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use core::{fmt, iter, slice, str::CharIndices};
use crate::Span;
pub trait Input: Clone {
type Item;
type Items: Clone + Iterator<Item = (usize, Self::Item)>;
fn items(&self) -> Self::Items;
fn slice(&self, span: Span) -> Self;
fn len(&self) -> usize;
}
impl<'a> Input for &'a str {
type Item = char;
type Items = CharIndices<'a>;
fn items(&self) -> Self::Items {
self.char_indices()
}
fn slice(&self, span: Span) -> Self {
&self[span]
}
fn len(&self) -> usize {
(*self).len()
}
}
impl<'a> Input for &'a [u8] {
type Item = u8;
type Items = iter::Enumerate<iter::Copied<slice::Iter<'a, u8>>>;
fn items(&self) -> Self::Items {
self.iter().copied().enumerate()
}
fn slice(&self, span: Span) -> Self {
&self[span]
}
fn len(&self) -> usize {
(*self).len()
}
}
pub trait Character {
fn is_alphabetic(&self) -> bool;
fn is_numeric(&self) -> bool;
fn is_whitespace(&self) -> bool;
fn is_alphanumeric(&self) -> bool {
self.is_alphabetic() || self.is_numeric()
}
}
impl Character for char {
fn is_alphabetic(&self) -> bool {
(*self).is_ascii_alphabetic()
}
fn is_numeric(&self) -> bool {
(*self).is_numeric()
}
fn is_whitespace(&self) -> bool {
(*self).is_whitespace()
}
}
#[derive(Clone)]
pub struct InputIter<I: Input> {
pub it: I::Items,
pub input: I,
}
impl<I> InputIter<I>
where
I: Input,
{
pub fn new(input: I) -> Self {
Self {
it: input.items(),
input,
}
}
pub fn position(&self) -> usize {
match self.it.clone().next() {
Some((i, _)) => i,
None => self.input.len(),
}
}
pub fn is_finished(&self) -> bool {
self.clone().next().is_none()
}
pub fn rest(&self) -> I {
self.input.slice(self.position()..self.input.len())
}
}
impl<I> Iterator for InputIter<I>
where
I: Input,
{
type Item = (usize, I::Item);
fn next(&mut self) -> Option<Self::Item> {
self.it.next()
}
}
impl<I> fmt::Debug for InputIter<I>
where
I: Input + fmt::Debug,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:?}", self.rest())
}
}
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