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literals.py

# 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)
    else:
        try:
            i = int(tail, 8)
        except ValueError:
            raise ValueError("invalid octal string escape ('\\%s')" % tail)
    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	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/linksafe	0755	2024-08-13 07:01:09
..	dir	-	root/linksafe	0755	2024-08-13 07:01:09
__pycache__	dir	-	root/linksafe	0755	2024-08-13 07:01:09
__init__.py	text/plain	143 B	root/linksafe	0644	2024-05-31 01:51:44
conv.py	text/x-script.python	9.42 KB	root/linksafe	0644	2024-05-31 01:51:45
driver.py	text/x-script.python	5.09 KB	root/linksafe	0644	2024-05-31 01:51:44
grammar.py	text/x-script.python	6.3 KB	root/linksafe	0644	2024-05-31 01:51:44
literals.py	text/x-script.python	1.58 KB	root/linksafe	0644	2024-05-31 01:51:44
parse.py	text/x-script.python	7.86 KB	root/linksafe	0644	2024-05-31 01:51:45
pgen.py	text/x-script.python	13.49 KB	root/linksafe	0644	2024-05-31 01:51:45
token.py	text/x-script.python	1.27 KB	root/linksafe	0755	2024-05-31 01:51:44
tokenize.py	text/x-script.python	21.29 KB	root/linksafe	0644	2024-05-31 01:51:45

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