95 lines
2.6 KiB
Rust
95 lines
2.6 KiB
Rust
use std::{fmt::Display, sync::Arc};
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/// Represents a position in source text.
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#[derive(Clone, Default, Debug)]
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#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
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#[cfg_attr(
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any(test, feature = "serde"),
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derive(PartialEq, Eq, serde::Serialize, serde::Deserialize)
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)]
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pub struct SourcePosition {
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/// The 0-based index of the character in the input stream.
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pub index: usize,
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/// The 1-based line number.
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pub line: usize,
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/// The 1-based column number.
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pub column: usize,
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}
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impl Display for SourcePosition {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.write_fmt(format_args!("{},{}", self.line, self.column))
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}
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}
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impl SourcePosition {
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/// Returns a new `SourcePosition` offset by the given `SourcePositionOffset`.
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///
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/// # Arguments
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///
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/// * `offset` - The offset to apply.
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#[must_use]
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pub const fn offset(&self, offset: &SourcePositionOffset) -> Self {
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Self {
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index: self.index + offset.index,
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line: self.line + offset.line,
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column: if offset.line == 0 {
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self.column + offset.column
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} else {
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offset.column + 1
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},
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}
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}
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}
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#[cfg(feature = "diagnostics")]
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impl From<&SourcePosition> for miette::SourceOffset {
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#[allow(clippy::cast_sign_loss)]
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fn from(position: &SourcePosition) -> Self {
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position.index.into()
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}
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}
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/// Represents an offset in source text.
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#[derive(Clone, Default, Debug)]
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#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
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#[cfg_attr(
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any(test, feature = "serde"),
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derive(PartialEq, Eq, serde::Serialize, serde::Deserialize)
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)]
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pub struct SourcePositionOffset {
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/// The 0-based character offset.
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pub index: usize,
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/// The 0-based line offset.
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pub line: usize,
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/// The 0-based column offset.
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pub column: usize,
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}
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/// Represents a span within source text.
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#[derive(Clone, Default, Debug)]
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#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
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#[cfg_attr(
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any(test, feature = "serde"),
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derive(PartialEq, Eq, serde::Serialize, serde::Deserialize)
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)]
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pub struct SourceSpan {
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/// The start position.
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pub start: Arc<SourcePosition>,
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/// The end position of the span (exclusive).
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pub end: Arc<SourcePosition>,
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}
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impl SourceSpan {
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/// Returns the length of the token in characters.
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pub fn length(&self) -> usize {
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self.end.index - self.start.index
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}
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pub(crate) fn within(start: &Self, end: &Self) -> Self {
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Self {
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start: start.start.clone(),
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end: end.end.clone(),
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}
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}
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}
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