def _decode(self, index, endflag=0):
if isinstance(index, (float, bytes)):
index = str(index)
try:
index = index.lower()
except AttributeError:
raise TclError('bad text index "%s"' % index)
lastline = len(self.data) - 1
if index == 'insert':
return (lastline, len(self.data[lastline]) - 1)
if index == 'end':
return self._endex(endflag)
line, char = index.split('.')
line = int(line)
if line < 1:
return (1, 0)
if line > lastline:
return self._endex(endflag)
linelength = len(self.data[line]) - 1
if char.endswith(' lineend') or char == 'end':
return (line, linelength)
char = int(char)
if char < 0:
char = 0
elif char > linelength:
char = linelength
return (line, char)
def _decode(self, index, endflag=0):
"""Return a (line, char) tuple of int indexes into self.data.
This implements .index without converting the result back to a string.
The result is contrained by the number of lines and linelengths of
self.data. For many indexes, the result is initially (1, 0).
The input index may have any of several possible forms:
* line.char float: converted to 'line.char' string;
* 'line.char' string, where line and char are decimal integers;
* 'line.char lineend', where lineend='lineend' (and char is ignored);
* 'line.end', where end='end' (same as above);
* 'insert', the positions before terminal \n;
* 'end', whose meaning depends on the endflag passed to ._endex.
* 'sel.first' or 'sel.last', where sel is a tag -- not implemented.
"""
if isinstance(index, (float, bytes)):
index = str(index)
try:
index = index.lower()
except AttributeError:
raise TclError('bad text index "%s"' % index) from None
lastline = len(self.data) - 1 # same as number of text lines
if index == 'insert':
return lastline, len(self.data[lastline]) - 1
elif index == 'end':
return self._endex(endflag)
line, char = index.split('.')
line = int(line)
# Out of bounds line becomes first or last ('end') index
if line < 1:
return 1, 0
elif line > lastline:
return self._endex(endflag)
linelength = len(self.data[line]) - 1 # position before/at \n
if char.endswith(' lineend') or char == 'end':
return line, linelength
# Tk requires that ignored chars before ' lineend' be valid int
# Out of bounds char becomes first or last index of line
char = int(char)
if char < 0:
char = 0
elif char > linelength:
char = linelength
return line, char
def compare(self, index1, op, index2):
line1, char1 = self._decode(index1)
line2, char2 = self._decode(index2)
if op == '<':
return line1 < line2 or line1 == line2 and char1 < char2
if op == '<=':
return line1 < line2 or line1 == line2 and char1 <= char2
if op == '>':
return line1 > line2 or line1 == line2 and char1 > char2
if op == '>=':
return line1 > line2 or line1 == line2 and char1 >= char2
if op == '==':
return line1 == line2 and char1 == char2
if op == '!=':
return line1 != line2 or char1 != char2
raise TclError('bad comparison operator "%s":must be <, <=, ==, >=, >, or !=' % op)