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Fix abbreviations processing for English (A7) 

It's still incorrect for non-English languages.

Bug: 4967874
Change-Id: I3d4379265f72e1c0435eba90ab878a80bbcf55ce
main
Jean Chalard 2012-09-13 20:09:52 +09:00
parent b29efecd26
commit 2c0d916287
2 changed files with 123 additions and 27 deletions
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109
java/src/com/android/inputmethod/latin/StringUtils.java
View File

@ -304,34 +304,89 @@ public final class StringUtils {
}
if (j <= 0) return TextUtils.CAP_MODE_CHARACTERS & reqModes;
char c = cs.charAt(j - 1);
if (c == Keyboard.CODE_PERIOD || c == Keyboard.CODE_QUESTION_MARK
|| c == Keyboard.CODE_EXCLAMATION_MARK) {
// Here we found a marker for sentence end (we consider these to be one of
// either . or ? or ! only). So this is probably the end of a sentence, but if we
// found a period, we still want to check the case where this is a abbreviation
// period rather than a full stop. To do this, we look for a period within a word
// before the period we just found; if any, we take that to mean it was an
// abbreviation.
// A typical example of the above is "In the U.S. ", where the last period is
// not a full stop and we should not capitalize.
// TODO: the rule below is broken. In particular it fails for runs of periods,
// whatever the reason. In the example "in the U.S..", the last period is a full
// stop following the abbreviation period, and we should capitalize but we don't.
// Likewise, "I don't know... " should capitalize, but fails to do so.
if (c == Keyboard.CODE_PERIOD) {
for (int k = j - 2; k >= 0; k--) {
c = cs.charAt(k);
if (c == Keyboard.CODE_PERIOD) {
return TextUtils.CAP_MODE_CHARACTERS & reqModes;
}
if (!Character.isLetter(c)) {
break;
}
}
}
char c = cs.charAt(--j);
// We found the next interesting chunk of text ; next we need to determine if it's the
// end of a sentence. If we have a question mark or an exclamation mark, it's the end of
// a sentence. If it's neither, the only remaining case is the period so we get the opposite
// case out of the way.
if (c == Keyboard.CODE_QUESTION_MARK || c == Keyboard.CODE_EXCLAMATION_MARK) {
return (TextUtils.CAP_MODE_CHARACTERS | TextUtils.CAP_MODE_SENTENCES) & reqModes;
}
return TextUtils.CAP_MODE_CHARACTERS & reqModes;
if (c != Keyboard.CODE_PERIOD || j <= 0) {
return (TextUtils.CAP_MODE_CHARACTERS | TextUtils.CAP_MODE_WORDS) & reqModes;
}
// We found out that we have a period. We need to determine if this is a full stop or
// otherwise sentence-ending period, or an abbreviation like "e.g.". An abbreviation
// looks like (\w\.){2,}
// To find out, we will have a simple state machine with the following states :
// START, WORD, PERIOD, ABBREVIATION
// On START : (just before the first period)
// letter => WORD
// whitespace => end with no caps (it was a stand-alone period)
// otherwise => end with caps (several periods/symbols in a row)
// On WORD : (within the word just before the first period)
// letter => WORD
// period => PERIOD
// otherwise => end with caps (it was a word with a full stop at the end)
// On PERIOD : (period within a potential abbreviation)
// letter => LETTER
// otherwise => end with caps (it was not an abbreviation)
// On LETTER : (letter within a potential abbreviation)
// letter => LETTER
// period => PERIOD
// otherwise => end with no caps (it was an abbreviation)
// "Not an abbreviation" in the above chart essentially covers cases like "...yes.". This
// should capitalize.
final int START = 0;
final int WORD = 1;
final int PERIOD = 2;
final int LETTER = 3;
final int caps = (TextUtils.CAP_MODE_CHARACTERS | TextUtils.CAP_MODE_WORDS
| TextUtils.CAP_MODE_SENTENCES) & reqModes;
final int noCaps = (TextUtils.CAP_MODE_CHARACTERS | TextUtils.CAP_MODE_WORDS) & reqModes;
int state = START;
while (j > 0) {
c = cs.charAt(--j);
switch (state) {
case START:
if (Character.isLetter(c)) {
state = WORD;
} else if (Character.isWhitespace(c)) {
return noCaps;
} else {
return caps;
}
break;
case WORD:
if (Character.isLetter(c)) {
state = WORD;
} else if (c == Keyboard.CODE_PERIOD) {
state = PERIOD;
} else {
return caps;
}
break;
case PERIOD:
if (Character.isLetter(c)) {
state = LETTER;
} else {
return caps;
}
break;
case LETTER:
if (Character.isLetter(c)) {
state = LETTER;
} else if (c == Keyboard.CODE_PERIOD) {
state = PERIOD;
} else {
return noCaps;
}
}
}
// Here we arrived at the start of the line. This should behave exactly like whitespace.
return (START == state || LETTER == state) ? noCaps : caps;
}
}

41
tests/src/com/android/inputmethod/latin/StringUtilsTests.java
View File

@ -17,6 +17,7 @@
package com.android.inputmethod.latin;
import android.test.AndroidTestCase;
import android.text.TextUtils;
public class StringUtilsTests extends AndroidTestCase {
public void testContainsInArray() {
@ -99,4 +100,44 @@ public class StringUtilsTests extends AndroidTestCase {
assertFalse("lower-case string", StringUtils.hasUpperCase("string"));
assertFalse("lower-case string with non-letters", StringUtils.hasUpperCase("he's"));
}
private void onePathForCaps(final CharSequence cs, final int expectedResult, final int mask) {
int oneTimeResult = expectedResult & mask;
assertEquals("After >" + cs + "<", oneTimeResult, StringUtils.getCapsMode(cs, mask));
}
private void allPathsForCaps(final CharSequence cs, final int expectedResult) {
final int c = TextUtils.CAP_MODE_CHARACTERS;
final int w = TextUtils.CAP_MODE_WORDS;
final int s = TextUtils.CAP_MODE_SENTENCES;
onePathForCaps(cs, expectedResult, c | w | s);
onePathForCaps(cs, expectedResult, w | s);
onePathForCaps(cs, expectedResult, c | s);
onePathForCaps(cs, expectedResult, c | w);
onePathForCaps(cs, expectedResult, c);
onePathForCaps(cs, expectedResult, w);
onePathForCaps(cs, expectedResult, s);
}
public void testGetCapsMode() {
final int c = TextUtils.CAP_MODE_CHARACTERS;
final int w = TextUtils.CAP_MODE_WORDS;
final int s = TextUtils.CAP_MODE_SENTENCES;
allPathsForCaps("", c | w | s);
allPathsForCaps("Word", c);
allPathsForCaps("Word.", c);
allPathsForCaps("Word ", c | w);
allPathsForCaps("Word. ", c | w | s);
allPathsForCaps("Word..", c);
allPathsForCaps("Word.. ", c | w | s);
allPathsForCaps("Word... ", c | w | s);
allPathsForCaps("Word ... ", c | w | s);
allPathsForCaps("Word . ", c | w);
allPathsForCaps("In the U.S ", c | w);
allPathsForCaps("In the U.S. ", c | w);
allPathsForCaps("Some stuff (e.g. ", c | w);
allPathsForCaps("In the U.S.. ", c | w | s);
allPathsForCaps("\"Word.\" ", c | w | s);
allPathsForCaps("\"Word\" ", c | w);
}
}