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Faster and simpler replace in SSB, take two

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This is a new version of CL 179343 which had to be reverted.

This problem of the previous CL is that the ComposingSpan that
was part of the replacement text was correctly added during the
replace but was immediately removed because it had a zero-length
size.

Swapping the add and remove blocks solves the problem.

The new non-zero length enforcement also revealed a bug in the
spell checker where we were creating useless range spans.

Change-Id: I59cebd4708af3becc7ab625ae41bc36837f1a1cf
This commit is contained in:
Gilles Debunne
2012-04-09 16:02:31 -07:00
parent 7405b90df4
commit 0249b43f6c
2 changed files with 70 additions and 90 deletions
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147
core/java/android/text/SpannableStringBuilder.java
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@@ -50,6 +50,8 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
public SpannableStringBuilder(CharSequence text, int start, int end) {
int srclen = end - start;
if (srclen < 0) throw new StringIndexOutOfBoundsException();
int len = ArrayUtils.idealCharArraySize(srclen + 1);
mText = new char[len];
mGapStart = srclen;
@@ -87,7 +89,7 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
if (en > end - start)
en = end - start;
setSpan(spans[i], st, en, fl);
setSpan(false, spans[i], st, en, fl);
}
}
}
@@ -149,7 +151,7 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
if (where == mGapStart)
return;
boolean atend = (where == length());
boolean atEnd = (where == length());
if (where < mGapStart) {
int overlap = mGapStart - where;
@@ -171,7 +173,7 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
else if (start == where) {
int flag = (mSpanFlags[i] & START_MASK) >> START_SHIFT;
if (flag == POINT || (atend && flag == PARAGRAPH))
if (flag == POINT || (atEnd && flag == PARAGRAPH))
start += mGapLength;
}
@@ -182,7 +184,7 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
else if (end == where) {
int flag = (mSpanFlags[i] & END_MASK);
if (flag == POINT || (atend && flag == PARAGRAPH))
if (flag == POINT || (atEnd && flag == PARAGRAPH))
end += mGapLength;
}
@@ -284,7 +286,7 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
}
if (st != ost || en != oen)
setSpan(mSpans[i], st, en, mSpanFlags[i]);
setSpan(false, mSpans[i], st, en, mSpanFlags[i]);
}
}
@@ -305,28 +307,6 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
TextUtils.getChars(tb, tbstart, tbend, mText, start);
if (tb instanceof Spanned) {
Spanned sp = (Spanned) tb;
Object[] spans = sp.getSpans(tbstart, tbend, Object.class);
for (int i = 0; i < spans.length; i++) {
int st = sp.getSpanStart(spans[i]);
int en = sp.getSpanEnd(spans[i]);
if (st < tbstart)
st = tbstart;
if (en > tbend)
en = tbend;
if (getSpanStart(spans[i]) < 0) {
setSpan(false, spans[i],
st - tbstart + start,
en - tbstart + start,
sp.getSpanFlags(spans[i]));
}
}
}
if (end > start) {
// no need for span fixup on pure insertion
boolean atEnd = (mGapStart + mGapLength == mText.length);
@@ -358,6 +338,25 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
}
}
}
if (tb instanceof Spanned) {
Spanned sp = (Spanned) tb;
Object[] spans = sp.getSpans(tbstart, tbend, Object.class);
for (int i = 0; i < spans.length; i++) {
int st = sp.getSpanStart(spans[i]);
int en = sp.getSpanEnd(spans[i]);
if (st < tbstart) st = tbstart;
if (en > tbend) en = tbend;
// Add span only if this object is not yet used as a span in this string
if (getSpanStart(spans[i]) < 0) {
setSpan(false, spans[i], st - tbstart + start, en - tbstart + start,
sp.getSpanFlags(spans[i]));
}
}
}
}
private void removeSpan(int i) {
@@ -389,7 +388,7 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
// Documentation from interface
public SpannableStringBuilder replace(final int start, final int end,
CharSequence tb, int tbstart, int tbend) {
CharSequence tb, int tbstart, int tbend) {
int filtercount = mFilters.length;
for (int i = 0; i < filtercount; i++) {
CharSequence repl = mFilters[i].filter(tb, tbstart, tbend, this, start, end);
@@ -411,53 +410,26 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
TextWatcher[] textWatchers = getSpans(start, start + origLen, TextWatcher.class);
sendBeforeTextChanged(textWatchers, start, origLen, newLen);
if (origLen == 0 || newLen == 0) {
change(start, end, tb, tbstart, tbend);
} else {
int selstart = Selection.getSelectionStart(this);
int selend = Selection.getSelectionEnd(this);
// Try to keep the cursor / selection at the same relative position during
// a text replacement. If replaced or replacement text length is zero, this
// is already taken care of.
boolean adjustSelection = origLen != 0 && newLen != 0;
int selstart = 0;
int selend = 0;
if (adjustSelection) {
selstart = Selection.getSelectionStart(this);
selend = Selection.getSelectionEnd(this);
}
// XXX just make the span fixups in change() do the right thing
// instead of this madness!
checkRange("replace", start, end);
checkRange("replace", start, end);
moveGapTo(end);
change(start, end, tb, tbstart, tbend);
if (mGapLength < 2)
resizeFor(length() + 1);
for (int i = mSpanCount - 1; i >= 0; i--) {
if (mSpanStarts[i] == mGapStart)
mSpanStarts[i]++;
if (mSpanEnds[i] == mGapStart)
mSpanEnds[i]++;
}
mText[mGapStart] = ' ';
mGapStart++;
mGapLength--;
if (mGapLength < 1) {
new Exception("mGapLength < 1").printStackTrace();
}
change(start + 1, start + 1, tb, tbstart, tbend);
change(start, start + 1, "", 0, 0);
change(start + newLen, start + newLen + origLen, "", 0, 0);
/*
* Special case to keep the cursor in the same position
* if it was somewhere in the middle of the replaced region.
* If it was at the start or the end or crossing the whole
* replacement, it should already be where it belongs.
* TODO: Is there some more general mechanism that could
* accomplish this?
*/
if (adjustSelection) {
if (selstart > start && selstart < end) {
long off = selstart - start;
off = off * newLen / (end - start);
off = off * newLen / origLen;
selstart = (int) off + start;
setSpan(false, Selection.SELECTION_START, selstart, selstart,
@@ -466,7 +438,7 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
if (selend > start && selend < end) {
long off = selend - start;
off = off * newLen / (end - start);
off = off * newLen / origLen;
selend = (int) off + start;
setSpan(false, Selection.SELECTION_END, selend, selend, Spanned.SPAN_POINT_POINT);
@@ -489,12 +461,10 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
}
private void setSpan(boolean send, Object what, int start, int end, int flags) {
int nstart = start;
int nend = end;
checkRange("setSpan", start, end);
if ((flags & START_MASK) == (PARAGRAPH << START_SHIFT)) {
int flagsStart = (flags & START_MASK) >> START_SHIFT;
if (flagsStart == PARAGRAPH) {
if (start != 0 && start != length()) {
char c = charAt(start - 1);
@@ -503,7 +473,8 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
}
}
if ((flags & END_MASK) == PARAGRAPH) {
int flagsEnd = flags & END_MASK;
if (flagsEnd == PARAGRAPH) {
if (end != 0 && end != length()) {
char c = charAt(end - 1);
@@ -512,26 +483,33 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
}
}
if (flags == Spanned.SPAN_EXCLUSIVE_EXCLUSIVE && start == end) {
throw new IllegalArgumentException(
"SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length");
// 0-length Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
if (flagsStart == POINT && flagsEnd == MARK && start == end) {
if (send) {
throw new IllegalArgumentException(
"SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length");
} else {
// Silently ignore invalid spans when they are created from this class.
// This avoids the duplication of the above test code before all the
// calls to setSpan that are done in this class
return;
}
}
int nstart = start;
int nend = end;
if (start > mGapStart) {
start += mGapLength;
} else if (start == mGapStart) {
int flag = (flags & START_MASK) >> START_SHIFT;
if (flag == POINT || (flag == PARAGRAPH && start == length()))
if (flagsStart == POINT || (flagsStart == PARAGRAPH && start == length()))
start += mGapLength;
}
if (end > mGapStart) {
end += mGapLength;
} else if (end == mGapStart) {
int flag = (flags & END_MASK);
if (flag == POINT || (flag == PARAGRAPH && end == length()))
if (flagsEnd == POINT || (flagsEnd == PARAGRAPH && end == length()))
end += mGapLength;
}
@@ -1231,6 +1209,7 @@ public class SpannableStringBuilder implements CharSequence, GetChars, Spannable
private int mSpanCount;
// TODO These value are tightly related to the public SPAN_MARK/POINT values in {@link Spanned}
private static final int MARK = 1;
private static final int POINT = 2;
private static final int PARAGRAPH = 3;