39 lines
736 B
Rust
39 lines
736 B
Rust
|
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<char> {
|
||
|
|
self.chars().next()
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn nnext(&self) -> Option<char> {
|
||
|
|
let mut chars = self.chars();
|
||
|
|
chars.next()?;
|
||
|
|
chars.next()
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn bump(&mut self) -> Option<char> {
|
||
|
|
let ch = self.chars().next()?;
|
||
|
|
self.len += TextUnit::len_of_char(ch);
|
||
|
|
Some(ch)
|
||
|
|
}
|
||
|
|
|
||
|
|
fn chars(&self) -> Chars {
|
||
|
|
self.text[self.len.0 as usize ..].chars()
|
||
|
|
}
|
||
|
|
}
|