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use crate::red_black_tree::RedBlackTree;
use crate::avl_tree::AVLTree;
use std::str::FromStr;
use std::io::{stdin, stdout, Write};
pub struct CommandLineInterface{}
impl CommandLineInterface{
pub fn run(&self){
let mut intro = 1;
// used to test the library
loop {
if intro == 1 {
// ask user to test a tree type
println!("\n\nType \"rbt\" or \"avl\" to select the type of tree to test.");
println!("Type help at any time for a list of available commands.\n");
intro = 0;
}
// print the users cursor
print!("Select Tree > ");
stdout().flush().unwrap();
// get the users input
let mut input = String::new();
let line = stdin().read_line(&mut input);
match line{
Ok(val) => {
if val < 3{ // if input is null
continue;
}
}
_ => {},
}
let mut parts = input.trim().split_whitespace();
let command = parts.next().unwrap();
// match the command to an action
match command {
"exit" => return,
"rbt" => {
self.run_rbt();
},
"avl" => {
self.run_avl();
},
"help" => {
println!("\nAvailable commands:\n");
println!(" exit - Exit the program.");
println!(" rbt - Test the red black tree library.");
println!(" avl - Test the avl tree library.");
println!(" help - Show available commands.");
println!();
},
command => {
println!("Command {:?} not recognized. Type help for available commands.", command);
}
}
}
}
fn run_rbt(&self) {
let mut rbtree = RedBlackTree::<f64>::new();
loop {
// print the users cursor
print!("Testing RBT > ");
stdout().flush().unwrap();
// get the users input
let mut input = String::new();
let line = stdin().read_line(&mut input);
match line{
Ok(val) => {
if val < 3{ // if input is null
continue;
}
}
_ => {},
}
let mut parts = input.trim().split_whitespace();
let command = parts.next().unwrap();
let args = parts;
// match the command to an action
match command {
"exit" => return,
"help" => {
println!("\nAvailable commands:\n");
println!(" exit - Exit the program. (will delete the current rbt)");
println!(" help - Shows available commands.");
println!(" insert VAL - Inserts \"VAL\" into the tree.");
println!(" delete VAL - Deletes \"VAL\" from the tree.");
println!(" count - Returns the number of leaves in the tree.");
println!(" height - Returns the height of the tree.");
println!(" print - Prints out the node information in order.");
println!(" isempty - Returns 0 if the tree is empty, otherwise 1.");
println!();
},
"insert" => {
match args.peekable().peek() {
Some(val) => {
let float:Result<f64, _> = FromStr::from_str(val);
match float{
Ok(_) => {},
_=> {
println!("Invalid data type. Please try again.");
continue;
},
}
rbtree.insert(FromStr::from_str(val).unwrap());
},
None => {
println!("Must add a value after \"insert\"");
}
}
},
"delete" => {
match args.peekable().peek() {
Some(val) => {
let float:Result<f64, _> = FromStr::from_str(val);
match float{
Ok(_) => {},
_=> {
println!("Invalid data type. Please try again.");
continue;
},
}
rbtree.delete(FromStr::from_str(val).unwrap());
},
None => {
println!("Must add a value after \"delete\"");
}
}
},
"count" => {
println!("{:?}", rbtree.count_leaf_nodes());
},
"height" => {
println!("{:?}", rbtree.get_height());
},
"print" => {
rbtree.print_in_order_traversal();
},
"isempty" => {
println!("{:?}", rbtree.is_empty());
},
command => {
println!("Command {:?} not recognized. Type help for available commands.", command);
}
}
}
}
fn run_avl(&self) {
let mut avltree = AVLTree::<f64>::new();
loop {
// print the users cursor
print!("Testing AVL > ");
stdout().flush().unwrap();
// get the users input
let mut input = String::new();
let line = stdin().read_line(&mut input);
match line{
Ok(val) => {
if val < 3{ // if input is null
continue;
}
}
_ => {},
}
let mut parts = input.trim().split_whitespace();
let command = parts.next().unwrap();
let args = parts;
// match the command to an action
match command {
"exit" => return,
"help" => {
println!("\nAvailable commands:\n");
println!(" exit - Exit the program. (will delete the current avl tree)");
println!(" help - Shows available commands.");
println!(" insert VAL - Inserts \"VAL\" into the tree.");
println!(" delete VAL - Deletes \"VAL\" from the tree.");
println!(" count - Returns the number of leaves in the tree.");
println!(" height - Returns the height of the tree.");
println!(" print - Prints out the node information in order.");
println!(" isempty - Returns 0 if the tree is empty, otherwise 1.");
println!();
},
"insert" => {
match args.peekable().peek() {
Some(val) => {
let float:Result<f64, _> = FromStr::from_str(val);
match float{
Ok(_) => {},
_=> {
println!("Invalid data type. Please try again.");
continue;
},
}
avltree.insert(FromStr::from_str(val).unwrap());
},
None => {
println!("Must add a value after \"insert\"");
}
}
},
"delete" => {
match args.peekable().peek() {
Some(val) => {
let float:Result<f64, _> = FromStr::from_str(val);
match float{
Ok(_) => {},
_=> {
println!("Invalid data type. Please try again.");
continue;
},
}
avltree.delete(FromStr::from_str(val).unwrap());
},
None => {
println!("Must add a value after \"delete\"");
}
}
},
"count" => {
println!("{:?}", avltree.count_leaf_nodes());
},
"height" => {
println!("{:?}", avltree.get_height());
},
"print" => {
avltree.print_in_order_traversal();
},
"isempty" => {
println!("{:?}", avltree.is_empty());
},
command => {
println!("Command {:?} not recognized. Type help for available commands.", command);
},
}
}
}
}