Files
cairo
cairo_sys
gdk_pixbuf
gdk_pixbuf_sys
gio
auto
action.rsaction_group.rsaction_map.rsapp_info.rsapp_info_monitor.rsapp_launch_context.rsapplication.rsapplication_command_line.rsasync_result.rsbuffered_input_stream.rsbuffered_output_stream.rsbytes_icon.rscancellable.rscharset_converter.rsconstants.rsconverter.rsconverter_input_stream.rsconverter_output_stream.rscredentials.rsdata_input_stream.rsdata_output_stream.rsdbus_action_group.rsdbus_arg_info.rsdbus_auth_observer.rsdbus_connection.rsdbus_interface.rsdbus_interface_info.rsdbus_interface_skeleton.rsdbus_menu_model.rsdbus_message.rsdbus_method_info.rsdbus_method_invocation.rsdbus_node_info.rsdbus_object.rsdbus_property_info.rsdbus_proxy.rsdbus_server.rsdbus_signal_info.rsdesktop_app_info.rsdrive.rsemblem.rsemblemed_icon.rsenums.rsfile.rsfile_attribute_matcher.rsfile_enumerator.rsfile_icon.rsfile_info.rsfile_input_stream.rsfile_io_stream.rsfile_monitor.rsfile_output_stream.rsfilename_completer.rsfilter_input_stream.rsfilter_output_stream.rsflags.rsfunctions.rsicon.rsinet_address.rsinet_address_mask.rsinet_socket_address.rsinput_stream.rsio_stream.rslist_model.rslist_store.rsloadable_icon.rsmemory_input_stream.rsmemory_monitor.rsmemory_output_stream.rsmenu.rsmenu_attribute_iter.rsmenu_item.rsmenu_link_iter.rsmenu_model.rsmod.rsmount.rsmount_operation.rsnetwork_address.rsnetwork_monitor.rsnetwork_service.rsnotification.rsoutput_stream.rspermission.rspollable_input_stream.rspollable_output_stream.rsproperty_action.rsproxy.rsproxy_address.rsproxy_resolver.rsremote_action_group.rsresolver.rsresource.rsseekable.rssettings.rssettings_backend.rssettings_schema.rssettings_schema_key.rssettings_schema_source.rssimple_action.rssimple_action_group.rssimple_io_stream.rssimple_permission.rssocket.rssocket_address.rssocket_address_enumerator.rssocket_client.rssocket_connectable.rssocket_connection.rssocket_listener.rssocket_service.rssrv_target.rssubprocess.rssubprocess_launcher.rstask.rstcp_connection.rsthemed_icon.rsthreaded_socket_service.rstls_backend.rstls_certificate.rstls_client_connection.rstls_connection.rstls_database.rstls_file_database.rstls_interaction.rstls_password.rstls_server_connection.rsunix_fd_list.rsunix_input_stream.rsunix_mount_entry.rsunix_mount_point.rsunix_output_stream.rsunix_socket_address.rsvfs.rsvolume.rsvolume_monitor.rszlib_compressor.rszlib_decompressor.rs
subclass
gio_sys
glib
glib_macros
glib_sys
gobject_sys
graphene
graphene_sys
pango
pango_cairo_sys
pango_sys
pangocairo
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
// Take a look at the license at the top of the repository in the LICENSE file.

// This is similar to the GVariantIter provided by glib, but that would
// introduce a heap allocation and doesn't provide a way to determine how
// many items are left in the iterator.

use std::iter::{DoubleEndedIterator, ExactSizeIterator, Iterator};

use crate::variant::Variant;

/// Iterator over items in a variant.
#[derive(Debug)]
pub struct VariantIter {
    variant: Variant,
    head: usize,
    tail: usize,
}

impl VariantIter {
    pub(crate) fn new(variant: Variant) -> Self {
        let tail = variant.n_children();
        Self {
            variant,
            head: 0,
            tail,
        }
    }
}

impl Iterator for VariantIter {
    type Item = Variant;

    fn next(&mut self) -> Option<Variant> {
        if self.head == self.tail {
            None
        } else {
            let value = self.variant.child_value(self.head);
            self.head += 1;
            Some(value)
        }
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        let size = self.tail - self.head;
        (size, Some(size))
    }
}

impl DoubleEndedIterator for VariantIter {
    fn next_back(&mut self) -> Option<Variant> {
        if self.head == self.tail {
            None
        } else {
            self.tail -= 1;
            Some(self.variant.child_value(self.tail))
        }
    }
}

impl ExactSizeIterator for VariantIter {}

#[cfg(test)]
mod tests {
    use crate::prelude::*;
    use crate::variant::{DictEntry, Variant};
    use std::collections::HashMap;

    #[test]
    fn test_variant_iter_variant() {
        let v = Variant::from_variant(&"foo".to_string().to_variant());
        let vec: Vec<String> = v.iter().map(|i| i.get().unwrap()).collect();
        assert_eq!(vec, vec!["foo".to_string()]);
    }

    #[test]
    fn test_variant_iter_array() {
        let v = Variant::from_array::<String>(&[
            "foo".to_string().to_variant(),
            "bar".to_string().to_variant(),
        ]);
        let vec: Vec<String> = v.iter().map(|i| i.get().unwrap()).collect();
        assert_eq!(vec, vec!["foo".to_string(), "bar".to_string()]);
    }

    #[test]
    fn test_variant_iter_tuple() {
        let v = Variant::from_tuple(&[
            "foo".to_string().to_variant(),
            "bar".to_string().to_variant(),
        ]);
        let vec: Vec<String> = v.iter().map(|i| i.get().unwrap()).collect();
        assert_eq!(vec, vec!["foo".to_string(), "bar".to_string()]);
    }

    #[test]
    fn test_variant_iter_dictentry() {
        let v = DictEntry::new("foo", 1337).to_variant();
        println!("{:?}", v.iter().collect::<Vec<_>>());
        assert_eq!(v.iter().count(), 2);
    }

    #[test]
    fn test_variant_iter_map() {
        let mut map = HashMap::new();
        map.insert("foo", 1);
        map.insert("bar", 1);
        let v = map.to_variant();
        assert_eq!(v.iter().count(), 2);
    }
}