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use std::fmt;
#[derive(Clone, Copy, Default, Debug, PartialEq, Eq)]
pub struct Pos {
pub idx: u32,
pub line: u32,
pub col: u32,
}
impl std::cmp::PartialOrd for Pos {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
Some(self.cmp(other))
}
}
impl std::cmp::Ord for Pos {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
self.idx.cmp(&other.idx)
}
}
impl Pos {
pub const fn new() -> Self {
Self {
idx: 0,
line: 1,
col: 1,
}
}
#[must_use]
pub fn advance(self, c: char) -> Self {
let idx = self.idx + u32::try_from(c.len_utf8()).unwrap_or_default();
if c == '\n' {
Self {
idx,
line: self.line + 1,
col: 1,
}
} else {
Self {
idx,
line: self.line,
col: self.col + 1,
}
}
}
}
impl fmt::Display for Pos {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}:{}", self.line, self.col)
}
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct Span {
pub start: Pos,
pub end: Pos,
}
impl Span {
pub const fn new(start: Pos, end: Pos) -> Self {
if end.idx < start.idx {
Self {
start: end,
end: start,
}
} else {
Self { start, end }
}
}
pub fn of<'a>(&self, s: &'a str) -> &'a str {
&s[(self.start.idx as usize)..(self.end.idx as usize)]
}
}
impl fmt::Display for Span {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}-{}", self.start, self.end)
}
}
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