Source file traverse_css.ml
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open! Core
open! Ppxlib
open Css_jane
type t =
{ css_string : string
; mapping : string String.Table.t
}
let map_loc (v, loc) ~f = f v, loc
let fold_c_value ~f prev_is_dot = function
| (Component_value.Delim "." as d), loc -> true, (d, loc)
| Ident s, loc when prev_is_dot -> false, (Ident (f (`Class s)), loc)
| Hash s, loc -> false, (Hash (f (`Id s)), loc)
| other -> false, other
;;
let rec map_at_rule ~f (at_rule : Css_jane.At_rule.t) : Css_jane.At_rule.t =
let prelude =
map_loc at_rule.prelude ~f:(List.folding_map ~init:false ~f:(fold_c_value ~f))
in
let block =
match at_rule.block with
| Empty -> Css_jane.Brace_block.Empty
| Declaration_list decl_list -> Declaration_list (map_decl_list decl_list ~f)
| Stylesheet stylesheet -> Stylesheet (map_stylesheet ~f stylesheet)
in
{ at_rule with prelude; block }
and map_decl_list list ~f =
let open Css_jane.Declaration_list in
let map_block = function
| Declaration d -> Declaration d
| At_rule a -> At_rule (map_at_rule ~f a)
in
map_loc list ~f:(List.map ~f:map_block)
and map_style_rule ~f (style_rule : Css_jane.Style_rule.t) =
let prelude =
style_rule.prelude |> map_loc ~f:(List.folding_map ~init:false ~f:(fold_c_value ~f))
in
let block = map_decl_list ~f style_rule.block in
{ style_rule with prelude; block }
and map_stylesheet (parsed : Css_jane.Stylesheet.t) ~f : Css_jane.Stylesheet.t =
let open Css_jane.Rule in
map_loc
parsed
~f:
(List.map ~f:(function
| Style_rule style_rule -> Style_rule (map_style_rule ~f style_rule)
| At_rule at_rule -> At_rule (map_at_rule ~f at_rule)))
;;
let transform ~pos s =
let parsed = Stylesheet.of_string ~pos s in
let hash =
let filename = Ppx_here_expander.expand_filename pos.pos_fname in
let hash_prefix = 10 in
parsed
|> Stylesheet.sexp_of_t
|> Sexp.to_string_mach
|> sprintf "%s:%s" filename
|> Md5.digest_string
|> Md5.to_hex
|> Fn.flip String.prefix hash_prefix
in
let mapping = String.Table.create () in
let sheet =
map_stylesheet parsed ~f:(function `Class identifier | `Id identifier ->
let ret = sprintf "%s_hash_%s" identifier hash in
String.Table.add mapping ~key:(sprintf "%s" identifier) ~data:ret
|> (ignore : [ `Duplicate | `Ok ] -> unit);
ret)
in
let css_string = Stylesheet.to_string_hum sheet in
let css_string =
sprintf
"\n/* %s */\n\n%s"
(Ppx_here_expander.expand_filename pos.pos_fname)
(String.strip css_string)
in
{ css_string; mapping }
;;