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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(** {1 Sentences in coqide buffers } *)
(** Cut a part of the buffer in sentences and tag them.
Invariant: either this slice ends the buffer, or it ends with ".".
May raise [Coq_lex.Unterminated] when the zone ends with
an unterminated sentence. *)
let split_slice_lax (buffer:GText.buffer) start stop =
List.iter (buffer#remove_tag ~start ~stop) Tags.Script.all;
let slice = buffer#get_text ~start ~stop () in
let apply_tag off tag =
(* off is now a utf8-compliant char offset, cf Coq_lex.utf8_adjust *)
let iter = start#forward_chars off in
buffer#apply_tag ~start:iter ~stop:iter#forward_char tag
in
Coq_lex.delimit_sentences apply_tag slice
(** Searching forward and backward a position fulfilling some condition *)
let rec forward_search cond (iter:GText.iter) =
if iter#is_end || cond iter then iter
else forward_search cond iter#forward_char
let rec backward_search cond (iter:GText.iter) =
if iter#is_start || cond iter then iter
else backward_search cond iter#backward_char
let is_sentence_end s =
s#has_tag Tags.Script.sentence || s#has_tag Tags.Script.comment_sentence
let is_char s c = s#char = Char.code c
(** Search backward the first character of a sentence, starting at [iter]
and going at most up to [soi] (meant to be the end of the locked zone).
Raise [StartError] when no proper sentence start has been found.
A character following a ending "." is considered as a sentence start
only if this character is a blank. In particular, when a final "."
at the end of the locked zone isn't followed by a blank, then this
non-blank character will be signaled as erroneous in [tag_on_insert] below.
*)
exception StartError
let grab_sentence_start (iter:GText.iter) soi =
let cond iter =
if iter#compare soi < 0 then raise StartError;
let prev = iter#backward_char in
is_sentence_end prev &&
(not (is_char prev '.') ||
List.exists (is_char iter) [' ';'\n';'\r';'\t'])
in
backward_search cond iter
(** Search forward the first character immediately after a sentence end *)
let rec grab_sentence_stop (start:GText.iter) =
(forward_search is_sentence_end start)#forward_char
(** Search forward the first character immediately after a "." sentence end
(and not just a "{" or "}" or comment end *)
let rec grab_ending_dot (start:GText.iter) =
let is_ending_dot s = is_sentence_end s && s#char = Char.code '.' in
(forward_search is_ending_dot start)#forward_char
(** Retag a zone that has been edited *)
let tag_on_insert buffer =
(* the start of the non-locked zone *)
let soi = buffer#get_iter_at_mark (`NAME "start_of_input") in
(* the inserted zone is between [prev_insert] and [insert] *)
let insert = buffer#get_iter_at_mark `INSERT in
let prev = buffer#get_iter_at_mark (`NAME "prev_insert") in
(* [prev] is normally always before [insert] even when deleting.
Let's check this nonetheless *)
let prev, insert =
if insert#compare prev < 0 then insert, prev else prev, insert
in
try
let start = grab_sentence_start prev soi in
(** The status of "{" "}" as sentence delimiters is too fragile.
We retag up to the next "." instead. *)
let stop = grab_ending_dot insert in
try split_slice_lax buffer start stop
with Coq_lex.Unterminated ->
(* This shouldn't happen frequently. Either:
- we are at eof, with indeed an unfinished sentence.
- we have just inserted an opening of comment or string.
- the inserted text ends with a "." that interacts with the "."
found by [grab_ending_dot] to form a non-ending "..".
In any case, we retag up to eof, since this isn't that costly. *)
if not stop#is_end then
try split_slice_lax buffer start buffer#end_iter
with Coq_lex.Unterminated -> ()
with StartError ->
buffer#apply_tag ~start:soi ~stop:soi#forward_char Tags.Script.error
let tag_all buffer =
let soi = buffer#get_iter_at_mark (`NAME "start_of_input") in
try split_slice_lax buffer soi buffer#end_iter
with Coq_lex.Unterminated -> ()
(** Search a sentence around some position *)
let find buffer (start:GText.iter) =
let soi = buffer#get_iter_at_mark (`NAME "start_of_input") in
try
let start = grab_sentence_start start soi in
let stop = grab_sentence_stop start in
(* Is this phrase non-empty and complete ? *)
if stop#compare start > 0 && is_sentence_end stop#backward_char
then Some (start,stop)
else None
with StartError -> None
|
