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308 lines
9.8 KiB
308 lines
9.8 KiB
"""Replace dialog for IDLE. Inherits SearchDialogBase for GUI.
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Uses idlelib.searchengine.SearchEngine for search capability.
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Defines various replace related functions like replace, replace all,
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and replace+find.
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"""
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import re
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from tkinter import StringVar, TclError
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from idlelib.searchbase import SearchDialogBase
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from idlelib import searchengine
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def replace(text, insert_tags=None):
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"""Create or reuse a singleton ReplaceDialog instance.
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The singleton dialog saves user entries and preferences
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across instances.
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Args:
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text: Text widget containing the text to be searched.
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"""
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root = text._root()
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engine = searchengine.get(root)
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if not hasattr(engine, "_replacedialog"):
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engine._replacedialog = ReplaceDialog(root, engine)
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dialog = engine._replacedialog
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dialog.open(text, insert_tags=insert_tags)
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class ReplaceDialog(SearchDialogBase):
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"Dialog for finding and replacing a pattern in text."
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title = "Replace Dialog"
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icon = "Replace"
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def __init__(self, root, engine):
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"""Create search dialog for finding and replacing text.
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Uses SearchDialogBase as the basis for the GUI and a
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searchengine instance to prepare the search.
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Attributes:
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replvar: StringVar containing 'Replace with:' value.
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replent: Entry widget for replvar. Created in
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create_entries().
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ok: Boolean used in searchengine.search_text to indicate
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whether the search includes the selection.
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"""
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super().__init__(root, engine)
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self.replvar = StringVar(root)
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self.insert_tags = None
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def open(self, text, insert_tags=None):
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"""Make dialog visible on top of others and ready to use.
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Also, highlight the currently selected text and set the
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search to include the current selection (self.ok).
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Args:
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text: Text widget being searched.
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"""
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SearchDialogBase.open(self, text)
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try:
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first = text.index("sel.first")
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except TclError:
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first = None
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try:
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last = text.index("sel.last")
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except TclError:
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last = None
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first = first or text.index("insert")
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last = last or first
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self.show_hit(first, last)
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self.ok = True
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self.insert_tags = insert_tags
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def create_entries(self):
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"Create base and additional label and text entry widgets."
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SearchDialogBase.create_entries(self)
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self.replent = self.make_entry("Replace with:", self.replvar)[0]
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def create_command_buttons(self):
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"""Create base and additional command buttons.
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The additional buttons are for Find, Replace,
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Replace+Find, and Replace All.
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"""
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SearchDialogBase.create_command_buttons(self)
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self.make_button("Find", self.find_it)
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self.make_button("Replace", self.replace_it)
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self.make_button("Replace+Find", self.default_command, isdef=True)
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self.make_button("Replace All", self.replace_all)
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def find_it(self, event=None):
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"Handle the Find button."
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self.do_find(False)
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def replace_it(self, event=None):
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"""Handle the Replace button.
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If the find is successful, then perform replace.
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"""
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if self.do_find(self.ok):
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self.do_replace()
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def default_command(self, event=None):
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"""Handle the Replace+Find button as the default command.
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First performs a replace and then, if the replace was
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successful, a find next.
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"""
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if self.do_find(self.ok):
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if self.do_replace(): # Only find next match if replace succeeded.
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# A bad re can cause it to fail.
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self.do_find(False)
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def _replace_expand(self, m, repl):
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"Expand replacement text if regular expression."
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if self.engine.isre():
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try:
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new = m.expand(repl)
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except re.error:
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self.engine.report_error(repl, 'Invalid Replace Expression')
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new = None
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else:
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new = repl
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return new
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def replace_all(self, event=None):
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"""Handle the Replace All button.
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Search text for occurrences of the Find value and replace
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each of them. The 'wrap around' value controls the start
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point for searching. If wrap isn't set, then the searching
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starts at the first occurrence after the current selection;
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if wrap is set, the replacement starts at the first line.
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The replacement is always done top-to-bottom in the text.
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"""
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prog = self.engine.getprog()
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if not prog:
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return
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repl = self.replvar.get()
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text = self.text
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res = self.engine.search_text(text, prog)
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if not res:
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self.bell()
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return
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text.tag_remove("sel", "1.0", "end")
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text.tag_remove("hit", "1.0", "end")
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line = res[0]
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col = res[1].start()
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if self.engine.iswrap():
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line = 1
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col = 0
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ok = True
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first = last = None
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# XXX ought to replace circular instead of top-to-bottom when wrapping
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text.undo_block_start()
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while res := self.engine.search_forward(
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text, prog, line, col, wrap=False, ok=ok):
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line, m = res
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chars = text.get("%d.0" % line, "%d.0" % (line+1))
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orig = m.group()
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new = self._replace_expand(m, repl)
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if new is None:
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break
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i, j = m.span()
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first = "%d.%d" % (line, i)
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last = "%d.%d" % (line, j)
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if new == orig:
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text.mark_set("insert", last)
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else:
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text.mark_set("insert", first)
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if first != last:
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text.delete(first, last)
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if new:
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text.insert(first, new, self.insert_tags)
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col = i + len(new)
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ok = False
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text.undo_block_stop()
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if first and last:
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self.show_hit(first, last)
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self.close()
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def do_find(self, ok=False):
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"""Search for and highlight next occurrence of pattern in text.
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No text replacement is done with this option.
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"""
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if not self.engine.getprog():
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return False
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text = self.text
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res = self.engine.search_text(text, None, ok)
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if not res:
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self.bell()
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return False
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line, m = res
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i, j = m.span()
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first = "%d.%d" % (line, i)
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last = "%d.%d" % (line, j)
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self.show_hit(first, last)
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self.ok = True
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return True
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def do_replace(self):
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"Replace search pattern in text with replacement value."
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prog = self.engine.getprog()
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if not prog:
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return False
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text = self.text
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try:
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first = pos = text.index("sel.first")
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last = text.index("sel.last")
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except TclError:
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pos = None
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if not pos:
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first = last = pos = text.index("insert")
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line, col = searchengine.get_line_col(pos)
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chars = text.get("%d.0" % line, "%d.0" % (line+1))
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m = prog.match(chars, col)
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if not prog:
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return False
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new = self._replace_expand(m, self.replvar.get())
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if new is None:
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return False
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text.mark_set("insert", first)
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text.undo_block_start()
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if m.group():
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text.delete(first, last)
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if new:
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text.insert(first, new, self.insert_tags)
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text.undo_block_stop()
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self.show_hit(first, text.index("insert"))
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self.ok = False
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return True
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def show_hit(self, first, last):
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"""Highlight text between first and last indices.
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Text is highlighted via the 'hit' tag and the marked
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section is brought into view.
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The colors from the 'hit' tag aren't currently shown
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when the text is displayed. This is due to the 'sel'
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tag being added first, so the colors in the 'sel'
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config are seen instead of the colors for 'hit'.
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"""
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text = self.text
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text.mark_set("insert", first)
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text.tag_remove("sel", "1.0", "end")
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text.tag_add("sel", first, last)
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text.tag_remove("hit", "1.0", "end")
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if first == last:
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text.tag_add("hit", first)
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else:
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text.tag_add("hit", first, last)
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text.see("insert")
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text.update_idletasks()
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def close(self, event=None):
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"Close the dialog and remove hit tags."
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SearchDialogBase.close(self, event)
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self.text.tag_remove("hit", "1.0", "end")
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self.insert_tags = None
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def _replace_dialog(parent): # htest #
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from tkinter import Toplevel, Text, END, SEL
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from tkinter.ttk import Frame, Button
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top = Toplevel(parent)
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top.title("Test ReplaceDialog")
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x, y = map(int, parent.geometry().split('+')[1:])
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top.geometry("+%d+%d" % (x, y + 175))
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# mock undo delegator methods
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def undo_block_start():
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pass
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def undo_block_stop():
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pass
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frame = Frame(top)
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frame.pack()
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text = Text(frame, inactiveselectbackground='gray')
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text.undo_block_start = undo_block_start
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text.undo_block_stop = undo_block_stop
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text.pack()
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text.insert("insert","This is a sample sTring\nPlus MORE.")
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text.focus_set()
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def show_replace():
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text.tag_add(SEL, "1.0", END)
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replace(text)
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text.tag_remove(SEL, "1.0", END)
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button = Button(frame, text="Replace", command=show_replace)
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button.pack()
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if __name__ == '__main__':
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from unittest import main
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main('idlelib.idle_test.test_replace', verbosity=2, exit=False)
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from idlelib.idle_test.htest import run
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run(_replace_dialog)
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