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

//! `Tree`/`Forest` implemented in last-child/next-sibling `Node`s, allocated on heap, with size information tracked.

pub mod tree;
pub use self::tree::Tree; 

pub mod forest;
pub use self::forest::Forest; 

pub mod node;
pub use self::node::Node;
pub(crate) use self::node::Link;

pub mod notation;
pub use self::notation::{tr,fr}; 

pub mod iter;
pub use self::iter::{Iter,IterMut};

pub mod onto_iter;
pub use self::onto_iter::{Subnode,OntoIter}; 

pub mod heap;

pub mod walk;
pub use self::walk::{Visit,TreeWalk,ForestWalk};

use super::bfs;
use super::Size;

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

    #[cfg(feature="no_std")] extern crate alloc;
    #[cfg(feature="no_std")] use self::alloc::string::ToString;

    #[test]
    fn tree_drop() {
        struct I( i32, *mut usize );

        fn i( value: i32, pcount: *mut usize ) -> Tree<I> {
            unsafe{ *pcount += 1; }
            tr( I( value, pcount ))
        }

        impl Drop for I {
            fn drop( &mut self ) {
                unsafe { *(self.1) -= 1; }
            }
        }

        impl Debug for I {
            fn fmt( &self, f: &mut Formatter ) -> fmt::Result {
                write!( f, "{}", self.0 )
            }
        }

        let mut count:usize = 0;
        let c = &mut count as *mut usize;
        let tree = i(0,c) /( i(1,c)/i(2,c)/i(3,c) ) /( i(4,c)/i(5,c)/i(6,c) );
        assert_eq!( count, 7 );
        drop( tree );
        assert_eq!( count, 0 );
    }

    #[test]
    fn tree_equal() {
        let tr1 = tr(0) /tr(1)/tr(2);
        let tr2 = tr(0) /tr(1)/tr(2);
        let tr3 = tr(0) /tr(1)/tr(3);
        assert!( tr1 == tr2 );
        assert!( tr1 != tr3 );
    }

    #[test]
    fn notation() {
        let classic =
            tr(0) /(
                -( tr(1) /( -tr(2)-tr(3) ) )
                -( tr(4) /( -tr(5)-tr(6) ) )
            );
        let mordern = tr(0) /( tr(1)/tr(2)/tr(3) ) /( tr(4)/tr(5)/tr(6) );
        assert_eq!( classic.to_string(), "0( 1( 2 3 ) 4( 5 6 ) )" );
        assert_eq!( mordern.to_string(), "0( 1( 2 3 ) 4( 5 6 ) )" );
    }

    #[test]
    fn forest_from() {
        let trees = [ tr(0), tr(1)/tr(2)/tr(3), tr(4)/tr(5)/tr(6) ];
        let forest = trees.iter().cloned().collect::<Forest<_>>();
        assert_eq!( forest, tr(0) - tr(1)/tr(2)/tr(3) - tr(4)/tr(5)/tr(6) );
    }

    #[test]
    fn forest_into() {
        let forest = tr(0) - tr(1)/tr(2)/tr(3) - tr(4)/tr(5)/tr(6);
        let mut iter = forest.into_iter();
        assert_eq!( iter.next().unwrap(), tr(0) );
        assert_eq!( iter.next().unwrap(), tr(1)/tr(2)/tr(3) );
        assert_eq!( iter.next().unwrap(), tr(4)/tr(5)/tr(6) );
        assert_eq!( iter.next(), None );
    }


    #[test]
    fn tree_extend() {
        let mut tree = tr(0) /tr(1);
        tree.extend( tr(2)-tr(3) );
        assert_eq!( tree, tr(0) /tr(1)/tr(2)/tr(3) );
    }

    #[test]
    fn forest_extend() {
        let mut forest = tr(1)-tr(2);
        forest.extend( tr(3)-tr(4) );
        assert_eq!( forest, tr(1)-tr(2)-tr(3)-tr(4) );
    }

    #[test]
    fn borrow_forest() {
        let mut tree = tr(0) /tr(1) /tr(2);
        {
            let forest: &Forest<_> = tree.borrow();
            assert_eq!( forest.to_string(), "( 1 2 )" );
        }
        {
            let forest: &mut Forest<_> = tree.borrow_mut();
            for node in forest.iter_mut() {
                node.data *= 10;
            }
        }
        assert_eq!( tree.to_string(), "0( 10 20 )" );
    }
}