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use std::fmt;
pub use codespan::{
ByteIndex as BytePos, ByteOffset, ColumnIndex as Column, ColumnOffset, LineIndex as Line,
LineOffset, Span,
};
#[derive(Copy, Clone, Default, Eq, PartialEq, Debug, Hash, Ord, PartialOrd)]
pub struct Location {
pub line: Line,
pub column: Column,
pub absolute: BytePos,
}
impl Location {
pub fn shift(&mut self, ch: u8) {
if ch == b'\n' {
self.line += LineOffset(1);
self.column = Column(1);
} else {
self.column += ColumnOffset(1);
}
self.absolute += ByteOffset(1);
}
}
impl fmt::Display for Location {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"Line: {}, Column: {}",
self.line.number(),
self.column.number()
)
}
}
#[derive(Copy, Clone, Debug, Eq, PartialEq, Default)]
pub struct Spanned<T, Pos> {
pub span: Span<Pos>,
pub value: T,
}
impl<T, Pos> Spanned<T, Pos> {
pub fn map<U, F>(self, mut f: F) -> Spanned<U, Pos>
where
F: FnMut(T) -> U,
{
Spanned {
span: self.span,
value: f(self.value),
}
}
}
impl<T: fmt::Display, Pos: fmt::Display + Copy> fmt::Display for Spanned<T, Pos> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}: {}", self.span.start(), self.value)
}
}
pub fn span<Pos>(start: Pos, end: Pos) -> Span<Pos>
where
Pos: Ord,
{
Span::new(start, end)
}
pub fn spanned<T, Pos>(span: Span<Pos>, value: T) -> Spanned<T, Pos>
where
Pos: Ord,
{
Spanned { span, value }
}
pub fn spanned2<T, Pos>(start: Pos, end: Pos, value: T) -> Spanned<T, Pos>
where
Pos: Ord,
{
Spanned {
span: span(start, end),
value,
}
}
pub trait HasSpan {
fn span(&self) -> Span<BytePos>;
}