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Make block_in_if_condition auto applicable

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This commit is contained in:
flip1995 2020-02-04 16:08:15 +01:00
parent 5fd22b3f93
commit 19f08c200e
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GPG Key ID: 693086869D506637
1 changed files with 32 additions and 15 deletions
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47
clippy_lints/src/block_in_if_condition.rs
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@ -2,6 +2,7 @@
use matches::matches;
use rustc::hir::map::Map;
use rustc::lint::in_external_macro;
use rustc_errors::Applicability;
use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
use rustc_hir::*;
use rustc_lint::{LateContext, LateLintPass, LintContext};
@ -79,8 +80,8 @@ fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) {
if in_external_macro(cx.sess(), expr.span) {
return;
}
if let Some((check, then, _)) = higher::if_block(&expr) {
if let ExprKind::Block(block, _) = &check.kind {
if let Some((cond, _, _)) = higher::if_block(&expr) {
if let ExprKind::Block(block, _) = &cond.kind {
if block.rules == BlockCheckMode::DefaultBlock {
if block.stmts.is_empty() {
if let Some(ex) = &block.expr {
@ -89,16 +90,24 @@ fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) {
if expr.span.from_expansion() || differing_macro_contexts(expr.span, ex.span) {
return;
}
span_lint_and_help(
let mut applicability = Applicability::MachineApplicable;
span_lint_and_sugg(
cx,
BLOCK_IN_IF_CONDITION_EXPR,
check.span,
cond.span,
BRACED_EXPR_MESSAGE,
&format!(
"try\nif {} {} ... ",
snippet_block(cx, ex.span, ".."),
snippet_block(cx, then.span, "..")
"try",
format!(
"{}",
snippet_block_with_applicability(
cx,
ex.span,
"..",
Some(expr.span),
&mut applicability
)
),
applicability,
);
}
} else {
@ -107,22 +116,30 @@ fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) {
return;
}
// move block higher
span_lint_and_help(
let mut applicability = Applicability::MachineApplicable;
span_lint_and_sugg(
cx,
BLOCK_IN_IF_CONDITION_STMT,
check.span,
expr.span.with_hi(cond.span.hi()),
COMPLEX_BLOCK_MESSAGE,
&format!(
"try\nlet res = {};\nif res {} ... ",
snippet_block(cx, block.span, ".."),
snippet_block(cx, then.span, "..")
"try",
format!(
"let res = {}; if res",
snippet_block_with_applicability(
cx,
block.span,
"..",
Some(expr.span),
&mut applicability
),
),
applicability,
);
}
}
} else {
let mut visitor = ExVisitor { found_block: None, cx };
walk_expr(&mut visitor, check);
walk_expr(&mut visitor, cond);
if let Some(block) = visitor.found_block {
span_lint(cx, BLOCK_IN_IF_CONDITION_STMT, block.span, COMPLEX_BLOCK_MESSAGE);
}