Module ext 

Extension traits for common syn AST types. Extension traits for common syn AST types.

Provides ergonomic helpers for working with attributes, metadata, fields, types, data, and items in procedural macros. Requires the ext feature (zyn = { features = ["ext"] }).

Overview

Trait	Target	Purpose
[AttrExt]	syn::Attribute	Name checking, argument parsing, dot-path metadata queries
[MetaExt]	syn::Meta	Variant predicates, conversions, nested navigation
[FieldExt]	syn::Field	Dot-path metadata queries on struct/enum fields
[FieldsExt]	syn::Fields, syn::ItemStruct, etc.	Variant predicates and field lookup via [FieldKey]
[TypeExt]	syn::Type, syn::Field	Detecting Option/Result wrappers, inner type extraction
[DataExt]	syn::Data	Variant predicates and conversions for struct/enum/union data
[ItemExt]	syn::Item	Variant predicates, conversions, and common field accessors
[VariantExt]	syn::Variant	Dot-path metadata queries on enum variants

Examples

use zyn::ext::{AttrExt, MetaExt, FieldExt, FieldsExt, FieldKey, TypeExt, DataExt, ItemExt, VariantExt};

// Attribute querying with dot-paths
if attr.is("serde") {
    let rename = attr.get("rename");
}

// Field attribute navigation
let meta = field.get("serde.rename");

// Fields lookup
let key: FieldKey = "id".into();
if let Some(f) = fields.get(&key) {
    // ...
}

// Type inspection
if field.is_option() {
    let inner = field.inner_type().unwrap();
}

// Data variant checking
if data.is_enum() {
    let e = data.as_enum().unwrap();
}

// Item accessors
let ident = item.ident();
let attrs = item.attrs();

Enums

FieldKey

Identifies a struct field by name or position.

Traits

AttrExt

Extension methods for a single syn::Attribute.

DataExt

Extension methods for syn::Data.

FieldExt

Extension methods for a single syn::Field.

FieldsExt

Extension methods for types that contain syn::Fields.

ItemExt

Extension methods for syn::Item.

MetaExt

Extension methods for a single syn::Meta.

TypeExt

Extension methods for detecting and unwrapping common type wrappers.

VariantExt

Extension methods for a single syn::Variant.