Source file snippet.ml
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open! Import
open! Diagnostic
module Source_descr = Source_reader.Source_descr
let margin_length_of_string line_content =
String.length line_content - String.length (String.lstrip line_content)
;;
module Utf8 = struct
let length s =
let decoder = Uutf.decoder ~encoding:`UTF_8 (`String s) in
let rec loop acc =
match Uutf.decode decoder with
| `Uchar _ -> loop (acc + 1)
| `End -> acc
| `Malformed _ -> raise (Invalid_argument "invalid UTF-8")
| `Await -> assert false
in
loop 0
;;
end
module type Number = Index
module Int_number = struct
module T = struct
type t = int [@@deriving compare, hash, sexp]
end
include T
include Comparable.Make (T)
let invariant t = Invariant.invariant [%here] t sexp_of_t (fun () -> assert (t >= 1))
let pp = Format.pp_print_int
let to_string = Int.to_string
let of_int t =
invariant t;
t
;;
let initial = 1
let add t off =
let t = t + off in
invariant t;
t
;;
let sub t off =
let t = t - off in
invariant t;
t
;;
let diff t1 t2 = t1 - t2
end
module Line_number = struct
include Int_number
let of_line_index (idx : Line_index.t) = (idx :> int) + 1
end
module Column_number = struct
include Int_number
let of_byte_index (idx : Byte_index.t) ~sd ~line =
let content = Source_reader.(slicei sd (Line.start line) idx) in
let length = Utf8.length content in
length + 1
;;
end
module Multi_line_label = struct
module Id = Int
type t =
| Top of
{ id : Id.t
; start : Column_number.t
; priority : Priority.t
}
| Bottom of
{ id : Id.t
; stop : Column_number.t
; priority : Priority.t
; label : Message.t
}
[@@deriving sexp]
end
module Line = struct
type stag =
{ priority : Priority.t
; inline_labels : (Priority.t * Message.t) list
}
and segment =
{ content : string
; length : int
; stag : stag option
}
and t =
{ segments : segment list
; multi_line_labels : Multi_line_label.t list
; margin_length : int
}
[@@deriving sexp]
end
type block =
{ start : Line_index.t
; lines : Line.t list
}
and source =
{ source : Source.t
; locus : locus
; blocks : block list
}
and locus = Line_number.t * Column_number.t
and sources =
| Rich of source list
| Compact of (Source.t * locus) list
and 'code t =
{ severity : Severity.t
; message : Message.t
; code : 'code option
; sources : sources
; notes : Message.t list
}
[@@deriving sexp]
let locus_of_labels ~sd (labels : Label.t list) =
let _, locus_idx =
labels
|> List.map ~f:(fun label -> label.priority, Range.start label.range)
|> List.max_elt ~compare:[%compare: Diagnostic.Priority.t * Byte_index.t]
|> Option.value_exn ~here:[%here]
in
let line = Source_reader.Line.of_byte_index sd locus_idx in
Line_number.of_line_index line.idx, Column_number.of_byte_index locus_idx ~sd ~line
;;
let group_labels_by_source labels =
labels
|> List.sort_and_group
~compare:
(Comparable.lift Source.compare ~f:(fun (label : Label.t) ->
Range.source label.range))
|> List.map ~f:(fun labels ->
let source = Range.source (List.hd_exn labels).range in
source, labels)
;;
module Of_diagnostic = struct
type 'a with_line =
{ line : Line_index.t
; it : 'a
}
let range_of_labels = function
| [] -> assert false
| { Label.range; _ } :: _ as labels ->
List.fold_left
labels
~f:(fun range label -> Range.merge range label.range)
~init:range
;;
let line_of_range ~sd (line : Source_reader.Line.t) =
let content = Source_reader.Line.slice ~sd line in
{ line = line.idx
; it =
Line.
{ segments = [ { content; length = Utf8.length content; stag = None } ]
; multi_line_labels = []
; margin_length = margin_length_of_string content
}
}
;;
let line_of_idx ~sd (line_idx : Line_index.t) =
line_of_range ~sd @@ Source_reader.Line.of_line_index sd line_idx
;;
module Priority_count = struct
type t =
{ primary : int
; secondary : int
}
let zero = { primary = 0; secondary = 0 }
let start t ~priority : t =
match priority with
| Priority.Primary -> { t with primary = t.primary + 1 }
| Secondary -> { t with secondary = t.secondary + 1 }
;;
let stop t ~priority : t =
match priority with
| Priority.Primary ->
assert (t.primary > 0);
{ t with primary = t.primary - 1 }
| Secondary ->
assert (t.secondary > 0);
{ t with secondary = t.secondary - 1 }
;;
let priority = function
| { primary = 0; secondary = 0 } -> None
| { primary = 0; secondary = _ } -> Some Priority.Secondary
| { primary = _; secondary = _ } -> Some Primary
;;
end
let add_eol_segment ~sd ~(line : Source_reader.Line.t) cursor rev_segments =
let stop = Source_reader.Line.stop line in
if
Byte_index.(add cursor 1 < stop)
then
Line.
{ content = Source_reader.slicei sd cursor stop
; length = Byte_index.(diff stop cursor)
; stag = None
}
:: rev_segments
else rev_segments
;;
let end_segments ~sd ~(line : Source_reader.Line.t) cursor rev_segments =
rev_segments |> add_eol_segment ~sd ~line cursor |> List.rev
;;
let segments_of_labels ~sd ~(line : Source_reader.Line.t) (labels : Label.t list) =
let points =
let compare_point =
Comparable.lift
[%compare: Byte_index.t * [ `Start | `Stop ]]
~f:(fun (idx, _, start_or_stop) ->
let start_or_stop =
match start_or_stop with
| `Start _ -> `Start
| `Stop -> `Stop
in
idx, start_or_stop)
in
labels
|> List.concat_map ~f:(fun Label.{ range; priority; message } ->
let start, stop = Range.split range in
[ start, priority, `Start message; stop, priority, `Stop ])
|> List.sort ~compare:compare_point
in
let rev_segments, _, cursor, cursor_labels =
List.fold_left
points
~init:([], Priority_count.zero, Source_reader.Line.start line, [])
~f:
(fun
(rev_segments, priority_count, cursor, cursor_labels)
(idx, priority, start_or_stop)
->
if Byte_index.(cursor = idx)
then (
let priority_count, cursor_msgs =
match start_or_stop with
| `Start msg ->
( Priority_count.start priority_count ~priority
, (priority, msg) :: cursor_labels )
| `Stop ->
Priority_count.stop priority_count ~priority, cursor_labels
in
rev_segments, priority_count, cursor, cursor_msgs)
else (
let content = Source_reader.slicei sd cursor idx in
let segment =
Line.
{ content
; length = Utf8.length content
; stag =
Option.(
Priority_count.priority priority_count
>>| fun priority -> { priority; inline_labels = cursor_labels })
}
in
let priority_count, cursor_labels =
match start_or_stop with
| `Start msg ->
Priority_count.start priority_count ~priority, [ priority, msg ]
| `Stop -> Priority_count.stop priority_count ~priority, []
in
segment :: rev_segments, priority_count, idx, cursor_labels))
in
assert (List.is_empty cursor_labels);
let segments = end_segments ~sd ~line cursor rev_segments in
segments
;;
let line_of_labels ~sd ~line labels multi_line_labels =
let segments = segments_of_labels ~sd ~line labels in
{ line = line.idx
; it =
Line.
{ segments
; multi_line_labels
; margin_length = margin_length_of_string (Source_reader.Line.slice ~sd line)
}
}
;;
let add_contextual_lines ~sd lines =
let add_multi_line_label_contextual_lines =
List.concat_map_with_next_and_prev
~f:(fun (l2 : Line.t with_line) ~prev:l1 ~next:l3 ->
if List.is_empty l2.it.multi_line_labels
then [ l2 ]
else (
let next_line = Line_index.(add l2.line 1) in
let prefix =
match l1 with
| None when Line_index.(l2.line > initial) ->
[ line_of_idx ~sd Line_index.(sub l2.line 1) ]
| Some l1 when Line_index.(diff l2.line l1.line) > 1 ->
[ line_of_idx ~sd Line_index.(sub l2.line 1) ]
| _ -> []
in
let postfix =
match l3 with
| None when Line_index.(next_line < (Source_reader.Line.last sd).idx) ->
[ line_of_idx ~sd next_line ]
| Some l3 when Line_index.(diff l3.line l2.line) > 1 ->
[ line_of_idx ~sd next_line ]
| _ -> []
in
prefix @ [ l2 ] @ postfix))
in
let add_gap_contextual_lines =
List.concat_map_with_next ~f:(fun l1 ~next:l2 ->
match l2 with
| None -> [ l1 ]
| Some l2 ->
let line_delta = Line_index.(diff l2.line l1.line) in
if line_delta <= 0
then assert false
else if line_delta = 1
then [ l1 ]
else if line_delta = 2
then [ l1; line_of_idx ~sd Line_index.(add l1.line 1) ]
else
[ l1 ])
in
lines |> add_multi_line_label_contextual_lines |> add_gap_contextual_lines
;;
let group =
let splitting_threshold = 2 in
let block ~start ~rest = { start = start.line; lines = start.it :: rest } in
let rec loop = function
| [] -> assert false
| [ l ] -> l, [], []
| l1 :: ls ->
let l2, ls, blocks = loop ls in
if Line_index.(diff l2.line l1.line) >= splitting_threshold
then l1, [], block ~start:l2 ~rest:ls :: blocks
else l1, l2.it :: ls, blocks
in
function
| [] -> []
| ls ->
let l, ls, blocks = loop ls in
block ~start:l ~rest:ls :: blocks
;;
module Line_labels = struct
type t =
{ mutable inline_labels : Label.t list
; mutable multi_line_labels : Multi_line_label.t list
}
let create () = { inline_labels = []; multi_line_labels = [] }
let add_inline_label t inline_label =
t.inline_labels <- inline_label :: t.inline_labels
;;
let add_multi_line_label t multi_line_label =
t.multi_line_labels <- multi_line_label :: t.multi_line_labels
;;
end
let lines_of_labels ~sd labels =
let range = range_of_labels labels in
let enumerated_labels = List.mapi labels ~f:(fun i label -> i, label) in
let _, rev_lines =
Iter.fold
(Source_reader.lines_in_range sd range)
~init:(enumerated_labels, [])
~f:(fun (labels, rev_lines) (line : Source_reader.Line.t) ->
let line_start, line_stop = Source_reader.Line.split line in
let line_labels = Line_labels.create () in
let labels =
List.filter labels ~f:(fun ((id, label) : _ * Label.t) ->
let label_start, label_stop = Range.split label.range in
if Byte_index.(line_start <= label_start && label_stop <= line_stop)
then (
Line_labels.add_inline_label line_labels label;
false)
else if Byte_index.(line_start <= label_start && label_start <= line_stop)
then (
Line_labels.add_multi_line_label line_labels
@@ Multi_line_label.Top
{ id
; start = Column_number.of_byte_index label_start ~line ~sd
; priority = label.priority
};
true)
else if Byte_index.(label_start < line_start && line_stop < label_stop)
then
true
else if Byte_index.(label_start < line_start && label_stop <= line_stop)
then (
Line_labels.add_multi_line_label line_labels
@@ Multi_line_label.Bottom
{ id
; stop = Column_number.of_byte_index label_stop ~line ~sd
; priority = label.priority
; label = label.message
};
false)
else
true)
in
( labels
, line_of_labels
~sd
~line
line_labels.inline_labels
line_labels.multi_line_labels
:: rev_lines ))
in
List.rev rev_lines
;;
let block_of_labels ~sd labels =
labels |> lines_of_labels ~sd |> add_contextual_lines ~sd |> group
;;
let of_diagnostic Diagnostic.{ severity; message; code; labels; notes } =
let sources =
labels
|> group_labels_by_source
|> List.map ~f:(fun (source, labels) ->
let sd = Source_reader.open_source source in
{ source
; locus = locus_of_labels ~sd labels
; blocks = block_of_labels ~sd labels
})
in
{ severity; message; code; notes; sources = Rich sources }
;;
end
let of_diagnostic = Of_diagnostic.of_diagnostic
module Compact_of_diagnostic = struct
let of_diagnostic Diagnostic.{ severity; message; code; labels; notes } =
let sources =
labels
|> group_labels_by_source
|> List.map ~f:(fun (source, labels) ->
let sd = Source_reader.open_source source in
let locus = locus_of_labels ~sd labels in
source, locus)
in
{ severity; message; code; notes; sources = Compact sources }
;;
end
let compact_of_diagnostic = Compact_of_diagnostic.of_diagnostic