expr_parser/
lib.rs

1use std::{fmt, ops::Range};
2
3pub mod error;
4pub mod evaluate;
5pub mod expression;
6pub mod operator;
7pub mod parser;
8pub mod token;
9
10pub use error::{ParseError, ParseErrorKind, ParseErrors};
11
12#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
13pub struct Span<T> {
14    pub start: T,
15    pub end: T,
16}
17
18impl<T> Span<T> {
19    pub fn new(range: Range<T>) -> Self {
20        Self {
21            start: range.start,
22            end: range.end,
23        }
24    }
25
26    /// Creates a new span encompassing both input spans.
27    pub fn join(self, other: Self) -> Self
28    where
29        T: Ord,
30    {
31        Span {
32            start: self.start.min(other.start),
33            end: self.end.max(other.end),
34        }
35    }
36
37    pub fn into_range(self) -> Range<T> {
38        self.into()
39    }
40
41    pub fn map<U>(self, mut f: impl FnMut(T) -> U) -> Span<U> {
42        Span {
43            start: f(self.start),
44            end: f(self.end),
45        }
46    }
47}
48
49impl<T> From<Span<T>> for Range<T> {
50    fn from(span: Span<T>) -> Self {
51        span.start..span.end
52    }
53}
54
55impl<T> From<Range<T>> for Span<T> {
56    fn from(range: Range<T>) -> Self {
57        Self::new(range)
58    }
59}
60
61impl<T: fmt::Display> fmt::Display for Span<T> {
62    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
63        write!(f, "{}..{}", self.start, self.end)
64    }
65}
expr_parser/lib.rs

expr_parser/
lib.rs
