Witch of Git - ess/blob - src/span.rs

   1 //! A `Span` represents a location in source file.
   2
   3 pub trait Span {
   4     type Begin;
   5
   6     fn offset(&self, begin: Self::Begin) -> Self;
   7     fn begin(&self) -> Self::Begin;
   8     fn union(&self, other: &Self) -> Self;
   9 }
  10
  11 pub type ByteSpan = (usize, usize);
  12
  13 impl Span for ByteSpan {
  14     type Begin = usize;
  15
  16     fn offset(&self, begin: Self::Begin) -> Self {
  17         (self.0 + begin, self.1 + begin)
  18     }
  19
  20     fn begin(&self) -> Self::Begin {
  21         self.0
  22     }
  23
  24     fn union(&self, other: &Self) -> Self {
  25         use std::cmp::{min, max};
  26         (min(self.0, other.0), max(self.1, other.1))
  27     }
  28 }
  29