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use std::ffi::OsStr;
const DEFAULT_CAPACITY: usize = 392;
#[derive(Debug, PartialEq)]
pub struct StringBuilder {
chars: Vec<char>
}
impl StringBuilder {
pub fn new() -> StringBuilder {
StringBuilder::with_capacity(DEFAULT_CAPACITY)
}
pub fn with_capacity(size: usize) -> StringBuilder {
StringBuilder {
chars: Vec::with_capacity(size),
}
}
pub fn append<T: Vcharsable>(&mut self, buff: T) -> &mut StringBuilder {
self.chars.append(buff.vechars().as_mut());
self
}
pub fn len(&self) -> usize {
self.chars.len()
}
pub fn delete_at(&mut self, start: usize) -> &mut StringBuilder {
self.delete(start, start + 1)
}
pub fn delete(&mut self, start: usize, end: usize) -> &mut StringBuilder {
if end == 0 {
panic!("end index must be greater then 0. end: {}", end);
}
if end <= start {
panic!("End index must be greater than start. start: {} end: {}", start, end);
}
if end > self.chars.len() {
panic!("Out of index range. end: {}", end);
}
for _i in start..end {
self.chars.remove(start);
}
self
}
pub fn clear(&mut self) -> &mut StringBuilder {
self.chars.clear();
self
}
pub fn string(&self) -> String {
self.chars.clone().into_iter().collect()
}
}
impl ToString for StringBuilder {
fn to_string(&self) -> String {
self.string()
}
}
pub trait Vcharsable {
fn vechars(&self) -> Vec<char>;
}
impl Vcharsable for String {
fn vechars(&self) -> Vec<char> {
self.chars().collect()
}
}
impl Vcharsable for OsStr {
fn vechars(&self) -> Vec<char> {
self.to_str().unwrap().chars().collect()
}
}
impl<'a> Vcharsable for &'a str {
fn vechars(&self) -> Vec<char> {
self.chars().collect()
}
}
impl Vcharsable for char {
fn vechars(&self) -> Vec<char> {
let mut vec = Vec::with_capacity(1);
vec.push(*self);
vec
}
}