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annotate orpg/tools/predTextCtrl.py @ 0:4385a7d0efd1 grumpy-goblin

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Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
author sirebral
date Tue, 14 Jul 2009 16:41:58 -0500
parents
children 5aff3ef1ae46
rev   line source
0
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1 # Copyright (C) 2001 The OpenRPG Project
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2 #
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3 # openrpg-dev@lists.sourceforge.net
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4 #
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5 # This program is free software; you can redistribute it and/or modify
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6 # it under the terms of the GNU General Public License as published by
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7 # the Free Software Foundation; either version 2 of the License, or
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8 # (at your option) any later version.
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9 #
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10 # This program is distributed in the hope that it will be useful,
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11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 # GNU General Public License for more details.
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14 #
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15 # You should have received a copy of the GNU General Public License
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16 # along with this program; if not, write to the Free Software
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17 # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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18 # --
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19 #
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20 # File: predTextCtrl.py
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21 # Author: Andrew Bennett
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22 # Maintainer: Andrew Bennett
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23 # Version: $id:$
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24 #
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25 # Description: This file contains an extension to the wxPython wx.TextCtrl that provides predictive word completion
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26 # based on a word file loaded at instantiation. Also, it learns new words as you type, dynamically
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27 # adjusting a weight for each word based on how often you type it.
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28 #
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29
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30 ##
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31 ## Module Loading
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32 ##
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33
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34 import string
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35 from orpg.orpg_windows import *
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36
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37 # This line added to test CVS commit
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38
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39 ##
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40 ## Class Definitions
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41 ##
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42
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43 # This class implements a tree node that represents a letter
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44 #
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45 # Defines:
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46 # __init__(self,filename)
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47 #
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48 class Letter:
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49 def __init__(self,asciiCharIn,parentNodeIn):
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50 self.asciiChar = asciiCharIn # should be an ASCII char
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51 self.parentNode = parentNodeIn # should be ref to a class Letter
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52 self.priority = 0 # should be an int
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53 self.mostCommon = self # should be a ref to a class Letter
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54 self.children = {} # should be a ref to a dictionary of class Letter
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55
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56 def __str__(self):
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57 return self.asciiChar
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58
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59
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60 # This class implements the tree structure to hold the words
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61 #
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62 # Defines:
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63 # __init__(self,filename)
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64 # updateMostCommon(self,target)
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65 # setWord(self,wordText,priority,sumFlag)
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66 # addWord(self,wordText)
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67 # setWord(self,wordText)
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68 # setWordPriority(self,wordText,priority)
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69 # findWordNode(self,wordText) returns class Letter
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70 # findWordPriority(self,wordText) returns int
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71 # getPredition(self,k,cur) returns string
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72 class LetterTreeClass(object):
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73
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74 # Initialization subroutine.
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75 #
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76 # self : instance of self
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77 # filename : name of word file to use
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78 #
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79 # returns None
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80 #
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81 # Purpose: Constructor for LetterTree. Basically, it initializes itself with a word file, if present.
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82 def __init__(self, singletonKey):
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83 if not isinstance(singletonKey, _SingletonKey):
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84 raise invalid_argument(_("Use LetterTree() to get access to singleton"))
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85
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86 self.rootNode = Letter("",None) # rootNode is a class Letter
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87 self.rootNode.children = {} # initialize the children list
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88
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89
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90 # updateMostCommon subroutine.
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91 #
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92 # self : instance of self
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93 # target : class Letter that was updated
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94 #
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95 # Returns None
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96 #
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97 # Purpose: Updates all of the parent nodes of the target, such that their mostCommon member
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98 # points to the proper class Letter, based on the newly updated priorities.
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99 def updateMostCommon(self, target):
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100 # cur is a class Letter
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101 prev = target.parentNode # prev is a class Letter
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102 while prev:
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103 if prev.mostCommon is None:
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104 prev.mostCommon = target
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105 else:
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106 if target.priority > prev.mostCommon.priority:
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107 prev.mostCommon = target
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108 prev = prev.parentNode
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109
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110
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111
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112 # setWord subroutine.
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113 #
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114 # self : instance of self
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115 # wordText : string representing word to add
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116 # priority : integer priority to set the word
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117 # sumFlag : if True, add the priority to the existing, else assign the priority
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118 #
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119 # Returns: None
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120 #
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121 # Purpose: Sets or increments the priority of a word, adding the word if necessary
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122 def setWord(self,wordText,priority = 1,sumFlag = 0):
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123
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124 cur = self.rootNode # start from the root
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125
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126 for ch in wordText: # for each character in the word
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127 if cur.children.has_key(ch): # check to see if we've found a new word
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128
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129 cur = cur.children[ch] # if we haven't found a new word, move to the next letter and try again
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130
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131 else: # in this clause, we're creating a new branch, as the word is new
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132 newLetter = Letter(ch,cur) # create a new class Letter using this ascii code and the current letter as a parent
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133
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134 if cur is self.rootNode: # special case: Others expect the top level letters to point to None, not self.rootNode
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135 newLetter.parentNode = None
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136
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137 cur.children[ch] = newLetter # add the new letter to the list of children of the current letter
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138 cur = newLetter # make the new letter the current one for the next time through
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139
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140 # at this point, cur is pointing to the last letter of either a new or existing word.
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141
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142 if sumFlag: # if the caller wants to add to the existing (0 if new)
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143 cur.priority += priority
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144 else: # else, the set the priority directly
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145 cur.priority = priority
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146
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147 self.updateMostCommon(cur) # this will run back through the tree to fix up the mostCommon members
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148
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149
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150 # addWord subroutine.
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151 #
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152 # self : instance of self
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153 # wordText : string representing word to add
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154 #
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155 # Returns: None
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156 #
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157 # Purpose: Convenience method that wraps setWord. Used to add words known not to exist.
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158 def addWord(self,wordText):
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159 self.setWord(wordText,priority = 1)
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160
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161
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162 # incWord subroutine.
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163 #
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164 # self : instance of self
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165 # wordText : string representing word to add
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166 #
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167 # Returns: None
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168 #
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169 # Purpose: Convenience method that wraps setWord. Used to increment the priority of existing words and add new words.
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170 # Note: Generally, this method can be used instead of addWord.
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171 def incWord(self,wordText):
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172 self.setWord(wordText,priority = 1, sumFlag = 1)
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173
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174
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175 # setWordPriority subroutine.
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176 #
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177 # self : instance of self
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178 # wordText : string representing word to add
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179 # priority: int that is the new priority
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180 #
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181 # Returns: None
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182 #
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183 # Purpose: Convenience method that wraps setWord. Sets existing words to priority or adds new words with priority = priority
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184 def setWordPriority(self,wordText,priority):
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185 self.setWord(wordText,priority = priority)
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186
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187
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188 # findWordNode subroutine.
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189 #
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190 # self : instance of self
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191 # wordText : string representing word to add
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192 #
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193 # Returns: class Letter or None if word isn't found.
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194 #
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195 # Purpose: Given a word, it returns the class Letter node that corresponds to the word. Used mostly in prep for a call to
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196 # getPrediction()
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197 def findWordNode(self,wordText): #returns class Letter that represents the last letter in the word
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198
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199 cur = self.rootNode # start at the root
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200
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201 for ch in wordText: # move through each letter in the word
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202 if cur.children.has_key(ch): # if the next letter exists, make cur equal that letter and loop
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203 cur = cur.children[ch]
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204 else:
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205 return None # return None if letter not found
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206
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207 return cur # return cur, as this points to the last letter if we got this far
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208
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209
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210 # findWordPriority subroutine.
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211 #
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212 # self : instance of self
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213 # wordText : string representing word to add
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214 #
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215 # Returns: Int representing the word's priority or 0 if not found.
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216 #
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217 # Purpose: Returns the priority of the given word
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218 def findWordPriority(self,wordText):
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219
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220 cur = self.findWordNode(wordText) # find the class Letter node that corresponds to this word
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221 if cur:
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222 return cur.priority # if it was found, return it's priority
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223 else:
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224 return 0 # else, return 0, meaning word not found
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225
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226
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227 def printTree(self, current=None):
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228 letters = []
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229 if current is None:
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230 current = self.rootNode
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231
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232 for l, letter in current.children.iteritems():
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233 letters.append(str(letter))
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234 if letter.children != {}:
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235 m = self.printTree(letter)
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236 letters.append(m)
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237
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238 return letters
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239
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240
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241
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242 # getPrediction subroutine.
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243 #
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244 # self : instance of self
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245 # k : ASCII char that was typed
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246 # cur : class Letter that points to the current node in LetterTree
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247 #
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248 # Returns: The predicted text or "" if none found
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249 #
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250 # Purpose: This is the meat and potatoes of data structure. It takes the "current" Letter node and the next key typed
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251 # and returns it's guess of the rest of the word, based on the highest priority letter in the rest of the branch.
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252 def getPrediction(self,k,cur):
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253
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254 if cur.children.has_key(k) : # check to see if the key typed is a sub branch
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255 # If so, make a prediction. Otherwise, do the else at the bottom of
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256 # the method (see below).
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257
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258 cur = cur.children[k] # set the cur to the typed key's class Letter in the sub-branch
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259
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260 backtrace = cur.mostCommon # backtrace is a class Letter. It's used as a placeholder to back trace
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261 # from the last letter of the mostCommon word in the
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262 # sub-tree up through the tree until we meet ourself at cur. We'll
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263 # build the guess text this way
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264
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265 returnText = "" # returnText is a string. This will act as a buffer to hold the string
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266 # we build.
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267
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268 while cur is not backtrace: # Here's the loop. We loop until we've snaked our way back to cur
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269
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270 returnText = backtrace.asciiChar + returnText # Create a new string that is the character at backtrace + everything
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271 # so far. So, for "tion" we'll build "n","on","ion","tion" as we ..
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272
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273 backtrace = backtrace.parentNode # ... climb back towards cur
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274
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275 return returnText # And, having reached here, we've met up with cur, and returnText holds
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276 # the string we built. Return it.
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277
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278 else: # This is the else to the original if.
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279 # If the letter typed isn't in a sub branch, then
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280 # the letter being typed isn't in our tree, so
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281 return "" # return the empty string
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282
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283
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284 # End of class LetterTree!
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285
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286
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287
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288 class _SingletonKey(object):
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289 def __new__(cls, *args, **kwargs):
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290 if not hasattr(cls, '_inst'):
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291 cls._inst = super(_SingletonKey, cls).__new__(cls, *args, **kwargs)
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292 return cls._inst
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293
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294 __key = _SingletonKey()
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295 LetterTree = LetterTreeClass(__key)
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296
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297 # This class extends wx.TextCtrl
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298 #
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299 # Extends: wx.TextCtrl
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300 #
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301 # Overrides:
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302 # wx.TextCtrl.__init__(self,parent,id,value,size,style,name)
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303 # wx.TextCtrl.OnChar(self,Event)
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304 #
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305 # Defines:
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306 # findWord(self,insert,st)
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307 class predTextCtrl(wx.TextCtrl):
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308
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309 # Initialization subroutine.
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310 #
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311 # self : instance of self
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312 # parent: reference to parent window (wxWindow, me-thinks)
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313 # id: new Window Id, default to -1 to create new (I think: see docs for wxPython)
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314 # value: String that is the initial value the control holds, defaulting to ""
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315 # size: defaults to wx.DefaultSize
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316 # style: defaults to 0
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317 # name: defaults to "text"
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318 # keyHook: must be a function pointer that takes self and a GetKeyCode object
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319 # validator: defaults to None
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320 #
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321 # Note: These parameters are essentially just passed back to the native wx.TextCtrl.
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322 # I basically just included (stole) enough of them from chatutils.py to make
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323 # it work. Known missing args are pos and validator, which aren't used by
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324 # chatutils.py.
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325 #
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326 # Returns: None
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327 #
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328 # Purpose: Constructor for predTextCtrl. Calls wx.TextCtrl.__init__ to get default init
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329 # behavior and then inits a LetterTree and captures the parent for later use in
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330 # passing events up the chain.
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331 def __init__(self, parent, id = -1, value = "" , size = wx.DefaultSize, style = 0, name = "text",keyHook = None, validator=None):
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332
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333 # Call super() for default behavior
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334 if validator:
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335 wx.TextCtrl.__init__(self, parent, id=id, value=value, size=size, style=style, name=name, validator=validator )
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336 else:
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337 wx.TextCtrl.__init__(self, parent, id=id, value=value, size=size, style=style, name=name)
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338
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339 self.tree = LetterTree # Instantiate a new LetterTree.
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340 # TODO: make name of word file an argument.
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341
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342
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343
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344
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345 self.parent = parent # Save parent for later use in passing KeyEvents
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346
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347 self.cur = self.tree.rootNode # self.cur is a short cut placeholder for typing consecutive chars
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348 # It may be vestigal
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349
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350 self.keyHook = keyHook # Save the keyHook passed in
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351
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352
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353 # findWord subroutine.
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354 #
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355 # self : instance of self
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356 # insert: index of last char in st
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357 # st : string from insert to the left
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358 #
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359 # Note: This implementation is about the third one for this method. Originally,
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360 # st was an arbitrary string and insert was the point within
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361 # this string to begin looking left. Since, I finally got it
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362 # to work right as it is around 2 in the morning, I'm not touching it, for now.
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363 #
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364 # Returns: String that is the word or "" if none found. This generally doesn't
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365 # happen, as st usually ends in a letter, which will be returned.
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366 #
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367 # Purpose: This function is generally used to figure out the beginning of the
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368 # current word being typed, for later use in a LetterTree.getPrediction()
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369 def findWord(self,insert,st):
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370
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371 # Good luck reading this one. Basically, I started out with an idea, and fiddled with the
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372 # constants as best I could until it worked. It's not a piece of work of which I'm too
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373 # proud. Basically, it's intent is to check each character to the left until it finds one
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374 # that isn't a letter. If it finds such a character, it stops and returns the slice
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375 # from that point to insert. Otherwise, it returns the whole thing, due to begin being
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376 # initialized to 0
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377
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378 begin = 0
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379 for offset in range(insert - 1):
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380 if st[-(offset + 2)] not in string.letters:
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381 begin = insert - (offset + 1)
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382 break
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383 return st[begin:insert]
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384
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385
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386 # OnChar subroutine.
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387 #
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388 # self : instance of self
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389 # event: a GetKeyCode object
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390 #
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391 # Returns: None
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392 #
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393 # Purpose: This function is the key event handler for predTextCtrl. It handles what it
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394 # needs to and passes the event on to it's parent's OnChar method.
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395 def OnChar(self,event):
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396
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397 # Before we do anything, call the keyHook handler, if not None
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398 # This is currently used to implement the typing/not_typing messages in a manner that
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399 # doesn't place the code here. Maybe I should reconsider that. :)
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400 if(self.keyHook):
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401 if self.keyHook(event) == 1: # if the passed in keyHook routine returns a one, it wants no predictive behavior
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402 self.parent.OnChar(event)
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403 return
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404
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405
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406
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407 # This bit converts the GetKeyCode() return (int) to a char if it's in a certain range
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408 asciiKey = ""
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409 if (event.GetKeyCode() < 256) and (event.GetKeyCode() > 19):
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410 asciiKey = chr(event.GetKeyCode())
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411
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412
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413 if asciiKey == "": # If we didn't convert it to a char, then process based on the int GetKeyCodes
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414
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415 if event.GetKeyCode() == wx.WXK_TAB: # We want to hook tabs to allow the user to signify acceptance of a
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416 # predicted word.
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417 # Handle Tab key
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418
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parents:
diff changeset
419 fromPos = toPos = 0 # get the current selection range
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parents:
diff changeset
420 (fromPos,toPos) = self.GetSelection()
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parents:
diff changeset
421
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parents:
diff changeset
422 if (toPos - fromPos) == 0: # if there is no selection, pass tab on
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diff changeset
423 self.parent.OnChar(event)
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parents:
diff changeset
424 return
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parents:
diff changeset
425
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parents:
diff changeset
426 else: # This means at least one char is selected
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parents:
diff changeset
427
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parents:
diff changeset
428 self.SetInsertionPoint(toPos) # move the insertion point to the end of the selection
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diff changeset
429 self.SetSelection(toPos,toPos) # and set the selection to no chars
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parents:
diff changeset
430 # The prediction, if any, had been inserted into the text earlier, so
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sirebral
parents:
diff changeset
431 # moving the insertion point to the spot directly afterwards is
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parents:
diff changeset
432 # equivalent to acceptance. Without this, the next typed key would
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parents:
diff changeset
433 # clobber the prediction.
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parents:
diff changeset
434
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parents:
diff changeset
435 return # Don't pass tab on in this case
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parents:
diff changeset
436
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parents:
diff changeset
437 elif event.GetKeyCode() == wx.WXK_RETURN: # We want to hook returns, so that we can update the word list
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parents:
diff changeset
438
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parents:
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439 st = self.GetValue() # Grab the text from the control
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parents:
diff changeset
440 newSt = "" # Init a buffer
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parents:
diff changeset
441
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parents:
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442 # This block of code, by popular demand, changes the behavior of the control to ignore any prediction that
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parents:
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443 # hasn't been "accepted" when the enter key is struck.
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444 (startSel,endSel) = self.GetSelection() # get the curren selection
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parents:
diff changeset
445
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parents:
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446 #
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parents:
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447 # Start update
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parents:
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448 # Changed the following to allow for more friendly behavior in
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parents:
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449 # a multilined predTextCtrl.
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parents:
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450 #
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451 # front = st[:startSel] # Slice off the text to the front of where we are
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452 # back = st[endSel:] # Slice off the text to the end from where we are
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453 # st = front + back # This expression creates a string that get rid of any selected text.
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454 # self.SetValue(st)
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parents:
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455
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456 self.Remove( startSel, endSel )
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457 st = string.strip( self.GetValue() )
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parents:
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458 #
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parents:
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459 # End update
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parents:
diff changeset
460 #
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parents:
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461
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parents:
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462 # this loop will walk through every character in st and add it to
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parents:
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463 # newSt if it's a letter. If it's not a letter, (e.g. a comma or
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parents:
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464 # hyphen) a space is added to newSt in it's place.
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parents:
diff changeset
465 for ch in st:
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parents:
diff changeset
466 if ch not in string.letters:
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parents:
diff changeset
467 newSt += " "
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parents:
diff changeset
468 else:
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parents:
diff changeset
469 newSt += ch
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parents:
diff changeset
470
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parents:
diff changeset
471 # Now that we've got a string of just letter sequences (words) and spaces
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parents:
diff changeset
472 # split it and to a LetterTree.incWord on the lowercase version of it.
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parents:
diff changeset
473 # Reminder: incWord will increment the priority of existing words and add
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parents:
diff changeset
474 # new ones
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parents:
diff changeset
475 for aWord in string.split(newSt):
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parents:
diff changeset
476 self.tree.incWord(string.lower(aWord))
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sirebral
parents:
diff changeset
477
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parents:
diff changeset
478 self.parent.OnChar(event) # Now that all of the words are added, pass the event and return
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sirebral
parents:
diff changeset
479 return
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sirebral
parents:
diff changeset
480
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sirebral
parents:
diff changeset
481 # We want to capture the right arrow key to fix a slight UI bug that occurs when one right arrows
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sirebral
parents:
diff changeset
482 # out of a selection. I set the InsertionPoint to the beginning of the selection. When the default
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sirebral
parents:
diff changeset
483 # right arrow event occurs, the selection goes away, but the cursor is in an unexpected location.
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sirebral
parents:
diff changeset
484 # This snippet fixes this behavior and then passes on the event.
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parents:
diff changeset
485 elif event.GetKeyCode() == wx.WXK_RIGHT:
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sirebral
parents:
diff changeset
486 (startSel,endSel) = self.GetSelection()
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parents:
diff changeset
487 self.SetInsertionPoint(endSel)
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parents:
diff changeset
488 self.parent.OnChar(event)
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parents:
diff changeset
489 return
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sirebral
parents:
diff changeset
490
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parents:
diff changeset
491 # Ditto as wx.WXK_RIGHT, but for completeness sake
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parents:
diff changeset
492 elif event.GetKeyCode() == wx.WXK_LEFT:
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parents:
diff changeset
493 (startSel,endSel) = self.GetSelection()
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parents:
diff changeset
494 self.SetInsertionPoint(startSel)
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parents:
diff changeset
495 self.parent.OnChar(event)
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parents:
diff changeset
496 return
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sirebral
parents:
diff changeset
497
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sirebral
parents:
diff changeset
498
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sirebral
parents:
diff changeset
499 else:
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parents:
diff changeset
500 # Handle any other non-ascii events by calling parent's OnChar()
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sirebral
parents:
diff changeset
501 self.parent.OnChar(event) #Call super.OnChar to get default behavior
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sirebral
parents:
diff changeset
502 return
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sirebral
parents:
diff changeset
503
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sirebral
parents:
diff changeset
504
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sirebral
parents:
diff changeset
505 elif asciiKey in string.letters:
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sirebral
parents:
diff changeset
506 # This is the real meat and potatoes of predTextCtrl. This is where most of the
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sirebral
parents:
diff changeset
507 # wx.TextCtrl logic is changed.
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sirebral
parents:
diff changeset
508
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sirebral
parents:
diff changeset
509 (startSel,endSel) = self.GetSelection() # get the curren selection
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sirebral
parents:
diff changeset
510 st = self.GetValue() # and the text in the control
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sirebral
parents:
diff changeset
511 front = st[:startSel] # Slice off the text to the front of where we are
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sirebral
parents:
diff changeset
512 back = st[endSel:] # Slice off the text to the end from where we are
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sirebral
parents:
diff changeset
513
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
514 st = front + asciiKey + back # This expression creates a string that will insert the
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sirebral
parents:
diff changeset
515 # typed character (asciiKey is generated at the
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sirebral
parents:
diff changeset
516 # beginning of OnChar()) into the text. If there
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sirebral
parents:
diff changeset
517 # was text selected, that text will not be part
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sirebral
parents:
diff changeset
518 # of the new string, due to the way front and back
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sirebral
parents:
diff changeset
519 # were sliced.
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sirebral
parents:
diff changeset
520
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parents:
diff changeset
521 insert = startSel + 1 # creates an int that denotes where the new InsertionPoint
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sirebral
parents:
diff changeset
522 # should be.
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sirebral
parents:
diff changeset
523
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
524 curWord = "" # Assume there's a problem with finding the curWord
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sirebral
parents:
diff changeset
525
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
526 if (len(back) == 0) or (back[0] not in string.letters): # We should only insert a prediction if we are typing
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parents:
diff changeset
527 # at the end of a word, not in the middle. There are
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sirebral
parents:
diff changeset
528 # three cases: we are typing at the end of the string or
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sirebral
parents:
diff changeset
529 # we are typing in the middle of the string and the next
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sirebral
parents:
diff changeset
530 # char is NOT a letter or we are typing in the middle of the
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sirebral
parents:
diff changeset
531 # string and the next char IS a letter. Only the former two
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sirebral
parents:
diff changeset
532 # cases denote that we should make a prediction
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sirebral
parents:
diff changeset
533 # Note: The order of the two logical clauses here is important!
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sirebral
parents:
diff changeset
534 # If len(back) == 0, then the expression back[0] will
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sirebral
parents:
diff changeset
535 # blow up with an out of bounds array subscript. Luckily
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sirebral
parents:
diff changeset
536 # the or operator is a short-circuit operator and in this
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sirebral
parents:
diff changeset
537 # case will only evaluate back[0] if len(back) != 0, in
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sirebral
parents:
diff changeset
538 # which we're safely in bounds.
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sirebral
parents:
diff changeset
539
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
540 curWord = self.findWord(insert,front + asciiKey) # Now that we know we're supposed to make a prediction,
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sirebral
parents:
diff changeset
541 # let's find what word root to use in our prediction.
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sirebral
parents:
diff changeset
542 # Note: This is using the confusing findWord method. I
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sirebral
parents:
diff changeset
543 # send it insert and the text from the beginning
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sirebral
parents:
diff changeset
544 # of the text through the key just entered. This is
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sirebral
parents:
diff changeset
545 # NOT the original usage, but it does work. See
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sirebral
parents:
diff changeset
546 # findWord() for more details.
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sirebral
parents:
diff changeset
547
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sirebral
parents:
diff changeset
548 else: # Here, we've found we're in the middle of a word, so we're
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sirebral
parents:
diff changeset
549 # going to call the parent's event handler.
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sirebral
parents:
diff changeset
550 self.parent.OnChar(event)
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sirebral
parents:
diff changeset
551 return
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sirebral
parents:
diff changeset
552
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
553 if curWord == "": # Here, we do a quick check to make sure we have a good root
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sirebral
parents:
diff changeset
554 # word. If not, allow the default thing to happen. Of course,
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555 # now that I'm documenting this, it occurs to me to wonder why
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556 # I didn't do the same thing I just talked about. Hmmmmmm.
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557
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558 self.parent.OnChar(event) # we're done here
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559 return
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560
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561 self.cur = self.tree.findWordNode(string.lower(curWord[:-1])) # Still with me? We're almost done. At this point, we
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parents:
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562 # need to convert our word string to a Letter node,
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563 # because that's what getPrediction expects. Notice
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564 # that we're feeding in the string with the last
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565 # char sliced off. For developmentally historical
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566 # reasons, getPrediction wants the node just before
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567 # the typed character and the typed char separately.
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568
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569
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570 if self.cur is None:
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571 self.parent.OnChar(event) # if there's no word or no match, we're done
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parents:
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572 return
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parents:
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573
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parents:
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574
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575 # get the prediction
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576 predictText = self.tree.getPrediction(string.lower(asciiKey),self.cur) # This is the big prediction, as noted above
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577 # Note the use of string.lower() because we
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parents:
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578 # keep the word list in all lower case,but we
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parents:
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579 # want to be able to match any capitalization
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parents:
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580
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parents:
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581 if predictText == "":
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582 self.parent.OnChar(event) # if there's no prediction, we're done
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parents:
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583 return
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sirebral
parents:
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584
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585 # And now for the big finale. We're going to take the string st
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sirebral
parents:
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586 # we created earlier and insert the prediction right after the
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sirebral
parents:
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587 # newly typed character.
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588 front = st[:insert] # Grab a new front from st
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parents:
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589 back = st[insert:] # Grab a new back
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parents:
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590
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591 st = front + predictText + back # Insert the prediction
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parents:
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592
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593 self.SetValue(st) # Now, overwrite the controls text with the new text
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594 self.SetInsertionPoint(insert) # Set the proper insertion point, directly behind the
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sirebral
parents:
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595 # newly typed character and directly in front of the
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parents:
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596 # predicted text.
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parents:
diff changeset
597
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598 self.SetSelection(insert,insert+len(predictText)) # Very important! Set the selection to encompass the predicted
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parents:
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599 # text. This way, the user can ignore the prediction by simply
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parents:
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600 # continuing to type. Remember, if the user wants the prediction
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parents:
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601 # s/he must strike the tab key at this point. Of course, one could
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602 # just use the right arrow key as well, but that's not as easy to
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parents:
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603 # reach.
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parents:
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604
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605 return # Done! Do NOT pass the event on at this point, because it's all done.
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parents:
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606
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sirebral
parents:
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607
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608 else:
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parents:
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609 # Handle every other non-letter ascii (e.g. semicolon) by passing the event on.
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610 self.parent.OnChar(event) #Call super.OnChar to get default behavior
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611 return
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612
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parents:
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613 # End of class predTextCtrl!