From 42d05c8a3f59f99daccaf65a117d183828446d71 Mon Sep 17 00:00:00 2001
From: Igor Pashev <pashev.igor@gmail.com>
Date: Thu, 29 Sep 2022 09:56:15 +0200
Subject: Test the longest tail

---
 mendeleev.c   | 9 ++-------
 mendeleev.f90 | 6 +-----
 mendeleev.py  | 8 +-------
 3 files changed, 4 insertions(+), 19 deletions(-)

diff --git a/mendeleev.c b/mendeleev.c
index 44e2cb4..81127dd 100644
--- a/mendeleev.c
+++ b/mendeleev.c
@@ -150,18 +150,13 @@ explode (const char *word)
   if (!formula)
     return NULL;
 
-  while (*word)
+  while (*formula->tail)
     {
-      word = NULL;
       formula_t *f = formula;
       while (f)
         {
           if (*f->tail)
-            {
-              advance (f);
-              if (!word)
-                word = f->tail;
-            }
+            advance (f);
           f = f->next;
         }
     }
diff --git a/mendeleev.f90 b/mendeleev.f90
index c7df836..5abe2a4 100644
--- a/mendeleev.f90
+++ b/mendeleev.f90
@@ -171,23 +171,19 @@ contains
       character(len=*), intent(in) :: word
       type(formula_t), pointer :: formula
 
-      logical :: has_tail
       type(formula_t), pointer :: f
 
       allocate(formula)
       allocate(formula%elements(len(word)))
 
-      do
+      do while (formula%tail <= len(word))
          f => formula
-         has_tail = .false.
          do while (associated(f))
             if (f%tail <= len(word)) then
                call advance(word, f)
-               if (.not. has_tail) has_tail = f%tail <= len(word)
             end if
             f => f%next
          end do
-         if (.not. has_tail) exit
       end do
    end function explode
 end program mendeleev
diff --git a/mendeleev.py b/mendeleev.py
index a9615aa..21bc600 100644
--- a/mendeleev.py
+++ b/mendeleev.py
@@ -76,23 +76,17 @@ def advance(els, tail):
 
 def explode(word):
     result = [([], word.lower().encode())]
-    while True:
+    while result[0][1]:
         new = []
-        tail = None
         for res in result:
             if res[1]:
                 adv = advance(*res)
                 new.extend(adv)
-                if not tail:
-                    tail = adv[0][1]
             else:
                 new.append(res)
 
         result = new
 
-        if not tail:
-            break
-
     return [els for els, _ in result]
 
 
-- 
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