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typegen.rs
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typegen.rs
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mod r#const;
mod r#enum;
mod r#fn;
pub(crate) mod r#struct;
use std::{cell::RefCell, collections::HashMap};
use once_cell::sync::Lazy;
use syn::Type;
#[derive(Default, Debug)]
pub struct TypeDef {
pub kind: String,
pub name: String,
pub original_name: Option<String>,
pub def: String,
pub js_mod: Option<String>,
pub js_doc: String,
}
thread_local! {
static ALIAS: RefCell<HashMap<String, String>> = Default::default();
}
fn add_alias(name: String, alias: String) {
ALIAS.with(|aliases| {
aliases.borrow_mut().insert(name, alias);
});
}
pub fn js_doc_from_comments(comments: &[String]) -> String {
if comments.is_empty() {
return "".to_owned();
}
if comments.len() == 1 {
return format!("/**{} */\n", comments[0]);
}
format!(
"/**\n{} */\n",
comments
.iter()
.map(|c| format!(" *{}\n", c))
.collect::<Vec<String>>()
.join("")
)
}
fn escape_json(src: &str) -> String {
use std::fmt::Write;
let mut escaped = String::with_capacity(src.len());
let mut utf16_buf = [0u16; 2];
let mut pending_backslash = false;
for c in src.chars() {
if pending_backslash {
match c {
'b' | 'f' | 'n' | 'r' | 't' | 'u' | '"' => escaped += "\\",
_ => escaped += "\\\\",
}
pending_backslash = false;
}
match c {
'\x08' => escaped += "\\b",
'\x0c' => escaped += "\\f",
'\n' => escaped += "\\n",
'\r' => escaped += "\\r",
'\t' => escaped += "\\t",
'"' => escaped += "\\\"",
'\\' => {
pending_backslash = true;
}
' ' => escaped += " ",
c if c.is_ascii_graphic() => escaped.push(c),
c => {
let encoded = c.encode_utf16(&mut utf16_buf);
for utf16 in encoded {
write!(escaped, "\\u{:04X}", utf16).unwrap();
}
}
}
}
// cater for trailing backslash
if pending_backslash {
escaped += "\\\\"
}
escaped
}
impl ToString for TypeDef {
fn to_string(&self) -> String {
let js_mod = if let Some(js_mod) = &self.js_mod {
format!(", \"js_mod\": \"{}\"", js_mod)
} else {
"".to_owned()
};
let original_name = if let Some(original_name) = &self.original_name {
format!(", \"original_name\": \"{}\"", original_name)
} else {
"".to_owned()
};
format!(
r#"{{"kind": "{}", "name": "{}", "js_doc": "{}", "def": "{}"{}{}}}"#,
self.kind,
self.name,
escape_json(&self.js_doc),
escape_json(&self.def),
original_name,
js_mod,
)
}
}
pub trait ToTypeDef {
fn to_type_def(&self) -> Option<TypeDef>;
}
static KNOWN_TYPES: Lazy<HashMap<&'static str, &'static str>> = Lazy::new(|| {
let mut map = HashMap::default();
map.extend(crate::PRIMITIVE_TYPES.iter().cloned());
map.extend([
("JsObject", "object"),
("Object", "object"),
("Array", "unknown[]"),
("Value", "any"),
("Map", "Record<string, any>"),
("HashMap", "Record<{}, {}>"),
("ArrayBuffer", "ArrayBuffer"),
("Int8Array", "Int8Array"),
("Uint8Array", "Uint8Array"),
("Uint8ClampedArray", "Uint8ClampedArray"),
("Int16Array", "Int16Array"),
("Uint16Array", "Uint16Array"),
("Int32Array", "Int32Array"),
("Uint32Array", "Uint32Array"),
("Float32Array", "Float32Array"),
("Float64Array", "Float64Array"),
("BigInt64Array", "BigInt64Array"),
("BigUint64Array", "BigUint64Array"),
("DataView", "DataView"),
("DateTime", "Date"),
("Date", "Date"),
("JsDate", "Date"),
("JsBuffer", "Buffer"),
("Buffer", "Buffer"),
("Vec", "Array<{}>"),
("Result", "Error | {}"),
("Error", "Error"),
("JsError", "Error"),
("JsTypeError", "TypeError"),
("JsRangeError", "RangeError"),
("ClassInstance", "{}"),
("Either", "{} | {}"),
("Either3", "{} | {} | {}"),
("Either4", "{} | {} | {} | {}"),
("Either5", "{} | {} | {} | {} | {}"),
("Either6", "{} | {} | {} | {} | {} | {}"),
("Either7", "{} | {} | {} | {} | {} | {} | {}"),
("Either8", "{} | {} | {} | {} | {} | {} | {} | {}"),
("Either9", "{} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either10", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either11", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either12", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either13", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either14", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either15", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either16", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either17", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either18", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either19", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either20", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either21", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either22", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either23", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either24", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either25", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("Either26", "{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}"),
("external", "object"),
("AbortSignal", "AbortSignal"),
("JsGlobal", "typeof global"),
("External", "ExternalObject<{}>"),
("unknown", "unknown"),
("Unknown", "unknown"),
("JsUnknown", "unknown"),
("This", "this")
]);
map
});
fn fill_ty(template: &str, args: Vec<String>) -> String {
let matches = template.match_indices("{}").collect::<Vec<_>>();
if args.len() != matches.len() {
return String::from("any");
}
let mut ret = String::from("");
let mut prev = 0;
matches.into_iter().zip(args).for_each(|((index, _), arg)| {
ret.push_str(&template[prev..index]);
ret.push_str(&arg);
prev = index + 2;
});
ret.push_str(&template[prev..]);
ret
}
pub fn ty_to_ts_type(ty: &Type, is_return_ty: bool, is_struct_field: bool) -> (String, bool) {
match ty {
Type::Reference(r) => ty_to_ts_type(&r.elem, is_return_ty, is_struct_field),
Type::Tuple(tuple) => {
if tuple.elems.is_empty() {
("undefined".to_owned(), false)
} else {
(
format!(
"[{}]",
tuple
.elems
.iter()
.map(|elem| ty_to_ts_type(elem, false, false).0)
.collect::<Vec<_>>()
.join(", ")
),
false,
)
}
}
Type::Path(syn::TypePath { qself: None, path }) => {
let mut ts_ty = None;
if let Some(syn::PathSegment { ident, arguments }) = path.segments.last() {
let rust_ty = ident.to_string();
let args = if let syn::PathArguments::AngleBracketed(arguments) = arguments {
arguments
.args
.iter()
.filter_map(|arg| match arg {
syn::GenericArgument::Type(generic_ty) => {
Some(ty_to_ts_type(generic_ty, false, false))
}
_ => None,
})
.collect::<Vec<_>>()
} else {
vec![]
};
if rust_ty == "Result" && is_return_ty {
ts_ty = Some(args.first().unwrap().to_owned());
} else if rust_ty == "Option" {
ts_ty = args.first().map(|(arg, _)| {
(
if is_struct_field {
arg.to_string()
} else if is_return_ty {
format!("{} | null", arg)
} else {
format!("{} | undefined | null", arg)
},
true,
)
});
} else if rust_ty == "AsyncTask" {
ts_ty = r#struct::TASK_STRUCTS.with(|t| {
let (output_type, _) = args.first().unwrap().to_owned();
if let Some(o) = t.borrow().get(&output_type) {
Some((format!("Promise<{}>", o), false))
} else {
Some(("Promise<unknown>".to_owned(), false))
}
});
} else if rust_ty == "Reference" || rust_ty == "WeakReference" {
ts_ty = r#struct::TASK_STRUCTS.with(|t| {
// Reference<T> => T
if let Some(arg) = args.first() {
let (output_type, _) = arg.to_owned();
if let Some(o) = t.borrow().get(&output_type) {
Some((o.to_owned(), false))
} else {
Some((output_type, false))
}
} else {
// Not NAPI-RS `Reference`
Some((rust_ty, false))
}
});
} else if let Some(&known_ty) = KNOWN_TYPES.get(rust_ty.as_str()) {
if known_ty.contains("{}") {
ts_ty = Some((
fill_ty(known_ty, args.into_iter().map(|(arg, _)| arg).collect()),
false,
));
} else {
ts_ty = Some((known_ty.to_owned(), false));
}
} else if let Some(t) = crate::typegen::r#struct::CLASS_STRUCTS
.with(|c| c.borrow_mut().get(rust_ty.as_str()).cloned())
{
ts_ty = Some((t, false));
} else if rust_ty == "Promise" {
ts_ty = Some((
format!("Promise<{}>", args.first().map(|(arg, _)| arg).unwrap()),
false,
));
} else {
// there should be runtime registered type in else
let type_alias = ALIAS.with(|aliases| {
aliases
.borrow()
.get(rust_ty.as_str())
.map(|a| (a.to_owned(), false))
});
ts_ty = type_alias.or(Some((rust_ty, false)));
}
}
ts_ty.unwrap_or_else(|| ("any".to_owned(), false))
}
Type::Group(g) => ty_to_ts_type(&g.elem, is_return_ty, is_struct_field),
Type::Array(a) => {
let (element_type, is_optional) = ty_to_ts_type(&a.elem, is_return_ty, is_struct_field);
(format!("{}[]", element_type), is_optional)
}
_ => ("any".to_owned(), false),
}
}