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deduplicate single_match_else reporting

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This commit is contained in:
Oliver Schneider 2017-03-03 15:44:23 +01:00
parent 26270c7451
commit a161d3f8f4
1 changed files with 25 additions and 40 deletions
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65
clippy_lints/src/matches.rs
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@ -198,29 +198,33 @@ fn check_single_match(cx: &LateContext, ex: &Expr, arms: &[Arm], expr: &Expr) {
fn check_single_match_single_pattern(cx: &LateContext, ex: &Expr, arms: &[Arm], expr: &Expr, els: Option<&Expr>) { fn check_single_match_single_pattern(cx: &LateContext, ex: &Expr, arms: &[Arm], expr: &Expr, els: Option<&Expr>) {
if arms[1].pats[0].node == PatKind::Wild { if arms[1].pats[0].node == PatKind::Wild {
let lint = if els.is_some() { report_single_match_single_pattern(cx, ex, arms, expr, els);
SINGLE_MATCH_ELSE
} else {
SINGLE_MATCH
};
let els_str = els.map_or(String::new(), |els| format!(" else {}", expr_block(cx, els, None, "..")));
span_lint_and_then(cx,
lint,
expr.span,
"you seem to be trying to use match for destructuring a single pattern. \
Consider using `if let`",
|db| {
db.span_suggestion(expr.span,
"try this",
format!("if let {} = {} {}{}",
snippet(cx, arms[0].pats[0].span, ".."),
snippet(cx, ex.span, ".."),
expr_block(cx, &arms[0].body, None, ".."),
els_str));
});
} }
} }
fn report_single_match_single_pattern(cx: &LateContext, ex: &Expr, arms: &[Arm], expr: &Expr, els: Option<&Expr>) {
let lint = if els.is_some() {
SINGLE_MATCH_ELSE
} else {
SINGLE_MATCH
};
let els_str = els.map_or(String::new(), |els| format!(" else {}", expr_block(cx, els, None, "..")));
span_lint_and_then(cx,
lint,
expr.span,
"you seem to be trying to use match for destructuring a single pattern. \
Consider using `if let`",
|db| {
db.span_suggestion(expr.span,
"try this",
format!("if let {} = {} {}{}",
snippet(cx, arms[0].pats[0].span, ".."),
snippet(cx, ex.span, ".."),
expr_block(cx, &arms[0].body, None, ".."),
els_str));
});
}
fn check_single_match_opt_like( fn check_single_match_opt_like(
cx: &LateContext, cx: &LateContext,
ex: &Expr, ex: &Expr,
@ -253,26 +257,7 @@ fn check_single_match_opt_like(
for &(ty_path, pat_path) in candidates { for &(ty_path, pat_path) in candidates {
if &path == pat_path && match_type(cx, ty, ty_path) { if &path == pat_path && match_type(cx, ty, ty_path) {
let lint = if els.is_some() { report_single_match_single_pattern(cx, ex, arms, expr, els);
SINGLE_MATCH_ELSE
} else {
SINGLE_MATCH
};
let els_str = els.map_or(String::new(), |els| format!(" else {}", expr_block(cx, els, None, "..")));
span_lint_and_then(cx,
lint,
expr.span,
"you seem to be trying to use match for destructuring a single pattern. Consider \
using `if let`",
|db| {
db.span_suggestion(expr.span,
"try this",
format!("if let {} = {} {}{}",
snippet(cx, arms[0].pats[0].span, ".."),
snippet(cx, ex.span, ".."),
expr_block(cx, &arms[0].body, None, ".."),
els_str));
});
} }
} }
} }