tagtree/tagcache add new clause operators begins/ends _oneof

new operators @^, @$
begins_oneof and ends_oneof

albumartist @^ "L|The L"
Led Zeppelin, The look

albumartist @$ "girls|Boys"
spice girls, beasty boys

Change-Id: I26ce3d8155d970a55e003f74e2f9478db76204f1

apps/tagcache.c

@@ -162,6 +162,8 @@ static const char *tag_type_str[] = {
     [clause_ends_with] = "clause_ends_with",
     [clause_not_ends_with] = "clause_not_ends_with",
     [clause_oneof] = "clause_oneof",
+    [clause_begins_oneof] = "clause_begins_oneof",
+    [clause_ends_oneof] = "clause_ends_oneof",
     [clause_logical_or] = "clause_logical_or"
  };
 #define logf_clauses logf
@@ -1052,6 +1054,25 @@ inline static bool str_oneof(const char *str, const char *list)
     return false;
 }
 
+inline static bool str_begins_ends_oneof(const char *str, const char *list, bool begins)
+{
+    logf_clauses("%s %s (%s) %s", str, __func__, begins ? "begins" : "ends", list);
+    const char *sep;
+    int l, p, len = strlen(str);
+
+    while (*list)
+    {
+        sep = strchr(list, '|');
+        l = sep ? (intptr_t)sep - (intptr_t)list : (int)strlen(list);
+        p = begins ? 0 : len - l;
+        if (l <= len && !strncasecmp(&str[p], list, l))
+            return true;
+        list += sep ? l + 1 : l;
+    }
+
+    return false;
+}
+
 static bool check_against_clause(long numeric, const char *str,
                                  const struct tagcache_search_clause *clause)
 {
@@ -1105,6 +1126,10 @@ static bool check_against_clause(long numeric, const char *str,
                 return !str_ends_with(str, clause->str);
             case clause_oneof:
                 return str_oneof(str, clause->str);
+            case clause_begins_oneof:
+                return str_begins_ends_oneof(str, clause->str, true);
+            case clause_ends_oneof:
+                return str_begins_ends_oneof(str, clause->str, false);
             default:
                 logf("Incorrect tag: %d", clause->type);
         }

apps/tagcache.h

@@ -127,7 +127,9 @@ enum tag_type { tag_artist = 0, tag_album, tag_genre, tag_title,
 enum clause { clause_none, clause_is, clause_is_not, clause_gt, clause_gteq,
     clause_lt, clause_lteq, clause_contains, clause_not_contains, 
     clause_begins_with, clause_not_begins_with, clause_ends_with,
-    clause_not_ends_with, clause_oneof, clause_logical_or };
+    clause_not_ends_with, clause_oneof,
+    clause_begins_oneof, clause_ends_oneof,
+    clause_logical_or };
 
 struct tagcache_stat {
     bool initialized;        /* Is tagcache currently busy? */

apps/tagtree.c

@@ -418,6 +418,8 @@ static int get_clause(int *condition)
         CLAUSE('!', '^', clause_not_begins_with),
         CLAUSE('$', ' ', clause_ends_with),
         CLAUSE('!', '$', clause_not_ends_with),
+        CLAUSE('@', '^', clause_begins_oneof),
+        CLAUSE('@', '$', clause_ends_oneof),
         CLAUSE('@', ' ', clause_oneof)
     };