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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
// Take a look at the license at the top of the repository in the LICENSE file.

use crate::Bitset;
use glib::translate::*;
use std::marker::PhantomData;

/// An opaque, stack-allocated struct for iterating
/// over the elements of a [`Bitset`][crate::Bitset].
///
/// Before a [`BitsetIter`][crate::BitsetIter] can be used, it needs to be initialized with
/// [`init_first()`][Self::init_first()], [`init_last()`][Self::init_last()]
/// or [`init_at()`][Self::init_at()].
#[derive(Copy, Clone)]
#[doc(alias = "GtkBitsetIter")]
pub struct BitsetIter<'a>(ffi::GtkBitsetIter, PhantomData<&'a Bitset>);

impl<'a> BitsetIter<'a> {
    #[doc(alias = "gtk_bitset_iter_init_at")]
    pub fn init_at(set: &'a Bitset, target: u32) -> Option<(Self, u32)> {
        assert_initialized_main_thread!();
        unsafe {
            let mut iter = std::mem::MaybeUninit::uninit();
            let mut value = std::mem::MaybeUninit::uninit();
            let found: bool = from_glib(ffi::gtk_bitset_iter_init_at(
                iter.as_mut_ptr(),
                set.to_glib_none().0,
                target,
                value.as_mut_ptr(),
            ));

            if found {
                Some((
                    BitsetIter(iter.assume_init(), PhantomData),
                    value.assume_init(),
                ))
            } else {
                None
            }
        }
    }

    #[doc(alias = "gtk_bitset_iter_init_first")]
    pub fn init_first(set: &'a Bitset) -> Option<(Self, u32)> {
        assert_initialized_main_thread!();
        unsafe {
            let mut iter = std::mem::MaybeUninit::uninit();
            let mut value = std::mem::MaybeUninit::uninit();
            let found: bool = from_glib(ffi::gtk_bitset_iter_init_first(
                iter.as_mut_ptr(),
                set.to_glib_none().0,
                value.as_mut_ptr(),
            ));
            if found {
                Some((
                    BitsetIter(iter.assume_init(), PhantomData),
                    value.assume_init(),
                ))
            } else {
                None
            }
        }
    }

    #[doc(alias = "gtk_bitset_iter_init_last")]
    pub fn init_last(set: &'a Bitset) -> Option<(Self, u32)> {
        assert_initialized_main_thread!();
        unsafe {
            let mut iter = std::mem::MaybeUninit::uninit();
            let mut value = std::mem::MaybeUninit::uninit();
            let found: bool = from_glib(ffi::gtk_bitset_iter_init_last(
                iter.as_mut_ptr(),
                set.to_glib_none().0,
                value.as_mut_ptr(),
            ));
            if found {
                Some((
                    BitsetIter(iter.assume_init(), PhantomData),
                    value.assume_init(),
                ))
            } else {
                None
            }
        }
    }

    #[doc(alias = "gtk_bitset_iter_get_value")]
    pub fn value(&self) -> u32 {
        unsafe { ffi::gtk_bitset_iter_get_value(self.to_glib_none().0) }
    }

    #[doc(alias = "gtk_bitset_iter_is_valid")]
    pub fn is_valid(&self) -> bool {
        unsafe { from_glib(ffi::gtk_bitset_iter_is_valid(self.to_glib_none().0)) }
    }

    #[doc(alias = "gtk_bitset_iter_previous")]
    pub fn previous(&mut self) -> Option<u32> {
        unsafe {
            let mut value = std::mem::MaybeUninit::uninit();

            let found: bool = from_glib(ffi::gtk_bitset_iter_previous(
                &mut self.0 as *mut _,
                value.as_mut_ptr(),
            ));
            if found {
                Some(value.assume_init())
            } else {
                None
            }
        }
    }
}

impl<'a> Iterator for BitsetIter<'a> {
    type Item = u32;

    #[doc(alias = "gtk_bitset_iter_next")]
    fn next(&mut self) -> Option<Self::Item> {
        unsafe {
            let mut value = std::mem::MaybeUninit::uninit();

            let found: bool = from_glib(ffi::gtk_bitset_iter_next(
                &mut self.0 as *mut _,
                value.as_mut_ptr(),
            ));
            if found {
                Some(value.assume_init())
            } else {
                None
            }
        }
    }
}

#[doc(hidden)]
impl<'a> ToGlibPtr<'a, *const ffi::GtkBitsetIter> for BitsetIter<'a> {
    type Storage = &'a Self;

    #[inline]
    fn to_glib_none(&'a self) -> Stash<*const ffi::GtkBitsetIter, Self> {
        Stash(&self.0 as *const ffi::GtkBitsetIter, self)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::test_synced;

    #[test]
    fn test_bitset_iter() {
        test_synced(move || {
            let set = Bitset::new_range(0, 20);
            let (mut iter, init_value) = BitsetIter::init_first(&set).unwrap();
            assert_eq!(init_value, 0);
            assert_eq!(iter.next(), Some(1));
            assert_eq!(iter.previous(), Some(0));

            let set2 = Bitset::new_range(0, 3);
            let (mut iter, init_val) = BitsetIter::init_last(&set2).unwrap();
            assert_eq!(init_val, 2);
            assert_eq!(iter.previous(), Some(1));
            assert_eq!(iter.previous(), Some(0));
            assert_eq!(iter.previous(), None);
            assert!(!iter.is_valid());
            assert_eq!(iter.next(), Some(1));
            assert!(iter.is_valid());
        });
    }
}