Viewing file:  utf8_iso.py (11.42 KB) -rw-r--r--
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"""This module provides UTF-8 conversion into ISO-8859-x. It is
partially generated by the code executed when generated is set to
1. The module serves for compatibility with Python 1.5.2 only; Python
2 users should use the Unicode facilities instead. In fact, the tables
generated have to be generated with Python 2."""
# Generator part; activate by setting generate to 1 in this source code.
generate = 0
if generate:
import codecs
isocodes = []
for i in range(1,20):
try:
name = "iso-8859-%d" % i
codecs.lookup(name)
isocodes.append(name)
except LookupError:
isocodes.append(None)
print "code_to_uni=[None,"
for code in isocodes:
if code is None:
print "None,"
continue
print '[',
for char in range(128,256):
print "%d," % ord(unicode(chr(char),code)),
print "],"
print "]"
class ConvertError(ValueError):
pass
# Mapping table for unicode code points to iso-8859-x code points.
# Keys are encoding number (x), then the code point
uni_to_code=[None]*20
def utf8chr(c):
if c < 0x800:
return chr(0xc0 | (c>>6)) + chr(0x80 | (c & 0x3f))
return chr(0xe0 | (c>>12)) + chr(0x80 | ((c>>6) & 0x3f)) + chr(0x80 | (c & 0x3f))
def code_to_utf8(encoding, c):
"""code_to_utf8(encoding, char) -> string
Convert c from encoding to utf8; return UTF-8 string."""
c = ord(c)
if c<128:
return chr(c)
if code_to_uni[encoding] is None:
raise ConvertError("unknown encoding ISO-8859-%d" % encoding)
return utf8chr(code_to_uni[encoding][c-128])
def utf8_to_code(encoding, str):
"""utf8_to_code(encoding, str) -> char,rest
Convert an UTF-8 string to encoding. Return the first char, and the
remaining UTF-8 bytes."""
if str == "":
return str
first = ord(str[0])
if first<128:
# Identity-map ASCII
return str[0],str[1:]
if uni_to_code[encoding] is None:
# see whether we have reverse direction
if code_to_uni[encoding] is None:
raise ConvertError("unknown encoding ISO-8859-%d" % encoding)
uni_to_code[encoding] = {}
for code in range(128):
uni = code_to_uni[encoding][code]
uni_to_code[encoding][uni] = code+128
if first<0xc0:
# 10xxxxxx
raise ConvertError("ill-formed UTF-8")
if first<0xe0:
# 110xxxxx 10xxxxxx
val = ((first & 0x1f)<<6) | (ord(str[1]) & 0x3f)
rest = str[2:]
elif first < 0xf0:
# 1110xxxx 10xxxxxx 10xxxxxx
val = ((first & 0xf)<<12) | ((ord(str[1]) & 0x3f)<<6) | (ord(str[2]) & 0x3f)
rest = str[3:]
else:
raise ConvertError("UTF-8 character outside BMP")
try:
return chr(uni_to_code[encoding][val]), rest
except KeyError:
raise ConvertError("Unicode character %x not supported in ISO-8859-%d"\
% (val, encoding))
############## GENERATED PART #########################
code_to_uni=[None,
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None,
None,
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None,
None,
None,
None,
]
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