Struct rslint_core::groups::errors::NoDuplicateCases

pub struct NoDuplicateCases {}

Disallow duplicate test cases in switch statements.

switch statement clauses can freely have duplicate tests, however this is almost always a mistake, because the second case is unreachable. It is likely that the programmer copied a case clause but did not change the test for it.

Invalid Code Examples

switch (a) {
    case 1:
        break;
    case 2:
        break;
    case 1:
        break;
    default:
        break;
}

switch (a) {
    case foo.bar:
        break;

    case foo . bar:
        break;
}

Implementations

impl NoDuplicateCases

pub fn new() -> Self

Trait Implementations

impl Clone for NoDuplicateCases

fn clone(&self) -> NoDuplicateCases

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl CstRule for NoDuplicateCases

fn check_node(&self, node: &SyntaxNode, ctx: &mut RuleCtx) -> Option<()>

Check an individual node in the syntax tree. You can use the match_ast macro to make matching a node to an ast node easier. The reason this uses nodes and not a visitor is because nodes are more flexible, converting them to an AST node has zero cost and you can easily traverse surrounding nodes. Defaults to doing nothing.

fn check_token(&self, token: &SyntaxToken, ctx: &mut RuleCtx) -> Option<()>

Check an individual token in the syntax tree. Defaults to doing nothing.

fn check_root(&self, root: &SyntaxNode, ctx: &mut RuleCtx) -> Option<()>

Check the root of the tree one time. This method is guaranteed to only be called once. The root's kind will be either SCRIPT or MODULE. Defaults to doing nothing.

impl Debug for NoDuplicateCases

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for NoDuplicateCases

fn default() -> NoDuplicateCases

Returns the "default value" for a type.

impl<'de> Deserialize<'de> for NoDuplicateCases

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
    __D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.

impl Rule for NoDuplicateCases

fn name(&self) -> &'static str

A unique, kebab-case name for the rule.

fn group(&self) -> &'static str

The name of the group this rule belongs to.

fn docs(&self) -> &'static str

Optional docs for the rule, an empty string by default

impl Serialize for NoDuplicateCases

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where
    __S: Serializer, 

Serialize this value into the given Serde serializer.