Struct rslint_core::groups::errors::ForDirection

pub struct ForDirection {}

Disallow for loops which update their counter in the wrong direction.

A for loop with a counter may update its value in the wrong direction. that is to say, if i made a counter with a value of 0, if the for statement checked if counter < 10 and the update went counter--, that loop would be infinite. This is because counter will never be smaller than 10 because counter-- always yields a value smaller than 10. A for loop which does this is almost always a bug because it is either unreachable or infinite.

Incorrect Code Examples

for (var i = 0; i < 10; i--) {
    /* infinite loop */
}

for (var i = 10; i >= 20; i++) {
    /* unreachable */
}

Correct Code Examples

for (var i = 0; i < 10; i++) {

}

Implementations

impl ForDirection

pub fn new() -> Self

Trait Implementations

impl Clone for ForDirection

fn clone(&self) -> ForDirection

Returns a copy of the value.

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

Performs copy-assignment from source.

impl CstRule for ForDirection

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 ForDirection

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

Formats the value using the given formatter.

impl Default for ForDirection

fn default() -> ForDirection

Returns the "default value" for a type.

impl<'de> Deserialize<'de> for ForDirection

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

Deserialize this value from the given Serde deserializer.

impl Rule for ForDirection

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 ForDirection

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

Serialize this value into the given Serde serializer.