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Filter out of spellchecking words that don't look like words

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Note that this affects only the results of the spell checker if
actually passed such a word. For example, the spell checker will
not flag "http://oju" as a typo, because it looks like a URL.
But in the current implementation, TextView passes "http" and
"oju" separately, so "oju" is still flagged as a typo.

Bug: 5281875
Change-Id: I9d721fd3af34edc51b11908cf2e8fe994b164242
This commit is contained in:
Jean Chalard 2011-09-13 22:10:08 +09:00
parent 14c840fb27
commit 88fa53b840
1 changed files with 37 additions and 1 deletions
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38
java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java
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@ -282,6 +282,42 @@ public class AndroidSpellCheckerService extends SpellCheckerService {
mLocale = LocaleUtils.constructLocaleFromString(localeString);
}
/**
* Finds out whether a particular string should be filtered out of spell checking.
*
* This will loosely match URLs, numbers, symbols.
*
* @param text the string to evaluate.
* @return true if we should filter this text out, false otherwise
*/
private boolean shouldFilterOut(final String text) {
if (TextUtils.isEmpty(text) || text.length() <= 1) return true;
// TODO: check if an equivalent processing can't be done more quickly with a
// compiled regexp.
// Filter by first letter
final int firstCodePoint = text.codePointAt(0);
// Filter out words that don't start with a letter or an apostrophe
if (!Character.isLetter(firstCodePoint)
&& '\'' != firstCodePoint) return true;
// Filter contents
final int length = text.length();
int letterCount = 0;
for (int i = 0; i < length; ++i) {
final int codePoint = text.codePointAt(i);
// Any word containing a '@' is probably an e-mail address
// Any word containing a '/' is probably either an ad-hoc combination of two
// words or a URI - in either case we don't want to spell check that
if ('@' == codePoint
|| '/' == codePoint) return true;
if (Character.isLetter(codePoint)) ++letterCount;
}
// Guestimate heuristic: perform spell checking if at least 3/4 of the characters
// in this word are letters
return (letterCount * 4 < length * 3);
}
// Note : this must be reentrant
/**
* Gets a list of suggestions for a specific string. This returns a list of possible
@ -293,7 +329,7 @@ public class AndroidSpellCheckerService extends SpellCheckerService {
final int suggestionsLimit) {
final String text = textInfo.getText();
if (TextUtils.isEmpty(text) || text.length() <= 1) return EMPTY_SUGGESTIONS_INFO;
if (shouldFilterOut(text)) return EMPTY_SUGGESTIONS_INFO;
final SuggestionsGatherer suggestionsGatherer =
new SuggestionsGatherer(suggestionsLimit);