2020-03-01 10:54:34 +00:00
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use crate::args;
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2020-03-04 02:38:07 +00:00
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use crate::utils::{build_value_repr, get_crate_name};
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2020-03-09 12:00:57 +00:00
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use inflector::Inflector;
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2020-03-01 10:54:34 +00:00
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use proc_macro::TokenStream;
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use quote::quote;
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2020-03-01 13:35:39 +00:00
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use syn::{Data, DeriveInput, Error, Result};
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2020-03-01 10:54:34 +00:00
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2020-03-03 03:48:00 +00:00
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pub fn generate(object_args: &args::InputObject, input: &DeriveInput) -> Result<TokenStream> {
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2020-03-02 00:24:49 +00:00
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let crate_name = get_crate_name(object_args.internal);
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2020-03-01 10:54:34 +00:00
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let ident = &input.ident;
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2020-03-03 03:48:00 +00:00
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let attrs = &input.attrs;
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let vis = &input.vis;
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2020-03-01 10:54:34 +00:00
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let s = match &input.data {
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Data::Struct(s) => s,
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_ => return Err(Error::new_spanned(input, "It should be a struct.")),
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};
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2020-03-03 03:48:00 +00:00
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let mut struct_fields = Vec::new();
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for field in &s.fields {
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let vis = &field.vis;
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let ty = &field.ty;
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let ident = &field.ident;
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struct_fields.push(quote! {
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#vis #ident: #ty
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});
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}
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let new_struct = quote! {
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#(#attrs)*
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#vis struct #ident {
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#(#struct_fields),*
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}
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};
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2020-03-01 10:54:34 +00:00
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let gql_typename = object_args
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.name
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.clone()
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.unwrap_or_else(|| ident.to_string());
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2020-03-03 11:15:18 +00:00
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let desc = object_args
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.desc
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.as_ref()
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.map(|s| quote! {Some(#s)})
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.unwrap_or_else(|| quote! {None});
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2020-03-01 10:54:34 +00:00
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2020-03-01 13:35:39 +00:00
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let mut get_fields = Vec::new();
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let mut fields = Vec::new();
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2020-03-03 03:48:00 +00:00
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let mut schema_fields = Vec::new();
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2020-03-01 16:52:05 +00:00
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2020-03-01 10:54:34 +00:00
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for field in &s.fields {
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2020-03-01 13:35:39 +00:00
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let field_args = args::InputField::parse(&field.attrs)?;
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2020-03-01 10:54:34 +00:00
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let ident = field.ident.as_ref().unwrap();
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2020-03-01 13:35:39 +00:00
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let ty = &field.ty;
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2020-03-09 12:00:57 +00:00
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let name = field_args
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.name
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.unwrap_or_else(|| ident.to_string().to_camel_case());
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2020-03-03 03:48:00 +00:00
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let desc = field_args
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.desc
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.as_ref()
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.map(|s| quote! {Some(#s)})
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.unwrap_or_else(|| quote! {None});
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let default = field_args
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.default
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.as_ref()
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.map(|v| {
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let s = v.to_string();
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quote! {Some(#s)}
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})
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.unwrap_or_else(|| quote! {None});
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2020-03-04 02:38:07 +00:00
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if let Some(default) = &field_args.default {
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let default_repr = build_value_repr(&crate_name, default);
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get_fields.push(quote! {
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let #ident:#ty = {
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match obj.get(#name) {
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Some(value) => #crate_name::GQLInputValue::parse(value)?,
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None => {
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let default = #default_repr;
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2020-03-07 12:54:03 +00:00
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#crate_name::GQLInputValue::parse(&default)?
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2020-03-04 02:38:07 +00:00
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}
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}
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};
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});
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} else {
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get_fields.push(quote! {
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let #ident:#ty = #crate_name::GQLInputValue::parse(obj.get(#name).unwrap_or(&#crate_name::Value::Null))?;
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});
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}
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2020-03-01 13:35:39 +00:00
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fields.push(ident);
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2020-03-03 03:48:00 +00:00
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schema_fields.push(quote! {
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2020-03-03 11:15:18 +00:00
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#crate_name::registry::InputValue {
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2020-03-03 03:48:00 +00:00
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name: #name,
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description: #desc,
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ty: <#ty as #crate_name::GQLType>::create_type_info(registry),
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default_value: #default,
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}
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})
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2020-03-01 10:54:34 +00:00
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}
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let expanded = quote! {
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2020-03-03 03:48:00 +00:00
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#new_struct
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2020-03-01 10:54:34 +00:00
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2020-03-02 00:24:49 +00:00
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impl #crate_name::GQLType for #ident {
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fn type_name() -> std::borrow::Cow<'static, str> {
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std::borrow::Cow::Borrowed(#gql_typename)
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2020-03-01 10:54:34 +00:00
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}
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2020-03-03 03:48:00 +00:00
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2020-03-03 11:15:18 +00:00
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fn create_type_info(registry: &mut #crate_name::registry::Registry) -> String {
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2020-03-04 06:24:44 +00:00
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registry.create_type::<Self, _>(|registry| #crate_name::registry::Type::InputObject {
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2020-03-03 11:15:18 +00:00
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name: #gql_typename,
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description: #desc,
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input_fields: vec![#(#schema_fields),*]
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2020-03-03 03:48:00 +00:00
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})
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}
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2020-03-01 10:54:34 +00:00
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}
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2020-03-02 00:24:49 +00:00
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impl #crate_name::GQLInputValue for #ident {
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2020-03-04 02:38:07 +00:00
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fn parse(value: &#crate_name::Value) -> Option<Self> {
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2020-03-02 11:25:21 +00:00
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use #crate_name::GQLType;
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2020-03-04 02:38:07 +00:00
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if let #crate_name::Value::Object(obj) = value {
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2020-03-01 13:35:39 +00:00
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#(#get_fields)*
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2020-03-03 11:15:18 +00:00
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Some(Self { #(#fields),* })
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2020-03-01 13:35:39 +00:00
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} else {
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2020-03-03 11:15:18 +00:00
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None
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2020-03-01 13:35:39 +00:00
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}
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}
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2020-03-01 10:54:34 +00:00
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}
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2020-03-01 13:35:39 +00:00
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2020-03-02 00:24:49 +00:00
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impl #crate_name::GQLInputObject for #ident {}
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2020-03-01 10:54:34 +00:00
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};
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Ok(expanded.into())
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}
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