __1, __4 }}

field_value <-
        #Values {{ __1 }} /
        ((!EOL . {{ __2 }})* $_) {{ `string __1 }}

# FIXME: faux... la virgule peut être dans un " " ou ( ) ??? par exemple
Values <- Value ([,] Value {{__2}})+ {{ `value (__1 :: __2) }}
Value <- ((![;,\r\n] . {{ __2 }})+ $_) ([;] Space* ((![,\r\n] . {{__2 }})+ $_) {{ __3 }})? {{ __1, __2 }}

Word <- Char+ $_
Char <- !(FullSpace $ / [:] $) . {{ __2 }}

Space <- ' ' / '\t'
FullSpace <- Space / EOL
EOL <- '\r\n' / '\n' / '\r'
# EOF <- !.
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