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(* TyXML
* http://www.ocsigen.org/tyxml
* Copyright (C) 2016 Anton Bachin
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, with linking exception;
* either version 2.1 of the License, or (at your option) any later version.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1301, USA.
*)
let parse loc (language, element_name) attributes =
let (module Reflected) =
Namespace.get language in
(* For prefix ["prefix"] and attribute names ["prefix-foo"], evaluates to
[Some "foo"], otherwise evaluates to [None].
Used to parse user-data attributes (prefixed by "data-") and ARIA
attributes (prefixed by "aria-").
*)
let parse_prefixed prefix name =
let length = String.length prefix in
let is_prefixed =
try String.sub name 0 length = prefix
with Invalid_argument _ -> false
in
if not is_prefixed then None
else Some (String.sub name length (String.length name - length))
in
(* Applied to each attribute. Accumulates individually labeled attributes,
such as img/src, in "labeled," and attributes passed in ~a in "regular." *)
let parse_attribute (labeled, regular) ((_, local_name), value) =
(* Convert the markup name of the attribute to a TyXML name without regard
to renamed attributes such as "a_input_max." Renaming will be accounted
for later. *)
let tyxml_name = Name_convention.attrib local_name in
let test_labeled (e, a, _) = e = element_name && a = local_name in
let test_blacklisted (a, _, _) = a = tyxml_name in
let test_renamed (_, a, es) = a = local_name && List.mem element_name es in
let unknown () =
Common.error loc "Unknown attribute in %s element: %s"
(Common.lang language) local_name
in
(* Check whether this attribute is individually labeled. Parse its argument
and accumulate the attribute if so. *)
match Common.find test_labeled Reflected.labeled_attributes with
| Some (_, label, parser) ->
let e =
match parser language loc local_name value with
| None ->
Common.error loc
"Internal error: labeled attribute %s without an argument" label
| Some e -> e
in
(Labelled label, e)::labeled, regular
| None ->
(* The attribute is not individually labeled, so it is passed in ~a.
First, check if the default TyXML name of this attribute collides with
the TyXML name of a renamed attribute. For example, if the language is
HTML, and this attribute has markup name "input-max" (which is
invalid), then its default TyXML name will be "a_input_max", which is a
*valid* value in TyXML. We want to avoid mapping "input-max" to
"a_input_max", because "input-max" is invalid, and because
"a_input_max" maps to "max" instead. *)
if List.exists test_blacklisted Reflected.renamed_attributes then
unknown ()
else
let parse_prefixed_attribute tag tyxml_name =
let parser =
try List.assoc tyxml_name Reflected.attribute_parsers
with Not_found ->
Common.error loc "Internal error: no parser for %s" tyxml_name
in
let identifier = Common.make ~loc language tyxml_name in
let tag = Common.string loc tag in
let e =
match parser language loc local_name value with
| Some e' -> [%expr [%e identifier] [%e tag] [%e e']] [@metaloc loc]
| None ->
Common.error loc "Internal error: no expression for %s"
tyxml_name
in
labeled, e::regular
in
(* Check if this is a "data-foo", "aria-foo", or unsafe attribute. Parse
the attribute value, and accumulate it in the list of attributes passed
in ~a. *)
match parse_prefixed "data-" local_name,
parse_prefixed "aria-" local_name,
parse_prefixed "_" local_name
with
| Some tag, _, _ -> parse_prefixed_attribute tag "a_user_data"
| _, Some tag, _ -> parse_prefixed_attribute tag "a_aria"
| _, _, Some tag ->
let identifier = Common.make ~loc language "Unsafe.string_attrib" in
let tag = Common.string loc tag in
let value = match value with
| Val s -> Common.string loc s
| Antiquot v -> v in
labeled, [%expr [%e identifier] [%e tag] [%e value]] :: regular
| None, None, None ->
let tyxml_name =
match Common.find test_renamed Reflected.renamed_attributes with
| Some (name, _, _) -> name
| None -> tyxml_name
in
let parser =
try List.assoc tyxml_name Reflected.attribute_parsers
with Not_found -> unknown ()
in
let identifier = Common.make ~loc language tyxml_name in
let e =
match parser language loc local_name value with
| None -> identifier
| Some e' -> [%expr [%e identifier] [%e e']] [@metaloc loc]
in
labeled, e::regular
in
let labeled, regular =
List.fold_left parse_attribute ([], []) attributes in
(* If there are any attributes to pass in ~a, assemble them into a parse tree
for a list, and prefix that with the ~a label. *)
if regular = [] then List.rev labeled
else
let regular =
Labelled "a",
Common.list loc (List.rev regular)
in
List.rev (regular::labeled)
|
