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Mod-export 'msg!', 'local_cache!', 'try_outcome!'. 

This removes the export of each of these macros from the root, limiting
their export-scope to their respective module. This is accomplished
using a new internal macro, 'export!', which does some "magic" to work
around rustdoc deficiencies.
This commit is contained in:
Sergio Benitez 2021-04-28 01:29:05 -07:00
parent 41018a5112
commit bab3b1cb5b
13 changed files with 258 additions and 153 deletions
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56
core/codegen/src/bang/export.rs Normal file
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@ -0,0 +1,56 @@
use std::hash::Hash;
use devise::Spanned;
use devise::ext::SpanDiagnosticExt;
use devise::proc_macro2::{TokenStream, TokenTree, Punct};
use devise::syn;
use crate::syn_ext::IdentExt;
pub fn _macro(input: proc_macro::TokenStream) -> devise::Result<TokenStream> {
let mac: syn::ItemMacro = syn::parse(input)?;
let macro_name = match mac.ident {
Some(ident) => ident,
None => return Err(mac.span().error("expected `macro_rules!`")),
};
// We rename the actual `macro_export` macro so we don't accidentally use it
// internally from the auto-imported crate root macro namespace.
let (attrs, def) = (mac.attrs, mac.mac);
let internal_name = macro_name.prepend("___internal_");
let mod_name = macro_name.uniqueify_with(|mut hasher| def.hash(&mut hasher));
let macro_rules_tokens = def.tokens.clone();
let decl_macro_tokens: TokenStream = def.tokens.into_iter()
.map(|t| match t {
TokenTree::Punct(p) if p.as_char() == ';' => {
let mut token = Punct::new(',', p.spacing());
token.set_span(p.span());
TokenTree::Punct(token)
},
_ => t,
})
.collect();
Ok(quote! {
#[allow(non_snake_case)]
mod #mod_name {
#[doc(hidden)]
#[macro_export]
macro_rules! #internal_name {
#macro_rules_tokens
}
pub use #internal_name;
}
#(#attrs)*
#[cfg(all(nightly, doc))]
pub macro #macro_name {
#decl_macro_tokens
}
#[cfg(not(all(nightly, doc)))]
pub use #mod_name::#internal_name as #macro_name;
})
}

6
core/codegen/src/bang/mod.rs
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@ -7,6 +7,7 @@ use crate::syn::spanned::Spanned;
mod uri;
mod uri_parsing;
mod test_guide;
mod export;
fn struct_maker_vec(
input: proc_macro::TokenStream,
@ -65,3 +66,8 @@ pub fn guide_tests_internal(input: proc_macro::TokenStream) -> TokenStream {
test_guide::_macro(input)
.unwrap_or_else(|diag| diag.emit_as_item_tokens())
}
pub fn export_internal(input: proc_macro::TokenStream) -> TokenStream {
export::_macro(input)
.unwrap_or_else(|diag| diag.emit_as_item_tokens())
}

7
core/codegen/src/lib.rs
View File

@ -1062,3 +1062,10 @@ pub fn rocket_internal_uri(input: TokenStream) -> TokenStream {
pub fn internal_guide_tests(input: TokenStream) -> TokenStream {
emit!(bang::guide_tests_internal(input))
}
#[doc(hidden)]
#[proc_macro]
/// Private Rocket internal macro: `export!`.
pub fn export(input: TokenStream) -> TokenStream {
emit!(bang::export_internal(input))
}

2
core/lib/src/data/from_data.rs
View File

@ -1,7 +1,7 @@
use crate::http::{RawStr, Status};
use crate::request::{Request, local_cache};
use crate::data::{Data, Limits};
use crate::outcome::{self, IntoOutcome, Outcome::*};
use crate::outcome::{self, IntoOutcome, try_outcome, Outcome::*};
/// Type alias for the `Outcome` of [`FromData`].
///

3
core/lib/src/form/form.rs
View File

@ -1,6 +1,7 @@
use std::ops::{Deref, DerefMut};
use crate::request::Request;
use crate::Request;
use crate::outcome::try_outcome;
use crate::data::{Data, FromData, Outcome};
use crate::http::{RawStr, ext::IntoOwned};
use crate::form::parser::{Parser, RawStrParser, Buffer};

110
core/lib/src/form/validate.rs
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@ -88,52 +88,76 @@ use rocket_http::ContentType;
use crate::{data::TempFile, form::{Result, Error}};
/// A helper macro for custom validation error messages.
///
/// The macro works identically to [`std::format!`] except it does not allocate
/// when the expression is a string literal. It returns a function (a closure)
/// that takes one parameter and evaluates to an `Err` of validation [`Error`]
/// with the formatted message. While useful in other contexts, it is designed
/// to be chained to validation results via `.or_else()` and `.and_then()`.
///
/// Note that the macro never needs to be imported when used with a `FromForm`
/// derive; all items in [`form::validate`](crate::form::validate) are already
/// in scope.
///
/// # Example
///
/// ```rust
/// use rocket::form::FromForm;
///
/// #[derive(FromForm)]
/// struct Person<'r> {
/// #[field(validate = len(3..).or_else(msg!("that's a short name...")))]
/// name: &'r str,
/// #[field(validate = contains('f').and_then(msg!("please, no `f`!")))]
/// non_f_name: &'r str,
/// }
/// ```
///
/// See the [top-level docs](crate::form::validate) for more examples.
#[macro_export]
macro_rules! msg {
($e:expr) => (
|_| {
Err($crate::form::Errors::from($crate::form::Error::validation($e)))
as $crate::form::Result<()>
crate::export! {
/// A helper macro for custom validation error messages.
///
/// The macro works similar to [`std::format!`]. It generates a form
/// [`Validation`] error message. While useful in other contexts, it is
/// designed to be chained to validation results in derived `FromForm`
/// `#[field]` attributes via `.or_else()` and `.and_then()`.
///
/// [`Validation`]: crate::form::error::ErrorKind::Validation
/// [`form::validate`]: crate::form::validate
///
/// # Example
///
/// ```rust
/// use rocket::form::FromForm;
///
/// #[derive(FromForm)]
/// struct Person<'r> {
/// #[field(validate = len(3..).or_else(msg!("that's a short name...")))]
/// name: &'r str,
/// #[field(validate = contains('f').and_then(msg!("please, no `f`!")))]
/// non_f_name: &'r str,
/// }
/// ```
///
/// _**Note:** this macro _never_ needs to be imported when used with a
/// `FromForm` derive; all items in [`form::validate`] are automatically in
/// scope in `FromForm` derive attributes._
///
/// See the [top-level docs](crate::form::validate) for more examples.
///
/// # Syntax
///
/// The macro has the following "signatures":
///
/// ## Variant 1
///
/// ```rust
/// # use rocket::form;
/// # trait Expr {}
/// fn msg<'a, T, P, E: Expr>(expr: E) -> impl Fn(P) -> form::Result<'a, T>
/// # { |_| unimplemented!() }
/// ```
///
/// Takes any expression and returns a function that takes any argument type
/// and evaluates to a [`form::Result`](crate::form::Result) with an `Ok` of
/// any type. The `Result` is guaranteed to be an `Err` of kind
/// [`Validation`] with `expr` as the message.
///
/// ## Variant 2
///
/// ```
/// # use rocket::form;
/// # trait Format {}
/// # trait Args {}
/// fn msg<'a, T, P, A: Args>(fmt: &str, args: A) -> impl Fn(P) -> form::Result<'a, T>
/// # { |_| unimplemented!() }
/// ```
///
/// Invokes the first variant as `msg!(format!(fmt, args))`.
macro_rules! msg {
($e:expr) => (|_| {
Err($crate::form::Errors::from(
$crate::form::Error::validation($e)
)) as $crate::form::Result<()>
});
($($arg:tt)*) => ($crate::form::validate::msg!(format!($($arg)*)));
}
);
($($arg:tt)*) => (
|_| {
Err($crate::form::Errors::from($crate::form::Error::validation(format!($($arg)*))))
as $crate::form::Result<()>
}
);
}
#[doc(inline)]
pub use msg;
/// Equality validator: succeeds exactly when `a` == `b`, using [`PartialEq`].
///
/// On failure, returns a validation error with the following message:

1
core/lib/src/lib.rs
View File

@ -4,6 +4,7 @@
#![doc(html_favicon_url = "https://rocket.rs/images/favicon.ico")]
#![doc(html_logo_url = "https://rocket.rs/images/logo-boxed.png")]
#![cfg_attr(nightly, feature(doc_cfg))]
#![cfg_attr(nightly, feature(decl_macro))]
#![warn(rust_2018_idioms)]

134
core/lib/src/outcome.rs
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@ -612,65 +612,77 @@ impl<'a, S: Send + 'a, E: Send + 'a, F: Send + 'a> Outcome<S, E, F> {
}
}
/// Unwraps a [`Success`](Outcome::Success) or propagates a `Forward` or
/// `Failure`.
///
/// This is just like `?` (or previously, `try!`), but for `Outcome`. In the
/// case of a `Forward` or `Failure` variant, the inner type is passed to
/// [`From`](std::convert::From), allowing for the conversion between specific
/// and more general types. The resulting forward/error is immediately returned.
///
/// Because of the early return, `try_outcome!` can only be used in methods that
/// return [`Outcome`].
///
/// [`Outcome`]: crate::outcome::Outcome
///
/// ## Example
///
/// ```rust,no_run
/// # #[macro_use] extern crate rocket;
/// use std::sync::atomic::{AtomicUsize, Ordering};
///
/// use rocket::State;
/// use rocket::request::{self, Request, FromRequest};
/// use rocket::outcome::Outcome::*;
///
/// #[derive(Default)]
/// struct Atomics {
/// uncached: AtomicUsize,
/// cached: AtomicUsize,
/// }
///
/// struct Guard1;
/// struct Guard2;
///
/// #[rocket::async_trait]
/// impl<'r> FromRequest<'r> for Guard1 {
/// type Error = ();
///
/// async fn from_request(req: &'r Request<'_>) -> request::Outcome<Self, ()> {
/// // Attempt to fetch the guard, passing through any error or forward.
/// let atomics = try_outcome!(req.guard::<State<'_, Atomics>>().await);
/// atomics.uncached.fetch_add(1, Ordering::Relaxed);
/// req.local_cache(|| atomics.cached.fetch_add(1, Ordering::Relaxed));
///
/// Success(Guard1)
/// }
/// }
///
/// #[rocket::async_trait]
/// impl<'r> FromRequest<'r> for Guard2 {
/// type Error = ();
///
/// async fn from_request(req: &'r Request<'_>) -> request::Outcome<Self, ()> {
/// // Attempt to fetch the guard, passing through any error or forward.
/// let guard1: Guard1 = try_outcome!(req.guard::<Guard1>().await);
/// Success(Guard2)
/// }
/// }
/// ```
#[macro_export]
macro_rules! try_outcome {
crate::export! {
/// Unwraps a [`Success`](Outcome::Success) or propagates a `Forward` or
/// `Failure`.
///
/// # Syntax
///
/// The macro has the following "signature":
///
/// ```rust
/// use rocket::outcome::Outcome;
///
/// // Returns the inner `S` if `outcome` is `Outcome::Success`. Otherwise
/// // returns from the caller with `Outcome<impl From<E>, impl From<F>>`.
/// fn try_outcome<S, E, F>(outcome: Outcome<S, E, F>) -> S
/// # { unimplemented!() }
/// ```
///
/// This is just like `?` (or previously, `try!`), but for `Outcome`. In the
/// case of a `Forward` or `Failure` variant, the inner type is passed to
/// [`From`](std::convert::From), allowing for the conversion between
/// specific and more general types. The resulting forward/error is
/// immediately returned. Because of the early return, `try_outcome!` can
/// only be used in methods that return [`Outcome`].
///
/// [`Outcome`]: crate::outcome::Outcome
///
/// ## Example
///
/// ```rust,no_run
/// # #[macro_use] extern crate rocket;
/// use std::sync::atomic::{AtomicUsize, Ordering};
///
/// use rocket::State;
/// use rocket::request::{self, Request, FromRequest};
/// use rocket::outcome::{try_outcome, Outcome::*};
///
/// #[derive(Default)]
/// struct Atomics {
/// uncached: AtomicUsize,
/// cached: AtomicUsize,
/// }
///
/// struct Guard1;
/// struct Guard2;
///
/// #[rocket::async_trait]
/// impl<'r> FromRequest<'r> for Guard1 {
/// type Error = ();
///
/// async fn from_request(req: &'r Request<'_>) -> request::Outcome<Self, ()> {
/// // Attempt to fetch the guard, passing through any error or forward.
/// let atomics = try_outcome!(req.guard::<State<'_, Atomics>>().await);
/// atomics.uncached.fetch_add(1, Ordering::Relaxed);
/// req.local_cache(|| atomics.cached.fetch_add(1, Ordering::Relaxed));
///
/// Success(Guard1)
/// }
/// }
///
/// #[rocket::async_trait]
/// impl<'r> FromRequest<'r> for Guard2 {
/// type Error = ();
///
/// async fn from_request(req: &'r Request<'_>) -> request::Outcome<Self, ()> {
/// // Attempt to fetch the guard, passing through any error or forward.
/// let guard1: Guard1 = try_outcome!(req.guard::<Guard1>().await);
/// Success(Guard2)
/// }
/// }
/// ```
macro_rules! try_outcome {
($expr:expr $(,)?) => (match $expr {
$crate::outcome::Outcome::Success(val) => val,
$crate::outcome::Outcome::Failure(e) => {
@ -680,11 +692,9 @@ macro_rules! try_outcome {
return $crate::outcome::Outcome::Forward(::std::convert::From::from(f))
},
});
}
}
#[doc(inline)]
pub use try_outcome;
impl<S, E, F> fmt::Debug for Outcome<S, E, F> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Outcome::{}", self.formatting().1)

4
core/lib/src/request/from_request.rs
View File

@ -247,7 +247,7 @@ impl<S, E> IntoOutcome<S, (Status, E), ()> for Result<S, E> {
/// ```rust
/// # #[macro_use] extern crate rocket;
/// # #[cfg(feature = "secrets")] mod wrapper {
/// # use rocket::outcome::IntoOutcome;
/// # use rocket::outcome::{IntoOutcome, try_outcome};
/// # use rocket::request::{self, Outcome, FromRequest, Request};
/// # struct User { id: String, is_admin: bool }
/// # struct Database;
@ -311,7 +311,7 @@ impl<S, E> IntoOutcome<S, (Status, E), ()> for Result<S, E> {
/// ```rust
/// # #[macro_use] extern crate rocket;
/// # #[cfg(feature = "secrets")] mod wrapper {
/// # use rocket::outcome::IntoOutcome;
/// # use rocket::outcome::{IntoOutcome, try_outcome};
/// # use rocket::request::{self, Outcome, FromRequest, Request};
/// # struct User { id: String, is_admin: bool }
/// # struct Database;

54
core/lib/src/request/mod.rs
View File

@ -14,35 +14,33 @@ pub use self::from_param::{FromParam, FromSegments};
#[doc(inline)]
pub use crate::response::flash::FlashMessage;
/// Store and immediately retrieve a value `$v` in `$request`'s local cache
/// using a locally generated anonymous type to avoid type conflicts.
///
/// # Example
///
/// ```rust
/// use rocket::request::local_cache;
/// # let c = rocket::local::blocking::Client::debug_with(vec![]).unwrap();
/// # let request = c.get("/");
///
/// // The first store into local cache for a given type wins.
/// assert_eq!(request.local_cache(|| String::from("hello")), "hello");
///
/// // The following returns the cached, previously stored value for the type.
/// assert_eq!(request.local_cache(|| String::from("goodbye")), "hello");
///
/// // This shows that we cannot cache different values of the same type; we
/// // _must_ use a proxy type. To avoid the need to write these manually, use
/// // `local_cache!`, which generates one of the fly.
/// assert_eq!(local_cache!(request, String::from("hello")), "hello");
/// assert_eq!(local_cache!(request, String::from("goodbye")), "goodbye");
/// ```
#[macro_export]
macro_rules! local_cache {
($request:expr, $v:expr) => ({
crate::export! {
/// Store and immediately retrieve a value `$v` in `$request`'s local cache
/// using a locally generated anonymous type to avoid type conflicts.
///
/// # Example
///
/// ```rust
/// use rocket::request::local_cache;
/// # let c = rocket::local::blocking::Client::debug_with(vec![]).unwrap();
/// # let request = c.get("/");
///
/// // The first store into local cache for a given type wins.
/// assert_eq!(request.local_cache(|| String::from("hello")), "hello");
///
/// // The following returns the cached, previously stored value for the type.
/// assert_eq!(request.local_cache(|| String::from("goodbye")), "hello");
///
/// // This shows that we cannot cache different values of the same type; we
/// // _must_ use a proxy type. To avoid the need to write these manually, use
/// // `local_cache!`, which generates one of the fly.
/// assert_eq!(local_cache!(request, String::from("hello")), "hello");
/// assert_eq!(local_cache!(request, String::from("goodbye")), "goodbye");
/// ```
macro_rules! local_cache {
($request:expr, $v:expr $(,)?) => ({
struct Local<T>(T);
&$request.local_cache(move || Local($v)).0
})
}
}
#[doc(inline)]
pub use local_cache;

5
core/lib/src/request/request.rs
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@ -571,8 +571,9 @@ impl<'r> Request<'r> {
/// Different values of the same type _cannot_ be cached without using a
/// proxy, wrapper type. To avoid the need to write these manually, or for
/// libraries wishing to store values of public types, use the
/// [`local_cache!`] macro to generate a locally anonymous wrapper type,
/// store, and retrieve the wrapped value from request-local cache.
/// [`local_cache!`](crate::request::local_cache) macro to generate a
/// locally anonymous wrapper type, store, and retrieve the wrapped value
/// from request-local cache.
///
/// # Example
///

2
examples/state/src/request_local.rs
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@ -1,7 +1,7 @@
use std::sync::atomic::{AtomicUsize, Ordering};
use rocket::State;
use rocket::outcome::Outcome;
use rocket::outcome::{Outcome, try_outcome};
use rocket::request::{self, FromRequest, Request};
use rocket::fairing::AdHoc;

1
site/guide/6-state.md
View File

@ -122,6 +122,7 @@ implementation. To do so, simply invoke `State<T>` as a guard using the
use rocket::State;
use rocket::request::{self, Request, FromRequest};
use rocket::outcome::try_outcome;
# use std::sync::atomic::{AtomicUsize, Ordering};
# struct T;