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Edit File : literals.py \| Size : 1.58 KB
# 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] == q3: q = q3 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() Back

Edit File : literals.py | Size : 1.58 KB

# 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()

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