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use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::method_chain_args;
use clippy_utils::source::snippet_with_applicability;
use if_chain::if_chain;
use rustc_ast::ast;
use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_lint::LateContext;
use rustc_lint::Lint;
/// Wrapper fn for `CHARS_NEXT_CMP` and `CHARS_LAST_CMP` lints with `unwrap()`.
pub(super) fn check<'tcx>(
cx: &LateContext<'tcx>,
info: &crate::methods::BinaryExprInfo<'_>,
chain_methods: &[&str],
lint: &'static Lint,
suggest: &str,
) -> bool {
if_chain! {
if let Some(args) = method_chain_args(info.chain, chain_methods);
if let hir::ExprKind::Lit(ref lit) = info.other.kind;
if let ast::LitKind::Char(c) = lit.node;
then {
let mut applicability = Applicability::MachineApplicable;
span_lint_and_sugg(
cx,
lint,
info.expr.span,
&format!("you should use the `{}` method", suggest),
"like this",
format!("{}{}.{}('{}')",
if info.eq { "" } else { "!" },
snippet_with_applicability(cx, args[0][0].span, "..", &mut applicability),
suggest,
c.escape_default()),
applicability,
);
true
} else {
false
}
}
}
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