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import string
import re
from Tkinter import *
import tkMessageBox
def get(root):
if not hasattr(root, "_searchengine"):
root._searchengine = SearchEngine(root)
# XXX This will never garbage-collect -- who cares
return root._searchengine
class SearchEngine:
def __init__(self, root):
self.root = root
# State shared by search, replace, and grep;
# the search dialogs bind these to UI elements.
self.patvar = StringVar(root) # search pattern
self.revar = BooleanVar(root) # regular expression?
self.casevar = BooleanVar(root) # match case?
self.wordvar = BooleanVar(root) # match whole word?
self.wrapvar = BooleanVar(root) # wrap around buffer?
self.wrapvar.set(1) # (on by default)
self.backvar = BooleanVar(root) # search backwards?
# Access methods
def getpat(self):
return self.patvar.get()
def setpat(self, pat):
self.patvar.set(pat)
def isre(self):
return self.revar.get()
def iscase(self):
return self.casevar.get()
def isword(self):
return self.wordvar.get()
def iswrap(self):
return self.wrapvar.get()
def isback(self):
return self.backvar.get()
# Higher level access methods
def getcookedpat(self):
pat = self.getpat()
if not self.isre():
pat = re.escape(pat)
if self.isword():
pat = r"\b%s\b" % pat
return pat
def getprog(self):
pat = self.getpat()
if not pat:
self.report_error(pat, "Empty regular expression")
return None
pat = self.getcookedpat()
flags = 0
if not self.iscase():
flags = flags | re.IGNORECASE
try:
prog = re.compile(pat, flags)
except re.error, what:
try:
msg, col = what
except:
msg = str(what)
col = -1
self.report_error(pat, msg, col)
return None
return prog
def report_error(self, pat, msg, col=-1):
# Derived class could overrid this with something fancier
msg = "Error: " + str(msg)
if pat:
msg = msg + "\np\Pattern: " + str(pat)
if col >= 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.
XXX When wrapping around and failing to find anything, the
portion of the text after the selection is searched twice :-(
"""
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):
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
col = 0
ok = 1
chars = text.get("%d.0" % line, "%d.0" % (line+1))
if not chars and wrap:
wrap = 0
line = 1
chars = text.get("1.0", "2.0")
return None
def search_backward(self, text, prog, line, col, wrap, ok=0):
chars = text.get("%d.0" % line, "%d.0" % (line+1))
while 1:
m = search_reverse(prog, chars[:-1], col)
if m:
i, j = m.span()
if ok or m.start() < col:
return line, m
line = line - 1
ok = 1
if line <= 0:
if not wrap:
break
wrap = 0
pos = text.index("end-1c")
line, col = map(int, string.split(pos, "."))
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, string.split(index, ".")) # Fails on invalid index
return line, col
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