mirror of
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Added record key renaming for derive macros IntoValue
and FromValue
(#13699)
# Description Using derived `IntoValue` and `FromValue` implementations on structs with named fields currently produce `Value::Record`s where each key is the key of the Rust struct. For records like the `$nu` constant, that won't work as this record uses `kebab-case` for it's keys. To accomodate this, I upgraded the `#[nu_value(rename_all = "...")]` helper attribute to also work on structs with named fields which will rename the keys via the same case conversion as the enums already have. # User-Facing Changes Users of these macros may choose different key styles for their in `Value` representation. # Tests + Formatting I added the same test suite as enums already have and updated the traits documentation with more examples that also pass the doc test. # After Submitting I played around with the `$nu` constant but got stuck at the point that these keys are kebab-cased, with this, I can play around more with it.
This commit is contained in:
parent
da98c23ab3
commit
1128df2d29
@ -3,21 +3,12 @@ use syn::{spanned::Spanned, Attribute, Fields, LitStr};
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use crate::{error::DeriveError, HELPER_ATTRIBUTE};
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#[derive(Debug)]
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#[derive(Debug, Default)]
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pub struct ContainerAttributes {
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pub rename_all: Case,
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pub rename_all: Option<Case>,
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pub type_name: Option<String>,
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}
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impl Default for ContainerAttributes {
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fn default() -> Self {
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Self {
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rename_all: Case::Snake,
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type_name: None,
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}
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}
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}
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impl ContainerAttributes {
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pub fn parse_attrs<'a, M>(
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iter: impl Iterator<Item = &'a Attribute>,
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@ -59,7 +50,7 @@ impl ContainerAttributes {
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return Ok(()); // We stored the err in `err`.
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}
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};
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container_attrs.rename_all = case;
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container_attrs.rename_all = Some(case);
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}
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"type_name" => {
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let type_name: LitStr = meta.value()?.parse()?;
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@ -1,4 +1,4 @@
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use convert_case::Casing;
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use convert_case::{Case, Casing};
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use proc_macro2::TokenStream as TokenStream2;
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use quote::{quote, ToTokens};
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use syn::{
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@ -54,7 +54,7 @@ fn derive_struct_from_value(
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let container_attrs = ContainerAttributes::parse_attrs(attrs.iter())?;
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attributes::deny_fields(&data.fields)?;
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let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
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let from_value_impl = struct_from_value(&data);
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let from_value_impl = struct_from_value(&data, container_attrs.rename_all);
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let expected_type_impl =
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struct_expected_type(&data.fields, container_attrs.type_name.as_deref());
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Ok(quote! {
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@ -70,7 +70,7 @@ fn derive_struct_from_value(
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///
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/// This function constructs the `from_value` function for structs.
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/// The implementation is straightforward as most of the heavy lifting is handled by
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/// `parse_value_via_fields`, and this function only needs to construct the signature around it.
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/// [`parse_value_via_fields`], and this function only needs to construct the signature around it.
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///
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/// For structs with named fields, this constructs a large return type where each field
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/// contains the implementation for that specific field.
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@ -198,8 +198,8 @@ fn derive_struct_from_value(
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/// }
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/// }
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/// ```
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fn struct_from_value(data: &DataStruct) -> TokenStream2 {
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let body = parse_value_via_fields(&data.fields, quote!(Self));
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fn struct_from_value(data: &DataStruct, rename_all: Option<Case>) -> TokenStream2 {
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let body = parse_value_via_fields(&data.fields, quote!(Self), rename_all);
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quote! {
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fn from_value(
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v: nu_protocol::Value
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@ -437,7 +437,7 @@ fn enum_from_value(data: &DataEnum, attrs: &[Attribute]) -> Result<TokenStream2,
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let ident = &variant.ident;
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let ident_s = format!("{ident}")
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.as_str()
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.to_case(container_attrs.rename_all);
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.to_case(container_attrs.rename_all.unwrap_or(Case::Snake));
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match &variant.fields {
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Fields::Named(fields) => Err(DeriveError::UnsupportedEnums {
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fields_span: fields.span(),
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@ -511,7 +511,7 @@ fn enum_expected_type(attr_type_name: Option<&str>) -> Option<TokenStream2> {
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/// Parses a `Value` into self.
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///
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/// This function handles the actual parsing of a `Value` into self.
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/// It takes two parameters: `fields` and `self_ident`.
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/// It takes three parameters: `fields`, `self_ident` and `rename_all`.
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/// The `fields` parameter determines the expected type of `Value`: named fields expect a
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/// `Value::Record`, unnamed fields expect a `Value::List`, and a unit expects `Value::Nothing`.
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///
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@ -525,6 +525,10 @@ fn enum_expected_type(attr_type_name: Option<&str>) -> Option<TokenStream2> {
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/// For structs, `Self` is usually sufficient, but for enums, `Self::Variant` may be needed in the
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/// future.
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///
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/// The `rename_all` parameter is provided through `#[nu_value(rename_all = "...")]` and describes
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/// how, if passed, the field keys in the `Value` should be named.
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/// If this is `None`, we keep the names as they are in the struct.
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///
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/// This function is more complex than the equivalent for `IntoValue` due to error handling
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/// requirements.
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/// For missing fields, `ShellError::CantFindColumn` is used, and for unit structs,
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@ -533,12 +537,19 @@ fn enum_expected_type(attr_type_name: Option<&str>) -> Option<TokenStream2> {
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/// that poorly named fields don't cause issues.
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/// While this style is not typically recommended in handwritten Rust, it is acceptable for code
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/// generation.
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fn parse_value_via_fields(fields: &Fields, self_ident: impl ToTokens) -> TokenStream2 {
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fn parse_value_via_fields(
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fields: &Fields,
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self_ident: impl ToTokens,
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rename_all: Option<Case>,
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) -> TokenStream2 {
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match fields {
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Fields::Named(fields) => {
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let fields = fields.named.iter().map(|field| {
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let ident = field.ident.as_ref().expect("named has idents");
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let ident_s = ident.to_string();
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let mut ident_s = ident.to_string();
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if let Some(rename_all) = rename_all {
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ident_s = ident_s.to_case(rename_all);
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}
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let ty = &field.ty;
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match type_is_option(ty) {
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true => quote! {
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@ -1,4 +1,4 @@
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use convert_case::Casing;
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use convert_case::{Case, Casing};
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use proc_macro2::TokenStream as TokenStream2;
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use quote::{quote, ToTokens};
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use syn::{
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@ -50,6 +50,9 @@ pub fn derive_into_value(input: TokenStream2) -> Result<TokenStream2, DeriveErro
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/// For structs with unnamed fields, this generates a `Value::List` with each field in the list.
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/// For unit structs, this generates `Value::Nothing`, because there is no data.
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///
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/// This function provides the signature and prepares the call to the [`fields_return_value`]
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/// function which does the heavy lifting of creating the `Value` calls.
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///
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/// # Examples
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///
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/// These examples show what the macro would generate.
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@ -107,7 +110,7 @@ fn struct_into_value(
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generics: Generics,
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attrs: Vec<Attribute>,
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) -> Result<TokenStream2, DeriveError> {
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let _ = ContainerAttributes::parse_attrs(attrs.iter())?;
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let rename_all = ContainerAttributes::parse_attrs(attrs.iter())?.rename_all;
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attributes::deny_fields(&data.fields)?;
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let record = match &data.fields {
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Fields::Named(fields) => {
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@ -116,7 +119,7 @@ fn struct_into_value(
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.iter()
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.map(|field| field.ident.as_ref().expect("named has idents"))
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.map(|ident| quote!(self.#ident));
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fields_return_value(&data.fields, accessor)
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fields_return_value(&data.fields, accessor, rename_all)
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}
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Fields::Unnamed(fields) => {
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let accessor = fields
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@ -125,7 +128,7 @@ fn struct_into_value(
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.enumerate()
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.map(|(n, _)| Index::from(n))
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.map(|index| quote!(self.#index));
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fields_return_value(&data.fields, accessor)
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fields_return_value(&data.fields, accessor, rename_all)
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}
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Fields::Unit => quote!(nu_protocol::Value::nothing(span)),
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};
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@ -184,7 +187,7 @@ fn enum_into_value(
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let ident = variant.ident;
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let ident_s = format!("{ident}")
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.as_str()
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.to_case(container_attrs.rename_all);
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.to_case(container_attrs.rename_all.unwrap_or(Case::Snake));
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match &variant.fields {
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// In the future we can implement more complexe enums here.
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Fields::Named(fields) => Err(DeriveError::UnsupportedEnums {
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@ -216,11 +219,13 @@ fn enum_into_value(
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///
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/// This function handles the construction of the final `Value` that the macro generates.
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/// It is currently only used for structs but may be used for enums in the future.
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/// The function takes two parameters: the `fields`, which allow iterating over each field of a data
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/// type, and the `accessor`.
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/// The function takes three parameters: the `fields`, which allow iterating over each field of a
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/// data type, the `accessor` and `rename_all`.
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/// The fields determine whether we need to generate a `Value::Record`, `Value::List`, or
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/// `Value::Nothing`.
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/// For named fields, they are also directly used to generate the record key.
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/// If `#[nu_value(rename_all = "...")]` is used and then passed in here via `rename_all`, the
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/// named fields will be converted to the given case and then uses as the record key.
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///
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/// The `accessor` parameter generalizes how the data is accessed.
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/// For named fields, this is usually the name of the fields preceded by `self` in a struct, and
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@ -233,6 +238,7 @@ fn enum_into_value(
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fn fields_return_value(
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fields: &Fields,
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accessor: impl Iterator<Item = impl ToTokens>,
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rename_all: Option<Case>,
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) -> TokenStream2 {
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match fields {
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Fields::Named(fields) => {
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@ -242,7 +248,10 @@ fn fields_return_value(
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.zip(accessor)
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.map(|(field, accessor)| {
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let ident = field.ident.as_ref().expect("named has idents");
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let field = ident.to_string();
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let mut field = ident.to_string();
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if let Some(rename_all) = rename_all {
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field = field.to_case(rename_all);
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}
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quote!(#field => nu_protocol::IntoValue::into_value(#accessor, span))
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})
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.collect();
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///
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/// # Derivable
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/// This trait can be used with `#[derive]`.
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///
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/// When derived on structs with named fields, it expects a [`Value::Record`] where each field of
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/// the struct maps to a corresponding field in the record.
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/// You can customize the case conversion of these field names by using
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/// `#[nu_value(rename_all = "...")]` on the struct.
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/// Supported case conversions include those provided by [`convert_case::Case`], such as
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/// "snake_case", "kebab-case", "PascalCase", and others.
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/// Additionally, all values accepted by
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/// [`#[serde(rename_all = "...")]`](https://serde.rs/container-attrs.html#rename_all) are valid here.
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/// If not set, the field names will match the original Rust field names as-is.
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///
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/// For structs with unnamed fields, it expects a [`Value::List`], and the fields are populated in
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/// the order they appear in the list.
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/// Unit structs expect a [`Value::Nothing`], as they contain no data.
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/// Unit structs expect a [`Value::Nothing`], as they contain no data.
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/// Attempting to convert from a non-matching `Value` type will result in an error.
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///
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/// Only enums with no fields may derive this trait.
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/// The expected value representation will be the name of the variant as a [`Value::String`].
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/// By default, variant names will be expected in ["snake_case"](convert_case::Case::Snake).
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/// You can customize the case conversion using `#[nu_value(rename_all = "kebab-case")]` on the enum.
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/// All deterministic and useful case conversions provided by [`convert_case::Case`] are supported
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/// by specifying the case name followed by "case".
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/// Also all values for
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/// [`#[serde(rename_all = "...")]`](https://serde.rs/container-attrs.html#rename_all) are valid
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/// here.
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///
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/// Additionally, you can use `#[nu_value(type_name = "...")]` in the derive macro to set a custom type name
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/// for `FromValue::expected_type`. This will result in a `Type::Custom` with the specified type name.
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/// This can be useful in situations where the default type name is not desired.
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///
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/// ```
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/// # use nu_protocol::{FromValue, Value, ShellError};
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/// # use nu_protocol::{FromValue, Value, ShellError, record, Span};
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/// #
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/// # let span = Span::unknown();
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/// #
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/// #[derive(FromValue, Debug, PartialEq)]
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/// #[nu_value(rename_all = "COBOL-CASE", type_name = "birb")]
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/// enum Bird {
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@ -57,6 +64,30 @@ use std::{
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/// &Bird::expected_type().to_string(),
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/// "birb"
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/// );
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///
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///
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/// #[derive(FromValue, PartialEq, Eq, Debug)]
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/// #[nu_value(rename_all = "kebab-case")]
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/// struct Person {
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/// first_name: String,
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/// last_name: String,
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/// age: u32,
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/// }
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///
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/// let value = Value::record(record! {
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/// "first-name" => Value::string("John", span),
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/// "last-name" => Value::string("Doe", span),
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/// "age" => Value::int(42, span),
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/// }, span);
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///
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/// assert_eq!(
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/// Person::from_value(value).unwrap(),
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/// Person {
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/// first_name: "John".into(),
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/// last_name: "Doe".into(),
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/// age: 42,
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/// }
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/// );
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/// ```
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pub trait FromValue: Sized {
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// TODO: instead of ShellError, maybe we could have a FromValueError that implements Into<ShellError>
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@ -10,6 +10,11 @@ use crate::{Record, ShellError, Span, Value};
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/// This trait can be used with `#[derive]`.
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/// When derived on structs with named fields, the resulting value representation will use
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/// [`Value::Record`], where each field of the record corresponds to a field of the struct.
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/// By default, field names will be kept as-is, but you can customize the case conversion
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/// for all fields in a struct by using `#[nu_value(rename_all = "kebab-case")]` on the struct.
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/// All useful case options from [`convert_case::Case`] are supported, as well as the
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/// values allowed by [`#[serde(rename_all)]`](https://serde.rs/container-attrs.html#rename_all).
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///
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/// For structs with unnamed fields, the value representation will be [`Value::List`], with all
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/// fields inserted into a list.
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/// Unit structs will be represented as [`Value::Nothing`] since they contain no data.
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@ -18,14 +23,12 @@ use crate::{Record, ShellError, Span, Value};
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/// The resulting value representation will be the name of the variant as a [`Value::String`].
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/// By default, variant names will be converted to ["snake_case"](convert_case::Case::Snake).
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/// You can customize the case conversion using `#[nu_value(rename_all = "kebab-case")]` on the enum.
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/// All deterministic and useful case conversions provided by [`convert_case::Case`] are supported
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/// by specifying the case name followed by "case".
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/// Also all values for
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/// [`#[serde(rename_all = "...")]`](https://serde.rs/container-attrs.html#rename_all) are valid
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/// here.
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///
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/// ```
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/// # use nu_protocol::{IntoValue, Value, Span};
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/// # use nu_protocol::{IntoValue, Value, Span, record};
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/// #
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/// # let span = Span::unknown();
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/// #
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/// #[derive(IntoValue)]
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/// #[nu_value(rename_all = "COBOL-CASE")]
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/// enum Bird {
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@ -35,9 +38,31 @@ use crate::{Record, ShellError, Span, Value};
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/// }
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///
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/// assert_eq!(
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/// Bird::RiverDuck.into_value(Span::unknown()),
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/// Bird::RiverDuck.into_value(span),
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/// Value::test_string("RIVER-DUCK")
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/// );
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///
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///
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/// #[derive(IntoValue)]
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/// #[nu_value(rename_all = "kebab-case")]
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/// struct Person {
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/// first_name: String,
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/// last_name: String,
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/// age: u32,
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/// }
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///
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/// assert_eq!(
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/// Person {
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/// first_name: "John".into(),
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/// last_name: "Doe".into(),
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/// age: 42,
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/// }.into_value(span),
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/// Value::record(record! {
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/// "first-name" => Value::string("John", span),
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/// "last-name" => Value::string("Doe", span),
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/// "age" => Value::int(42, span),
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/// }, span)
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/// );
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/// ```
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pub trait IntoValue: Sized {
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/// Converts the given value to a [`Value`].
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@ -384,62 +384,133 @@ fn enum_incorrect_type() {
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assert!(res.is_err());
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}
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// Generate the `Enum` from before but with all possible `rename_all` variants.
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macro_rules! enum_rename_all {
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($($ident:ident: $case:literal => [$a1:literal, $b2:literal, $c3:literal]),*) => {
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$(
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#[derive(Debug, PartialEq, IntoValue, FromValue)]
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#[nu_value(rename_all = $case)]
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enum $ident {
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AlphaOne,
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BetaTwo,
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CharlieThree
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}
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mod enum_rename_all {
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use super::*;
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use crate as nu_protocol;
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impl $ident {
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fn make() -> [Self; 3] {
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[Self::AlphaOne, Self::BetaTwo, Self::CharlieThree]
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// Generate the `Enum` from before but with all possible `rename_all` variants.
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macro_rules! enum_rename_all {
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($($ident:ident: $case:literal => [$a1:literal, $b2:literal, $c3:literal]),*) => {
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$(
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#[derive(Debug, PartialEq, IntoValue, FromValue)]
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#[nu_value(rename_all = $case)]
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enum $ident {
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AlphaOne,
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BetaTwo,
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CharlieThree
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}
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fn value() -> Value {
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Value::test_list(vec![
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Value::test_string($a1),
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Value::test_string($b2),
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Value::test_string($c3),
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])
|
||||
impl $ident {
|
||||
fn make() -> [Self; 3] {
|
||||
[Self::AlphaOne, Self::BetaTwo, Self::CharlieThree]
|
||||
}
|
||||
|
||||
fn value() -> Value {
|
||||
Value::test_list(vec![
|
||||
Value::test_string($a1),
|
||||
Value::test_string($b2),
|
||||
Value::test_string($c3),
|
||||
])
|
||||
}
|
||||
}
|
||||
}
|
||||
)*
|
||||
)*
|
||||
|
||||
#[test]
|
||||
fn enum_rename_all_into_value() {$({
|
||||
let expected = $ident::value();
|
||||
let actual = $ident::make().into_test_value();
|
||||
assert_eq!(expected, actual);
|
||||
})*}
|
||||
#[test]
|
||||
fn into_value() {$({
|
||||
let expected = $ident::value();
|
||||
let actual = $ident::make().into_test_value();
|
||||
assert_eq!(expected, actual);
|
||||
})*}
|
||||
|
||||
#[test]
|
||||
fn enum_rename_all_from_value() {$({
|
||||
let expected = $ident::make();
|
||||
let actual = <[$ident; 3]>::from_value($ident::value()).unwrap();
|
||||
assert_eq!(expected, actual);
|
||||
})*}
|
||||
#[test]
|
||||
fn from_value() {$({
|
||||
let expected = $ident::make();
|
||||
let actual = <[$ident; 3]>::from_value($ident::value()).unwrap();
|
||||
assert_eq!(expected, actual);
|
||||
})*}
|
||||
}
|
||||
}
|
||||
|
||||
enum_rename_all! {
|
||||
Upper: "UPPER CASE" => ["ALPHA ONE", "BETA TWO", "CHARLIE THREE"],
|
||||
Lower: "lower case" => ["alpha one", "beta two", "charlie three"],
|
||||
Title: "Title Case" => ["Alpha One", "Beta Two", "Charlie Three"],
|
||||
Camel: "camelCase" => ["alphaOne", "betaTwo", "charlieThree"],
|
||||
Pascal: "PascalCase" => ["AlphaOne", "BetaTwo", "CharlieThree"],
|
||||
Snake: "snake_case" => ["alpha_one", "beta_two", "charlie_three"],
|
||||
UpperSnake: "UPPER_SNAKE_CASE" => ["ALPHA_ONE", "BETA_TWO", "CHARLIE_THREE"],
|
||||
Kebab: "kebab-case" => ["alpha-one", "beta-two", "charlie-three"],
|
||||
Cobol: "COBOL-CASE" => ["ALPHA-ONE", "BETA-TWO", "CHARLIE-THREE"],
|
||||
Train: "Train-Case" => ["Alpha-One", "Beta-Two", "Charlie-Three"],
|
||||
Flat: "flatcase" => ["alphaone", "betatwo", "charliethree"],
|
||||
UpperFlat: "UPPERFLATCASE" => ["ALPHAONE", "BETATWO", "CHARLIETHREE"]
|
||||
}
|
||||
}
|
||||
|
||||
enum_rename_all! {
|
||||
Upper: "UPPER CASE" => ["ALPHA ONE", "BETA TWO", "CHARLIE THREE"],
|
||||
Lower: "lower case" => ["alpha one", "beta two", "charlie three"],
|
||||
Title: "Title Case" => ["Alpha One", "Beta Two", "Charlie Three"],
|
||||
Camel: "camelCase" => ["alphaOne", "betaTwo", "charlieThree"],
|
||||
Pascal: "PascalCase" => ["AlphaOne", "BetaTwo", "CharlieThree"],
|
||||
Snake: "snake_case" => ["alpha_one", "beta_two", "charlie_three"],
|
||||
UpperSnake: "UPPER_SNAKE_CASE" => ["ALPHA_ONE", "BETA_TWO", "CHARLIE_THREE"],
|
||||
Kebab: "kebab-case" => ["alpha-one", "beta-two", "charlie-three"],
|
||||
Cobol: "COBOL-CASE" => ["ALPHA-ONE", "BETA-TWO", "CHARLIE-THREE"],
|
||||
Train: "Train-Case" => ["Alpha-One", "Beta-Two", "Charlie-Three"],
|
||||
Flat: "flatcase" => ["alphaone", "betatwo", "charliethree"],
|
||||
UpperFlat: "UPPERFLATCASE" => ["ALPHAONE", "BETATWO", "CHARLIETHREE"]
|
||||
mod named_fields_struct_rename_all {
|
||||
use super::*;
|
||||
use crate as nu_protocol;
|
||||
|
||||
macro_rules! named_fields_struct_rename_all {
|
||||
($($ident:ident: $case:literal => [$a1:literal, $b2:literal, $c3:literal]),*) => {
|
||||
$(
|
||||
#[derive(Debug, PartialEq, IntoValue, FromValue)]
|
||||
#[nu_value(rename_all = $case)]
|
||||
struct $ident {
|
||||
alpha_one: (),
|
||||
beta_two: (),
|
||||
charlie_three: (),
|
||||
}
|
||||
|
||||
impl $ident {
|
||||
fn make() -> Self {
|
||||
Self {
|
||||
alpha_one: (),
|
||||
beta_two: (),
|
||||
charlie_three: (),
|
||||
}
|
||||
}
|
||||
|
||||
fn value() -> Value {
|
||||
Value::test_record(record! {
|
||||
$a1 => Value::test_nothing(),
|
||||
$b2 => Value::test_nothing(),
|
||||
$c3 => Value::test_nothing(),
|
||||
})
|
||||
}
|
||||
}
|
||||
)*
|
||||
|
||||
#[test]
|
||||
fn into_value() {$({
|
||||
let expected = $ident::value();
|
||||
let actual = $ident::make().into_test_value();
|
||||
assert_eq!(expected, actual);
|
||||
})*}
|
||||
|
||||
#[test]
|
||||
fn from_value() {$({
|
||||
let expected = $ident::make();
|
||||
let actual = $ident::from_value($ident::value()).unwrap();
|
||||
assert_eq!(expected, actual);
|
||||
})*}
|
||||
}
|
||||
}
|
||||
|
||||
named_fields_struct_rename_all! {
|
||||
Upper: "UPPER CASE" => ["ALPHA ONE", "BETA TWO", "CHARLIE THREE"],
|
||||
Lower: "lower case" => ["alpha one", "beta two", "charlie three"],
|
||||
Title: "Title Case" => ["Alpha One", "Beta Two", "Charlie Three"],
|
||||
Camel: "camelCase" => ["alphaOne", "betaTwo", "charlieThree"],
|
||||
Pascal: "PascalCase" => ["AlphaOne", "BetaTwo", "CharlieThree"],
|
||||
Snake: "snake_case" => ["alpha_one", "beta_two", "charlie_three"],
|
||||
UpperSnake: "UPPER_SNAKE_CASE" => ["ALPHA_ONE", "BETA_TWO", "CHARLIE_THREE"],
|
||||
Kebab: "kebab-case" => ["alpha-one", "beta-two", "charlie-three"],
|
||||
Cobol: "COBOL-CASE" => ["ALPHA-ONE", "BETA-TWO", "CHARLIE-THREE"],
|
||||
Train: "Train-Case" => ["Alpha-One", "Beta-Two", "Charlie-Three"],
|
||||
Flat: "flatcase" => ["alphaone", "betatwo", "charliethree"],
|
||||
UpperFlat: "UPPERFLATCASE" => ["ALPHAONE", "BETATWO", "CHARLIETHREE"]
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(IntoValue, FromValue, Debug, PartialEq)]
|
||||
|
Loading…
Reference in New Issue
Block a user