package com.glview.text;
import com.glview.R;
import com.glview.content.GLContext;
import com.glview.hwui.GLPaint;
public class TextUtils {
private TextUtils() { /* cannot be instantiated */ }
public static void getChars(CharSequence s, int start, int end,
char[] dest, int destoff) {
Class<? extends CharSequence> c = s.getClass();
if (c == String.class)
((String) s).getChars(start, end, dest, destoff);
else if (c == StringBuffer.class)
((StringBuffer) s).getChars(start, end, dest, destoff);
else if (c == StringBuilder.class)
((StringBuilder) s).getChars(start, end, dest, destoff);
else {
for (int i = start; i < end; i++)
dest[destoff++] = s.charAt(i);
}
}
/**
* Returns true if the string is null or 0-length.
* @param str the string to be examined
* @return true if str is null or zero length
*/
public static boolean isEmpty(CharSequence str) {
if (str == null || str.length() == 0)
return true;
else
return false;
}
public static int indexOf(CharSequence s, char ch) {
return indexOf(s, ch, 0);
}
public static int indexOf(CharSequence s, char ch, int start) {
Class<? extends CharSequence> c = s.getClass();
if (c == String.class)
return ((String) s).indexOf(ch, start);
return indexOf(s, ch, start, s.length());
}
public static int indexOf(CharSequence s, char ch, int start, int end) {
Class<? extends CharSequence> c = s.getClass();
if (s instanceof GetChars || c == StringBuffer.class ||
c == StringBuilder.class || c == String.class) {
final int INDEX_INCREMENT = 500;
char[] temp = obtain(INDEX_INCREMENT);
while (start < end) {
int segend = start + INDEX_INCREMENT;
if (segend > end)
segend = end;
getChars(s, start, segend, temp, 0);
int count = segend - start;
for (int i = 0; i < count; i++) {
if (temp[i] == ch) {
recycle(temp);
return i + start;
}
}
start = segend;
}
recycle(temp);
return -1;
}
for (int i = start; i < end; i++)
if (s.charAt(i) == ch)
return i;
return -1;
}
public static int lastIndexOf(CharSequence s, char ch) {
return lastIndexOf(s, ch, s.length() - 1);
}
public static int lastIndexOf(CharSequence s, char ch, int last) {
Class<? extends CharSequence> c = s.getClass();
if (c == String.class)
return ((String) s).lastIndexOf(ch, last);
return lastIndexOf(s, ch, 0, last);
}
public static int lastIndexOf(CharSequence s, char ch,
int start, int last) {
if (last < 0)
return -1;
if (last >= s.length())
last = s.length() - 1;
int end = last + 1;
Class<? extends CharSequence> c = s.getClass();
if (s instanceof GetChars || c == StringBuffer.class ||
c == StringBuilder.class || c == String.class) {
final int INDEX_INCREMENT = 500;
char[] temp = obtain(INDEX_INCREMENT);
while (start < end) {
int segstart = end - INDEX_INCREMENT;
if (segstart < start)
segstart = start;
getChars(s, segstart, end, temp, 0);
int count = end - segstart;
for (int i = count - 1; i >= 0; i--) {
if (temp[i] == ch) {
recycle(temp);
return i + segstart;
}
}
end = segstart;
}
recycle(temp);
return -1;
}
for (int i = end - 1; i >= start; i--)
if (s.charAt(i) == ch)
return i;
return -1;
}
public static int indexOf(CharSequence s, CharSequence needle) {
return indexOf(s, needle, 0, s.length());
}
public static int indexOf(CharSequence s, CharSequence needle, int start) {
return indexOf(s, needle, start, s.length());
}
public static int indexOf(CharSequence s, CharSequence needle,
int start, int end) {
int nlen = needle.length();
if (nlen == 0)
return start;
char c = needle.charAt(0);
for (;;) {
start = indexOf(s, c, start);
if (start > end - nlen) {
break;
}
if (start < 0) {
return -1;
}
if (regionMatches(s, start, needle, 0, nlen)) {
return start;
}
start++;
}
return -1;
}
public static boolean regionMatches(CharSequence one, int toffset,
CharSequence two, int ooffset,
int len) {
int tempLen = 2 * len;
if (tempLen < len) {
// Integer overflow; len is unreasonably large
throw new IndexOutOfBoundsException();
}
char[] temp = obtain(tempLen);
getChars(one, toffset, toffset + len, temp, 0);
getChars(two, ooffset, ooffset + len, temp, len);
boolean match = true;
for (int i = 0; i < len; i++) {
if (temp[i] != temp[i + len]) {
match = false;
break;
}
}
recycle(temp);
return match;
}
public enum TruncateAt {
START,
MIDDLE,
END,
MARQUEE,
/**
* @hide
*/
END_SMALL
}
public interface EllipsizeCallback {
/**
* This method is called to report that the specified region of
* text was ellipsized away by a call to {@link #ellipsize}.
*/
public void ellipsized(int start, int end);
}
/**
* Returns the original text if it fits in the specified width
* given the properties of the specified Paint,
* or, if it does not fit, a truncated
* copy with ellipsis character added at the specified edge or center.
*/
public static CharSequence ellipsize(CharSequence text,
GLPaint p,
float avail, TruncateAt where) {
return ellipsize(text, p, avail, where, false, null);
}
/**
* Returns the original text if it fits in the specified width
* given the properties of the specified Paint,
* or, if it does not fit, a copy with ellipsis character added
* at the specified edge or center.
* If <code>preserveLength</code> is specified, the returned copy
* will be padded with zero-width spaces to preserve the original
* length and offsets instead of truncating.
* If <code>callback</code> is non-null, it will be called to
* report the start and end of the ellipsized range. TextDirection
* is determined by the first strong directional character.
*/
public static CharSequence ellipsize(CharSequence text,
GLPaint paint,
float avail, TruncateAt where,
boolean preserveLength,
EllipsizeCallback callback) {
final String ellipsis = (where == TruncateAt.END_SMALL) ?
GLContext.get().getApplicationContext().getString(R.string.ellipsis_two_dots) :
GLContext.get().getApplicationContext().getString(R.string.ellipsis);
return ellipsize(text, paint, avail, where, preserveLength, callback,
TextDirectionHeuristics.FIRSTSTRONG_LTR, ellipsis);
}
/**
* Returns the original text if it fits in the specified width
* given the properties of the specified Paint,
* or, if it does not fit, a copy with ellipsis character added
* at the specified edge or center.
* If <code>preserveLength</code> is specified, the returned copy
* will be padded with zero-width spaces to preserve the original
* length and offsets instead of truncating.
* If <code>callback</code> is non-null, it will be called to
* report the start and end of the ellipsized range.
*
* @hide
*/
public static CharSequence ellipsize(CharSequence text,
GLPaint paint,
float avail, TruncateAt where,
boolean preserveLength,
EllipsizeCallback callback,
TextDirectionHeuristic textDir, String ellipsis) {
int len = text.length();
MeasuredText mt = MeasuredText.obtain();
try {
mt.setPara(text, 0, len, textDir);
float width = mt.addStyleRun(paint, len, null);
if (width <= avail) {
if (callback != null) {
callback.ellipsized(0, 0);
}
return text;
}
// XXX assumes ellipsis string does not require shaping and
// is unaffected by style
float ellipsiswid = paint.measureText(ellipsis);
avail -= ellipsiswid;
int left = 0;
int right = len;
if (avail < 0) {
// it all goes
} else if (where == TruncateAt.START) {
right = len - mt.breakText(len, false, avail);
} else if (where == TruncateAt.END || where == TruncateAt.END_SMALL) {
left = mt.breakText(len, true, avail);
} else {
right = len - mt.breakText(len, false, avail / 2);
avail -= mt.measure(right, len);
left = mt.breakText(right, true, avail);
}
if (callback != null) {
callback.ellipsized(left, right);
}
char[] buf = mt.mChars;
int remaining = len - (right - left);
if (preserveLength) {
if (remaining > 0) { // else eliminate the ellipsis too
buf[left++] = ellipsis.charAt(0);
}
for (int i = left; i < right; i++) {
buf[i] = ZWNBS_CHAR;
}
String s = new String(buf, 0, len);
return s;
}
if (remaining == 0) {
return "";
}
StringBuilder sb = new StringBuilder(remaining + ellipsis.length());
sb.append(buf, 0, left);
sb.append(ellipsis);
sb.append(buf, right, len - right);
return sb.toString();
} finally {
MeasuredText.recycle(mt);
}
}
/* package */ static char[] obtain(int len) {
char[] buf;
synchronized (sLock) {
buf = sTemp;
sTemp = null;
}
if (buf == null || buf.length < len)
buf = new char[len];
return buf;
}
/* package */ static void recycle(char[] temp) {
if (temp.length > 1000)
return;
synchronized (sLock) {
sTemp = temp;
}
}
private static Object sLock = new Object();
private static char[] sTemp = null;
private static final char ZWNBS_CHAR = '\uFEFF';
/**
* For the purpose of layout, a word break is a boundary with no
* kerning or complex script processing. This is necessarily a
* heuristic, but should be accurate most of the time.
*/
public static boolean isWordBreak(char c) {
if (isSpace(c)) {
// spaces
return true;
}
if ((c >= 0x3400 && c <= 0x9fff)) {
// CJK ideographs (and yijing hexagram symbols)
return true;
}
// Note: kana is not included, as sophisticated fonts may kern kana
return false;
}
public static boolean isSpace(char c) {
if (c == ' ' || (c >= 0x2000 && c <= 0x200a) || c == 0x3000) {
// spaces
return true;
}
return false;
}
}