/usr/lib/python3.5/idlelib/SearchEngine.py is in libpython3.5-stdlib 3.5.1-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 | '''Define SearchEngine for search dialogs.'''
import re
from tkinter import StringVar, BooleanVar, TclError
import tkinter.messagebox as tkMessageBox
def get(root):
'''Return the singleton SearchEngine instance for the process.
The single SearchEngine saves settings between dialog instances.
If there is not a SearchEngine already, make one.
'''
if not hasattr(root, "_searchengine"):
root._searchengine = SearchEngine(root)
# This creates a cycle that persists until root is deleted.
return root._searchengine
class SearchEngine:
"""Handles searching a text widget for Find, Replace, and Grep."""
def __init__(self, root):
'''Initialize Variables that save search state.
The dialogs bind these to the UI elements present in the dialogs.
'''
self.root = root # need for report_error()
self.patvar = StringVar(root, '') # search pattern
self.revar = BooleanVar(root, False) # regular expression?
self.casevar = BooleanVar(root, False) # match case?
self.wordvar = BooleanVar(root, False) # match whole word?
self.wrapvar = BooleanVar(root, True) # wrap around buffer?
self.backvar = BooleanVar(root, False) # 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 setcookedpat(self, pat):
"Set pattern after escaping if re."
# called only in SearchDialog.py: 66
if self.isre():
pat = re.escape(pat)
self.setpat(pat)
def getcookedpat(self):
pat = self.getpat()
if not self.isre(): # if True, see setcookedpat
pat = re.escape(pat)
if self.isword():
pat = r"\b%s\b" % pat
return pat
def getprog(self):
"Return compiled cooked search pattern."
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 as what:
args = what.args
msg = args[0]
col = args[1] if len(args) >= 2 else -1
self.report_error(pat, msg, col)
return None
return prog
def report_error(self, pat, msg, col=-1):
# Derived class could override this with something fancier
msg = "Error: " + str(msg)
if pat:
msg = msg + "\nPattern: " + str(pat)
if col >= 0:
msg = msg + "\nOffset: " + str(col)
tkMessageBox.showerror("Regular expression error",
msg, master=self.root)
def search_text(self, text, prog=None, ok=0):
'''Return (lineno, matchobj) or None for forward/backward search.
This function calls the right function with the right arguments.
It directly return the result of that call.
Text is a text widget. Prog is a precompiled pattern.
The ok parameter is a bit complicated as it has two effects.
If there is a selection, the search begin at either end,
depending on the direction setting and ok, with ok meaning that
the search starts with the selection. Otherwise, search begins
at the insert mark.
To aid progress, the search functions do not return an empty
match at the starting position unless ok is True.
'''
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
def search_reverse(prog, chars, col):
'''Search backwards and return an re match object or None.
This is done by searching forwards until there is no match.
Prog: compiled re object with a search method returning a match.
Chars: line of text, without \\n.
Col: stop index for the search; the limit for match.end().
'''
m = prog.search(chars)
if not m:
return None
found = None
i, j = m.span() # m.start(), m.end() == match slice indexes
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
def get_selection(text):
'''Return tuple of 'line.col' indexes from selection or insert mark.
'''
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
def get_line_col(index):
'''Return (line, col) tuple of ints from 'line.col' string.'''
line, col = map(int, index.split(".")) # Fails on invalid index
return line, col
if __name__ == "__main__":
import unittest
unittest.main('idlelib.idle_test.test_searchengine', verbosity=2, exit=False)
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