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Tweak edit distance

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- The edit distance of transposed characters will be changed to 1 from 2

Change-Id: I369e2f94278b3b290957eef43d23cb7048166a99
This commit is contained in:
satok 2011-04-20 14:52:11 +09:00
parent 63546344b3
commit e18ba4275f
1 changed files with 22 additions and 5 deletions
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27
java/src/com/android/inputmethod/latin/Utils.java
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@ -258,6 +258,8 @@ public class Utils {
}
}
/* Damerau-Levenshtein distance */
public static int editDistance(CharSequence s, CharSequence t) {
if (s == null || t == null) {
throw new IllegalArgumentException("editDistance: Arguments should not be null.");
@ -273,14 +275,29 @@ public class Utils {
}
for (int i = 0; i < sl; ++i) {
for (int j = 0; j < tl; ++j) {
if (Character.toLowerCase(s.charAt(i)) == Character.toLowerCase(t.charAt(j))) {
dp[i + 1][j + 1] = dp[i][j];
} else {
dp[i + 1][j + 1] = 1 + Math.min(dp[i][j],
Math.min(dp[i + 1][j], dp[i][j + 1]));
final char sc = Character.toLowerCase(s.charAt(i));
final char tc = Character.toLowerCase(t.charAt(j));
final int cost = sc == tc ? 0 : 1;
dp[i + 1][j + 1] = Math.min(
dp[i][j + 1] + 1, Math.min(dp[i + 1][j] + 1, dp[i][j] + cost));
// Overwrite for transposition cases
if (i > 0 && j > 0
&& sc == Character.toLowerCase(t.charAt(j - 1))
&& tc == Character.toLowerCase(s.charAt(i - 1))) {
dp[i + 1][j + 1] = Math.min(dp[i + 1][j + 1], dp[i - 1][j - 1] + cost);
}
}
}
if (LatinImeLogger.sDBG) {
Log.d(TAG, "editDistance:" + s + "," + t);
for (int i = 0; i < dp.length; ++i) {
StringBuffer sb = new StringBuffer();
for (int j = 0; j < dp[i].length; ++j) {
sb.append(dp[i][j]).append(',');
}
Log.d(TAG, i + ":" + sb.toString());
}
}
return dp[sl][tl];
}