X-Git-Url: https://fleuret.org/cgi-bin/gitweb/gitweb.cgi?a=blobdiff_plain;f=rpl.py;h=b51edefcce07b40e01a984f5e263dc944bc01342;hb=b59fca62aa31de18a3e0cd0bb54e395d4b1254ae;hp=8d31efe439c40b91cb80b7a8167f8f41ae31b9df;hpb=cd5e4647e105a10012d687169d49bec0343e274f;p=picoclvr.git

diff --git a/rpl.py b/rpl.py
index 8d31efe..b51edef 100755
--- a/rpl.py
+++ b/rpl.py
@@ -105,15 +105,21 @@ def decompose(seq):
     k = 0
     while seq[k] == "<input>":
         o = next_marker(seq, ["<output>"], start=k + 1)
+        if o is None:
+            raise ValueError("Missing output markers (should be correct in the prompt)")
         e = next_marker(seq, ["<input>", "<prog>"], start=o)
-        if o is None or e is None:
-            raise ValueError("Invalid input/output")
+        if e is None:
+            raise ValueError(
+                "Missing input/output markers (should be correct in the prompt)"
+            )
         try:
             io.append(
                 ([int(x) for x in seq[k + 1 : o]], [int(x) for x in seq[o + 1 : e]])
             )
         except ValueError:
-            raise ValueError("Invalid input/output")
+            raise ValueError(
+                "Invalid input/output value (should be correct in the prompt)"
+            )
 
         k = e
 
@@ -123,9 +129,18 @@ def decompose(seq):
             prog = []
         else:
             prog = seq[k + 1 : e]
+    else:
+        raise ValueError("Missing <prog> (it should be in the prompt)")
+
     return prog, io
 
 
+def stack_distance(target_stack, result_stack):
+    return abs(len(result_stack) - len(target_stack)) + sum(
+        [0 if x == y else 1 for x, y in zip(result_stack, target_stack)]
+    )
+
+
 def compute_nb_errors(seq):
     prog, io = decompose(seq)
 
@@ -145,9 +160,7 @@ def compute_nb_errors(seq):
         for start_stack, target_stack in io:
             result_stack = rpl_exec(prog, start_stack)
             nb_total += len(target_stack)
-            e = abs(len(result_stack) - len(target_stack)) + sum(
-                [0 if x == y else 1 for x, y in zip(result_stack, target_stack)]
-            )
+            e = stack_distance(target_stack, result_stack)
             nb_errors += e
             stacks.append((start_stack, target_stack, result_stack, e == 0))