commit 2188ade9c73ce38936617ab22536dc3941be1d3f
Author: Walter Oggioni <oggioni.walter@gmail.com>
Date:   Sat Dec 28 16:50:04 2019 +0100

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..53eaa21
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+**/*.rs.bk
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..e969c28
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "levtree"
+version = "0.1.0"
+authors = ["Walter Oggioni <oggioni.walter@gmail.com>"]
+
+[dependencies]
+
+[[bin]]
+name = "linked_list"
+path = "src/linked_list.rs"
+
+[[bin]]
+name = "levtree"
+#path = "src/test.rs"
+path = "src/main.rs"
diff --git a/src/levtree.rs b/src/levtree.rs
new file mode 100644
index 0000000..4b20979
--- /dev/null
+++ b/src/levtree.rs
@@ -0,0 +1,145 @@
+use std::collections::HashMap;
+
+struct Node {
+	key: char,
+	row: Vec<u32>,
+	prev: usize,
+	next: usize,
+	child: usize,
+	parent: usize,
+	processed: bool
+}
+
+impl Node {
+	fn new(key: char) -> Node {
+		Node {
+			key,
+			row: Vec::new(),
+			prev: 0,
+			next: 0,
+			child: 0,
+			parent: 0,
+			processed: false,
+		}
+	}
+}
+
+pub struct Result {
+	word: std::rc::Rc<String>,
+	distance: usize,
+}
+
+impl PartialOrd for Result {
+	fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+		Some(self.distance.cmp(&other.distance))
+	}
+}
+
+impl PartialEq for Result {
+	fn eq(&self, other: &Self) -> bool {
+		self.distance == other.distance
+	}
+}
+
+impl Eq for Result {}
+
+impl Ord for Result {
+	fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+		self.distance.cmp(&other.distance)
+	}
+}
+//struct Standing {
+//	size: usize,
+//	results: Vec<Result>,
+//}
+//
+//impl Standing {
+//	pub fn new(size: usize) -> Standing {
+//		Standing {
+//			size,
+//			results: BTreeSet::new(),
+//		}
+//	}
+//
+//	pub fn addResult(&mut self, res: Result) {
+//		self.results.push(res)
+//	}
+//}
+
+pub struct Tree {
+	maxsize: usize,
+	allocated: bool,
+	torealloc: bool,
+	nodes : Vec<Node>, 
+	checker: fn(c1: char, c2: char) -> bool,
+	distance_calculator: fn() -> usize,
+	words : HashMap<usize, String>
+}
+	
+impl Tree {
+	pub fn new(words: Vec<String>) -> Tree {
+		let mut result = Tree {
+			maxsize: words.len(),
+			allocated: false,
+			torealloc: false,
+			nodes : vec!(Node::new('\0')),
+			checker: |c1: char, c2: char| c1 == c2,
+			distance_calculator: || -> usize { 0 },
+			words : HashMap::new()
+		};
+		result.build_tree(words);
+		result
+	}
+	
+	fn root(&mut self) -> &mut Node {
+		&mut self.nodes[0]
+	}
+	
+	fn add_child(&mut self, parent_index : usize, key : char) -> usize {
+		let mut new_child = Node::new(key);
+		new_child.parent = parent_index;
+		let mut child = self.nodes[parent_index].child;
+		let mut prev = child;
+		while child != 0 {
+			prev = child;
+			child = self.nodes[child].next
+		}
+		new_child.prev = prev;
+		self.nodes.push(new_child);
+		let new_child_index = self.nodes.len();
+		if prev != 0 {
+			self.nodes[prev].next = new_child_index;
+		}
+		if self.nodes[parent_index].child == 0 {
+			self.nodes[parent_index].child = new_child_index
+		}
+		self.nodes.len() - 1
+	}
+	
+	fn build_tree(&mut self, words : Vec<String>) {
+		for word in words {
+			let mut nindex = 0;
+			for c in word.chars() {
+				if self.nodes[nindex].child == 0 {
+					nindex = self.add_child(nindex, c);
+				} else {
+					nindex = self.nodes[nindex].child;
+					loop {
+						if self.nodes[nindex].key == c {
+							break
+						} else {
+							if self.nodes[nindex].next == 0 {
+									nindex = self.add_child(nindex, c);
+									break								
+							} else {
+								nindex = self.nodes[nindex].next;
+							}
+						}
+					}					
+				}
+			}
+			let leaf = self.add_child(nindex, '\0');
+			self.words.insert(leaf, word);
+		}
+	}
+}
diff --git a/src/linked_list.rs b/src/linked_list.rs
new file mode 100644
index 0000000..5803494
--- /dev/null
+++ b/src/linked_list.rs
@@ -0,0 +1,153 @@
+use std::mem;
+use std::ptr;
+
+pub struct List<T> {
+    list_head: Option<Box<Node<T>>>,
+    list_tail: Rawlink<Node<T>>,
+}
+
+struct Rawlink<T> { p: *mut T }
+
+impl<T> Copy for Rawlink<T> {}
+
+impl<T> Clone for Rawlink<T> {
+    fn clone(&self) -> Self { Rawlink { p: self.p } }
+}
+
+pub struct Node<T> {
+    next: Option<Box<Node<T>>>,
+    prev: Rawlink<Node<T>>,
+    value: T,
+}
+
+impl<T> List<T> {
+    pub fn is_empty(&self) -> bool {
+        self.list_head.is_none()
+    }
+
+    pub fn len(&self) -> usize {
+        let mut node = &self.list_head;
+        let mut i = 0;
+        loop {
+            match *node {
+                Some(ref n) => {
+                    i+=1;
+                    node=&n.next;
+                }
+                None => {
+                    return i;
+                }
+            }
+        }
+    }
+    
+    /// Create an empty DList
+    pub fn new() -> List<T> {
+        List{list_head: None, list_tail: Rawlink::none()}
+    }
+
+    pub fn push_front(&mut self, elt: T) {
+        self.push_front_node(Box::new(Node::new(elt)))
+    }
+
+    pub fn push_front_node(&mut self, mut new_head: Box<Node<T>>) {
+        match self.list_head {
+            None => {
+                self.list_tail = Rawlink::some(&mut new_head);
+                new_head.prev = Rawlink::none();
+                self.list_head = Some(new_head);
+            }
+            Some(ref mut head) => {
+                new_head.prev = Rawlink::none();
+                head.prev = Rawlink::some(&mut new_head);
+                mem::swap(head, &mut new_head);
+                head.next = Some(new_head);
+            }
+        }
+    }
+
+    /// Provide a forward iterator
+    #[inline]
+    pub fn iter<'a>(&'a self) -> ListIterator<'a, T> {
+        ListIterator{nelem: self.len(), head: &self.list_head, tail: self.list_tail}
+    }
+}
+
+impl<T> Node<T> {
+    fn new(v: T) -> Node<T> {
+        Node{value: v, next: None, prev: Rawlink::none()}
+    }
+}
+
+/// Rawlink is a type like Option<T> but for holding a raw pointer
+impl<T> Rawlink<T> {
+    /// Like Option::None for Rawlink
+    fn none() -> Rawlink<T> {
+        Rawlink{p: ptr::null_mut()}
+    }
+
+    /// Like Option::Some for Rawlink
+    fn some(n: &mut T) -> Rawlink<T> {
+        Rawlink{p: n as *mut T}
+    }
+
+    /// Convert the `Rawlink` into an Option value
+    fn resolve_immut<'a>(&self) -> Option<&'a T> {
+        unsafe { self.p.as_ref() }
+    }
+
+    /// Convert the `Rawlink` into an Option value
+    fn resolve<'a>(&mut self) -> Option<&'a mut T> {
+        unsafe { self.p.as_mut() }
+    }
+
+    /// Return the `Rawlink` and replace with `Rawlink::none()`
+    fn take(&mut self) -> Rawlink<T> {
+        mem::replace(self, Rawlink::none())
+    }
+}
+
+pub struct ListIterator<'a, T: 'a> {
+    head: &'a Option<Box<Node<T>>>,
+    tail: Rawlink<Node<T>>,
+    nelem: usize,
+}
+
+impl<'a, A> Iterator for ListIterator<'a, A> {
+    type Item = &'a A;
+    
+    #[inline]
+    fn next(&mut self) -> Option<&'a A> {
+        if self.nelem == 0 {
+            return None;
+        }
+        self.head.as_ref().map(|head| {
+            self.nelem -= 1;
+            self.head = &head.next;
+            &head.value
+        })
+    }
+
+    #[inline]
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        (self.nelem, Some(self.nelem))
+    }
+}
+
+impl<'a, A> DoubleEndedIterator for ListIterator<'a, A> {
+    #[inline]
+    fn next_back(&mut self) -> Option<&'a A> {
+        if self.nelem == 0 {
+            return None;
+        }
+        let tmp = self.tail.resolve_immut();
+        tmp.as_ref().map(|prev| {
+            self.nelem -= 1;
+            self.tail = prev.prev;
+            &prev.value
+        })
+    }
+}
+
+fn main() {
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..b52b8c7
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,20 @@
+mod levtree;
+
+use std::fs::File;
+//use std::io::prelude::*;
+use std::io::BufReader;
+use std::io::BufRead;
+
+fn main() {
+	//let mut words : Vec<String> = Vec::new();
+	//let infile : File = try!(File::open("/usr/share/dict/cracklib-small"));
+	let filename = "/usr/share/dict/cracklib-small";
+	let infile : File = File::open(filename).expect(
+		&format!("Error opening {}:", &filename)
+	);
+    let reader = BufReader::new(infile);
+	let tree = levtree::Tree::new(
+		reader.lines()
+			.map(|line| line.unwrap())
+			.collect());
+}
diff --git a/src/test.rs b/src/test.rs
new file mode 100644
index 0000000..fa4ab23
--- /dev/null
+++ b/src/test.rs
@@ -0,0 +1,6 @@
+
+
+fn main(){
+	let mut ints = vec!(1,2,3,4,5,6);
+	ints[4] = 2;
+}
\ No newline at end of file