forked from extern/nushell
85 lines
2.2 KiB
Rust
85 lines
2.2 KiB
Rust
use miette::SourceSpan;
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use serde::{Deserialize, Serialize};
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/// A spanned area of interest, generic over what kind of thing is of interest
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#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
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pub struct Spanned<T>
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where
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T: Clone + std::fmt::Debug,
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{
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pub item: T,
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pub span: Span,
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}
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/// Spans are a global offset across all seen files, which are cached in the engine's state. The start and
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/// end offset together make the inclusive start/exclusive end pair for where to underline to highlight
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/// a given point of interest.
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#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
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pub struct Span {
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pub start: usize,
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pub end: usize,
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}
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impl From<Span> for SourceSpan {
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fn from(s: Span) -> Self {
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Self::new(s.start.into(), (s.end - s.start).into())
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}
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}
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impl Span {
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pub fn new(start: usize, end: usize) -> Span {
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Span { start, end }
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}
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pub fn unknown() -> Self {
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Self::new(0, 0)
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}
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/// Note: Only use this for test data, *not* live data, as it will point into unknown source
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/// when used in errors.
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pub fn test_data() -> Span {
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Span { start: 0, end: 0 }
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}
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pub fn offset(&self, offset: usize) -> Span {
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Span {
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start: self.start - offset,
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end: self.end - offset,
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}
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}
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pub fn contains(&self, pos: usize) -> bool {
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pos >= self.start && pos < self.end
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}
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pub fn contains_span(&self, span: Span) -> bool {
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span.start >= self.start && span.end <= self.end
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}
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/// Point to the space just past this span, useful for missing
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/// values
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pub fn past(&self) -> Span {
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Span {
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start: self.end,
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end: self.end,
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}
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}
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}
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/// Used when you have a slice of spans of at least size 1
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pub fn span(spans: &[Span]) -> Span {
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let length = spans.len();
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if length == 0 {
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// TODO: do this for now, but we might also want to protect against this case
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Span { start: 0, end: 0 }
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} else if length == 1 {
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spans[0]
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} else {
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Span {
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start: spans[0].start,
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end: spans[length - 1].end,
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}
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}
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}
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