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'''Complete the current word before the cursor with words in the editor.

Each menu selection or shortcut key selection replaces the word with a
different word with the same prefix. The search for matches begins
before the target and moves toward the top of the editor. It then starts
after the cursor and moves down. It then returns to the original word and
the cycle starts again.

Changing the current text line or leaving the cursor in a different
place before requesting the next selection causes AutoExpand to reset
its state.

This is an extension file and there is only one instance of AutoExpand.
'''
import string
import re

###$ event <<expand-word>>
###$ win <Alt-slash>
###$ unix <Alt-slash>

class AutoExpand:

    menudefs = [
        ('edit', [
            ('E_xpand Word', '<<expand-word>>'),
         ]),
    ]

    wordchars = string.ascii_letters + string.digits + "_"

    def __init__(self, editwin):
        self.text = editwin.text
        self.state = None

    def expand_word_event(self, event):
        "Replace the current word with the next expansion."
        curinsert = self.text.index("insert")
        curline = self.text.get("insert linestart", "insert lineend")
        if not self.state:
            words = self.getwords()
            index = 0
        else:
            words, index, insert, line = self.state
            if insert != curinsert or line != curline:
                words = self.getwords()
                index = 0
        if not words:
            self.text.bell()
            return "break"
        word = self.getprevword()
        self.text.delete("insert - %d chars" % len(word), "insert")
        newword = words[index]
        index = (index + 1) % len(words)
        if index == 0:
            self.text.bell()            # Warn we cycled around
        self.text.insert("insert", newword)
        curinsert = self.text.index("insert")
        curline = self.text.get("insert linestart", "insert lineend")
        self.state = words, index, curinsert, curline
        return "break"

    def getwords(self):
        "Return a list of words that match the prefix before the cursor."
        word = self.getprevword()
        if not word:
            return []
        before = self.text.get("1.0", "insert wordstart")
        wbefore = re.findall(r"\b" + word + r"\w+\b", before)
        del before
        after = self.text.get("insert wordend", "end")
        wafter = re.findall(r"\b" + word + r"\w+\b", after)
        del after
        if not wbefore and not wafter:
            return []
        words = []
        dict = {}
        # search backwards through words before
        wbefore.reverse()
        for w in wbefore:
            if dict.get(w):
                continue
            words.append(w)
            dict[w] = w
        # search onwards through words after
        for w in wafter:
            if dict.get(w):
                continue
            words.append(w)
            dict[w] = w
        words.append(word)
        return words

    def getprevword(self):
        "Return the word prefix before the cursor."
        line = self.text.get("insert linestart", "insert")
        i = len(line)
        while i > 0 and line[i-1] in self.wordchars:
            i = i-1
        return line[i:]

if __name__ == '__main__':
    import unittest
    unittest.main('idlelib.idle_test.test_autoexpand', verbosity=2)

Filemanager

Name Type Size Permission Actions
Icons Folder 0755
__pycache__ Folder 0755
idle_test Folder 0755
AutoComplete.py File 8.99 KB 0644
AutoCompleteWindow.py File 17.32 KB 0644
AutoExpand.py File 3.32 KB 0644
Bindings.py File 2.97 KB 0644
CREDITS.txt File 1.82 KB 0644
CallTipWindow.py File 5.89 KB 0644
CallTips.py File 5.79 KB 0644
ChangeLog File 55.07 KB 0644
ClassBrowser.py File 6.83 KB 0644
CodeContext.py File 8.15 KB 0644
ColorDelegator.py File 9.47 KB 0644
Debugger.py File 18.32 KB 0644
Delegator.py File 665 B 0644
EditorWindow.py File 64.51 KB 0644
FileList.py File 3.72 KB 0644
FormatParagraph.py File 7.12 KB 0644
GrepDialog.py File 5 KB 0644
HISTORY.txt File 10.08 KB 0644
HyperParser.py File 12.58 KB 0644
IOBinding.py File 19.31 KB 0644
IdleHistory.py File 3.96 KB 0644
MultiCall.py File 18.14 KB 0644
MultiStatusBar.py File 1.32 KB 0644
NEWS.txt File 38.9 KB 0644
ObjectBrowser.py File 3.88 KB 0644
OutputWindow.py File 4.29 KB 0644
ParenMatch.py File 6.56 KB 0644
PathBrowser.py File 3.13 KB 0644
Percolator.py File 3.17 KB 0644
PyParse.py File 19.98 KB 0644
PyShell.py File 57.08 KB 0755
README.txt File 7.53 KB 0644
RemoteDebugger.py File 11.73 KB 0644
RemoteObjectBrowser.py File 964 B 0644
ReplaceDialog.py File 6.48 KB 0644
RstripExtension.py File 1.03 KB 0644
ScriptBinding.py File 7.87 KB 0644
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TODO.txt File 8.28 KB 0644
ToolTip.py File 3.1 KB 0644
TreeWidget.py File 14.67 KB 0644
UndoDelegator.py File 10.56 KB 0644
WidgetRedirector.py File 6.71 KB 0644
WindowList.py File 2.41 KB 0644
ZoomHeight.py File 1.27 KB 0644
__init__.py File 288 B 0644
__main__.py File 159 B 0644
aboutDialog.py File 6.53 KB 0644
config-extensions.def File 2.9 KB 0644
config-highlight.def File 2.46 KB 0644
config-keys.def File 7.59 KB 0644
config-main.def File 2.5 KB 0644
configDialog.py File 62.8 KB 0644
configHandler.py File 31.44 KB 0644
configHelpSourceEdit.py File 6.51 KB 0644
configSectionNameDialog.py File 3.91 KB 0644
dynOptionMenuWidget.py File 1.94 KB 0644
extend.txt File 3.56 KB 0644
help.html File 40.16 KB 0644
help.py File 9.47 KB 0644
help.txt File 17.48 KB 0644
idle.py File 400 B 0644
idle.pyw File 570 B 0644
idlever.py File 415 B 0644
keybindingDialog.py File 12.13 KB 0644
macosxSupport.py File 8.48 KB 0644
rpc.py File 20.29 KB 0644
run.py File 13.35 KB 0644
tabbedpages.py File 17.99 KB 0644
textView.py File 3.15 KB 0644