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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 } }