def get_encoding_mode(): """ Get the mode Urwid is using when processing text strings. Returns 'narrow' for 8-bit encodings, 'wide' for CJK encodings or 'utf8' for UTF-8 encodings. """ return str_util.get_byte_encoding()
def process_keyqueue(codes, more_available):
"""
codes -- list of key codes
more_available -- if True then raise MoreInputRequired when in the
middle of a character sequence (escape/utf8/wide) and caller
will attempt to send more key codes on the next call.
returns (list of input, list of remaining key codes).
"""
code = codes[0]
if code >= 32 and code <= 126:
key = chr(code)
return [key], codes[1:]
if _keyconv.has_key(code):
return [_keyconv[code]], codes[1:]
if code >0 and code <27:
return ["ctrl %s" % chr(ord('a')+code-1)], codes[1:]
if code >27 and code <32:
return ["ctrl %s" % chr(ord('A')+code-1)], codes[1:]
em = str_util.get_byte_encoding()
if (em == 'wide' and code < 256 and
within_double_byte(chr(code),0,0)):
if not codes[1:]:
if more_available:
raise MoreInputRequired()
if codes[1:] and codes[1] < 256:
db = chr(code)+chr(codes[1])
if within_double_byte(db, 0, 1):
return [db], codes[2:]
if em == 'utf8' and code>127 and code<256:
if code & 0xe0 == 0xc0: # 2-byte form
need_more = 1
elif code & 0xf0 == 0xe0: # 3-byte form
need_more = 2
elif code & 0xf8 == 0xf0: # 4-byte form
need_more = 3
else:
return ["<%d>"%code], codes[1:]
for i in range(need_more):
if len(codes)-1 <= i:
if more_available:
raise MoreInputRequired()
else:
return ["<%d>"%code], codes[1:]
k = codes[i+1]
if k>256 or k&0xc0 != 0x80:
return ["<%d>"%code], codes[1:]
s = "".join([chr(c)for c in codes[:need_more+1]])
try:
return [s.decode("utf-8")], codes[need_more+1:]
except UnicodeDecodeError:
return ["<%d>"%code], codes[1:]
if code >127 and code <256:
key = chr(code)
return [key], codes[1:]
if code != 27:
return ["<%d>"%code], codes[1:]
result = input_trie.get(codes[1:], more_available)
if result is not None:
result, remaining_codes = result
return [result], remaining_codes
if codes[1:]:
# Meta keys -- ESC+Key form
run, remaining_codes = process_keyqueue(codes[1:],
more_available)
if run[0] == "esc" or run[0].find("meta ") >= 0:
return ['esc']+run, remaining_codes
return ['meta '+run[0]]+run[1:], remaining_codes
return ['esc'], codes[1:]
