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/*!
Implementation details for `emit!` macros.
This crate is not intended to be consumed directly.
*/
#![deny(missing_docs)]
/*
# Organization
This crate contains the proc-macros that are exported in the `emit` crate. It expands to code that uses the `emit::__private` API, in particular the `emit::macro_hooks` module.
# Hooks
Code is transformed through _hooks_. A hook is a well-known method call, like `a.__private_emit_capture_as_default()`. The behavior of the hook is defined in `emit::macro_hooks`. Attribute macros look for these hooks and replace them to change behavior. For example, `#[emit::as_debug]` looks for any `__private_emit_capture_as_*` method and replaces it with `__private_emit_capture_as_debug`.
*/
#![doc(html_logo_url = "https://raw.githubusercontent.com/KodrAus/emit/main/asset/logo.svg")]
extern crate proc_macro;
#[macro_use]
extern crate quote;
#[macro_use]
extern crate syn;
use std::collections::HashMap;
use proc_macro2::TokenStream;
mod args;
mod build;
mod capture;
mod emit;
mod event;
mod filter;
mod fmt;
mod format;
mod hook;
mod key;
mod module;
mod optional;
mod props;
mod span;
mod template;
mod time;
mod util;
use util::ResultToTokens;
fn hooks() -> HashMap<&'static str, fn(TokenStream, TokenStream) -> syn::Result<TokenStream>> {
let mut map = HashMap::new();
map.insert(
"fmt",
(|args: TokenStream, expr: TokenStream| {
fmt::rename_hook_tokens(fmt::RenameHookTokens { args, expr })
}) as fn(TokenStream, TokenStream) -> syn::Result<TokenStream>,
);
map.insert(
"key",
(|args: TokenStream, expr: TokenStream| {
key::rename_hook_tokens(key::RenameHookTokens { args, expr })
}) as fn(TokenStream, TokenStream) -> syn::Result<TokenStream>,
);
map.insert(
"optional",
(|args: TokenStream, expr: TokenStream| {
optional::rename_hook_tokens(optional::RenameHookTokens { args, expr })
}) as fn(TokenStream, TokenStream) -> syn::Result<TokenStream>,
);
map.insert(
"as_value",
(|args: TokenStream, expr: TokenStream| {
capture_as(
"as_value",
args,
expr,
quote!(__private_capture_as_value),
quote!(__private_capture_anon_as_value),
)
}) as fn(TokenStream, TokenStream) -> syn::Result<TokenStream>,
);
map.insert(
"as_debug",
(|args: TokenStream, expr: TokenStream| {
capture_as(
"as_debug",
args,
expr,
quote!(__private_capture_as_debug),
quote!(__private_capture_anon_as_debug),
)
}) as fn(TokenStream, TokenStream) -> syn::Result<TokenStream>,
);
map.insert(
"as_display",
(|args: TokenStream, expr: TokenStream| {
capture_as(
"as_display",
args,
expr,
quote!(__private_capture_as_display),
quote!(__private_capture_anon_as_display),
)
}) as fn(TokenStream, TokenStream) -> syn::Result<TokenStream>,
);
map.insert(
"as_sval",
(|args: TokenStream, expr: TokenStream| {
#[cfg(feature = "sval")]
{
capture_as(
"as_sval",
args,
expr,
quote!(__private_capture_as_sval),
quote!(__private_capture_anon_as_sval),
)
}
#[cfg(not(feature = "sval"))]
{
use syn::spanned::Spanned;
let _ = args;
Err(syn::Error::new(expr.span(), "capturing with `sval` is only possible when the `sval` Cargo feature is enabled"))
}
}) as fn(TokenStream, TokenStream) -> syn::Result<TokenStream>
);
map.insert(
"as_serde",
(|args: TokenStream, expr: TokenStream| {
#[cfg(feature = "serde")]
{
capture_as(
"as_serde",
args,
expr,
quote!(__private_capture_as_serde),
quote!(__private_capture_anon_as_serde),
)
}
#[cfg(not(feature = "serde"))]
{
use syn::spanned::Spanned;
let _ = args;
Err(syn::Error::new(expr.span(), "capturing with `serde` is only possible when the `serde` Cargo feature is enabled"))
}
}) as fn(TokenStream, TokenStream) -> syn::Result<TokenStream>
);
map.insert(
"as_error",
(|args: TokenStream, expr: TokenStream| {
#[cfg(feature = "std")]
{
capture_as(
"as_error",
args,
expr,
quote!(__private_capture_as_error),
quote!(__private_capture_as_error),
)
}
#[cfg(not(feature = "std"))]
{
use syn::spanned::Spanned;
let _ = args;
Err(syn::Error::new(
expr.span(),
"capturing errors is only possible when the `std` Cargo feature is enabled",
))
}
}) as fn(TokenStream, TokenStream) -> syn::Result<TokenStream>,
);
map
}
/**
Format a template.
# Syntax
See the [`macro@emit`] macro for syntax.
# Control parameters
This macro doesn't accept any control parameters.
# Returns
A `String`.
*/
#[proc_macro]
pub fn format(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
format::expand_tokens(format::ExpandTokens {
input: TokenStream::from(item),
})
.unwrap_or_compile_error()
}
/**
Construct an event.
# Syntax
```text
(control_param),* tpl, (property),*
```
where
- `control_param`: A Rust field-value with a pre-determined identifier (see below).
- `tpl`: A template string literal.
- `property`: A Rust field-value for a property to capture.
# Control parameters
This macro accepts the following optional control parameters:
- `module: impl Into<emit::Path>`: The module the event belongs to. If unspecified the current module path is used.
- `props: impl emit::Props`: A base set of properties to add to the event.
- `extent: impl emit::ToExtent`: The extent to use on the event.
# Template
The template for the event. See the [`macro@tpl`] macro for syntax.
# Properties
Properties that appear within the template or after it are added to the emitted event. The identifier of the property is its key. Property capturing can be adjusted through the `as_*` attribute macros.
# Returns
An `emit::Event`.
*/
#[proc_macro]
pub fn event(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
event::expand_tokens(event::ExpandTokens {
level: None,
input: item.into(),
})
.unwrap_or_compile_error()
}
/**
Construct a debug event.
# Syntax
See the [`macro@event`] macro for syntax.
# Returns
An `emit::Event`.
*/
#[proc_macro]
pub fn debug_event(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
event::expand_tokens(event::ExpandTokens {
level: Some(quote!(Debug)),
input: item.into(),
})
.unwrap_or_compile_error()
}
/**
Construct an info event.
# Syntax
See the [`macro@event`] macro for syntax.
# Returns
An `emit::Event`.
*/
#[proc_macro]
pub fn info_event(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
event::expand_tokens(event::ExpandTokens {
level: Some(quote!(Info)),
input: item.into(),
})
.unwrap_or_compile_error()
}
/**
Construct a warn event.
# Syntax
See the [`macro@event`] macro for syntax.
# Returns
An `emit::Event`.
*/
#[proc_macro]
pub fn warn_event(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
event::expand_tokens(event::ExpandTokens {
level: Some(quote!(Warn)),
input: item.into(),
})
.unwrap_or_compile_error()
}
/**
Construct an error event.
# Syntax
See the [`macro@event`] macro for syntax.
# Returns
An `emit::Event`.
*/
#[proc_macro]
pub fn error_event(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
event::expand_tokens(event::ExpandTokens {
level: Some(quote!(Error)),
input: item.into(),
})
.unwrap_or_compile_error()
}
/**
Wrap an operation in a span.
# Syntax
```text
(control_param),* tpl, (property),*
```
where
- `control_param`: A Rust field-value with a pre-determined identifier (see below).
- `tpl`: A template string literal.
- `property`: A Rust field-value for a property to capture.
# Control parameters
This macro accepts the following optional control parameters:
- `rt: impl emit::runtime::Runtime`: The runtime to emit the event through.
- `module: impl Into<emit::Path>`: The module the event belongs to. If unspecified the current module path is used.
- `when: impl emit::Filter`: A filter to use instead of the one configured on the runtime.
- `arg`: An identifier to bind an `emit::Span` to in the body of the span for manual completion.
# Template
The template for the event. See the [`macro@tpl`] macro for syntax.
# Properties
Properties that appear within the template or after it are added to the emitted event. The identifier of the property is its key. Property capturing can be adjusted through the `as_*` attribute macros.
*/
#[proc_macro_attribute]
pub fn span(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
base_span(None, TokenStream::from(args), TokenStream::from(item))
}
/**
Wrap an operation in a debug span.
# Syntax
See the [`macro@span`] macro for syntax.
*/
#[proc_macro_attribute]
pub fn debug_span(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
base_span(
Some(quote!(Debug)),
TokenStream::from(args),
TokenStream::from(item),
)
}
/**
Wrap an operation in an info span.
# Syntax
See the [`macro@span`] macro for syntax.
*/
#[proc_macro_attribute]
pub fn info_span(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
base_span(
Some(quote!(Info)),
TokenStream::from(args),
TokenStream::from(item),
)
}
/**
Wrap an operation in a warn span.
# Syntax
See the [`macro@span`] macro for syntax.
*/
#[proc_macro_attribute]
pub fn warn_span(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
base_span(
Some(quote!(Warn)),
TokenStream::from(args),
TokenStream::from(item),
)
}
/**
Wrap an operation in an error span.
# Syntax
See the [`macro@span`] macro for syntax.
*/
#[proc_macro_attribute]
pub fn error_span(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
base_span(
Some(quote!(Error)),
TokenStream::from(args),
TokenStream::from(item),
)
}
/**
Construct a template.
Templates are text literals that include regular text with _holes_. A hole is a point in the template where a property should be interpolated in.
# Syntax
```text
template_literal
```
where
- `template_literal`: `(text | hole)*`
- `text`: A fragment of plain text where `{` are escaped as `{{` and `}` are escaped as `}}`.
- `hole`: `{property}`
- `property`: A Rust field-value of a property to capture.
# Returns
An `emit::Template`.
*/
#[proc_macro]
pub fn tpl(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
build::expand_template_tokens(build::ExpandTemplateTokens {
input: TokenStream::from(item),
})
.unwrap_or_compile_error()
}
/**
Get the parts of a template.
# Syntax
See the [`macro@tpl`] macro for syntax.
# Returns
An `[emit::template::Part; N]` array.
*/
#[proc_macro]
pub fn tpl_parts(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
build::expand_template_parts_tokens(build::ExpandTemplateTokens {
input: TokenStream::from(item),
})
.unwrap_or_compile_error()
}
/**
Get the current timestamp.
# Syntax
```text
(control_param),*
```
where
- `control_param`: A Rust field-value with a pre-determined identifier (see below).
# Control parameters
This macro accepts the following optional control parameters:
- `rt: impl emit::runtime::Runtime`: The runtime to use to read the timestamp from.
# Returns
An `emit::Timestamp`.
*/
#[proc_macro]
pub fn now(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
time::expand_now_tokens(time::ExpandTokens {
input: TokenStream::from(item),
})
.unwrap_or_compile_error()
}
/**
Start a timer.
# Syntax
```text
(control_param),*
```
where
- `control_param`: A Rust field-value with a pre-determined identifier (see below).
# Control parameters
This macro accepts the following optional control parameters:
- `rt: impl emit::runtime::Runtime`: The runtime to use to read the timestamp from.
# Returns
An `emit::Timestamp`.
*/
#[proc_macro]
pub fn start_timer(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
time::expand_start_timer_tokens(time::ExpandTokens {
input: TokenStream::from(item),
})
.unwrap_or_compile_error()
}
/**
Emit an event.
# Syntax
```text
(control_param),* tpl, (property),*
```
where
- `control_param`: A Rust field-value with a pre-determined identifier (see below).
- `tpl`: A template string literal.
- `property`: A Rust field-value for a property to capture.
# Control parameters
This macro accepts the following optional control parameters:
- `rt: impl emit::runtime::Runtime`: The runtime to emit the event through.
- `event: impl emit::event::ToEvent`: A base event to emit. Any properties captured by the macro will be appended to the base event. If this control parameter is specified then `module`, `props`, and `extent` cannot also be set.
- `module: impl Into<emit::Path>`: The module the event belongs to. If unspecified the current module path is used.
- `props: impl emit::Props`: A base set of properties to add to the event.
- `extent: impl emit::ToExtent`: The extent to use on the event. If it resolves to `None` then the clock on the runtime will be used to assign a point extent.
- `when: impl emit::Filter`: A filter to use instead of the one configured on the runtime.
# Template
The template for the event. See the [`macro@tpl`] macro for syntax.
# Properties
Properties that appear within the template or after it are added to the emitted event. The identifier of the property is its key. Property capturing can be adjusted through the `as_*` attribute macros.
*/
#[proc_macro]
pub fn emit(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
base_emit(None, TokenStream::from(item))
}
/**
Emit a debug event.
# Syntax
See the [`macro@emit`] macro for syntax.
*/
#[proc_macro]
pub fn debug(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
base_emit(Some(quote!(Debug)), TokenStream::from(item))
}
/**
Emit a info event.
# Syntax
See the [`macro@emit`] macro for syntax.
*/
#[proc_macro]
pub fn info(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
base_emit(Some(quote!(Info)), TokenStream::from(item))
}
/**
Emit a warn event.
# Syntax
See the [`macro@emit`] macro for syntax.
*/
#[proc_macro]
pub fn warn(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
base_emit(Some(quote!(Warn)), TokenStream::from(item))
}
/**
Emit an error event.
# Syntax
See the [`macro@emit`] macro for syntax.
*/
#[proc_macro]
pub fn error(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
base_emit(Some(quote!(Error)), TokenStream::from(item))
}
/**
Construct a set of properties.
# Syntax
```text
(property),*
```
where
- `property`: A Rust field-value for a property. The identifier of the field-value is the key of the property.
*/
#[proc_macro]
pub fn props(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
build::expand_props_tokens(build::ExpandPropsTokens {
input: TokenStream::from(item),
})
.unwrap_or_compile_error()
}
/**
Specify Rust format flags to use when rendering a property in a template.
# Syntax
```text
fmt_string
```
where
- `fmt_string`: A string literal with the format flags, like `":?"`. See the [`std::fmt`] docs for details on available flags.
# Applicable to
This attribute can be applied to properties that appear in a template.
*/
#[proc_macro_attribute]
pub fn fmt(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
(hook::get("fmt").unwrap())(TokenStream::from(args), TokenStream::from(item))
.unwrap_or_compile_error()
}
/**
Specify the key for a property.
# Syntax
```text
key
```
where
- `key`: A string literal with the key to use. The key doesn't need to be a valid Rust identifier.
# Applicable to
This attribute can be applied to properties.
*/
#[proc_macro_attribute]
pub fn key(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
(hook::get("key").unwrap())(TokenStream::from(args), TokenStream::from(item))
.unwrap_or_compile_error()
}
/**
Specify that a property value of `None` should not be captured, instead of being captured as `null`.
# Syntax
This macro doesn't accept any arguments.
# Applicable to
This attribute can be applied to properties.
*/
#[proc_macro_attribute]
pub fn optional(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
(hook::get("optional").unwrap())(TokenStream::from(args), TokenStream::from(item))
.unwrap_or_compile_error()
}
/**
Capture a property using its `ToValue` implementation.
# Syntax
This macro doesn't accept any arguments.
# Applicable to
This attribute can be applied to properties.
*/
#[proc_macro_attribute]
pub fn as_value(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
(hook::get("as_value").unwrap())(TokenStream::from(args), TokenStream::from(item))
.unwrap_or_compile_error()
}
/**
Capture a property using its `Debug` implementation.
# Syntax
This macro doesn't accept any arguments.
# Applicable to
This attribute can be applied to properties.
*/
#[proc_macro_attribute]
pub fn as_debug(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
(hook::get("as_debug").unwrap())(TokenStream::from(args), TokenStream::from(item))
.unwrap_or_compile_error()
}
/**
Capture a property using its `Display` implementation.
# Syntax
This macro doesn't accept any arguments.
# Applicable to
This attribute can be applied to properties.
*/
#[proc_macro_attribute]
pub fn as_display(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
(hook::get("as_display").unwrap())(TokenStream::from(args), TokenStream::from(item))
.unwrap_or_compile_error()
}
/**
Capture a property using its `sval::Value` implementation.
# Syntax
This macro doesn't accept any arguments.
# Applicable to
This attribute can be applied to properties.
*/
#[proc_macro_attribute]
pub fn as_sval(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
(hook::get("as_sval").unwrap())(TokenStream::from(args), TokenStream::from(item))
.unwrap_or_compile_error()
}
/**
Capture a property using its `serde::Serialize` implementation.
# Syntax
This macro doesn't accept any arguments.
# Applicable to
This attribute can be applied to properties.
*/
#[proc_macro_attribute]
pub fn as_serde(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
(hook::get("as_serde").unwrap())(TokenStream::from(args), TokenStream::from(item))
.unwrap_or_compile_error()
}
/**
Capture a property using its `Error` implementation.
# Syntax
This macro doesn't accept any arguments.
# Applicable to
This attribute can be applied to properties.
*/
#[proc_macro_attribute]
pub fn as_error(
args: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
(hook::get("as_error").unwrap())(TokenStream::from(args), TokenStream::from(item))
.unwrap_or_compile_error()
}
fn base_emit(level: Option<TokenStream>, item: TokenStream) -> proc_macro::TokenStream {
if filter::matches_build_filter() {
emit::expand_tokens(emit::ExpandTokens { level, input: item }).unwrap_or_compile_error()
} else {
proc_macro::TokenStream::new()
}
}
fn base_span(
level: Option<TokenStream>,
input: TokenStream,
item: TokenStream,
) -> proc_macro::TokenStream {
if filter::matches_build_filter() {
span::expand_tokens(span::ExpandTokens { level, input, item }).unwrap_or_compile_error()
} else {
item.into()
}
}
fn capture_as(
name: &'static str,
args: TokenStream,
expr: TokenStream,
as_fn: TokenStream,
as_anon_fn: TokenStream,
) -> syn::Result<TokenStream> {
capture::rename_hook_tokens(capture::RenameHookTokens {
name,
args,
expr,
to: |args: &capture::Args| {
if args.inspect {
as_fn.clone()
} else {
as_anon_fn.clone()
}
},
})
}