1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417
use super::setting::SettingArgs;
use crate::utils::unwrap_option;
use proc_macro2::{Ident, TokenStream};
use quote::{format_ident, quote, ToTokens};
use syn::{Expr, GenericArgument, Lit, PathArguments, PathSegment, Type, TypePath};
fn get_option_inner(path: &TypePath) -> Option<&TypePath> {
let last_segment = path.path.segments.last().unwrap();
if last_segment.ident != "Option" {
return None;
}
let PathArguments::AngleBracketed(args) = &last_segment.arguments else {
return None;
};
let GenericArgument::Type(arg) = &args.args[0] else {
return None;
};
match &arg {
Type::Path(t) => Some(t),
_ => None,
}
}
pub enum SettingType<'l> {
Nested {
// Raw original value type
raw: &'l Type,
// Inner path type with `Option` unwrapped
path: &'l TypePath,
// Path type wrapped in a collection
collection: NestedType<'l>,
// Wrapped in `Option`
optional: bool,
},
Value {
// Raw original value type
raw: &'l Type,
// Inner value type with `Option` unwrapped
value: &'l Type,
// Wrapped in `Option`
optional: bool,
},
}
impl<'l> SettingType<'l> {
pub fn nested(raw: &Type) -> SettingType {
let mut optional = false;
let Type::Path(raw_path) = raw else {
panic!("Nested values may only be paths/type references.");
};
let path = if let Some(unwrapped_path) = get_option_inner(raw_path) {
optional = true;
unwrapped_path
} else {
raw_path
};
SettingType::Nested {
collection: NestedType::from(path.path.segments.last().unwrap()),
raw,
path,
optional,
}
}
pub fn value(raw: &Type) -> SettingType {
let mut optional = false;
let value = if let Some(unwrapped_value) = unwrap_option(raw) {
optional = true;
unwrapped_value
} else {
raw
};
SettingType::Value {
raw,
value,
optional,
}
}
pub fn is_optional(&self) -> bool {
match self {
SettingType::Nested { optional, .. } => *optional,
SettingType::Value { optional, .. } => *optional,
}
}
pub fn get_inner_type(&self) -> Option<&'l Type> {
match self {
SettingType::Nested { .. } => None,
SettingType::Value { value, .. } => Some(value),
}
}
pub fn get_default_value(&self, name: &Ident, args: &SettingArgs) -> TokenStream {
match self {
SettingType::Nested { collection, .. } => match collection {
NestedType::None(id) if !self.is_optional() => {
let partial_name = format_ident!("Partial{}", id);
quote! { Some(#partial_name::default_values(context)?) }
}
_ => quote! { None },
},
SettingType::Value { value, .. } => {
if let Some(expr) = args.default.as_ref() {
return match expr {
Expr::Array(_) | Expr::Call(_) | Expr::Macro(_) | Expr::Tuple(_) => {
quote! { Some(#expr) }
}
Expr::Path(func) => quote! { #func(context) },
Expr::Lit(lit) => match &lit.lit {
Lit::Str(string) => quote! {
Some(
#value::try_from(#string)
.map_err(|e| schematic::ConfigError::InvalidDefault(e.to_string()))?
)
},
other => quote! { Some(#other) },
},
invalid => {
let name = name.to_string();
let info = format!("{:?}", invalid);
panic!("Unsupported default value for {name} ({info}). May only provide literals, primitives, arrays, or tuples.");
}
};
};
quote! { None }
}
}
}
pub fn get_env_value(&self, args: &SettingArgs) -> TokenStream {
match (&args.env, &args.parse_env) {
(Some(env), Some(parse_env)) => {
quote! {
schematic::internal::parse_from_env_var(#env, #parse_env)?
}
}
(Some(env), None) => {
quote! {
schematic::internal::default_from_env_var(#env)?
}
}
_ => quote! { None },
}
}
pub fn get_from_value(&self, name: &Ident, args: &SettingArgs) -> TokenStream {
match self {
SettingType::Nested {
collection,
optional,
..
} => {
let statement = match collection {
NestedType::None(id) => {
quote! {
#id::from_partial(context, data, with_env)?
}
}
NestedType::Set(api, item) => {
if *api == "Vec" {
quote! {
{
let mut result = #api::with_capacity(data.len());
for v in data {
result.push(#item::from_partial(context, v, with_env)?);
}
result
}
}
} else {
quote! {
{
let mut result = #api::new();
for v in data {
result.insert(#item::from_partial(context, v, with_env)?);
}
result
}
}
}
// quote! {
// let result = Result<#api<_>, schematic::ConfigError> = data
// .into_iter()
// .map(|v| #item::from_partial(context, v, with_env))
// .collect::<#api<Result<_, schematic::ConfigError>>>();
// result?
// }
}
NestedType::Map(api, _, value) => {
quote! {
{
let mut result = #api::new();
for (k, v) in data {
result.insert(k, #value::from_partial(context, v, with_env)?);
}
result
}
}
// quote! {
// let result = Result<#api<_, _>, schematic::ConfigError> = data
// .into_iter()
// .map(|(k, v)| (k, #value::from_partial(context, v, with_env)))
// .collect::<#api<_, Result<_, schematic::ConfigError>>>();
// result?
// }
}
};
if *optional {
quote! {
if let Some(data) = partial.#name {
Some(#statement)
} else {
None
}
}
} else {
quote! {
{
let data = partial.#name.unwrap_or_default();
#statement
}
}
}
}
SettingType::Value { optional, .. } => {
// Reset extendable values since we don't have the entire resolved list
if args.extend {
quote! { Default::default() }
// Use optional values as-is as they're already wrapped in `Option`
} else if *optional {
quote! { partial.#name }
// Otherwise unwrap the resolved value or use the type default
} else {
quote! { partial.#name.unwrap_or_default() }
}
}
}
}
pub fn get_merge_statement(&self, name: &Ident, args: &SettingArgs) -> TokenStream {
// Nested values require special partial merging
if let SettingType::Nested {
// However this only applies to direct types and
// not those wrapped in a collection
collection: NestedType::None(_),
..
} = self
{
if args.merge.is_some() {
panic!("Nested configs do not support `merge` unless wrapped in a collection.");
}
return quote! {
self.#name = schematic::internal::merge_partial_settings(
self.#name.take(),
next.#name.take(),
context,
)?;
};
};
// Everything elses uses basic merging
if let Some(func) = args.merge.as_ref() {
quote! {
self.#name = schematic::internal::merge_settings(
self.#name.take(),
next.#name.take(),
context,
#func,
)?;
}
} else {
quote! {
if next.#name.is_some() {
self.#name = next.#name;
}
}
}
}
pub fn get_validate_statement(&self, name: &Ident, args: &SettingArgs) -> Option<TokenStream> {
let name_quoted = format!("{}", name);
match self {
SettingType::Nested { collection, .. } => match collection {
NestedType::None(_) => Some(quote! {
if let Err(nested_error) = setting.validate_with_path(context, path.join_key(#name_quoted)) {
errors.push(schematic::ValidateErrorType::nested(nested_error));
}
}),
NestedType::Set(_, _) => Some(quote! {
for (i, item) in setting.iter().enumerate() {
if let Err(nested_error) = item.validate_with_path(context, path.join_key(#name_quoted).join_index(i)) {
errors.push(schematic::ValidateErrorType::nested(nested_error));
}
}
}),
NestedType::Map(_, _, _) => Some(quote! {
for (key, value) in setting {
if let Err(nested_error) = value.validate_with_path(context, path.join_key(#name_quoted).join_key(key)) {
errors.push(schematic::ValidateErrorType::nested(nested_error));
}
}
}),
},
SettingType::Value { .. } => {
if let Some(expr) = args.validate.as_ref() {
let func = match expr {
// func(arg)()
Expr::Call(func) => quote! { #func },
// func()
Expr::Path(func) => quote! { #func },
_ => {
panic!("Unsupported `validate` syntax.");
}
};
Some(quote! {
if let Err(error) = #func(setting, self, context) {
errors.push(schematic::ValidateErrorType::setting(
path.join_key(#name_quoted),
error,
));
}
})
} else {
None
}
}
}
}
}
impl<'l> ToTokens for SettingType<'l> {
fn to_tokens(&self, tokens: &mut TokenStream) {
match self {
SettingType::Nested {
path, collection, ..
} => {
tokens.extend(match collection {
NestedType::None(_) => {
quote! { Option<<#path as schematic::Config>::Partial> }
}
NestedType::Set(container, item) => {
quote! { Option<#container<<#item as schematic::Config>::Partial>> }
}
NestedType::Map(container, key, value) => {
quote! {
Option<#container<#key, <#value as schematic::Config>::Partial>>
}
}
});
}
SettingType::Value { value, .. } => {
tokens.extend(quote! { Option<#value> });
}
}
}
}
pub enum NestedType<'l> {
// Struct
None(&'l Ident),
// Vec<Struct>, HashSet<Struct>, ...
Set(&'l Ident, &'l GenericArgument),
// HashMap<_, Struct>, ...
Map(&'l Ident, &'l GenericArgument, &'l GenericArgument),
}
impl<'l> NestedType<'l> {
pub fn from(segment: &PathSegment) -> NestedType {
let container = &segment.ident;
match &segment.arguments {
// Struct
PathArguments::None => NestedType::None(container),
// Vec<Struct>, HashMap<_, Struct>, ...
PathArguments::AngleBracketed(args) => match container.to_string().as_str() {
"Vec" | "HashSet" | "FxHashSet" | "BTreeSet" => {
let item = args.args.first().unwrap();
NestedType::Set(container, item)
}
"HashMap" | "FxHashMap" | "BTreeMap" => {
let key = args.args.first().unwrap();
let value = args.args.last().unwrap();
NestedType::Map(container, key, value)
}
_ => panic!("Unsupported collection used with nested config."),
},
// ...
_ => panic!("Parens are not supported for nested config."),
}
}
}