src/tools/clippy/clippy_lints/src/misc_early/literal_suffix.rs

   1 use clippy_utils::diagnostics::span_lint_and_sugg;
   2 use rustc_errors::Applicability;
   3 use rustc_lint::EarlyContext;
   4 use rustc_span::Span;
   5
   6 use super::{SEPARATED_LITERAL_SUFFIX, UNSEPARATED_LITERAL_SUFFIX};
   7
   8 pub(super) fn check(cx: &EarlyContext<'_>, lit_span: Span, lit_snip: &str, suffix: &str, sugg_type: &str) {
   9     let Some(maybe_last_sep_idx) = lit_snip.len().checked_sub(suffix.len() + 1) else {
  10         return; // It's useless so shouldn't lint.
  11     };
  12     // Do not lint when literal is unsuffixed.
  13     if !suffix.is_empty() {
  14         if lit_snip.as_bytes()[maybe_last_sep_idx] == b'_' {
  15             span_lint_and_sugg(
  16                 cx,
  17                 SEPARATED_LITERAL_SUFFIX,
  18                 lit_span,
  19                 &format!("{sugg_type} type suffix should not be separated by an underscore"),
  20                 "remove the underscore",
  21                 format!("{}{suffix}", &lit_snip[..maybe_last_sep_idx]),
  22                 Applicability::MachineApplicable,
  23             );
  24         } else {
  25             span_lint_and_sugg(
  26                 cx,
  27                 UNSEPARATED_LITERAL_SUFFIX,
  28                 lit_span,
  29                 &format!("{sugg_type} type suffix should be separated by an underscore"),
  30                 "add an underscore",
  31                 format!("{}_{suffix}", &lit_snip[..=maybe_last_sep_idx]),
  32                 Applicability::MachineApplicable,
  33             );
  34         }
  35     }
  36 }