use {TextUnit}; use std::str::Chars; pub(crate) struct Ptr<'s> { text: &'s str, len: TextUnit, } impl<'s> Ptr<'s> { pub fn new(text: &'s str) -> Ptr<'s> { Ptr { text, len: TextUnit::new(0) } } pub fn into_len(self) -> TextUnit { self.len } pub fn next(&self) -> Option { self.chars().next() } pub fn nnext(&self) -> Option { let mut chars = self.chars(); chars.next()?; chars.next() } pub fn next_is(&self, c: char) -> bool { self.next() == Some(c) } pub fn nnext_is(&self, c: char) -> bool { self.nnext() == Some(c) } pub fn next_is_p bool>(&self, p: P) -> bool { self.next().map(p) == Some(true) } pub fn nnext_is_p bool>(&self, p: P) -> bool { self.nnext().map(p) == Some(true) } pub fn bump(&mut self) -> Option { let ch = self.chars().next()?; self.len += TextUnit::len_of_char(ch); Some(ch) } pub fn bump_while bool>(&mut self, pred: F) { loop { match self.next() { Some(c) if pred(c) => { self.bump(); }, _ => return, } } } fn chars(&self) -> Chars { let len: u32 = self.len.into(); self.text[len as usize ..].chars() } }