536 lines
20 KiB
Rust
536 lines
20 KiB
Rust
use std::collections::HashSet;
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use darling::FromMeta;
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use proc_macro2::{Span, TokenStream, TokenTree};
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use proc_macro_crate::{crate_name, FoundCrate};
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use quote::quote;
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use syn::visit::Visit;
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use syn::{
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Attribute, Error, Expr, ExprPath, FnArg, Ident, ImplItemMethod, Lit, LitStr, Meta, NestedMeta,
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Pat, PatIdent, Type, TypeGroup, TypeParamBound, TypeReference,
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};
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use thiserror::Error;
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use crate::args;
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use crate::args::{Argument, Deprecation, Visible};
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#[derive(Error, Debug)]
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pub enum GeneratorError {
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#[error("{0}")]
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Syn(#[from] syn::Error),
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#[error("{0}")]
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Darling(#[from] darling::Error),
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}
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impl GeneratorError {
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pub fn write_errors(self) -> TokenStream {
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match self {
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GeneratorError::Syn(err) => err.to_compile_error(),
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GeneratorError::Darling(err) => err.write_errors(),
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}
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}
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}
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pub type GeneratorResult<T> = std::result::Result<T, GeneratorError>;
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pub fn get_crate_name(internal: bool) -> TokenStream {
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if internal {
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quote! { crate }
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} else {
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let name = match crate_name("async-graphql") {
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Ok(FoundCrate::Name(name)) => name,
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Ok(FoundCrate::Itself) | Err(_) => "async_graphql".to_string(),
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};
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TokenTree::from(Ident::new(&name, Span::call_site())).into()
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}
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}
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fn generate_nested_validator(
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crate_name: &TokenStream,
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nested_meta: &NestedMeta,
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) -> GeneratorResult<TokenStream> {
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let mut params = Vec::new();
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match nested_meta {
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NestedMeta::Meta(Meta::List(ls)) => {
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if ls.path.is_ident("and") {
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let mut validators = Vec::new();
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for nested_meta in &ls.nested {
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validators.push(generate_nested_validator(crate_name, nested_meta)?);
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}
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Ok(validators
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.into_iter()
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.fold(None, |acc, item| match acc {
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Some(prev) => Some(quote! { #crate_name::validators::InputValueValidatorExt::and(#prev, #item) }),
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None => Some(item),
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})
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.unwrap())
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} else if ls.path.is_ident("or") {
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let mut validators = Vec::new();
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for nested_meta in &ls.nested {
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validators.push(generate_nested_validator(crate_name, nested_meta)?);
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}
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Ok(validators
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.into_iter()
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.fold(None, |acc, item| match acc {
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Some(prev) => Some(quote! { #crate_name::validators::InputValueValidatorExt::or(#prev, #item) }),
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None => Some(item),
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})
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.unwrap())
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} else if ls.path.is_ident("list") {
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if ls.nested.len() > 1 {
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return Err(Error::new_spanned(
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ls,
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"Only one validator can be wrapped with list.",
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)
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.into());
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}
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if ls.nested.is_empty() {
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return Err(
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Error::new_spanned(ls, "At least one validator must be defined").into(),
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);
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}
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let validator = generate_nested_validator(crate_name, &ls.nested[0])?;
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Ok(quote! {
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#crate_name::validators::List(#validator)
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})
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} else {
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let ty = &ls.path;
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for item in &ls.nested {
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if let NestedMeta::Meta(Meta::NameValue(nv)) = item {
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let name = &nv.path;
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if let Lit::Str(value) = &nv.lit {
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let expr = syn::parse_str::<Expr>(&value.value())?;
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params.push(quote! { #name: (#expr).into() });
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} else {
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return Err(Error::new_spanned(
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&nv.lit,
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"Value must be string literal",
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)
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.into());
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}
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} else {
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return Err(Error::new_spanned(
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nested_meta,
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"Invalid property for validator",
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)
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.into());
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}
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}
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Ok(quote! { #ty { #(#params),* } })
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}
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}
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NestedMeta::Meta(Meta::Path(ty)) => Ok(quote! { #ty {} }),
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NestedMeta::Meta(Meta::NameValue(_)) | NestedMeta::Lit(_) => {
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Err(Error::new_spanned(nested_meta, "Invalid validator").into())
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}
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}
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}
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pub fn generate_validator(crate_name: &TokenStream, args: &Meta) -> GeneratorResult<TokenStream> {
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match args {
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Meta::List(args) => {
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if args.nested.len() > 1 {
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return Err(Error::new_spanned(args, "Only one validator can be defined. You can connect combine validators with `and` or `or`").into());
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}
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if args.nested.is_empty() {
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return Err(
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Error::new_spanned(args, "At least one validator must be defined").into(),
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);
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}
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let validator = generate_nested_validator(crate_name, &args.nested[0])?;
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Ok(quote! { ::std::sync::Arc::new(#validator) })
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}
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_ => Err(Error::new_spanned(args, "Invalid validator").into()),
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}
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}
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pub fn generate_guards(
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crate_name: &TokenStream,
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args: &Meta,
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) -> GeneratorResult<Option<TokenStream>> {
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match args {
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Meta::List(args) => match args.path.get_ident().map(ToString::to_string) {
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Some(ident) if ident == "guard" => {
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if args.nested.len() != 1 {
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return Err(Error::new_spanned(
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args,
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"Chained rules isn't possible anymore, please use operators.",
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)
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.into());
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}
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if let NestedMeta::Meta(rule) = &args.nested[0] {
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generate_guards(crate_name, rule)
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} else {
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Err(Error::new_spanned(&args.nested[0], "Invalid rule.").into())
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}
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}
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Some(ident) if ident == "and" => {
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if args.nested.len() != 2 {
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return Err(
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Error::new_spanned(args, "and operator support only 2 operands.").into(),
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);
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}
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let first_rule: Option<TokenStream>;
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let second_rule: Option<TokenStream>;
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if let NestedMeta::Meta(rule) = &args.nested[0] {
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first_rule = generate_guards(crate_name, rule)?;
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} else {
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return Err(Error::new_spanned(&args.nested[0], "Invalid rule.").into());
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}
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if let NestedMeta::Meta(rule) = &args.nested[1] {
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second_rule = generate_guards(crate_name, rule)?;
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} else {
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return Err(Error::new_spanned(&args.nested[1], "Invalid rule.").into());
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}
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Ok(Some(
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quote! { #crate_name::guard::GuardExt::and(#first_rule, #second_rule) },
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))
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}
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Some(ident) if ident == "or" => {
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if args.nested.len() != 2 {
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return Err(
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Error::new_spanned(args, "or operator support only 2 operands.").into(),
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);
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}
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let first_rule: Option<TokenStream>;
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let second_rule: Option<TokenStream>;
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if let NestedMeta::Meta(rule) = &args.nested[0] {
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first_rule = generate_guards(crate_name, rule)?;
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} else {
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return Err(Error::new_spanned(&args.nested[0], "Invalid rule.").into());
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}
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if let NestedMeta::Meta(rule) = &args.nested[1] {
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second_rule = generate_guards(crate_name, rule)?;
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} else {
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return Err(Error::new_spanned(&args.nested[1], "Invalid rule.").into());
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}
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Ok(Some(
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quote! { #crate_name::guard::GuardExt::or(#first_rule, #second_rule) },
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))
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}
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Some(ident) if ident == "chain" => {
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if args.nested.len() < 2 {
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return Err(Error::new_spanned(
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args,
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"chain operator need at least 1 operand.",
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)
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.into());
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}
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let mut guards: Option<TokenStream> = None;
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for arg in &args.nested {
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if let NestedMeta::Meta(rule) = &arg {
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let guard = generate_guards(crate_name, rule)?;
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if guards.is_none() {
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guards = guard;
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} else {
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guards =
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Some(quote! { #crate_name::guard::GuardExt::and(#guards, #guard) });
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}
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}
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}
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Ok(guards)
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}
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Some(ident) if ident == "race" => {
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if args.nested.len() < 2 {
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return Err(
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Error::new_spanned(args, "race operator need at least 1 operand.").into(),
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);
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}
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let mut guards: Option<TokenStream> = None;
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for arg in &args.nested {
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if let NestedMeta::Meta(rule) = &arg {
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let guard = generate_guards(crate_name, rule)?;
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if guards.is_none() {
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guards = guard;
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} else {
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guards =
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Some(quote! { #crate_name::guard::GuardExt::or(#guards, #guard) });
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}
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}
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}
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Ok(guards)
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}
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_ => {
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let ty = &args.path;
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let mut params = Vec::new();
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for attr in &args.nested {
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if let NestedMeta::Meta(Meta::NameValue(nv)) = attr {
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let name = &nv.path;
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if let Lit::Str(value) = &nv.lit {
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let value_str = value.value();
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if let Some(value_str) = value_str.strip_prefix('@') {
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let getter_name = get_param_getter_ident(value_str);
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params.push(quote! { #name: #getter_name()? });
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} else {
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let expr = syn::parse_str::<Expr>(&value_str)?;
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params.push(quote! { #name: (#expr).into() });
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}
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} else {
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return Err(Error::new_spanned(
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&nv.lit,
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"Value must be string literal",
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)
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.into());
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}
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} else {
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return Err(Error::new_spanned(attr, "Invalid property for guard").into());
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}
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}
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Ok(Some(quote! { #ty { #(#params),* } }))
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}
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},
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_ => Err(Error::new_spanned(args, "Invalid guards").into()),
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}
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}
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pub fn get_rustdoc(attrs: &[Attribute]) -> GeneratorResult<Option<String>> {
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let mut full_docs = String::new();
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for attr in attrs {
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match attr.parse_meta()? {
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Meta::NameValue(nv) if nv.path.is_ident("doc") => {
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if let Lit::Str(doc) = nv.lit {
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let doc = doc.value();
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let doc_str = doc.trim();
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if !full_docs.is_empty() {
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full_docs += "\n";
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}
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full_docs += doc_str;
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}
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}
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_ => {}
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}
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}
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Ok(if full_docs.is_empty() {
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None
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} else {
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Some(full_docs)
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})
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}
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fn generate_default_value(lit: &Lit) -> GeneratorResult<TokenStream> {
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match lit {
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Lit::Str(value) =>{
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let value = value.value();
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Ok(quote!({ ::std::borrow::ToOwned::to_owned(#value) }))
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}
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Lit::Int(value) => {
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let value = value.base10_parse::<i32>()?;
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Ok(quote!({ ::std::convert::TryInto::try_into(#value).unwrap() }))
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}
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Lit::Float(value) => {
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let value = value.base10_parse::<f64>()?;
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Ok(quote!({ ::std::convert::TryInto::try_into(#value) }))
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}
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Lit::Bool(value) => {
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let value = value.value;
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Ok(quote!({ #value }))
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}
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_ => Err(Error::new_spanned(
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lit,
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"The default value type only be string, integer, float and boolean, other types should use default_with",
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).into()),
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}
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}
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fn generate_default_with(lit: &LitStr) -> GeneratorResult<TokenStream> {
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let str = lit.value();
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let tokens: TokenStream = str
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.parse()
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.map_err(|err| GeneratorError::Syn(syn::Error::from(err)))?;
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Ok(quote! { (#tokens) })
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}
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pub fn generate_default(
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default: &Option<args::DefaultValue>,
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default_with: &Option<LitStr>,
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) -> GeneratorResult<Option<TokenStream>> {
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match (default, default_with) {
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(Some(args::DefaultValue::Default), _) => {
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Ok(Some(quote! { ::std::default::Default::default() }))
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}
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(Some(args::DefaultValue::Value(lit)), _) => Ok(Some(generate_default_value(lit)?)),
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(None, Some(lit)) => Ok(Some(generate_default_with(lit)?)),
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(None, None) => Ok(None),
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}
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}
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pub fn get_param_getter_ident(name: &str) -> Ident {
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Ident::new(&format!("__{}_getter", name), Span::call_site())
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}
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pub fn get_cfg_attrs(attrs: &[Attribute]) -> Vec<Attribute> {
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attrs
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.iter()
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.filter(|attr| !attr.path.segments.is_empty() && attr.path.segments[0].ident == "cfg")
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.cloned()
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.collect()
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}
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pub fn parse_graphql_attrs<T: FromMeta>(attrs: &[Attribute]) -> GeneratorResult<Option<T>> {
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for attr in attrs {
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if attr.path.is_ident("graphql") {
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let meta = attr.parse_meta()?;
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return Ok(Some(T::from_meta(&meta)?));
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}
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}
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Ok(None)
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}
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pub fn remove_graphql_attrs(attrs: &mut Vec<Attribute>) {
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if let Some((idx, _)) = attrs
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.iter()
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.enumerate()
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.find(|(_, a)| a.path.is_ident("graphql"))
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{
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attrs.remove(idx);
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}
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}
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pub fn get_type_path_and_name(ty: &Type) -> GeneratorResult<(&Type, String)> {
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match ty {
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Type::Path(path) => Ok((
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ty,
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path.path
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.segments
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.last()
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.map(|s| s.ident.to_string())
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.unwrap(),
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)),
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Type::Group(TypeGroup { elem, .. }) => get_type_path_and_name(elem),
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Type::TraitObject(trait_object) => Ok((
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ty,
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trait_object
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.bounds
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.iter()
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.find_map(|bound| match bound {
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TypeParamBound::Trait(t) => {
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Some(t.path.segments.last().map(|s| s.ident.to_string()).unwrap())
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}
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_ => None,
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})
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.unwrap(),
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)),
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_ => Err(Error::new_spanned(ty, "Invalid type").into()),
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}
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}
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pub fn visible_fn(visible: &Option<Visible>) -> TokenStream {
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match visible {
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None | Some(Visible::None) => quote! { ::std::option::Option::None },
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Some(Visible::HiddenAlways) => quote! { ::std::option::Option::Some(|_| false) },
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Some(Visible::FnName(name)) => {
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quote! { ::std::option::Option::Some(#name) }
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}
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}
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}
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pub fn parse_complexity_expr(s: &str) -> GeneratorResult<(HashSet<String>, Expr)> {
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#[derive(Default)]
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struct VisitComplexityExpr {
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variables: HashSet<String>,
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}
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impl<'a> Visit<'a> for VisitComplexityExpr {
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fn visit_expr_path(&mut self, i: &'a ExprPath) {
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if let Some(ident) = i.path.get_ident() {
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if ident != "child_complexity" {
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self.variables.insert(ident.to_string());
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}
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}
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}
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}
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let expr: Expr = syn::parse_str(s)?;
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let mut visit = VisitComplexityExpr::default();
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visit.visit_expr(&expr);
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Ok((visit.variables, expr))
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}
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pub fn gen_deprecation(deprecation: &Deprecation, crate_name: &TokenStream) -> TokenStream {
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match deprecation {
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Deprecation::NoDeprecated => {
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quote! { #crate_name::registry::Deprecation::NoDeprecated }
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}
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Deprecation::Deprecated {
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reason: Some(reason),
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} => {
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quote! { #crate_name::registry::Deprecation::Deprecated { reason: ::std::option::Option::Some(#reason) } }
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}
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Deprecation::Deprecated { reason: None } => {
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quote! { #crate_name::registry::Deprecation::Deprecated { reason: ::std::option::Option::None } }
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}
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}
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}
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pub fn extract_input_args(
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crate_name: &proc_macro2::TokenStream,
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method: &mut ImplItemMethod,
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) -> GeneratorResult<Vec<(PatIdent, Type, Argument)>> {
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let mut args = Vec::new();
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let mut create_ctx = true;
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if method.sig.inputs.is_empty() {
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return Err(Error::new_spanned(
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&method.sig,
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"The self receiver must be the first parameter.",
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)
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.into());
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}
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for (idx, arg) in method.sig.inputs.iter_mut().enumerate() {
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if let FnArg::Receiver(receiver) = arg {
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if idx != 0 {
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return Err(Error::new_spanned(
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receiver,
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"The self receiver must be the first parameter.",
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)
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.into());
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}
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} else if let FnArg::Typed(pat) = arg {
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if idx == 0 {
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return Err(Error::new_spanned(
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pat,
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"The self receiver must be the first parameter.",
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)
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.into());
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}
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|
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match (&*pat.pat, &*pat.ty) {
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(Pat::Ident(arg_ident), Type::Reference(TypeReference { elem, .. })) => {
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if let Type::Path(path) = elem.as_ref() {
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if idx != 1 || path.path.segments.last().unwrap().ident != "Context" {
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args.push((
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arg_ident.clone(),
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|
pat.ty.as_ref().clone(),
|
|
parse_graphql_attrs::<args::Argument>(&pat.attrs)?
|
|
.unwrap_or_default(),
|
|
));
|
|
} else {
|
|
create_ctx = false;
|
|
}
|
|
}
|
|
}
|
|
(Pat::Ident(arg_ident), ty) => {
|
|
args.push((
|
|
arg_ident.clone(),
|
|
ty.clone(),
|
|
parse_graphql_attrs::<args::Argument>(&pat.attrs)?.unwrap_or_default(),
|
|
));
|
|
remove_graphql_attrs(&mut pat.attrs);
|
|
}
|
|
_ => {
|
|
return Err(Error::new_spanned(arg, "Invalid argument type.").into());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if create_ctx {
|
|
let arg = syn::parse2::<FnArg>(quote! { _: &#crate_name::Context<'_> }).unwrap();
|
|
method.sig.inputs.insert(1, arg);
|
|
}
|
|
|
|
Ok(args)
|
|
}
|