src/tools/rust-analyzer/crates/syntax/src/utils.rs

   1 //! A set of utils methods to reuse on other abstraction levels
   2
   3 use itertools::Itertools;
   4
   5 use crate::{ast, match_ast, AstNode};
   6
   7 pub fn path_to_string_stripping_turbo_fish(path: &ast::Path) -> String {
   8     path.syntax()
   9         .children()
  10         .filter_map(|node| {
  11             match_ast! {
  12                 match node {
  13                     ast::PathSegment(it) => {
  14                         Some(it.name_ref()?.to_string())
  15                     },
  16                     ast::Path(it) => {
  17                         Some(path_to_string_stripping_turbo_fish(&it))
  18                     },
  19                     _ => None,
  20                 }
  21             }
  22         })
  23         .join("::")
  24 }
  25
  26 #[cfg(test)]
  27 mod tests {
  28     use super::path_to_string_stripping_turbo_fish;
  29     use crate::ast::make;
  30
  31     #[test]
  32     fn turbofishes_are_stripped() {
  33         assert_eq!("Vec", path_to_string_stripping_turbo_fish(&make::path_from_text("Vec::<i32>")),);
  34         assert_eq!(
  35             "Vec::new",
  36             path_to_string_stripping_turbo_fish(&make::path_from_text("Vec::<i32>::new")),
  37         );
  38         assert_eq!(
  39             "Vec::new",
  40             path_to_string_stripping_turbo_fish(&make::path_from_text("Vec::new()")),
  41         );
  42     }
  43 }