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If *renew* is set to True, the line and column counting will always begin
from the start of the file. Keep in mind that this could can be very slow
because it has to go through each and every character until the desired
position is reached.
Otherwise, if *renew* is set to False, it will be decided if counting from
the start is shorter than counting from the current cursor position.
""""""
mapping = {os.SEEK_SET: 'set', os.SEEK_CUR: 'cur', os.SEEK_END: 'end'}
mode = mapping.get(mode, mode)
if mode not in ('set', 'cur', 'end'):
raise ValueError('invalid mode: ""{}""'.format(mode))
# Translate the other modes into the 'set' mode.
if mode == 'end':
offset = len(self.text) + offset
mode = 'set'
elif mode == 'cur':
offset = self.index + offset
mode = 'set'
assert mode == 'set'
if offset < 0:
offset = 0
elif offset > len(self.text):
offset = len(self.text) + 1
if self.index == offset:
return
# Figure which path is shorter:
# 1) Start counting from the beginning of the file,
if offset <= abs(self.index - offset):
text, index, lineno, colno = self.text, 0, 1, 0
while index != offset:
# Find the next newline in the string.
nli = text.find('\n', index)
if nli >= offset or nli < 0:
colno = offset - index
index = offset
break
else:
colno = 0
lineno += 1
index = nli + 1
# 2) or step from the current position of the cursor.
else:
text, index, lineno, colno = self.text, self.index, self.lineno, self.colno
if offset < index: # backwards
while index != offset:
nli = text.rfind('\n', 0, index)
if nli < 0 or nli <= offset:
if text[offset] == '\n':
assert (offset - nli) == 0, (offset, nli)
nli = text.rfind('\n', 0, index-1)
lineno -= 1
colno = offset - nli - 1
index = offset
break
else:
lineno -= 1
index = nli - 1
else: # forwards
while index != offset:
nli = text.find('\n', index)
if nli < 0 or nli >= offset:
colno = offset - index
index = offset
else:
lineno += 1
index = nli + 1
assert lineno >= 1
assert colno >= 0
assert index == offset
self.index, self.lineno, self.colno = index, lineno, colno"
892,"def next(self):
"" Move on to the next character in the text. ""
char = self.char
if char == '\n':
self.lineno += 1
self.colno = 0
else:
self.colno += 1
self.index += 1
return self.char"
893,"def readline(self):
"" Reads a full line from the scanner and returns it. ""
start = end = self.index
while end < len(self.text):
if self.text[end] == '\n':
end += 1
break
end += 1