weaver_lang 0.3.5

A dynamic text evaluation language for procedural content generation
Documentation 
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/// Byte-offset range into source text.
///
/// Carried by every AST node so that error messages can point back to
/// the exact piece of source that caused a problem.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Span {
    pub start: usize,
    pub end: usize,
}

impl Span {
    pub fn new(start: usize, end: usize) -> Self {
        Self { start, end }
    }

    /// Merge two spans into one covering both ranges
    pub fn merge(self, other: Span) -> Span {
        Span {
            start: self.start.min(other.start),
            end: self.end.max(other.end),
        }
    }
}

/// Wraps any AST node with its source location.
#[derive(Debug, Clone)]
pub struct Spanned<T> {
    pub node: T,
    pub span: Span,
}

impl<T> Spanned<T> {
    pub fn new(node: T, span: Span) -> Self {
        Self { node, span }
    }

    pub fn map<U>(self, f: impl FnOnce(T) -> U) -> Spanned<U> {
        Spanned {
            node: f(self.node),
            span: self.span,
        }
    }
}