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Class Transition
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<!-- ==================== TYPE DESCRIPTION ==================== -->
<h1 class="epydoc">type Transition</h1><p class="nomargin-top"><span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition">source code</a></span></p>
<pre class="base-tree">
object --+
|
<strong class="uidshort">Transition</strong>
</pre>
<hr />
<p>Representation of a FAC state transition.</p>
<!-- ==================== INSTANCE METHODS ==================== -->
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<td><span class="summary-sig"><a name="__get_destination"></a><span class="summary-sig-name">__get_destination</span>(<span class="summary-sig-arg">self</span>)</span><br />
The transition destination state.</td>
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<td><span class="summary-sig"><a name="__get_updateInstructions"></a><span class="summary-sig-name">__get_updateInstructions</span>(<span class="summary-sig-arg">self</span>)</span><br />
The set of counter updates that are applied when the transition is
taken.</td>
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<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__get_updateInstructions">source code</a></span>
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<td><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#__get_nextTransition" class="summary-sig-name" onclick="show_private();">__get_nextTransition</a>(<span class="summary-sig-arg">self</span>)</span><br />
The next transition to apply in this chain.</td>
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<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__get_nextTransition">source code</a></span>
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<td><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#__get_layerLink" class="summary-sig-name" onclick="show_private();">__get_layerLink</a>(<span class="summary-sig-arg">self</span>)</span><br />
A directive relating to changing automaton layer on transition.</td>
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<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__get_layerLink">source code</a></span>
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<td><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">destination</span>,
<span class="summary-sig-arg">update_instructions</span>,
<span class="summary-sig-arg">layer_link</span>=<span class="summary-sig-default">None</span>)</span><br />
Create a transition to a state.</td>
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<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__init__">source code</a></span>
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<td><span class="summary-sig"><a name="consumingState"></a><span class="summary-sig-name">consumingState</span>(<span class="summary-sig-arg">self</span>)</span><br />
Return the state in this transition chain that must match a symbol.</td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.consumingState">source code</a></span>
</td>
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<td><span class="summary-sig"><a name="consumedSymbol"></a><span class="summary-sig-name">consumedSymbol</span>(<span class="summary-sig-arg">self</span>)</span><br />
Return the <a href="pyxb.utils.fac.State-class.html#symbol"
class="link">symbol</a> of the <a
href="pyxb.utils.fac.Transition-class.html#consumingState"
class="link">consumingState</a>.</td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.consumedSymbol">source code</a></span>
</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#satisfiedBy" class="summary-sig-name">satisfiedBy</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">configuration</span>)</span><br />
Check the transition update instructions against configuration
counter values.</td>
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<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.satisfiedBy">source code</a></span>
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<td><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#apply" class="summary-sig-name">apply</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">configuration</span>,
<span class="summary-sig-arg">clone_map</span>=<span class="summary-sig-default">None</span>)</span><br />
Apply the transitition to a configuration.</td>
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<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.apply">source code</a></span>
</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#chainTo" class="summary-sig-name">chainTo</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">next_transition</span>)</span><br />
Duplicate the state and chain the duplicate to a successor
transition.</td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.chainTo">source code</a></span>
</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#makeEnterAutomatonTransition" class="summary-sig-name">makeEnterAutomatonTransition</a>(<span class="summary-sig-arg">self</span>)</span><br />
Replicate the transition as a layer link into its automaton.</td>
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<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.makeEnterAutomatonTransition">source code</a></span>
</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#__hash__" class="summary-sig-name">__hash__</a>(<span class="summary-sig-arg">self</span>)</span></td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__hash__">source code</a></span>
</td>
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<span class="summary-type"> </span>
</td><td class="summary">
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<td><span class="summary-sig"><a name="__eq__"></a><span class="summary-sig-name">__eq__</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">other</span>)</span></td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__eq__">source code</a></span>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a name="__ne__"></a><span class="summary-sig-name">__ne__</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">other</span>)</span></td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__ne__">source code</a></span>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#__str__" class="summary-sig-name">__str__</a>(<span class="summary-sig-arg">self</span>)</span></td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__str__">source code</a></span>
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<!-- ==================== CLASS VARIABLES ==================== -->
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<a name="__destination"></a><span class="summary-name">__destination</span> = <code title="None">None</code>
</td>
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<span class="summary-type"> </span>
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<a name="__updateInstructions"></a><span class="summary-name">__updateInstructions</span> = <code title="None">None</code>
</td>
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<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a name="__nextTransition"></a><span class="summary-name">__nextTransition</span> = <code title="None">None</code>
</td>
</tr>
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<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a name="__layerLink"></a><span class="summary-name">__layerLink</span> = <code title="None">None</code>
</td>
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<!-- ==================== PROPERTIES ==================== -->
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<td align="left"><span class="table-header">Properties</span></td>
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<span class="summary-type"> </span>
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<a href="pyxb.utils.fac.Transition-class.html#destination" class="summary-name">destination</a><br />
The transition destination state.
</td>
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<span class="summary-type"> </span>
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<a href="pyxb.utils.fac.Transition-class.html#updateInstructions" class="summary-name">updateInstructions</a><br />
The set of counter updates that are applied when the transition is
taken.
</td>
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<span class="summary-type"> </span>
</td><td class="summary">
<a href="pyxb.utils.fac.Transition-class.html#nextTransition" class="summary-name">nextTransition</a><br />
The next transition to apply in this chain.
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<span class="summary-type"> </span>
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<a href="pyxb.utils.fac.Transition-class.html#layerLink" class="summary-name">layerLink</a><br />
A directive relating to changing automaton layer on transition.
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<!-- ==================== METHOD DETAILS ==================== -->
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<a name="__get_nextTransition"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__get_nextTransition</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__get_nextTransition">source code</a></span>
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<p>The next transition to apply in this chain.</p>
<p><code>None</code> if this is the last transition in the chain.</p>
<dl class="fields">
</dl>
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<a name="__get_layerLink"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__get_layerLink</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__get_layerLink">source code</a></span>
</td>
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<p>A directive relating to changing automaton layer on transition.</p>
<p><code>None</code> indicates this transition is from one state to
another within a single automaton.</p>
<p>An instance of <a href="pyxb.utils.fac.Configuration-class.html"
class="link">Configuration</a> is a transition on completion of a
subautomaton back to the configuration in the parent automaton. The <a
href="pyxb.utils.fac.Transition-class.html#destination"
class="link">destination</a> is the state in the parent automaton.</p>
<p>An instance of <a href="pyxb.utils.fac.Automaton-class.html"
class="link">Automaton</a> requires creation of a sub-configuration and
initial entry into the automaton. The <a
href="pyxb.utils.fac.Transition-class.html#destination"
class="link">destination</a> is the state in the sub-automaton.</p>
<dl class="fields">
</dl>
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<a name="__init__"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">destination</span>,
<span class="sig-arg">update_instructions</span>,
<span class="sig-arg">layer_link</span>=<span class="sig-default">None</span>)</span>
<br /><em class="fname">(Constructor)</em>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__init__">source code</a></span>
</td>
</tr></table>
<p>Create a transition to a state.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>destination</code></strong> - the state into which the transition is made</li>
<li><strong class="pname"><code>update_instructions</code></strong> - A iterable of <a
href="pyxb.utils.fac.UpdateInstruction-class.html"
class="link">UpdateInstruction</a>s denoting the changes that
must be made to counters as a consequence of taking the
transition.</li>
<li><strong class="pname"><code>layer_link</code></strong> - The value for <a
href="pyxb.utils.fac.Transition-class.html#layerLink"
class="link">layerLink</a>.</li>
</ul></dd>
<dt>Overrides:
object.__init__
</dt>
</dl>
</td></tr></table>
</div>
<a name="satisfiedBy"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">satisfiedBy</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">configuration</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.satisfiedBy">source code</a></span>
</td>
</tr></table>
<p>Check the transition update instructions against configuration counter
values.</p>
<p>This implementation follows layer changes, updating the configuration
used as counter value source as necessary.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>configuration</code></strong> - A <a href="pyxb.utils.fac.Configuration-class.html"
class="link">Configuration</a> instance containing counter data
against which update instruction satisfaction is checked.</li>
</ul></dd>
<dt>Returns:</dt>
<dd><code>True</code> iff all update instructions along the
transition chain are satisfied by their relevant configuration.</dd>
</dl>
</td></tr></table>
</div>
<a name="apply"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">apply</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">configuration</span>,
<span class="sig-arg">clone_map</span>=<span class="sig-default">None</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.apply">source code</a></span>
</td>
</tr></table>
<p>Apply the transitition to a configuration.</p>
<p>This updates the configuration counter values based on the update
instructions, and sets the new configuration state.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>configuration</code></strong> - A <a href="pyxb.utils.fac.Configuration-class.html"
class="link">Configuration</a> of an executing automaton</li>
<li><strong class="pname"><code>clone_map</code></strong> - A map from <a href="pyxb.utils.fac.Configuration-class.html"
class="link">Configuration</a> to <a
href="pyxb.utils.fac.Configuration-class.html"
class="link">Configuration</a> reflecting the replacements made
when the configuration for which the transition was calculated
was subsequently cloned into the <code>configuration</code>
passed into this method. This is only necessary when the
transition includes layer transitions.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>The resulting configuration</dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
If the transition involves leaving a sub-automaton or creating a
new sub-automaton, the returned configuration structure will be
different from the one passed in. You should invoke this as:
<pre class="literalblock">
cfg = transition.apply(cfg)
</pre>
</p>
</div></td></tr></table>
</div>
<a name="chainTo"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">chainTo</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">next_transition</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.chainTo">source code</a></span>
</td>
</tr></table>
<p>Duplicate the state and chain the duplicate to a successor
transition.</p>
<p>This returns a new transition which applies the operation for this
transition, then proceeds to apply the next transition in the chain.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>next_transition</code></strong> - A <a href="pyxb.utils.fac.Transition-class.html"
class="link">Transition</a> node describing a subsequent
transition.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>a clone of this node, augmented with a link to
<code>next_transition</code>.</dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
The node that is invoking this must not have successor transitions.
</p>
</div></td></tr></table>
</div>
<a name="makeEnterAutomatonTransition"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">makeEnterAutomatonTransition</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.makeEnterAutomatonTransition">source code</a></span>
</td>
</tr></table>
<p>Replicate the transition as a layer link into its automaton.</p>
<p>This is used on initial transitions into sub-automata where a
sub-configuration must be created and recorded.</p>
<dl class="fields">
</dl>
</td></tr></table>
</div>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__hash__</span>(<span class="sig-arg">self</span>)</span>
<br /><em class="fname">(Hashing function)</em>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__hash__">source code</a></span>
</td>
</tr></table>
<dl class="fields">
<dt>Overrides:
object.__hash__
<dd><em class="note">(inherited documentation)</em></dd>
</dt>
</dl>
</td></tr></table>
</div>
<a name="__str__"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__str__</span>(<span class="sig-arg">self</span>)</span>
<br /><em class="fname">(Informal representation operator)</em>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.fac-pysrc.html#Transition.__str__">source code</a></span>
</td>
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<dl class="fields">
<dt>Overrides:
object.__str__
<dd><em class="note">(inherited documentation)</em></dd>
</dt>
</dl>
</td></tr></table>
</div>
<br />
<!-- ==================== PROPERTY DETAILS ==================== -->
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<a name="destination"></a>
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<h3 class="epydoc">destination</h3>
<p>The transition destination state.</p>
<dl class="fields">
<dt>Get Method:</dt>
<dd class="value"><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#__get_destination" class="summary-sig-name" onclick="show_private();">__get_destination</a>(<span class="summary-sig-arg">self</span>)</span>
- The transition destination state.
</dd>
</dl>
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<a name="updateInstructions"></a>
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<tr><td>
<h3 class="epydoc">updateInstructions</h3>
<p>The set of counter updates that are applied when the transition is
taken.</p>
<dl class="fields">
<dt>Get Method:</dt>
<dd class="value"><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#__get_updateInstructions" class="summary-sig-name" onclick="show_private();">__get_updateInstructions</a>(<span class="summary-sig-arg">self</span>)</span>
- The set of counter updates that are applied when the transition is
taken.
</dd>
</dl>
</td></tr></table>
</div>
<a name="nextTransition"></a>
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<h3 class="epydoc">nextTransition</h3>
<p>The next transition to apply in this chain.</p>
<p><code>None</code> if this is the last transition in the chain.</p>
<dl class="fields">
<dt>Get Method:</dt>
<dd class="value"><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#__get_nextTransition" class="summary-sig-name" onclick="show_private();">__get_nextTransition</a>(<span class="summary-sig-arg">self</span>)</span>
- The next transition to apply in this chain.
</dd>
</dl>
</td></tr></table>
</div>
<a name="layerLink"></a>
<div>
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cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<h3 class="epydoc">layerLink</h3>
<p>A directive relating to changing automaton layer on transition.</p>
<p><code>None</code> indicates this transition is from one state to
another within a single automaton.</p>
<p>An instance of <a href="pyxb.utils.fac.Configuration-class.html"
class="link">Configuration</a> is a transition on completion of a
subautomaton back to the configuration in the parent automaton. The <a
href="pyxb.utils.fac.Transition-class.html#destination"
class="link">destination</a> is the state in the parent automaton.</p>
<p>An instance of <a href="pyxb.utils.fac.Automaton-class.html"
class="link">Automaton</a> requires creation of a sub-configuration and
initial entry into the automaton. The <a
href="pyxb.utils.fac.Transition-class.html#destination"
class="link">destination</a> is the state in the sub-automaton.</p>
<dl class="fields">
<dt>Get Method:</dt>
<dd class="value"><span class="summary-sig"><a href="pyxb.utils.fac.Transition-class.html#__get_layerLink" class="summary-sig-name" onclick="show_private();">__get_layerLink</a>(<span class="summary-sig-arg">self</span>)</span>
- A directive relating to changing automaton layer on transition.
</dd>
</dl>
</td></tr></table>
</div>
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