JezK

Edit File: replace.py

"""Replace dialog for IDLE. Inherits SearchDialogBase for GUI. Uses idlelib.SearchEngine for search capability. Defines various replace related functions like replace, replace all, replace+find. """ import re from tkinter import StringVar, TclError from idlelib.searchbase import SearchDialogBase from idlelib import searchengine def replace(text): """Returns a singleton ReplaceDialog instance.The single dialog saves user entries and preferences across instances.""" root = text._root() engine = searchengine.get(root) if not hasattr(engine, "_replacedialog"): engine._replacedialog = ReplaceDialog(root, engine) dialog = engine._replacedialog dialog.open(text) class ReplaceDialog(SearchDialogBase): title = "Replace Dialog" icon = "Replace" def __init__(self, root, engine): SearchDialogBase.__init__(self, root, engine) self.replvar = StringVar(root) def open(self, text): """Display the replace dialog""" SearchDialogBase.open(self, text) try: first = text.index("sel.first") except TclError: first = None try: last = text.index("sel.last") except TclError: last = None first = first or text.index("insert") last = last or first self.show_hit(first, last) self.ok = 1 def create_entries(self): """Create label and text entry widgets""" SearchDialogBase.create_entries(self) self.replent = self.make_entry("Replace with:", self.replvar)[0] def create_command_buttons(self): SearchDialogBase.create_command_buttons(self) self.make_button("Find", self.find_it) self.make_button("Replace", self.replace_it) self.make_button("Replace+Find", self.default_command, 1) self.make_button("Replace All", self.replace_all) def find_it(self, event=None): self.do_find(0) def replace_it(self, event=None): if self.do_find(self.ok): self.do_replace() def default_command(self, event=None): "Replace and find next." if self.do_find(self.ok): if self.do_replace(): # Only find next match if replace succeeded. # A bad re can cause it to fail. self.do_find(0) def _replace_expand(self, m, repl): """ Helper function for expanding a regular expression in the replace field, if needed. """ if self.engine.isre(): try: new = m.expand(repl) except re.error: self.engine.report_error(repl, 'Invalid Replace Expression') new = None else: new = repl return new def replace_all(self, event=None): """Replace all instances of patvar with replvar in text""" prog = self.engine.getprog() if not prog: return repl = self.replvar.get() text = self.text res = self.engine.search_text(text, prog) if not res: self.bell() return text.tag_remove("sel", "1.0", "end") text.tag_remove("hit", "1.0", "end") line = res[0] col = res[1].start() if self.engine.iswrap(): line = 1 col = 0 ok = 1 first = last = None # XXX ought to replace circular instead of top-to-bottom when wrapping text.undo_block_start() while 1: res = self.engine.search_forward(text, prog, line, col, 0, ok) if not res: break line, m = res chars = text.get("%d.0" % line, "%d.0" % (line+1)) orig = m.group() new = self._replace_expand(m, repl) if new is None: break i, j = m.span() first = "%d.%d" % (line, i) last = "%d.%d" % (line, j) if new == orig: text.mark_set("insert", last) else: text.mark_set("insert", first) if first != last: text.delete(first, last) if new: text.insert(first, new) col = i + len(new) ok = 0 text.undo_block_stop() if first and last: self.show_hit(first, last) self.close() def do_find(self, ok=0): if not self.engine.getprog(): return False text = self.text res = self.engine.search_text(text, None, ok) if not res: self.bell() return False line, m = res i, j = m.span() first = "%d.%d" % (line, i) last = "%d.%d" % (line, j) self.show_hit(first, last) self.ok = 1 return True def do_replace(self): prog = self.engine.getprog() if not prog: return False text = self.text try: first = pos = text.index("sel.first") last = text.index("sel.last") except TclError: pos = None if not pos: first = last = pos = text.index("insert") line, col = searchengine.get_line_col(pos) chars = text.get("%d.0" % line, "%d.0" % (line+1)) m = prog.match(chars, col) if not prog: return False new = self._replace_expand(m, self.replvar.get()) if new is None: return False text.mark_set("insert", first) text.undo_block_start() if m.group(): text.delete(first, last) if new: text.insert(first, new) text.undo_block_stop() self.show_hit(first, text.index("insert")) self.ok = 0 return True def show_hit(self, first, last): """Highlight text from 'first' to 'last'. 'first', 'last' - Text indices""" text = self.text text.mark_set("insert", first) text.tag_remove("sel", "1.0", "end") text.tag_add("sel", first, last) text.tag_remove("hit", "1.0", "end") if first == last: text.tag_add("hit", first) else: text.tag_add("hit", first, last) text.see("insert") text.update_idletasks() def close(self, event=None): SearchDialogBase.close(self, event) self.text.tag_remove("hit", "1.0", "end") def _replace_dialog(parent): # htest # from tkinter import Toplevel, Text, END, SEL from tkinter.ttk import Button box = Toplevel(parent) box.title("Test ReplaceDialog") x, y = map(int, parent.geometry().split('+')[1:]) box.geometry("+%d+%d" % (x, y + 175)) # mock undo delegator methods def undo_block_start(): pass def undo_block_stop(): pass text = Text(box, inactiveselectbackground='gray') text.undo_block_start = undo_block_start text.undo_block_stop = undo_block_stop text.pack() text.insert("insert","This is a sample sTring\nPlus MORE.") text.focus_set() def show_replace(): text.tag_add(SEL, "1.0", END) replace(text) text.tag_remove(SEL, "1.0", END) button = Button(box, text="Replace", command=show_replace) button.pack() if __name__ == '__main__': from unittest import main main('idlelib.idle_test.test_replace', verbosity=2, exit=False) from idlelib.idle_test.htest import run run(_replace_dialog)