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use crate::parser;
use crate::{Program, Rpc, RpcArg, State, StateRpc};
pub fn parse(program_mod: syn::ItemMod) -> Program {
let mod_ident = &program_mod.ident;
let mod_content = &program_mod.content.as_ref().unwrap().1;
let state: Option<State> = {
let strct: Option<&syn::ItemStruct> = mod_content
.iter()
.filter_map(|item| match item {
syn::Item::Struct(item_strct) => {
let attrs = &item_strct.attrs;
if attrs.is_empty() {
return None;
}
let attr_label = attrs[0].path.get_ident().map(|i| i.to_string());
if attr_label != Some("state".to_string()) {
return None;
}
Some(item_strct)
}
_ => None,
})
.next();
let impl_block: Option<&syn::ItemImpl> = strct.map(|strct| {
let item_impl = mod_content
.iter()
.filter_map(|item| match item {
syn::Item::Impl(item_impl) => {
let impl_ty_str = parser::tts_to_string(&item_impl.self_ty);
let strct_name = strct.ident.to_string();
if strct_name != impl_ty_str {
return None;
}
Some(item_impl)
}
_ => None,
})
.next()
.expect("Must provide an implementation");
item_impl
});
strct.map(|strct| {
let mut strct = strct.clone();
strct.attrs = vec![];
let impl_block = impl_block.expect("Must exist if struct exists").clone();
let (ctor, ctor_anchor) = impl_block
.items
.iter()
.filter_map(|item: &syn::ImplItem| match item {
syn::ImplItem::Method(m) => {
if m.sig.ident.to_string() == "new" {
let ctx_arg = m.sig.inputs.first().unwrap();
match ctx_arg {
syn::FnArg::Receiver(_) => panic!("invalid syntax"),
syn::FnArg::Typed(arg) => {
Some((m.clone(), extract_ident(&arg).clone()))
}
}
} else {
None
}
}
_ => None,
})
.next()
.expect("Must exist if struct exists")
.clone();
let methods: Vec<StateRpc> = impl_block
.items
.iter()
.filter_map(|item: &syn::ImplItem| match item {
syn::ImplItem::Method(m) => match m.sig.inputs.first() {
None => None,
Some(arg) => match arg {
syn::FnArg::Typed(_) => None,
syn::FnArg::Receiver(_) => {
let mut args = m
.sig
.inputs
.iter()
.filter_map(|arg| match arg {
syn::FnArg::Receiver(_) => None,
syn::FnArg::Typed(arg) => Some(arg),
})
.map(|raw_arg| {
let ident = match &*raw_arg.pat {
syn::Pat::Ident(ident) => &ident.ident,
_ => panic!("invalid syntax"),
};
RpcArg {
name: ident.clone(),
raw_arg: raw_arg.clone(),
}
})
.collect::<Vec<RpcArg>>();
let anchor = args.remove(0);
let anchor_ident = extract_ident(&anchor.raw_arg).clone();
Some(StateRpc {
raw_method: m.clone(),
ident: m.sig.ident.clone(),
args,
anchor_ident,
})
}
},
},
_ => None,
})
.collect();
State {
name: strct.ident.to_string(),
strct: strct.clone(),
impl_block,
ctor,
ctor_anchor,
methods,
}
})
};
let methods: Vec<&syn::ItemFn> = mod_content
.iter()
.filter_map(|item| match item {
syn::Item::Fn(item_fn) => Some(item_fn),
_ => None,
})
.collect();
let rpcs: Vec<Rpc> = methods
.clone()
.into_iter()
.map(|method: &syn::ItemFn| {
let mut args: Vec<RpcArg> = method
.sig
.inputs
.iter()
.map(|arg: &syn::FnArg| match arg {
syn::FnArg::Typed(arg) => {
let ident = match &*arg.pat {
syn::Pat::Ident(ident) => &ident.ident,
_ => panic!("invalid syntax"),
};
RpcArg {
name: ident.clone(),
raw_arg: arg.clone(),
}
}
_ => panic!("invalid syntax"),
})
.collect();
let anchor = args.remove(0);
let anchor_ident = extract_ident(&anchor.raw_arg).clone();
Rpc {
raw_method: method.clone(),
ident: method.sig.ident.clone(),
args,
anchor_ident,
}
})
.collect();
Program {
state,
rpcs,
name: mod_ident.clone(),
program_mod,
}
}
fn extract_ident(path_ty: &syn::PatType) -> &proc_macro2::Ident {
let p = match &*path_ty.ty {
syn::Type::Path(p) => &p.path,
_ => panic!("invalid syntax"),
};
let segment = p.segments.first().unwrap();
let generic_args = match &segment.arguments {
syn::PathArguments::AngleBracketed(args) => args,
_ => panic!("invalid syntax"),
};
let generic_ty = generic_args
.args
.iter()
.filter_map(|arg| match arg {
syn::GenericArgument::Type(ty) => Some(ty),
_ => None,
})
.next()
.unwrap();
let path = match generic_ty {
syn::Type::Path(ty_path) => &ty_path.path,
_ => panic!("invalid syntax"),
};
&path.segments[0].ident
}