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submod_path_from_attr: simplify & document

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This commit is contained in:
Mazdak Farrokhzad 2020-03-07 18:59:44 +01:00
parent f509b26a77
commit bc75cba23f
1 changed files with 13 additions and 12 deletions
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15
src/librustc_parse/parser/module.rs
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@ -179,21 +179,22 @@ impl<'a> Parser<'a> {
}
}
/// Derive a submodule path from the first found `#[path = "path_string"]`.
/// The provided `dir_path` is joined with the `path_string`.
// Public for rustfmt usage.
pub fn submod_path_from_attr(attrs: &[Attribute], dir_path: &Path) -> Option<PathBuf> {
if let Some(s) = attr::first_attr_value_str_by_name(attrs, sym::path) {
let s = s.as_str();
// Extract path string from first `#[path = "path_string"]` attribute.
let path_string = attr::first_attr_value_str_by_name(attrs, sym::path)?;
let path_string = path_string.as_str();
// On windows, the base path might have the form
// `\\?\foo\bar` in which case it does not tolerate
// mixed `/` and `\` separators, so canonicalize
// `/` to `\`.
#[cfg(windows)]
let s = s.replace("/", "\\");
Some(dir_path.join(&*s))
} else {
None
}
let path_string = path_string.replace("/", "\\");
Some(dir_path.join(&*path_string))
}
/// Returns a path to a module.