Try to figure out whether d.quotes open or close.

Bug: 8911672
Change-Id: I5d5635949530a67f95e5208986907251b7bce903

java/src/com/android/inputmethod/latin/RichInputConnection.java

@@ -814,6 +814,17 @@ public final class RichInputConnection {
         return StringUtils.lastPartLooksLikeURL(mCommittedTextBeforeComposingText);
     }
 
+    /**
+     * Looks at the text just before the cursor to find out if we are inside a double quote.
+     *
+     * As with #textBeforeCursorLooksLikeURL, this is dependent on how much text we have cached.
+     * However this won't be a concrete problem in most situations, as the cache is almost always
+     * long enough for this use.
+     */
+    public boolean isInsideDoubleQuoteOrAfterDigit() {
+        return StringUtils.isInsideDoubleQuoteOrAfterDigit(mCommittedTextBeforeComposingText);
+    }
+
     /**
      * Try to get the text from the editor to expose lies the framework may have been
      * telling us. Concretely, when the device rotates, the frameworks tells us about where the

java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java

@@ -602,8 +602,21 @@ public final class InputLogic {
         final boolean swapWeakSpace = maybeStripSpace(settingsValues, codePoint, spaceState,
                 isFromSuggestionStrip);
 
-        if (SpaceState.PHANTOM == spaceState &&
+        final boolean isInsideDoubleQuoteOrAfterDigit = Constants.CODE_DOUBLE_QUOTE == codePoint
-                settingsValues.isUsuallyPrecededBySpace(codePoint)) {
+                && mConnection.isInsideDoubleQuoteOrAfterDigit();
+
+        final boolean needsPrecedingSpace;
+        if (SpaceState.PHANTOM != spaceState) {
+            needsPrecedingSpace = false;
+        } else if (Constants.CODE_DOUBLE_QUOTE == codePoint) {
+            // Double quotes behave like they are usually preceded by space iff we are
+            // not inside a double quote or after a digit.
+            needsPrecedingSpace = !isInsideDoubleQuoteOrAfterDigit;
+        } else {
+            needsPrecedingSpace = settingsValues.isUsuallyPrecededBySpace(codePoint);
+        }
+
+        if (needsPrecedingSpace) {
             promotePhantomSpace(settingsValues);
         }
         if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
@@ -630,14 +643,17 @@ public final class InputLogic {
             if (swapWeakSpace) {
                 swapSwapperAndSpace(keyboardSwitcher);
                 mSpaceState = SpaceState.SWAP_PUNCTUATION;
-            } else if (SpaceState.PHANTOM == spaceState
+            } else if ((SpaceState.PHANTOM == spaceState
-                    && settingsValues.isUsuallyFollowedBySpace(codePoint)) {
+                    && settingsValues.isUsuallyFollowedBySpace(codePoint))
+                    || (Constants.CODE_DOUBLE_QUOTE == codePoint
+                            && isInsideDoubleQuoteOrAfterDigit)) {
                 // If we are in phantom space state, and the user presses a separator, we want to
                 // stay in phantom space state so that the next keypress has a chance to add the
                 // space. For example, if I type "Good dat", pick "day" from the suggestion strip
                 // then insert a comma and go on to typing the next word, I want the space to be
                 // inserted automatically before the next word, the same way it is when I don't
-                // input the comma.
+                // input the comma. A double quote behaves like it's usually followed by space if
+                // we're inside a double quote.
                 // The case is a little different if the separator is a space stripper. Such a
                 // separator does not normally need a space on the right (that's the difference
                 // between swappers and strippers), so we should not stay in phantom space state if

java/src/com/android/inputmethod/latin/utils/StringUtils.java

@@ -387,6 +387,48 @@ public final class StringUtils {
         return false;
     }
 
+    /**
+     * Examines the string and returns whether we're inside a double quote.
+     *
+     * This is used to decide whether we should put an automatic space before or after a double
+     * quote character. If we're inside a quotation, then we want to close it, so we want a space
+     * after and not before. Otherwise, we want to open the quotation, so we want a space before
+     * and not after. Exception: after a digit, we never want a space because the "inch" or
+     * "minutes" use cases is dominant after digits.
+     * In the practice, we determine whether we are in a quotation or not by finding the previous
+     * double quote character, and looking at whether it's followed by whitespace. If so, that
+     * was a closing quotation mark, so we're not inside a double quote. If it's not followed
+     * by whitespace, then it was an opening quotation mark, and we're inside a quotation.
+     *
+     * @param text the text to examine.
+     * @return whether we're inside a double quote.
+     */
+    public static boolean isInsideDoubleQuoteOrAfterDigit(final CharSequence text) {
+        int i = text.length();
+        if (0 == i) return false;
+        int codePoint = Character.codePointBefore(text, i);
+        if (Character.isDigit(codePoint)) return true;
+        int prevCodePoint = 0;
+        while (i > 0) {
+            codePoint = Character.codePointBefore(text, i);
+            if (Constants.CODE_DOUBLE_QUOTE == codePoint) {
+                // If we see a double quote followed by whitespace, then that
+                // was a closing quote.
+                if (Character.isWhitespace(prevCodePoint)) return false;
+            }
+            if (Character.isWhitespace(codePoint) && Constants.CODE_DOUBLE_QUOTE == prevCodePoint) {
+                // If we see a double quote preceded by whitespace, then that
+                // was an opening quote. No need to continue seeking.
+                return true;
+            }
+            i -= Character.charCount(codePoint);
+            prevCodePoint = codePoint;
+        }
+        // We reached the start of text. If the first char is a double quote, then we're inside
+        // a double quote. Otherwise we're not.
+        return Constants.CODE_DOUBLE_QUOTE == codePoint;
+    }
+
     public static boolean isEmptyStringOrWhiteSpaces(final String s) {
         final int N = codePointCount(s);
         for (int i = 0; i < N; ++i) {

tests/src/com/android/inputmethod/latin/PunctuationTests.java

@@ -169,4 +169,32 @@ public class PunctuationTests extends InputTestsBase {
                 + " ; Suggestions = " + mLatinIME.getSuggestedWords(),
                 EXPECTED_RESULT, mEditText.getText().toString());
     }
+
+    public void testAutoSpaceWithDoubleQuotes() {
+        final String STRING_TO_TYPE = "He said\"hello\"to me. I replied,\"hi\"."
+                + "Then, 5\"passed. He said\"bye\"and left.";
+        final String EXPECTED_RESULT = "He said \"hello\" to me. I replied, \"hi\". "
+                + "Then, 5\" passed. He said \"bye\" and left. \"";
+        // Split by double quote, so that we can type the double quotes individually.
+        for (final String partToType : STRING_TO_TYPE.split("\"")) {
+            // Split at word boundaries. This regexp means "anywhere that is preceded
+            // by a word character but not followed by a word character, OR that is not
+            // preceded by a word character but followed by a word character".
+            // We need to input word by word because auto-spaces are only active when
+            // manually picking or gesturing (which we can't simulate yet), but only words
+            // can be picked.
+            final String[] wordsToType = partToType.split("(?<=\\w)(?!\\w)|(?<!\\w)(?=\\w)");
+            for (final String wordToType : wordsToType) {
+                type(wordToType);
+                if (wordToType.matches("^\\w+$")) {
+                    // Only pick selection if that was a word, because if that was not a word,
+                    // then we don't have a composition.
+                    pickSuggestionManually(0, wordToType);
+                }
+            }
+            type("\"");
+        }
+        assertEquals("auto-space with double quotes",
+                EXPECTED_RESULT, mEditText.getText().toString());
+    }
 }