rune/ast/
expr_range.rs

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1use crate::ast::prelude::*;
2
3#[test]
4#[cfg(not(miri))]
5fn ast_parse() {
6    rt::<ast::ExprRange>("0..42");
7    rt::<ast::ExprRange>("0..=42");
8    rt::<ast::ExprRange>("0..=a + 2");
9}
10
11/// A range expression.
12///
13/// * `a .. b` or `a ..= b`.
14#[derive(Debug, TryClone, PartialEq, Eq, ToTokens, Spanned)]
15#[non_exhaustive]
16pub struct ExprRange {
17    /// Attributes associated with the assign expression.
18    #[rune(iter)]
19    pub attributes: Vec<ast::Attribute>,
20    /// Start of range.
21    #[rune(iter)]
22    pub start: Option<Box<ast::Expr>>,
23    /// The range limits.
24    pub limits: ExprRangeLimits,
25    /// End of range.
26    #[rune(iter)]
27    pub end: Option<Box<ast::Expr>>,
28}
29
30/// The limits of the specified range.
31#[derive(Debug, TryClone, PartialEq, Eq, ToTokens, Spanned)]
32#[non_exhaustive]
33pub enum ExprRangeLimits {
34    /// Half-open range expression.
35    HalfOpen(T![..]),
36    /// Closed expression.
37    Closed(T![..=]),
38}
39
40impl Parse for ExprRangeLimits {
41    fn parse(p: &mut Parser<'_>) -> Result<Self> {
42        Ok(match p.nth(0)? {
43            K![..] => Self::HalfOpen(p.parse()?),
44            K![..=] => Self::Closed(p.parse()?),
45            _ => return Err(compile::Error::expected(p.tok_at(0)?, "range limits")),
46        })
47    }
48}
49
50expr_parse!(Range, ExprRange, "range expression");
rune/ast/expr_range.rs

rune/ast/
expr_range.rs
