commit 1b62ff1a3d61cd44ab88acdfcbdf0fc70a7e1b10
author Amith Yamasani <yamasani@google.com> Fri Feb 05 14:07:04 2010 -0800
committer Amith Yamasani <yamasani@google.com> Mon Feb 08 15:22:37 2010 -0800
tree 17739a10acf4f7f9e70b82ba4d0a2f1c17c914b4
parent 8fa317a61a2152347c59dda7eb1b8e2979f6cc1d

Increase target size of preferred letters while typing.

This increases the chance of hitting the correct letter when typing a word
that exists in the dictionary, rather than only correct it after the fact.
It is most effective after 2 or 3 letters of a word have been typed and gets
more accurate with more typed letters in the word.

If 2 adjacent letters have similar probabilities of occuring, then there is no
hit correction applied.

dictionary/src/dictionary.cpp

diff --git a/dictionary/src/dictionary.cpp b/dictionary/src/dictionary.cpp
index 306aff5..6e6f441 100644
--- a/dictionary/src/dictionary.cpp
+++ b/dictionary/src/dictionary.cpp
@@ -49,7 +49,8 @@
 }
 
 int Dictionary::getSuggestions(int *codes, int codesSize, unsigned short *outWords, int *frequencies,
-        int maxWordLength, int maxWords, int maxAlternatives, int skipPos)
+        int maxWordLength, int maxWords, int maxAlternatives, int skipPos,
+        int *nextLetters, int nextLettersSize)
 {
     int suggWords;
     mFrequencies = frequencies;
@@ -61,6 +62,8 @@
     mMaxWords = maxWords;
     mSkipPos = skipPos;
     mMaxEditDistance = mInputLength < 5 ? 2 : mInputLength / 2;
+    mNextLettersFrequencies = nextLetters;
+    mNextLettersSize = nextLettersSize;
 
     getWordsRec(0, 0, mInputLength * 3, false, 1, 0, 0);
 
@@ -68,9 +71,27 @@
     suggWords = 0;
     while (suggWords < mMaxWords && mFrequencies[suggWords] > 0) suggWords++;
     if (DEBUG_DICT) LOGI("Returning %d words", suggWords);
+
+    if (DEBUG_DICT) {
+        LOGI("Next letters: ");
+        for (int k = 0; k < nextLettersSize; k++) {
+            if (mNextLettersFrequencies[k] > 0) {
+                LOGI("%c = %d,", k, mNextLettersFrequencies[k]);
+            }
+        }
+        LOGI("\n");
+    }
     return suggWords;
 }
 
+void
+Dictionary::registerNextLetter(unsigned short c)
+{
+    if (c < mNextLettersSize) {
+        mNextLettersFrequencies[c]++;
+    }
+}
+
 unsigned short
 Dictionary::getChar(int *pos)
 {
@@ -210,6 +231,9 @@
             mWord[depth] = c;
             if (terminal) {
                 addWord(mWord, depth + 1, freq * snr);
+                if (depth >= mInputLength && mSkipPos < 0) {
+                    registerNextLetter(mWord[mInputLength]);
+                }
             }
             if (childrenAddress != 0) {
                 getWordsRec(childrenAddress, depth + 1, maxDepth,