Mercurial > traipse_dev
annotate orpg/tools/predTextCtrl.py @ 0:4385a7d0efd1 grumpy-goblin
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author | sirebral |
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date | Tue, 14 Jul 2009 16:41:58 -0500 |
parents | |
children | 5aff3ef1ae46 |
rev | line source |
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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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419 fromPos = toPos = 0 # get the current selection range |
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420 (fromPos,toPos) = self.GetSelection() |
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421 |
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422 if (toPos - fromPos) == 0: # if there is no selection, pass tab on |
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423 self.parent.OnChar(event) |
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424 return |
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425 |
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426 else: # This means at least one char is selected |
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427 |
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428 self.SetInsertionPoint(toPos) # move the insertion point to the end of the selection |
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429 self.SetSelection(toPos,toPos) # and set the selection to no chars |
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430 # The prediction, if any, had been inserted into the text earlier, so |
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431 # moving the insertion point to the spot directly afterwards is |
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432 # equivalent to acceptance. Without this, the next typed key would |
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433 # clobber the prediction. |
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434 |
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435 return # Don't pass tab on in this case |
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436 |
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437 elif event.GetKeyCode() == wx.WXK_RETURN: # We want to hook returns, so that we can update the word list |
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438 |
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439 st = self.GetValue() # Grab the text from the control |
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440 newSt = "" # Init a buffer |
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441 |
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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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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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445 |
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446 # |
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447 # Start update |
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448 # Changed the following to allow for more friendly behavior in |
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449 # a multilined predTextCtrl. |
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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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455 |
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456 self.Remove( startSel, endSel ) |
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457 st = string.strip( self.GetValue() ) |
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458 # |
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459 # End update |
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460 # |
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461 |
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462 # this loop will walk through every character in st and add it to |
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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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464 # hyphen) a space is added to newSt in it's place. |
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465 for ch in st: |
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466 if ch not in string.letters: |
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467 newSt += " " |
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468 else: |
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469 newSt += ch |
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470 |
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471 # Now that we've got a string of just letter sequences (words) and spaces |
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472 # split it and to a LetterTree.incWord on the lowercase version of it. |
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473 # Reminder: incWord will increment the priority of existing words and add |
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474 # new ones |
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475 for aWord in string.split(newSt): |
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476 self.tree.incWord(string.lower(aWord)) |
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477 |
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478 self.parent.OnChar(event) # Now that all of the words are added, pass the event and return |
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479 return |
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480 |
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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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482 # out of a selection. I set the InsertionPoint to the beginning of the selection. When the default |
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483 # right arrow event occurs, the selection goes away, but the cursor is in an unexpected location. |
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484 # This snippet fixes this behavior and then passes on the event. |
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485 elif event.GetKeyCode() == wx.WXK_RIGHT: |
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486 (startSel,endSel) = self.GetSelection() |
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487 self.SetInsertionPoint(endSel) |
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488 self.parent.OnChar(event) |
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489 return |
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490 |
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491 # Ditto as wx.WXK_RIGHT, but for completeness sake |
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492 elif event.GetKeyCode() == wx.WXK_LEFT: |
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493 (startSel,endSel) = self.GetSelection() |
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494 self.SetInsertionPoint(startSel) |
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495 self.parent.OnChar(event) |
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496 return |
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497 |
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498 |
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499 else: |
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500 # Handle any other non-ascii events by calling parent's OnChar() |
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501 self.parent.OnChar(event) #Call super.OnChar to get default behavior |
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502 return |
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503 |
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504 |
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505 elif asciiKey in string.letters: |
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506 # This is the real meat and potatoes of predTextCtrl. This is where most of the |
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507 # wx.TextCtrl logic is changed. |
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508 |
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509 (startSel,endSel) = self.GetSelection() # get the curren selection |
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510 st = self.GetValue() # and the text in the control |
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511 front = st[:startSel] # Slice off the text to the front of where we are |
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512 back = st[endSel:] # Slice off the text to the end from where we are |
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513 |
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514 st = front + asciiKey + back # This expression creates a string that will insert the |
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515 # typed character (asciiKey is generated at the |
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516 # beginning of OnChar()) into the text. If there |
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517 # was text selected, that text will not be part |
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518 # of the new string, due to the way front and back |
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519 # were sliced. |
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520 |
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521 insert = startSel + 1 # creates an int that denotes where the new InsertionPoint |
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522 # should be. |
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523 |
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524 curWord = "" # Assume there's a problem with finding the curWord |
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525 |
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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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527 # at the end of a word, not in the middle. There are |
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528 # three cases: we are typing at the end of the string or |
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529 # we are typing in the middle of the string and the next |
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530 # char is NOT a letter or we are typing in the middle of the |
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531 # string and the next char IS a letter. Only the former two |
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532 # cases denote that we should make a prediction |
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533 # Note: The order of the two logical clauses here is important! |
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534 # If len(back) == 0, then the expression back[0] will |
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535 # blow up with an out of bounds array subscript. Luckily |
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536 # the or operator is a short-circuit operator and in this |
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537 # case will only evaluate back[0] if len(back) != 0, in |
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538 # which we're safely in bounds. |
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539 |
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540 curWord = self.findWord(insert,front + asciiKey) # Now that we know we're supposed to make a prediction, |
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541 # let's find what word root to use in our prediction. |
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542 # Note: This is using the confusing findWord method. I |
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543 # send it insert and the text from the beginning |
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544 # of the text through the key just entered. This is |
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545 # NOT the original usage, but it does work. See |
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546 # findWord() for more details. |
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547 |
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548 else: # Here, we've found we're in the middle of a word, so we're |
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549 # going to call the parent's event handler. |
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550 self.parent.OnChar(event) |
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551 return |
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552 |
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553 if curWord == "": # Here, we do a quick check to make sure we have a good root |
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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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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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572 return |
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573 |
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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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578 # keep the word list in all lower case,but we |
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579 # want to be able to match any capitalization |
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580 |
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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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583 return |
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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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586 # we created earlier and insert the prediction right after the |
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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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589 back = st[insert:] # Grab a new back |
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|
590 |
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591 st = front + predictText + back # Insert the prediction |
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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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595 # newly typed character and directly in front of the |
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596 # predicted text. |
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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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599 # text. This way, the user can ignore the prediction by simply |
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|
600 # continuing to type. Remember, if the user wants the prediction |
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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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603 # reach. |
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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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606 |
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607 |
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608 else: |
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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 |
4385a7d0efd1
Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
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611 return |
4385a7d0efd1
Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
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612 |
4385a7d0efd1
Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
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613 # End of class predTextCtrl! |