use std::collections::BTreeMap;
use proc_macro2::TokenStream;
use quote::{format_ident, quote};
use super::{
Visibility,
attributes::{
generate_deprecated_attr, generate_docs, generate_docs_for_field, generate_outer_attrs, generate_serde_as_attr,
generate_serde_attrs, generate_validation_attrs,
},
coercion,
};
use crate::generator::ast::{
ContentCategory, DerivesProvider, FieldDef, RegexKey, ResponseVariant, RustPrimitive, StatusCodeToken, StructDef,
StructMethod, StructMethodKind, StructToken, TypeRef, ValidationAttribute,
tokens::{ConstToken, EnumToken, EnumVariantToken, MethodNameToken},
};
pub(crate) struct StructGenerator<'a> {
regex_lookup: &'a BTreeMap<RegexKey, ConstToken>,
visibility: Visibility,
}
impl<'a> StructGenerator<'a> {
pub(crate) fn new(regex_lookup: &'a BTreeMap<RegexKey, ConstToken>, visibility: Visibility) -> Self {
Self {
regex_lookup,
visibility,
}
}
pub(crate) fn generate(&self, def: &StructDef) -> TokenStream {
let name = format_ident!("{}", def.name);
let docs = generate_docs(&def.docs);
let vis = self.visibility.to_tokens();
let derives = super::attributes::generate_derives_from_slice(&def.derives());
let outer_attrs = generate_outer_attrs(&def.outer_attrs);
let serde_attrs = generate_serde_attrs(&def.serde_attrs);
let fields = self.generate_fields(&def.name, &def.fields);
let struct_tokens = quote! {
#docs
#outer_attrs
#derives
#serde_attrs
#vis struct #name {
#(#fields),*
}
};
if def.methods.is_empty() {
struct_tokens
} else {
let methods: Vec<TokenStream> = def.methods.iter().map(|m| self.generate_method(m)).collect();
quote! {
#struct_tokens
impl #name {
#(#methods)*
}
}
}
}
fn generate_fields(&self, type_name: &StructToken, fields: &[FieldDef]) -> Vec<TokenStream> {
let vis = self.visibility.to_tokens();
fields
.iter()
.map(|field| {
let name = format_ident!("{}", field.name);
let docs = generate_docs_for_field(field);
let serde_as_attr = generate_serde_as_attr(field.serde_as_attr.as_ref());
let serde_attrs = generate_serde_attrs(&field.serde_attrs);
let doc_hidden_attr = if field.doc_hidden {
quote! { #[doc(hidden)] }
} else {
quote! {}
};
let validation_attrs: Vec<ValidationAttribute> = field
.validation_attrs
.iter()
.map(|attr| match attr {
ValidationAttribute::Regex(_) => {
let key = RegexKey::for_struct(type_name, field.name.as_str());
self.regex_lookup.get(&key).map_or_else(
|| attr.clone(),
|const_token| ValidationAttribute::Regex(const_token.to_string()),
)
}
_ => attr.clone(),
})
.collect();
let validation_attrs = generate_validation_attrs(&validation_attrs);
let deprecated_attr = generate_deprecated_attr(field.deprecated);
let default_attr = if field.default_value.is_some() {
let default_expr = coercion::json_to_rust_literal(field.default_value.as_ref().unwrap(), &field.rust_type);
quote! { #[default(#default_expr)] }
} else {
quote! {}
};
let type_tokens = &field.rust_type;
quote! {
#doc_hidden_attr
#docs
#deprecated_attr
#serde_as_attr
#serde_attrs
#validation_attrs
#default_attr
#vis #name: #type_tokens
}
})
.collect()
}
fn generate_method(&self, method: &StructMethod) -> TokenStream {
let StructMethodKind::ParseResponse {
response_enum,
variants,
} = &method.kind;
let docs = generate_docs(&method.docs);
self.generate_parse_response_method(&method.name, response_enum, variants, &docs)
}
fn generate_parse_response_method(
&self,
method_name: &MethodNameToken,
response_enum: &EnumToken,
variants: &[ResponseVariant],
docs: &TokenStream,
) -> TokenStream {
let vis = self.visibility.to_tokens();
let (defaults, specifics): (Vec<_>, Vec<_>) = variants.iter().partition(|v| v.status_code.is_default());
let default_variant = defaults.first();
let status_matches: Vec<TokenStream> = specifics
.iter()
.map(|variant| {
let condition = Self::status_code_condition(variant.status_code);
let variant_token = &variant.variant_name;
let block = Self::generate_variant_block(
response_enum,
variant_token,
variant.schema_type.as_ref(),
variant.content_category,
true,
);
quote! {
if #condition {
#block
}
}
})
.collect();
let has_status_checks = !status_matches.is_empty();
let status_decl = if has_status_checks {
quote! { let status = req.status(); }
} else {
quote! {}
};
let fallback = if let Some(default) = default_variant {
Self::generate_variant_block(
response_enum,
&default.variant_name,
default.schema_type.as_ref(),
default.content_category,
false,
)
} else {
let unknown_variant = EnumVariantToken::from("Unknown");
quote! {
let _ = req.bytes().await?;
Ok(#response_enum::#unknown_variant)
}
};
quote! {
#docs
#vis async fn #method_name(req: reqwest::Response) -> anyhow::Result<#response_enum> {
#status_decl
#(#status_matches)*
#fallback
}
}
}
fn status_code_condition(status_code: StatusCodeToken) -> TokenStream {
if status_code.is_success() {
return quote! { status.is_success() };
}
if status_code.is_default() {
return quote! { true };
}
match status_code {
StatusCodeToken::Informational1XX => quote! { status.is_informational() },
StatusCodeToken::Redirection3XX => quote! { status.is_redirection() },
StatusCodeToken::ClientError4XX => quote! { status.is_client_error() },
StatusCodeToken::ServerError5XX => quote! { status.is_server_error() },
other => other
.code()
.map_or_else(|| quote! { false }, |code| quote! { status.as_u16() == #code }),
}
}
fn generate_variant_block(
enum_token: &EnumToken,
variant_token: &EnumVariantToken,
schema: Option<&TypeRef>,
content_category: ContentCategory,
is_specific_variant: bool,
) -> TokenStream {
let variant_expr = if schema.is_some() {
quote! { #enum_token::#variant_token(data) }
} else {
quote! { #enum_token::#variant_token }
};
let result_statement = if is_specific_variant {
quote! { return Ok(#variant_expr); }
} else {
quote! { Ok(#variant_expr) }
};
if let Some(schema_type) = schema {
let extraction = Self::generate_data_expression(schema_type, content_category);
quote! {
let data = #extraction;
#result_statement
}
} else {
quote! {
let _ = req.bytes().await?;
#result_statement
}
}
}
fn generate_data_expression(schema_type: &TypeRef, content_category: ContentCategory) -> TokenStream {
let type_token = schema_type;
match content_category {
ContentCategory::Text => {
if schema_type.is_string_like() {
quote! { req.text().await? }
} else if matches!(schema_type.base_type, RustPrimitive::Custom(_)) {
quote! { oas3_gen_support::Diagnostics::<#type_token>::json_with_diagnostics(req).await? }
} else {
quote! { req.text().await?.parse::<#type_token>()? }
}
}
ContentCategory::Binary => {
if matches!(schema_type.base_type, RustPrimitive::Custom(_)) {
quote! { oas3_gen_support::Diagnostics::<#type_token>::json_with_diagnostics(req).await? }
} else {
quote! { req.bytes().await?.to_vec() }
}
}
ContentCategory::Json | ContentCategory::Xml | ContentCategory::FormUrlEncoded | ContentCategory::Multipart => {
quote! { oas3_gen_support::Diagnostics::<#type_token>::json_with_diagnostics(req).await? }
}
}
}
}