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use std::iter::FromIterator; #[derive(Clone, Default)] pub struct Buffer { pub buffer: Vec<char>, pub buffer_pos: usize, } impl Buffer { pub fn new() -> Self { Self { ..Self::default() } } pub fn insert(&mut self, c: char) { self.buffer.insert(self.buffer_pos, c); self.move_forward(); } pub fn insert_str(&mut self, s: &str) { s.chars().for_each(|c| self.insert(c)); } pub fn set_buffer_pos(&mut self, pos: usize) { self.buffer_pos = pos; } pub fn remove_current_char(&mut self) -> Option<char> { if !self.is_empty() && self.buffer_pos < self.buffer.len() { let character = self.buffer.remove(self.buffer_pos); Some(character) } else { None } } pub fn next_char(&self) -> Option<&char> { self.buffer.get(self.buffer_pos + 1) } pub fn current_char(&self) -> Option<&char> { self.buffer.get(self.buffer_pos) } pub fn previous_char(&self) -> Option<&char> { if self.buffer_pos > 0 { self.buffer.get(self.buffer_pos - 1) } else { None } } pub fn move_forward(&mut self) { self.buffer_pos += 1; } pub fn move_backward(&mut self) { if self.buffer_pos != 0 { self.buffer_pos -= 1; } } pub fn clear(&mut self) { self.buffer.clear(); self.buffer_pos = 0; } pub fn len(&self) -> usize { self.buffer.len() } pub fn is_empty(&self) -> bool { self.len() == 0 } pub fn is_at_string_line_start(&self) -> bool { self.is_empty() || self.buffer[..self.buffer_pos] .rsplitn(2, |d| d == &'\n') .next() .unwrap_or_default() .iter() .all(|c| c.is_whitespace()) } pub fn is_at_start(&self) -> bool { self.buffer_pos == 0 } pub fn is_at_end(&self) -> bool { self.buffer_pos == self.buffer.len() } pub fn goto_start(&mut self) { self.buffer_pos = 0; } pub fn goto_end(&mut self) { self.buffer_pos = self.buffer.len(); } pub fn _push_str(&mut self, str: &str) { self.buffer.extend(str.chars()); self.buffer_pos = self.buffer.len(); } pub fn get(&self, idx: usize) -> Option<&char> { self.buffer.get(idx) } pub fn _last(&self) -> Option<&char> { self.buffer.last() } pub fn iter(&self) -> impl Iterator<Item = &char> { self.buffer.iter() } pub fn take(&mut self) -> Vec<char> { let buffer = std::mem::take(&mut self.buffer); self.clear(); self.goto_start(); buffer } } impl ToString for Buffer { fn to_string(&self) -> String { self.buffer.iter().collect() } } impl From<&str> for Buffer { fn from(string: &str) -> Self { Self { buffer: string.chars().collect(), buffer_pos: 0, } } } impl From<String> for Buffer { fn from(string: String) -> Self { Self { buffer: string.chars().collect(), buffer_pos: 0, } } } impl From<Vec<char>> for Buffer { fn from(buffer: Vec<char>) -> Self { Self { buffer, buffer_pos: 0, } } } impl FromIterator<char> for Buffer { fn from_iter<I: IntoIterator<Item = char>>(iter: I) -> Buffer { let mut buffer = Buffer::new(); for c in iter { buffer.buffer.push(c); } buffer } }