From 4f38fd688913f856c80ce24254e0f41314dabbea Mon Sep 17 00:00:00 2001
From: acondolu <andrea.condoluci@unibo.it>
Date: Sat, 15 Jul 2017 15:31:04 +0200
Subject: [PATCH] Fixes to parser

(cherry picked from commit 666a228779e465d08a0deea2e35c0cccf5722b40)
---
 ocaml/parser.ml   | 20 ++++++++++++--------
 ocaml/problems.ml | 16 ++++++++++++++++
 ocaml/problems/p  |  1 +
 3 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/ocaml/parser.ml b/ocaml/parser.ml
index e410d75..2732322 100644
--- a/ocaml/parser.ml
+++ b/ocaml/parser.ml
@@ -166,12 +166,12 @@ let _ = prerr_endline (">>>" ^ string_of_term (parse "(\\x. x y z z1 k) z1 z j")
 let problem_of_string s =
 prerr_endline (s);
  let lines = Str.split (Str.regexp "[\n\r\x0c\t;]+") s in
- let lines = List.map String.trim lines in
+ (* let lines = List.map String.trim lines in *)
  let lines = List.filter ((<>) "") lines in
  prerr_endline("number of lines" ^ string_of_int (List.length lines));
  let aux (last, name, div, conv, ps) line =
   let chr = String.sub line 0 1 in
-  let line = String.sub line 1 (String.length line - 1) in
+  let line = String.trim (String.sub line 1 (String.length line - 1)) in
   if line = "" then chr, name, div, conv, ps else
   let rec aux' chr line =
    if chr = "#"
@@ -184,15 +184,19 @@ prerr_endline (s);
     then chr, name, div, line::conv, ps
    else if chr = "N"
     then chr, name, div, conv, line::ps
-   else if last = ""
-    then raise (ParsingError ("Unexpected at beginning of problem: " ^ chr))
-   else aux' last (chr ^ line) in
+   else if chr = " "
+    then aux' last line
+   else raise (ParsingError
+     ("Unexpected at beginning of problem: `" ^ chr ^ "` " ^ line)) in
   aux' chr line in
- let _, name, div, conv, ps = List.fold_left aux ("#", "?", "", [], []) lines in
+ let _, name, div, conv, ps = List.fold_left aux ("#", "no label", "", [], []) lines in
  let div_provided = div <> "" in
  let div = if div_provided then div else "xxxxxx" in
  let strs = [div] @ ps @ conv in
 
+ if strs = ["BOT"]
+  then raise (ParsingError "empty problem");
+
  (* parse' *)
  let (tms, free) = parse_many strs in
  (* Fix arity *)
@@ -228,7 +232,7 @@ let ps = List.map (
 
 
 let from_file path =
- let lines = ref [] in
+ let lines = ref [""] in
  let chan = open_in path in
  let _ = try
   while true; do
@@ -237,6 +241,6 @@ let from_file path =
  with End_of_file ->
   close_in chan in
  let txt = String.concat "\n" (List.rev !lines) in
- let problems = Str.split (Str.regexp "\n\\$") txt in
+ let problems = Str.split (Str.regexp "[\n\r\x0c\t]+\\$") txt in
  List.map problem_of_string (List.tl (List.map ((^) "$") problems))
 ;;
diff --git a/ocaml/problems.ml b/ocaml/problems.ml
index cd57451..cb4218c 100644
--- a/ocaml/problems.ml
+++ b/ocaml/problems.ml
@@ -1,6 +1,22 @@
 open Lambda4;;
 open Util;;
 
+(* Syntax for problem files in problem/ folder:
+
+- dollar ($) on newline
+  begin new problem
+  $! means that the problem is expected to be separable,
+  $? means that it is expected to be unseparable
+
+- (#) on new line
+  comment line
+
+- (D) (C) (N) stand respectively for divergent, convergent, numeric
+
+- lines starting with spaces inherit the type from the last line
+
+*)
+
 let assert_separable x =
  match solve x with
  | `Separable _ -> ()
diff --git a/ocaml/problems/p b/ocaml/problems/p
index 6f1e062..a2155a6 100644
--- a/ocaml/problems/p
+++ b/ocaml/problems/p
@@ -1,3 +1,4 @@
+
 $! p2
 N x y
   x z
-- 
2.39.2