1 | n/a | from idlelib.WidgetRedirector import WidgetRedirector |
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2 | n/a | from idlelib.Delegator import Delegator |
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3 | n/a | |
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4 | n/a | class Percolator: |
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5 | n/a | |
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6 | n/a | def __init__(self, text): |
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7 | n/a | # XXX would be nice to inherit from Delegator |
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8 | n/a | self.text = text |
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9 | n/a | self.redir = WidgetRedirector(text) |
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10 | n/a | self.top = self.bottom = Delegator(text) |
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11 | n/a | self.bottom.insert = self.redir.register("insert", self.insert) |
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12 | n/a | self.bottom.delete = self.redir.register("delete", self.delete) |
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13 | n/a | self.filters = [] |
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14 | n/a | |
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15 | n/a | def close(self): |
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16 | n/a | while self.top is not self.bottom: |
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17 | n/a | self.removefilter(self.top) |
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18 | n/a | self.top = None |
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19 | n/a | self.bottom.setdelegate(None); self.bottom = None |
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20 | n/a | self.redir.close(); self.redir = None |
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21 | n/a | self.text = None |
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22 | n/a | |
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23 | n/a | def insert(self, index, chars, tags=None): |
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24 | n/a | # Could go away if inheriting from Delegator |
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25 | n/a | self.top.insert(index, chars, tags) |
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26 | n/a | |
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27 | n/a | def delete(self, index1, index2=None): |
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28 | n/a | # Could go away if inheriting from Delegator |
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29 | n/a | self.top.delete(index1, index2) |
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30 | n/a | |
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31 | n/a | def insertfilter(self, filter): |
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32 | n/a | # Perhaps rename to pushfilter()? |
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33 | n/a | assert isinstance(filter, Delegator) |
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34 | n/a | assert filter.delegate is None |
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35 | n/a | filter.setdelegate(self.top) |
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36 | n/a | self.top = filter |
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37 | n/a | |
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38 | n/a | def removefilter(self, filter): |
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39 | n/a | # XXX Perhaps should only support popfilter()? |
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40 | n/a | assert isinstance(filter, Delegator) |
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41 | n/a | assert filter.delegate is not None |
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42 | n/a | f = self.top |
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43 | n/a | if f is filter: |
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44 | n/a | self.top = filter.delegate |
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45 | n/a | filter.setdelegate(None) |
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46 | n/a | else: |
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47 | n/a | while f.delegate is not filter: |
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48 | n/a | assert f is not self.bottom |
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49 | n/a | f.resetcache() |
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50 | n/a | f = f.delegate |
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51 | n/a | f.setdelegate(filter.delegate) |
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52 | n/a | filter.setdelegate(None) |
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53 | n/a | |
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54 | n/a | def main(): |
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55 | n/a | import tkinter as Tk |
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56 | n/a | class Tracer(Delegator): |
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57 | n/a | def __init__(self, name): |
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58 | n/a | self.name = name |
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59 | n/a | Delegator.__init__(self, None) |
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60 | n/a | def insert(self, *args): |
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61 | n/a | print(self.name, ": insert", args) |
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62 | n/a | self.delegate.insert(*args) |
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63 | n/a | def delete(self, *args): |
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64 | n/a | print(self.name, ": delete", args) |
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65 | n/a | self.delegate.delete(*args) |
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66 | n/a | root = Tk.Tk() |
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67 | n/a | root.wm_protocol("WM_DELETE_WINDOW", root.quit) |
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68 | n/a | text = Tk.Text() |
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69 | n/a | text.pack() |
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70 | n/a | text.focus_set() |
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71 | n/a | p = Percolator(text) |
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72 | n/a | t1 = Tracer("t1") |
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73 | n/a | t2 = Tracer("t2") |
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74 | n/a | p.insertfilter(t1) |
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75 | n/a | p.insertfilter(t2) |
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76 | n/a | root.mainloop() # click close widget to continue... |
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77 | n/a | p.removefilter(t2) |
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78 | n/a | root.mainloop() |
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79 | n/a | p.insertfilter(t2) |
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80 | n/a | p.removefilter(t1) |
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81 | n/a | root.mainloop() |
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82 | n/a | |
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83 | n/a | if __name__ == "__main__": |
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84 | n/a | main() |
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