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//! Struct code generation for LlmDeserialize derive macro.
use proc_macro2::TokenStream;
use quote::quote;
use syn::{Fields, GenericArgument, PathArguments, Type};
/// Generate deserialization code for structs with named fields.
pub fn generate_struct_deserialize(
name: &syn::Ident,
data: &syn::DataStruct,
tryparse_crate: &TokenStream,
) -> TokenStream {
match &data.fields {
Fields::Named(fields) => {
let field_names: Vec<_> = fields.named.iter().map(|f| &f.ident).collect();
let field_types: Vec<_> = fields.named.iter().map(|f| &f.ty).collect();
let field_name_strs: Vec<_> = fields
.named
.iter()
.map(|f| f.ident.as_ref().unwrap().to_string())
.collect();
// Check if each field is Option<T>
let is_optional: Vec<_> = field_types.iter().map(|ty| is_option_type(ty)).collect();
// Extract inner type for Option<T> fields
let inner_types: Vec<_> = field_types
.iter()
.zip(&is_optional)
.map(|(ty, opt)| {
if *opt {
extract_option_inner(ty)
} else {
(*ty).clone()
}
})
.collect();
let name_str = name.to_string();
// Generate field descriptor setup (collect to Vec for reuse)
let field_descriptors: Vec<_> = field_name_strs
.iter()
.zip(&field_types)
.zip(&is_optional)
.map(|((name, ty), opt)| {
let type_name = quote!(stringify!(#ty)).to_string();
quote! {
.field(#tryparse_crate::deserializer::FieldDescriptor::new(
#name,
#type_name,
#opt
))
}
})
.collect();
// Generate field extraction for try_deserialize (returns Option)
let field_extractions_strict: Vec<_> = field_names
.iter()
.zip(&inner_types)
.zip(&is_optional)
.map(|((field_name, inner_ty), opt)| {
let field_name_str = field_name.as_ref().unwrap().to_string();
if *opt {
// Optional field
quote! {
let #field_name = fields.get(#field_name_str)
.and_then(|v| v.downcast_ref::<#inner_ty>())
.cloned();
}
} else {
// Required field - return None if missing
quote! {
let #field_name = fields.get(#field_name_str)
.and_then(|v| v.downcast_ref::<#inner_ty>())
.cloned()?;
}
}
})
.collect();
// Generate field extraction for deserialize (returns Result)
let field_extractions_lenient: Vec<_> = field_names.iter().zip(&inner_types).zip(&is_optional).map(|((field_name, inner_ty), opt)| {
let field_name_str = field_name.as_ref().unwrap().to_string();
if *opt {
// Optional field
quote! {
let #field_name = fields.get(#field_name_str)
.and_then(|v| v.downcast_ref::<#inner_ty>())
.cloned();
}
} else {
// Required field
quote! {
let #field_name = fields.get(#field_name_str)
.and_then(|v| v.downcast_ref::<#inner_ty>())
.cloned()
.ok_or_else(|| #tryparse_crate::error::ParseError::DeserializeFailed(
#tryparse_crate::error::DeserializeError::missing_field(#field_name_str)
))?;
}
}
}).collect();
quote! {
fn try_deserialize(
value: &#tryparse_crate::value::FlexValue,
ctx: &mut #tryparse_crate::deserializer::CoercionContext,
) -> Option<Self> {
use std::any::Any;
let mut deserializer = #tryparse_crate::deserializer::StructDeserializer::new()
#(#field_descriptors)*;
let fields = deserializer.try_deserialize(
value,
ctx,
#name_str,
|field_name, field_value, field_ctx| {
// Dispatch to the appropriate field type's LlmDeserialize impl (strict mode only)
match field_name {
#(
#field_name_strs => {
// Try strict deserialization
<#inner_types as #tryparse_crate::deserializer::LlmDeserialize>::try_deserialize(field_value, field_ctx)
.map(|v| Box::new(v) as Box<dyn Any>)
}
)*
_ => None
}
}
).ok()?;
// Extract fields from Box<dyn Any> (strict mode - return None on failure)
#(#field_extractions_strict)*
Some(Self {
#(#field_names),*
})
}
fn deserialize(
value: &#tryparse_crate::value::FlexValue,
ctx: &mut #tryparse_crate::deserializer::CoercionContext,
) -> #tryparse_crate::error::Result<Self> {
use std::any::Any;
let mut deserializer = #tryparse_crate::deserializer::StructDeserializer::new()
#(#field_descriptors)*;
let fields = deserializer.deserialize(
value,
ctx,
#name_str,
|field_name, field_value, field_ctx, strict| {
// Dispatch to the appropriate field type's LlmDeserialize impl
match field_name {
#(
#field_name_strs => {
if strict {
// Try strict deserialization
if let Some(v) = <#inner_types as #tryparse_crate::deserializer::LlmDeserialize>::try_deserialize(field_value, field_ctx) {
Ok(Box::new(v) as Box<dyn Any>)
} else {
Err(#tryparse_crate::error::ParseError::DeserializeFailed(
#tryparse_crate::error::DeserializeError::type_mismatch(
stringify!(#inner_types),
"value"
)
))
}
} else {
// Lenient deserialization
let v = <#inner_types as #tryparse_crate::deserializer::LlmDeserialize>::deserialize(field_value, field_ctx)?;
Ok(Box::new(v) as Box<dyn Any>)
}
}
)*
_ => Err(#tryparse_crate::error::ParseError::DeserializeFailed(
#tryparse_crate::error::DeserializeError::Custom(
format!("Unknown field: {}", field_name)
)
))
}
}
)?;
// Extract fields from Box<dyn Any> (lenient mode - return error on failure)
#(#field_extractions_lenient)*
Ok(Self {
#(#field_names),*
})
}
}
}
Fields::Unnamed(_) => syn::Error::new_spanned(
data.fields.clone(),
"LlmDeserialize does not support tuple structs yet",
)
.to_compile_error(),
Fields::Unit => syn::Error::new_spanned(
data.fields.clone(),
"LlmDeserialize does not support unit structs",
)
.to_compile_error(),
}
}
/// Check if a type is Option<T>
fn is_option_type(ty: &Type) -> bool {
if let Type::Path(type_path) = ty {
if let Some(segment) = type_path.path.segments.last() {
return segment.ident == "Option";
}
}
false
}
/// Extract the inner type T from Option<T>
fn extract_option_inner(ty: &Type) -> Type {
if let Type::Path(type_path) = ty {
if let Some(segment) = type_path.path.segments.last() {
if segment.ident == "Option" {
if let PathArguments::AngleBracketed(args) = &segment.arguments {
if let Some(GenericArgument::Type(inner)) = args.args.first() {
return inner.clone();
}
}
}
}
}
// Fallback: return the original type
ty.clone()
}