Move terms and tags code to a new tags.cc file.

We want to start using this from both message.cc and thread.cc so we
need it in a place we can share the code. This also requires a new
notmuch-private-cxx.h header file for interfaces that include
C++-specific datatypes (such as Xapian::Document).

1 files changed, 126 insertions, 0 deletions

diff --git a/tags.cc b/tags.cc
new file mode 100644
index 0000000..4fc06c0
--- /dev/null
+++ b/tags.cc
@@ -0,0 +1,126 @@
+/* tags.cc - Iterator for tags returned from message or thread
+ *
+ * Copyright © 2009 Carl Worth
+ *
+ * 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: Carl Worth <cworth@cworth.org>
+ */
+
+#include "notmuch-private-cxx.h"
+#include "database-private.h"
+
+#include <xapian.h>
+
+/* We end up having to call the destructors explicitly because we had
+ * to use "placement new" in order to initialize C++ objects within a
+ * block that we allocated with talloc. So C++ is making talloc
+ * slightly less simple to use, (we wouldn't need
+ * talloc_set_destructor at all otherwise).
+ */
+static int
+_notmuch_terms_destructor (notmuch_terms_t *terms)
+{
+    terms->iterator.~TermIterator ();
+    terms->iterator_end.~TermIterator ();
+
+    return 0;
+}
+
+notmuch_terms_t *
+_notmuch_terms_create (void *ctx,
+		       Xapian::Document doc,
+		       const char *prefix_name)
+{
+    notmuch_terms_t *terms;
+    const char *prefix = _find_prefix (prefix_name);
+
+    /* Currently, notmuch_terms_t is written with the assumption that
+     * any prefix its derivatives use will be only a single
+     * character. */
+    assert (strlen (prefix) == 1);
+
+    terms = talloc (ctx, notmuch_terms_t);
+    if (unlikely (terms == NULL))
+	return NULL;
+
+    terms->prefix_char = *prefix;
+    new (&terms->iterator) Xapian::TermIterator;
+    new (&terms->iterator_end) Xapian::TermIterator;
+
+    talloc_set_destructor (terms, _notmuch_terms_destructor);
+
+    terms->iterator = doc.termlist_begin ();
+    terms->iterator.skip_to (prefix);
+    terms->iterator_end = doc.termlist_end ();
+
+    return terms;
+}
+
+static notmuch_bool_t
+_notmuch_terms_has_more (notmuch_terms_t *terms)
+{
+    std::string s;
+
+    if (terms->iterator == terms->iterator_end)
+	return FALSE;
+
+    s = *terms->iterator;
+    if (! s.empty () && s[0] == terms->prefix_char)
+	return TRUE;
+    else
+	return FALSE;
+}
+
+static const char *
+_notmuch_terms_get (notmuch_terms_t *terms)
+{
+    return talloc_strdup (terms, (*terms->iterator).c_str () + 1);
+}
+
+static void
+_notmuch_terms_advance (notmuch_terms_t *terms)
+{
+    terms->iterator++;
+}
+
+static void
+_notmuch_terms_destroy (notmuch_terms_t *terms)
+{
+    talloc_free (terms);
+}
+
+notmuch_bool_t
+notmuch_tags_has_more (notmuch_tags_t *tags)
+{
+    return _notmuch_terms_has_more (&tags->terms);
+}
+
+const char *
+notmuch_tags_get (notmuch_tags_t *tags)
+{
+    return _notmuch_terms_get (&tags->terms);
+}
+
+void
+notmuch_tags_advance (notmuch_tags_t *tags)
+{
+    return _notmuch_terms_advance (&tags->terms);
+}
+
+void
+notmuch_tags_destroy (notmuch_tags_t *tags)
+{
+    return _notmuch_terms_destroy (&tags->terms);
+}