Struct VariableDefinition

pub struct VariableDefinition<'a> {
    pub variable: Variable<'a>,
    pub of_type: Type<'a>,
    pub default_value: Value<'a>,
    pub directives: Directives<'a>,
}

AST Node for a variable definition.

A variable definition defines multiple Variable identifiers that can be used in place of any other non-static Value throughout the document.

Reference

Fields

variable: Variable<'a>

The variable’s name, as in, its identifier, which is prefixed with a $ sign in the document.

of_type: Type<'a>

Annotation of the type of a given variable, which ultimately leads to a type reference of an input type, as defined on a GraphQL schema.

default_value: Value<'a>

A GraphQL variable may be replaced by a default value, when it’s not passed or null is passed for a non-null variable. When this definition doesn’t contain any default value this property is set to Value::Null.

directives: Directives<'a>

Directives that are annotating this Variable Definition.

When no Directives are present, this will be an empty list, as can be checked using Directives::is_empty. See: Directives

Trait Implementations

impl<'a> Clone for VariableDefinition<'a>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for VariableDefinition<'a>

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

Formats the value using the given formatter.

impl<'a> PartialEq for VariableDefinition<'a>

fn eq(&self, other: &VariableDefinition<'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> PrintNode for VariableDefinition<'a>

fn write_to_buffer(&self, level: usize, buffer: &mut dyn Write) -> Result

Write an AST node to a buffer implementing the Write trait.

fn print(&self) -> String

Print an AST Node to source text as a String allocated on the heap.

impl<'arena> WithDirectives<'arena> for VariableDefinition<'arena>

fn directives(&self) -> &Directives<'arena>

impl<'a> StructuralPartialEq for VariableDefinition<'a>