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use clippy_utils::diagnostics::span_lint_and_sugg;
use rustc_ast::ast::Lit;
use rustc_errors::Applicability;
use rustc_lint::EarlyContext;
use super::{SEPARATED_LITERAL_SUFFIX, UNSEPARATED_LITERAL_SUFFIX};
pub(super) fn check(cx: &EarlyContext<'_>, lit: &Lit, lit_snip: &str, suffix: &str, sugg_type: &str) {
let maybe_last_sep_idx = if let Some(val) = lit_snip.len().checked_sub(suffix.len() + 1) {
val
} else {
return; // It's useless so shouldn't lint.
};
// Do not lint when literal is unsuffixed.
if !suffix.is_empty() {
if lit_snip.as_bytes()[maybe_last_sep_idx] == b'_' {
span_lint_and_sugg(
cx,
SEPARATED_LITERAL_SUFFIX,
lit.span,
&format!("{} type suffix should not be separated by an underscore", sugg_type),
"remove the underscore",
format!("{}{}", &lit_snip[..maybe_last_sep_idx], suffix),
Applicability::MachineApplicable,
);
} else {
span_lint_and_sugg(
cx,
UNSEPARATED_LITERAL_SUFFIX,
lit.span,
&format!("{} type suffix should be separated by an underscore", sugg_type),
"add an underscore",
format!("{}_{}", &lit_snip[..=maybe_last_sep_idx], suffix),
Applicability::MachineApplicable,
);
}
}
}
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