public ICharSequence FilterFormatted(ICharSequence source, int start, int end, ISpanned dest, int dstart, int dend)
{
if (source is SpannableStringBuilder)
{
var sourceAsSpannableBuilder = (SpannableStringBuilder)source;
for (var i = end - 1; i >= start; i--)
{
if (!isCharacterOk(source.CharAt(i)))
{
sourceAsSpannableBuilder.Delete(i, i + 1);
}
}
return(sourceAsSpannableBuilder);
}
else
{
var filteredStringBuilder = new SpannableStringBuilder();
for (int i = start; i < end; i++)
{
var currentChar = source.CharAt(i);
if (isCharacterOk(currentChar))
{
filteredStringBuilder.Append(currentChar);
}
}
return(filteredStringBuilder);
}
}
public ICharSequence FilterFormatted(ICharSequence source, int start, int end, ISpanned dest, int dstart, int dend)
{
for (int i = start; i < end; ++i)
{
if (!Character.IsDigit(source.CharAt(i)) && !backgroundHintTextView.IsCharInFilter(source.CharAt(i)))
{
return new Java.Lang.String("");
}
}
return null;
}
public ICharSequence FilterFormatted(ICharSequence source, int start, int end, ISpanned dest, int dstart, int dend)
{
StringBuilder sb = new StringBuilder();
for (int i = start; i < end; i++)
{
if ((Character.IsDigit(source.CharAt(i)) || source.CharAt(i) == '-'))
{
sb.Append(source.CharAt(i));
}
}
return((sb.Length() == (end - start)) ? null : new Java.Lang.String(sb.ToString()));
}
public int FindTokenStart(ICharSequence text, int cursor)
{
int i = cursor;
while (i > 0 && !SplitChar.Contains(text.CharAt(i - 1)))
{
i--;
}
while (i < cursor && text.CharAt(i) == ' ')
{
i++;
}
return i;
}
private bool Equals(ICharSequence text1, char[] text2)
{
int len = text1.Length;
if (len != text2.Length)
{
return(false);
}
if (ignoreCase)
{
for (int i = 0; i < len;)
{
int codePointAt = charUtils.CodePointAt(text1, i);
if (char.ToLower((char)codePointAt) != charUtils.CodePointAt(text2, i, text2.Length))
{
return(false);
}
i += Character.CharCount(codePointAt);
}
}
else
{
for (int i = 0; i < len; i++)
{
if (text1.CharAt(i) != text2[i])
{
return(false);
}
}
}
return(true);
}
/// <summary>
/// Find the start of the Token
/// </summary>
public int FindTokenStart(ICharSequence text, int cursor)
{
int i = cursor;
// Moved i, untill it hits a space, first going back, the going forward
while (i > 0 && text.CharAt(i - 1) != ' ')
{
i--;
}
while (i < cursor && text.CharAt(i) == ' ')
{
i++;
}
return i;
}
public ICharSequence FilterFormatted(ICharSequence source, int start, int end, ISpanned dest, int dstart, int dend)
{
var empty = string.Empty.AsJavaString();
var sourceLength = source.Length();
if (sourceLength > 1)
{
return(source.ToString().AsJavaString());
}
if (sourceLength == 0)
{
onDeletionDetected();
return("0".AsCharSequence());
}
var lastChar = source.CharAt(sourceLength - 1);
if (char.IsDigit(lastChar))
{
int digit = int.Parse(lastChar.ToString());
onDigitEntered(digit);
return(empty);
}
return(empty);
}
public void Concat(ICharSequence other)
{
for (int i = 0; i < other.Length; i++)
{
_list.Add(other.CharAt(i));
}
}
public static int CodePointAt(ICharSequence seq, int index)
{
char c1 = seq.CharAt(index++);
if (char.IsHighSurrogate(c1))
{
if (index < seq.Length)
{
char c2 = seq.CharAt(index);
if (char.IsLowSurrogate(c2))
{
return(ToCodePoint(c1, c2));
}
}
}
return(c1);
}
public CharBlockArray Append(ICharSequence chars, int start, int length)
{
int end = start + length;
for (int i = start; i < end; i++)
{
Append(chars.CharAt(i));
}
return(this);
}
public ICharSequence FilterFormatted(ICharSequence source, int start, int end, ISpanned dest, int dstart, int dend)
{
for (int i = start; i < end; ++i)
{
if (!Character.IsDigit(source.CharAt(i)) && !backgroundHintTextView.IsCharInFilter(source.CharAt(i)))
{
return(new Java.Lang.String(""));
}
}
return(null);
}
public ICharSequence FilterFormatted(ICharSequence source, int start, int end, ISpanned dest, int dstart, int dend)
{
for (int i = start; i < end; i++)
{
int type = Character.GetType(source.CharAt(i));
if (type == Character.Surrogate || type == Character.OtherSymbol)
{
return(emptyString);
}
}
return(null);
}
private int[] BuildNext(ICharSequence pattern)
{
int j = 0;
int m = pattern.Length;
int[] res = new int[m];
int t = res[0] = -1;
while (j < m - 1)
{
if (0 > t || pattern.CharAt(j) == pattern.CharAt(t))
{
j++;
t++;
res[j] = t;
}
else
{
t = res[t];
}
}
return(res);
}
public bool Equals(ICharSequence other)
{
if (other.Length != Length)
{
return(false);
}
for (int i = 0; i < Length; i++)
{
if (other.CharAt(i) != CharAt(i))
{
return(false);
}
}
return(true);
}
public int FindTokenEnd(ICharSequence text, int cursor)
{
int i = cursor;
int len = text.Length();
while (i < len)
{
if (SplitChar.Contains(text.CharAt(i)))
{
return i;
}
else
{
i++;
}
}
return len;
}
public ICharSequence FilterFormatted(ICharSequence source, int start, int end, ISpanned dest, int dstart, int dend)
{
if (source != null && source.Length() > 0)
{
var includesInvalidCharacter = false;
var destLength = dend - dstart + 1;
var adjustStart = source.Length() - destLength;
var sb = new StringBuilder(end - start);
for (var i = start; i < end; i++)
{
var c = source.CharAt(i);
if (IsCharAllowed(c))
{
if (i >= adjustStart)
{
sb.Append(source, i, i + 1);
}
}
else
{
includesInvalidCharacter = true;
}
}
if (!includesInvalidCharacter)
{
return(null);
}
if (source is ISpanned spanned)
{
var sp = new SpannableString(sb);
TextUtils.CopySpansFrom(spanned, start, sb.Length(), null, sp, 0);
return(sp);
}
return(sb);
}
return(null);
}
/// <summary>
/// Find the end of the Token
/// </summary>
public int FindTokenEnd(ICharSequence text, int cursor)
{
int i = cursor;
int len = text.Length();
while (i < len)
{
// If a space is hit, then the token has ended
if (text.CharAt(i) == ' ')
{
return i;
}
else
{
i++;
}
}
return len;
}
public ICharSequence FilterFormatted(ICharSequence source, int start, int end,
ISpanned dest, int dstart, int dend)
{
if (_editor.Modified &&
end - start == 1 &&
start < source.Length() &&
dstart < dest.Length())
{
char c = source.CharAt(start);
if (c == '\n')
{
return(_editor.AutoIndent(
source,
dest,
dstart,
dend));
}
}
return(source);
}
private int Match(ICharSequence pattern)
{
int[] next = BuildNext(pattern);
int i = 0;
int j = 0;
int m = pattern.Length;
int n = Length;
while (j < m && i < n)
{
if (0 > j || CharAt(i) == pattern.CharAt(j))
{
i++;
j++;
}
else
{
j = next[j];
}
}
return(i - j);
}
private static ISpanned RemoveTrailingNewLines(ICharSequence text)
{
var builder = new SpannableStringBuilder(text);
var count = 0;
for (int i = 1; i <= text.Length(); i++)
{
if (!'\n'.Equals(text.CharAt(text.Length() - i)))
{
break;
}
count++;
}
if (count > 0)
{
_ = builder.Delete(text.Length() - count, text.Length());
}
return(builder);
}
public ICharSequence TerminateTokenFormatted(ICharSequence text)
{
int i = text.Length();
while (i > 0 && text.CharAt(i - 1) == ' ') {
i--;
}
if (i > 0 && SplitChar.Contains(text.CharAt(i - 1))) {
return text;
} else {
// Try not to use a space as a token character
var token = (SplitChar.Count > 1 && SplitChar[0] == ' ' ? SplitChar[1] : SplitChar[0]) + " ";
if (text is ISpanned) {
SpannableString sp = new SpannableString(text + token);
TextUtils.CopySpansFrom((ISpanned)text, 0, text.Length(), null, sp, 0);
return sp;
} else {
return (text + token).ToAndroidString();
}
}
}
public override ICharSequence FilterFormatted(ICharSequence source, int start, int end, ISpanned dest, int dstart,
int dend)
{
// Borrowed heavily from the Android source
ICharSequence filterFormatted = base.FilterFormatted(source, start, end, dest, dstart, dend);
if (filterFormatted != null)
{
source = filterFormatted;
start = 0;
end = filterFormatted.Length();
}
int sign = -1;
int dec = -1;
int dlen = dest.Length();
// Find out if the existing text has a sign or decimal point characters.
for (var i = 0; i < dstart; i++)
{
char c = dest.CharAt(i);
if (IsSignChar(c))
{
sign = i;
}
else if (IsDecimalPointChar(c))
{
dec = i;
}
}
for (int i = dend; i < dlen; i++)
{
char c = dest.CharAt(i);
if (IsSignChar(c))
{
return(new String("")); // Nothing can be inserted in front of a sign character.
}
if (IsDecimalPointChar(c))
{
dec = i;
}
}
// If it does, we must strip them out from the source.
// In addition, a sign character must be the very first character,
// and nothing can be inserted before an existing sign character.
// Go in reverse order so the offsets are stable.
SpannableStringBuilder stripped = null;
for (int i = end - 1; i >= start; i--)
{
char c = source.CharAt(i);
var strip = false;
if (IsSignChar(c))
{
if (i != start || dstart != 0)
{
strip = true;
}
else if (sign >= 0)
{
strip = true;
}
else
{
sign = i;
}
}
else if (IsDecimalPointChar(c))
{
if (dec >= 0)
{
strip = true;
}
else
{
dec = i;
}
}
if (strip)
{
if (end == start + 1)
{
return(new String("")); // Only one character, and it was stripped.
}
if (stripped == null)
{
stripped = new SpannableStringBuilder(source, start, end);
}
stripped.Delete(i - start, i + 1 - start);
}
}
return(stripped ?? filterFormatted);
}
public override int CodePointAt(ICharSequence seq, int offset)
{
return(seq.CharAt(offset));
}
public void TestLength()
{
Assert.AreEqual(7, _sequece.Length);
Assert.AreEqual('g', _sequece.CharAt(0));
}
public static int CodePointAt(ICharSequence seq, int index)
{
char c1 = seq.CharAt(index++);
if (char.IsHighSurrogate(c1))
{
if (index < seq.Length)
{
char c2 = seq.CharAt(index);
if (char.IsLowSurrogate(c2))
{
return ToCodePoint(c1, c2);
}
}
}
return c1;
}
/**
* 计算分享内容的字数，一个汉字=两个英文字母，一个中文标点=两个英文标点 注意：该函数的不适用于对单个字符进行计算，因为单个字符四舍五入后都是1
*
* @param c
* @return
*/
private long calculateLength(ICharSequence c)
{
double len = 0;
for (var i = 0; i < c.Length(); i++)
{
var tmp = (int)c.CharAt(i);
if (tmp >= 0x4e00 && tmp <= 0x9fbb)//中文
{
len += 2;
}
else
{
len += 1;
}
//if (tmp > 0 && tmp < 127)
//{
// len += 0.5;
//}
//else
//{
// len++;
//}
}
return (long)System.Math.Round(len);
}
public static ICharSequence replaceEmoji(ICharSequence cs, Paint.FontMetricsInt fontMetrics, int size)
{
if (cs == null || cs.Length() == 0)
{
return(cs);
}
ISpannable s;
if (cs is ISpannable)
{
s = (ISpannable)cs;
}
else
{
s = SpannableFactory.Instance.NewSpannable(cs);
}
ulong buf = 0;
int emojiCount = 0;
try
{
for (int i = 0; i < cs.Length(); i++)
{
char c = cs.CharAt(i);
if (c == 0xD83C || c == 0xD83D || (buf != 0 && (buf & 0xFFFFFFFF00000000L) == 0 && (c >= 0xDDE6 && c <= 0xDDFA)))
{
buf <<= 16;
buf |= c;
}
else if (buf > 0 && (c & 0xF000) == 0xD000)
{
buf <<= 16;
buf |= c;
EmojiDrawable d = Emoji.getEmojiDrawable(buf);
if (d != null)
{
var span = new EmojiSpan(d, (int)SpanAlign.Bottom, size, fontMetrics);
emojiCount++;
if (c >= 0xDDE6 && c <= 0xDDFA)
{
s.SetSpan(span, i - 3, i + 1, 0);
}
else
{
s.SetSpan(span, i - 1, i + 1, 0);
}
}
buf = 0;
}
else if (c == 0x20E3)
{
if (i > 0)
{
char c2 = cs.CharAt(i - 1);
if ((c2 >= '0' && c2 <= '9') || c2 == '#')
{
buf = c2;
buf <<= 16;
buf |= c;
EmojiDrawable d = Emoji.getEmojiDrawable(buf);
if (d != null)
{
EmojiSpan span = new EmojiSpan(d, (int)SpanAlign.Bottom, size, fontMetrics);
emojiCount++;
s.SetSpan(span, i - 1, i + 1, 0);
}
buf = 0;
}
}
}
else if (inArray(c, emojiChars) == Java.Lang.Boolean.True)
{
EmojiDrawable d = Emoji.getEmojiDrawable(c);
if (d != null)
{
EmojiSpan span = new EmojiSpan(d, (int)SpanAlign.Bottom, size, fontMetrics);
emojiCount++;
s.SetSpan(span, i, i + 1, 0);
}
}
if (emojiCount >= 50)
{
break;
}
}
}
catch (Java.Lang.Exception e)
{
//FileLog.e("tmessages", e);
return(cs);
}
return(s);
}
/// <summary>
/// A method for getting tokens containing mutible words
/// </summary>
private ICharSequence InnerToken(ICharSequence text)
{
int i = text.Length();
// Find the first space in the Token, going backwards
while (i > 0 && text.CharAt(i - 1) == ' ')
{
i--;
}
if (i > 0 && text.CharAt(i - 1) == ' ')
{
return text;
}
else
{
if (text.GetType().IsInstanceOfType(typeof(ISpanned)))
{
SpannableString sp = new SpannableString(text + " ");
TextUtils.CopySpansFrom((ISpanned)text, 0, text.Length(), Java.Lang.Class.FromType(typeof(Java.Lang.Object)), sp, 0);
return sp;
}
else
{
return new Java.Lang.String(text + " ");
}
}
}
public override int CodePointAt(ICharSequence seq, int offset)
{
return seq.CharAt(offset);
}
public CharBlockArray Append(ICharSequence chars, int start, int length)
{
int end = start + length;
for (int i = start; i < end; i++)
{
Append(chars.CharAt(i));
}
return this;
}
