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| <a href="TestON-module.html">Package TestON</a> :: |
| <a href="TestON.core-module.html">Package core</a> :: |
| <a href="TestON.core.ast-module.html">Module ast</a> :: |
| Class NodeTransformer |
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| <!-- ==================== CLASS DESCRIPTION ==================== --> |
| <h1 class="epydoc">Class NodeTransformer</h1><p class="nomargin-top"><span class="codelink"><a href="TestON.core.ast-pysrc.html#NodeTransformer">source code</a></span></p> |
| <pre class="base-tree"> |
| object --+ |
| | |
| <a href="TestON.core.ast.NodeVisitor-class.html">NodeVisitor</a> --+ |
| | |
| <strong class="uidshort">NodeTransformer</strong> |
| </pre> |
| |
| <hr /> |
| <p>A :class:`NodeVisitor` subclass that walks the abstract syntax tree |
| and allows modification of nodes.</p> |
| <p>The `NodeTransformer` will walk the AST and use the return value of |
| the visitor methods to replace or remove the old node. If the return |
| value of the visitor method is ``None``, the node will be removed from |
| its location, otherwise it is replaced with the return value. The return |
| value may be the original node in which case no replacement takes |
| place.</p> |
| <p>Here is an example transformer that rewrites all occurrences of name |
| lookups (``foo``) to ``data['foo']``:</p> |
| <pre class="literalblock"> |
| class RewriteName(NodeTransformer): |
| |
| def visit_Name(self, node): |
| return copy_location(Subscript( |
| value=Name(id='data', ctx=Load()), |
| slice=Index(value=Str(s=node.id)), |
| ctx=node.ctx |
| ), node) |
| </pre> |
| <p>Keep in mind that if the node you're operating on has child nodes you |
| must either transform the child nodes yourself or call the |
| :meth:`generic_visit` method for the node first.</p> |
| <p>For nodes that were part of a collection of statements (that applies |
| to all statement nodes), the visitor may also return a list of nodes |
| rather than just a single node.</p> |
| <p>Usually you use the transformer like this:</p> |
| <pre class="literalblock"> |
| node = YourTransformer().visit(node) |
| </pre> |
| |
| <!-- ==================== INSTANCE METHODS ==================== --> |
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| <span class="summary-type"> </span> |
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| <td><span class="summary-sig"><a href="TestON.core.ast.NodeTransformer-class.html#generic_visit" class="summary-sig-name">generic_visit</a>(<span class="summary-sig-arg">self</span>, |
| <span class="summary-sig-arg">node</span>)</span><br /> |
| Called if no explicit visitor function exists for a node.</td> |
| <td align="right" valign="top"> |
| <span class="codelink"><a href="TestON.core.ast-pysrc.html#NodeTransformer.generic_visit">source code</a></span> |
| |
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| <td colspan="2" class="summary"> |
| <p class="indent-wrapped-lines"><b>Inherited from <code><a href="TestON.core.ast.NodeVisitor-class.html">NodeVisitor</a></code></b>: |
| <code><a href="TestON.core.ast.NodeVisitor-class.html#visit">visit</a></code> |
| </p> |
| <p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>: |
| <code>__delattr__</code>, |
| <code>__format__</code>, |
| <code>__getattribute__</code>, |
| <code>__hash__</code>, |
| <code>__init__</code>, |
| <code>__new__</code>, |
| <code>__reduce__</code>, |
| <code>__reduce_ex__</code>, |
| <code>__repr__</code>, |
| <code>__setattr__</code>, |
| <code>__sizeof__</code>, |
| <code>__str__</code>, |
| <code>__subclasshook__</code> |
| </p> |
| </td> |
| </tr> |
| </table> |
| <!-- ==================== PROPERTIES ==================== --> |
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| <p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>: |
| <code>__class__</code> |
| </p> |
| </td> |
| </tr> |
| </table> |
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| <a name="generic_visit"></a> |
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| <h3 class="epydoc"><span class="sig"><span class="sig-name">generic_visit</span>(<span class="sig-arg">self</span>, |
| <span class="sig-arg">node</span>)</span> |
| </h3> |
| </td><td align="right" valign="top" |
| ><span class="codelink"><a href="TestON.core.ast-pysrc.html#NodeTransformer.generic_visit">source code</a></span> |
| </td> |
| </tr></table> |
| |
| <p>Called if no explicit visitor function exists for a node.</p> |
| <dl class="fields"> |
| <dt>Overrides: |
| <a href="TestON.core.ast.NodeVisitor-class.html#generic_visit">NodeVisitor.generic_visit</a> |
| <dd><em class="note">(inherited documentation)</em></dd> |
| </dt> |
| </dl> |
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