# HG changeset patch
# User Christian Brabandt <cb@256bit.org>
# Date 1473445807 -7200
# Node ID 4acacf4081ce6d575a7ff7dd10ecd5a5ff70db0f
# Parent  fbb82155b1e239dc936a986633f36da0b660a39d
commit https://github.com/vim/vim/commit/16b3578f355282846f2600ce77fb344950f0b9ce
Author: Bram Moolenaar <Bram@vim.org>
Date:   Fri Sep 9 20:29:50 2016 +0200

    patch 7.4.2355
    Problem:    Regexp fails to match when using "\>\)\?". (Ramel)
    Solution:   When a state is already in the list, but addstate_here() is used
                and the existing state comes later, add the new state anyway.

diff --git a/src/regexp_nfa.c b/src/regexp_nfa.c
--- a/src/regexp_nfa.c
+++ b/src/regexp_nfa.c
@@ -4340,6 +4340,9 @@ state_in_list(
     return FALSE;
 }
 
+/* Offset used for "off" by addstate_here(). */
+#define ADDSTATE_HERE_OFFSET 10
+
 /*
  * Add "state" and possibly what follows to state list ".".
  * Returns "subs_arg", possibly copied into temp_subs.
@@ -4350,9 +4353,14 @@ addstate(
     nfa_state_T		*state,	    /* state to update */
     regsubs_T		*subs_arg,  /* pointers to subexpressions */
     nfa_pim_T		*pim,	    /* postponed look-behind match */
-    int			off)	    /* byte offset, when -1 go to next line */
+    int			off_arg)    /* byte offset, when -1 go to next line */
 {
     int			subidx;
+    int			off = off_arg;
+    int			add_here = FALSE;
+    int			listindex = 0;
+    int			k;
+    int			found = FALSE;
     nfa_thread_T	*thread;
     struct multipos	save_multipos;
     int			save_in_use;
@@ -4365,6 +4373,13 @@ addstate(
     int			did_print = FALSE;
 #endif
 
+    if (off_arg <= -ADDSTATE_HERE_OFFSET)
+    {
+	add_here = TRUE;
+	off = 0;
+	listindex = -(off_arg + ADDSTATE_HERE_OFFSET);
+    }
+
     switch (state->c)
     {
 	case NFA_NCLOSE:
@@ -4448,13 +4463,28 @@ addstate(
 		if (!nfa_has_backref && pim == NULL && !l->has_pim
 						     && state->c != NFA_MATCH)
 		{
+		    /* When called from addstate_here() do insert before
+		     * existing states. */
+		    if (add_here)
+		    {
+			for (k = 0; k < l->n && k < listindex; ++k)
+			    if (l->t[k].state->id == state->id)
+			    {
+				found = TRUE;
+				break;
+			    }
+		    }
+		    if (!add_here || found)
+		    {
 skip_add:
 #ifdef ENABLE_LOG
-		    nfa_set_code(state->c);
-		    fprintf(log_fd, "> Not adding state %d to list %d. char %d: %s\n",
-			    abs(state->id), l->id, state->c, code);
+			nfa_set_code(state->c);
+			fprintf(log_fd, "> Not adding state %d to list %d. char %d: %s pim: %s has_pim: %d found: %d\n",
+			    abs(state->id), l->id, state->c, code,
+			    pim == NULL ? "NULL" : "yes", l->has_pim, found);
 #endif
-		    return subs;
+			return subs;
+		    }
 		}
 
 		/* Do not add the state again when it exists with the same
@@ -4519,14 +4549,14 @@ skip_add:
 
 	case NFA_SPLIT:
 	    /* order matters here */
-	    subs = addstate(l, state->out, subs, pim, off);
-	    subs = addstate(l, state->out1, subs, pim, off);
+	    subs = addstate(l, state->out, subs, pim, off_arg);
+	    subs = addstate(l, state->out1, subs, pim, off_arg);
 	    break;
 
 	case NFA_EMPTY:
 	case NFA_NOPEN:
 	case NFA_NCLOSE:
-	    subs = addstate(l, state->out, subs, pim, off);
+	    subs = addstate(l, state->out, subs, pim, off_arg);
 	    break;
 
 	case NFA_MOPEN:
@@ -4626,7 +4656,7 @@ skip_add:
 		sub->list.line[subidx].start = reginput + off;
 	    }
 
-	    subs = addstate(l, state->out, subs, pim, off);
+	    subs = addstate(l, state->out, subs, pim, off_arg);
 	    /* "subs" may have changed, need to set "sub" again */
 #ifdef FEAT_SYN_HL
 	    if (state->c >= NFA_ZOPEN && state->c <= NFA_ZOPEN9)
@@ -4652,7 +4682,7 @@ skip_add:
 			: subs->norm.list.line[0].end != NULL))
 	    {
 		/* Do not overwrite the position set by \ze. */
-		subs = addstate(l, state->out, subs, pim, off);
+		subs = addstate(l, state->out, subs, pim, off_arg);
 		break;
 	    }
 	case NFA_MCLOSE1:
@@ -4725,7 +4755,7 @@ skip_add:
 		vim_memset(&save_multipos, 0, sizeof(save_multipos));
 	    }
 
-	    subs = addstate(l, state->out, subs, pim, off);
+	    subs = addstate(l, state->out, subs, pim, off_arg);
 	    /* "subs" may have changed, need to set "sub" again */
 #ifdef FEAT_SYN_HL
 	    if (state->c >= NFA_ZCLOSE && state->c <= NFA_ZCLOSE9)
@@ -4762,8 +4792,10 @@ addstate_here(
     int count;
     int listidx = *ip;
 
-    /* first add the state(s) at the end, so that we know how many there are */
-    addstate(l, state, subs, pim, 0);
+    /* First add the state(s) at the end, so that we know how many there are.
+     * Pass the listidx as offset (avoids adding another argument to
+     * addstate(). */
+    addstate(l, state, subs, pim, -listidx - ADDSTATE_HERE_OFFSET);
 
     /* when "*ip" was at the end of the list, nothing to do */
     if (listidx + 1 == tlen)
diff --git a/src/testdir/test_regexp_latin.vim b/src/testdir/test_regexp_latin.vim
--- a/src/testdir/test_regexp_latin.vim
+++ b/src/testdir/test_regexp_latin.vim
@@ -53,3 +53,12 @@ func Test_nested_backrefs()
   bwipe!
   set re=0
 endfunc
+
+func Test_eow_with_optional()
+  let expected = ['abc def', 'abc', 'def', '', '', '', '', '', '', '']
+  for re in range(0, 2)
+    exe 'set re=' . re
+    let actual = matchlist('abc def', '\(abc\>\)\?\s*\(def\)')
+    call assert_equal(expected, actual)
+  endfor
+endfunc
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -764,6 +764,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2355,
+/**/
     2354,
 /**/
     2353,