From: K.Kosako <kkosako0@gmail.com>
Date: Thu, 4 Oct 2018 12:23:47 +0000 (+0900)
Subject: expand case fold if string is a single character case
X-Git-Tag: v6.9.1~18^2~20
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=77a94ce9b3956188b40a9a1ff63cbdc386d8aa7d;p=onig

expand case fold if string is a single character case
---

diff --git a/src/regcomp.c b/src/regcomp.c
index 8e83266..31a8e35 100644
--- a/src/regcomp.c
+++ b/src/regcomp.c
@@ -3664,7 +3664,10 @@ expand_case_fold_string(Node* node, regex_t* reg)
     len = enclen(reg->enc, p);
     is_good = is_good_case_fold_items_for_search(reg->enc, len, n, items);
 
-    if (is_good || IS_NOT_NULL(snode)) {
+    if (IS_NOT_NULL(snode) ||
+	(is_good &&
+	 /* expand single char case: ex. /(?i:a)/ */
+	 !(p == start && p + len >= end))) {
       if (IS_NULL(snode)) {
         if (IS_NULL(root) && IS_NOT_NULL(prev_node)) {
           top_root = root = onig_node_list_add(NULL_NODE, prev_node);