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<h2>API</h2>
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<div class="docs-updated">updated: 2018-01-23 17:06</div>
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<div class="docs-body">
<div class="section" id="api">
<h1>API<a class="headerlink" href="#api" title="Permalink to this headline">¶</a></h1>
<div class="section" id="machines">
<h2>Machines<a class="headerlink" href="#machines" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="automaton.machines.State">
<em class="property">class </em><code class="descclassname">automaton.machines.</code><code class="descname">State</code><span class="sig-paren">(</span><em>name</em>, <em>is_terminal=False</em>, <em>next_states=None</em>, <em>on_enter=None</em>, <em>on_exit=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#State"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.State" title="Permalink to this definition">¶</a></dt>
<dd><p>Container that defines needed components of a single state.</p>
<p>Usage of this and the <a class="reference internal" href="#automaton.machines.FiniteMachine.build" title="automaton.machines.FiniteMachine.build"><code class="xref py py-meth docutils literal"><span class="pre">build()</span></code></a> make creating finite
state machines that much easier.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Variables:</th><td class="field-body"><ul class="first last simple">
<li><strong>name</strong> – The name of the state.</li>
<li><strong>is_terminal</strong> – Whether this state is terminal (or not).</li>
<li><strong>next_states</strong> – Dictionary of ‘event’ -> ‘next state name’ (or none).</li>
<li><strong>on_enter</strong> – callback that will be called when the state is entered.</li>
<li><strong>on_exit</strong> – callback that will be called when the state is exited.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="class">
<dt id="automaton.machines.FiniteMachine">
<em class="property">class </em><code class="descclassname">automaton.machines.</code><code class="descname">FiniteMachine</code><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine" title="Permalink to this definition">¶</a></dt>
<dd><p>A finite state machine.</p>
<p>This state machine can be used to automatically run a given set of
transitions and states in response to events (either from callbacks or from
generator/iterator send() values, see PEP 342). On each triggered event, a
<code class="docutils literal"><span class="pre">on_enter</span></code> and <code class="docutils literal"><span class="pre">on_exit</span></code> callback can also be provided which will be
called to perform some type of action on leaving a prior state and before
entering a new state.</p>
<p>NOTE(harlowja): reactions will <em>only</em> be called when the generator/iterator
from <a class="reference internal" href="#automaton.runners.Runner.run_iter" title="automaton.runners.Runner.run_iter"><code class="xref py py-meth docutils literal"><span class="pre">run_iter()</span></code></a> does <em>not</em> send
back a new event (they will always be called if the
<a class="reference internal" href="#automaton.runners.Runner.run" title="automaton.runners.Runner.run"><code class="xref py py-meth docutils literal"><span class="pre">run()</span></code></a> method is used). This allows
for two unique ways (these ways can also be intermixed) to use this state
machine when using <a class="reference internal" href="#automaton.runners.Runner.run" title="automaton.runners.Runner.run"><code class="xref py py-meth docutils literal"><span class="pre">run()</span></code></a>; one
where <em>external</em> event trigger the next state transition and one
where <em>internal</em> reaction callbacks trigger the next state
transition. The other way to use this
state machine is to skip using <a class="reference internal" href="#automaton.runners.Runner.run" title="automaton.runners.Runner.run"><code class="xref py py-meth docutils literal"><span class="pre">run()</span></code></a>
or <a class="reference internal" href="#automaton.runners.Runner.run_iter" title="automaton.runners.Runner.run_iter"><code class="xref py py-meth docutils literal"><span class="pre">run_iter()</span></code></a>
completely and use the <a class="reference internal" href="#automaton.machines.FiniteMachine.process_event" title="automaton.machines.FiniteMachine.process_event"><code class="xref py py-meth docutils literal"><span class="pre">process_event()</span></code></a> method
explicitly and trigger the events via
some <em>external</em> functionality/triggers…</p>
<dl class="class">
<dt id="automaton.machines.FiniteMachine.Effect">
<em class="property">class </em><code class="descname">Effect</code><span class="sig-paren">(</span><em>reaction</em>, <em>terminal</em><span class="sig-paren">)</span><a class="headerlink" href="#automaton.machines.FiniteMachine.Effect" title="Permalink to this definition">¶</a></dt>
<dd><p>The result of processing an event (cause and effect…)</p>
<dl class="attribute">
<dt id="automaton.machines.FiniteMachine.Effect.reaction">
<code class="descname">reaction</code><a class="headerlink" href="#automaton.machines.FiniteMachine.Effect.reaction" title="Permalink to this definition">¶</a></dt>
<dd><p>Alias for field number 0</p>
</dd></dl>
<dl class="attribute">
<dt id="automaton.machines.FiniteMachine.Effect.terminal">
<code class="descname">terminal</code><a class="headerlink" href="#automaton.machines.FiniteMachine.Effect.terminal" title="Permalink to this definition">¶</a></dt>
<dd><p>Alias for field number 1</p>
</dd></dl>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.FiniteMachine.__contains__">
<code class="descname">__contains__</code><span class="sig-paren">(</span><em>state</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine.__contains__"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine.__contains__" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns if this state exists in the machines known states.</p>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.FiniteMachine.__iter__">
<code class="descname">__iter__</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine.__iter__"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine.__iter__" title="Permalink to this definition">¶</a></dt>
<dd><p>Iterates over (start, event, end) transition tuples.</p>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.FiniteMachine.add_reaction">
<code class="descname">add_reaction</code><span class="sig-paren">(</span><em>state</em>, <em>event</em>, <em>reaction</em>, <em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine.add_reaction"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine.add_reaction" title="Permalink to this definition">¶</a></dt>
<dd><p>Adds a reaction that may get triggered by the given event & state.</p>
<p>Reaction callbacks may (depending on how the state machine is ran) be
used after an event is processed (and a transition occurs) to cause the
machine to react to the newly arrived at stable state.</p>
<p>These callbacks are expected to accept three default positional
parameters (although more can be passed in via <em>args and **kwargs,
these will automatically get provided to the callback when it is
activated *ontop</em> of the three default). The three default parameters
are the last stable state, the new stable state and the event that
caused the transition to this new stable state to be arrived at.</p>
<p>The expected result of a callback is expected to be a new event that
the callback wants the state machine to react to. This new event
may (depending on how the state machine is ran) get processed (and
this process typically repeats) until the state machine reaches a
terminal state.</p>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.FiniteMachine.add_state">
<code class="descname">add_state</code><span class="sig-paren">(</span><em>state</em>, <em>terminal=False</em>, <em>on_enter=None</em>, <em>on_exit=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine.add_state"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine.add_state" title="Permalink to this definition">¶</a></dt>
<dd><p>Adds a given state to the state machine.</p>
<p>The <code class="docutils literal"><span class="pre">on_enter</span></code> and <code class="docutils literal"><span class="pre">on_exit</span></code> callbacks, if provided will be
expected to take two positional parameters, these being the state
being exited (for <code class="docutils literal"><span class="pre">on_exit</span></code>) or the state being entered (for
<code class="docutils literal"><span class="pre">on_enter</span></code>) and a second parameter which is the event that is
being processed that caused the state transition.</p>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.FiniteMachine.add_transition">
<code class="descname">add_transition</code><span class="sig-paren">(</span><em>start</em>, <em>end</em>, <em>event</em>, <em>replace=False</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine.add_transition"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine.add_transition" title="Permalink to this definition">¶</a></dt>
<dd><p>Adds an allowed transition from start -> end for the given event.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>start</strong> – starting state</li>
<li><strong>end</strong> – ending state</li>
<li><strong>event</strong> – event that causes start state to
transition to end state</li>
<li><strong>replace</strong> – replace existing event instead of raising a
<a class="reference internal" href="#automaton.exceptions.Duplicate" title="automaton.exceptions.Duplicate"><code class="xref py py-class docutils literal"><span class="pre">Duplicate</span></code></a> exception
when the transition already exists.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="classmethod">
<dt id="automaton.machines.FiniteMachine.build">
<em class="property">classmethod </em><code class="descname">build</code><span class="sig-paren">(</span><em>state_space</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine.build"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine.build" title="Permalink to this definition">¶</a></dt>
<dd><p>Builds a machine from a state space listing.</p>
<p>Each element of this list must be an instance
of <a class="reference internal" href="#automaton.machines.State" title="automaton.machines.State"><code class="xref py py-class docutils literal"><span class="pre">State</span></code></a> or a <code class="docutils literal"><span class="pre">dict</span></code> with equivalent keys that
can be used to construct a <a class="reference internal" href="#automaton.machines.State" title="automaton.machines.State"><code class="xref py py-class docutils literal"><span class="pre">State</span></code></a> instance.</p>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.FiniteMachine.copy">
<code class="descname">copy</code><span class="sig-paren">(</span><em>shallow=False</em>, <em>unfreeze=False</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine.copy"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine.copy" title="Permalink to this definition">¶</a></dt>
<dd><p>Copies the current state machine.</p>
<p>NOTE(harlowja): the copy will be left in an <em>uninitialized</em> state.</p>
<dl class="docutils">
<dt>NOTE(harlowja): when a shallow copy is requested the copy will share</dt>
<dd>the same transition table and state table as the
source; this can be advantageous if you have a machine
and transitions + states that is defined somewhere
and want to use copies to run with (the copies have
the current state that is different between machines).</dd>
</dl>
</dd></dl>
<dl class="attribute">
<dt id="automaton.machines.FiniteMachine.current_state">
<code class="descname">current_state</code><a class="headerlink" href="#automaton.machines.FiniteMachine.current_state" title="Permalink to this definition">¶</a></dt>
<dd><p>The current state the machine is in (or none if not initialized).</p>
</dd></dl>
<dl class="attribute">
<dt id="automaton.machines.FiniteMachine.default_start_state">
<code class="descname">default_start_state</code><a class="headerlink" href="#automaton.machines.FiniteMachine.default_start_state" title="Permalink to this definition">¶</a></dt>
<dd><p>Sets the <em>default</em> start state that the machine should use.</p>
<p>NOTE(harlowja): this will be used by <code class="docutils literal"><span class="pre">initialize</span></code> but only if that
function is not given its own <code class="docutils literal"><span class="pre">start_state</span></code> that overrides this
default.</p>
</dd></dl>
<dl class="attribute">
<dt id="automaton.machines.FiniteMachine.events">
<code class="descname">events</code><a class="headerlink" href="#automaton.machines.FiniteMachine.events" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns how many events exist.</p>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.FiniteMachine.freeze">
<code class="descname">freeze</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine.freeze"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine.freeze" title="Permalink to this definition">¶</a></dt>
<dd><p>Freezes & stops addition of states, transitions, reactions…</p>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.FiniteMachine.initialize">
<code class="descname">initialize</code><span class="sig-paren">(</span><em>start_state=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine.initialize"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine.initialize" title="Permalink to this definition">¶</a></dt>
<dd><p>Sets up the state machine (sets current state to start state…).</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>start_state</strong> – explicit start state to use to initialize the
state machine to. If <code class="docutils literal"><span class="pre">None</span></code> is provided then
the machine’s default start state will be used
instead.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.FiniteMachine.is_actionable_event">
<code class="descname">is_actionable_event</code><span class="sig-paren">(</span><em>event</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine.is_actionable_event"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine.is_actionable_event" title="Permalink to this definition">¶</a></dt>
<dd><p>Check whether the event is actionable in the current state.</p>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.FiniteMachine.pformat">
<code class="descname">pformat</code><span class="sig-paren">(</span><em>sort=True</em>, <em>empty='.'</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine.pformat"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine.pformat" title="Permalink to this definition">¶</a></dt>
<dd><p>Pretty formats the state + transition table into a string.</p>
<p>NOTE(harlowja): the sort parameter can be provided to sort the states
and transitions by sort order; with it being provided as false the rows
will be iterated in addition order instead.</p>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.FiniteMachine.process_event">
<code class="descname">process_event</code><span class="sig-paren">(</span><em>event</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#FiniteMachine.process_event"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.FiniteMachine.process_event" title="Permalink to this definition">¶</a></dt>
<dd><p>Trigger a state change in response to the provided event.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Effect this is either a <a class="reference internal" href="#automaton.machines.FiniteMachine.Effect" title="automaton.machines.FiniteMachine.Effect"><code class="xref py py-class docutils literal"><span class="pre">FiniteMachine.Effect</span></code></a> or
an <code class="docutils literal"><span class="pre">Effect</span></code> from a subclass of <a class="reference internal" href="#automaton.machines.FiniteMachine" title="automaton.machines.FiniteMachine"><code class="xref py py-class docutils literal"><span class="pre">FiniteMachine</span></code></a>.
See the appropriate named tuple for a description of the
actual items in the tuple. For
example, <a class="reference internal" href="#automaton.machines.FiniteMachine.Effect" title="automaton.machines.FiniteMachine.Effect"><code class="xref py py-class docutils literal"><span class="pre">FiniteMachine.Effect</span></code></a>’s
first item is <code class="docutils literal"><span class="pre">reaction</span></code>: one could invoke this reaction’s
callback to react to the new stable state.</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">namedtuple</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="attribute">
<dt id="automaton.machines.FiniteMachine.states">
<code class="descname">states</code><a class="headerlink" href="#automaton.machines.FiniteMachine.states" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the state names.</p>
</dd></dl>
<dl class="attribute">
<dt id="automaton.machines.FiniteMachine.terminated">
<code class="descname">terminated</code><a class="headerlink" href="#automaton.machines.FiniteMachine.terminated" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns whether the state machine is in a terminal state.</p>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="automaton.machines.HierarchicalFiniteMachine">
<em class="property">class </em><code class="descclassname">automaton.machines.</code><code class="descname">HierarchicalFiniteMachine</code><a class="reference internal" href="../_modules/automaton/machines.html#HierarchicalFiniteMachine"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.HierarchicalFiniteMachine" title="Permalink to this definition">¶</a></dt>
<dd><p>A fsm that understands how to run in a hierarchical mode.</p>
<dl class="class">
<dt id="automaton.machines.HierarchicalFiniteMachine.Effect">
<em class="property">class </em><code class="descname">Effect</code><span class="sig-paren">(</span><em>reaction</em>, <em>terminal</em>, <em>machine</em><span class="sig-paren">)</span><a class="headerlink" href="#automaton.machines.HierarchicalFiniteMachine.Effect" title="Permalink to this definition">¶</a></dt>
<dd><p>The result of processing an event (cause and effect…)</p>
<dl class="attribute">
<dt id="automaton.machines.HierarchicalFiniteMachine.Effect.machine">
<code class="descname">machine</code><a class="headerlink" href="#automaton.machines.HierarchicalFiniteMachine.Effect.machine" title="Permalink to this definition">¶</a></dt>
<dd><p>Alias for field number 2</p>
</dd></dl>
<dl class="attribute">
<dt id="automaton.machines.HierarchicalFiniteMachine.Effect.reaction">
<code class="descname">reaction</code><a class="headerlink" href="#automaton.machines.HierarchicalFiniteMachine.Effect.reaction" title="Permalink to this definition">¶</a></dt>
<dd><p>Alias for field number 0</p>
</dd></dl>
<dl class="attribute">
<dt id="automaton.machines.HierarchicalFiniteMachine.Effect.terminal">
<code class="descname">terminal</code><a class="headerlink" href="#automaton.machines.HierarchicalFiniteMachine.Effect.terminal" title="Permalink to this definition">¶</a></dt>
<dd><p>Alias for field number 1</p>
</dd></dl>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.HierarchicalFiniteMachine.add_state">
<code class="descname">add_state</code><span class="sig-paren">(</span><em>state</em>, <em>terminal=False</em>, <em>on_enter=None</em>, <em>on_exit=None</em>, <em>machine=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#HierarchicalFiniteMachine.add_state"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.HierarchicalFiniteMachine.add_state" title="Permalink to this definition">¶</a></dt>
<dd><p>Adds a given state to the state machine.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>machine</strong> (<a class="reference internal" href="#automaton.machines.FiniteMachine" title="automaton.machines.FiniteMachine"><code class="xref py py-class docutils literal"><span class="pre">FiniteMachine</span></code></a>) – the nested state machine that will be transitioned
into when this state is entered</td>
</tr>
</tbody>
</table>
<p>Further arguments are interpreted as
for <a class="reference internal" href="#automaton.machines.FiniteMachine.add_state" title="automaton.machines.FiniteMachine.add_state"><code class="xref py py-meth docutils literal"><span class="pre">FiniteMachine.add_state()</span></code></a>.</p>
</dd></dl>
<dl class="method">
<dt id="automaton.machines.HierarchicalFiniteMachine.initialize">
<code class="descname">initialize</code><span class="sig-paren">(</span><em>start_state=None</em>, <em>nested_start_state_fetcher=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/machines.html#HierarchicalFiniteMachine.initialize"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.machines.HierarchicalFiniteMachine.initialize" title="Permalink to this definition">¶</a></dt>
<dd><p>Sets up the state machine (sets current state to start state…).</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>start_state</strong> – explicit start state to use to initialize the
state machine to. If <code class="docutils literal"><span class="pre">None</span></code> is provided then the
machine’s default start state will be used
instead.</li>
<li><strong>nested_start_state_fetcher</strong> – A callback that can return start
states for any nested machines
<strong>only</strong>. If not <code class="docutils literal"><span class="pre">None</span></code> then it
will be provided a single argument,
the machine to provide a starting
state for and it is expected to
return a starting state (or
<code class="docutils literal"><span class="pre">None</span></code>) for each machine called
with. Do note that this callback
will also be passed to other nested
state machines as well, so it will
also be used to initialize any state
machines they contain (recursively).</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="attribute">
<dt id="automaton.machines.HierarchicalFiniteMachine.nested_machines">
<code class="descname">nested_machines</code><a class="headerlink" href="#automaton.machines.HierarchicalFiniteMachine.nested_machines" title="Permalink to this definition">¶</a></dt>
<dd><p>Dictionary of <strong>all</strong> nested state machines this machine may use.</p>
</dd></dl>
</dd></dl>
</div>
<div class="section" id="runners">
<h2>Runners<a class="headerlink" href="#runners" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="automaton.runners.Runner">
<em class="property">class </em><code class="descclassname">automaton.runners.</code><code class="descname">Runner</code><span class="sig-paren">(</span><em>machine</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/runners.html#Runner"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.runners.Runner" title="Permalink to this definition">¶</a></dt>
<dd><p>Machine runner used to run a state machine.</p>
<p>Only <strong>one</strong> runner per machine should be active at the same time (aka
there should not be multiple runners using the same machine instance at
the same time).</p>
<dl class="method">
<dt id="automaton.runners.Runner.run">
<code class="descname">run</code><span class="sig-paren">(</span><em>event</em>, <em>initialize=True</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/runners.html#Runner.run"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.runners.Runner.run" title="Permalink to this definition">¶</a></dt>
<dd><p>Runs the state machine, using reactions only.</p>
</dd></dl>
<dl class="method">
<dt id="automaton.runners.Runner.run_iter">
<code class="descname">run_iter</code><span class="sig-paren">(</span><em>event</em>, <em>initialize=True</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/runners.html#Runner.run_iter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.runners.Runner.run_iter" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns a iterator/generator that will run the state machine.</p>
<p>NOTE(harlowja): only one runner iterator/generator should be active for
a machine, if this is not observed then it is possible for
initialization and other local state to be corrupted and cause issues
when running…</p>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="automaton.runners.FiniteRunner">
<em class="property">class </em><code class="descclassname">automaton.runners.</code><code class="descname">FiniteRunner</code><span class="sig-paren">(</span><em>machine</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/runners.html#FiniteRunner"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.runners.FiniteRunner" title="Permalink to this definition">¶</a></dt>
<dd><p>Finite machine runner used to run a finite machine.</p>
<p>Only <strong>one</strong> runner per machine should be active at the same time (aka
there should not be multiple runners using the same machine instance at
the same time).</p>
</dd></dl>
<dl class="class">
<dt id="automaton.runners.HierarchicalRunner">
<em class="property">class </em><code class="descclassname">automaton.runners.</code><code class="descname">HierarchicalRunner</code><span class="sig-paren">(</span><em>machine</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/runners.html#HierarchicalRunner"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.runners.HierarchicalRunner" title="Permalink to this definition">¶</a></dt>
<dd><p>Hierarchical machine runner used to run a hierarchical machine.</p>
<p>Only <strong>one</strong> runner per machine should be active at the same time (aka
there should not be multiple runners using the same machine instance at
the same time).</p>
<dl class="method">
<dt id="automaton.runners.HierarchicalRunner.run_iter">
<code class="descname">run_iter</code><span class="sig-paren">(</span><em>event</em>, <em>initialize=True</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/runners.html#HierarchicalRunner.run_iter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.runners.HierarchicalRunner.run_iter" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns a iterator/generator that will run the state machine.</p>
<p>This will keep a stack (hierarchy) of machines active and jumps through
them as needed (depending on which machine handles which event) during
the running lifecycle.</p>
<p>NOTE(harlowja): only one runner iterator/generator should be active for
a machine hierarchy, if this is not observed then it is possible for
initialization and other local state to be corrupted and causes issues
when running…</p>
</dd></dl>
</dd></dl>
</div>
<div class="section" id="module-automaton.converters.pydot">
<span id="converters"></span><h2>Converters<a class="headerlink" href="#module-automaton.converters.pydot" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="automaton.converters.pydot.convert">
<code class="descclassname">automaton.converters.pydot.</code><code class="descname">convert</code><span class="sig-paren">(</span><em>machine</em>, <em>graph_name</em>, <em>graph_attrs=None</em>, <em>node_attrs_cb=None</em>, <em>edge_attrs_cb=None</em>, <em>add_start_state=True</em>, <em>name_translations=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/automaton/converters/pydot.html#convert"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.converters.pydot.convert" title="Permalink to this definition">¶</a></dt>
<dd><p>Translates the state machine into a pydot graph.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>machine</strong> (<a class="reference internal" href="#automaton.machines.FiniteMachine" title="automaton.machines.FiniteMachine"><em>FiniteMachine</em></a>) – state machine to convert</li>
<li><strong>graph_name</strong> (<em>string</em>) – name of the graph to be created</li>
<li><strong>graph_attrs</strong> (<em>dict</em>) – any initial graph attributes to set
(see <a class="reference external" href="http://www.graphviz.org/doc/info/attrs.html">http://www.graphviz.org/doc/info/attrs.html</a> for
what these can be)</li>
<li><strong>node_attrs_cb</strong> (<em>callback</em>) – a callback that takes one argument <code class="docutils literal"><span class="pre">state</span></code>
and is expected to return a dict of node attributes
(see <a class="reference external" href="http://www.graphviz.org/doc/info/attrs.html">http://www.graphviz.org/doc/info/attrs.html</a> for
what these can be)</li>
<li><strong>edge_attrs_cb</strong> (<em>callback</em>) – a callback that takes three arguments <code class="docutils literal"><span class="pre">start_state,</span>
<span class="pre">event,</span> <span class="pre">end_state</span></code> and is expected to return a dict
of edge attributes (see
<a class="reference external" href="http://www.graphviz.org/doc/info/attrs.html">http://www.graphviz.org/doc/info/attrs.html</a> for
what these can be)</li>
<li><strong>add_start_state</strong> (<em>bool</em>) – when enabled this creates a <em>private</em> start state
with the name <code class="docutils literal"><span class="pre">__start__</span></code> that will be a point
node that will have a dotted edge to the
<code class="docutils literal"><span class="pre">default_start_state</span></code> that your machine may have
defined (if your machine has no actively defined
<code class="docutils literal"><span class="pre">default_start_state</span></code> then this does nothing,
even if enabled)</li>
<li><strong>name_translations</strong> (<em>dict</em>) – a dict that provides alternative <code class="docutils literal"><span class="pre">state</span></code>
string names for each state</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
</div>
<div class="section" id="module-automaton.exceptions">
<span id="exceptions"></span><h2>Exceptions<a class="headerlink" href="#module-automaton.exceptions" title="Permalink to this headline">¶</a></h2>
<dl class="exception">
<dt id="automaton.exceptions.AutomatonException">
<em class="property">exception </em><code class="descclassname">automaton.exceptions.</code><code class="descname">AutomatonException</code><a class="reference internal" href="../_modules/automaton/exceptions.html#AutomatonException"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.exceptions.AutomatonException" title="Permalink to this definition">¶</a></dt>
<dd><p>Base class for <em>most</em> exceptions emitted from this library.</p>
</dd></dl>
<dl class="exception">
<dt id="automaton.exceptions.Duplicate">
<em class="property">exception </em><code class="descclassname">automaton.exceptions.</code><code class="descname">Duplicate</code><a class="reference internal" href="../_modules/automaton/exceptions.html#Duplicate"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.exceptions.Duplicate" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised when a duplicate entry is found.</p>
</dd></dl>
<dl class="exception">
<dt id="automaton.exceptions.FrozenMachine">
<em class="property">exception </em><code class="descclassname">automaton.exceptions.</code><code class="descname">FrozenMachine</code><a class="reference internal" href="../_modules/automaton/exceptions.html#FrozenMachine"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.exceptions.FrozenMachine" title="Permalink to this definition">¶</a></dt>
<dd><p>Exception raised when a frozen machine is modified.</p>
</dd></dl>
<dl class="exception">
<dt id="automaton.exceptions.InvalidState">
<em class="property">exception </em><code class="descclassname">automaton.exceptions.</code><code class="descname">InvalidState</code><a class="reference internal" href="../_modules/automaton/exceptions.html#InvalidState"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.exceptions.InvalidState" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised when a invalid state transition is attempted while executing.</p>
</dd></dl>
<dl class="exception">
<dt id="automaton.exceptions.NotFound">
<em class="property">exception </em><code class="descclassname">automaton.exceptions.</code><code class="descname">NotFound</code><a class="reference internal" href="../_modules/automaton/exceptions.html#NotFound"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.exceptions.NotFound" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised when some entry in some object doesn’t exist.</p>
</dd></dl>
<dl class="exception">
<dt id="automaton.exceptions.NotInitialized">
<em class="property">exception </em><code class="descclassname">automaton.exceptions.</code><code class="descname">NotInitialized</code><a class="reference internal" href="../_modules/automaton/exceptions.html#NotInitialized"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#automaton.exceptions.NotInitialized" title="Permalink to this definition">¶</a></dt>
<dd><p>Error raised when an action is attempted on a not inited machine.</p>
</dd></dl>
<div class="section" id="hierarchy">
<h3>Hierarchy<a class="headerlink" href="#hierarchy" title="Permalink to this headline">¶</a></h3>
digraph inheritance348b908e00 {
rankdir=LR;
size="8.0, 12.0";
"AutomatonException" [URL="#automaton.exceptions.AutomatonException",fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,shape=box,style="setlinewidth(0.5)",target="_top",tooltip="Base class for *most* exceptions emitted from this library."];
"Duplicate" [URL="#automaton.exceptions.Duplicate",fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,shape=box,style="setlinewidth(0.5)",target="_top",tooltip="Raised when a duplicate entry is found."];
"AutomatonException" -> "Duplicate" [arrowsize=0.5,style="setlinewidth(0.5)"];
"FrozenMachine" [URL="#automaton.exceptions.FrozenMachine",fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,shape=box,style="setlinewidth(0.5)",target="_top",tooltip="Exception raised when a frozen machine is modified."];
"AutomatonException" -> "FrozenMachine" [arrowsize=0.5,style="setlinewidth(0.5)"];
"InvalidState" [URL="#automaton.exceptions.InvalidState",fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,shape=box,style="setlinewidth(0.5)",target="_top",tooltip="Raised when a invalid state transition is attempted while executing."];
"AutomatonException" -> "InvalidState" [arrowsize=0.5,style="setlinewidth(0.5)"];
"NotFound" [URL="#automaton.exceptions.NotFound",fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,shape=box,style="setlinewidth(0.5)",target="_top",tooltip="Raised when some entry in some object doesn't exist."];
"AutomatonException" -> "NotFound" [arrowsize=0.5,style="setlinewidth(0.5)"];
"NotInitialized" [URL="#automaton.exceptions.NotInitialized",fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,shape=box,style="setlinewidth(0.5)",target="_top",tooltip="Error raised when an action is attempted on a not inited machine."];
"AutomatonException" -> "NotInitialized" [arrowsize=0.5,style="setlinewidth(0.5)"];
}
</div>
</div>
</div>
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<div class="docs-updated">updated: 2018-01-23 17:06</div>
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<div class="docs-sidebar-section" id="table-of-contents">
<a href="../index.html" class="docs-sidebar-section-title"><h4>automaton </h4></a>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../user/index.html">automaton User Guide</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">API</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#machines">Machines</a></li>
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