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</pre><pre class="rust"><code><span class="doccomment">//! Value inspection.
//!
//! The [`Visit`] trait provides a simple visitor API that can be used to inspect
//! the structure of primitives stored in a [`ValueBag`](../struct.ValueBag.html).
//! More complex datatypes can then be handled using `std::fmt`, `sval`, or `serde`.
//!
//! ```
//! # #[cfg(not(feature = &quot;std&quot;))] fn main() {}
//! # #[cfg(feature = &quot;std&quot;)]
//! # fn main() -&gt; Result&lt;(), Box&lt;dyn std::error::Error&gt;&gt; {
//! # fn escape(buf: &amp;[u8]) -&gt; &amp;[u8] { buf }
//! # fn itoa_fmt&lt;T&gt;(num: T) -&gt; Vec&lt;u8&gt; { vec![] }
//! # fn ryu_fmt&lt;T&gt;(num: T) -&gt; Vec&lt;u8&gt; { vec![] }
//! # use std::io::Write;
//! use value_bag::{ValueBag, Error, visit::Visit};
//!
//! // Implement some simple custom serialization
//! struct MyVisit(Vec&lt;u8&gt;);
//! impl&lt;&#39;v&gt; Visit&lt;&#39;v&gt; for MyVisit {
//! fn visit_any(&amp;mut self, v: ValueBag) -&gt; Result&lt;(), Error&gt; {
//! // Fallback to `Debug` if we didn&#39;t visit the value specially
//! write!(&amp;mut self.0, &quot;{:?}&quot;, v).map_err(|_| Error::msg(&quot;failed to write value&quot;))
//! }
//!
//! fn visit_u64(&amp;mut self, v: u64) -&gt; Result&lt;(), Error&gt; {
//! self.0.extend_from_slice(itoa_fmt(v).as_slice());
//! Ok(())
//! }
//!
//! fn visit_i64(&amp;mut self, v: i64) -&gt; Result&lt;(), Error&gt; {
//! self.0.extend_from_slice(itoa_fmt(v).as_slice());
//! Ok(())
//! }
//!
//! fn visit_f64(&amp;mut self, v: f64) -&gt; Result&lt;(), Error&gt; {
//! self.0.extend_from_slice(ryu_fmt(v).as_slice());
//! Ok(())
//! }
//!
//! fn visit_str(&amp;mut self, v: &amp;str) -&gt; Result&lt;(), Error&gt; {
//! self.0.push(b&#39;\&quot;&#39;);
//! self.0.extend_from_slice(escape(v.as_bytes()));
//! self.0.push(b&#39;\&quot;&#39;);
//! Ok(())
//! }
//!
//! fn visit_bool(&amp;mut self, v: bool) -&gt; Result&lt;(), Error&gt; {
//! self.0.extend_from_slice(if v { b&quot;true&quot; } else { b&quot;false&quot; });
//! Ok(())
//! }
//! }
//!
//! let value = ValueBag::from(42i64);
//!
//! let mut visitor = MyVisit(vec![]);
//! value.visit(&amp;mut visitor)?;
//! # Ok(())
//! # }
//! ```
</span><span class="kw">use crate</span>::{
internal::{<span class="self">self</span>, InternalVisitor},
Error, ValueBag,
};
<span class="doccomment">/// A visitor for a `ValueBag`.
</span><span class="kw">pub trait </span>Visit&lt;<span class="lifetime">&#39;v</span>&gt; {
<span class="doccomment">/// Visit a `ValueBag`.
///
/// This is the only required method on `Visit` and acts as a fallback for any
/// more specific methods that aren&#39;t overridden.
/// The `ValueBag` may be formatted using its `fmt::Debug` or `fmt::Display` implementation,
/// or serialized using its `sval::Value` or `serde::Serialize` implementation.
</span><span class="kw">fn </span>visit_any(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: ValueBag) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt;;
<span class="doccomment">/// Visit an unsigned integer.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_u64(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: u64) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.visit_any(value.into())
}
<span class="doccomment">/// Visit a signed integer.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_i64(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: i64) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.visit_any(value.into())
}
<span class="doccomment">/// Visit a big unsigned integer.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_u128(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: u128) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.visit_any((<span class="kw-2">&amp;</span>value).into())
}
<span class="doccomment">/// Visit a big signed integer.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_i128(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: i128) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.visit_any((<span class="kw-2">&amp;</span>value).into())
}
<span class="doccomment">/// Visit a floating point.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_f64(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: f64) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.visit_any(value.into())
}
<span class="doccomment">/// Visit a boolean.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_bool(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: bool) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.visit_any(value.into())
}
<span class="doccomment">/// Visit a string.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.visit_any(value.into())
}
<span class="doccomment">/// Visit a string.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_borrowed_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: <span class="kw-2">&amp;</span><span class="lifetime">&#39;v </span>str) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.visit_str(value)
}
<span class="doccomment">/// Visit a Unicode character.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_char(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: char) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>b = [<span class="number">0</span>; <span class="number">4</span>];
<span class="self">self</span>.visit_str(<span class="kw-2">&amp;*</span>value.encode_utf8(<span class="kw-2">&amp;mut </span>b))
}
<span class="doccomment">/// Visit an error.
</span><span class="attribute">#[inline]
#[cfg(feature = <span class="string">&quot;error&quot;</span>)]
</span><span class="kw">fn </span>visit_error(<span class="kw-2">&amp;mut </span><span class="self">self</span>, err: <span class="kw-2">&amp;</span>(<span class="kw">dyn </span><span class="kw">crate</span>::std::error::Error + <span class="lifetime">&#39;static</span>)) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.visit_any(ValueBag::from_dyn_error(err))
}
<span class="doccomment">/// Visit an error.
</span><span class="attribute">#[inline]
#[cfg(feature = <span class="string">&quot;error&quot;</span>)]
</span><span class="kw">fn </span>visit_borrowed_error(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
err: <span class="kw-2">&amp;</span><span class="lifetime">&#39;v </span>(<span class="kw">dyn </span><span class="kw">crate</span>::std::error::Error + <span class="lifetime">&#39;static</span>),
) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.visit_any(ValueBag::from_dyn_error(err))
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;v</span>, T: <span class="question-mark">?</span>Sized&gt; Visit&lt;<span class="lifetime">&#39;v</span>&gt; <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>T
<span class="kw">where
</span>T: Visit&lt;<span class="lifetime">&#39;v</span>&gt;,
{
<span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_any(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: ValueBag) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).visit_any(value)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_u64(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: u64) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).visit_u64(value)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_i64(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: i64) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).visit_i64(value)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_u128(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: u128) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).visit_u128(value)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_i128(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: i128) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).visit_i128(value)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_f64(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: f64) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).visit_f64(value)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_bool(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: bool) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).visit_bool(value)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).visit_str(value)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_borrowed_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: <span class="kw-2">&amp;</span><span class="lifetime">&#39;v </span>str) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).visit_borrowed_str(value)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>visit_char(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: char) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).visit_char(value)
}
<span class="attribute">#[inline]
#[cfg(feature = <span class="string">&quot;error&quot;</span>)]
</span><span class="kw">fn </span>visit_error(<span class="kw-2">&amp;mut </span><span class="self">self</span>, err: <span class="kw-2">&amp;</span>(<span class="kw">dyn </span><span class="kw">crate</span>::std::error::Error + <span class="lifetime">&#39;static</span>)) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).visit_error(err)
}
<span class="attribute">#[inline]
#[cfg(feature = <span class="string">&quot;error&quot;</span>)]
</span><span class="kw">fn </span>visit_borrowed_error(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
err: <span class="kw-2">&amp;</span><span class="lifetime">&#39;v </span>(<span class="kw">dyn </span><span class="kw">crate</span>::std::error::Error + <span class="lifetime">&#39;static</span>),
) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).visit_borrowed_error(err)
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;v</span>&gt; ValueBag&lt;<span class="lifetime">&#39;v</span>&gt; {
<span class="doccomment">/// Visit this value using a simple visitor.
///
/// The visitor isn&#39;t strictly required to inspect the contents of a value bag.
/// It&#39;s useful for simple cases where a full framework like `serde` or `sval`
/// isn&#39;t necessary.
</span><span class="kw">pub fn </span>visit(<span class="kw-2">&amp;</span><span class="self">self</span>, visitor: <span class="kw">impl </span>Visit&lt;<span class="lifetime">&#39;v</span>&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="kw">struct </span>Visitor&lt;V&gt;(V);
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;v</span>, V&gt; InternalVisitor&lt;<span class="lifetime">&#39;v</span>&gt; <span class="kw">for </span>Visitor&lt;V&gt;
<span class="kw">where
</span>V: Visit&lt;<span class="lifetime">&#39;v</span>&gt;,
{
<span class="kw">fn </span>debug(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: <span class="kw-2">&amp;</span><span class="kw">dyn </span>internal::fmt::Debug) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_any(ValueBag::from_dyn_debug(v))
}
<span class="kw">fn </span>display(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: <span class="kw-2">&amp;</span><span class="kw">dyn </span>internal::fmt::Display) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_any(ValueBag::from_dyn_display(v))
}
<span class="kw">fn </span>u64(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: u64) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_u64(v)
}
<span class="kw">fn </span>i64(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: i64) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_i64(v)
}
<span class="kw">fn </span>u128(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: <span class="kw-2">&amp;</span>u128) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_u128(<span class="kw-2">*</span>v)
}
<span class="kw">fn </span>i128(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: <span class="kw-2">&amp;</span>i128) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_i128(<span class="kw-2">*</span>v)
}
<span class="kw">fn </span>f64(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: f64) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_f64(v)
}
<span class="kw">fn </span>bool(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: bool) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_bool(v)
}
<span class="kw">fn </span>char(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: char) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_char(v)
}
<span class="kw">fn </span>str(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_str(v)
}
<span class="kw">fn </span>borrowed_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: <span class="kw-2">&amp;</span><span class="lifetime">&#39;v </span>str) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_borrowed_str(v)
}
<span class="kw">fn </span>none(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_any(ValueBag::from(()))
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;error&quot;</span>)]
</span><span class="kw">fn </span>error(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: <span class="kw-2">&amp;</span>(<span class="kw">dyn </span>internal::error::Error + <span class="lifetime">&#39;static</span>)) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_error(v)
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;error&quot;</span>)]
</span><span class="kw">fn </span>borrowed_error(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
v: <span class="kw-2">&amp;</span><span class="lifetime">&#39;v </span>(<span class="kw">dyn </span>internal::error::Error + <span class="lifetime">&#39;static</span>),
) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="self">self</span>.<span class="number">0</span>.visit_borrowed_error(v)
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;sval2&quot;</span>)]
</span><span class="kw">fn </span>sval2(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: <span class="kw-2">&amp;</span><span class="kw">dyn </span>internal::sval::v2::Value) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
internal::sval::v2::internal_visit(v, <span class="self">self</span>)
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;sval2&quot;</span>)]
</span><span class="kw">fn </span>borrowed_sval2(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
v: <span class="kw-2">&amp;</span><span class="lifetime">&#39;v </span><span class="kw">dyn </span>internal::sval::v2::Value,
) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
internal::sval::v2::borrowed_internal_visit(v, <span class="self">self</span>)
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;serde1&quot;</span>)]
</span><span class="kw">fn </span>serde1(<span class="kw-2">&amp;mut </span><span class="self">self</span>, v: <span class="kw-2">&amp;</span><span class="kw">dyn </span>internal::serde::v1::Serialize) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
internal::serde::v1::internal_visit(v, <span class="self">self</span>)
}
}
<span class="self">self</span>.internal_visit(<span class="kw-2">&amp;mut </span>Visitor(visitor))
}
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use super</span>::<span class="kw-2">*</span>;
<span class="kw">use </span><span class="kw">crate</span>::test::<span class="kw-2">*</span>;
<span class="attribute">#[test]
</span><span class="kw">fn </span>visit_structured() {
ValueBag::from(<span class="number">42u64</span>)
.visit(TestVisit::default())
.expect(<span class="string">&quot;failed to visit value&quot;</span>);
ValueBag::from(-<span class="number">42i64</span>)
.visit(TestVisit::default())
.expect(<span class="string">&quot;failed to visit value&quot;</span>);
ValueBag::from(<span class="kw-2">&amp;</span><span class="number">42u128</span>)
.visit(TestVisit::default())
.expect(<span class="string">&quot;failed to visit value&quot;</span>);
ValueBag::from(<span class="kw-2">&amp;</span>-<span class="number">42i128</span>)
.visit(TestVisit::default())
.expect(<span class="string">&quot;failed to visit value&quot;</span>);
ValueBag::from(<span class="number">11f64</span>)
.visit(TestVisit::default())
.expect(<span class="string">&quot;failed to visit value&quot;</span>);
ValueBag::from(<span class="bool-val">true</span>)
.visit(TestVisit::default())
.expect(<span class="string">&quot;failed to visit value&quot;</span>);
ValueBag::from(<span class="string">&quot;some borrowed string&quot;</span>)
.visit(TestVisit::default())
.expect(<span class="string">&quot;failed to visit value&quot;</span>);
ValueBag::from(<span class="string">&#39;n&#39;</span>)
.visit(TestVisit::default())
.expect(<span class="string">&quot;failed to visit value&quot;</span>);
}
}
</code></pre></div>
</section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="value_bag" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>