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<p class='location'>Trait Automaton</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.State">State</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.start">start</a><a href="#tymethod.is_match">is_match</a><a href="#tymethod.accept">accept</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.can_match">can_match</a><a href="#method.will_always_match">will_always_match</a><a href="#method.starts_with">starts_with</a><a href="#method.union">union</a><a href="#method.intersection">intersection</a><a href="#method.complement">complement</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-Automaton">&'a T</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>fst</a>::<wbr><a href='index.html'>automaton</a></p><script>window.sidebarCurrent = {name: 'Automaton', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>fst</a>::<wbr><a href='index.html'>automaton</a>::<wbr><a class="trait" href=''>Automaton</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/fst/automaton/mod.rs.html#24-96' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait Automaton {
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type <a href='#associatedtype.State' class="type">State</a>;
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fn <a href='#tymethod.start' class='fnname'>start</a>(&self) -> Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>;
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<div class='item-spacer'></div> fn <a href='#tymethod.is_match' class='fnname'>is_match</a>(&self, state: &Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>;
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<div class='item-spacer'></div> fn <a href='#tymethod.accept' class='fnname'>accept</a>(&self, state: &Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>, byte: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>) -> Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>;
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fn <a href='#method.can_match' class='fnname'>can_match</a>(&self, _state: &Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a> { ... }
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<div class='item-spacer'></div> fn <a href='#method.will_always_match' class='fnname'>will_always_match</a>(&self, _state: &Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a> { ... }
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<div class='item-spacer'></div> fn <a href='#method.starts_with' class='fnname'>starts_with</a>(self) -> <a class="struct" href="../../fst/automaton/struct.StartsWith.html" title="struct fst::automaton::StartsWith">StartsWith</a><Self><br> <span class="where">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a></span>,
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{ ... }
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<div class='item-spacer'></div> fn <a href='#method.union' class='fnname'>union</a><Rhs: <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a>>(self, rhs: Rhs) -> <a class="struct" href="../../fst/automaton/struct.Union.html" title="struct fst::automaton::Union">Union</a><Self, Rhs><br> <span class="where">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a></span>,
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{ ... }
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<div class='item-spacer'></div> fn <a href='#method.intersection' class='fnname'>intersection</a><Rhs: <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a>>(self, rhs: Rhs) -> <a class="struct" href="../../fst/automaton/struct.Intersection.html" title="struct fst::automaton::Intersection">Intersection</a><Self, Rhs><br> <span class="where">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a></span>,
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{ ... }
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<div class='item-spacer'></div> fn <a href='#method.complement' class='fnname'>complement</a>(self) -> <a class="struct" href="../../fst/automaton/struct.Complement.html" title="struct fst::automaton::Complement">Complement</a><Self><br> <span class="where">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a></span>,
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{ ... }
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}</pre><div class='docblock'><p>Automaton describes types that behave as a finite automaton.</p>
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<p>All implementors of this trait are represented by <em>byte based</em> automata.
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Stated differently, all transitions in the automata correspond to a single
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byte in the input.</p>
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<p>This implementation choice is important for a couple reasons:</p>
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<ol>
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<li>The set of possible transitions in each node is small, which may make
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efficient memory usage easier.</li>
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<li>The finite state transducers in this crate are all byte based, so any
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automata used on them must also be byte based.</li>
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</ol>
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<p>In practice, this does present somewhat of a problem, for example, if
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you're storing UTF-8 encoded strings in a finite state transducer. Consider
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using a <code>Levenshtein</code> automaton, which accepts a query string and an edit
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distance. The edit distance should apply to some notion of <em>character</em>,
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which could be represented by at least 1-4 bytes in a UTF-8 encoding (for
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some definition of "character"). Therefore, the automaton must have UTF-8
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decoding built into it. This can be tricky to implement, so you may find
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the <a href="https://crates.io/crates/utf8-ranges"><code>utf8-ranges</code></a> crate useful.</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.State' class='method'><span id='State.t' class='invisible'><code>type <a href='#associatedtype.State' class="type">State</a></code></span></h3><div class='docblock'><p>The type of the state used in the automaton.</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.start' class='method'><span id='start.v' class='invisible'><code>fn <a href='#tymethod.start' class='fnname'>start</a>(&self) -> Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a></code></span></h3><div class='docblock'><p>Returns a single start state for this automaton.</p>
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<p>This method should always return the same value for each
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implementation.</p>
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</div><h3 id='tymethod.is_match' class='method'><span id='is_match.v' class='invisible'><code>fn <a href='#tymethod.is_match' class='fnname'>is_match</a>(&self, state: &Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></h3><div class='docblock'><p>Returns true if and only if <code>state</code> is a match state.</p>
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</div><h3 id='tymethod.accept' class='method'><span id='accept.v' class='invisible'><code>fn <a href='#tymethod.accept' class='fnname'>accept</a>(&self, state: &Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>, byte: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>) -> Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a></code></span></h3><div class='docblock'><p>Return the next state given <code>state</code> and an input.</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.can_match' class='method'><span id='can_match.v' class='invisible'><code>fn <a href='#method.can_match' class='fnname'>can_match</a>(&self, _state: &Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></h3><div class='docblock'><p>Returns true if and only if <code>state</code> can lead to a match in zero or more
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steps.</p>
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<p>If this returns <code>false</code>, then no sequence of inputs from this state
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should ever produce a match. If this does not follow, then those match
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states may never be reached. In other words, behavior may be incorrect.</p>
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<p>If this returns <code>true</code> even when no match is possible, then behavior
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will be correct, but callers may be forced to do additional work.</p>
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</div><h3 id='method.will_always_match' class='method'><span id='will_always_match.v' class='invisible'><code>fn <a href='#method.will_always_match' class='fnname'>will_always_match</a>(&self, _state: &Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></h3><div class='docblock'><p>Returns true if and only if <code>state</code> matches and must match no matter
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||
what steps are taken.</p>
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<p>If this returns <code>true</code>, then every sequence of inputs from this state
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produces a match. If this does not follow, then those match states may
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||
never be reached. In other words, behavior may be incorrect.</p>
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<p>If this returns <code>false</code> even when every sequence of inputs will lead to
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a match, then behavior will be correct, but callers may be forced to do
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additional work.</p>
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</div><h3 id='method.starts_with' class='method'><span id='starts_with.v' class='invisible'><code>fn <a href='#method.starts_with' class='fnname'>starts_with</a>(self) -> <a class="struct" href="../../fst/automaton/struct.StartsWith.html" title="struct fst::automaton::StartsWith">StartsWith</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code></span></h3><div class='docblock'><p>Returns an automaton that matches the strings that start with something
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this automaton matches.</p>
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||
</div><h3 id='method.union' class='method'><span id='union.v' class='invisible'><code>fn <a href='#method.union' class='fnname'>union</a><Rhs: <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a>>(self, rhs: Rhs) -> <a class="struct" href="../../fst/automaton/struct.Union.html" title="struct fst::automaton::Union">Union</a><Self, Rhs> <span class="where fmt-newline">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code></span></h3><div class='docblock'><p>Returns an automaton that matches the strings matched by either this or
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||
the other automaton.</p>
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</div><h3 id='method.intersection' class='method'><span id='intersection.v' class='invisible'><code>fn <a href='#method.intersection' class='fnname'>intersection</a><Rhs: <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a>>(self, rhs: Rhs) -> <a class="struct" href="../../fst/automaton/struct.Intersection.html" title="struct fst::automaton::Intersection">Intersection</a><Self, Rhs> <span class="where fmt-newline">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code></span></h3><div class='docblock'><p>Returns an automaton that matches the strings matched by both this and
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||
the other automaton.</p>
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||
</div><h3 id='method.complement' class='method'><span id='complement.v' class='invisible'><code>fn <a href='#method.complement' class='fnname'>complement</a>(self) -> <a class="struct" href="../../fst/automaton/struct.Complement.html" title="struct fst::automaton::Complement">Complement</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code></span></h3><div class='docblock'><p>Returns an automaton that matches the strings not matched by this
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automaton.</p>
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||
</div></div>
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<h2 id='foreign-impls' class='small-section-header'>
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||
Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
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</h2>
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||
<h3 id='impl-Automaton' class='impl'><span class='in-band'><code>impl<'a, T: <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a>> <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a </a>T</code><a href='#impl-Automaton' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/automaton/mod.rs.html#98-120' title='goto source code'>[src]</a></span></h3>
|
||
<span class='docblock autohide'><div class='impl-items'><h4 id='associatedtype.State-1' class="type"><span id='State.t-1' class='invisible'><code>type <a href='#associatedtype.State' class="type">State</a> = T::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a></code></span></h4>
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||
<h4 id='method.start' class="method"><span id='start.v-1' class='invisible'><code>fn <a href='#method.start' class='fnname'>start</a>(&self) -> Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/automaton/mod.rs.html#101-103' title='goto source code'>[src]</a></span></h4>
|
||
<h4 id='method.is_match' class="method"><span id='is_match.v-1' class='invisible'><code>fn <a href='#method.is_match' class='fnname'>is_match</a>(&self, state: &Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/automaton/mod.rs.html#105-107' title='goto source code'>[src]</a></span></h4>
|
||
<h4 id='method.can_match-1' class="method"><span id='can_match.v-1' class='invisible'><code>fn <a href='#method.can_match' class='fnname'>can_match</a>(&self, state: &Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/automaton/mod.rs.html#109-111' title='goto source code'>[src]</a></span></h4>
|
||
<h4 id='method.will_always_match-1' class="method"><span id='will_always_match.v-1' class='invisible'><code>fn <a href='#method.will_always_match' class='fnname'>will_always_match</a>(&self, state: &Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/automaton/mod.rs.html#113-115' title='goto source code'>[src]</a></span></h4>
|
||
<h4 id='method.accept' class="method"><span id='accept.v-1' class='invisible'><code>fn <a href='#method.accept' class='fnname'>accept</a>(&self, state: &Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a>, byte: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>) -> Self::<a class="type" href="../../fst/automaton/trait.Automaton.html#associatedtype.State" title="type fst::automaton::Automaton::State">State</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/automaton/mod.rs.html#117-119' title='goto source code'>[src]</a></span></h4>
|
||
<h4 id='method.starts_with-1' class="method"><span id='starts_with.v-1' class='invisible'><code>fn <a href='../../fst/automaton/trait.Automaton.html#method.starts_with' class='fnname'>starts_with</a>(self) -> <a class="struct" href="../../fst/automaton/struct.StartsWith.html" title="struct fst::automaton::StartsWith">StartsWith</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/automaton/mod.rs.html#69-71' title='goto source code'>[src]</a></span></h4>
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||
<h4 id='method.union-1' class="method"><span id='union.v-1' class='invisible'><code>fn <a href='../../fst/automaton/trait.Automaton.html#method.union' class='fnname'>union</a><Rhs: <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a>>(self, rhs: Rhs) -> <a class="struct" href="../../fst/automaton/struct.Union.html" title="struct fst::automaton::Union">Union</a><Self, Rhs> <span class="where fmt-newline">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/automaton/mod.rs.html#75-80' title='goto source code'>[src]</a></span></h4>
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<h4 id='method.complement-1' class="method"><span id='complement.v-1' class='invisible'><code>fn <a href='../../fst/automaton/trait.Automaton.html#method.complement' class='fnname'>complement</a>(self) -> <a class="struct" href="../../fst/automaton/struct.Complement.html" title="struct fst::automaton::Complement">Complement</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/automaton/mod.rs.html#93-95' title='goto source code'>[src]</a></span></h4>
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<li><div class='out-of-band'><a class='srclink' href='../../src/fst/automaton/mod.rs.html#150-203' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a>> Automaton for <a class="struct" href="../../fst/automaton/struct.StartsWith.html" title="struct fst::automaton::StartsWith">StartsWith</a><A><span class="where fmt-newline"> type <a href='#associatedtype.State' class="type">State</a> = <a class="struct" href="../../fst/automaton/struct.StartsWithState.html" title="struct fst::automaton::StartsWithState">StartsWithState</a><A>;</span></code></li>
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<li><div class='out-of-band'><a class='srclink' href='../../src/fst/automaton/mod.rs.html#211-240' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a>, B: <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a>> Automaton for <a class="struct" href="../../fst/automaton/struct.Union.html" title="struct fst::automaton::Union">Union</a><A, B><span class="where fmt-newline"> type <a href='#associatedtype.State' class="type">State</a> = <a class="struct" href="../../fst/automaton/struct.UnionState.html" title="struct fst::automaton::UnionState">UnionState</a><A, B>;</span></code></li>
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<li><div class='out-of-band'><a class='srclink' href='../../src/fst/automaton/mod.rs.html#248-280' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a>, B: <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a>> Automaton for <a class="struct" href="../../fst/automaton/struct.Intersection.html" title="struct fst::automaton::Intersection">Intersection</a><A, B><span class="where fmt-newline"> type <a href='#associatedtype.State' class="type">State</a> = <a class="struct" href="../../fst/automaton/struct.IntersectionState.html" title="struct fst::automaton::IntersectionState">IntersectionState</a><A, B>;</span></code></li>
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<li><div class='out-of-band'><a class='srclink' href='../../src/fst/automaton/mod.rs.html#288-314' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../fst/automaton/trait.Automaton.html" title="trait fst::automaton::Automaton">Automaton</a>> Automaton for <a class="struct" href="../../fst/automaton/struct.Complement.html" title="struct fst::automaton::Complement">Complement</a><A><span class="where fmt-newline"> type <a href='#associatedtype.State' class="type">State</a> = <a class="struct" href="../../fst/automaton/struct.ComplementState.html" title="struct fst::automaton::ComplementState">ComplementState</a><A>;</span></code></li>
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