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use proc_macro2::{Ident, TokenStream};
use syn::punctuated::Punctuated;
use syn::token::{Colon, Gt, Lt, Paren, RArrow};
use syn::{
AngleBracketedGenericArguments,
Attribute,
FnArg,
GenericArgument,
GenericParam,
Generics,
Pat,
PatType,
Path,
PathArguments,
PathSegment,
Signature,
Type,
TypePath,
};
pub fn create_path(segments: &[PathSegment]) -> Path
{
Path {
leading_colon: None,
segments: segments.iter().cloned().collect(),
}
}
pub fn create_path_segment(ident: Ident, generic_arg_types: &[Type]) -> PathSegment
{
PathSegment {
ident,
arguments: if generic_arg_types.is_empty() {
PathArguments::None
} else {
PathArguments::AngleBracketed(AngleBracketedGenericArguments {
colon2_token: None,
lt_token: Lt::default(),
args: generic_arg_types
.iter()
.map(|generic_arg_type| {
GenericArgument::Type(generic_arg_type.clone())
})
.collect(),
gt_token: Gt::default(),
})
},
}
}
pub fn create_type(path: Path) -> Type
{
Type::Path(TypePath { qself: None, path })
}
pub fn create_generics<Params>(params: Params) -> Generics
where
Params: IntoIterator<Item = GenericParam>,
{
Generics {
lt_token: None,
params: Punctuated::from_iter(params),
gt_token: None,
where_clause: None,
}
}
pub fn create_signature<ArgTypes>(
ident: Ident,
arg_types: ArgTypes,
return_type: Type,
) -> Signature
where
ArgTypes: IntoIterator<Item = (Type, Vec<Attribute>)>,
{
Signature {
constness: None,
asyncness: None,
unsafety: None,
abi: None,
fn_token: syn::token::Fn::default(),
ident,
generics: create_generics(vec![]),
paren_token: Paren::default(),
inputs: arg_types
.into_iter()
.map(|(arg_type, attrs)| {
FnArg::Typed(PatType {
attrs,
pat: Box::new(Pat::Verbatim(TokenStream::new())),
colon_token: Colon::default(),
ty: Box::new(arg_type),
})
})
.collect(),
variadic: None,
output: syn::ReturnType::Type(RArrow::default(), Box::new(return_type)),
}
}
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