Trait ElementType

Source

pub trait ElementType:
    Copy
    + Eq
    + Hash
    + Send
    + Sync
    + Debug {
    type Role: ElementRole;

    // Required method
    fn role(&self) -> Self::Role;

    // Provided methods
    fn is_role(&self, role: Self::Role) -> bool { ... }
    fn is_universal(&self, role: UniversalElementRole) -> bool { ... }
    fn is_root(&self) -> bool { ... }
    fn is_error(&self) -> bool { ... }
}

Expand description

A trait for types that represent an element’s kind in a syntax tree.

Required Associated Types§

Source

type Role: ElementRole

The associated role type for this element kind.

Required Methods§

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fn role(&self) -> Self::Role

Returns the general syntactic role of this element.

The role enables structural analysis without knowing the specific grammar. For example, a tool can find all UniversalElementRole::Definition nodes to build a symbol outline for any supported language.