lispexp 0.1.1

A pure-Rust reader (lexer + parser) for S-expression syntax across many Lisp dialects
Documentation 
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//! Byte-range source positions.

/// A byte range into the source string: `[start, end)`.
///
/// Positions are stored as byte offsets (ADR-0008); a 1-based line is attached
/// to each [`crate::Datum`] separately, and column is derived on demand.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Span {
    /// Start byte offset (inclusive).
    pub start: u32,
    /// End byte offset (exclusive).
    pub end: u32,
}

impl Span {
    /// Construct a span from a start (inclusive) and end (exclusive) byte offset.
    pub fn new(start: u32, end: u32) -> Self {
        Span { start, end }
    }

    /// The source text this span covers. Zero-copy.
    pub fn text<'a>(&self, source: &'a str) -> &'a str {
        &source[self.start as usize..self.end as usize]
    }
}