More refactoring of proc macro...
This commit is contained in:
Graham Esau
parent
631120ead8
commit
b1ded882b7
5 changed files with 421 additions and 419 deletions
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@ -7,14 +7,10 @@ extern crate proc_macro;
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mod ast;
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mod attr;
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mod metadata;
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mod schema_exprs;
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use ast::*;
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use metadata::*;
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use proc_macro2::TokenStream;
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use quote::ToTokens;
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use serde_derive_internals::ast::Style;
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use serde_derive_internals::attr::{self as serde_attr, Default as SerdeDefault, TagType};
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use syn::spanned::Spanned;
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#[proc_macro_derive(JsonSchema, attributes(schemars, serde))]
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pub fn derive_json_schema_wrapper(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
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@ -34,15 +30,7 @@ fn derive_json_schema(mut input: syn::DeriveInput) -> TokenStream {
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Err(e) => return compile_error(&e),
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};
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let schema_expr = match &cont.data {
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Data::Struct(Style::Unit, _) => schema_for_unit_struct(),
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Data::Struct(Style::Newtype, fields) => schema_for_newtype_struct(&fields[0]),
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Data::Struct(Style::Tuple, fields) => schema_for_tuple_struct(fields),
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Data::Struct(Style::Struct, fields) => schema_for_struct(fields, Some(&cont.serde_attrs)),
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Data::Enum(variants) => schema_for_enum(variants, &cont.serde_attrs),
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};
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let doc_metadata = SchemaMetadata::from_doc_attrs(&cont.original.attrs);
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let schema_expr = doc_metadata.apply_to_schema(schema_expr);
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let schema_expr = schema_exprs::expr_for_container(&cont);
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let type_name = &cont.ident;
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let type_params: Vec<_> = cont.generics.type_params().map(|ty| &ty.ident).collect();
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@ -103,397 +91,9 @@ fn add_trait_bounds(generics: &mut syn::Generics) {
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}
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}
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fn wrap_schema_fields(schema_contents: TokenStream) -> TokenStream {
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quote! {
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schemars::schema::Schema::Object(
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schemars::schema::SchemaObject {
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#schema_contents
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..Default::default()
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})
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}
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}
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fn compile_error<'a>(errors: impl IntoIterator<Item = &'a syn::Error>) -> TokenStream {
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let compile_errors = errors.into_iter().map(syn::Error::to_compile_error);
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quote! {
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#(#compile_errors)*
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}
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}
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fn is_unit_variant(v: &Variant) -> bool {
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match v.style {
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Style::Unit => v.with.is_none(),
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_ => false,
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}
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}
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fn schema_for_enum(variants: &[Variant], cattrs: &serde_attr::Container) -> TokenStream {
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let variants = variants
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.iter()
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.filter(|v| !v.serde_attrs.skip_deserializing());
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match cattrs.tag() {
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TagType::External => schema_for_external_tagged_enum(variants),
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TagType::None => schema_for_untagged_enum(variants),
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TagType::Internal { tag } => schema_for_internal_tagged_enum(variants, tag),
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TagType::Adjacent { tag, content } => {
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schema_for_adjacent_tagged_enum(variants, tag, content)
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}
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}
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}
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fn schema_for_external_tagged_enum<'a>(
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variants: impl Iterator<Item = &'a Variant<'a>>,
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) -> TokenStream {
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let (unit_variants, complex_variants): (Vec<_>, Vec<_>) =
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variants.partition(|v| is_unit_variant(v));
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let unit_count = unit_variants.len();
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let unit_names = unit_variants.into_iter().map(|v| v.name());
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let unit_schema = wrap_schema_fields(quote! {
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enum_values: Some(vec![#(#unit_names.into()),*]),
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});
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if complex_variants.is_empty() {
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return unit_schema;
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}
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let mut schemas = Vec::new();
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if unit_count > 0 {
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schemas.push(unit_schema);
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}
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schemas.extend(complex_variants.into_iter().map(|variant| {
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let name = variant.name();
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let sub_schema = schema_for_untagged_enum_variant(variant);
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let schema_expr = wrap_schema_fields(quote! {
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instance_type: Some(schemars::schema::InstanceType::Object.into()),
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object: Some(Box::new(schemars::schema::ObjectValidation {
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properties: {
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let mut props = schemars::Map::new();
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props.insert(#name.to_owned(), #sub_schema);
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props
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},
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required: {
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let mut required = schemars::Set::new();
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required.insert(#name.to_owned());
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required
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},
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..Default::default()
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})),
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});
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let doc_metadata = SchemaMetadata::from_doc_attrs(&variant.original.attrs);
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doc_metadata.apply_to_schema(schema_expr)
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}));
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wrap_schema_fields(quote! {
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subschemas: Some(Box::new(schemars::schema::SubschemaValidation {
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any_of: Some(vec![#(#schemas),*]),
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..Default::default()
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})),
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})
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}
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fn schema_for_internal_tagged_enum<'a>(
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variants: impl Iterator<Item = &'a Variant<'a>>,
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tag_name: &str,
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) -> TokenStream {
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let schemas = variants.map(|variant| {
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let name = variant.name();
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let type_schema = wrap_schema_fields(quote! {
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instance_type: Some(schemars::schema::InstanceType::String.into()),
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enum_values: Some(vec![#name.into()]),
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});
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let tag_schema = wrap_schema_fields(quote! {
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instance_type: Some(schemars::schema::InstanceType::Object.into()),
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object: Some(Box::new(schemars::schema::ObjectValidation {
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properties: {
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let mut props = schemars::Map::new();
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props.insert(#tag_name.to_owned(), #type_schema);
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props
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},
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required: {
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let mut required = schemars::Set::new();
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required.insert(#tag_name.to_owned());
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required
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},
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..Default::default()
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})),
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});
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let doc_metadata = SchemaMetadata::from_doc_attrs(&variant.original.attrs);
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let tag_schema = doc_metadata.apply_to_schema(tag_schema);
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// FIXME this match block is duplicated in schema_for_adjacent_tagged_enum,
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// and is extremely similar to schema_for_untagged_enum_variant
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let variant_schema = match (&variant.with, &variant.style) {
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(Some(with), _) => {
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quote_spanned! {variant.original.span()=>
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<#with>::json_schema(gen)
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}
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}
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(None, Style::Unit) => return tag_schema,
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(None, Style::Newtype) => {
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let field = &variant.fields[0];
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let ty = get_json_schema_type(field);
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quote_spanned! {field.original.span()=>
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<#ty>::json_schema(gen)
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}
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}
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(None, Style::Struct) => schema_for_struct(&variant.fields, None),
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(None, Style::Tuple) => schema_for_tuple_struct(&variant.fields),
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};
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quote! {
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#tag_schema.flatten(#variant_schema)
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}
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});
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wrap_schema_fields(quote! {
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subschemas: Some(Box::new(schemars::schema::SubschemaValidation {
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any_of: Some(vec![#(#schemas),*]),
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..Default::default()
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})),
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})
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}
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fn schema_for_untagged_enum<'a>(variants: impl Iterator<Item = &'a Variant<'a>>) -> TokenStream {
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let schemas = variants.map(|variant| {
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let schema_expr = schema_for_untagged_enum_variant(variant);
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let doc_metadata = SchemaMetadata::from_doc_attrs(&variant.original.attrs);
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doc_metadata.apply_to_schema(schema_expr)
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});
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wrap_schema_fields(quote! {
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subschemas: Some(Box::new(schemars::schema::SubschemaValidation {
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any_of: Some(vec![#(#schemas),*]),
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..Default::default()
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})),
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})
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}
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fn schema_for_untagged_enum_variant(variant: &Variant) -> TokenStream {
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if let Some(with) = &variant.with {
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return quote_spanned! {variant.original.span()=>
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gen.subschema_for::<#with>()
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};
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}
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match variant.style {
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Style::Unit => schema_for_unit_struct(),
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Style::Newtype => schema_for_newtype_struct(&variant.fields[0]),
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Style::Tuple => schema_for_tuple_struct(&variant.fields),
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Style::Struct => schema_for_struct(&variant.fields, None),
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}
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}
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fn schema_for_adjacent_tagged_enum<'a>(
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variants: impl Iterator<Item = &'a Variant<'a>>,
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tag_name: &str,
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content_name: &str,
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) -> TokenStream {
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let schemas = variants.map(|variant| {
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let content_schema = match (&variant.with, &variant.style) {
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(Some(with), _) => Some(quote_spanned! {variant.original.span()=>
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<#with>::json_schema(gen)
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}),
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(None, Style::Unit) => None,
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(None, Style::Newtype) => {
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let field = &variant.fields[0];
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let ty = get_json_schema_type(field);
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Some(quote_spanned! {field.original.span()=>
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<#ty>::json_schema(gen)
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})
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}
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(None, Style::Struct) => Some(schema_for_struct(&variant.fields, None)),
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(None, Style::Tuple) => Some(schema_for_tuple_struct(&variant.fields)),
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};
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let (add_content_property, add_content_required) = content_schema
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.map(|content_schema| {
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(
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quote!(props.insert(#content_name.to_owned(), #content_schema);),
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quote!(required.insert(#content_name.to_owned());),
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)
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})
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.unwrap_or_default();
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let name = variant.name();
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let tag_schema = wrap_schema_fields(quote! {
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instance_type: Some(schemars::schema::InstanceType::String.into()),
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enum_values: Some(vec![#name.into()]),
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});
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let outer_schema = wrap_schema_fields(quote! {
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instance_type: Some(schemars::schema::InstanceType::Object.into()),
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object: Some(Box::new(schemars::schema::ObjectValidation {
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properties: {
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let mut props = schemars::Map::new();
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props.insert(#tag_name.to_owned(), #tag_schema);
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#add_content_property
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props
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},
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required: {
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let mut required = schemars::Set::new();
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required.insert(#tag_name.to_owned());
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#add_content_required
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required
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},
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..Default::default()
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})),
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});
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let doc_metadata = SchemaMetadata::from_doc_attrs(&variant.original.attrs);
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doc_metadata.apply_to_schema(outer_schema)
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});
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wrap_schema_fields(quote! {
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subschemas: Some(Box::new(schemars::schema::SubschemaValidation {
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any_of: Some(vec![#(#schemas),*]),
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..Default::default()
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})),
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})
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}
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fn schema_for_unit_struct() -> TokenStream {
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quote! {
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gen.subschema_for::<()>()
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}
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}
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fn schema_for_newtype_struct(field: &Field) -> TokenStream {
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let ty = get_json_schema_type(field);
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quote_spanned! {field.original.span()=>
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gen.subschema_for::<#ty>()
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}
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}
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fn schema_for_tuple_struct(fields: &[Field]) -> TokenStream {
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let types = fields
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.iter()
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.filter(|f| !f.serde_attrs.skip_deserializing())
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.map(get_json_schema_type);
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quote! {
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gen.subschema_for::<(#(#types),*)>()
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}
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}
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fn schema_for_struct(fields: &[Field], cattrs: Option<&serde_attr::Container>) -> TokenStream {
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let (flattened_fields, property_fields): (Vec<_>, Vec<_>) = fields
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.iter()
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.filter(|f| !f.serde_attrs.skip_deserializing() || !f.serde_attrs.skip_serializing())
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.partition(|f| f.serde_attrs.flatten());
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let set_container_default = match cattrs.map_or(&SerdeDefault::None, |c| c.default()) {
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SerdeDefault::None => None,
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SerdeDefault::Default => Some(quote!(let container_default = Self::default();)),
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SerdeDefault::Path(path) => Some(quote!(let container_default = #path();)),
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};
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let properties = property_fields.iter().map(|field| {
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let name = field.name();
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let default = field_default_expr(field, set_container_default.is_some());
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let required = match default {
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Some(_) => quote!(false),
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None => quote!(true),
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};
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let metadata = &SchemaMetadata {
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read_only: field.serde_attrs.skip_deserializing(),
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write_only: field.serde_attrs.skip_serializing(),
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default,
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..SchemaMetadata::from_doc_attrs(&field.original.attrs)
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};
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let ty = get_json_schema_type(field);
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let span = field.original.span();
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quote_spanned! {span=>
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<#ty>::add_schema_as_property(gen, &mut schema_object, #name.to_owned(), #metadata, #required);
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}
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});
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let flattens = flattened_fields.iter().map(|field| {
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let ty = get_json_schema_type(field);
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let span = field.original.span();
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quote_spanned! {span=>
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.flatten(<#ty>::json_schema_for_flatten(gen))
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}
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});
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quote! {
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{
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#set_container_default
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let mut schema_object = schemars::schema::SchemaObject {
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instance_type: Some(schemars::schema::InstanceType::Object.into()),
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..Default::default()
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};
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#(#properties)*
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schemars::schema::Schema::Object(schema_object)
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#(#flattens)*
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}
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}
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}
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fn field_default_expr(field: &Field, container_has_default: bool) -> Option<TokenStream> {
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let field_default = field.serde_attrs.default();
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if field.serde_attrs.skip_serializing() || (field_default.is_none() && !container_has_default) {
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return None;
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}
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let ty = field.ty;
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let default_expr = match field_default {
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SerdeDefault::None => {
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let member = &field.member;
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quote!(container_default.#member)
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}
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SerdeDefault::Default => quote!(<#ty>::default()),
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SerdeDefault::Path(path) => quote!(#path()),
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};
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let default_expr = match field.serde_attrs.skip_serializing_if() {
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Some(skip_if) => {
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quote! {
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{
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let default = #default_expr;
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if #skip_if(&default) {
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None
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} else {
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Some(default)
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}
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}
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}
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}
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None => quote!(Some(#default_expr)),
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};
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Some(if let Some(ser_with) = field.serde_attrs.serialize_with() {
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quote! {
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{
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struct _SchemarsDefaultSerialize<T>(T);
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impl serde::Serialize for _SchemarsDefaultSerialize<#ty>
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{
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: serde::Serializer
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{
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#ser_with(&self.0, serializer)
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}
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}
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#default_expr.map(|d| _SchemarsDefaultSerialize(d))
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}
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}
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} else {
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default_expr
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})
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}
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fn get_json_schema_type(field: &Field) -> TokenStream {
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// TODO support [schemars(schema_with= "...")] or equivalent
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field
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.with
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.as_ref()
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.map_or_else(|| field.ty.to_token_stream(), |w| w.to_token_stream())
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}
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