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extern crate proc_macro;
extern crate syn;
#[macro_use]
extern crate quote;
use proc_macro::TokenStream;
#[proc_macro_derive(TypeScriptify)]
pub fn hello_world(input: TokenStream) -> TokenStream {
// Construct a string representation of the type definition
let s = input.to_string();
// Parse the string representation
let ast = syn::parse_derive_input(&s).unwrap();
// Build the impl
let gen = impl_hello_world(&ast);
// Return the generated impl
gen.parse().unwrap()
}
fn impl_hello_world(ast: &syn::DeriveInput) -> quote::Tokens {
let name = &ast.ident;
let structname = name.to_string();
let _body = &ast.body;
let mut fieldlines : Vec<String> = vec![];
let _n = match ast.body {
syn::Body::Struct(ref data) => {
for field in data.fields() {
//field.ty; //type of the field
//field.ident; //name (tuple struct fields have none here)
//field.vis; //visibility
//field.attrs; //attributes
println!("Fieldtype = {:?} and Name = {:?}", field.ty, field.ident);
let fieldname : String = format!("{}", field.ident.clone().unwrap().to_string());
match field.ty {
syn::Ty::Array(ref _b, ref _c) => {
unimplemented!()
},
syn::Ty::Ptr(ref _p) => {
unimplemented!()
},
syn::Ty::Path(ref _qselfopt, ref path) => {
let intype = format!("{}", path.segments.last().unwrap().ident);
let generic_params_unformated = &path.segments.last().clone().unwrap().parameters;
let mut generics_parameters: Vec<String> = Vec::new();
match generic_params_unformated {
&syn::PathParameters::AngleBracketed(ref angle_bracketed_parameter_data) => {
for ty in &angle_bracketed_parameter_data.types {
match ty {
&syn::Ty::Path(ref _qotherself, ref qotherpath) => {
generics_parameters.push(format!("{}", qotherpath.segments.last().unwrap().ident));
},
_ => unimplemented!(),
}
}
},
_ => unimplemented!(),
};
//treat option special, as types in typescript are already nullable
let mtyp: String = if intype.eq("Option") {
(match generics_parameters.first().unwrap().as_ref() {
"i64" => "number",
"u32" => "number",
"u16" => "number",
"u8" => "number",
"bool" => "boolean",
"String" => "string",
"f32" => "number",
"f64" => "number",
"HashMap" => "Map",
"Vec" => "Array",
"HashSet" => "Array",
a @ _ => a,
}).to_string()
} else {
let mut generic_term_in_angle_brackets: String = if generics_parameters.is_empty() {"".to_string()} else {"<".to_string()};
for gen in &generics_parameters {
if generic_term_in_angle_brackets.len() > 1 {
generic_term_in_angle_brackets = generic_term_in_angle_brackets + ", ";
}
generic_term_in_angle_brackets = generic_term_in_angle_brackets + match gen.as_ref() {
"i64" => "number",
"u32" => "number",
"u16" => "number",
"u8" => "number",
"bool" => "boolean",
"String" => "string",
"f32" => "number",
"f64" => "number",
"HashMap" => "Map",
"Vec" => "Array",
"HashSet" => "Array",
a @ _ => a,
};
}
if !generics_parameters.is_empty() {
generic_term_in_angle_brackets = generic_term_in_angle_brackets +">";
}
(match intype.as_ref() {
"i64" => "number".to_string(),
"u32" => "number".to_string(),
"u16" => "number".to_string(),
"u8" => "number".to_string(),
"bool" => "boolean".to_string(),
"String" => "string".to_string(),
"f32" => "number".to_string(),
"f64" => "number".to_string(),
"HashMap" => "Map".to_string(),
"Vec" => "Array".to_string(),
"HashSet" => "Array".to_string(),
a @ _ => a.to_string(),
} + &generic_term_in_angle_brackets)
};
fieldlines.push(format!("{}: {};", fieldname, mtyp));
},
_ => unimplemented!(),
}
}
data.fields().len()
},
syn::Body::Enum(_) => panic!("#[derive(HelloWorld)] can only be used with structs"),
};
let mut s = "".to_string();
for fieldline in fieldlines {
s = s + " " + &fieldline + "\n";
}
let complete_string: String = format!("export interface {} {{\n{}}}", structname, s);
quote! {
impl TypeScriptifyTrait for #name {
fn type_script_ify() -> String {
format!("{}\n", #complete_string)
}
}
}
}