use rustc::hir::*;
use rustc::lint::*;
use syntax::ast::LitKind;
use utils::{is_direct_expn_of, match_def_path, opt_def_id, paths, resolve_node, span_lint};
declare_clippy_lint! {
pub PANIC_PARAMS,
style,
"missing parameters in `panic!` calls"
}
#[allow(missing_copy_implementations)]
pub struct Pass;
impl LintPass for Pass {
fn get_lints(&self) -> LintArray {
lint_array!(PANIC_PARAMS)
}
}
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Pass {
fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) {
if_chain! {
if let ExprBlock(ref block) = expr.node;
if let Some(ref ex) = block.expr;
if let ExprCall(ref fun, ref params) = ex.node;
if params.len() == 2;
if let ExprPath(ref qpath) = fun.node;
if let Some(fun_def_id) = opt_def_id(resolve_node(cx, qpath, fun.hir_id));
if match_def_path(cx.tcx, fun_def_id, &paths::BEGIN_PANIC);
if let ExprLit(ref lit) = params[0].node;
if is_direct_expn_of(expr.span, "panic").is_some();
if let LitKind::Str(ref string, _) = lit.node;
let string = string.as_str().replace("{{", "").replace("}}", "");
if let Some(par) = string.find('{');
if string[par..].contains('}');
if params[0].span.source_callee().is_none();
if params[0].span.lo() != params[0].span.hi();
then {
span_lint(cx, PANIC_PARAMS, params[0].span,
"you probably are missing some parameter in your format string");
}
}
}
}