build(python): simplify rpycdec vendor layout

third_party/python/rpycdec/src/renpy/lexer.py

@@ -0,0 +1,50 @@
+import os
+from typing import NamedTuple
+
+import renpy
+
+
+class SubParse(object):
+    """
+    This represents the information about a subparse that can be provided to
+    a creator-defined statement.
+    """
+
+    def __init__(self, block):
+        self.block = block
+
+    def __repr__(self):
+        if not self.block:
+            return "<SubParse empty>"
+        else:
+            return "<SubParse {}:{}>".format(
+                self.block[0].filename, self.block[0].linenumber
+            )
+
+
+def unelide_filename(fn: str) -> str:
+    fn = os.path.normpath(fn)
+
+    if renpy.config.alternate_unelide_path is not None:
+        fn0 = os.path.join(renpy.config.alternate_unelide_path, fn)
+        if os.path.exists(fn0):
+            return fn0
+
+    fn1 = os.path.join(renpy.config.basedir, fn)
+    if os.path.exists(fn1):
+        return fn1
+
+    fn2 = os.path.join(renpy.config.renpy_base, fn)
+    if os.path.exists(fn2):
+        return fn2
+
+    return fn
+
+
+class GroupedLine(NamedTuple):
+    # The filename the line is from.
+    filename: str
+    number: int
+    indent: int
+    text: str
+    block: list["GroupedLine"]