Source file easy_format.ml
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let rev_split l =
let rec inner xs ys = function
| (x, y) :: xys ->
inner (x::xs) (y::ys) xys
| [] -> (xs, ys)
in
inner [] [] l
type wrap = [
| `Wrap_atoms
| `Always_wrap
| `Never_wrap
| `Force_breaks
| `Force_breaks_rec
| `No_breaks
]
type label_break = [
| `Auto
| `Always
| `Always_rec
| `Never
]
type style_name = string
type style = {
tag_open : string;
tag_close : string
}
type atom_param = {
atom_style : style_name option;
}
let atom = {
atom_style = None
}
type list_param = {
space_after_opening : bool;
space_after_separator : bool;
space_before_separator : bool;
separators_stick_left : bool;
space_before_closing : bool;
stick_to_label : bool;
align_closing : bool;
wrap_body : wrap;
indent_body : int;
list_style : style_name option;
opening_style : style_name option;
body_style : style_name option;
separator_style : style_name option;
closing_style : style_name option;
}
let list = {
space_after_opening = true;
space_after_separator = true;
space_before_separator = false;
separators_stick_left = true;
space_before_closing = true;
stick_to_label = true;
align_closing = true;
wrap_body = `Wrap_atoms;
indent_body = 2;
list_style = None;
opening_style = None;
body_style = None;
separator_style = None;
closing_style = None;
}
type label_param = {
label_break: label_break;
space_after_label : bool;
indent_after_label : int;
label_style : style_name option;
}
let label = {
label_break = `Auto;
space_after_label = true;
indent_after_label = 2;
label_style = None;
}
type t =
Atom of string * atom_param
| List of (string * string * string * list_param) * t list
| Label of (t * label_param) * t
| Custom of (Format.formatter -> unit)
type escape =
[ `None
| `Escape of
((string -> int -> int -> unit) -> string -> int -> int -> unit)
| `Escape_string of (string -> string) ]
type styles = (style_name * style) list
let propagate_from_leaf_to_root
~init_acc
~merge_acc
~map_node
x =
let rec aux x =
match x with
| Atom _ ->
let acc = init_acc x in
map_node x acc
| List (param, children) ->
let new_children, accs = rev_split (List.rev_map aux children) in
let acc = List.fold_left merge_acc (init_acc x) accs in
map_node (List (param, new_children)) acc
| Label ((x1, param), x2) ->
let acc0 = init_acc x in
let new_x1, acc1 = aux x1 in
let new_x2, acc2 = aux x2 in
let acc = merge_acc (merge_acc acc0 acc1) acc2 in
map_node (Label ((new_x1, param), new_x2)) acc
| Custom _ ->
let acc = init_acc x in
map_node x acc
in
aux x
let propagate_forced_breaks x =
let init_acc = function
| List ((_, _, _, { wrap_body = `Force_breaks_rec; _ }), _)
| Label ((_, { label_break = `Always_rec; _ }), _) -> true
| Atom _
| Label _
| Custom _
| List _ -> false
in
let merge_acc force_breaks1 force_breaks2 =
force_breaks1 || force_breaks2
in
let map_node x force_breaks =
match x with
| List ((_, _, _, { wrap_body = `Force_breaks_rec; _ }), _) -> x, true
| List ((_, _, _, { wrap_body = `Force_breaks; _ }), _) -> x, force_breaks
| List ((op, sep, cl, ({ wrap_body = (`Wrap_atoms
| `Never_wrap
| `Always_wrap); _ } as p)),
children) ->
if force_breaks then
let p = { p with wrap_body = `Force_breaks } in
List ((op, sep, cl, p), children), true
else
x, false
| Label ((a, ({ label_break = `Auto; _ } as lp)), b) ->
if force_breaks then
let lp = { lp with label_break = `Always } in
Label ((a, lp), b), true
else
x, false
| List ((_, _, _, { wrap_body = `No_breaks; _ }), _)
| Label ((_, { label_break = (`Always | `Always_rec | `Never); _ }), _)
| Atom _
| Custom _ -> x, force_breaks
in
let new_x, _forced_breaks =
propagate_from_leaf_to_root
~init_acc
~merge_acc
~map_node
x
in
new_x
module Pretty =
struct
let rewrite x = propagate_forced_breaks x
let set_escape fmt escape =
let print0, flush0 = Format.pp_get_formatter_output_functions fmt () in
let tagf0 = Format.pp_get_formatter_stag_functions fmt () in
let is_tag = ref false in
let mot tag =
is_tag := true;
tagf0.mark_open_stag tag
in
let mct tag =
is_tag := true;
tagf0.mark_close_stag tag
in
let print s p n =
if !is_tag then
(print0 s p n;
is_tag := false)
else
escape print0 s p n
in
let tagf = {
tagf0 with
mark_open_stag = mot;
mark_close_stag = mct
}
in
Format.pp_set_formatter_output_functions fmt print flush0;
Format.pp_set_formatter_stag_functions fmt tagf
let set_escape_string fmt esc =
let escape print s p n =
let s0 = String.sub s p n in
let s1 = esc s0 in
print s1 0 (String.length s1)
in
set_escape fmt escape
let define_styles fmt escape l =
if l <> [] then (
Format.pp_set_tags fmt true;
let tbl1 = Hashtbl.create (2 * List.length l) in
let tbl2 = Hashtbl.create (2 * List.length l) in
List.iter (
fun (style_name, style) ->
Hashtbl.add tbl1 style_name style.tag_open;
Hashtbl.add tbl2 style_name style.tag_close
) l;
let mark_open_tag = function
| Format.String_tag style_name ->
(try Hashtbl.find tbl1 style_name
with Not_found -> "")
| _ -> ""
in
let mark_close_tag = function
| Format.String_tag style_name ->
(try Hashtbl.find tbl2 style_name
with Not_found -> "")
| _ ->
""
in
let tagf = {
(Format.pp_get_formatter_stag_functions fmt ()) with
mark_open_stag = mark_open_tag;
mark_close_stag = mark_close_tag
}
in
Format.pp_set_formatter_stag_functions fmt tagf
);
(match escape with
`None -> ()
| `Escape esc -> set_escape fmt esc
| `Escape_string esc -> set_escape_string fmt esc)
let pp_open_xbox fmt p indent =
match p.wrap_body with
`Always_wrap
| `Never_wrap
| `Wrap_atoms -> Format.pp_open_hvbox fmt indent
| `Force_breaks
| `Force_breaks_rec -> Format.pp_open_vbox fmt indent
| `No_breaks -> Format.pp_open_hbox fmt ()
let p l =
let wrap =
match p.wrap_body with
`Always_wrap -> true
| `Never_wrap
| `Force_breaks
| `Force_breaks_rec
| `No_breaks -> false
| `Wrap_atoms ->
List.for_all (function Atom _ -> true | _ -> false) l
in
if wrap then
((fun fmt -> Format.pp_open_hovbox fmt 0),
(fun fmt -> Format.pp_close_box fmt ()))
else
((fun _ -> ()),
(fun _ -> ()))
let pp_open_nonaligned_box fmt p indent l =
match p.wrap_body with
`Always_wrap -> Format.pp_open_hovbox fmt indent
| `Never_wrap -> Format.pp_open_hvbox fmt indent
| `Wrap_atoms ->
if List.for_all (function Atom _ -> true | _ -> false) l then
Format.pp_open_hovbox fmt indent
else
Format.pp_open_hvbox fmt indent
| `Force_breaks
| `Force_breaks_rec -> Format.pp_open_vbox fmt indent
| `No_breaks -> Format.pp_open_hbox fmt ()
let open_tag fmt = function
None -> ()
| Some s -> Format.pp_open_stag fmt (Format.String_tag s)
let close_tag fmt = function
None -> ()
| Some _ -> Format.pp_close_stag fmt ()
let tag_string fmt o s =
match o with
None -> Format.pp_print_string fmt s
| Some tag ->
Format.pp_open_stag fmt (Format.String_tag tag);
Format.pp_print_string fmt s;
Format.pp_close_stag fmt ()
let rec fprint_t fmt = function
Atom (s, p) ->
tag_string fmt p.atom_style s;
| List ((_, _, _, p) as param, l) ->
open_tag fmt p.list_style;
if p.align_closing then
fprint_list fmt None param l
else
fprint_list2 fmt param l;
close_tag fmt p.list_style
| Label (label, x) -> fprint_pair fmt label x
| Custom f -> f fmt
and fprint_list_body_stick_left fmt p sep hd tl =
open_tag fmt p.body_style;
fprint_t fmt hd;
List.iter (
fun x ->
if p.space_before_separator then
Format.pp_print_string fmt " ";
tag_string fmt p.separator_style sep;
if p.space_after_separator then
Format.pp_print_space fmt ()
else
Format.pp_print_cut fmt ();
fprint_t fmt x
) tl;
close_tag fmt p.body_style
and fprint_list_body_stick_right fmt p sep hd tl =
open_tag fmt p.body_style;
fprint_t fmt hd;
List.iter (
fun x ->
if p.space_before_separator then
Format.pp_print_space fmt ()
else
Format.pp_print_cut fmt ();
tag_string fmt p.separator_style sep;
if p.space_after_separator then
Format.pp_print_string fmt " ";
fprint_t fmt x
) tl;
close_tag fmt p.body_style
and fprint_opt_label fmt = function
None -> ()
| Some (lab, lp) ->
open_tag fmt lp.label_style;
fprint_t fmt lab;
close_tag fmt lp.label_style;
if lp.space_after_label then
Format.pp_print_string fmt " "
and fprint_list fmt label ((op, _sep, cl, p) as param) = function
[] ->
fprint_opt_label fmt label;
tag_string fmt p.opening_style op;
if p.space_after_opening || p.space_before_closing then
Format.pp_print_string fmt " ";
tag_string fmt p.closing_style cl
| hd :: tl as l ->
if tl = [] || p.separators_stick_left then
fprint_list_stick_left fmt label param hd tl l
else
fprint_list_stick_right fmt label param hd tl l
and fprint_list_stick_left fmt label (op, sep, cl, p) hd tl l =
let indent = p.indent_body in
pp_open_xbox fmt p indent;
fprint_opt_label fmt label;
tag_string fmt p.opening_style op;
if p.space_after_opening then
Format.pp_print_space fmt ()
else
Format.pp_print_cut fmt ();
let , = extra_box p l in
open_extra fmt;
fprint_list_body_stick_left fmt p sep hd tl;
close_extra fmt;
if p.space_before_closing then
Format.pp_print_break fmt 1 (-indent)
else
Format.pp_print_break fmt 0 (-indent);
tag_string fmt p.closing_style cl;
Format.pp_close_box fmt ()
and fprint_list_stick_right fmt label (op, sep, cl, p) hd tl l =
let base_indent = p.indent_body in
let sep_indent =
String.length sep + (if p.space_after_separator then 1 else 0)
in
let indent = base_indent + sep_indent in
pp_open_xbox fmt p indent;
fprint_opt_label fmt label;
tag_string fmt p.opening_style op;
if p.space_after_opening then
Format.pp_print_space fmt ()
else
Format.pp_print_cut fmt ();
let , = extra_box p l in
open_extra fmt;
fprint_t fmt hd;
List.iter (
fun x ->
if p.space_before_separator then
Format.pp_print_break fmt 1 (-sep_indent)
else
Format.pp_print_break fmt 0 (-sep_indent);
tag_string fmt p.separator_style sep;
if p.space_after_separator then
Format.pp_print_string fmt " ";
fprint_t fmt x
) tl;
close_extra fmt;
if p.space_before_closing then
Format.pp_print_break fmt 1 (-indent)
else
Format.pp_print_break fmt 0 (-indent);
tag_string fmt p.closing_style cl;
Format.pp_close_box fmt ()
and fprint_list2 fmt (op, sep, cl, p) = function
[] ->
tag_string fmt p.opening_style op;
if p.space_after_opening || p.space_before_closing then
Format.pp_print_string fmt " ";
tag_string fmt p.closing_style cl
| hd :: tl as l ->
tag_string fmt p.opening_style op;
if p.space_after_opening then
Format.pp_print_string fmt " ";
pp_open_nonaligned_box fmt p 0 l ;
if p.separators_stick_left then
fprint_list_body_stick_left fmt p sep hd tl
else
fprint_list_body_stick_right fmt p sep hd tl;
Format.pp_close_box fmt ();
if p.space_before_closing then
Format.pp_print_string fmt " ";
tag_string fmt p.closing_style cl
and fprint_pair fmt ((lab, lp) as label) x =
match x with
List ((op, sep, cl, p), l) when p.stick_to_label && p.align_closing ->
fprint_list fmt (Some label) (op, sep, cl, p) l
| _ ->
let indent = lp.indent_after_label in
Format.pp_open_hvbox fmt 0;
open_tag fmt lp.label_style;
fprint_t fmt lab;
close_tag fmt lp.label_style;
(match lp.label_break with
| `Auto ->
if lp.space_after_label then
Format.pp_print_break fmt 1 indent
else
Format.pp_print_break fmt 0 indent
| `Always
| `Always_rec ->
Format.pp_force_newline fmt ();
Format.pp_print_string fmt (String.make indent ' ')
| `Never ->
if lp.space_after_label then
Format.pp_print_char fmt ' '
else
()
);
fprint_t fmt x;
Format.pp_close_box fmt ()
let to_formatter fmt x =
let x = rewrite x in
fprint_t fmt x;
Format.pp_print_flush fmt ()
let to_buffer ?(escape = `None) ?(styles = []) buf x =
let fmt = Format.formatter_of_buffer buf in
define_styles fmt escape styles;
to_formatter fmt x
let to_string ?escape ?styles x =
let buf = Buffer.create 500 in
to_buffer ?escape ?styles buf x;
Buffer.contents buf
let to_channel ?(escape = `None) ?(styles = []) oc x =
let fmt = Format.formatter_of_out_channel oc in
define_styles fmt escape styles;
to_formatter fmt x
let to_stdout ?escape ?styles x = to_channel ?escape ?styles stdout x
let to_stderr ?escape ?styles x = to_channel ?escape ?styles stderr x
end
module Compact =
struct
open Printf
let rec fprint_t buf = function
Atom (s, _) -> Buffer.add_string buf s
| List (param, l) -> fprint_list buf param l
| Label (label, x) -> fprint_pair buf label x
| Custom f ->
let fmt = Format.formatter_of_buffer buf in
f fmt;
Format.pp_print_flush fmt ()
and fprint_list buf (op, sep, cl, _) = function
[] -> bprintf buf "%s%s" op cl
| x :: tl ->
Buffer.add_string buf op;
fprint_t buf x;
List.iter (
fun x ->
Buffer.add_string buf sep;
fprint_t buf x
) tl;
Buffer.add_string buf cl
and fprint_pair buf (label, _) x =
fprint_t buf label;
fprint_t buf x
let to_buffer buf x = fprint_t buf x
let to_string x =
let buf = Buffer.create 500 in
to_buffer buf x;
Buffer.contents buf
let to_formatter fmt x =
let s = to_string x in
Format.fprintf fmt "%s" s;
Format.pp_print_flush fmt ()
let to_channel oc x =
let buf = Buffer.create 500 in
to_buffer buf x;
Buffer.output_buffer oc buf
let to_stdout x = to_channel stdout x
let to_stderr x = to_channel stderr x
end
module Param =
struct
let list_true = {
space_after_opening = true;
space_after_separator = true;
space_before_separator = true;
separators_stick_left = true;
space_before_closing = true;
stick_to_label = true;
align_closing = true;
wrap_body = `Wrap_atoms;
indent_body = 2;
list_style = None;
opening_style = None;
body_style = None;
separator_style = None;
closing_style = None;
}
let list_false = {
space_after_opening = false;
space_after_separator = false;
space_before_separator = false;
separators_stick_left = false;
space_before_closing = false;
stick_to_label = false;
align_closing = false;
wrap_body = `Wrap_atoms;
indent_body = 2;
list_style = None;
opening_style = None;
body_style = None;
separator_style = None;
closing_style = None;
}
let label_true = {
label_break = `Auto;
space_after_label = true;
indent_after_label = 2;
label_style = None;
}
let label_false = {
label_break = `Auto;
space_after_label = false;
indent_after_label = 2;
label_style = None;
}
end