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open Fmlib
open Common
module Position = Character_parser.Position
type pos = Position.t
type range = pos * pos
module Make (PP: Pretty_printer.SIG) =
struct
open PP
let
(error_type:string)
: t
=
let err = " ERROR " in
let nfill =
max 0 (80 - 3 - (String.length error_type + String.length err))
in
chain [fill 2 '-';
char ' ';
string error_type;
string err;
fill nfill '-';
cut;
cut]
let print_tabs (offset: int) (tabs: int list): t =
let tab_marker = char '^'
and offset = fill offset ' '
in
let rec print number col lst =
match lst with
| [] ->
empty, empty
| [pos] ->
let fl = fill (pos - col) ' ' in
fl <+> tab_marker,
fl <+> string (string_of_int number)
| pos1 :: pos2 :: rest ->
let fl = fill (pos1 - col) ' ' in
let markers, numbers =
print (number + 1) (pos1 + 1) (pos2 :: rest)
in
fl <+> tab_marker <+> markers,
fl <+> string (string_of_int number) <+> numbers
in
let markers, numbers = print 0 0 tabs
in
offset <+> markers <+> cut
<+>
offset <+> numbers <+> cut
let print_source
(source: string)
((pos1,pos2): range)
(error_tabs: int list)
: PP.t
=
let start_line = Position.line pos1
and end_line = Position.line pos2
and start_col = Position.column pos1
and end_col = Position.column pos2
and len = String.length source
in
let end_col =
if start_line = end_line && start_col = end_col then
end_col + 1
else
end_col
in
assert (start_line <= end_line);
assert (start_line < end_line || start_col < end_col);
let number_width =
String.length (string_of_int (end_line + 1))
in
let print_line start beyond line_no =
let line_no_str = string_of_int (line_no + 1)
in
fill (number_width - String.length line_no_str) ' '
<+> string line_no_str
<+> string "| "
<+> substring source start (beyond - start)
<+> cut
and skip_line_no =
fill (number_width + 2) ' '
in
let rec print (char_offset: int) (line_no: int): t =
if end_line < line_no then
empty
else
let pos_newline =
String.find (fun c -> c = '\n') char_offset source
in
(if line_no = start_line && start_line = end_line then
print_line char_offset pos_newline line_no
<+> skip_line_no
<+> fill start_col ' '
<+> fill (end_col - start_col) '^'
<+> cut
else if line_no = start_line && start_line < end_line then
skip_line_no
<+> fill start_col ' '
<+> char 'v'
<+> fill 20 '.'
<+> cut
<+> print_line char_offset pos_newline line_no
else if line_no = end_line && start_line <> end_line then
print_line char_offset pos_newline line_no
<+> skip_line_no
<+> fill (end_col - 1) '.'
<+> char '^'
<+> cut
else if pos_newline + 1 = len && start_line = line_no + 1 then
print_line char_offset pos_newline line_no
<+> skip_line_no
<+> fill (pos_newline - char_offset) ' '
<+> char '^'
<+> cut
else
print_line char_offset pos_newline line_no
)
<+> print (pos_newline + 1) (line_no + 1)
in
print 0 0
<+>
(
if error_tabs = [] then
empty
else
print_tabs (number_width + 2) error_tabs
)
end