Source file Fmt_odoc.ml
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open Fmt
open Odoc_parser.Ast
module Loc = Odoc_parser.Loc
type conf = {fmt_code: Fmt.code_formatter}
(** Escape characters if they are not already escaped. [escapeworthy] should
be [true] if the character should be escaped, [false] otherwise. *)
let ensure_escape ?(escape_char = '\\') ~escapeworthy s =
let dst = Buffer.create (String.length s + 8) in
let prev_off = ref 0 in
let stash until =
Buffer.add_substring dst s ~pos:!prev_off ~len:(until - !prev_off)
in
let len = String.length s in
for i = 0 to len - 1 do
if
escapeworthy s.[i]
&& not (String.Escaping.is_char_escaped s ~escape_char i)
then (
stash i ;
prev_off := i ;
Buffer.add_char dst escape_char )
done ;
stash len ;
Buffer.contents dst
let escape_brackets s =
let escapeworthy = function '[' | ']' -> true | _ -> false in
ensure_escape ~escapeworthy s
let escape_all s =
let escapeworthy = function
| '@' | '{' | '}' | '[' | ']' -> true
| _ -> false
in
ensure_escape ~escapeworthy s
let split_on_whitespaces =
String.split_on_chars ~on:['\t'; '\n'; '\011'; '\012'; '\r'; ' ']
(** Escape special characters and normalize whitespaces *)
let str_normalized ?(escape = escape_all) s =
split_on_whitespaces s
|> List.filter ~f:(Fn.non String.is_empty)
|> fun s -> list s "@ " (fun s -> escape s |> str)
let ign_loc ~f with_loc = f with_loc.Loc.value
let fmt_verbatim_block s =
let force_break = String.contains s '\n' in
let content =
if force_break then wrap "\n" "@\n" (str s)
else fits_breaks " " "\n" $ str s $ fits_breaks " " ~hint:(0, 0) ""
in
hvbox 0 (wrap "{v" "v}" content)
let fmt_metadata (lang, meta) =
let fmt_meta meta = str " " $ str meta in
str "@" $ ign_loc ~f:str lang $ opt meta (ign_loc ~f:fmt_meta)
let fmt_code_block conf s1 s2 =
let wrap_code x =
str "{" $ opt s1 fmt_metadata $ fmt "[@;<1000 2>" $ x $ fmt "@ ]}"
in
let fmt_line ~first ~last:_ l =
let l = String.rstrip l in
if first then str l
else if String.length l = 0 then str "\n"
else fmt "@," $ str l
in
let fmt_no_code s =
let lines = String.split_lines s in
let box = match lines with _ :: _ :: _ -> vbox 0 | _ -> hvbox 0 in
box (wrap_code (vbox 0 (list_fl lines fmt_line)))
in
let Odoc_parser.Loc.{location; value} = s2 in
match s1 with
| Some ({value= "ocaml"; _}, _) | None -> (
match conf.fmt_code value with
| Ok formatted -> hvbox 0 (wrap_code formatted)
| Error (`Msg message) ->
( match message with
| "" -> ()
| _ when Option.is_none s1 -> ()
| _ ->
Docstring.warn Stdlib.Format.err_formatter
{ location
; message= Format.sprintf "invalid code block: %s" message } ) ;
fmt_no_code value )
| Some _ -> fmt_no_code value
let fmt_code_span s = hovbox 0 (wrap "[" "]" (str (escape_brackets s)))
let fmt_math_span s = hovbox 2 (wrap "{m " "}" (str s))
let fmt_math_block s =
let lines =
List.drop_while ~f:String.is_empty
@@ List.rev
@@ List.drop_while ~f:String.is_empty
@@ List.rev_map ~f:String.strip
@@ String.split_lines s
in
let fmt ~first ~last:_ line =
if first then str line
else if String.is_empty line then str "\n"
else fmt "@;<1000 0>" $ str line
in
hvbox 2 (wrap "{math@;" "@;<0 -2>}" (list_fl lines fmt))
let fmt_reference = ign_loc ~f:str
let list_should_use_heavy_syntax items =
let heavy_nestable_block_elements = function
| [{Loc.value= `List _; _}] | _ :: _ :: _ -> true
| [] | [_] -> false
in
List.exists items ~f:heavy_nestable_block_elements
let block_element_should_break elem next =
match (elem, next) with
| `List (_, _, _), _ | `Paragraph _, `Paragraph _ -> true
| (`Paragraph _ | `Heading _), _ | _, (`Paragraph _ | `Heading _) -> true
| _, _ -> false
let list_block_elem elems f =
list_pn elems (fun ~prev:_ elem ~next ->
let elem = elem.Loc.value in
let break =
match next with
| Some {Loc.value= n; _}
when block_element_should_break
(elem :> block_element)
(n :> block_element) ->
fmt "\n@\n"
| Some _ -> fmt "@\n"
| None -> noop
in
f elem $ break )
let space_elt : inline_element with_location = Loc.(at (span []) (`Space ""))
let rec fmt_inline_elements elements =
let wrap_elements opn cls ~always_wrap hd = function
| [] -> wrap_if always_wrap opn cls hd
| tl -> wrap opn cls (hd $ fmt_inline_elements (space_elt :: tl))
in
let rec aux = function
| [] -> noop
| `Space _ :: `Word w :: t ->
let escape =
if String.length w > 0 && Char.(w.[0] = '+' || w.[0] = '-') then
"\\"
else ""
in
cbreak ~fits:("", 1, "") ~breaks:("", 0, escape)
$ str_normalized w $ aux t
| `Space _ :: t -> fmt "@ " $ aux t
| `Word w :: t -> str_normalized w $ aux t
| `Code_span s :: t -> fmt_code_span s $ aux t
| `Math_span s :: t -> fmt_math_span s $ aux t
| `Raw_markup (lang, s) :: t ->
let lang =
match lang with
| Some l -> str_normalized l $ str ":"
| None -> noop
in
wrap "{%%" "%%}" (lang $ str s) $ aux t
| `Styled (style, elems) :: t ->
let s =
match style with
| `Bold -> "b"
| `Italic -> "i"
| `Emphasis -> "e"
| `Superscript -> "^"
| `Subscript -> "_"
in
hovbox
(1 + String.length s + 1)
(wrap_elements "{" "}" ~always_wrap:true (str_normalized s) elems)
$ aux t
| `Reference (_kind, rf, txt) :: t ->
let rf = wrap "{!" "}" (fmt_reference rf) in
wrap_elements "{" "}" ~always_wrap:false rf txt $ aux t
| `Link (url, txt) :: t ->
let url = wrap "{:" "}" (str_normalized url) in
hovbox 2 @@ wrap_elements "{" "}" ~always_wrap:false url txt $ aux t
in
aux (List.map elements ~f:(ign_loc ~f:Fn.id))
and fmt_nestable_block_element c = function
| `Paragraph elems -> fmt_inline_elements elems
| `Code_block (s1, s2) -> fmt_code_block c s1 s2
| `Math_block s -> fmt_math_block s
| `Verbatim s -> fmt_verbatim_block s
| `Modules mods ->
hovbox 0
(wrap "{!modules:@," "@,}"
(list mods "@ " (fun ref -> fmt_reference ref)) )
| `List (k, _syntax, items) when list_should_use_heavy_syntax items ->
fmt_list_heavy c k items
| `List (k, _syntax, items) -> fmt_list_light c k items
and fmt_list_heavy c kind items =
let fmt_item elems =
let box = match elems with [_] -> hvbox 3 | _ -> vbox 3 in
box (wrap "{- " "@;<1 -3>}" (fmt_nestable_block_elements c elems))
and start : s =
match kind with `Unordered -> "{ul@," | `Ordered -> "{ol@,"
in
vbox 1 (wrap start "@;<1 -1>}" (list items "@," fmt_item))
and fmt_list_light c kind items =
let line_start =
match kind with `Unordered -> fmt "- " | `Ordered -> fmt "+ "
in
let fmt_item elems =
line_start $ hovbox 0 (fmt_nestable_block_elements c elems)
in
vbox 0 (list items "@," fmt_item)
and fmt_nestable_block_elements c elems =
list_block_elem elems (fmt_nestable_block_element c)
let at = char '@'
let space = fmt "@ "
let fmt_tag_args ?arg ?txt c tag =
at $ str tag
$ opt arg (fun x -> char ' ' $ x)
$ opt txt (function
| [] -> noop
| x -> space $ hovbox 0 (fmt_nestable_block_elements c x) )
let wrap_see = function
| `Url -> wrap "<" ">"
| `File -> wrap "'" "'"
| `Document -> wrap "\"" "\""
let fmt_tag c = function
| `Author s -> fmt_tag_args c "author" ~arg:(str s)
| `Version s -> fmt_tag_args c "version" ~arg:(str s)
| `See (k, sr, txt) -> fmt_tag_args c "see" ~arg:(wrap_see k (str sr)) ~txt
| `Since s -> fmt_tag_args c "since" ~arg:(str s)
| `Before (s, txt) -> fmt_tag_args c "before" ~arg:(str s) ~txt
| `Deprecated txt -> fmt_tag_args c "deprecated" ~txt
| `Param (s, txt) -> fmt_tag_args c "param" ~arg:(str s) ~txt
| `Raise (s, txt) -> fmt_tag_args c "raise" ~arg:(str s) ~txt
| `Return txt -> fmt_tag_args c "return" ~txt
| `Inline -> fmt_tag_args c "inline"
| `Open -> fmt_tag_args c "open"
| `Closed -> fmt_tag_args c "closed"
| `Canonical ref -> fmt_tag_args c "canonical" ~arg:(fmt_reference ref)
let fmt_block_element c = function
| `Tag tag -> hovbox 2 (fmt_tag c tag)
| `Heading (lvl, lbl, elems) ->
let lvl = Int.to_string lvl in
let lbl =
match lbl with
| Some lbl -> str ":" $ str_normalized lbl
| None -> noop
in
let elems =
if List.is_empty elems then elems else space_elt :: elems
in
hovbox 0 (wrap "{" "}" (str lvl $ lbl $ fmt_inline_elements elems))
| #nestable_block_element as elm ->
hovbox 0 (fmt_nestable_block_element c elm)
let fmt ~fmt_code (docs : t) =
vbox 0 (list_block_elem docs (fmt_block_element {fmt_code}))