2020-06-06 07:48:21 +00:00
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use proc_macro2::{Span, TokenStream};
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use proc_macro_crate::crate_name;
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use quote::quote;
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use syn::{Attribute, Error, Expr, Ident, Lit, Meta, MetaList, NestedMeta, Result};
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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 = crate_name("async-graphql").unwrap_or_else(|_| "async_graphql".to_owned());
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let id = Ident::new(&name, Span::call_site());
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quote! { #id }
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}
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}
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fn parse_nested_validator(
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crate_name: &TokenStream,
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nested_meta: &NestedMeta,
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) -> Result<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(parse_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(parse_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 {
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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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}
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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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}
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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"))
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}
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}
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}
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pub fn parse_validator(crate_name: &TokenStream, args: &MetaList) -> Result<TokenStream> {
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for arg in &args.nested {
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if let NestedMeta::Meta(Meta::List(ls)) = arg {
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if ls.path.is_ident("validator") {
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if ls.nested.len() > 1 {
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return Err(Error::new_spanned(ls,
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"Only one validator can be defined. You can connect combine validators with `and` or `or`"));
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}
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if ls.nested.is_empty() {
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return Err(Error::new_spanned(
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ls,
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"At least one validator must be defined",
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));
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}
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let validator = parse_nested_validator(crate_name, &ls.nested[0])?;
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return Ok(quote! { Some(std::sync::Arc::new(#validator)) });
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}
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}
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}
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Ok(quote! {None})
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}
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pub fn parse_guards(crate_name: &TokenStream, args: &MetaList) -> Result<Option<TokenStream>> {
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for arg in &args.nested {
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if let NestedMeta::Meta(Meta::List(ls)) = arg {
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if ls.path.is_ident("guard") {
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let mut guards = None;
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for item in &ls.nested {
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if let NestedMeta::Meta(Meta::List(ls)) = item {
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let ty = &ls.path;
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let mut params = Vec::new();
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for attr in &ls.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 value_str.starts_with('@') {
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let getter_name = get_param_getter_ident(&value_str[1..]);
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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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}
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} else {
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return Err(Error::new_spanned(attr, "Invalid property for guard"));
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}
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}
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let guard = quote! { #ty { #(#params),* } };
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if guards.is_none() {
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guards = Some(guard);
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} else {
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guards =
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Some(quote! { #crate_name::guard::GuardExt::and(#guard, #guards) });
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}
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} else {
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return Err(Error::new_spanned(item, "Invalid guard"));
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}
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}
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return Ok(guards);
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}
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}
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}
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Ok(None)
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}
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pub fn parse_post_guards(crate_name: &TokenStream, args: &MetaList) -> Result<Option<TokenStream>> {
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for arg in &args.nested {
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if let NestedMeta::Meta(Meta::List(ls)) = arg {
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if ls.path.is_ident("post_guard") {
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let mut guards = None;
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for item in &ls.nested {
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if let NestedMeta::Meta(Meta::List(ls)) = item {
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let ty = &ls.path;
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let mut params = Vec::new();
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for attr in &ls.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 value_str.starts_with('@') {
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let getter_name = get_param_getter_ident(&value_str[1..]);
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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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}
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} else {
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return Err(Error::new_spanned(attr, "Invalid property for guard"));
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}
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}
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let guard = quote! { #ty { #(#params),* } };
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if guards.is_none() {
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guards = Some(guard);
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} else {
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guards = Some(
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quote! { #crate_name::guard::PostGuardExt::and(#guard, #guards) },
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);
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}
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} else {
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return Err(Error::new_spanned(item, "Invalid guard"));
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}
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}
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return Ok(guards);
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}
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}
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}
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Ok(None)
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}
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pub fn get_rustdoc(attrs: &[Attribute]) -> Result<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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pub fn parse_default(lit: &Lit) -> Result<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!({ #value.to_string() }))
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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!({ #value as i32 }))
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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!({ #value as f64 }))
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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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)),
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}
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}
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pub fn parse_default_with(lit: &Lit) -> Result<TokenStream> {
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if let Lit::Str(str) = lit {
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let str = str.value();
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let tokens: TokenStream = str.parse()?;
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Ok(quote! { (#tokens) })
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} else {
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Err(Error::new_spanned(
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&lit,
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"Attribute 'default' should be a string.",
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))
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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 feature_block(
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crate_name: &TokenStream,
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features: &[String],
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field_name: &str,
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block: TokenStream,
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) -> TokenStream {
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if !features.is_empty() {
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let error_message = format!(
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"`{}` is only available if the features `{}` are enabled",
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field_name,
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features.join(",")
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);
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quote!({
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#[cfg(not(all(#(feature = #features),*)))]
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{
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return Err(#crate_name::FieldError::from(#error_message)).map_err(std::convert::Into::into);
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}
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#[cfg(all(#(feature = #features),*))]
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{
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#block
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}
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})
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} else {
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block
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}
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}
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