src/eric7/Documentation/Source/eric7.UI.PythonAstViewer.html

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<h1>eric7.UI.PythonAstViewer</h1>

<p>
Module implementing a widget to visualize the Python AST for some Python
sources.
</p>
<h3>Global Attributes</h3>

<table>
<tr><td>None</td></tr>
</table>
<h3>Classes</h3>

<table>

<tr>
<td><a href="#PythonAstViewer">PythonAstViewer</a></td>
<td>Class implementing a widget to visualize the Python AST for some Python sources.</td>
</tr>
</table>
<h3>Functions</h3>

<table>
<tr><td>None</td></tr>
</table>
<hr />
<hr />
<a NAME="PythonAstViewer" ID="PythonAstViewer"></a>
<h2>PythonAstViewer</h2>

<p>
    Class implementing a widget to visualize the Python AST for some Python
    sources.
</p>
<h3>Derived from</h3>
QWidget
<h3>Class Attributes</h3>

<table>
<tr><td>EndIndexRole</td></tr><tr><td>EndLineRole</td></tr><tr><td>StartIndexRole</td></tr><tr><td>StartLineRole</td></tr>
</table>
<h3>Class Methods</h3>

<table>
<tr><td>None</td></tr>
</table>
<h3>Methods</h3>

<table>

<tr>
<td><a href="#PythonAstViewer.__init__">PythonAstViewer</a></td>
<td>Constructor</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__astItemClicked">__astItemClicked</a></td>
<td>Private slot handling a user click on an AST node item.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__astViewerStateChanged">__astViewerStateChanged</a></td>
<td>Private slot to toggle the display of the AST viewer.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__clearSelection">__clearSelection</a></td>
<td>Private method to clear all selected items.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__createErrorItem">__createErrorItem</a></td>
<td>Private method to create a top level error item.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__editorChanged">__editorChanged</a></td>
<td>Private slot to handle a change of the current editor.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__editorDoubleClicked">__editorDoubleClicked</a></td>
<td></td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__editorLanguageChanged">__editorLanguageChanged</a></td>
<td>Private slot to handle a change of the editor language.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__editorSaved">__editorSaved</a></td>
<td>Private slot to reload the AST after the connected editor was saved.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__findClosestContainingItem">__findClosestContainingItem</a></td>
<td>Private method to search for the tree item that contains a range closest.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__findClosestContainingNode">__findClosestContainingNode</a></td>
<td>Private method to search for the AST node that contains a range closest.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__grabFocus">__grabFocus</a></td>
<td>Private method to grab the input focus.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__lastEditorClosed">__lastEditorClosed</a></td>
<td>Private slot to handle the last editor closed signal of the view manager.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__loadAST">__loadAST</a></td>
<td>Private method to generate the AST from the source of the current editor and visualize it.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__markTextRanges">__markTextRanges</a></td>
<td>Private method to modify the AST nodes with end_lineno and end_col_offset information.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__populateNode">__populateNode</a></td>
<td>Private method to populate the tree view with a node.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__rangeContainsSmaller">__rangeContainsSmaller</a></td>
<td>Private method to check, if second is contained in first.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__rangeContainsSmallerOrEqual">__rangeContainsSmallerOrEqual</a></td>
<td>Private method to check, if second is contained in or equal to first.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__resizeColumns">__resizeColumns</a></td>
<td>Private method to resize the columns to suitable values.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.__selectItemForEditorSelection">__selectItemForEditorSelection</a></td>
<td>Private slot to select the item corresponding to an editor selection.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.hide">hide</a></td>
<td>Public slot to hide the AST viewer.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.preferencesChanged">preferencesChanged</a></td>
<td>Public slot handling changes of the AST viewer settings.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.resizeEvent">resizeEvent</a></td>
<td>Protected method to handle resize events.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.show">show</a></td>
<td>Public slot to show the AST viewer.</td>
</tr>
<tr>
<td><a href="#PythonAstViewer.shutdown">shutdown</a></td>
<td>Public method to perform shutdown actions.</td>
</tr>
</table>
<h3>Static Methods</h3>

<table>
<tr><td>None</td></tr>
</table>

<a NAME="PythonAstViewer.__init__" ID="PythonAstViewer.__init__"></a>
<h4>PythonAstViewer (Constructor)</h4>
<b>PythonAstViewer</b>(<i>viewmanager, parent=None</i>)

<p>
        Constructor
</p>
<dl>

<dt><i>viewmanager</i> (ViewManager)</dt>
<dd>
reference to the viewmanager object
</dd>
<dt><i>parent</i> (QWidget)</dt>
<dd>
reference to the parent widget
</dd>
</dl>
<a NAME="PythonAstViewer.__astItemClicked" ID="PythonAstViewer.__astItemClicked"></a>
<h4>PythonAstViewer.__astItemClicked</h4>
<b>__astItemClicked</b>(<i>itm, column</i>)

<p>
        Private slot handling a user click on an AST node item.
</p>
<dl>

<dt><i>itm</i> (QTreeWidgetItem)</dt>
<dd>
reference to the clicked item
</dd>
<dt><i>column</i> (int)</dt>
<dd>
column number of the click
</dd>
</dl>
<a NAME="PythonAstViewer.__astViewerStateChanged" ID="PythonAstViewer.__astViewerStateChanged"></a>
<h4>PythonAstViewer.__astViewerStateChanged</h4>
<b>__astViewerStateChanged</b>(<i>on</i>)

<p>
        Private slot to toggle the display of the AST viewer.
</p>
<dl>

<dt><i>on</i> (bool)</dt>
<dd>
flag indicating to show the AST
</dd>
</dl>
<a NAME="PythonAstViewer.__clearSelection" ID="PythonAstViewer.__clearSelection"></a>
<h4>PythonAstViewer.__clearSelection</h4>
<b>__clearSelection</b>(<i></i>)

<p>
        Private method to clear all selected items.
</p>
<a NAME="PythonAstViewer.__createErrorItem" ID="PythonAstViewer.__createErrorItem"></a>
<h4>PythonAstViewer.__createErrorItem</h4>
<b>__createErrorItem</b>(<i>error</i>)

<p>
        Private method to create a top level error item.
</p>
<dl>

<dt><i>error</i> (str)</dt>
<dd>
error message
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
generated item
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
QTreeWidgetItem
</dd>
</dl>
<a NAME="PythonAstViewer.__editorChanged" ID="PythonAstViewer.__editorChanged"></a>
<h4>PythonAstViewer.__editorChanged</h4>
<b>__editorChanged</b>(<i>editor</i>)

<p>
        Private slot to handle a change of the current editor.
</p>
<dl>

<dt><i>editor</i> (Editor)</dt>
<dd>
reference to the current editor
</dd>
</dl>
<a NAME="PythonAstViewer.__editorDoubleClicked" ID="PythonAstViewer.__editorDoubleClicked"></a>
<h4>PythonAstViewer.__editorDoubleClicked</h4>
<b>__editorDoubleClicked</b>(<i>editor, pos, buttons</i>)

<a NAME="PythonAstViewer.__editorLanguageChanged" ID="PythonAstViewer.__editorLanguageChanged"></a>
<h4>PythonAstViewer.__editorLanguageChanged</h4>
<b>__editorLanguageChanged</b>(<i>editor</i>)

<p>
        Private slot to handle a change of the editor language.
</p>
<dl>

<dt><i>editor</i> (Editor)</dt>
<dd>
reference to the editor which changed language
</dd>
</dl>
<a NAME="PythonAstViewer.__editorSaved" ID="PythonAstViewer.__editorSaved"></a>
<h4>PythonAstViewer.__editorSaved</h4>
<b>__editorSaved</b>(<i>editor</i>)

<p>
        Private slot to reload the AST after the connected editor was saved.
</p>
<dl>

<dt><i>editor</i> (Editor)</dt>
<dd>
reference to the editor that performed a save action
</dd>
</dl>
<a NAME="PythonAstViewer.__findClosestContainingItem" ID="PythonAstViewer.__findClosestContainingItem"></a>
<h4>PythonAstViewer.__findClosestContainingItem</h4>
<b>__findClosestContainingItem</b>(<i>itm, textRange</i>)

<p>
        Private method to search for the tree item that contains a range
        closest.
</p>
<dl>

<dt><i>itm</i> (QTreeWidgetItem)</dt>
<dd>
tree item to start searching at
</dd>
<dt><i>textRange</i> (tuple of (int, int, int, int))</dt>
<dd>
tuple giving the start and end positions
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
best matching tree item
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
QTreeWidgetItem
</dd>
</dl>
<a NAME="PythonAstViewer.__findClosestContainingNode" ID="PythonAstViewer.__findClosestContainingNode"></a>
<h4>PythonAstViewer.__findClosestContainingNode</h4>
<b>__findClosestContainingNode</b>(<i>node, textRange</i>)

<p>
        Private method to search for the AST node that contains a range
        closest.
</p>
<dl>

<dt><i>node</i> (ast.AST)</dt>
<dd>
AST node to start searching at
</dd>
<dt><i>textRange</i> (tuple of (int, int, int, int))</dt>
<dd>
tuple giving the start and end positions
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
best matching node
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
ast.AST
</dd>
</dl>
<a NAME="PythonAstViewer.__grabFocus" ID="PythonAstViewer.__grabFocus"></a>
<h4>PythonAstViewer.__grabFocus</h4>
<b>__grabFocus</b>(<i></i>)

<p>
        Private method to grab the input focus.
</p>
<a NAME="PythonAstViewer.__lastEditorClosed" ID="PythonAstViewer.__lastEditorClosed"></a>
<h4>PythonAstViewer.__lastEditorClosed</h4>
<b>__lastEditorClosed</b>(<i></i>)

<p>
        Private slot to handle the last editor closed signal of the view
        manager.
</p>
<a NAME="PythonAstViewer.__loadAST" ID="PythonAstViewer.__loadAST"></a>
<h4>PythonAstViewer.__loadAST</h4>
<b>__loadAST</b>(<i></i>)

<p>
        Private method to generate the AST from the source of the current
        editor and visualize it.
</p>
<a NAME="PythonAstViewer.__markTextRanges" ID="PythonAstViewer.__markTextRanges"></a>
<h4>PythonAstViewer.__markTextRanges</h4>
<b>__markTextRanges</b>(<i>tree, source</i>)

<p>
        Private method to modify the AST nodes with end_lineno and
        end_col_offset information.
</p>
<p>
        Note: The modifications are only done for nodes containing lineno and
        col_offset attributes.
</p>
<dl>

<dt><i>tree</i> (ast.AST)</dt>
<dd>
reference to the AST to be modified
</dd>
<dt><i>source</i> (str)</dt>
<dd>
source code the AST was created from
</dd>
</dl>
<a NAME="PythonAstViewer.__populateNode" ID="PythonAstViewer.__populateNode"></a>
<h4>PythonAstViewer.__populateNode</h4>
<b>__populateNode</b>(<i>name, nodeOrFields, parent</i>)

<p>
        Private method to populate the tree view with a node.
</p>
<dl>

<dt><i>name</i> (str)</dt>
<dd>
name of the node
</dd>
<dt><i>nodeOrFields</i> (ast.AST or list)</dt>
<dd>
reference to the node or a list node fields
</dd>
<dt><i>parent</i> (QTreeWidget or QTreeWidgetItem)</dt>
<dd>
reference to the parent item
</dd>
</dl>
<a NAME="PythonAstViewer.__rangeContainsSmaller" ID="PythonAstViewer.__rangeContainsSmaller"></a>
<h4>PythonAstViewer.__rangeContainsSmaller</h4>
<b>__rangeContainsSmaller</b>(<i>first, second</i>)

<p>
        Private method to check, if second is contained in first.
</p>
<dl>

<dt><i>first</i> (tuple of (int, int, int, int))</dt>
<dd>
text range to check against
</dd>
<dt><i>second</i> (tuple of (int, int, int, int))</dt>
<dd>
text range to check for
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
flag indicating second is contained in first
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="PythonAstViewer.__rangeContainsSmallerOrEqual" ID="PythonAstViewer.__rangeContainsSmallerOrEqual"></a>
<h4>PythonAstViewer.__rangeContainsSmallerOrEqual</h4>
<b>__rangeContainsSmallerOrEqual</b>(<i>first, second</i>)

<p>
        Private method to check, if second is contained in or equal to first.
</p>
<dl>

<dt><i>first</i> (tuple of (int, int, int, int))</dt>
<dd>
text range to check against
</dd>
<dt><i>second</i> (tuple of (int, int, int, int))</dt>
<dd>
text range to check for
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
flag indicating second is contained in or equal to first
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="PythonAstViewer.__resizeColumns" ID="PythonAstViewer.__resizeColumns"></a>
<h4>PythonAstViewer.__resizeColumns</h4>
<b>__resizeColumns</b>(<i></i>)

<p>
        Private method to resize the columns to suitable values.
</p>
<a NAME="PythonAstViewer.__selectItemForEditorSelection" ID="PythonAstViewer.__selectItemForEditorSelection"></a>
<h4>PythonAstViewer.__selectItemForEditorSelection</h4>
<b>__selectItemForEditorSelection</b>(<i></i>)

<p>
        Private slot to select the item corresponding to an editor selection.
</p>
<a NAME="PythonAstViewer.hide" ID="PythonAstViewer.hide"></a>
<h4>PythonAstViewer.hide</h4>
<b>hide</b>(<i></i>)

<p>
        Public slot to hide the AST viewer.
</p>
<a NAME="PythonAstViewer.preferencesChanged" ID="PythonAstViewer.preferencesChanged"></a>
<h4>PythonAstViewer.preferencesChanged</h4>
<b>preferencesChanged</b>(<i></i>)

<p>
        Public slot handling changes of the AST viewer settings.
</p>
<a NAME="PythonAstViewer.resizeEvent" ID="PythonAstViewer.resizeEvent"></a>
<h4>PythonAstViewer.resizeEvent</h4>
<b>resizeEvent</b>(<i>evt</i>)

<p>
        Protected method to handle resize events.
</p>
<dl>

<dt><i>evt</i> (QResizeEvent)</dt>
<dd>
resize event
</dd>
</dl>
<a NAME="PythonAstViewer.show" ID="PythonAstViewer.show"></a>
<h4>PythonAstViewer.show</h4>
<b>show</b>(<i></i>)

<p>
        Public slot to show the AST viewer.
</p>
<a NAME="PythonAstViewer.shutdown" ID="PythonAstViewer.shutdown"></a>
<h4>PythonAstViewer.shutdown</h4>
<b>shutdown</b>(<i></i>)

<p>
        Public method to perform shutdown actions.
</p>
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