Enum Type

pub enum Type<'a> {
    Named(Cow<'a, str>),
    List(Box<Type<'a>>, Option<usize>),
    NonNullNamed(Cow<'a, str>),
    NonNullList(Box<Type<'a>>, Option<usize>),
}

A type literal in the syntax tree

This enum carries no semantic information and might refer to types that do not exist.

Variants

Named(Cow<'a, str>)

A nullable named type, e.g. String

List(Box<Type<'a>>, Option<usize>)

A nullable list type, e.g. [String]

The list itself is what’s nullable, the containing type might be non-null.

NonNullNamed(Cow<'a, str>)

A non-null named type, e.g. String!

NonNullList(Box<Type<'a>>, Option<usize>)

A non-null list type, e.g. [String]!.

The list itself is what’s non-null, the containing type might be null.

Implementations

impl<'a> Type<'a>

pub fn name(&self) -> Option<&str>

Get the name of a named type.

Only applies to named types; lists will return None.

pub fn innermost_name(&self) -> &str

Get the innermost name by unpacking lists

All type literals contain exactly one named type.

pub fn is_non_null(&self) -> bool

Determines if a type only can represent non-null values.

Trait Implementations

impl<'a> Clone for Type<'a>

fn clone(&self) -> Type<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Type<'a>

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

Formats the value using the given formatter.

impl<'a> Display for Type<'a>

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

Formats the value using the given formatter.

impl<'a> PartialEq for Type<'a>

fn eq(&self, other: &Type<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> Eq for Type<'a>

impl<'a> StructuralPartialEq for Type<'a>