Struct Field

pub struct Field<'a> {
    pub name_in_attr: Cow<'a, String>,
    pub ident: &'a Ident,
    pub ty: &'a Type,
    pub default_expression: Option<DefaultExpression<'a>>,
    pub with_callable: Cow<'a, Expr>,
    pub post_transform: Option<&'a PostfixTransform>,
    pub skip: bool,
    pub multiple: bool,
    pub flatten: bool,
}

Properties needed to generate code for a field in all the contexts where one may appear.

Fields

name_in_attr: Cow<'a, String>

The name presented to the user of the library. This will appear in error messages and will be looked when parsing names.

ident: &'a Ident

The name presented to the author of the library. This will appear in the setters or temporary variables which contain the values.

ty: &'a Type

The type of the field in the input.

default_expression: Option<DefaultExpression<'a>>

with_callable: Cow<'a, Expr>

An expression that will be wrapped in a call to core::convert::identity and then used for converting a provided value into the field value before postfix transforms are called.

post_transform: Option<&'a PostfixTransform>

skip: bool

multiple: bool

flatten: bool

If set, this field will be given all unclaimed meta items and will not be exposed as a standard named field.

Implementations

impl<'a> Field<'a>

pub fn as_name(&'a self) -> Option<&'a str>

Get the name of the meta item that should be matched against input and should be used in diagnostics.

This will be None if the field is skip or flatten, as neither kind of field is addressable by name from the input meta.

pub fn as_declaration(&'a self) -> Declaration<'a>

pub fn as_flatten_initializer( &'a self, parent_field_names: Vec<&'a str>, ) -> FlattenInitializer<'a>

pub fn as_match(&'a self) -> MatchArm<'a>

pub fn as_initializer(&'a self) -> Initializer<'a>

pub fn as_presence_check(&'a self) -> CheckMissing<'a>

Trait Implementations

impl<'a> Clone for Field<'a>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Field<'a>

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

Formats the value using the given formatter.

impl UsesTypeParams for Field<'_>

fn uses_type_params<'b>( &self, options: &Options, type_set: &'b IdentSet, ) -> IdentRefSet<'b>

Returns the subset of the queried type parameters that are used by the implementing syntax element.

fn uses_type_params_cloned( &self, options: &Options, type_set: &IdentSet, ) -> IdentSet

Find all type params using uses_type_params, then clone the found values and return the set.