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|
use proc_macro::TokenStream;
use quote::quote;
use syn::{Ident, Token, Type, parse_macro_input};
use crate::get_global_set;
/// Converts a PascalCase/UpperCamelCase identifier string to snake_case.
///
/// Examples:
/// - `ErrorNotFound` → `"error_not_found"`
/// - `ErrorNotDir` → `"error_not_dir"`
/// - `FileIO` → `"file_io"`
/// - `XMLParser` → `"xml_parser"`
fn to_snake_case(ident: &str) -> String {
let mut result = String::new();
let mut prev_is_upper = false;
for (i, c) in ident.chars().enumerate() {
if c.is_uppercase() {
if i > 0 && !prev_is_upper {
result.push('_');
}
for lower_c in c.to_lowercase() {
result.push(lower_c);
}
prev_is_upper = true;
} else {
result.push(c);
prev_is_upper = false;
}
}
result
}
enum PackErrInput {
/// pack_err!(ErrorNotFound)
Simple { type_name: Ident },
/// pack_err!(ErrorNotDir = PathBuf)
Typed {
type_name: Ident,
inner_type: Box<Type>,
},
}
impl syn::parse::Parse for PackErrInput {
fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
let type_name: Ident = input.parse()?;
if input.peek(Token![=]) {
input.parse::<Token![=]>()?;
let inner_type: Type = input.parse()?;
Ok(PackErrInput::Typed {
type_name,
inner_type: Box::new(inner_type),
})
} else {
Ok(PackErrInput::Simple { type_name })
}
}
}
#[allow(clippy::too_many_lines)]
pub fn pack_err(input: TokenStream) -> TokenStream {
let parsed = parse_macro_input!(input as PackErrInput);
match parsed {
PackErrInput::Simple { type_name } => {
let name_str = type_name.to_string();
let snake_name = to_snake_case(&name_str);
// Note: No longer derives Serialize under general_renderer.
// Use pack_err_structural for structured output support.
let derive = quote! {
#[derive(::mingling::Groupped)]
};
let expanded = quote! {
#derive
pub struct #type_name {
/// The snake_case name of this error, automatically set at compile time.
pub name: String,
}
impl ::std::default::Default for #type_name {
fn default() -> Self {
Self {
name: #snake_name.into(),
}
}
}
::mingling::macros::register_type!(#type_name);
};
expanded.into()
}
PackErrInput::Typed {
type_name,
inner_type,
} => {
let name_str = type_name.to_string();
let snake_name = to_snake_case(&name_str);
// Note: No longer derives Serialize under general_renderer.
// Use pack_err_structural for structured output support.
let derive = quote! {
#[derive(::mingling::Groupped)]
};
let expanded = quote! {
#derive
pub struct #type_name {
/// The snake_case name of this error, automatically set at compile time.
pub name: String,
/// Additional context info for this error.
pub info: #inner_type,
}
impl #type_name {
/// Creates a new error with the given info.
/// The `name` field is automatically set to the snake_case of the struct name.
pub fn new(info: #inner_type) -> Self {
Self {
name: #snake_name.into(),
info,
}
}
}
::mingling::macros::register_type!(#type_name);
};
expanded.into()
}
}
}
/// `pack_err_structural!` — like `pack_err!` but also marks the type as
/// supporting structured output via `StructuralData`.
///
/// # Syntax
///
/// ```rust,ignore
/// pack_err_structural!(ErrorNotFound);
/// pack_err_structural!(ErrorNotDir = PathBuf);
/// ```
///
/// This is equivalent to:
/// ```rust,ignore
/// pack_err!(ErrorNotFound);
/// impl ::mingling::__private::StructuralDataSealed for ErrorNotFound {}
/// impl ::mingling::__private::StructuralData for ErrorNotFound {}
/// ```
#[cfg(feature = "general_renderer")]
pub fn pack_err_structural(input: TokenStream) -> TokenStream {
let parsed = parse_macro_input!(input as PackErrInput);
let type_name = match &parsed {
PackErrInput::Simple { type_name } => type_name.clone(),
PackErrInput::Typed { type_name, .. } => type_name.clone(),
};
// Register in STRUCTURED_TYPES
let type_name_str = type_name.to_string();
get_global_set(&crate::STRUCTURED_TYPES)
.lock()
.unwrap()
.insert(type_name_str);
let structural_data = quote! {
impl ::mingling::__private::StructuralDataSealed for #type_name {}
impl ::mingling::__private::StructuralData for #type_name {}
};
// Generate the struct + impls (same as pack_err! but with Serialize derive + sealed)
match parsed {
PackErrInput::Simple { type_name } => {
let name_str = type_name.to_string();
let snake_name = to_snake_case(&name_str);
let expanded = quote! {
#[derive(::mingling::Groupped, ::serde::Serialize)]
pub struct #type_name {
/// The snake_case name of this error, automatically set at compile time.
pub name: String,
}
impl ::std::default::Default for #type_name {
fn default() -> Self {
Self {
name: #snake_name.into(),
}
}
}
::mingling::macros::register_type!(#type_name);
#structural_data
};
expanded.into()
}
PackErrInput::Typed {
type_name,
inner_type,
} => {
let name_str = type_name.to_string();
let snake_name = to_snake_case(&name_str);
let expanded = quote! {
#[derive(::mingling::Groupped, ::serde::Serialize)]
pub struct #type_name {
/// The snake_case name of this error, automatically set at compile time.
pub name: String,
/// Additional context info for this error.
pub info: #inner_type,
}
impl #type_name {
/// Creates a new error with the given info.
/// The `name` field is automatically set to the snake_case of the struct name.
pub fn new(info: #inner_type) -> Self {
Self {
name: #snake_name.into(),
info,
}
}
}
::mingling::macros::register_type!(#type_name);
#structural_data
};
expanded.into()
}
}
}
|
