lib: add date range query support

[notmuch] / lib / parse-time-vrp.cc

diff --git a/lib/parse-time-vrp.cc b/lib/parse-time-vrp.cc
new file mode 100644 (file)
index 0000000..33f07db
--- /dev/null
+++ b/lib/parse-time-vrp.cc
@@ -0,0 +1,61 @@
+/* parse-time-vrp.cc - date range query glue
+ *
+ * This file is part of notmuch.
+ *
+ * Copyright © 2012 Jani Nikula
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see http://www.gnu.org/licenses/ .
+ *
+ * Author: Jani Nikula <jani@nikula.org>
+ */
+
+#include "database-private.h"
+#include "parse-time-vrp.h"
+#include "parse-time-string.h"
+
+#define PREFIX "date:"
+
+/* See *ValueRangeProcessor in xapian-core/api/valuerangeproc.cc */
+Xapian::valueno
+ParseTimeValueRangeProcessor::operator() (std::string &begin, std::string &end)
+{
+    time_t t, now;
+
+    /* Require date: prefix in start of the range... */
+    if (STRNCMP_LITERAL (begin.c_str (), PREFIX))
+       return Xapian::BAD_VALUENO;
+
+    /* ...and remove it. */
+    begin.erase (0, sizeof (PREFIX) - 1);
+
+    /* Use the same 'now' for begin and end. */
+    if (time (&now) == (time_t) -1)
+       return Xapian::BAD_VALUENO;
+
+    if (!begin.empty ()) {
+       if (parse_time_string (begin.c_str (), &t, &now, PARSE_TIME_ROUND_DOWN))
+           return Xapian::BAD_VALUENO;
+
+       begin.assign (Xapian::sortable_serialise ((double) t));
+    }
+
+    if (!end.empty ()) {
+       if (parse_time_string (end.c_str (), &t, &now, PARSE_TIME_ROUND_UP_INCLUSIVE))
+           return Xapian::BAD_VALUENO;
+
+       end.assign (Xapian::sortable_serialise ((double) t));
+    }
+
+    return valno;
+}