private static void GetValues(char trieWord, StringPrep.Values values)
{
values.Reset();
if (trieWord == 0)
{
/*
* Initial value stored in the mapping table just return TYPE_LIMIT
* .. so that the source codepoint is copied to the destination
*/
values.type = TYPE_LIMIT;
}
else if (trieWord >= TYPE_THRESHOLD)
{
values.type = (trieWord - TYPE_THRESHOLD);
}
else
{
/* get the type */
values.type = MAP;
/* ascertain if the value is index or delta */
if ((trieWord & 0x02) > 0)
{
values.isIndex = true;
values.value_ren = trieWord >> 2; // mask off the lower 2 bits and
// shift
}
else
{
values.isIndex = false;
values.value_ren = ((int)(trieWord << 16)) >> 16;
values.value_ren = (values.value_ren >> 2);
}
if ((trieWord >> 2) == MAX_INDEX_VALUE)
{
values.type = DELETE;
values.isIndex = false;
values.value_ren = 0;
}
}
}
/*
* boolean isLabelSeparator(int ch){ int result = getCodePointValue(ch); if(
* (result & 0x07) == LABEL_SEPARATOR){ return true; } return false; }
*/
/*
* 1) Map -- For each character in the input, check if it has a mapping and,
* if so, replace it with its mapping.
*
* 2) Normalize -- Possibly normalize the result of step 1 using Unicode
* normalization.
*
* 3) Prohibit -- Check for any characters that are not allowed in the
* output. If any are found, return an error.
*
* 4) Check bidi -- Possibly check for right-to-left characters, and if any
* are found, make sure that the whole string satisfies the requirements for
* bidirectional strings. If the string does not satisfy the requirements
* for bidirectional strings, return an error. [Unicode3.2] defines several
* bidirectional categories; each character has one bidirectional category
* assigned to it. For the purposes of the requirements below, an
* "RandALCat character" is a character that has Unicode bidirectional
* categories "R" or "AL"; an "LCat character" is a character that has
* Unicode bidirectional category "L". Note
*
*
* that there are many characters which fall in neither of the above
* definitions; Latin digits (<U+0030> through <U+0039>) are examples of
* this because they have bidirectional category "EN".
*
* In any profile that specifies bidirectional character handling, all three
* of the following requirements MUST be met:
*
* 1) The characters in section 5.8 MUST be prohibited.
*
* 2) If a string contains any RandALCat character, the string MUST NOT
* contain any LCat character.
*
* 3) If a string contains any RandALCat character, a RandALCat character
* MUST be the first character of the string, and a RandALCat character MUST
* be the last character of the string.
*/
/// <summary>
/// Prepare the input buffer for use in applications with the given profile.
/// This operation maps, normalizes(NFKC), checks for prohited and BiDi
/// characters in the order defined by RFC 3454 depending on the options
/// specified in the profile.
/// </summary>
///
/// <param name="src">A UCharacterIterator object containing the source string</param>
/// <param name="options">A bit set of options:- StringPrep.NONE Prohibit processing of unassigned codepoints in the input- StringPrep.ALLOW_UNASSIGNED Treat the unassigned code pointsare in the input as normal Unicode code points.</param>
/// <returns>StringBuffer A StringBuffer containing the output</returns>
/// <exception cref="ParseException"></exception>
/// @stable ICU 2.8
public StringBuilder Prepare(UCharacterIterator src, int options)
{
// map
StringBuilder mapOut = Map(src, options);
StringBuilder normOut = mapOut; // initialize
if (doNFKC)
{
// normalize
normOut = Normalize(mapOut);
}
int ch;
char result;
UCharacterIterator iter = IBM.ICU.Text.UCharacterIterator.GetInstance(normOut);
StringPrep.Values val = new StringPrep.Values();
int direction = IBM.ICU.Lang.UCharacterEnums.ECharacterDirection.CHAR_DIRECTION_COUNT, firstCharDir = IBM.ICU.Lang.UCharacterEnums.ECharacterDirection.CHAR_DIRECTION_COUNT;
int rtlPos = -1, ltrPos = -1;
bool rightToLeft = false, leftToRight = false;
while ((ch = iter.NextCodePoint()) != IBM.ICU.Text.UForwardCharacterIterator_Constants.DONE)
{
result = GetCodePointValue(ch);
GetValues(result, val);
if (val.type == PROHIBITED)
{
throw new StringPrepParseException(
"A prohibited code point was found in the input",
IBM.ICU.Text.StringPrepParseException.PROHIBITED_ERROR,
iter.GetText(), val.value_ren);
}
if (checkBiDi)
{
direction = bdp.GetClass(ch);
if (firstCharDir == IBM.ICU.Lang.UCharacterEnums.ECharacterDirection.CHAR_DIRECTION_COUNT)
{
firstCharDir = direction;
}
if (direction == IBM.ICU.Lang.UCharacterEnums.ECharacterDirection.LEFT_TO_RIGHT)
{
leftToRight = true;
ltrPos = iter.GetIndex() - 1;
}
if (direction == IBM.ICU.Lang.UCharacterEnums.ECharacterDirection.RIGHT_TO_LEFT ||
direction == IBM.ICU.Lang.UCharacterEnums.ECharacterDirection.RIGHT_TO_LEFT_ARABIC)
{
rightToLeft = true;
rtlPos = iter.GetIndex() - 1;
}
}
}
if (checkBiDi == true)
{
// satisfy 2
if (leftToRight == true && rightToLeft == true)
{
throw new StringPrepParseException(
"The input does not conform to the rules for BiDi code points.",
IBM.ICU.Text.StringPrepParseException.CHECK_BIDI_ERROR, iter
.GetText(), (rtlPos > ltrPos) ? rtlPos : ltrPos);
}
// satisfy 3
if (rightToLeft == true &&
!((firstCharDir == IBM.ICU.Lang.UCharacterEnums.ECharacterDirection.RIGHT_TO_LEFT || firstCharDir == IBM.ICU.Lang.UCharacterEnums.ECharacterDirection.RIGHT_TO_LEFT_ARABIC) && (direction == IBM.ICU.Lang.UCharacterEnums.ECharacterDirection.RIGHT_TO_LEFT || direction == IBM.ICU.Lang.UCharacterEnums.ECharacterDirection.RIGHT_TO_LEFT_ARABIC)))
{
throw new StringPrepParseException(
"The input does not conform to the rules for BiDi code points.",
IBM.ICU.Text.StringPrepParseException.CHECK_BIDI_ERROR, iter
.GetText(), (rtlPos > ltrPos) ? rtlPos : ltrPos);
}
}
return(normOut);
}
private StringBuilder Map(UCharacterIterator iter, int options)
{
StringPrep.Values val = new StringPrep.Values();
char result = (char)(0);
int ch = IBM.ICU.Text.UForwardCharacterIterator_Constants.DONE;
StringBuilder dest = new StringBuilder();
bool allowUnassigned = ((options & ALLOW_UNASSIGNED) > 0);
while ((ch = iter.NextCodePoint()) != IBM.ICU.Text.UForwardCharacterIterator_Constants.DONE)
{
result = GetCodePointValue(ch);
GetValues(result, val);
// check if the source codepoint is unassigned
if (val.type == UNASSIGNED && allowUnassigned == false)
{
throw new StringPrepParseException(
"An unassigned code point was found in the input",
IBM.ICU.Text.StringPrepParseException.UNASSIGNED_ERROR,
iter.GetText(), iter.GetIndex());
}
else if ((val.type == MAP))
{
int index, length;
if (val.isIndex)
{
index = val.value_ren;
if (index >= indexes[ONE_UCHAR_MAPPING_INDEX_START] &&
index < indexes[TWO_UCHARS_MAPPING_INDEX_START])
{
length = 1;
}
else if (index >= indexes[TWO_UCHARS_MAPPING_INDEX_START] &&
index < indexes[THREE_UCHARS_MAPPING_INDEX_START])
{
length = 2;
}
else if (index >= indexes[THREE_UCHARS_MAPPING_INDEX_START] &&
index < indexes[FOUR_UCHARS_MAPPING_INDEX_START])
{
length = 3;
}
else
{
length = mappingData[index++];
}
/* copy mapping to destination */
dest.Append(mappingData, index, length);
continue;
}
else
{
ch -= val.value_ren;
}
}
else if (val.type == DELETE)
{
// just consume the codepoint and contine
continue;
}
// copy the source into destination
IBM.ICU.Text.UTF16.Append(dest, ch);
}
return(dest);
}