src/librustc_lint/non_ascii_idents.rs

   1 use crate::{EarlyContext, EarlyLintPass, LintContext};
   2 use syntax::ast;
   3
   4 declare_lint! {
   5     pub NON_ASCII_IDENTS,
   6     Allow,
   7     "detects non-ASCII identifiers"
   8 }
   9
  10 declare_lint! {
  11     pub UNCOMMON_CODEPOINTS,
  12     Warn,
  13     "detects uncommon Unicode codepoints in identifiers"
  14 }
  15
  16 declare_lint_pass!(NonAsciiIdents => [NON_ASCII_IDENTS, UNCOMMON_CODEPOINTS]);
  17
  18 impl EarlyLintPass for NonAsciiIdents {
  19     fn check_ident(&mut self, cx: &EarlyContext<'_>, ident: ast::Ident) {
  20         use unicode_security::GeneralSecurityProfile;
  21         let name_str = ident.name.as_str();
  22         if name_str.is_ascii() {
  23             return;
  24         }
  25         cx.struct_span_lint(
  26             NON_ASCII_IDENTS,
  27             ident.span,
  28             "identifier contains non-ASCII characters",
  29         )
  30         .emit();
  31         if !name_str.chars().all(GeneralSecurityProfile::identifier_allowed) {
  32             cx.struct_span_lint(
  33                 UNCOMMON_CODEPOINTS,
  34                 ident.span,
  35                 "identifier contains uncommon Unicode codepoints",
  36             )
  37             .emit();
  38         }
  39     }
  40 }