-use crate::utils::{is_direct_expn_of, is_expn_of, match_function_call, paths, span_lint};
+use crate::utils::{is_expn_of, match_panic_call, span_lint};
use if_chain::if_chain;
-use rustc::declare_lint_pass;
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc_session::declare_tool_lint;
+use rustc_hir::Expr;
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::Span;
-use syntax::ast::LitKind;
-
-declare_clippy_lint! {
- /// **What it does:** Checks for missing parameters in `panic!`.
- ///
- /// **Why is this bad?** Contrary to the `format!` family of macros, there are
- /// two forms of `panic!`: if there are no parameters given, the first argument
- /// is not a format string and used literally. So while `format!("{}")` will
- /// fail to compile, `panic!("{}")` will not.
- ///
- /// **Known problems:** None.
- ///
- /// **Example:**
- /// ```no_run
- /// panic!("This `panic!` is probably missing a parameter there: {}");
- /// ```
- pub PANIC_PARAMS,
- style,
- "missing parameters in `panic!` calls"
-}
declare_clippy_lint! {
/// **What it does:** Checks for usage of `panic!`.
/// ```
pub UNREACHABLE,
restriction,
- "`unreachable!` should not be present in production code"
+ "usage of the `unreachable!` macro"
}
-declare_lint_pass!(PanicUnimplemented => [PANIC_PARAMS, UNIMPLEMENTED, UNREACHABLE, TODO, PANIC]);
+declare_lint_pass!(PanicUnimplemented => [UNIMPLEMENTED, UNREACHABLE, TODO, PANIC]);
-impl<'a, 'tcx> LateLintPass<'a, 'tcx> for PanicUnimplemented {
- fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) {
- if_chain! {
- if let ExprKind::Block(ref block, _) = expr.kind;
- if let Some(ref ex) = block.expr;
- if let Some(params) = match_function_call(cx, ex, &paths::BEGIN_PANIC);
- if params.len() == 2;
- then {
- if is_expn_of(expr.span, "unimplemented").is_some() {
- let span = get_outer_span(expr);
- span_lint(cx, UNIMPLEMENTED, span,
- "`unimplemented` should not be present in production code");
- } else if is_expn_of(expr.span, "todo").is_some() {
- let span = get_outer_span(expr);
- span_lint(cx, TODO, span,
- "`todo` should not be present in production code");
- } else if is_expn_of(expr.span, "unreachable").is_some() {
- let span = get_outer_span(expr);
- span_lint(cx, UNREACHABLE, span,
- "`unreachable` should not be present in production code");
- } else if is_expn_of(expr.span, "panic").is_some() {
- let span = get_outer_span(expr);
- span_lint(cx, PANIC, span,
- "`panic` should not be present in production code");
- match_panic(params, expr, cx);
- }
+impl<'tcx> LateLintPass<'tcx> for PanicUnimplemented {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if match_panic_call(cx, expr).is_some() {
+ let span = get_outer_span(expr);
+ if is_expn_of(expr.span, "unimplemented").is_some() {
+ span_lint(
+ cx,
+ UNIMPLEMENTED,
+ span,
+ "`unimplemented` should not be present in production code",
+ );
+ } else if is_expn_of(expr.span, "todo").is_some() {
+ span_lint(cx, TODO, span, "`todo` should not be present in production code");
+ } else if is_expn_of(expr.span, "unreachable").is_some() {
+ span_lint(cx, UNREACHABLE, span, "usage of the `unreachable!` macro");
+ } else if is_expn_of(expr.span, "panic").is_some() {
+ span_lint(cx, PANIC, span, "`panic` should not be present in production code");
}
}
}
}
}
}
-
-fn match_panic(params: &[Expr<'_>], expr: &Expr<'_>, cx: &LateContext<'_, '_>) {
- if_chain! {
- if let ExprKind::Lit(ref lit) = params[0].kind;
- 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");
- }
- }
-}