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use proc_macro::Span;
use quote::quote;
use syn::Ident;
#[derive(Debug, Clone)]
pub(crate) enum ValueType {
Bool,
Int,
Float,
String,
Unit,
List(Box<ValueType>),
Tuple(Vec<Box<ValueType>>),
// Fn
Struct(String),
Enum(String),
}
impl ValueType {
pub(crate) fn from_syn_type(ty: syn::Type) -> Option<ValueType> {
Some(match ty {
syn::Type::Path(ty) => {
if ty.path.get_ident().is_none() {
let ty = ty.path.segments.last().unwrap();
if ty.ident != "Vec" {
if crate::EXPORT_STRUCTS
.lock()
.unwrap()
.contains_key(&ty.ident.to_string())
{
return Some(ValueType::Struct(ty.ident.to_string()));
}
if crate::EXPORT_ENUMS
.lock()
.unwrap()
.contains_key(&ty.ident.to_string())
{
return Some(ValueType::Enum(ty.ident.to_string()));
}
return None;
}
let inner_ty = match &ty.arguments {
syn::PathArguments::AngleBracketed(
syn::AngleBracketedGenericArguments { args, .. },
) => match &args[0] {
syn::GenericArgument::Type(inner) => {
ValueType::from_syn_type(inner.clone())?
}
_ => return None,
},
_ => return None,
};
return Some(ValueType::List(Box::new(inner_ty)));
}
match ty.path.get_ident().unwrap().to_string().as_str() {
"bool" => ValueType::Bool,
"i64" => ValueType::Int,
"f64" => ValueType::Float,
"String" => ValueType::String,
ident => {
if crate::EXPORT_STRUCTS
.lock()
.unwrap()
.contains_key(&ident.to_string())
{
ValueType::Struct(ident.to_string())
} else if crate::EXPORT_ENUMS
.lock()
.unwrap()
.contains_key(&ident.to_string())
{
ValueType::Enum(ident.to_string())
} else {
return None;
}
}
}
}
syn::Type::Tuple(syn::TypeTuple { elems, .. }) => {
let mut types = Vec::new();
for ty in elems {
types.push(Box::new(ValueType::from_syn_type(ty)?));
}
ValueType::Tuple(types)
}
_ => return None,
})
}
pub(crate) fn to_ident(&self) -> Ident {
use ValueType::*;
match self {
Unit => Ident::new("Unit", Span::call_site().into()),
Bool => Ident::new("Bool", Span::call_site().into()),
Int => Ident::new("Int", Span::call_site().into()),
Float => Ident::new("Float", Span::call_site().into()),
String => Ident::new("String", Span::call_site().into()),
List(_) => Ident::new("List", Span::call_site().into()),
Tuple(_) => Ident::new("Tuple", Span::call_site().into()),
Struct(_) => Ident::new("Struct", Span::call_site().into()),
Enum(_) => Ident::new("Variant", Span::call_site().into()),
}
}
pub(crate) fn to_tokens(&self) -> proc_macro2::TokenStream {
use ValueType::*;
match self {
Unit => quote!(()),
Bool => quote!(bool),
Int => quote!(i64),
Float => quote!(f64),
String => quote!(String),
List(inner) => {
let inner_ty = inner.to_tokens();
quote!(Vec<#inner_ty>)
}
Tuple(inners) => {
let inner_tys = inners.into_iter().map(|v| v.to_tokens());
quote!((#(#inner_tys),*))
}
Struct(s) => {
let strct = Ident::new(&s, Span::call_site().into());
quote!(#strct)
}
Enum(s) => {
let enm = Ident::new(&s, Span::call_site().into());
quote!(#enm)
}
}
}
pub(crate) fn to_match_arm(&self) -> proc_macro2::TokenStream {
let head = self.to_ident();
use ValueType::*;
match self {
Unit | Bool | Int | Float | String => quote!(oters::Value::#head(v) => v),
List(ty) => {
let inner_ty = ty.to_tokens();
let inner_arm = ty.to_match_arm();
quote! {
oters::Value::#head(vs) => {
let vec: Vec<#inner_ty> = vs
.into_iter()
.map(|v| match *v {
#inner_arm,
_ => unreachable!(),
}).collect();
vec
}
}
}
Tuple(tys) => {
let indices: Vec<syn::Index> =
(0..tys.len()).map(|i| syn::Index::from(i)).collect();
let tys_arms = tys.into_iter().map(|t| t.to_match_arm());
quote! {
oters::Value::#head(vs) => (#(match *vs[#indices].clone() {
#tys_arms,
_ => unreachable!()
}),*)
}
}
Struct(name) => {
let map = crate::EXPORT_STRUCTS.lock().unwrap().clone();
let strct = map.get(name).clone();
match strct {
Some(fields) => {
let name = Ident::new(name, Span::call_site().into());
let mut field_idents = Vec::new();
let mut field_strs = Vec::new();
let mut field_arms = Vec::new();
for (field, val) in fields {
field_idents.push(Ident::new(field, Span::call_site().into()));
field_strs.push(field);
field_arms.push(val.to_match_arm());
}
quote! {
oters::Value::Struct(_, map) => #name {
#(#field_idents: match *map.get(#field_strs).unwrap().clone() {
#field_arms,
_ => unreachable!()
}),* }
}
}
None => syn::Error::new(
proc_macro::Span::call_site().into(),
format!("Struct {} has not been exported", name),
)
.to_compile_error()
.into(),
}
}
Enum(name) => {
let map = crate::EXPORT_ENUMS.lock().unwrap().clone();
let map = map.get(name).clone();
match map {
Some(variants) => {
let name = Ident::new(name, Span::call_site().into());
let mut variant_arms = Vec::new();
for (variant, opt) in variants {
let variant_ident = Ident::new(variant, Span::call_site().into());
variant_arms.push(match opt {
None => quote!(#variant => #name::#variant_ident,),
Some(val_ty) => match val_ty {
ValueType::Tuple(vals) => {
let indices: Vec<syn::Index> =
(0..vals.len()).map(|i| syn::Index::from(i)).collect();
let val_arms = vals.into_iter().map(|v_t| v_t.to_match_arm());
quote! {
#variant => match *val.unwrap() {
oters::Value::Tuple(vals) => #name::#variant_ident(#(
match *vals[#indices].clone() {
#val_arms,
_ => unreachable!(),
}
),*),
_ => unreachable!(),
},
}
}
_ => {
let val_arm = val_ty.to_match_arm();
quote! {
#variant => #name::#variant_ident(match *val.unwrap() {
#val_arm,
_ => unreachable!(),
}),
}
}
},
});
}
quote! {
oters::Value::Variant(name, val) => match name.as_str() {
#(#variant_arms)*
_ => unreachable!()
}
}
}
None => syn::Error::new(
proc_macro::Span::call_site().into(),
format!("Enum {} has not been exported", name),
)
.to_compile_error()
.into(),
}
}
}
}
pub(crate) fn to_type(&self) -> proc_macro2::TokenStream {
let path = quote!(oters::Type);
use ValueType::*;
match self {
Unit => quote!(#path::Unit),
Int => quote!(#path::Int),
Float => quote!(#path::Float),
Bool => quote!(#path::Bool),
String => quote!(#path::String),
List(t) => {
let t = t.to_type();
quote!(#path::List(::std::boxed::Box::new(#t)))
}
Tuple(ts) => {
let ts: Vec<proc_macro2::TokenStream> = ts
.into_iter()
.map(|t| {
let t = t.to_type();
quote!(::std::boxed::Box::new(#t))
})
.collect();
quote!(#path::Tuple(vec![#(#ts),*]))
}
Struct(name) => {
let map = crate::EXPORT_STRUCTS
.lock()
.unwrap()
.get(name)
.unwrap()
.clone();
let map_tokens: Vec<proc_macro2::TokenStream> = map
.into_iter()
.map(|(f, t)| {
let t = t.to_type();
quote!((#f.to_string(), ::std::boxed::Box::new(#t)))
})
.collect();
quote!(#path::Struct(::std::collections::HashMap::from([#(#map_tokens),*])))
}
Enum(name) => {
let map = crate::EXPORT_ENUMS
.lock()
.unwrap()
.get(name)
.unwrap()
.clone();
let map_tokens: Vec<proc_macro2::TokenStream> = map
.into_iter()
.map(|(v, o)| {
let t = match o {
None => quote!(None),
Some(t) => {
let t = t.to_type();
quote!(Some(::std::boxed::Box::new(#t)))
}
};
quote!((#v.to_string(), #t))
})
.collect();
quote!(#path::Enum(::std::collections::HashMap::from([#(#map_tokens),*])))
}
}
}
}