SF.net SVN: docutils:[9712 ] trunk/docutils

Revision: 9712
          http://sourceforge.net/p/docutils/code/9712
Author:   milde
Date:     2024-05-18 08:44:56 +0000 (Sat, 18 May 2024)
Log Message:
-----------
Prevent accidental drop of first child when initializing `nodes.Element`.

Raise ValueError if the "rawsource" argument in `nodes.Element.__init__()`
is an `Element` instance.
Prevents surprises when initializing an element with child element(s)
but forgetting about the mandatory "rawsource" argument.

Modified Paths:
--------------
    trunk/docutils/HISTORY.txt
    trunk/docutils/docutils/nodes.py

Modified: trunk/docutils/HISTORY.txt
===================================================================
--- trunk/docutils/HISTORY.txt	2024-05-17 07:15:06 UTC (rev 9711)
+++ trunk/docutils/HISTORY.txt	2024-05-18 08:44:56 UTC (rev 9712)
@@ -24,6 +24,9 @@
 
 * docutils/nodes.py
 
+  - Raise ValueError if the "rawsource" argument in `Element.__init__()`
+    is an `Element` instance.
+    Catches errors like ``nodes.hint(nodes.paragraph())``.
   - New element category classes `SubStructural` and `PureTextElement`.
   - Fix element categories.
   - New method `Element.validate()` (work in progress).

Modified: trunk/docutils/docutils/nodes.py
===================================================================
--- trunk/docutils/docutils/nodes.py	2024-05-17 07:15:06 UTC (rev 9711)
+++ trunk/docutils/docutils/nodes.py	2024-05-18 08:44:56 UTC (rev 9712)
@@ -514,6 +514,8 @@
 
         NOTE: some elements do not set this value (default '').
         """
+        if isinstance(rawsource, Element):
+            raise ValueError('First argument "rawsource" must be a string.')
 
         self.children = []
         """List of child nodes (elements and/or `Text`)."""
@@ -1318,7 +1320,7 @@
     """Separator for child nodes, used by `astext()` method."""
 
     def __init__(self, rawsource='', text='', *children, **attributes):
-        if text != '':
+        if text:
             textnode = Text(text)
             Element.__init__(self, rawsource, textnode, *children,
                              **attributes)

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