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use proc_macro2::TokenStream;
use quote::{quote, ToTokens, TokenStreamExt};
use syn::Type;
use crate::{opts::ComposableQueryReturn, query::QueryVar};
#[derive(Debug)]
pub enum SelectorValue {
SubSelector(Type),
Computed(QueryVar),
}
impl From<&ComposableQueryReturn> for SelectorValue {
fn from(cqr: &ComposableQueryReturn) -> Self {
match &cqr.var {
Some(v) => SelectorValue::Computed(v.clone()),
None => SelectorValue::SubSelector(cqr.ty.clone()),
}
}
}
#[derive(Debug)]
pub enum QuerySelector {
/// select fields from object. requires [select(object)]
/// as query return: `select obj {field, field2: ...}`
/// as subquery return: `select outerobj {thisfield {field, field2: ...}}`
Selector(String, Vec<(String, SelectorValue)>),
/// default for named-structs: select fields from object. accepts [var(...)]
/// as query return: `select {field := a, field2 := b}
/// as subquery return: `select outerobj {thisfield := {field := a, field2 := b}}`
Object(Vec<(String, QueryVar)>),
/// todo: default for tuple-structs
/// ?
// Tuple(Vec<QueryVar>),
/// requires empty struct
/// as query return: `whatever`
/// as subquery return: `select outerobj {thisfield := (whatever)}`
Direct(QueryVar, Type),
}
impl QuerySelector {
pub fn as_composable_query_result_type(&self) -> TokenStream {
match self {
QuerySelector::Selector(..) => {
quote! {::edgedb_composable_query::composable::ComposableQueryResultKind::Selector}
}
QuerySelector::Object(..) => {
quote! {::edgedb_composable_query::composable::ComposableQueryResultKind::Selector}
}
_ => {
quote! {::edgedb_composable_query::composable::ComposableQueryResultKind::Field}
}
}
}
}
/// will be code that writes to fmt
impl ToTokens for QuerySelector {
fn to_tokens(&self, tokens: &mut TokenStream) {
match self {
QuerySelector::Selector(_fr, vals) => {
let (names, vars) = vals
.iter()
.map(|(n, v)| match v {
SelectorValue::SubSelector(ty) => {
let ty = ty;
// dbg!(ty);
(
n,
quote! {{
let mut buf = String::new();
<#ty as ::edgedb_composable_query::composable::EdgedbComposableSelector>::format_subquery(&mut buf)?;
::edgedb_composable_query::__query_add_indent(&buf)
}},
)
}
SelectorValue::Computed(v) => {
(n, quote! {format!(" := ({})", #v.to_string())})
}
})
.unzip::<_, _, Vec<_>, Vec<_>>();
tokens.append_all(quote! {
fmt.write_fmt(
format_args!(
"\t{}",
[#( (#names, #vars) ),*].map(
|(n, v)| format!("{}{}", n, v)).join::<&str>(",\n\t")
)
)?;
})
}
QuerySelector::Object(mapping) => {
let mapping_tuples = mapping.iter().map(|(k, v)| {
quote! {
(#k, #v)
}
});
tokens.append_all(quote! {
fmt.write_fmt(format_args!(
"{}",
[#(#mapping_tuples),*]
.iter()
.map(|(k, v)| format!("\t{k} := ({v}),"))
.join("\n")
))?;
});
}
// QuerySelector::Tuple(vars) => {
// tokens.append_all(quote! {
// fmt.write_fmt(format_args!(
// "({})",
// [#( #vars ),*]
// .iter()
// .map(|v| format!("({})", v))
// .join(", ")
// ))?;
// });
// }
QuerySelector::Direct(_direct, ty) => {
tokens.append_all(quote! {
// fmt.write_str(
// #direct
// )?;
<#ty as ::edgedb_composable_query::composable::EdgedbComposableSelector>::format_selector( fmt)?;
});
}
};
}
}