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<p class='location'>Trait Visitor</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Output">Output</a><a href="#associatedtype.Err">Err</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.finish">finish</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.start">start</a><a href="#method.visit_pre">visit_pre</a><a href="#method.visit_post">visit_post</a><a href="#method.visit_alternation_in">visit_alternation_in</a><a href="#method.visit_class_set_item_pre">visit_class_set_item_pre</a><a href="#method.visit_class_set_item_post">visit_class_set_item_post</a><a href="#method.visit_class_set_binary_op_pre">visit_class_set_binary_op_pre</a><a href="#method.visit_class_set_binary_op_post">visit_class_set_binary_op_post</a><a href="#method.visit_class_set_binary_op_in">visit_class_set_binary_op_in</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>regex_syntax</a>::<wbr><a href='index.html'>ast</a></p><script>window.sidebarCurrent = {name: 'Visitor', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>regex_syntax</a>::<wbr><a href='index.html'>ast</a>::<wbr><a class="trait" href=''>Visitor</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../../src/regex_syntax/ast/visitor.rs.html#33-112' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust trait'>pub trait Visitor {
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type <a href='#associatedtype.Output' class="type">Output</a>;
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type <a href='#associatedtype.Err' class="type">Err</a>;
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fn <a href='#tymethod.finish' class='fnname'>finish</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Output" title="type regex_syntax::ast::Visitor::Output">Output</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>>;
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fn <a href='#method.start' class='fnname'>start</a>(&mut self) { ... }
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<div class='item-spacer'></div> fn <a href='#method.visit_pre' class='fnname'>visit_pre</a>(&mut self, _ast: &<a class="enum" href="../../regex_syntax/ast/enum.Ast.html" title="enum regex_syntax::ast::Ast">Ast</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<div class='item-spacer'></div> fn <a href='#method.visit_post' class='fnname'>visit_post</a>(&mut self, _ast: &<a class="enum" href="../../regex_syntax/ast/enum.Ast.html" title="enum regex_syntax::ast::Ast">Ast</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<div class='item-spacer'></div> fn <a href='#method.visit_alternation_in' class='fnname'>visit_alternation_in</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<div class='item-spacer'></div> fn <a href='#method.visit_class_set_item_pre' class='fnname'>visit_class_set_item_pre</a>(<br> &mut self, <br> _ast: &<a class="enum" href="../../regex_syntax/ast/enum.ClassSetItem.html" title="enum regex_syntax::ast::ClassSetItem">ClassSetItem</a><br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<div class='item-spacer'></div> fn <a href='#method.visit_class_set_item_post' class='fnname'>visit_class_set_item_post</a>(<br> &mut self, <br> _ast: &<a class="enum" href="../../regex_syntax/ast/enum.ClassSetItem.html" title="enum regex_syntax::ast::ClassSetItem">ClassSetItem</a><br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<div class='item-spacer'></div> fn <a href='#method.visit_class_set_binary_op_pre' class='fnname'>visit_class_set_binary_op_pre</a>(<br> &mut self, <br> _ast: &<a class="struct" href="../../regex_syntax/ast/struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp">ClassSetBinaryOp</a><br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<div class='item-spacer'></div> fn <a href='#method.visit_class_set_binary_op_post' class='fnname'>visit_class_set_binary_op_post</a>(<br> &mut self, <br> _ast: &<a class="struct" href="../../regex_syntax/ast/struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp">ClassSetBinaryOp</a><br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<div class='item-spacer'></div> fn <a href='#method.visit_class_set_binary_op_in' class='fnname'>visit_class_set_binary_op_in</a>(<br> &mut self, <br> _ast: &<a class="struct" href="../../regex_syntax/ast/struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp">ClassSetBinaryOp</a><br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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}</pre></div><div class='docblock'><p>A trait for visiting an abstract syntax tree (AST) in depth first order.</p>
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<p>The principle aim of this trait is to enable callers to perform case
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analysis on an abstract syntax tree without necessarily using recursion.
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In particular, this permits callers to do case analysis with constant stack
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usage, which can be important since the size of an abstract syntax tree
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may be proportional to end user input.</p>
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<p>Typical usage of this trait involves providing an implementation and then
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running it using the <a href="fn.visit.html"><code>visit</code></a> function.</p>
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<p>Note that the abstract syntax tree for a regular expression is quite
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complex. Unless you specifically need it, you might be able to use the
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much simpler
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<a href="../hir/struct.Hir.html">high-level intermediate representation</a>
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and its
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<a href="../hir/trait.Visitor.html">corresponding <code>Visitor</code> trait</a>
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instead.</p>
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</div>
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<h2 id='associated-types' class='small-section-header'>
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Associated Types<a href='#associated-types' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='associatedtype.Output' class='method'><span id='Output.t' class='invisible'><code>type <a href='#associatedtype.Output' class="type">Output</a></code></span></h3><div class='docblock'><p>The result of visiting an AST.</p>
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</div><h3 id='associatedtype.Err' class='method'><span id='Err.t' class='invisible'><code>type <a href='#associatedtype.Err' class="type">Err</a></code></span></h3><div class='docblock'><p>An error that visiting an AST might return.</p>
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</div></div>
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<h2 id='required-methods' class='small-section-header'>
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Required Methods<a href='#required-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='tymethod.finish' class='method'><span id='finish.v' class='invisible'><code>fn <a href='#tymethod.finish' class='fnname'>finish</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Output" title="type regex_syntax::ast::Visitor::Output">Output</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></code></span></h3><div class='docblock'><p>All implementors of <code>Visitor</code> must provide a <code>finish</code> method, which
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yields the result of visiting the AST or an error.</p>
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</div></div>
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<h2 id='provided-methods' class='small-section-header'>
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Provided Methods<a href='#provided-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='method.start' class='method'><span id='start.v' class='invisible'><code>fn <a href='#method.start' class='fnname'>start</a>(&mut self)</code></span></h3><div class='docblock'><p>This method is called before beginning traversal of the AST.</p>
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</div><h3 id='method.visit_pre' class='method'><span id='visit_pre.v' class='invisible'><code>fn <a href='#method.visit_pre' class='fnname'>visit_pre</a>(&mut self, _ast: &<a class="enum" href="../../regex_syntax/ast/enum.Ast.html" title="enum regex_syntax::ast::Ast">Ast</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></code></span></h3><div class='docblock'><p>This method is called on an <code>Ast</code> before descending into child <code>Ast</code>
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||
nodes.</p>
|
||
</div><h3 id='method.visit_post' class='method'><span id='visit_post.v' class='invisible'><code>fn <a href='#method.visit_post' class='fnname'>visit_post</a>(&mut self, _ast: &<a class="enum" href="../../regex_syntax/ast/enum.Ast.html" title="enum regex_syntax::ast::Ast">Ast</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></code></span></h3><div class='docblock'><p>This method is called on an <code>Ast</code> after descending all of its child
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<code>Ast</code> nodes.</p>
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</div><h3 id='method.visit_alternation_in' class='method'><span id='visit_alternation_in.v' class='invisible'><code>fn <a href='#method.visit_alternation_in' class='fnname'>visit_alternation_in</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></code></span></h3><div class='docblock'><p>This method is called between child nodes of an
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<a href="struct.Alternation.html"><code>Alternation</code></a>.</p>
|
||
</div><h3 id='method.visit_class_set_item_pre' class='method'><span id='visit_class_set_item_pre.v' class='invisible'><code>fn <a href='#method.visit_class_set_item_pre' class='fnname'>visit_class_set_item_pre</a>(<br> &mut self, <br> _ast: &<a class="enum" href="../../regex_syntax/ast/enum.ClassSetItem.html" title="enum regex_syntax::ast::ClassSetItem">ClassSetItem</a><br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></code></span></h3><div class='docblock'><p>This method is called on every
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<a href="enum.ClassSetItem.html"><code>ClassSetItem</code></a>
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before descending into child nodes.</p>
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||
</div><h3 id='method.visit_class_set_item_post' class='method'><span id='visit_class_set_item_post.v' class='invisible'><code>fn <a href='#method.visit_class_set_item_post' class='fnname'>visit_class_set_item_post</a>(<br> &mut self, <br> _ast: &<a class="enum" href="../../regex_syntax/ast/enum.ClassSetItem.html" title="enum regex_syntax::ast::ClassSetItem">ClassSetItem</a><br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></code></span></h3><div class='docblock'><p>This method is called on every
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||
<a href="enum.ClassSetItem.html"><code>ClassSetItem</code></a>
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after descending into child nodes.</p>
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||
</div><h3 id='method.visit_class_set_binary_op_pre' class='method'><span id='visit_class_set_binary_op_pre.v' class='invisible'><code>fn <a href='#method.visit_class_set_binary_op_pre' class='fnname'>visit_class_set_binary_op_pre</a>(<br> &mut self, <br> _ast: &<a class="struct" href="../../regex_syntax/ast/struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp">ClassSetBinaryOp</a><br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></code></span></h3><div class='docblock'><p>This method is called on every
|
||
<a href="struct.ClassSetBinaryOp.html"><code>ClassSetBinaryOp</code></a>
|
||
before descending into child nodes.</p>
|
||
</div><h3 id='method.visit_class_set_binary_op_post' class='method'><span id='visit_class_set_binary_op_post.v' class='invisible'><code>fn <a href='#method.visit_class_set_binary_op_post' class='fnname'>visit_class_set_binary_op_post</a>(<br> &mut self, <br> _ast: &<a class="struct" href="../../regex_syntax/ast/struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp">ClassSetBinaryOp</a><br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></code></span></h3><div class='docblock'><p>This method is called on every
|
||
<a href="struct.ClassSetBinaryOp.html"><code>ClassSetBinaryOp</code></a>
|
||
after descending into child nodes.</p>
|
||
</div><h3 id='method.visit_class_set_binary_op_in' class='method'><span id='visit_class_set_binary_op_in.v' class='invisible'><code>fn <a href='#method.visit_class_set_binary_op_in' class='fnname'>visit_class_set_binary_op_in</a>(<br> &mut self, <br> _ast: &<a class="struct" href="../../regex_syntax/ast/struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp">ClassSetBinaryOp</a><br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/ast/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></code></span></h3><div class='docblock'><p>This method is called between the left hand and right hand child nodes
|
||
of a <a href="struct.ClassSetBinaryOp.html"><code>ClassSetBinaryOp</code></a>.</p>
|
||
</div></div>
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Implementors<a href='#implementors' class='anchor'></a>
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Prefix searches with a type followed by a colon (e.g.
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Accepted types are: <code>fn</code>, <code>mod</code>,
|
||
<code>struct</code>, <code>enum</code>,
|
||
<code>trait</code>, <code>type</code>, <code>macro</code>,
|
||
and <code>const</code>.
|
||
</p>
|
||
|
||
<p>
|
||
Search functions by type signature (e.g.
|
||
<code>vec -> usize</code> or <code>* -> vec</code>)
|
||
</p>
|
||
</div>
|
||
</div>
|
||
</aside>
|
||
|
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|
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|
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