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|
extern crate swc_common;
use micromark::{
mdast::Stop,
unist::{Point, Position},
Location,
};
use swc_common::{BytePos, Span, SyntaxContext, DUMMY_SP};
use swc_ecma_visit::{noop_visit_mut_type, VisitMut};
/// Turn a unist position, into an SWC span, of two byte positions.
///
/// > 👉 **Note**: SWC byte positions are offset by one: they are `0` when they
/// > are missing or incremented by `1` when valid.
pub fn position_to_span(position: Option<&Position>) -> Span {
position.map_or(DUMMY_SP, |d| Span {
lo: point_to_bytepos(&d.start),
hi: point_to_bytepos(&d.end),
ctxt: SyntaxContext::empty(),
})
}
/// Turn an SWC span, of two byte positions, into a unist position.
///
/// This assumes the span comes from a fixed tree, or is a dummy.
///
/// > 👉 **Note**: SWC byte positions are offset by one: they are `0` when they
/// > are missing or incremented by `1` when valid.
pub fn span_to_position(span: &Span, location: Option<&Location>) -> Option<Position> {
let lo = span.lo.0 as usize;
let hi = span.hi.0 as usize;
if lo > 0 && hi > 0 {
if let Some(location) = location {
if let Some(start) = location.to_point(lo - 1) {
if let Some(end) = location.to_point(hi - 1) {
return Some(Position { start, end });
}
}
}
}
None
}
/// Turn a unist point into an SWC byte position.
///
/// > 👉 **Note**: SWC byte positions are offset by one: they are `0` when they
/// > are missing or incremented by `1` when valid.
pub fn point_to_bytepos(point: &Point) -> BytePos {
BytePos(point.offset as u32 + 1)
}
/// Turn an SWC byte position into a unist point.
///
/// This assumes the byte position comes from a fixed tree, or is a dummy.
///
/// > 👉 **Note**: SWC byte positions are offset by one: they are `0` when they
/// > are missing or incremented by `1` when valid.
pub fn bytepos_to_point(bytepos: &BytePos, location: Option<&Location>) -> Option<Point> {
let pos = bytepos.0 as usize;
if pos > 0 {
if let Some(location) = location {
return location.to_point(pos - 1);
}
}
None
}
/// Prefix an error message with an optional point.
pub fn prefix_error_with_point(reason: String, point: Option<&Point>) -> String {
if let Some(point) = point {
format!("{}: {}", point_to_string(point), reason)
} else {
reason
}
}
/// Serialize a unist position for humans.
pub fn position_to_string(position: &Position) -> String {
format!(
"{}-{}",
point_to_string(&position.start),
point_to_string(&position.end)
)
}
/// Serialize a unist point for humans.
pub fn point_to_string(point: &Point) -> String {
format!("{}:{}", point.line, point.column)
}
/// Visitor to fix SWC byte positions.
///
/// This assumes the byte position comes from an **unfixed** tree.
///
/// > 👉 **Note**: SWC byte positions are offset by one: they are `0` when they
/// > are missing or incremented by `1` when valid.
#[derive(Debug, Default, Clone)]
pub struct RewriteContext<'a> {
pub prefix_len: usize,
pub stops: &'a [Stop],
pub location: Option<&'a Location>,
}
impl<'a> VisitMut for RewriteContext<'a> {
noop_visit_mut_type!();
// Rewrite spans.
fn visit_mut_span(&mut self, span: &mut Span) {
let mut result = DUMMY_SP;
let lo_rel = span.lo.0 as usize;
let hi_rel = span.hi.0 as usize;
if lo_rel > self.prefix_len && hi_rel > self.prefix_len {
if let Some(lo_abs) =
Location::relative_to_absolute(self.stops, lo_rel - 1 - self.prefix_len)
{
if let Some(hi_abs) =
Location::relative_to_absolute(self.stops, hi_rel - 1 - self.prefix_len)
{
result = Span {
lo: BytePos(lo_abs as u32 + 1),
hi: BytePos(hi_abs as u32 + 1),
ctxt: SyntaxContext::empty(),
};
}
}
}
*span = result;
}
}
|
