383 lines
13 KiB
Rust
383 lines
13 KiB
Rust
use crate::{ast::*, attr::WithAttr, metadata::SchemaMetadata};
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use proc_macro2::TokenStream;
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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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pub fn expr_for_container(cont: &Container) -> TokenStream {
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let schema_expr = match &cont.data {
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Data::Struct(Style::Unit, _) => expr_for_unit_struct(),
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Data::Struct(Style::Newtype, fields) => expr_for_newtype_struct(&fields[0]),
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Data::Struct(Style::Tuple, fields) => expr_for_tuple_struct(fields),
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Data::Struct(Style::Struct, fields) => expr_for_struct(fields, Some(&cont.serde_attrs)),
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Data::Enum(variants) => expr_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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doc_metadata.apply_to_schema(schema_expr)
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}
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fn expr_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 => expr_for_external_tagged_enum(variants),
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TagType::None => expr_for_untagged_enum(variants),
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TagType::Internal { tag } => expr_for_internal_tagged_enum(variants, tag),
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TagType::Adjacent { tag, content } => expr_for_adjacent_tagged_enum(variants, tag, content),
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}
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}
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fn expr_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| v.is_unit() && v.attrs.with.is_none());
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let unit_names = unit_variants.iter().map(|v| v.name());
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let unit_schema = schema_object(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_variants.len() > 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 = expr_for_untagged_enum_variant(variant);
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let schema_expr = schema_object(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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schema_object(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 expr_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 variant_schemas = variants.map(|variant| {
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let name = variant.name();
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let type_schema = schema_object(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 = schema_object(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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match expr_for_untagged_enum_variant_for_flatten(&variant) {
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Some(variant_schema) => quote! {
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#tag_schema.flatten(#variant_schema)
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},
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None => tag_schema,
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}
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});
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schema_object(quote! {
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subschemas: Some(Box::new(schemars::schema::SubschemaValidation {
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any_of: Some(vec![#(#variant_schemas),*]),
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..Default::default()
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})),
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})
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}
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fn expr_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 = expr_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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schema_object(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 expr_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 = if variant.is_unit() && variant.attrs.with.is_none() {
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None
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} else {
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Some(expr_for_untagged_enum_variant(variant))
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};
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let (add_content_to_props, add_content_to_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 = schema_object(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 = schema_object(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_to_props
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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_to_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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schema_object(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 expr_for_untagged_enum_variant(variant: &Variant) -> TokenStream {
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if let Some(WithAttr::Type(with)) = &variant.attrs.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 => expr_for_unit_struct(),
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Style::Newtype => expr_for_newtype_struct(&variant.fields[0]),
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Style::Tuple => expr_for_tuple_struct(&variant.fields),
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Style::Struct => expr_for_struct(&variant.fields, None),
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}
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}
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fn expr_for_untagged_enum_variant_for_flatten(variant: &Variant) -> Option<TokenStream> {
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if let Some(WithAttr::Type(with)) = &variant.attrs.with {
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return Some(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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Some(match variant.style {
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Style::Unit => return None,
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Style::Newtype => {
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let field = &variant.fields[0];
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let ty = field.type_for_schema();
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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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Style::Tuple => expr_for_tuple_struct(&variant.fields),
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Style::Struct => expr_for_struct(&variant.fields, None),
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})
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}
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fn expr_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 expr_for_newtype_struct(field: &Field) -> TokenStream {
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let ty = field.type_for_schema();
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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 expr_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(Field::type_for_schema);
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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 expr_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 = cattrs.and_then(|c| match 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 = field.type_for_schema();
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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 = field.type_for_schema();
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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 schema_object(properties: 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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#properties
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..Default::default()
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})
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}
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}
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