bjoernager/rust
bjoernager/rust
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improve cc of function

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This commit is contained in:
Oliver Schneider 2015-12-03 12:43:50 +01:00
parent 3d1b7e1957
commit 04524c549e
1 changed files with 18 additions and 23 deletions
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37
src/methods.rs
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@ -54,20 +54,19 @@ impl LateLintPass for MethodsPass {
if let ExprMethodCall(ref name, _, ref args) = expr.node {
let (obj_ty, ptr_depth) = walk_ptrs_ty_depth(cx.tcx.expr_ty(&args[0]));
if name.node.as_str() == "unwrap" {
if match_type(cx, obj_ty, &OPTION_PATH) {
match &*name.node.as_str() {
"unwrap" if match_type(cx, obj_ty, &OPTION_PATH) => {
span_lint(cx, OPTION_UNWRAP_USED, expr.span,
"used unwrap() on an Option value. If you don't want \
to handle the None case gracefully, consider using \
expect() to provide a better panic message");
} else if match_type(cx, obj_ty, &RESULT_PATH) {
},
"unwrap" if match_type(cx, obj_ty, &RESULT_PATH) => {
span_lint(cx, RESULT_UNWRAP_USED, expr.span,
"used unwrap() on a Result value. Graceful handling \
of Err values is preferred");
}
}
else if name.node.as_str() == "to_string" {
if obj_ty.sty == ty::TyStr {
},
"to_string" if obj_ty.sty == ty::TyStr => {
let mut arg_str = snippet(cx, args[0].span, "_");
if ptr_depth > 1 {
arg_str = Cow::Owned(format!(
@ -77,13 +76,12 @@ impl LateLintPass for MethodsPass {
}
span_lint(cx, STR_TO_STRING, expr.span, &format!(
"`{}.to_owned()` is faster", arg_str));
} else if match_type(cx, obj_ty, &STRING_PATH) {
},
"to_string" if match_type(cx, obj_ty, &STRING_PATH) => {
span_lint(cx, STRING_TO_STRING, expr.span, "`String.to_string()` is a no-op; use \
`clone()` to make a copy");
}
}
else if name.node.as_str() == "expect" {
if let ExprMethodCall(ref inner_name, _, ref inner_args) = args[0].node {
},
"expect" => if let ExprMethodCall(ref inner_name, _, ref inner_args) = args[0].node {
if inner_name.node.as_str() == "ok"
&& match_type(cx, cx.tcx.expr_ty(&inner_args[0]), &RESULT_PATH) {
let result_type = cx.tcx.expr_ty(&inner_args[0]);
@ -96,11 +94,9 @@ impl LateLintPass for MethodsPass {
}
}
}
}
}
},
// check Option.map(_).unwrap_or(_)
else if name.node.as_str() == "unwrap_or" {
if let ExprMethodCall(ref inner_name, _, ref inner_args) = args[0].node {
"unwrap_or" => if let ExprMethodCall(ref inner_name, _, ref inner_args) = args[0].node {
if inner_name.node.as_str() == "map"
&& match_type(cx, cx.tcx.expr_ty(&inner_args[0]), &OPTION_PATH) {
// lint message
@ -126,11 +122,9 @@ impl LateLintPass for MethodsPass {
span_lint(cx, OPTION_MAP_UNWRAP_OR, expr.span, msg);
};
}
}
}
},
// check Option.map(_).unwrap_or_else(_)
else if name.node.as_str() == "unwrap_or_else" {
if let ExprMethodCall(ref inner_name, _, ref inner_args) = args[0].node {
"unwrap_or_else" => if let ExprMethodCall(ref inner_name, _, ref inner_args) = args[0].node {
if inner_name.node.as_str() == "map"
&& match_type(cx, cx.tcx.expr_ty(&inner_args[0]), &OPTION_PATH) {
// lint message
@ -156,7 +150,8 @@ impl LateLintPass for MethodsPass {
span_lint(cx, OPTION_MAP_UNWRAP_OR_ELSE, expr.span, msg);
};
}
}
},
_ => {},
}
}
}