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-rw-r--r--java/src/com/android/inputmethod/latin/StringUtils.java107
-rw-r--r--tests/src/com/android/inputmethod/latin/StringUtilsTests.java41
2 files changed, 122 insertions, 26 deletions
diff --git a/java/src/com/android/inputmethod/latin/StringUtils.java b/java/src/com/android/inputmethod/latin/StringUtils.java
index 8696a5caf..b4f3b4bc9 100644
--- a/java/src/com/android/inputmethod/latin/StringUtils.java
+++ b/java/src/com/android/inputmethod/latin/StringUtils.java
@@ -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;
+ }
+ 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;
}
}
- return (TextUtils.CAP_MODE_CHARACTERS | TextUtils.CAP_MODE_SENTENCES) & reqModes;
}
- return TextUtils.CAP_MODE_CHARACTERS & reqModes;
+ // Here we arrived at the start of the line. This should behave exactly like whitespace.
+ return (START == state || LETTER == state) ? noCaps : caps;
}
}
diff --git a/tests/src/com/android/inputmethod/latin/StringUtilsTests.java b/tests/src/com/android/inputmethod/latin/StringUtilsTests.java
index 5db06ef51..0cef28c74 100644
--- a/tests/src/com/android/inputmethod/latin/StringUtilsTests.java
+++ b/tests/src/com/android/inputmethod/latin/StringUtilsTests.java
@@ -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);
+ }
}
generated by cgit v1.2.3-83-g751a (git 2.47.1) at 2025-05-30 12:32:57 +0000