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|
use proc_macro2::TokenStream;
use quote::quote;
use syn::{Data, DeriveInput, Fields, LitStr};
use crate::helpers::{non_enum_error, HasStrumVariantProperties, HasTypeProperties};
pub fn enum_message_inner(ast: &DeriveInput) -> syn::Result<TokenStream> {
let name = &ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
let variants = match &ast.data {
Data::Enum(v) => &v.variants,
_ => return Err(non_enum_error()),
};
let type_properties = ast.get_type_properties()?;
let strum_module_path = type_properties.crate_module_path();
let mut arms = Vec::new();
let mut detailed_arms = Vec::new();
let mut documentation_arms = Vec::new();
let mut serializations = Vec::new();
for variant in variants {
let variant_properties = variant.get_variant_properties()?;
let messages = variant_properties.message.as_ref();
let detailed_messages = variant_properties.detailed_message.as_ref();
let documentation = &variant_properties.documentation;
let ident = &variant.ident;
let params = match variant.fields {
Fields::Unit => quote! {},
Fields::Unnamed(..) => quote! { (..) },
Fields::Named(..) => quote! { {..} },
};
// You can't disable getting the serializations.
{
let serialization_variants =
variant_properties.get_serializations(type_properties.case_style);
let count = serialization_variants.len();
serializations.push(quote! {
&#name::#ident #params => {
static ARR: [&'static str; #count] = [#(#serialization_variants),*];
&ARR
}
});
}
// But you can disable the messages.
if variant_properties.disabled.is_some() {
continue;
}
if let Some(msg) = messages {
let params = params.clone();
// Push the simple message.
let tokens = quote! { &#name::#ident #params => ::core::option::Option::Some(#msg) };
arms.push(tokens.clone());
if detailed_messages.is_none() {
detailed_arms.push(tokens);
}
}
if let Some(msg) = detailed_messages {
let params = params.clone();
// Push the detailed message.
detailed_arms
.push(quote! { &#name::#ident #params => ::core::option::Option::Some(#msg) });
}
if !documentation.is_empty() {
let params = params.clone();
// Strip a single leading space from each documentation line.
let documentation: Vec<LitStr> = documentation.iter().map(|lit_str| {
let line = lit_str.value();
if line.starts_with(' ') {
LitStr::new(&line.as_str()[1..], lit_str.span())
} else {
lit_str.clone()
}
}).collect();
if documentation.len() == 1 {
let text = &documentation[0];
documentation_arms
.push(quote! { &#name::#ident #params => ::core::option::Option::Some(#text) });
} else {
// Push the documentation.
documentation_arms
.push(quote! {
&#name::#ident #params => ::core::option::Option::Some(concat!(#(concat!(#documentation, "\n")),*))
});
}
}
}
if arms.len() < variants.len() {
arms.push(quote! { _ => ::core::option::Option::None });
}
if detailed_arms.len() < variants.len() {
detailed_arms.push(quote! { _ => ::core::option::Option::None });
}
if documentation_arms.len() < variants.len() {
documentation_arms.push(quote! { _ => ::core::option::Option::None });
}
Ok(quote! {
impl #impl_generics #strum_module_path::EnumMessage for #name #ty_generics #where_clause {
fn get_message(&self) -> ::core::option::Option<&'static str> {
match self {
#(#arms),*
}
}
fn get_detailed_message(&self) -> ::core::option::Option<&'static str> {
match self {
#(#detailed_arms),*
}
}
fn get_documentation(&self) -> ::core::option::Option<&'static str> {
match self {
#(#documentation_arms),*
}
}
fn get_serializations(&self) -> &'static [&'static str] {
match self {
#(#serializations),*
}
}
}
})
}
|
