93 lines
3.1 KiB
Rust
93 lines
3.1 KiB
Rust
use proc_macro2::TokenStream;
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use syn::spanned::Spanned;
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#[derive(Debug, Clone)]
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pub struct SchemaMetadata<'a> {
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pub title: Option<&'a str>,
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pub description: Option<&'a str>,
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pub deprecated: bool,
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pub read_only: bool,
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pub write_only: bool,
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pub examples: &'a [syn::Path],
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pub default: Option<TokenStream>,
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pub extensions: &'a [(String, TokenStream)],
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pub transforms: &'a [syn::Expr],
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}
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impl<'a> SchemaMetadata<'a> {
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pub fn apply_to_schema(&self, schema_expr: &mut TokenStream) {
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let setters = self.make_setters();
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if !setters.is_empty() || !self.transforms.is_empty() {
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let apply_transforms = self.transforms.iter().map(|t| {
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quote_spanned! {t.span()=>
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schemars::transform::Transform::transform(&mut #t, &mut schema);
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}
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});
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*schema_expr = quote! {{
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let mut schema = #schema_expr;
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#(#setters)*
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#(#apply_transforms)*
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schema
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}}
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}
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}
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fn make_setters(&self) -> Vec<TokenStream> {
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let mut setters = Vec::<TokenStream>::new();
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if let Some(title) = &self.title {
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setters.push(quote! {
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schemars::_private::insert_metadata_property(&mut schema, "title", #title);
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});
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}
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if let Some(description) = &self.description {
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setters.push(quote! {
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schemars::_private::insert_metadata_property(&mut schema, "description", #description);
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});
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}
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if self.deprecated {
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setters.push(quote! {
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schemars::_private::insert_metadata_property(&mut schema, "deprecated", true);
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});
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}
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if self.read_only {
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setters.push(quote! {
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schemars::_private::insert_metadata_property(&mut schema, "readOnly", true);
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});
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}
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if self.write_only {
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setters.push(quote! {
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schemars::_private::insert_metadata_property(&mut schema, "writeOnly", true);
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});
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}
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if !self.examples.is_empty() {
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let examples = self.examples.iter().map(|eg| {
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quote! {
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schemars::_serde_json::value::to_value(#eg())
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}
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});
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setters.push(quote! {
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schemars::_private::insert_metadata_property(&mut schema, "examples", schemars::_serde_json::Value::Array([#(#examples),*].into_iter().flatten().collect()));
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});
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}
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if let Some(default) = &self.default {
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setters.push(quote! {
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if let Some(default) = #default.and_then(|d| schemars::_schemars_maybe_to_value!(d)) {
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schemars::_private::insert_metadata_property(&mut schema, "default", default);
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}
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});
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}
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for (k, v) in self.extensions {
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setters.push(quote! {
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schemars::_private::insert_metadata_property(&mut schema, #k, schemars::_serde_json::json!(#v));
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});
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}
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setters
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}
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}
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