Add is_uppercase utility for utf8 strings

diff --git a/src/lua/lua_util.c b/src/lua/lua_util.c
index 32fc23fc118ed1ae90643fd1546147ce63659881..5568b874ae9ceca9f5025d7cb784b1dc038304e6 100644 (file)
--- a/src/lua/lua_util.c
+++ b/src/lua/lua_util.c
@@ -124,6 +124,15 @@ LUA_FUNCTION_DEF (util, parse_addr);
  */
 LUA_FUNCTION_DEF (util, fold_header);
 
+/***
+ * @function util.is_uppercase(str)
+ * Returns true if a string is all uppercase
+ *
+ * @param {string} str input string
+ * @return {bool} true if a string is all uppercase
+ */
+LUA_FUNCTION_DEF (util, is_uppercase);
+
 static const struct luaL_reg utillib_f[] = {
        LUA_INTERFACE_DEF (util, create_event_base),
        LUA_INTERFACE_DEF (util, load_rspamd_config),
@@ -137,6 +146,7 @@ static const struct luaL_reg utillib_f[] = {
        LUA_INTERFACE_DEF (util, levenshtein_distance),
        LUA_INTERFACE_DEF (util, parse_addr),
        LUA_INTERFACE_DEF (util, fold_header),
+       LUA_INTERFACE_DEF (util, is_uppercase),
        {NULL, NULL}
 };
 
@@ -625,6 +635,49 @@ lua_util_fold_header (lua_State *L)
        return 1;
 }
 
+static gint
+lua_util_is_uppercase (lua_State *L)
+{
+       const gchar *str, *p;
+       gsize sz, remain;
+       gunichar uc;
+       guint nlc = 0, nuc = 0;
+
+       str = luaL_checklstring (L, 1, &sz);
+       remain = sz;
+
+       if (str && remain > 0) {
+               while (remain > 0) {
+                       uc = g_utf8_get_char_validated (str, remain);
+                       p = g_utf8_next_char (str);
+
+                       if (p - str > (gint) remain) {
+                               break;
+                       }
+
+                       remain -= p - str;
+
+                       if (g_unichar_isupper (uc)) {
+                               nuc++;
+                       }
+                       else if (g_unichar_islower (uc)) {
+                               nlc++;
+                       }
+
+                       str = p;
+               }
+       }
+
+       if (nuc > 0 && nlc == 0) {
+               lua_pushboolean (L, TRUE);
+       }
+       else {
+               lua_pushboolean (L, FALSE);
+       }
+
+       return 1;
+}
+
 static gint
 lua_load_util (lua_State * L)
 {