PEP 293 implemention (from SF patch http://www.python.org/sf/432401)

1 files changed, 483 insertions, 0 deletions

diff --git a/Lib/test/test_codeccallbacks.py b/Lib/test/test_codeccallbacks.py
new file mode 100644
index 0000000..1650965
--- /dev/null
+++ b/Lib/test/test_codeccallbacks.py
@@ -0,0 +1,483 @@
+import test.test_support, unittest
+import sys, codecs, htmlentitydefs, unicodedata
+
+class CodecCallbackTest(unittest.TestCase):
+
+    def test_xmlcharrefreplace(self):
+        # replace unencodable characters which numeric character entities.
+        # For ascii, latin-1 and charmaps this is completely implemented
+        # in C and should be reasonably fast.
+        s = u"\u30b9\u30d1\u30e2 \xe4nd eggs"
+        self.assertEqual(
+            s.encode("ascii", "xmlcharrefreplace"),
+            "スパモ änd eggs"
+        )
+        self.assertEqual(
+            s.encode("latin-1", "xmlcharrefreplace"),
+            "スパモ \xe4nd eggs"
+        )
+
+    def test_xmlcharnamereplace(self):
+        # This time use a named character entity for unencodable
+        # characters, if one is available.
+        names = {}
+        for (key, value) in htmlentitydefs.entitydefs.items():
+            if len(value)==1:
+                names[unicode(value, "latin-1")] = unicode(key, "latin-1")
+            else:
+                names[unichr(int(value[2:-1]))] = unicode(key, "latin-1")
+
+        def xmlcharnamereplace(exc):
+            if not isinstance(exc, UnicodeEncodeError):
+                raise TypeError("don't know how to handle %r" % exc)
+            l = []
+            for c in exc.object[exc.start:exc.end]:
+                try:
+                    l.append(u"&%s;" % names[c])
+                except KeyError:
+                    l.append(u"&#%d;" % ord(c))
+            return (u"".join(l), exc.end)
+
+        codecs.register_error(
+            "test.xmlcharnamereplace", xmlcharnamereplace)
+
+        sin = u"\xab\u211c\xbb = \u2329\u1234\u20ac\u232a"
+        sout = "«ℜ» = ⟨ሴ€⟩"
+        self.assertEqual(sin.encode("ascii", "test.xmlcharnamereplace"), sout)
+        sout = "\xabℜ\xbb = ⟨ሴ€⟩"
+        self.assertEqual(sin.encode("latin-1", "test.xmlcharnamereplace"), sout)
+        sout = "\xabℜ\xbb = ⟨ሴ\xa4⟩"
+        self.assertEqual(sin.encode("iso-8859-15", "test.xmlcharnamereplace"), sout)
+
+    def test_uninamereplace(self):
+        # We're using the names from the unicode database this time,
+        # and we're doing "systax highlighting" here, i.e. we include
+        # the replaced text in ANSI escape sequences. For this it is
+        # useful that the error handler is not called for every single
+        # unencodable character, but for a complete sequence of
+        # unencodable characters, otherwise we would output many
+        # unneccessary escape sequences.
+
+        def uninamereplace(exc):
+            if not isinstance(exc, UnicodeEncodeError):
+                raise TypeError("don't know how to handle %r" % exc)
+            l = []
+            for c in exc.object[exc.start:exc.end]:
+                l.append(unicodedata.name(c, u"0x%x" % ord(c)))
+            return (u"\033[1m%s\033[0m" % u", ".join(l), exc.end)
+
+        codecs.register_error(
+            "test.uninamereplace", uninamereplace)
+
+        sin = u"\xac\u1234\u20ac\u8000"
+        sout = "\033[1mNOT SIGN, ETHIOPIC SYLLABLE SEE, EURO SIGN, 0x8000\033[0m"
+        self.assertEqual(sin.encode("ascii", "test.uninamereplace"), sout)
+
+        sout = "\xac\033[1mETHIOPIC SYLLABLE SEE, EURO SIGN, 0x8000\033[0m"
+        self.assertEqual(sin.encode("latin-1", "test.uninamereplace"), sout)
+
+        sout = "\xac\033[1mETHIOPIC SYLLABLE SEE\033[0m\xa4\033[1m0x8000\033[0m"
+        self.assertEqual(sin.encode("iso-8859-15", "test.uninamereplace"), sout)
+
+    def test_backslashescape(self):
+        # Does the same as the "unicode-escape" encoding, but with different
+        # base encodings.
+        sin = u"a\xac\u1234\u20ac\u8000"
+        if sys.maxunicode > 0xffff:
+            sin += unichr(sys.maxunicode)
+        sout = "a\\xac\\u1234\\u20ac\\u8000"
+        if sys.maxunicode > 0xffff:
+            sout += "\\U%08x" % sys.maxunicode
+        self.assertEqual(sin.encode("ascii", "backslashreplace"), sout)
+
+        sout = "a\xac\\u1234\\u20ac\\u8000"
+        if sys.maxunicode > 0xffff:
+            sout += "\\U%08x" % sys.maxunicode
+        self.assertEqual(sin.encode("latin-1", "backslashreplace"), sout)
+
+        sout = "a\xac\\u1234\xa4\\u8000"
+        if sys.maxunicode > 0xffff:
+            sout += "\\U%08x" % sys.maxunicode
+        self.assertEqual(sin.encode("iso-8859-15", "backslashreplace"), sout)
+
+    def test_relaxedutf8(self):
+        # This is the test for a decoding callback handler,
+        # that relaxes the UTF-8 minimal encoding restriction.
+        # A null byte that is encoded as "\xc0\x80" will be
+        # decoded as a null byte. All other illegal sequences
+        # will be handled strictly.
+        def relaxedutf8(exc):
+            if not isinstance(exc, UnicodeDecodeError):
+                raise TypeError("don't know how to handle %r" % exc)
+            if exc.object[exc.start:exc.end].startswith("\xc0\x80"):
+                return (u"\x00", exc.start+2) # retry after two bytes
+            else:
+                raise exc
+
+        codecs.register_error(
+            "test.relaxedutf8", relaxedutf8)
+
+        sin = "a\x00b\xc0\x80c\xc3\xbc\xc0\x80\xc0\x80"
+        sout = u"a\x00b\x00c\xfc\x00\x00"
+        self.assertEqual(sin.decode("utf-8", "test.relaxedutf8"), sout)
+        sin = "\xc0\x80\xc0\x81"
+        self.assertRaises(UnicodeError, sin.decode, "utf-8", "test.relaxedutf8")
+
+    def test_charmapencode(self):
+        # For charmap encodings the replacement string will be
+        # mapped through the encoding again. This means, that
+        # to be able to use e.g. the "replace" handler, the
+        # charmap has to have a mapping for "?".
+        charmap = dict([ (ord(c), 2*c.upper()) for c in "abcdefgh"])
+        sin = u"abc"
+        sout = "AABBCC"
+        self.assertEquals(codecs.charmap_encode(sin, "strict", charmap)[0], sout)
+
+        sin = u"abcA"
+        self.assertRaises(UnicodeError, codecs.charmap_encode, sin, "strict", charmap)
+
+        charmap[ord("?")] = "XYZ"
+        sin = u"abcDEF"
+        sout = "AABBCCXYZXYZXYZ"
+        self.assertEquals(codecs.charmap_encode(sin, "replace", charmap)[0], sout)
+
+        charmap[ord("?")] = u"XYZ"
+        self.assertRaises(TypeError, codecs.charmap_encode, sin, "replace", charmap)
+
+        charmap[ord("?")] = u"XYZ"
+        self.assertRaises(TypeError, codecs.charmap_encode, sin, "replace", charmap)
+
+    def test_callbacks(self):
+        def handler1(exc):
+            if not isinstance(exc, UnicodeEncodeError) \
+               and not isinstance(exc, UnicodeDecodeError):
+                raise TypeError("don't know how to handle %r" % exc)
+            l = [u"<%d>" % ord(exc.object[pos]) for pos in xrange(exc.start, exc.end)]
+            return (u"[%s]" % u"".join(l), exc.end)
+
+        codecs.register_error("test.handler1", handler1)
+
+        def handler2(exc):
+            if not isinstance(exc, UnicodeDecodeError):
+                raise TypeError("don't know how to handle %r" % exc)
+            l = [u"<%d>" % ord(exc.object[pos]) for pos in xrange(exc.start, exc.end)]
+            return (u"[%s]" % u"".join(l), exc.end+1) # skip one character
+
+        codecs.register_error("test.handler2", handler2)
+
+        s = "\x00\x81\x7f\x80\xff"
+
+        self.assertEqual(
+            s.decode("ascii", "test.handler1"),
+            u"\x00[<129>]\x7f[<128>][<255>]"
+        )
+        self.assertEqual(
+            s.decode("ascii", "test.handler2"),
+            u"\x00[<129>][<128>]"
+        )
+
+        self.assertEqual(
+            "\\u3042\u3xxx".decode("unicode-escape", "test.handler1"),
+            u"\u3042[<92><117><51><120>]xx"
+        )
+
+        self.assertEqual(
+            "\\u3042\u3xx".decode("unicode-escape", "test.handler1"),
+            u"\u3042[<92><117><51><120><120>]"
+        )
+
+        self.assertEqual(
+            codecs.charmap_decode("abc", "test.handler1", {ord("a"): u"z"})[0],
+            u"z[<98>][<99>]"
+        )
+
+        self.assertEqual(
+            u"g\xfc\xdfrk".encode("ascii", "test.handler1"),
+            u"g[<252><223>]rk"
+        )
+
+        self.assertEqual(
+            u"g\xfc\xdf".encode("ascii", "test.handler1"),
+            u"g[<252><223>]"
+        )
+
+    def test_longstrings(self):
+        # test long strings to check for memory overflow problems
+        errors = [ "strict", "ignore", "replace", "xmlcharrefreplace", "backslashreplace"]
+        # register the handlers under different names,
+        # to prevent the codec from recognizing the name
+        for err in errors:
+            codecs.register_error("test." + err, codecs.lookup_error(err))
+        l = 1000
+        errors += [ "test." + err for err in errors ]
+        for uni in [ s*l for s in (u"x", u"\u3042", u"a\xe4") ]:
+            for enc in ("ascii", "latin-1", "iso-8859-1", "iso-8859-15", "utf-8", "utf-7", "utf-16"):
+                for err in errors:
+                   try:
+                       uni.encode(enc, err)
+                   except UnicodeError:
+                       pass
+
+    def check_exceptionobjectargs(self, exctype, args, msg):
+        # Test UnicodeError subclasses: construction, attribute assignment and __str__ conversion
+        # check with one missing argument
+        self.assertRaises(TypeError, exctype, *args[:-1])
+        # check with one missing argument
+        self.assertRaises(TypeError, exctype, *(args + ["too much"]))
+        # check with one argument of the wrong type
+        wrongargs = [ "spam", u"eggs", 42, 1.0, None ]
+        for i in xrange(len(args)):
+            for wrongarg in wrongargs:
+                if type(wrongarg) is type(args[i]):
+                   continue
+                # build argument array
+                callargs = []
+                for j in xrange(len(args)):
+                    if i==j:
+                        callargs.append(wrongarg)
+                    else:
+                        callargs.append(args[i])
+                self.assertRaises(TypeError, exctype, *callargs)
+        exc = exctype(*args)
+        self.assertEquals(str(exc), msg)
+
+    def test_unicodeencodeerror(self):
+        self.check_exceptionobjectargs(
+            UnicodeEncodeError,
+            ["ascii", u"g\xfcrk", 1, 2, "ouch"],
+            "'ascii' codec can't encode character '\ufc' in position 1: ouch"
+        )
+        self.check_exceptionobjectargs(
+            UnicodeEncodeError,
+            ["ascii", u"g\xfcrk", 1, 4, "ouch"],
+            "'ascii' codec can't encode characters in position 1-3: ouch"
+        )
+        self.check_exceptionobjectargs(
+            UnicodeEncodeError,
+            ["ascii", u"\xfcx", 0, 1, "ouch"],
+            "'ascii' codec can't encode character '\ufc' in position 0: ouch"
+        )
+
+    def test_unicodedecodeerror(self):
+        self.check_exceptionobjectargs(
+            UnicodeDecodeError,
+            ["ascii", "g\xfcrk", 1, 2, "ouch"],
+            "'ascii' codec can't decode byte 0xfc in position 1: ouch"
+        )
+        self.check_exceptionobjectargs(
+            UnicodeDecodeError,
+            ["ascii", "g\xfcrk", 1, 3, "ouch"],
+            "'ascii' codec can't decode bytes in position 1-2: ouch"
+        )
+
+    def test_unicodetranslateerror(self):
+        self.check_exceptionobjectargs(
+            UnicodeTranslateError,
+            [u"g\xfcrk", 1, 2, "ouch"],
+            "can't translate character '\\ufc' in position 1: ouch"
+        )
+        self.check_exceptionobjectargs(
+            UnicodeTranslateError,
+            [u"g\xfcrk", 1, 3, "ouch"],
+            "can't translate characters in position 1-2: ouch"
+        )
+
+    def test_badandgoodstrictexceptions(self):
+        self.assertRaises(
+            TypeError,
+            codecs.strict_errors,
+            42
+        )
+        self.assertRaises(
+            Exception,
+            codecs.strict_errors,
+            Exception("ouch")
+        )
+
+        self.assertRaises(
+            UnicodeEncodeError,
+            codecs.strict_errors,
+            UnicodeEncodeError("ascii", u"\u3042", 0, 1, "ouch")
+        )
+
+    def test_badandgoodignoreexceptions(self):
+        self.assertRaises(
+           TypeError,
+           codecs.ignore_errors,
+           42
+        )
+        self.assertRaises(
+           TypeError,
+           codecs.ignore_errors,
+           UnicodeError("ouch")
+        )
+        self.assertEquals(
+            codecs.ignore_errors(UnicodeEncodeError("ascii", u"\u3042", 0, 1, "ouch")),
+            (u"", 1)
+        )
+        self.assertEquals(
+            codecs.ignore_errors(UnicodeDecodeError("ascii", "\xff", 0, 1, "ouch")),
+            (u"", 1)
+        )
+        self.assertEquals(
+            codecs.ignore_errors(UnicodeTranslateError(u"\u3042", 0, 1, "ouch")),
+            (u"", 1)
+        )
+
+    def test_badandgoodreplaceexceptions(self):
+        self.assertRaises(
+           TypeError,
+           codecs.replace_errors,
+           42
+        )
+        self.assertRaises(
+           TypeError,
+           codecs.replace_errors,
+           UnicodeError("ouch")
+        )
+        self.assertEquals(
+            codecs.replace_errors(UnicodeEncodeError("ascii", u"\u3042", 0, 1, "ouch")),
+            (u"?", 1)
+        )
+        self.assertEquals(
+            codecs.replace_errors(UnicodeDecodeError("ascii", "\xff", 0, 1, "ouch")),
+            (u"\ufffd", 1)
+        )
+        self.assertEquals(
+            codecs.replace_errors(UnicodeTranslateError(u"\u3042", 0, 1, "ouch")),
+            (u"\ufffd", 1)
+        )
+
+    def test_badandgoodxmlcharrefreplaceexceptions(self):
+        self.assertRaises(
+           TypeError,
+           codecs.xmlcharrefreplace_errors,
+           42
+        )
+        self.assertRaises(
+           TypeError,
+           codecs.xmlcharrefreplace_errors,
+           UnicodeError("ouch")
+        )
+        self.assertEquals(
+            codecs.xmlcharrefreplace_errors(UnicodeEncodeError("ascii", u"\u3042", 0, 1, "ouch")),
+            (u"&#%d;" % 0x3042, 1)
+        )
+        self.assertRaises(
+            TypeError,
+            codecs.xmlcharrefreplace_errors,
+            UnicodeError("ouch")
+        )
+        self.assertRaises(
+            TypeError,
+            codecs.xmlcharrefreplace_errors,
+            UnicodeDecodeError("ascii", "\xff", 0, 1, "ouch")
+        )
+        self.assertRaises(
+            TypeError,
+            codecs.xmlcharrefreplace_errors,
+            UnicodeTranslateError(u"\u3042", 0, 1, "ouch")
+        )
+
+    def test_badandgoodbackslashreplaceexceptions(self):
+        self.assertRaises(
+           TypeError,
+           codecs.backslashreplace_errors,
+           42
+        )
+        self.assertRaises(
+           TypeError,
+           codecs.backslashreplace_errors,
+           UnicodeError("ouch")
+        )
+        self.assertEquals(
+            codecs.backslashreplace_errors(UnicodeEncodeError("ascii", u"\u3042", 0, 1, "ouch")),
+            (u"\\u3042", 1)
+        )
+        self.assertEquals(
+            codecs.backslashreplace_errors(UnicodeEncodeError("ascii", u"\x00", 0, 1, "ouch")),
+            (u"\\x00", 1)
+        )
+        self.assertEquals(
+            codecs.backslashreplace_errors(UnicodeEncodeError("ascii", u"\xff", 0, 1, "ouch")),
+            (u"\\xff", 1)
+        )
+        self.assertEquals(
+            codecs.backslashreplace_errors(UnicodeEncodeError("ascii", u"\u0100", 0, 1, "ouch")),
+            (u"\\u0100", 1)
+        )
+        self.assertEquals(
+            codecs.backslashreplace_errors(UnicodeEncodeError("ascii", u"\uffff", 0, 1, "ouch")),
+            (u"\\uffff", 1)
+        )
+        if sys.maxunicode>0xffff:
+            self.assertEquals(
+                codecs.backslashreplace_errors(UnicodeEncodeError("ascii", u"\U00010000", 0, 1, "ouch")),
+                (u"\\U00010000", 1)
+            )
+            self.assertEquals(
+                codecs.backslashreplace_errors(UnicodeEncodeError("ascii", u"\U0010ffff", 0, 1, "ouch")),
+                (u"\\U0010ffff", 1)
+            )
+
+        self.assertRaises(
+            TypeError,
+            codecs.backslashreplace_errors,
+            UnicodeError("ouch")
+        )
+        self.assertRaises(
+            TypeError,
+            codecs.backslashreplace_errors,
+            UnicodeDecodeError("ascii", "\xff", 0, 1, "ouch")
+        )
+        self.assertRaises(
+            TypeError,
+            codecs.backslashreplace_errors,
+            UnicodeTranslateError(u"\u3042", 0, 1, "ouch")
+        )
+
+    def test_badhandlerresults(self):
+        results = ( 42, u"foo", (1,2,3), (u"foo", 1, 3), (u"foo", None), (u"foo",), ("foo", 1, 3), ("foo", None), ("foo",) )
+        encs = ("ascii", "latin-1", "iso-8859-1", "iso-8859-15")
+
+        for res in results:
+            codecs.register_error("test.badhandler", lambda: res)
+            for enc in encs:
+                self.assertRaises(
+                    TypeError,
+                    u"\u3042".encode,
+                    enc,
+                    "test.badhandler"
+                )
+            for (enc, bytes) in (
+                ("ascii", "\xff"),
+                ("utf-8", "\xff"),
+                ("utf-7", "+x-")
+            ):
+                self.assertRaises(
+                    TypeError,
+                    bytes.decode,
+                    enc,
+                    "test.badhandler"
+                )
+
+    def test_lookup(self):
+        self.assertEquals(codecs.strict_errors, codecs.lookup_error("strict"))
+        self.assertEquals(codecs.ignore_errors, codecs.lookup_error("ignore"))
+        self.assertEquals(codecs.strict_errors, codecs.lookup_error("strict"))
+        self.assertEquals(
+            codecs.xmlcharrefreplace_errors,
+            codecs.lookup_error("xmlcharrefreplace")
+        )
+        self.assertEquals(
+            codecs.backslashreplace_errors,
+            codecs.lookup_error("backslashreplace")
+        )
+
+def test_main():
+    suite = unittest.TestSuite()
+    suite.addTest(unittest.makeSuite(CodecCallbackTest))
+    test.test_support.run_suite(suite)
+
+if __name__ == "__main__":
+    test_main()