bon_macros/util/
path.rs

1use crate::util::prelude::*;
2
3pub(crate) trait PathExt {
4    fn starts_with_segment(&self, desired_segment: &str) -> bool;
5    fn ends_with_segment(&self, desired_segment: &str) -> bool;
6
7    /// Returns an error if this path has some generic arguments.
8    fn require_mod_style(&self) -> Result;
9}
10
11impl PathExt for syn::Path {
12    fn starts_with_segment(&self, desired_segment: &str) -> bool {
13        self.segments
14            .first()
15            .map(|first| first.ident == desired_segment)
16            .unwrap_or(false)
17    }
18
19    fn ends_with_segment(&self, desired_segment: &str) -> bool {
20        self.segments
21            .last()
22            .map(|first| first.ident == desired_segment)
23            .unwrap_or(false)
24    }
25
26    fn require_mod_style(&self) -> Result {
27        if self
28            .segments
29            .iter()
30            .any(|seg| seg.arguments != syn::PathArguments::None)
31        {
32            bail!(self, "expected a simple path e.g. `foo::bar`");
33        }
34
35        Ok(())
36    }
37}
bon_macros/util/path.rs

bon_macros/util/
path.rs
