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// Copyright 2019 The Fuchsia Authors
//
// Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
// This file may not be copied, modified, or distributed except according to
// those terms.
use syn::{Data, DataEnum, DataStruct, DataUnion, Type};
pub trait DataExt {
/// Extract the types of all fields. For enums, extract the types of fields
/// from each variant.
fn field_types(&self) -> Vec<&Type>;
}
impl DataExt for Data {
fn field_types(&self) -> Vec<&Type> {
match self {
Data::Struct(strc) => strc.field_types(),
Data::Enum(enm) => enm.field_types(),
Data::Union(un) => un.field_types(),
}
}
}
impl DataExt for DataStruct {
fn field_types(&self) -> Vec<&Type> {
self.fields.iter().map(|f| &f.ty).collect()
}
}
impl DataExt for DataEnum {
fn field_types(&self) -> Vec<&Type> {
self.variants.iter().flat_map(|var| &var.fields).map(|f| &f.ty).collect()
}
}
impl DataExt for DataUnion {
fn field_types(&self) -> Vec<&Type> {
self.fields.named.iter().map(|f| &f.ty).collect()
}
}
pub trait EnumExt {
fn is_c_like(&self) -> bool;
}
impl EnumExt for DataEnum {
fn is_c_like(&self) -> bool {
self.field_types().is_empty()
}
}