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//! Parser and code generation handler for `def-msg` schema declarations.
use std::error::Error;
use anyhow::Result;
use lisp_rpc_rust_parser::Parser;
use lisp_rpc_rust_parser::{Atom, Expr, TypeValue};
use super::*;
#[derive(Debug)]
enum DefMsgErrorType {
InvalidInput,
}
#[derive(Debug)]
struct DefMsgError {
msg: String,
err_type: DefMsgErrorType,
}
impl std::fmt::Display for DefMsgError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{:?}: {}", self.err_type, self.msg)
}
}
impl Error for DefMsgError {}
/// Represents a parsed `(def-msg name :key type ...)` specification declaration.
#[derive(Debug, Eq, PartialEq)]
pub struct DefMsg {
msg_name: String,
/// the keywords and their types pairs
rest_expr: Vec<Expr>,
/// anonymous msg can be the map
msg_ty: RPCDataType,
}
impl DefMsg {
/// Creates a new [`DefMsg`] specification item.
pub fn new(msg_name: &str, rest_expr: &[Expr], ty: RPCDataType) -> Result<Self> {
if rest_expr.iter().array_chunks().all(|[k, _]| {
matches!(
k,
Expr::Atom(Atom {
value: TypeValue::Keyword(_),
})
)
}) {
Ok(Self {
msg_name: msg_name.to_string(),
rest_expr: rest_expr.to_vec(),
msg_ty: ty,
})
} else {
anyhow::bail!(DefMsgError {
msg: "parsing failed, msg name arguments should be keyword-value pairs".to_string(),
err_type: DefMsgErrorType::InvalidInput,
})
}
}
/// Parses a [`DefMsg`] declaration from a string slice.
pub fn from_str(source: &str, parser: Option<Parser>) -> Result<Self> {
use std::io::Cursor;
let mut p = match parser {
Some(p) => p,
None => Default::default(),
};
p.tokenize(Cursor::new(source))?;
p.parse_one()?;
Self::from_expr(p.iter_expr().last().context("Cannot get the last expr")?)
}
/// Returns `true` if the expression is a `def-msg` list expression.
pub fn if_def_msg_expr(expr: &Expr) -> bool {
match &expr {
Expr::List(e) => match &e[0] {
Expr::Atom(Atom {
value: TypeValue::Symbol(s),
..
}) => s == "def-msg",
_ => false,
},
_ => false,
}
}
/// Parses a [`DefMsg`] declaration from an [`Expr`].
pub fn from_expr(expr: &Expr) -> Result<Self> {
let rest_expr: &[Expr];
if Self::if_def_msg_expr(expr) {
match &expr {
Expr::List(e) => rest_expr = &e[1..],
_ => {
anyhow::bail!(DefMsgError {
msg: "parsing failed, the first symbol should be def-msg".to_string(),
err_type: DefMsgErrorType::InvalidInput,
});
}
}
} else {
anyhow::bail!(DefMsgError {
msg: "parsing failed, the first symbol should be def-msg".to_string(),
err_type: DefMsgErrorType::InvalidInput,
});
}
let name = match &rest_expr[0] {
Expr::Atom(Atom {
value: TypeValue::Symbol(s),
..
}) => s,
_ => {
anyhow::bail!(DefMsgError {
msg: "parsing failed, msg name should be symbol".to_string(),
err_type: DefMsgErrorType::InvalidInput,
});
}
};
Self::new(name, &rest_expr[1..], RPCDataType::Msg)
}
/// Transforms this message specification into [`GeneratedStruct`] definitions.
pub fn create_gen_structs(&self) -> Result<Vec<GeneratedStruct>> {
let mut res = vec![];
let mut fields = vec![];
for [k, v] in self.rest_expr.iter().array_chunks() {
match (k, v) {
(
Expr::Atom(Atom {
value: TypeValue::Keyword(f),
}),
Expr::Quote(box Expr::Atom(Atom {
value: TypeValue::Symbol(t),
})),
) => {
fields.push(GeneratedField::new(
kebab_to_snake_case(f),
type_translate(t),
None,
)?);
}
(
Expr::Atom(Atom {
value: TypeValue::Keyword(f),
}),
Expr::Quote(box Expr::List(inner_exprs)) | Expr::List(inner_exprs),
) => {
// anonymity msg type
// the map lisp-rpc defination can generate the other msg
// the list lisp-rpc defination can directly generated to Vec<T>
match (&inner_exprs[0], &inner_exprs[1]) {
// map type, the first ele is keyword
(
Expr::Atom(Atom {
value: TypeValue::Keyword(_),
}),
_,
) => {
let new_msg_name = self.msg_name.to_string() + "-" + f;
res.append(
&mut Self::new(&new_msg_name, inner_exprs, RPCDataType::Map)?
.create_gen_structs()?,
);
fields.push(GeneratedField::new(
kebab_to_snake_case(f),
type_translate(&new_msg_name),
None,
)?);
}
// list type, the first ele is "list"
(
Expr::Atom(Atom {
value: TypeValue::Symbol(l),
}),
Expr::Quote(box Expr::Atom(Atom {
value: TypeValue::Symbol(t),
})),
) if l == "list" => {
let new_type_name = format!("Vec<{}>", type_translate(t));
fields.push(GeneratedField::new(
kebab_to_snake_case(f),
new_type_name,
None,
)?);
}
// optional type, the first ele is "optional"
(
Expr::Atom(Atom {
value: TypeValue::Symbol(o),
}),
Expr::Quote(box Expr::Atom(Atom {
value: TypeValue::Symbol(t),
})),
) if o == "optional" => {
let new_type_name = format!("Option<{}>", type_translate(t));
fields.push(GeneratedField::new(
kebab_to_snake_case(f),
new_type_name,
None,
)?);
}
_ => {
anyhow::bail!(DefMsgError {
msg:
"create gen structs failed, anonymity type can only be the (map|list|optional 'type)"
.to_string(),
err_type: DefMsgErrorType::InvalidInput,
})
}
}
}
_ => {
anyhow::bail!(DefMsgError {
msg:
"create gen structs failed, arguments has to be the keywords-value pair"
.to_string(),
err_type: DefMsgErrorType::InvalidInput,
});
}
}
}
res.push(GeneratedStruct::new(
&self.msg_name,
fields,
None,
self.msg_ty.clone(),
None,
));
Ok(res)
}
/// Generates Rust code for this message using template files from disk.
pub fn gen_code_with_files(&self, template_files: &[impl AsRef<Path>]) -> Result<String> {
let mut bucket = vec![];
for s in self.create_gen_structs()? {
bucket.push(s.gen_code_with_files(template_files)?);
}
Ok(bucket.join("\n\n"))
}
/// Generates Rust code for this message using an existing [`Tera`] instance.
pub fn gen_code_with_tera(&self, templates: &Tera) -> Result<String> {
let mut bucket = vec![];
for s in self.create_gen_structs()? {
bucket.push(s.gen_code_with_tera(templates)?);
}
Ok(bucket.join("\n\n") + "\n\n")
}
}
impl RPCSpec for DefMsg {
fn as_lib(&self) -> Option<&dyn RPCSpecLib> {
Some(self)
}
fn file_target(&self) -> TargetFile {
TargetFile::Lib
}
fn symbol_name(&self) -> String {
self.msg_name.clone()
}
}
impl RPCSpecLib for DefMsg {
fn generate_structs(&self) -> Result<Vec<GeneratedStruct>> {
self.create_gen_structs()
}
}