From 5b7eafd0f00a16d78f99a27f5c7d5a0de77dc7e6 Mon Sep 17 00:00:00 2001
From: Stephane Glondu <steph@glondu.net>
Date: Wed, 21 Jul 2010 09:46:51 +0200
Subject: Imported Upstream snapshot 8.3~beta0+13298

---
 ide/gtk_parsing.ml | 176 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 176 insertions(+)
 create mode 100644 ide/gtk_parsing.ml

(limited to 'ide/gtk_parsing.ml')

diff --git a/ide/gtk_parsing.ml b/ide/gtk_parsing.ml
new file mode 100644
index 00000000..e92a345e
--- /dev/null
+++ b/ide/gtk_parsing.ml
@@ -0,0 +1,176 @@
+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(* $Id: coqide.ml 11952 2009-03-02 15:29:08Z vgross $ *)
+
+open Ideutils
+
+
+let underscore = Glib.Utf8.to_unichar "_" (ref 0)
+let arobase = Glib.Utf8.to_unichar "@" (ref 0)
+let prime = Glib.Utf8.to_unichar "'" (ref 0)
+let bn = Glib.Utf8.to_unichar "\n" (ref 0)
+let space = Glib.Utf8.to_unichar " " (ref 0)
+let tab = Glib.Utf8.to_unichar "\t" (ref 0)
+
+
+(* TODO: avoid num and prime at the head of a word *)
+let is_word_char c =
+  Glib.Unichar.isalnum c || c = underscore || c = prime
+
+
+let starts_word (it:GText.iter) =
+  prerr_endline ("Starts word ? '"^(Glib.Utf8.from_unichar it#char)^"'");
+  (not it#copy#nocopy#backward_char ||
+     (let c = it#backward_char#char in
+	not (is_word_char c)))
+
+
+let ends_word (it:GText.iter) =
+  (not it#copy#nocopy#forward_char ||
+     let c = it#forward_char#char in
+       not (is_word_char c)
+  )
+
+
+let inside_word (it:GText.iter) =
+  let c = it#char in
+    not (starts_word it) &&
+      not (ends_word it) &&
+      is_word_char c
+
+
+let is_on_word_limit (it:GText.iter) = inside_word it || ends_word it
+
+
+let find_word_start (it:GText.iter) =
+  let rec step_to_start it =
+    prerr_endline "Find word start";
+    if not it#nocopy#backward_char then
+      (prerr_endline "find_word_start: cannot backward"; it)
+    else if is_word_char it#char
+    then step_to_start it
+    else (it#nocopy#forward_char;
+	prerr_endline ("Word start at: "^(string_of_int it#offset));it)
+  in
+    step_to_start it#copy
+
+
+let find_word_end (it:GText.iter) =
+  let rec step_to_end (it:GText.iter) =
+    prerr_endline "Find word end";
+    let c = it#char in
+    if c<>0 && is_word_char c then (
+      ignore (it#nocopy#forward_char);
+      step_to_end it
+    ) else (
+      prerr_endline ("Word end at: "^(string_of_int it#offset));
+      it)
+  in
+    step_to_end it#copy
+
+
+let get_word_around (it:GText.iter) =
+  let start = find_word_start it in
+  let stop =  find_word_end it in
+    start,stop
+
+
+let rec complete_backward w (it:GText.iter) =
+  prerr_endline "Complete backward...";
+  match it#backward_search w with
+    | None -> (prerr_endline "backward_search failed";None)
+    | Some (start,stop) ->
+	prerr_endline ("complete_backward got a match:"^(string_of_int start#offset)^(string_of_int stop#offset));
+	if starts_word start then
+	  let ne = find_word_end stop in
+	    if ne#compare stop = 0
+	    then complete_backward w start
+	    else Some (start,stop,ne)
+	else complete_backward w start
+
+
+let rec complete_forward w (it:GText.iter) =
+  prerr_endline "Complete forward...";
+  match it#forward_search w with
+    | None -> None
+    | Some (start,stop) ->
+	if starts_word start then
+	  let ne = find_word_end stop in
+	    if ne#compare stop = 0 then
+	      complete_forward w stop
+	    else Some (stop,stop,ne)
+	else complete_forward w stop
+
+
+let find_comment_end (start:GText.iter) =
+  let rec find_nested_comment (search_start:GText.iter) (search_end:GText.iter) (comment_end:GText.iter) =
+    match (search_start#forward_search ~limit:search_end "(*"),(comment_end#forward_search "*)") with
+      | None,_ -> comment_end
+      | Some _, None -> raise Not_found
+      | Some (_,next_search_start),Some (next_search_end,next_comment_end) ->
+          find_nested_comment next_search_start next_search_end next_comment_end
+  in
+    match start#forward_search "*)" with
+      | None -> raise Not_found
+      | Some (search_end,comment_end) -> find_nested_comment start search_end comment_end
+
+
+let rec find_string_end (start:GText.iter) =
+  let dblquote = int_of_char '"' in
+  let rec escaped_dblquote c =
+    (c#char = dblquote) && not (escaped_dblquote c#backward_char)
+  in
+    match start#forward_search "\"" with
+      | None -> raise Not_found
+      | Some (stop,next_start) ->
+          if escaped_dblquote stop#backward_char
+          then find_string_end next_start
+          else next_start
+
+
+let rec find_next_sentence (from:GText.iter) =
+  match (from#forward_search ".") with
+    | None -> raise Not_found
+    | Some (non_vernac_search_end,next_sentence) ->
+        match from#forward_search ~limit:non_vernac_search_end "(*",from#forward_search ~limit:non_vernac_search_end "\"" with
+          | None,None ->
+              if Glib.Unichar.isspace next_sentence#char || next_sentence#compare next_sentence#forward_char == 0
+              then next_sentence else find_next_sentence next_sentence
+          | None,Some (_,string_search_start) -> find_next_sentence (find_string_end string_search_start)
+          | Some (_,comment_search_start),None -> find_next_sentence (find_comment_end comment_search_start)
+          | Some (_,comment_search_start),Some (_,string_search_start) ->
+              find_next_sentence (
+                if comment_search_start#compare string_search_start < 0
+                then find_comment_end comment_search_start
+                else find_string_end string_search_start)
+
+
+let find_nearest_forward (cursor:GText.iter) targets =
+  let fold_targets acc target =
+    match cursor#forward_search target,acc with
+      | Some (t_start,_),Some nearest when (t_start#compare nearest < 0) -> Some t_start
+      | Some (t_start,_),None -> Some t_start
+      | _ -> acc
+  in
+    match List.fold_left fold_targets None targets with
+      | None -> raise Not_found
+      | Some nearest -> nearest
+
+
+let find_nearest_backward (cursor:GText.iter) targets =
+  let fold_targets acc target =
+    match cursor#backward_search target,acc with
+      | Some (t_start,_),Some nearest when (t_start#compare nearest > 0) -> Some t_start
+      | Some (t_start,_),None -> Some t_start
+      | _ -> acc
+  in
+    match List.fold_left fold_targets None targets with
+      | None -> raise Not_found
+      | Some nearest -> nearest
+
-- 
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