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