mirror of
https://github.com/python/cpython.git
synced 2024-12-14 04:17:19 +08:00
222 lines
6.6 KiB
Python
222 lines
6.6 KiB
Python
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.
|
|
|
|
"""
|
|
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, 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
|