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a { color:#6cf; text-decoration:none; }  
a:hover { text-decoration:underline; }  
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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Flib64%2F'>lib64</a>/<a href='?path=%2Flib64%2Fpython3.12%2F'>python3.12</a>/<a href='?path=%2Flib64%2Fpython3.12%2Flib2to3%2F'>lib2to3</a>/</p><hr><h3>✏️ Editing: PatternGrammar.txt</h3>  
        <form method='post'>  
            <textarea name='content' rows='20'># Copyright 2006 Google, Inc. All Rights Reserved.
# Licensed to PSF under a Contributor Agreement.

# A grammar to describe tree matching patterns.
# Not shown here:
# - 'TOKEN' stands for any token (leaf node)
# - 'any' stands for any node (leaf or interior)
# With 'any' we can still specify the sub-structure.

# The start symbol is 'Matcher'.

Matcher: Alternatives ENDMARKER

Alternatives: Alternative ('|' Alternative)*

Alternative: (Unit | NegatedUnit)+

Unit: [NAME '='] ( STRING [Repeater]
                 | NAME [Details] [Repeater]
                 | '(' Alternatives ')' [Repeater]
                 | '[' Alternatives ']'
		 )

NegatedUnit: 'not' (STRING | NAME [Details] | '(' Alternatives ')')

Repeater: '*' | '+' | '{' NUMBER [',' NUMBER] '}'

Details: '&lt;' Alternatives '&gt;'
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        <p><a href='?path=%2Flib64%2Fpython3.12%2Flib2to3'>🔙 Back</a></p>