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use crate::err::{ECode, ParseError};
use crate::ptrait::ParseRes;
use std::str::{CharIndices, Chars};
#[derive(Clone, Debug)]
pub struct LCChars<'a> {
iter: CharIndices<'a>,
l: usize,
c: usize,
}
impl<'a> LCChars<'a> {
pub fn str(s: &'a str) -> Self {
LCChars {
iter: s.char_indices(),
l: 0,
c: 0,
}
}
#[deprecated(since = "0.2.1", note = "use from_char_indices instead")]
pub fn from_chars(iter: Chars<'a>) -> LCChars<'a> {
LCChars::str(iter.as_str())
}
pub fn from_char_indices(iter: CharIndices<'a>) -> LCChars<'a> {
LCChars { iter, l: 0, c: 0 }
}
pub fn as_str(&self) -> &'a str {
self.iter.as_str()
}
pub fn err(&self, s: &'static str) -> ParseError {
ParseError::new(s, self.l, self.c)
}
pub fn err_r<V>(&self, s: &'static str) -> Result<V, ParseError> {
Err(self.err(s))
}
pub fn err_c(&self, c: ECode) -> ParseError {
ParseError::code(c, self.l, self.c)
}
pub fn err_cr<V>(&self, c: ECode) -> Result<V, ParseError> {
Err(ParseError::code(c, self.l, self.c))
}
pub fn lc(&self) -> (usize, usize) {
(self.l, self.c)
}
pub fn index(&self) -> Option<usize> {
self.iter.clone().next().map(|(i, _)| i)
}
}
impl<'a> Iterator for LCChars<'a> {
type Item = char;
fn next(&mut self) -> Option<char> {
match self.iter.next() {
Some((_, '\n')) => {
self.l += 1;
self.c = 0;
Some('\n')
}
Some((_, v)) => {
self.c += 1;
Some(v)
}
None => None,
}
}
}
pub fn index<'a>(it: &LCChars<'a>) -> ParseRes<'a, Option<usize>> {
return Ok((it.clone(), it.index()));
}
pub fn line_col<'a>(it: &LCChars<'a>) -> ParseRes<'a, (usize, usize)> {
return Ok((it.clone(), (it.l, it.c)));
}