= 0:
msg = msg + "\nOffset: " + str(col)
tkMessageBox.showerror("Regular expression error",
msg, master=self.root)
def setcookedpat(self, pat):
if self.isre():
pat = re.escape(pat)
self.setpat(pat)
def search_text(self, text, prog=None, ok=0):
"""Search a text widget for the pattern.
If prog is given, it should be the precompiled pattern.
Return a tuple (lineno, matchobj); None if not found.
This obeys the wrap and direction (back) settings.
The search starts at the selection (if there is one) or
at the insert mark (otherwise). If the search is forward,
it starts at the right of the selection; for a backward
search, it starts at the left end. An empty match exactly
at either end of the selection (or at the insert mark if
there is no selection) is ignored unless the ok flag is true
-- this is done to guarantee progress.
If the search is allowed to wrap around, it will return the
original selection if (and only if) it is the only match.
"""
if not prog:
prog = self.getprog()
if not prog:
return None # Compilation failed -- stop
wrap = self.wrapvar.get()
first, last = get_selection(text)
if self.isback():
if ok:
start = last
else:
start = first
line, col = get_line_col(start)
res = self.search_backward(text, prog, line, col, wrap, ok)
else:
if ok:
start = first
else:
start = last
line, col = get_line_col(start)
res = self.search_forward(text, prog, line, col, wrap, ok)
return res
def search_forward(self, text, prog, line, col, wrap, ok=0):
wrapped = 0
startline = line
chars = text.get("%d.0" % line, "%d.0" % (line+1))
while chars:
m = prog.search(chars[:-1], col)
if m:
if ok or m.end() > col:
return line, m
line = line + 1
if wrapped and line > startline:
break
col = 0
ok = 1
chars = text.get("%d.0" % line, "%d.0" % (line+1))
if not chars and wrap:
wrapped = 1
wrap = 0
line = 1
chars = text.get("1.0", "2.0")
return None
def search_backward(self, text, prog, line, col, wrap, ok=0):
wrapped = 0
startline = line
chars = text.get("%d.0" % line, "%d.0" % (line+1))
while 1:
m = search_reverse(prog, chars[:-1], col)
if m:
if ok or m.start() < col:
return line, m
line = line - 1
if wrapped and line < startline:
break
ok = 1
if line <= 0:
if not wrap:
break
wrapped = 1
wrap = 0
pos = text.index("end-1c")
line, col = map(int, pos.split("."))
chars = text.get("%d.0" % line, "%d.0" % (line+1))
col = len(chars) - 1
return None
# Helper to search backwards in a string.
# (Optimized for the case where the pattern isn't found.)
def search_reverse(prog, chars, col):
m = prog.search(chars)
if not m:
return None
found = None
i, j = m.span()
while i < col and j <= col:
found = m
if i == j:
j = j+1
m = prog.search(chars, j)
if not m:
break
i, j = m.span()
return found
# Helper to get selection end points, defaulting to insert mark.
# Return a tuple of indices ("line.col" strings).
def get_selection(text):
try:
first = text.index("sel.first")
last = text.index("sel.last")
except TclError:
first = last = None
if not first:
first = text.index("insert")
if not last:
last = first
return first, last
# Helper to parse a text index into a (line, col) tuple.
def get_line_col(index):
line, col = map(int, index.split(".")) # Fails on invalid index
return line, col