tags: Re-implement tags iterator to avoid having C++ in the interface

We want to be able to iterate over tags stored in various ways, so
the previous TermIterator-based tags object just wasn't general
enough. The new interface is nice and simple, and involves only
C datatypes.

1 files changed, 0 insertions, 157 deletions

diff --git a/tags.cc b/tags.cc
deleted file mode 100644
index a921c60..0000000
--- a/tags.cc
+++ /dev/null
@@ -1,157 +0,0 @@
-/* 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>
-
-typedef struct _notmuch_terms {
-    char prefix_char;
-    Xapian::TermIterator iterator;
-    Xapian::TermIterator iterator_end;
-} notmuch_terms_t;
-
-struct _notmuch_tags {
-    notmuch_terms_t terms;
-};
-
-notmuch_terms_t *
-_notmuch_terms_create (void *ctx,
-		       Xapian::Document doc,
-		       const char *prefix_name);
-
-/* The assertion is to ensure that 'type' is a derivative of
- * notmuch_terms_t in that it contains a notmuch_terms_t as its first
- * member. We do this by name of 'terms' as opposed to type, because
- * that's as clever as I've been so far. */
-#define _notmuch_terms_create_type(ctx, doc, prefix_name, type) \
-    (COMPILE_TIME_ASSERT(offsetof(type, terms) == 0),		\
-     (type *) _notmuch_terms_create (ctx, doc, prefix_name))
-
-/* 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_tags_t *
-_notmuch_tags_create_terms (void *ctx,
-			    Xapian::Document doc,
-			    const char *prefix_name)
-{
-    return _notmuch_terms_create_type (ctx, doc, prefix_name, notmuch_tags_t);
-}
-
-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);
-}