Struct Match

pub(crate) struct Match {
    expr: String,
    arms: BTreeMap<(Vec<String>, String), BTreeSet<String>>,
    catch_all: Option<String>,
}

Match formatting class.

Match objects collect all the information needed to emit a Rust match expression, automatically deduplicating overlapping identical arms.

Note that this class is ignorant of Rust types, and considers two fields with the same name to be equivalent. BTreeMap/BTreeSet are used to represent the arms in order to make the order deterministic.

Fields

expr: String

arms: BTreeMap<(Vec<String>, String), BTreeSet<String>>

catch_all: Option<String>

The clause for the placeholder pattern _.

Implementations

impl Match

pub fn new(expr: impl Into<String>) -> Self

Create a new match statement on expr.

fn set_catch_all(&mut self, clause: String)

pub fn arm<T: Into<String>, S: Into<String>>( &mut self, name: T, fields: Vec<S>, body: T, )

Add an arm that reads fields to the Match statement.

pub fn arm_no_fields( &mut self, name: impl Into<String>, body: impl Into<String>, )

Adds an arm that doesn’t read anythings from the fields to the Match statement.