From 4a52a71956a8d46fcb7294ac71734504bb09bcc2 Mon Sep 17 00:00:00 2001
From: S. Solomon Darnell
Date: Fri, 28 Mar 2025 21:52:21 -0500
Subject: two version of R2R are here

---
 .../lib/python3.12/site-packages/lark/ast_utils.py | 55 ++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 .venv/lib/python3.12/site-packages/lark/ast_utils.py

(limited to '.venv/lib/python3.12/site-packages/lark/ast_utils.py')

diff --git a/.venv/lib/python3.12/site-packages/lark/ast_utils.py b/.venv/lib/python3.12/site-packages/lark/ast_utils.py
new file mode 100644
index 00000000..0c03d458
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/lark/ast_utils.py
@@ -0,0 +1,55 @@
+"""
+    Module of utilities for transforming a lark.Tree into a custom Abstract Syntax Tree
+"""
+
+import inspect, re
+
+from lark import Transformer, v_args
+
+class Ast(object):
+    """Abstract class
+
+    Subclasses will be collected by `create_transformer()`
+    """
+    pass
+
+class AsList(object):
+    """Abstract class
+
+    Subclasses will be instanciated with the parse results as a single list, instead of as arguments.
+    """
+
+class WithMeta(object):
+    """Abstract class
+
+    Subclasses will be instanciated with the Meta instance of the tree. (see ``v_args`` for more detail)
+    """
+    pass
+
+def camel_to_snake(name):
+    return re.sub(r'(?<!^)(?=[A-Z])', '_', name).lower()
+
+def create_transformer(ast_module, transformer=None, decorator_factory=v_args):
+    """Collects `Ast` subclasses from the given module, and creates a Lark transformer that builds the AST.
+
+    For each class, we create a corresponding rule in the transformer, with a matching name.
+    CamelCase names will be converted into snake_case. Example: "CodeBlock" -> "code_block".
+
+    Classes starting with an underscore (`_`) will be skipped.
+
+    Parameters:
+        ast_module: A Python module containing all the subclasses of ``ast_utils.Ast``
+        transformer (Optional[Transformer]): An initial transformer. Its attributes may be overwritten.
+        decorator_factory (Callable): An optional callable accepting two booleans, inline, and meta, 
+            and returning a decorator for the methods of ``transformer``. (default: ``v_args``).
+    """
+    t = transformer or Transformer()
+
+    for name, obj in inspect.getmembers(ast_module):
+        if not name.startswith('_') and inspect.isclass(obj):
+            if issubclass(obj, Ast):
+                wrapper = decorator_factory(inline=not issubclass(obj, AsList), meta=issubclass(obj, WithMeta))
+                obj = wrapper(obj).__get__(t)
+                setattr(t, camel_to_snake(name), obj)
+
+    return t
\ No newline at end of file
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