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| <span id="1267">1267</span> |
| </pre><pre class="rust"><code><span class="doccomment">//! `Span` and `Event` key-value data. |
| //! |
| //! Spans and events may be annotated with key-value data, referred to as known |
| //! as _fields_. These fields consist of a mapping from a key (corresponding to |
| //! a `&str` but represented internally as an array index) to a [`Value`]. |
| //! |
| //! # `Value`s and `Subscriber`s |
| //! |
| //! `Subscriber`s consume `Value`s as fields attached to [span]s or [`Event`]s. |
| //! The set of field keys on a given span or is defined on its [`Metadata`]. |
| //! When a span is created, it provides [`Attributes`] to the `Subscriber`'s |
| //! [`new_span`] method, containing any fields whose values were provided when |
| //! the span was created; and may call the `Subscriber`'s [`record`] method |
| //! with additional [`Record`]s if values are added for more of its fields. |
| //! Similarly, the [`Event`] type passed to the subscriber's [`event`] method |
| //! will contain any fields attached to each event. |
| //! |
| //! `tracing` represents values as either one of a set of Rust primitives |
| //! (`i64`, `u64`, `f64`, `i128`, `u128`, `bool`, and `&str`) or using a |
| //! `fmt::Display` or `fmt::Debug` implementation. `Subscriber`s are provided |
| //! these primitive value types as `dyn Value` trait objects. |
| //! |
| //! These trait objects can be formatted using `fmt::Debug`, but may also be |
| //! recorded as typed data by calling the [`Value::record`] method on these |
| //! trait objects with a _visitor_ implementing the [`Visit`] trait. This trait |
| //! represents the behavior used to record values of various types. For example, |
| //! an implementation of `Visit` might record integers by incrementing counters |
| //! for their field names rather than printing them. |
| //! |
| //! |
| //! # Using `valuable` |
| //! |
| //! `tracing`'s [`Value`] trait is intentionally minimalist: it supports only a small |
| //! number of Rust primitives as typed values, and only permits recording |
| //! user-defined types with their [`fmt::Debug`] or [`fmt::Display`] |
| //! implementations. However, there are some cases where it may be useful to record |
| //! nested values (such as arrays, `Vec`s, or `HashMap`s containing values), or |
| //! user-defined `struct` and `enum` types without having to format them as |
| //! unstructured text. |
| //! |
| //! To address `Value`'s limitations, `tracing` offers experimental support for |
| //! the [`valuable`] crate, which provides object-safe inspection of structured |
| //! values. User-defined types can implement the [`valuable::Valuable`] trait, |
| //! and be recorded as a `tracing` field by calling their [`as_value`] method. |
| //! If the [`Subscriber`] also supports the `valuable` crate, it can |
| //! then visit those types fields as structured values using `valuable`. |
| //! |
| //! <pre class="ignore" style="white-space:normal;font:inherit;"> |
| //! <strong>Note</strong>: <code>valuable</code> support is an |
| //! <a href = "../index.html#unstable-features">unstable feature</a>. See |
| //! the documentation on unstable features for details on how to enable it. |
| //! </pre> |
| //! |
| //! For example: |
| //! ```ignore |
| //! // Derive `Valuable` for our types: |
| //! use valuable::Valuable; |
| //! |
| //! #[derive(Clone, Debug, Valuable)] |
| //! struct User { |
| //! name: String, |
| //! age: u32, |
| //! address: Address, |
| //! } |
| //! |
| //! #[derive(Clone, Debug, Valuable)] |
| //! struct Address { |
| //! country: String, |
| //! city: String, |
| //! street: String, |
| //! } |
| //! |
| //! let user = User { |
| //! name: "Arwen Undomiel".to_string(), |
| //! age: 3000, |
| //! address: Address { |
| //! country: "Middle Earth".to_string(), |
| //! city: "Rivendell".to_string(), |
| //! street: "leafy lane".to_string(), |
| //! }, |
| //! }; |
| //! |
| //! // Recording `user` as a `valuable::Value` will allow the `tracing` subscriber |
| //! // to traverse its fields as a nested, typed structure: |
| //! tracing::info!(current_user = user.as_value()); |
| //! ``` |
| //! |
| //! Alternatively, the [`valuable()`] function may be used to convert a type |
| //! implementing [`Valuable`] into a `tracing` field value. |
| //! |
| //! When the `valuable` feature is enabled, the [`Visit`] trait will include an |
| //! optional [`record_value`] method. `Visit` implementations that wish to |
| //! record `valuable` values can implement this method with custom behavior. |
| //! If a visitor does not implement `record_value`, the [`valuable::Value`] will |
| //! be forwarded to the visitor's [`record_debug`] method. |
| //! |
| //! [`valuable`]: https://crates.io/crates/valuable |
| //! [`as_value`]: valuable::Valuable::as_value |
| //! [`Subscriber`]: crate::Subscriber |
| //! [`record_value`]: Visit::record_value |
| //! [`record_debug`]: Visit::record_debug |
| //! |
| //! [span]: super::span |
| //! [`Event`]: super::event::Event |
| //! [`Metadata`]: super::metadata::Metadata |
| //! [`Attributes`]: super::span::Attributes |
| //! [`Record`]: super::span::Record |
| //! [`new_span`]: super::subscriber::Subscriber::new_span |
| //! [`record`]: super::subscriber::Subscriber::record |
| //! [`event`]: super::subscriber::Subscriber::event |
| //! [`Value::record`]: Value::record |
| </span><span class="kw">use </span><span class="kw">crate</span>::callsite; |
| <span class="kw">use </span><span class="kw">crate</span>::stdlib::{ |
| borrow::Borrow, |
| fmt, |
| hash::{Hash, Hasher}, |
| num, |
| ops::Range, |
| string::String, |
| }; |
| |
| <span class="kw">use </span><span class="self">self</span>::private::ValidLen; |
| |
| <span class="doccomment">/// An opaque key allowing _O_(1) access to a field in a `Span`'s key-value |
| /// data. |
| /// |
| /// As keys are defined by the _metadata_ of a span, rather than by an |
| /// individual instance of a span, a key may be used to access the same field |
| /// across all instances of a given span with the same metadata. Thus, when a |
| /// subscriber observes a new span, it need only access a field by name _once_, |
| /// and use the key for that name for all other accesses. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Field { |
| i: usize, |
| fields: FieldSet, |
| } |
| |
| <span class="doccomment">/// An empty field. |
| /// |
| /// This can be used to indicate that the value of a field is not currently |
| /// present but will be recorded later. |
| /// |
| /// When a field's value is `Empty`. it will not be recorded. |
| </span><span class="attribute">#[derive(Debug, Eq, PartialEq)] |
| </span><span class="kw">pub struct </span>Empty; |
| |
| <span class="doccomment">/// Describes the fields present on a span. |
| /// |
| /// ## Equality |
| /// |
| /// In well-behaved applications, two `FieldSet`s [initialized] with equal |
| /// [callsite identifiers] will have identical fields. Consequently, in release |
| /// builds, [`FieldSet::eq`] *only* checks that its arguments have equal |
| /// callsites. However, the equality of field names is checked in debug builds. |
| /// |
| /// [initialized]: Self::new |
| /// [callsite identifiers]: callsite::Identifier |
| </span><span class="kw">pub struct </span>FieldSet { |
| <span class="doccomment">/// The names of each field on the described span. |
| </span>names: <span class="kw-2">&</span><span class="lifetime">'static </span>[<span class="kw-2">&</span><span class="lifetime">'static </span>str], |
| <span class="doccomment">/// The callsite where the described span originates. |
| </span>callsite: callsite::Identifier, |
| } |
| |
| <span class="doccomment">/// A set of fields and values for a span. |
| </span><span class="kw">pub struct </span>ValueSet<<span class="lifetime">'a</span>> { |
| values: <span class="kw-2">&</span><span class="lifetime">'a </span>[(<span class="kw-2">&</span><span class="lifetime">'a </span>Field, <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>(<span class="kw">dyn </span>Value + <span class="lifetime">'a</span>)>)], |
| fields: <span class="kw-2">&</span><span class="lifetime">'a </span>FieldSet, |
| } |
| |
| <span class="doccomment">/// An iterator over a set of fields. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Iter { |
| idxs: Range<usize>, |
| fields: FieldSet, |
| } |
| |
| <span class="doccomment">/// Visits typed values. |
| /// |
| /// An instance of `Visit` ("a visitor") represents the logic necessary to |
| /// record field values of various types. When an implementor of [`Value`] is |
| /// [recorded], it calls the appropriate method on the provided visitor to |
| /// indicate the type that value should be recorded as. |
| /// |
| /// When a [`Subscriber`] implementation [records an `Event`] or a |
| /// [set of `Value`s added to a `Span`], it can pass an `&mut Visit` to the |
| /// `record` method on the provided [`ValueSet`] or [`Event`]. This visitor |
| /// will then be used to record all the field-value pairs present on that |
| /// `Event` or `ValueSet`. |
| /// |
| /// # Examples |
| /// |
| /// A simple visitor that writes to a string might be implemented like so: |
| /// ``` |
| /// # extern crate tracing_core as tracing; |
| /// use std::fmt::{self, Write}; |
| /// use tracing::field::{Value, Visit, Field}; |
| /// pub struct StringVisitor<'a> { |
| /// string: &'a mut String, |
| /// } |
| /// |
| /// impl<'a> Visit for StringVisitor<'a> { |
| /// fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) { |
| /// write!(self.string, "{} = {:?}; ", field.name(), value).unwrap(); |
| /// } |
| /// } |
| /// ``` |
| /// This visitor will format each recorded value using `fmt::Debug`, and |
| /// append the field name and formatted value to the provided string, |
| /// regardless of the type of the recorded value. When all the values have |
| /// been recorded, the `StringVisitor` may be dropped, allowing the string |
| /// to be printed or stored in some other data structure. |
| /// |
| /// The `Visit` trait provides default implementations for `record_i64`, |
| /// `record_u64`, `record_bool`, `record_str`, and `record_error`, which simply |
| /// forward the recorded value to `record_debug`. Thus, `record_debug` is the |
| /// only method which a `Visit` implementation *must* implement. However, |
| /// visitors may override the default implementations of these functions in |
| /// order to implement type-specific behavior. |
| /// |
| /// Additionally, when a visitor receives a value of a type it does not care |
| /// about, it is free to ignore those values completely. For example, a |
| /// visitor which only records numeric data might look like this: |
| /// |
| /// ``` |
| /// # extern crate tracing_core as tracing; |
| /// # use std::fmt::{self, Write}; |
| /// # use tracing::field::{Value, Visit, Field}; |
| /// pub struct SumVisitor { |
| /// sum: i64, |
| /// } |
| /// |
| /// impl Visit for SumVisitor { |
| /// fn record_i64(&mut self, _field: &Field, value: i64) { |
| /// self.sum += value; |
| /// } |
| /// |
| /// fn record_u64(&mut self, _field: &Field, value: u64) { |
| /// self.sum += value as i64; |
| /// } |
| /// |
| /// fn record_debug(&mut self, _field: &Field, _value: &fmt::Debug) { |
| /// // Do nothing |
| /// } |
| /// } |
| /// ``` |
| /// |
| /// This visitor (which is probably not particularly useful) keeps a running |
| /// sum of all the numeric values it records, and ignores all other values. A |
| /// more practical example of recording typed values is presented in |
| /// `examples/counters.rs`, which demonstrates a very simple metrics system |
| /// implemented using `tracing`. |
| /// |
| /// <div class="example-wrap" style="display:inline-block"> |
| /// <pre class="ignore" style="white-space:normal;font:inherit;"> |
| /// <strong>Note</strong>: The <code>record_error</code> trait method is only |
| /// available when the Rust standard library is present, as it requires the |
| /// <code>std::error::Error</code> trait. |
| /// </pre></div> |
| /// |
| /// [recorded]: Value::record |
| /// [`Subscriber`]: super::subscriber::Subscriber |
| /// [records an `Event`]: super::subscriber::Subscriber::event |
| /// [set of `Value`s added to a `Span`]: super::subscriber::Subscriber::record |
| /// [`Event`]: super::event::Event |
| </span><span class="kw">pub trait </span>Visit { |
| <span class="doccomment">/// Visits an arbitrary type implementing the [`valuable`] crate's `Valuable` trait. |
| /// |
| /// [`valuable`]: https://docs.rs/valuable |
| </span><span class="attribute">#[cfg(all(tracing_unstable, feature = <span class="string">"valuable"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all(tracing_unstable, feature = <span class="string">"valuable"</span>))))] |
| </span><span class="kw">fn </span>record_value(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: valuable::Value<<span class="lifetime">'_</span>>) { |
| <span class="self">self</span>.record_debug(field, <span class="kw-2">&</span>value) |
| } |
| |
| <span class="doccomment">/// Visit a double-precision floating point value. |
| </span><span class="kw">fn </span>record_f64(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: f64) { |
| <span class="self">self</span>.record_debug(field, <span class="kw-2">&</span>value) |
| } |
| |
| <span class="doccomment">/// Visit a signed 64-bit integer value. |
| </span><span class="kw">fn </span>record_i64(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: i64) { |
| <span class="self">self</span>.record_debug(field, <span class="kw-2">&</span>value) |
| } |
| |
| <span class="doccomment">/// Visit an unsigned 64-bit integer value. |
| </span><span class="kw">fn </span>record_u64(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: u64) { |
| <span class="self">self</span>.record_debug(field, <span class="kw-2">&</span>value) |
| } |
| |
| <span class="doccomment">/// Visit a signed 128-bit integer value. |
| </span><span class="kw">fn </span>record_i128(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: i128) { |
| <span class="self">self</span>.record_debug(field, <span class="kw-2">&</span>value) |
| } |
| |
| <span class="doccomment">/// Visit an unsigned 128-bit integer value. |
| </span><span class="kw">fn </span>record_u128(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: u128) { |
| <span class="self">self</span>.record_debug(field, <span class="kw-2">&</span>value) |
| } |
| |
| <span class="doccomment">/// Visit a boolean value. |
| </span><span class="kw">fn </span>record_bool(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: bool) { |
| <span class="self">self</span>.record_debug(field, <span class="kw-2">&</span>value) |
| } |
| |
| <span class="doccomment">/// Visit a string value. |
| </span><span class="kw">fn </span>record_str(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: <span class="kw-2">&</span>str) { |
| <span class="self">self</span>.record_debug(field, <span class="kw-2">&</span>value) |
| } |
| |
| <span class="doccomment">/// Records a type implementing `Error`. |
| /// |
| /// <div class="example-wrap" style="display:inline-block"> |
| /// <pre class="ignore" style="white-space:normal;font:inherit;"> |
| /// <strong>Note</strong>: This is only enabled when the Rust standard library is |
| /// present. |
| /// </pre> |
| /// </div> |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| </span><span class="kw">fn </span>record_error(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: <span class="kw-2">&</span>(<span class="kw">dyn </span>std::error::Error + <span class="lifetime">'static</span>)) { |
| <span class="self">self</span>.record_debug(field, <span class="kw-2">&</span>DisplayValue(value)) |
| } |
| |
| <span class="doccomment">/// Visit a value implementing `fmt::Debug`. |
| </span><span class="kw">fn </span>record_debug(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: <span class="kw-2">&</span><span class="kw">dyn </span>fmt::Debug); |
| } |
| |
| <span class="doccomment">/// A field value of an erased type. |
| /// |
| /// Implementors of `Value` may call the appropriate typed recording methods on |
| /// the [visitor] passed to their `record` method in order to indicate how |
| /// their data should be recorded. |
| /// |
| /// [visitor]: Visit |
| </span><span class="kw">pub trait </span>Value: <span class="kw">crate</span>::sealed::Sealed { |
| <span class="doccomment">/// Visits this value with the given `Visitor`. |
| </span><span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit); |
| } |
| |
| <span class="doccomment">/// A `Value` which serializes using `fmt::Display`. |
| /// |
| /// Uses `record_debug` in the `Value` implementation to |
| /// avoid an unnecessary evaluation. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>DisplayValue<T: fmt::Display>(T); |
| |
| <span class="doccomment">/// A `Value` which serializes as a string using `fmt::Debug`. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>DebugValue<T: fmt::Debug>(T); |
| |
| <span class="doccomment">/// Wraps a type implementing `fmt::Display` as a `Value` that can be |
| /// recorded using its `Display` implementation. |
| </span><span class="kw">pub fn </span>display<T>(t: T) -> DisplayValue<T> |
| <span class="kw">where |
| </span>T: fmt::Display, |
| { |
| DisplayValue(t) |
| } |
| |
| <span class="doccomment">/// Wraps a type implementing `fmt::Debug` as a `Value` that can be |
| /// recorded using its `Debug` implementation. |
| </span><span class="kw">pub fn </span>debug<T>(t: T) -> DebugValue<T> |
| <span class="kw">where |
| </span>T: fmt::Debug, |
| { |
| DebugValue(t) |
| } |
| |
| <span class="doccomment">/// Wraps a type implementing [`Valuable`] as a `Value` that |
| /// can be recorded using its `Valuable` implementation. |
| /// |
| /// [`Valuable`]: https://docs.rs/valuable/latest/valuable/trait.Valuable.html |
| </span><span class="attribute">#[cfg(all(tracing_unstable, feature = <span class="string">"valuable"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all(tracing_unstable, feature = <span class="string">"valuable"</span>))))] |
| </span><span class="kw">pub fn </span>valuable<T>(t: <span class="kw-2">&</span>T) -> valuable::Value<<span class="lifetime">'_</span>> |
| <span class="kw">where |
| </span>T: valuable::Valuable, |
| { |
| t.as_value() |
| } |
| |
| <span class="comment">// ===== impl Visit ===== |
| |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>, <span class="lifetime">'b</span>> Visit <span class="kw">for </span>fmt::DebugStruct<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>> { |
| <span class="kw">fn </span>record_debug(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: <span class="kw-2">&</span><span class="kw">dyn </span>fmt::Debug) { |
| <span class="self">self</span>.field(field.name(), value); |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, <span class="lifetime">'b</span>> Visit <span class="kw">for </span>fmt::DebugMap<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>> { |
| <span class="kw">fn </span>record_debug(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: <span class="kw-2">&</span><span class="kw">dyn </span>fmt::Debug) { |
| <span class="self">self</span>.entry(<span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, field), value); |
| } |
| } |
| |
| <span class="kw">impl</span><F> Visit <span class="kw">for </span>F |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&</span>Field, <span class="kw-2">&</span><span class="kw">dyn </span>fmt::Debug), |
| { |
| <span class="kw">fn </span>record_debug(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, value: <span class="kw-2">&</span><span class="kw">dyn </span>fmt::Debug) { |
| (<span class="self">self</span>)(field, value) |
| } |
| } |
| |
| <span class="comment">// ===== impl Value ===== |
| |
| </span><span class="macro">macro_rules! </span>impl_values { |
| ( $( <span class="macro-nonterminal">$record</span>:ident( $( <span class="macro-nonterminal">$whatever</span>:tt)+ ) ),+ ) => { |
| $( |
| <span class="macro">impl_value!</span>{ <span class="macro-nonterminal">$record</span>( $( <span class="macro-nonterminal">$whatever </span>)+ ) } |
| )+ |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>ty_to_nonzero { |
| (u8) => { |
| NonZeroU8 |
| }; |
| (u16) => { |
| NonZeroU16 |
| }; |
| (u32) => { |
| NonZeroU32 |
| }; |
| (u64) => { |
| NonZeroU64 |
| }; |
| (u128) => { |
| NonZeroU128 |
| }; |
| (usize) => { |
| NonZeroUsize |
| }; |
| (i8) => { |
| NonZeroI8 |
| }; |
| (i16) => { |
| NonZeroI16 |
| }; |
| (i32) => { |
| NonZeroI32 |
| }; |
| (i64) => { |
| NonZeroI64 |
| }; |
| (i128) => { |
| NonZeroI128 |
| }; |
| (isize) => { |
| NonZeroIsize |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>impl_one_value { |
| (f32, <span class="macro-nonterminal">$op</span>:expr, <span class="macro-nonterminal">$record</span>:ident) => { |
| <span class="macro">impl_one_value!</span>(normal, f32, <span class="macro-nonterminal">$op</span>, <span class="macro-nonterminal">$record</span>); |
| }; |
| (f64, <span class="macro-nonterminal">$op</span>:expr, <span class="macro-nonterminal">$record</span>:ident) => { |
| <span class="macro">impl_one_value!</span>(normal, f64, <span class="macro-nonterminal">$op</span>, <span class="macro-nonterminal">$record</span>); |
| }; |
| (bool, <span class="macro-nonterminal">$op</span>:expr, <span class="macro-nonterminal">$record</span>:ident) => { |
| <span class="macro">impl_one_value!</span>(normal, bool, <span class="macro-nonterminal">$op</span>, <span class="macro-nonterminal">$record</span>); |
| }; |
| (<span class="macro-nonterminal">$value_ty</span>:tt, <span class="macro-nonterminal">$op</span>:expr, <span class="macro-nonterminal">$record</span>:ident) => { |
| <span class="macro">impl_one_value!</span>(normal, <span class="macro-nonterminal">$value_ty</span>, <span class="macro-nonterminal">$op</span>, <span class="macro-nonterminal">$record</span>); |
| <span class="macro">impl_one_value!</span>(nonzero, <span class="macro-nonterminal">$value_ty</span>, <span class="macro-nonterminal">$op</span>, <span class="macro-nonterminal">$record</span>); |
| }; |
| (normal, <span class="macro-nonterminal">$value_ty</span>:tt, <span class="macro-nonterminal">$op</span>:expr, <span class="macro-nonterminal">$record</span>:ident) => { |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::sealed::Sealed </span><span class="kw">for </span><span class="macro-nonterminal">$value_ty </span>{} |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::field::Value </span><span class="kw">for </span><span class="macro-nonterminal">$value_ty </span>{ |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span><span class="macro-nonterminal">$crate::field::Field</span>, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span><span class="macro-nonterminal">$crate::field::Visit</span>) { |
| visitor.<span class="macro-nonterminal">$record</span>(key, <span class="macro-nonterminal">$op</span>(<span class="kw-2">*</span><span class="self">self</span>)) |
| } |
| } |
| }; |
| (nonzero, <span class="macro-nonterminal">$value_ty</span>:tt, <span class="macro-nonterminal">$op</span>:expr, <span class="macro-nonterminal">$record</span>:ident) => { |
| <span class="comment">// This `use num::*;` is reported as unused because it gets emitted |
| // for every single invocation of this macro, so there are multiple `use`s. |
| // All but the first are useless indeed. |
| // We need this import because we can't write a path where one part is |
| // the `ty_to_nonzero!($value_ty)` invocation. |
| </span><span class="attribute">#[allow(clippy::useless_attribute, unused)] |
| </span><span class="kw">use </span>num::<span class="kw-2">*</span>; |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::sealed::Sealed </span><span class="kw">for </span><span class="macro">ty_to_nonzero!</span>(<span class="macro-nonterminal">$value_ty</span>) {} |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::field::Value </span><span class="kw">for </span><span class="macro">ty_to_nonzero!</span>(<span class="macro-nonterminal">$value_ty</span>) { |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span><span class="macro-nonterminal">$crate::field::Field</span>, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span><span class="macro-nonterminal">$crate::field::Visit</span>) { |
| visitor.<span class="macro-nonterminal">$record</span>(key, <span class="macro-nonterminal">$op</span>(<span class="self">self</span>.get())) |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>impl_value { |
| ( <span class="macro-nonterminal">$record</span>:ident( $( <span class="macro-nonterminal">$value_ty</span>:tt ),+ ) ) => { |
| $( |
| <span class="macro">impl_one_value!</span>(<span class="macro-nonterminal">$value_ty</span>, |this: <span class="macro-nonterminal">$value_ty</span>| this, <span class="macro-nonterminal">$record</span>); |
| )+ |
| }; |
| ( <span class="macro-nonterminal">$record</span>:ident( $( <span class="macro-nonterminal">$value_ty</span>:tt ),+ <span class="kw">as </span><span class="macro-nonterminal">$as_ty</span>:ty) ) => { |
| $( |
| <span class="macro">impl_one_value!</span>(<span class="macro-nonterminal">$value_ty</span>, |this: <span class="macro-nonterminal">$value_ty</span>| this <span class="kw">as </span><span class="macro-nonterminal">$as_ty</span>, <span class="macro-nonterminal">$record</span>); |
| )+ |
| }; |
| } |
| |
| <span class="comment">// ===== impl Value ===== |
| |
| </span><span class="macro">impl_values! </span>{ |
| record_u64(u64), |
| record_u64(usize, u32, u16, u8 <span class="kw">as </span>u64), |
| record_i64(i64), |
| record_i64(isize, i32, i16, i8 <span class="kw">as </span>i64), |
| record_u128(u128), |
| record_i128(i128), |
| record_bool(bool), |
| record_f64(f64, f32 <span class="kw">as </span>f64) |
| } |
| |
| <span class="kw">impl</span><T: <span class="kw">crate</span>::sealed::Sealed> <span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span>Wrapping<T> {} |
| <span class="kw">impl</span><T: <span class="kw">crate</span>::field::Value> <span class="kw">crate</span>::field::Value <span class="kw">for </span>Wrapping<T> { |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span><span class="kw">crate</span>::field::Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span><span class="kw">crate</span>::field::Visit) { |
| <span class="self">self</span>.<span class="number">0</span>.record(key, visitor) |
| } |
| } |
| |
| <span class="kw">impl </span><span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span>str {} |
| |
| <span class="kw">impl </span>Value <span class="kw">for </span>str { |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| visitor.record_str(key, <span class="self">self</span>) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl </span><span class="kw">crate</span>::sealed::Sealed <span class="kw">for dyn </span>std::error::Error + <span class="lifetime">'static </span>{} |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| </span><span class="kw">impl </span>Value <span class="kw">for dyn </span>std::error::Error + <span class="lifetime">'static </span>{ |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| visitor.record_error(key, <span class="self">self</span>) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl </span><span class="kw">crate</span>::sealed::Sealed <span class="kw">for dyn </span>std::error::Error + Send + <span class="lifetime">'static </span>{} |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| </span><span class="kw">impl </span>Value <span class="kw">for dyn </span>std::error::Error + Send + <span class="lifetime">'static </span>{ |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| (<span class="self">self </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>std::error::Error).record(key, visitor) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl </span><span class="kw">crate</span>::sealed::Sealed <span class="kw">for dyn </span>std::error::Error + Sync + <span class="lifetime">'static </span>{} |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| </span><span class="kw">impl </span>Value <span class="kw">for dyn </span>std::error::Error + Sync + <span class="lifetime">'static </span>{ |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| (<span class="self">self </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>std::error::Error).record(key, visitor) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl </span><span class="kw">crate</span>::sealed::Sealed <span class="kw">for dyn </span>std::error::Error + Send + Sync + <span class="lifetime">'static </span>{} |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| </span><span class="kw">impl </span>Value <span class="kw">for dyn </span>std::error::Error + Send + Sync + <span class="lifetime">'static </span>{ |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| (<span class="self">self </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>std::error::Error).record(key, visitor) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T: <span class="question-mark">?</span>Sized> <span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>T <span class="kw">where </span>T: Value + <span class="kw">crate</span>::sealed::Sealed + <span class="lifetime">'a </span>{} |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T: <span class="question-mark">?</span>Sized> Value <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>T |
| <span class="kw">where |
| </span>T: Value + <span class="lifetime">'a</span>, |
| { |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| (<span class="kw-2">*</span><span class="self">self</span>).record(key, visitor) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T: <span class="question-mark">?</span>Sized> <span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T <span class="kw">where </span>T: Value + <span class="kw">crate</span>::sealed::Sealed + <span class="lifetime">'a </span>{} |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T: <span class="question-mark">?</span>Sized> Value <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T |
| <span class="kw">where |
| </span>T: Value + <span class="lifetime">'a</span>, |
| { |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| <span class="comment">// Don't use `(*self).record(key, visitor)`, otherwise would |
| // cause stack overflow due to `unconditional_recursion`. |
| </span>T::record(<span class="self">self</span>, key, visitor) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> <span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span>fmt::Arguments<<span class="lifetime">'a</span>> {} |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Value <span class="kw">for </span>fmt::Arguments<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| visitor.record_debug(key, <span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> <span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span><span class="kw">crate</span>::stdlib::boxed::Box<T> <span class="kw">where </span>T: Value {} |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> Value <span class="kw">for </span><span class="kw">crate</span>::stdlib::boxed::Box<T> |
| <span class="kw">where |
| </span>T: Value, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| <span class="self">self</span>.as_ref().record(key, visitor) |
| } |
| } |
| |
| <span class="kw">impl </span><span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span>String {} |
| <span class="kw">impl </span>Value <span class="kw">for </span>String { |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| visitor.record_str(key, <span class="self">self</span>.as_str()) |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for dyn </span>Value { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="comment">// We are only going to be recording the field value, so we don't |
| // actually care about the field name here. |
| </span><span class="kw">struct </span>NullCallsite; |
| <span class="kw">static </span>NULL_CALLSITE: NullCallsite = NullCallsite; |
| <span class="kw">impl </span><span class="kw">crate</span>::callsite::Callsite <span class="kw">for </span>NullCallsite { |
| <span class="kw">fn </span>set_interest(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw">crate</span>::subscriber::Interest) { |
| <span class="macro">unreachable!</span>(<span class="string">"you somehow managed to register the null callsite?"</span>) |
| } |
| |
| <span class="kw">fn </span>metadata(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="kw">crate</span>::Metadata<<span class="lifetime">'_</span>> { |
| <span class="macro">unreachable!</span>(<span class="string">"you somehow managed to access the null callsite?"</span>) |
| } |
| } |
| |
| <span class="kw">static </span>FIELD: Field = Field { |
| i: <span class="number">0</span>, |
| fields: FieldSet::new(<span class="kw-2">&</span>[], <span class="macro">crate::identify_callsite!</span>(<span class="kw-2">&</span>NULL_CALLSITE)), |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>res = <span class="prelude-val">Ok</span>(()); |
| <span class="self">self</span>.record(<span class="kw-2">&</span>FIELD, <span class="kw-2">&mut </span>|<span class="kw">_</span>: <span class="kw-2">&</span>Field, val: <span class="kw-2">&</span><span class="kw">dyn </span>fmt::Debug| { |
| res = <span class="macro">write!</span>(f, <span class="string">"{:?}"</span>, val); |
| }); |
| res |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for dyn </span>Value { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| fmt::Debug::fmt(<span class="self">self</span>, f) |
| } |
| } |
| |
| <span class="comment">// ===== impl DisplayValue ===== |
| |
| </span><span class="kw">impl</span><T: fmt::Display> <span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span>DisplayValue<T> {} |
| |
| <span class="kw">impl</span><T> Value <span class="kw">for </span>DisplayValue<T> |
| <span class="kw">where |
| </span>T: fmt::Display, |
| { |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| visitor.record_debug(key, <span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T: fmt::Display> fmt::Debug <span class="kw">for </span>DisplayValue<T> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| fmt::Display::fmt(<span class="self">self</span>, f) |
| } |
| } |
| |
| <span class="kw">impl</span><T: fmt::Display> fmt::Display <span class="kw">for </span>DisplayValue<T> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="self">self</span>.<span class="number">0</span>.fmt(f) |
| } |
| } |
| |
| <span class="comment">// ===== impl DebugValue ===== |
| |
| </span><span class="kw">impl</span><T: fmt::Debug> <span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span>DebugValue<T> {} |
| |
| <span class="kw">impl</span><T> Value <span class="kw">for </span>DebugValue<T> |
| <span class="kw">where |
| </span>T: fmt::Debug, |
| { |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| visitor.record_debug(key, <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T: fmt::Debug> fmt::Debug <span class="kw">for </span>DebugValue<T> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="self">self</span>.<span class="number">0</span>.fmt(f) |
| } |
| } |
| |
| <span class="comment">// ===== impl ValuableValue ===== |
| |
| </span><span class="attribute">#[cfg(all(tracing_unstable, feature = <span class="string">"valuable"</span>))] |
| </span><span class="kw">impl </span><span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span>valuable::Value<<span class="lifetime">'_</span>> {} |
| |
| <span class="attribute">#[cfg(all(tracing_unstable, feature = <span class="string">"valuable"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all(tracing_unstable, feature = <span class="string">"valuable"</span>))))] |
| </span><span class="kw">impl </span>Value <span class="kw">for </span>valuable::Value<<span class="lifetime">'_</span>> { |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| visitor.record_value(key, <span class="kw-2">*</span><span class="self">self</span>) |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(tracing_unstable, feature = <span class="string">"valuable"</span>))] |
| </span><span class="kw">impl </span><span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'_ </span><span class="kw">dyn </span>valuable::Valuable {} |
| |
| <span class="attribute">#[cfg(all(tracing_unstable, feature = <span class="string">"valuable"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all(tracing_unstable, feature = <span class="string">"valuable"</span>))))] |
| </span><span class="kw">impl </span>Value <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'_ </span><span class="kw">dyn </span>valuable::Valuable { |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| visitor.record_value(key, <span class="self">self</span>.as_value()) |
| } |
| } |
| |
| <span class="kw">impl </span><span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span>Empty {} |
| <span class="kw">impl </span>Value <span class="kw">for </span>Empty { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span>Field, <span class="kw">_</span>: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) {} |
| } |
| |
| <span class="kw">impl</span><T: Value> <span class="kw">crate</span>::sealed::Sealed <span class="kw">for </span><span class="prelude-ty">Option</span><T> {} |
| |
| <span class="kw">impl</span><T: Value> Value <span class="kw">for </span><span class="prelude-ty">Option</span><T> { |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>Field, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = <span class="kw-2">&</span><span class="self">self </span>{ |
| v.record(key, visitor) |
| } |
| } |
| } |
| |
| <span class="comment">// ===== impl Field ===== |
| |
| </span><span class="kw">impl </span>Field { |
| <span class="doccomment">/// Returns an [`Identifier`] that uniquely identifies the [`Callsite`] |
| /// which defines this field. |
| /// |
| /// [`Identifier`]: super::callsite::Identifier |
| /// [`Callsite`]: super::callsite::Callsite |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>callsite(<span class="kw-2">&</span><span class="self">self</span>) -> callsite::Identifier { |
| <span class="self">self</span>.fields.callsite() |
| } |
| |
| <span class="doccomment">/// Returns a string representing the name of the field. |
| </span><span class="kw">pub fn </span>name(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'static </span>str { |
| <span class="self">self</span>.fields.names[<span class="self">self</span>.i] |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>Field { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.pad(<span class="self">self</span>.name()) |
| } |
| } |
| |
| <span class="kw">impl </span>AsRef<str> <span class="kw">for </span>Field { |
| <span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="self">self</span>.name() |
| } |
| } |
| |
| <span class="kw">impl </span>PartialEq <span class="kw">for </span>Field { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="self">self</span>.callsite() == other.callsite() && <span class="self">self</span>.i == other.i |
| } |
| } |
| |
| <span class="kw">impl </span>Eq <span class="kw">for </span>Field {} |
| |
| <span class="kw">impl </span>Hash <span class="kw">for </span>Field { |
| <span class="kw">fn </span>hash<H>(<span class="kw-2">&</span><span class="self">self</span>, state: <span class="kw-2">&mut </span>H) |
| <span class="kw">where |
| </span>H: Hasher, |
| { |
| <span class="self">self</span>.callsite().hash(state); |
| <span class="self">self</span>.i.hash(state); |
| } |
| } |
| |
| <span class="kw">impl </span>Clone <span class="kw">for </span>Field { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| Field { |
| i: <span class="self">self</span>.i, |
| fields: FieldSet { |
| names: <span class="self">self</span>.fields.names, |
| callsite: <span class="self">self</span>.fields.callsite(), |
| }, |
| } |
| } |
| } |
| |
| <span class="comment">// ===== impl FieldSet ===== |
| |
| </span><span class="kw">impl </span>FieldSet { |
| <span class="doccomment">/// Constructs a new `FieldSet` with the given array of field names and callsite. |
| </span><span class="kw">pub const fn </span>new(names: <span class="kw-2">&</span><span class="lifetime">'static </span>[<span class="kw-2">&</span><span class="lifetime">'static </span>str], callsite: callsite::Identifier) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ names, callsite } |
| } |
| |
| <span class="doccomment">/// Returns an [`Identifier`] that uniquely identifies the [`Callsite`] |
| /// which defines this set of fields.. |
| /// |
| /// [`Identifier`]: super::callsite::Identifier |
| /// [`Callsite`]: super::callsite::Callsite |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>callsite(<span class="kw-2">&</span><span class="self">self</span>) -> callsite::Identifier { |
| callsite::Identifier(<span class="self">self</span>.callsite.<span class="number">0</span>) |
| } |
| |
| <span class="doccomment">/// Returns the [`Field`] named `name`, or `None` if no such field exists. |
| /// |
| /// [`Field`]: super::Field |
| </span><span class="kw">pub fn </span>field<Q: <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, name: <span class="kw-2">&</span>Q) -> <span class="prelude-ty">Option</span><Field> |
| <span class="kw">where |
| </span>Q: Borrow<str>, |
| { |
| <span class="kw">let </span>name = <span class="kw-2">&</span>name.borrow(); |
| <span class="self">self</span>.names.iter().position(|f| f == name).map(|i| Field { |
| i, |
| fields: FieldSet { |
| names: <span class="self">self</span>.names, |
| callsite: <span class="self">self</span>.callsite(), |
| }, |
| }) |
| } |
| |
| <span class="doccomment">/// Returns `true` if `self` contains the given `field`. |
| /// |
| /// <div class="example-wrap" style="display:inline-block"> |
| /// <pre class="ignore" style="white-space:normal;font:inherit;"> |
| /// <strong>Note</strong>: If <code>field</code> shares a name with a field |
| /// in this <code>FieldSet</code>, but was created by a <code>FieldSet</code> |
| /// with a different callsite, this <code>FieldSet</code> does <em>not</em> |
| /// contain it. This is so that if two separate span callsites define a field |
| /// named "foo", the <code>Field</code> corresponding to "foo" for each |
| /// of those callsites are not equivalent. |
| /// </pre></div> |
| </span><span class="kw">pub fn </span>contains(<span class="kw-2">&</span><span class="self">self</span>, field: <span class="kw-2">&</span>Field) -> bool { |
| field.callsite() == <span class="self">self</span>.callsite() && field.i <= <span class="self">self</span>.len() |
| } |
| |
| <span class="doccomment">/// Returns an iterator over the `Field`s in this `FieldSet`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>iter(<span class="kw-2">&</span><span class="self">self</span>) -> Iter { |
| <span class="kw">let </span>idxs = <span class="number">0</span>..<span class="self">self</span>.len(); |
| Iter { |
| idxs, |
| fields: FieldSet { |
| names: <span class="self">self</span>.names, |
| callsite: <span class="self">self</span>.callsite(), |
| }, |
| } |
| } |
| |
| <span class="doccomment">/// Returns a new `ValueSet` with entries for this `FieldSet`'s values. |
| /// |
| /// Note that a `ValueSet` may not be constructed with arrays of over 32 |
| /// elements. |
| </span><span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub fn </span>value_set<<span class="lifetime">'v</span>, V>(<span class="kw-2">&</span><span class="lifetime">'v </span><span class="self">self</span>, values: <span class="kw-2">&</span><span class="lifetime">'v </span>V) -> ValueSet<<span class="lifetime">'v</span>> |
| <span class="kw">where |
| </span>V: ValidLen<<span class="lifetime">'v</span>>, |
| { |
| ValueSet { |
| fields: <span class="self">self</span>, |
| values: values.borrow(), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the number of fields in this `FieldSet`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.names.len() |
| } |
| |
| <span class="doccomment">/// Returns whether or not this `FieldSet` has fields. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.names.is_empty() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>FieldSet { |
| <span class="kw">type </span>IntoIter = Iter; |
| <span class="kw">type </span>Item = Field; |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| <span class="self">self</span>.iter() |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>FieldSet { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.debug_struct(<span class="string">"FieldSet"</span>) |
| .field(<span class="string">"names"</span>, <span class="kw-2">&</span><span class="self">self</span>.names) |
| .field(<span class="string">"callsite"</span>, <span class="kw-2">&</span><span class="self">self</span>.callsite) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>FieldSet { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.debug_set() |
| .entries(<span class="self">self</span>.names.iter().map(display)) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl </span>Eq <span class="kw">for </span>FieldSet {} |
| |
| <span class="kw">impl </span>PartialEq <span class="kw">for </span>FieldSet { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="kw">if </span>core::ptr::eq(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">&</span>other) { |
| <span class="bool-val">true |
| </span>} <span class="kw">else if </span><span class="macro">cfg!</span>(not(debug_assertions)) { |
| <span class="comment">// In a well-behaving application, two `FieldSet`s can be assumed to |
| // be totally equal so long as they share the same callsite. |
| </span><span class="self">self</span>.callsite == other.callsite |
| } <span class="kw">else </span>{ |
| <span class="comment">// However, when debug-assertions are enabled, do NOT assume that |
| // the application is well-behaving; check every the field names of |
| // each `FieldSet` for equality. |
| |
| // `FieldSet` is destructured here to ensure a compile-error if the |
| // fields of `FieldSet` change. |
| </span><span class="kw">let </span><span class="self">Self </span>{ |
| names: lhs_names, |
| callsite: lhs_callsite, |
| } = <span class="self">self</span>; |
| |
| <span class="kw">let </span><span class="self">Self </span>{ |
| names: rhs_names, |
| callsite: rhs_callsite, |
| } = <span class="kw-2">&</span>other; |
| |
| <span class="comment">// Check callsite equality first, as it is probably cheaper to do |
| // than str equality. |
| </span>lhs_callsite == rhs_callsite && lhs_names == rhs_names |
| } |
| } |
| } |
| |
| <span class="comment">// ===== impl Iter ===== |
| |
| </span><span class="kw">impl </span>Iterator <span class="kw">for </span>Iter { |
| <span class="kw">type </span>Item = Field; |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Field> { |
| <span class="kw">let </span>i = <span class="self">self</span>.idxs.next()<span class="question-mark">?</span>; |
| <span class="prelude-val">Some</span>(Field { |
| i, |
| fields: FieldSet { |
| names: <span class="self">self</span>.fields.names, |
| callsite: <span class="self">self</span>.fields.callsite(), |
| }, |
| }) |
| } |
| } |
| |
| <span class="comment">// ===== impl ValueSet ===== |
| |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>> ValueSet<<span class="lifetime">'a</span>> { |
| <span class="doccomment">/// Returns an [`Identifier`] that uniquely identifies the [`Callsite`] |
| /// defining the fields this `ValueSet` refers to. |
| /// |
| /// [`Identifier`]: super::callsite::Identifier |
| /// [`Callsite`]: super::callsite::Callsite |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>callsite(<span class="kw-2">&</span><span class="self">self</span>) -> callsite::Identifier { |
| <span class="self">self</span>.fields.callsite() |
| } |
| |
| <span class="doccomment">/// Visits all the fields in this `ValueSet` with the provided [visitor]. |
| /// |
| /// [visitor]: Visit |
| </span><span class="kw">pub fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, visitor: <span class="kw-2">&mut </span><span class="kw">dyn </span>Visit) { |
| <span class="kw">let </span>my_callsite = <span class="self">self</span>.callsite(); |
| <span class="kw">for </span>(field, value) <span class="kw">in </span><span class="self">self</span>.values { |
| <span class="kw">if </span>field.callsite() != my_callsite { |
| <span class="kw">continue</span>; |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(value) = value { |
| value.record(field, visitor); |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Returns the number of fields in this `ValueSet` that would be visited |
| /// by a given [visitor] to the [`ValueSet::record()`] method. |
| /// |
| /// [visitor]: Visit |
| /// [`ValueSet::record()`]: ValueSet::record() |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="kw">let </span>my_callsite = <span class="self">self</span>.callsite(); |
| <span class="self">self</span>.values |
| .iter() |
| .filter(|(field, <span class="kw">_</span>)| field.callsite() == my_callsite) |
| .count() |
| } |
| |
| <span class="doccomment">/// Returns `true` if this `ValueSet` contains a value for the given `Field`. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>contains(<span class="kw-2">&</span><span class="self">self</span>, field: <span class="kw-2">&</span>Field) -> bool { |
| field.callsite() == <span class="self">self</span>.callsite() |
| && <span class="self">self |
| </span>.values |
| .iter() |
| .any(|(key, val)| <span class="kw-2">*</span>key == field && val.is_some()) |
| } |
| |
| <span class="doccomment">/// Returns true if this `ValueSet` contains _no_ values. |
| </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">let </span>my_callsite = <span class="self">self</span>.callsite(); |
| <span class="self">self</span>.values |
| .iter() |
| .all(|(key, val)| val.is_none() || key.callsite() != my_callsite) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>field_set(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>FieldSet { |
| <span class="self">self</span>.fields |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> fmt::Debug <span class="kw">for </span>ValueSet<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="self">self</span>.values |
| .iter() |
| .fold(<span class="kw-2">&mut </span>f.debug_struct(<span class="string">"ValueSet"</span>), |dbg, (key, v)| { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(val) = v { |
| val.record(key, dbg); |
| } |
| dbg |
| }) |
| .field(<span class="string">"callsite"</span>, <span class="kw-2">&</span><span class="self">self</span>.callsite()) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> fmt::Display <span class="kw">for </span>ValueSet<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="self">self</span>.values |
| .iter() |
| .fold(<span class="kw-2">&mut </span>f.debug_map(), |dbg, (key, v)| { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(val) = v { |
| val.record(key, dbg); |
| } |
| dbg |
| }) |
| .finish() |
| } |
| } |
| |
| <span class="comment">// ===== impl ValidLen ===== |
| |
| </span><span class="kw">mod </span>private { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// Marker trait implemented by arrays which are of valid length to |
| /// construct a `ValueSet`. |
| /// |
| /// `ValueSet`s may only be constructed from arrays containing 32 or fewer |
| /// elements, to ensure the array is small enough to always be allocated on the |
| /// stack. This trait is only implemented by arrays of an appropriate length, |
| /// ensuring that the correct size arrays are used at compile-time. |
| </span><span class="kw">pub trait </span>ValidLen<<span class="lifetime">'a</span>>: Borrow<[(<span class="kw-2">&</span><span class="lifetime">'a </span>Field, <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>(<span class="kw">dyn </span>Value + <span class="lifetime">'a</span>)>)]> {} |
| } |
| |
| <span class="macro">macro_rules! </span>impl_valid_len { |
| ( $( <span class="macro-nonterminal">$len</span>:tt ),+ ) => { |
| $( |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> private::ValidLen<<span class="lifetime">'a</span>> <span class="kw">for |
| </span>[(<span class="kw-2">&</span><span class="lifetime">'a </span>Field, <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>(<span class="kw">dyn </span>Value + <span class="lifetime">'a</span>)>); <span class="macro-nonterminal">$len</span>] {} |
| )+ |
| } |
| } |
| |
| <span class="macro">impl_valid_len! </span>{ |
| <span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>, <span class="number">12</span>, <span class="number">13</span>, <span class="number">14</span>, <span class="number">15</span>, <span class="number">16</span>, <span class="number">17</span>, <span class="number">18</span>, <span class="number">19</span>, <span class="number">20</span>, |
| <span class="number">21</span>, <span class="number">22</span>, <span class="number">23</span>, <span class="number">24</span>, <span class="number">25</span>, <span class="number">26</span>, <span class="number">27</span>, <span class="number">28</span>, <span class="number">29</span>, <span class="number">30</span>, <span class="number">31</span>, <span class="number">32 |
| </span>} |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>test { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::metadata::{Kind, Level, Metadata}; |
| <span class="kw">use </span><span class="kw">crate</span>::stdlib::{borrow::ToOwned, string::String}; |
| |
| <span class="kw">struct </span>TestCallsite1; |
| <span class="kw">static </span>TEST_CALLSITE_1: TestCallsite1 = TestCallsite1; |
| <span class="kw">static </span>TEST_META_1: Metadata<<span class="lifetime">'static</span>> = <span class="macro">metadata! </span>{ |
| name: <span class="string">"field_test1"</span>, |
| target: <span class="macro">module_path!</span>(), |
| level: Level::INFO, |
| fields: <span class="kw-2">&</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>, <span class="string">"baz"</span>], |
| callsite: <span class="kw-2">&</span>TEST_CALLSITE_1, |
| kind: Kind::SPAN, |
| }; |
| |
| <span class="kw">impl </span><span class="kw">crate</span>::callsite::Callsite <span class="kw">for </span>TestCallsite1 { |
| <span class="kw">fn </span>set_interest(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw">crate</span>::subscriber::Interest) { |
| <span class="macro">unimplemented!</span>() |
| } |
| |
| <span class="kw">fn </span>metadata(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Metadata<<span class="lifetime">'_</span>> { |
| <span class="kw-2">&</span>TEST_META_1 |
| } |
| } |
| |
| <span class="kw">struct </span>TestCallsite2; |
| <span class="kw">static </span>TEST_CALLSITE_2: TestCallsite2 = TestCallsite2; |
| <span class="kw">static </span>TEST_META_2: Metadata<<span class="lifetime">'static</span>> = <span class="macro">metadata! </span>{ |
| name: <span class="string">"field_test2"</span>, |
| target: <span class="macro">module_path!</span>(), |
| level: Level::INFO, |
| fields: <span class="kw-2">&</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>, <span class="string">"baz"</span>], |
| callsite: <span class="kw-2">&</span>TEST_CALLSITE_2, |
| kind: Kind::SPAN, |
| }; |
| |
| <span class="kw">impl </span><span class="kw">crate</span>::callsite::Callsite <span class="kw">for </span>TestCallsite2 { |
| <span class="kw">fn </span>set_interest(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw">crate</span>::subscriber::Interest) { |
| <span class="macro">unimplemented!</span>() |
| } |
| |
| <span class="kw">fn </span>metadata(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Metadata<<span class="lifetime">'_</span>> { |
| <span class="kw-2">&</span>TEST_META_2 |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>value_set_with_no_values_is_empty() { |
| <span class="kw">let </span>fields = TEST_META_1.fields(); |
| <span class="kw">let </span>values = <span class="kw-2">&</span>[ |
| (<span class="kw-2">&</span>fields.field(<span class="string">"foo"</span>).unwrap(), <span class="prelude-val">None</span>), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"bar"</span>).unwrap(), <span class="prelude-val">None</span>), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"baz"</span>).unwrap(), <span class="prelude-val">None</span>), |
| ]; |
| <span class="kw">let </span>valueset = fields.value_set(values); |
| <span class="macro">assert!</span>(valueset.is_empty()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>empty_value_set_is_empty() { |
| <span class="kw">let </span>fields = TEST_META_1.fields(); |
| <span class="kw">let </span>valueset = fields.value_set(<span class="kw-2">&</span>[]); |
| <span class="macro">assert!</span>(valueset.is_empty()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>value_sets_with_fields_from_other_callsites_are_empty() { |
| <span class="kw">let </span>fields = TEST_META_1.fields(); |
| <span class="kw">let </span>values = <span class="kw-2">&</span>[ |
| (<span class="kw-2">&</span>fields.field(<span class="string">"foo"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1 </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"bar"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">2 </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"baz"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">3 </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| ]; |
| <span class="kw">let </span>valueset = TEST_META_2.fields().value_set(values); |
| <span class="macro">assert!</span>(valueset.is_empty()) |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>sparse_value_sets_are_not_empty() { |
| <span class="kw">let </span>fields = TEST_META_1.fields(); |
| <span class="kw">let </span>values = <span class="kw-2">&</span>[ |
| (<span class="kw-2">&</span>fields.field(<span class="string">"foo"</span>).unwrap(), <span class="prelude-val">None</span>), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"bar"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">57 </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"baz"</span>).unwrap(), <span class="prelude-val">None</span>), |
| ]; |
| <span class="kw">let </span>valueset = fields.value_set(values); |
| <span class="macro">assert!</span>(!valueset.is_empty()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>fields_from_other_callsets_are_skipped() { |
| <span class="kw">let </span>fields = TEST_META_1.fields(); |
| <span class="kw">let </span>values = <span class="kw-2">&</span>[ |
| (<span class="kw-2">&</span>fields.field(<span class="string">"foo"</span>).unwrap(), <span class="prelude-val">None</span>), |
| ( |
| <span class="kw-2">&</span>TEST_META_2.fields().field(<span class="string">"bar"</span>).unwrap(), |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">57 </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value), |
| ), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"baz"</span>).unwrap(), <span class="prelude-val">None</span>), |
| ]; |
| |
| <span class="kw">struct </span>MyVisitor; |
| <span class="kw">impl </span>Visit <span class="kw">for </span>MyVisitor { |
| <span class="kw">fn </span>record_debug(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, <span class="kw">_</span>: <span class="kw-2">&</span><span class="kw">dyn </span>(<span class="kw">crate</span>::stdlib::fmt::Debug)) { |
| <span class="macro">assert_eq!</span>(field.callsite(), TEST_META_1.callsite()) |
| } |
| } |
| <span class="kw">let </span>valueset = fields.value_set(values); |
| valueset.record(<span class="kw-2">&mut </span>MyVisitor); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>empty_fields_are_skipped() { |
| <span class="kw">let </span>fields = TEST_META_1.fields(); |
| <span class="kw">let </span>values = <span class="kw-2">&</span>[ |
| (<span class="kw-2">&</span>fields.field(<span class="string">"foo"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>Empty <span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"bar"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">57 </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"baz"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>Empty <span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| ]; |
| |
| <span class="kw">struct </span>MyVisitor; |
| <span class="kw">impl </span>Visit <span class="kw">for </span>MyVisitor { |
| <span class="kw">fn </span>record_debug(<span class="kw-2">&mut </span><span class="self">self</span>, field: <span class="kw-2">&</span>Field, <span class="kw">_</span>: <span class="kw-2">&</span><span class="kw">dyn </span>(<span class="kw">crate</span>::stdlib::fmt::Debug)) { |
| <span class="macro">assert_eq!</span>(field.name(), <span class="string">"bar"</span>) |
| } |
| } |
| <span class="kw">let </span>valueset = fields.value_set(values); |
| valueset.record(<span class="kw-2">&mut </span>MyVisitor); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>record_debug_fn() { |
| <span class="kw">let </span>fields = TEST_META_1.fields(); |
| <span class="kw">let </span>values = <span class="kw-2">&</span>[ |
| (<span class="kw-2">&</span>fields.field(<span class="string">"foo"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1 </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"bar"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">2 </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"baz"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">3 </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| ]; |
| <span class="kw">let </span>valueset = fields.value_set(values); |
| <span class="kw">let </span><span class="kw-2">mut </span>result = String::new(); |
| valueset.record(<span class="kw-2">&mut </span>|<span class="kw">_</span>: <span class="kw-2">&</span>Field, value: <span class="kw-2">&</span><span class="kw">dyn </span>fmt::Debug| { |
| <span class="kw">use </span><span class="kw">crate</span>::stdlib::fmt::Write; |
| <span class="macro">write!</span>(<span class="kw-2">&mut </span>result, <span class="string">"{:?}"</span>, value).unwrap(); |
| }); |
| <span class="macro">assert_eq!</span>(result, <span class="string">"123"</span>.to_owned()); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">fn </span>record_error() { |
| <span class="kw">let </span>fields = TEST_META_1.fields(); |
| <span class="kw">let </span>err: Box<<span class="kw">dyn </span>std::error::Error + Send + Sync + <span class="lifetime">'static</span>> = |
| std::io::Error::new(std::io::ErrorKind::Other, <span class="string">"lol"</span>).into(); |
| <span class="kw">let </span>values = <span class="kw-2">&</span>[ |
| (<span class="kw-2">&</span>fields.field(<span class="string">"foo"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>err <span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"bar"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>Empty <span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| (<span class="kw-2">&</span>fields.field(<span class="string">"baz"</span>).unwrap(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>Empty <span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Value)), |
| ]; |
| <span class="kw">let </span>valueset = fields.value_set(values); |
| <span class="kw">let </span><span class="kw-2">mut </span>result = String::new(); |
| valueset.record(<span class="kw-2">&mut </span>|<span class="kw">_</span>: <span class="kw-2">&</span>Field, value: <span class="kw-2">&</span><span class="kw">dyn </span>fmt::Debug| { |
| <span class="kw">use </span>core::fmt::Write; |
| <span class="macro">write!</span>(<span class="kw-2">&mut </span>result, <span class="string">"{:?}"</span>, value).unwrap(); |
| }); |
| <span class="macro">assert_eq!</span>(result, <span class="macro">format!</span>(<span class="string">"{}"</span>, err)); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="tracing_core" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |