📁 byp4a55 @h0rn3t

# Copyright 2004-2005 Elemental Security, Inc. All Rights Reserved.
# Licensed to PSF under a Contributor Agreement.

"""Safely evaluate Python string literals without using eval()."""

import re

simple_escapes = {"a": "\a",
                  "b": "\b",
                  "f": "\f",
                  "n": "\n",
                  "r": "\r",
                  "t": "\t",
                  "v": "\v",
                  "'": "'",
                  '"': '"',
                  "\\": "\\"}

def escape(m):
    all, tail = m.group(0, 1)
    assert all.startswith("\\")
    esc = simple_escapes.get(tail)
    if esc is not None:
        return esc
    if tail.startswith("x"):
        hexes = tail[1:]
        if len(hexes) < 2:
            raise ValueError("invalid hex string escape ('\\%s')" % tail)
        try:
            i = int(hexes, 16)
        except ValueError:
            raise ValueError("invalid hex string escape ('\\%s')" % tail) from None
    else:
        try:
            i = int(tail, 8)
        except ValueError:
            raise ValueError("invalid octal string escape ('\\%s')" % tail) from None
    return chr(i)

def evalString(s):
    assert s.startswith("'") or s.startswith('"'), repr(s[:1])
    q = s[0]
    if s[:3] == q*3:
        q = q*3
    assert s.endswith(q), repr(s[-len(q):])
    assert len(s) >= 2*len(q)
    s = s[len(q):-len(q)]
    return re.sub(r"\\(\'|\"|\\|[abfnrtv]|x.{0,2}|[0-7]{1,3})", escape, s)

def test():
    for i in range(256):
        c = chr(i)
        s = repr(c)
        e = evalString(s)
        if e != c:
            print(i, c, s, e)

if __name__ == "__main__":
    test()

Name	Size (kB)	Modified	Year	Actions
📁 ..	-	2025-08-05 06:45:29	2025	-
📁 __pycache__	-	2025-08-05 06:45:29	2025	-
📄 __init__.py	0.14	2025-06-03 18:38:25	2025	✏️ Edit \| 🗑️ \| ⬇️ \|
📄 conv.py	9.42	2025-06-03 18:38:25	2025	✏️ Edit \| 🗑️ \| ⬇️ \|
📄 driver.py	5.83	2025-06-03 18:38:25	2025	✏️ Edit \| 🗑️ \| ⬇️ \|
📄 grammar.py	5.42	2025-06-03 18:38:25	2025	✏️ Edit \| 🗑️ \| ⬇️ \|
📄 literals.py	1.6	2025-06-03 18:38:25	2025	✏️ Edit \| 🗑️ \| ⬇️ \|
📄 parse.py	7.96	2025-06-03 18:38:25	2025	✏️ Edit \| 🗑️ \| ⬇️ \|
📄 pgen.py	13.51	2025-06-03 18:38:25	2025	✏️ Edit \| 🗑️ \| ⬇️ \|
📄 token.py	1.29	2025-06-03 18:38:25	2025	✏️ Edit \| 🗑️ \| ⬇️ \|
📄 tokenize.py	20.62	2025-06-03 18:38:25	2025	✏️ Edit \| 🗑️ \| ⬇️ \|

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