1364 lines
45 KiB
C++
1364 lines
45 KiB
C++
/*
|
|
**********************************************************************
|
|
* Copyright (C) 1999-2001, International Business Machines
|
|
* Corporation and others. All Rights Reserved.
|
|
**********************************************************************
|
|
* Date Name Description
|
|
* 10/20/99 alan Creation.
|
|
**********************************************************************
|
|
*/
|
|
|
|
#include "unicode/uniset.h"
|
|
#include "unicode/parsepos.h"
|
|
#include "unicode/unicode.h"
|
|
#include "symtable.h"
|
|
#include "cmemory.h"
|
|
#include "rbt_rule.h"
|
|
|
|
#ifndef HPUX
|
|
const UChar32 UnicodeSet::HIGH= 0x0110000; // HIGH_VALUE > all valid values. 110000 for codepoints
|
|
#else
|
|
# define HIGH (0x0110000)
|
|
#endif
|
|
const UChar32 UnicodeSet::LOW = 0x000000; // LOW <= all valid values. ZERO for codepoints
|
|
|
|
|
|
/**
|
|
* Minimum value that can be stored in a UnicodeSet.
|
|
*/
|
|
const UChar32 UnicodeSet::MIN_VALUE = UnicodeSet::LOW;
|
|
|
|
/**
|
|
* Maximum value that can be stored in a UnicodeSet.
|
|
*/
|
|
const UChar32 UnicodeSet::MAX_VALUE = HIGH - 1;
|
|
|
|
const int32_t UnicodeSet::START_EXTRA = 16; // initial storage. Must be >= 0
|
|
const int32_t UnicodeSet::GROW_EXTRA = START_EXTRA; // extra amount for growth. Must be >= 0
|
|
|
|
// N.B.: This mapping is different in ICU and Java
|
|
const UnicodeString UnicodeSet::CATEGORY_NAMES(
|
|
"CnLuLlLtLmLoMnMeMcNdNlNoZsZlZpCcCfCoCsPdPsPePcPoSmScSkSoPiPf", "");
|
|
|
|
/**
|
|
* A cache mapping character category integers, as returned by
|
|
* Unicode::getType(), to pairs strings. Entries are initially
|
|
* zero length and are filled in on demand.
|
|
*/
|
|
UnicodeSet _CATEGORY_CACHE[Unicode::GENERAL_TYPES_COUNT];
|
|
UnicodeSet* UnicodeSet::CATEGORY_CACHE = _CATEGORY_CACHE;
|
|
|
|
/**
|
|
* Delimiter string used in patterns to close a category reference:
|
|
* ":]". Example: "[:Lu:]".
|
|
*/
|
|
const UChar UnicodeSet::CATEGORY_CLOSE[] = {0x003A, 0x005D, 0x0000}; /* :] */
|
|
|
|
// Define UChar constants using hex for EBCDIC compatibility
|
|
const UChar UnicodeSet::SET_OPEN = 0x005B; /*[*/
|
|
const UChar UnicodeSet::SET_CLOSE = 0x005D; /*]*/
|
|
const UChar UnicodeSet::HYPHEN = 0x002D; /*-*/
|
|
const UChar UnicodeSet::COMPLEMENT = 0x005E; /*^*/
|
|
const UChar UnicodeSet::COLON = 0x003A; /*:*/
|
|
const UChar UnicodeSet::BACKSLASH = 0x005C; /*\*/
|
|
const UChar UnicodeSet::INTERSECTION = 0x0026; /*&*/
|
|
const UChar UnicodeSet::UPPER_U = 0x0055; /*U*/
|
|
|
|
//----------------------------------------------------------------
|
|
// Constructors &c
|
|
//----------------------------------------------------------------
|
|
|
|
/**
|
|
* Constructs an empty set.
|
|
*/
|
|
UnicodeSet::UnicodeSet() :
|
|
len(1), capacity(1 + START_EXTRA), bufferCapacity(0),
|
|
buffer(0)
|
|
{
|
|
list = new UChar32[capacity];
|
|
list[0] = HIGH;
|
|
}
|
|
|
|
/**
|
|
* Constructs a set containing the given range. If <code>end >
|
|
* start</code> then an empty set is created.
|
|
*
|
|
* @param start first character, inclusive, of range
|
|
* @param end last character, inclusive, of range
|
|
*/
|
|
UnicodeSet::UnicodeSet(UChar32 start, UChar32 end) :
|
|
len(1), capacity(1 + START_EXTRA), bufferCapacity(0),
|
|
buffer(0)
|
|
{
|
|
list = new UChar32[capacity];
|
|
list[0] = HIGH;
|
|
complement(start, end);
|
|
}
|
|
|
|
/**
|
|
* Constructs a set from the given pattern, optionally ignoring
|
|
* white space. See the class description for the syntax of the
|
|
* pattern language.
|
|
* @param pattern a string specifying what characters are in the set
|
|
*/
|
|
UnicodeSet::UnicodeSet(const UnicodeString& pattern,
|
|
UErrorCode& status) :
|
|
len(0), capacity(START_EXTRA), bufferCapacity(0),
|
|
buffer(0)
|
|
{
|
|
list = new UChar32[capacity];
|
|
applyPattern(pattern, status);
|
|
}
|
|
|
|
// For internal use by RuleBasedTransliterator
|
|
UnicodeSet::UnicodeSet(const UnicodeString& pattern, ParsePosition& pos,
|
|
const SymbolTable& symbols,
|
|
UErrorCode& status) :
|
|
len(0), capacity(START_EXTRA), bufferCapacity(0),
|
|
buffer(0)
|
|
{
|
|
list = new UChar32[capacity];
|
|
applyPattern(pattern, pos, &symbols, status);
|
|
}
|
|
|
|
/**
|
|
* Constructs a set from the given Unicode character category.
|
|
* @param category an integer indicating the character category as
|
|
* returned by <code>Unicode::getType()</code>.
|
|
*/
|
|
UnicodeSet::UnicodeSet(int8_t category, UErrorCode& status) :
|
|
len(0), capacity(START_EXTRA), bufferCapacity(0), list(0),
|
|
buffer(0)
|
|
{
|
|
if (U_SUCCESS(status)) {
|
|
if (category < 0 || category >= Unicode::GENERAL_TYPES_COUNT) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
} else {
|
|
list = new UChar32[capacity];
|
|
*this = getCategorySet(category);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Constructs a set that is identical to the given UnicodeSet.
|
|
*/
|
|
UnicodeSet::UnicodeSet(const UnicodeSet& o) :
|
|
UnicodeFilter(o),
|
|
capacity(o.len + GROW_EXTRA), bufferCapacity(0),
|
|
buffer(0)
|
|
{
|
|
|
|
list = new UChar32[capacity];
|
|
*this = o;
|
|
}
|
|
|
|
/**
|
|
* Destructs the set.
|
|
*/
|
|
UnicodeSet::~UnicodeSet() {
|
|
delete[] list;
|
|
delete[] buffer;
|
|
}
|
|
|
|
/**
|
|
* Assigns this object to be a copy of another.
|
|
*/
|
|
UnicodeSet& UnicodeSet::operator=(const UnicodeSet& o) {
|
|
ensureCapacity(o.len);
|
|
len = o.len;
|
|
uprv_memcpy(list, o.list, len*sizeof(UChar32));
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* Compares the specified object with this set for equality. Returns
|
|
* <tt>true</tt> if the two sets
|
|
* have the same size, and every member of the specified set is
|
|
* contained in this set (or equivalently, every member of this set is
|
|
* contained in the specified set).
|
|
*
|
|
* @param o set to be compared for equality with this set.
|
|
* @return <tt>true</tt> if the specified set is equal to this set.
|
|
*/
|
|
UBool UnicodeSet::operator==(const UnicodeSet& o) const {
|
|
if (len != o.len) return FALSE;
|
|
for (int32_t i = 0; i < len; ++i) {
|
|
if (list[i] != o.list[i]) return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* Returns a copy of this object. All UnicodeFilter objects have
|
|
* to support cloning in order to allow classes using
|
|
* UnicodeFilters, such as Transliterator, to implement cloning.
|
|
*/
|
|
UnicodeFilter* UnicodeSet::clone() const {
|
|
return new UnicodeSet(*this);
|
|
}
|
|
|
|
/**
|
|
* Returns the hash code value for this set.
|
|
*
|
|
* @return the hash code value for this set.
|
|
* @see Object#hashCode()
|
|
*/
|
|
int32_t UnicodeSet::hashCode(void) const {
|
|
int32_t result = len;
|
|
for (int32_t i = 0; i < len; ++i) {
|
|
result *= 1000003;
|
|
result += list[i];
|
|
}
|
|
return result;
|
|
}
|
|
|
|
//----------------------------------------------------------------
|
|
// Public API
|
|
//----------------------------------------------------------------
|
|
|
|
/**
|
|
* Make this object represent the range <code>start - end</code>.
|
|
* If <code>end > start</code> then this object is set to an
|
|
* an empty range.
|
|
*
|
|
* @param start first character in the set, inclusive
|
|
* @rparam end last character in the set, inclusive
|
|
*/
|
|
void UnicodeSet::set(UChar32 start, UChar32 end) {
|
|
clear();
|
|
complement(start, end);
|
|
}
|
|
|
|
/**
|
|
* Modifies this set to represent the set specified by the given
|
|
* pattern, optionally ignoring white space. See the class
|
|
* description for the syntax of the pattern language.
|
|
* @param pattern a string specifying what characters are in the set
|
|
* @param ignoreSpaces if <code>true</code>, all spaces in the
|
|
* pattern are ignored. Spaces are those characters for which
|
|
* <code>Character.isSpaceChar()</code> is <code>true</code>.
|
|
* Characters preceded by '\\' are escaped, losing any special
|
|
* meaning they otherwise have. Spaces may be included by
|
|
* escaping them.
|
|
* @exception <code>IllegalArgumentException</code> if the pattern
|
|
* contains a syntax error.
|
|
*/
|
|
void UnicodeSet::applyPattern(const UnicodeString& pattern,
|
|
UErrorCode& status) {
|
|
if (U_FAILURE(status)) {
|
|
return;
|
|
}
|
|
|
|
ParsePosition pos(0);
|
|
applyPattern(pattern, pos, NULL, status);
|
|
if (U_FAILURE(status)) return;
|
|
|
|
// Skip over trailing whitespace
|
|
int32_t i = pos.getIndex();
|
|
int32_t n = pattern.length();
|
|
while (i<n && Unicode::isWhitespace(pattern.charAt(i))) {
|
|
++i;
|
|
}
|
|
|
|
if (i != n) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
}
|
|
}
|
|
|
|
const UChar UnicodeSet::HEX[16] = {48,49,50,51,52,53,54,55, // 0-7
|
|
56,57,65,66,67,68,69,70}; // 8-9 A-F
|
|
|
|
/**
|
|
* Append the <code>toPattern()</code> representation of a
|
|
* character to the given <code>StringBuffer</code>.
|
|
*/
|
|
void UnicodeSet::_toPat(UnicodeString& buf, UChar32 c) {
|
|
if (c & ~0xFFFF) {
|
|
// Escape anything above U+FFFF
|
|
buf.append(BACKSLASH);
|
|
buf.append(UPPER_U);
|
|
buf.append(HEX[0xF&(c>>20)]);
|
|
buf.append(HEX[0xF&(c>>16)]);
|
|
buf.append(HEX[0xF&(c>>12)]);
|
|
buf.append(HEX[0xF&(c>>8)]);
|
|
buf.append(HEX[0xF&(c>>4)]);
|
|
buf.append(HEX[0xF&c]);
|
|
return;
|
|
}
|
|
// Okay to let ':' pass through
|
|
switch (c) {
|
|
case SET_OPEN:
|
|
case SET_CLOSE:
|
|
case HYPHEN:
|
|
case COMPLEMENT:
|
|
case INTERSECTION:
|
|
case BACKSLASH:
|
|
buf.append(BACKSLASH);
|
|
}
|
|
buf.append((UChar) c);
|
|
}
|
|
|
|
/**
|
|
* Returns a string representation of this set. If the result of
|
|
* calling this function is passed to a UnicodeSet constructor, it
|
|
* will produce another set that is equal to this one.
|
|
*/
|
|
UnicodeString& UnicodeSet::toPattern(UnicodeString& result) const {
|
|
result.remove().append(SET_OPEN);
|
|
|
|
int32_t count = getRangeCount();
|
|
for (int32_t i = 0; i < count; ++i) {
|
|
UChar32 start = getRangeStart(i);
|
|
UChar32 end = getRangeEnd(i);
|
|
_toPat(result, start);
|
|
if (start != end) {
|
|
result.append(HYPHEN);
|
|
_toPat(result, end);
|
|
}
|
|
}
|
|
|
|
return result.append(SET_CLOSE);
|
|
}
|
|
|
|
/**
|
|
* Returns the number of elements in this set (its cardinality),
|
|
* <em>n</em>, where <code>0 <= </code><em>n</em><code> <= 65536</code>.
|
|
*
|
|
* @return the number of elements in this set (its cardinality).
|
|
*/
|
|
int32_t UnicodeSet::size(void) const {
|
|
int32_t n = 0;
|
|
int32_t count = getRangeCount();
|
|
for (int32_t i = 0; i < count; ++i) {
|
|
n += getRangeEnd(i) - getRangeStart(i) + 1;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
/**
|
|
* Returns <tt>true</tt> if this set contains no elements.
|
|
*
|
|
* @return <tt>true</tt> if this set contains no elements.
|
|
*/
|
|
UBool UnicodeSet::isEmpty(void) const {
|
|
return len == 1;
|
|
}
|
|
|
|
/**
|
|
* Returns <tt>true</tt> if this set contains every character
|
|
* in the specified range of chars.
|
|
* If <code>end > start</code> then the results of this method
|
|
* are undefined.
|
|
*
|
|
* @return <tt>true</tt> if this set contains the specified range
|
|
* of chars.
|
|
*/
|
|
UBool UnicodeSet::contains(UChar32 start, UChar32 end) const {
|
|
int32_t i = -1;
|
|
for (;;) {
|
|
if (start < list[++i]) break;
|
|
}
|
|
return ((i & 1) != 0 && end < list[i]);
|
|
}
|
|
|
|
/**
|
|
* Returns <tt>true</tt> if this set contains the specified char.
|
|
*
|
|
* @return <tt>true</tt> if this set contains the specified char.
|
|
*/
|
|
UBool UnicodeSet::contains(UChar32 c) const {
|
|
// Set i to the index of the start item greater than ch
|
|
// We know we will terminate without length test!
|
|
// LATER: for large sets, add binary search
|
|
int32_t i = -1;
|
|
for (;;) {
|
|
if (c < list[++i]) break;
|
|
}
|
|
return ((i & 1) != 0); // return true if odd
|
|
}
|
|
|
|
/**
|
|
* Implement UnicodeFilter:
|
|
* Returns <tt>true</tt> if this set contains the specified char.
|
|
*
|
|
* @return <tt>true</tt> if this set contains the specified char.
|
|
* @draft
|
|
*/
|
|
UBool UnicodeSet::contains(UChar c) const {
|
|
return contains((UChar32) c);
|
|
}
|
|
|
|
/**
|
|
* Returns <tt>true</tt> if this set contains any character whose low byte
|
|
* is the given value. This is used by <tt>RuleBasedTransliterator</tt> for
|
|
* indexing.
|
|
*/
|
|
UBool UnicodeSet::containsIndexValue(uint8_t v) const {
|
|
/* The index value v, in the range [0,255], is contained in this set if
|
|
* it is contained in any pair of this set. Pairs either have the high
|
|
* bytes equal, or unequal. If the high bytes are equal, then we have
|
|
* aaxx..aayy, where aa is the high byte. Then v is contained if xx <=
|
|
* v <= yy. If the high bytes are unequal we have aaxx..bbyy, bb>aa.
|
|
* Then v is contained if xx <= v || v <= yy. (This is identical to the
|
|
* time zone month containment logic.)
|
|
*/
|
|
for (int32_t i=0; i<getRangeCount(); ++i) {
|
|
UChar32 low = getRangeStart(i);
|
|
UChar32 high = getRangeEnd(i);
|
|
if ((low & ~0xFF) == (high & ~0xFF)) {
|
|
if ((low & 0xFF) <= v && v <= (high & 0xFF)) {
|
|
return TRUE;
|
|
}
|
|
} else if ((low & 0xFF) <= v || v <= (high & 0xFF)) {
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* Adds the specified range to this set if it is not already
|
|
* present. If this set already contains the specified range,
|
|
* the call leaves this set unchanged. If <code>end > start</code>
|
|
* then an empty range is added, leaving the set unchanged.
|
|
*
|
|
* @param start first character, inclusive, of range to be added
|
|
* to this set.
|
|
* @param end last character, inclusive, of range to be added
|
|
* to this set.
|
|
*/
|
|
void UnicodeSet::add(UChar32 start, UChar32 end) {
|
|
if (start <= end) {
|
|
UChar32 range[3] = { start, end+1, HIGH };
|
|
add(range, 2, 0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Adds the specified character to this set if it is not already
|
|
* present. If this set already contains the specified character,
|
|
* the call leaves this set unchanged.
|
|
*/
|
|
void UnicodeSet::add(UChar32 c) {
|
|
add(c, c);
|
|
}
|
|
|
|
/**
|
|
* Retain only the elements in this set that are contained in the
|
|
* specified range. If <code>end > start</code> then an empty range is
|
|
* retained, leaving the set empty.
|
|
*
|
|
* @param start first character, inclusive, of range to be retained
|
|
* to this set.
|
|
* @param end last character, inclusive, of range to be retained
|
|
* to this set.
|
|
*/
|
|
void UnicodeSet::retain(UChar32 start, UChar32 end) {
|
|
if (start <= end) {
|
|
UChar32 range[3] = { start, end+1, HIGH };
|
|
retain(range, 2, 0);
|
|
} else {
|
|
clear();
|
|
}
|
|
}
|
|
|
|
void UnicodeSet::retain(UChar32 c) {
|
|
retain(c, c);
|
|
}
|
|
|
|
/**
|
|
* Removes the specified range from this set if it is present.
|
|
* The set will not contain the specified range once the call
|
|
* returns. If <code>end > start</code> then an empty range is
|
|
* removed, leaving the set unchanged.
|
|
*
|
|
* @param start first character, inclusive, of range to be removed
|
|
* from this set.
|
|
* @param end last character, inclusive, of range to be removed
|
|
* from this set.
|
|
*/
|
|
void UnicodeSet::remove(UChar32 start, UChar32 end) {
|
|
if (start <= end) {
|
|
UChar32 range[3] = { start, end+1, HIGH };
|
|
retain(range, 2, 2);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Removes the specified character from this set if it is present.
|
|
* The set will not contain the specified range once the call
|
|
* returns.
|
|
*/
|
|
void UnicodeSet::remove(UChar32 c) {
|
|
remove(c, c);
|
|
}
|
|
|
|
/**
|
|
* Complements the specified range in this set. Any character in
|
|
* the range will be removed if it is in this set, or will be
|
|
* added if it is not in this set. If <code>end > start</code>
|
|
* then an empty range is xor'ed, leaving the set unchanged.
|
|
*
|
|
* @param start first character, inclusive, of range to be removed
|
|
* from this set.
|
|
* @param end last character, inclusive, of range to be removed
|
|
* from this set.
|
|
*/
|
|
void UnicodeSet::complement(UChar32 start, UChar32 end) {
|
|
if (start <= end) {
|
|
UChar32 range[3] = { start, end+1, HIGH };
|
|
exclusiveOr(range, 2, 0);
|
|
}
|
|
}
|
|
|
|
void UnicodeSet::complement(UChar32 c) {
|
|
complement(c, c);
|
|
}
|
|
|
|
/**
|
|
* Returns <tt>true</tt> if the specified set is a <i>subset</i>
|
|
* of this set.
|
|
*
|
|
* @param c set to be checked for containment in this set.
|
|
* @return <tt>true</tt> if this set contains all of the elements of the
|
|
* specified set.
|
|
*/
|
|
UBool UnicodeSet::containsAll(const UnicodeSet& c) const {
|
|
// The specified set is a subset if all of its pairs are contained in
|
|
// this set. It's possible to code this more efficiently in terms of
|
|
// direct manipulation of the inversion lists if the need arises.
|
|
int32_t n = c.getRangeCount();
|
|
for (int i=0; i<n; ++i) {
|
|
if (!contains(c.getRangeStart(i), c.getRangeEnd(i))) {
|
|
return FALSE;
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* Adds all of the elements in the specified set to this set if
|
|
* they're not already present. This operation effectively
|
|
* modifies this set so that its value is the <i>union</i> of the two
|
|
* sets. The behavior of this operation is unspecified if the specified
|
|
* collection is modified while the operation is in progress.
|
|
*
|
|
* @param c set whose elements are to be added to this set.
|
|
* @see #add(char, char)
|
|
*/
|
|
void UnicodeSet::addAll(const UnicodeSet& c) {
|
|
add(c.list, c.len, 0);
|
|
}
|
|
|
|
/**
|
|
* Retains only the elements in this set that are contained in the
|
|
* specified set. In other words, removes from this set all of
|
|
* its elements that are not contained in the specified set. This
|
|
* operation effectively modifies this set so that its value is
|
|
* the <i>intersection</i> of the two sets.
|
|
*
|
|
* @param c set that defines which elements this set will retain.
|
|
*/
|
|
void UnicodeSet::retainAll(const UnicodeSet& c) {
|
|
retain(c.list, c.len, 0);
|
|
}
|
|
|
|
/**
|
|
* Removes from this set all of its elements that are contained in the
|
|
* specified set. This operation effectively modifies this
|
|
* set so that its value is the <i>asymmetric set difference</i> of
|
|
* the two sets.
|
|
*
|
|
* @param c set that defines which elements will be removed from
|
|
* this set.
|
|
*/
|
|
void UnicodeSet::removeAll(const UnicodeSet& c) {
|
|
retain(c.list, c.len, 2);
|
|
}
|
|
|
|
/**
|
|
* Complements in this set all elements contained in the specified
|
|
* set. Any character in the other set will be removed if it is
|
|
* in this set, or will be added if it is not in this set.
|
|
*
|
|
* @param c set that defines which elements will be xor'ed from
|
|
* this set.
|
|
*/
|
|
void UnicodeSet::complementAll(const UnicodeSet& c) {
|
|
exclusiveOr(c.list, c.len, 0);
|
|
}
|
|
|
|
/**
|
|
* Inverts this set. This operation modifies this set so that its
|
|
* value is its complement. This is equivalent to the pseudo
|
|
* code: <code>this = new UnicodeSet(UnicodeSet.MIN_VALUE,
|
|
* UnicodeSet.MAX_VALUE).removeAll(this)</code>.
|
|
*/
|
|
void UnicodeSet::complement(void) {
|
|
if (list[0] == LOW) {
|
|
ensureBufferCapacity(len-1);
|
|
uprv_memcpy(buffer, list + 1, (len-1)*sizeof(UChar32));
|
|
--len;
|
|
} else {
|
|
ensureBufferCapacity(len+1);
|
|
uprv_memcpy(buffer + 1, list, len*sizeof(UChar32));
|
|
buffer[0] = LOW;
|
|
++len;
|
|
}
|
|
swapBuffers();
|
|
}
|
|
|
|
/**
|
|
* Removes all of the elements from this set. This set will be
|
|
* empty after this call returns.
|
|
*/
|
|
void UnicodeSet::clear(void) {
|
|
list[0] = HIGH;
|
|
len = 1;
|
|
}
|
|
|
|
/**
|
|
* Iteration method that returns the number of ranges contained in
|
|
* this set.
|
|
* @see #getRangeStart
|
|
* @see #getRangeEnd
|
|
*/
|
|
int32_t UnicodeSet::getRangeCount() const {
|
|
return len/2;
|
|
}
|
|
|
|
/**
|
|
* Iteration method that returns the first character in the
|
|
* specified range of this set.
|
|
* @see #getRangeCount
|
|
* @see #getRangeEnd
|
|
*/
|
|
UChar32 UnicodeSet::getRangeStart(int32_t index) const {
|
|
return list[index*2];
|
|
}
|
|
|
|
/**
|
|
* Iteration method that returns the last character in the
|
|
* specified range of this set.
|
|
* @see #getRangeStart
|
|
* @see #getRangeEnd
|
|
*/
|
|
UChar32 UnicodeSet::getRangeEnd(int32_t index) const {
|
|
return list[index*2 + 1] - 1;
|
|
}
|
|
|
|
/**
|
|
* Reallocate this objects internal structures to take up the least
|
|
* possible space, without changing this object's value.
|
|
*/
|
|
void UnicodeSet::compact() {
|
|
if (len != capacity) {
|
|
capacity = len;
|
|
UChar32* temp = new UChar32[capacity];
|
|
uprv_memcpy(temp, list, len*sizeof(UChar32));
|
|
delete[] list;
|
|
list = temp;
|
|
}
|
|
delete[] buffer;
|
|
buffer = NULL;
|
|
}
|
|
|
|
//----------------------------------------------------------------
|
|
// Implementation: Pattern parsing
|
|
//----------------------------------------------------------------
|
|
|
|
/**
|
|
* Parses the given pattern, starting at the given position. The
|
|
* character at pattern.charAt(pos.getIndex()) must be '[', or the
|
|
* parse fails. Parsing continues until the corresponding closing
|
|
* ']'. If a syntax error is encountered between the opening and
|
|
* closing brace, the parse fails. Upon return from a U_SUCCESSful
|
|
* parse, the ParsePosition is updated to point to the character
|
|
* following the closing ']', and a StringBuffer containing a
|
|
* pairs list for the parsed pattern is returned. This method calls
|
|
* itself recursively to parse embedded subpatterns.
|
|
*
|
|
* @param pattern the string containing the pattern to be parsed.
|
|
* The portion of the string from pos.getIndex(), which must be a
|
|
* '[', to the corresponding closing ']', is parsed.
|
|
* @param pos upon entry, the position at which to being parsing.
|
|
* The character at pattern.charAt(pos.getIndex()) must be a '['.
|
|
* Upon return from a U_SUCCESSful parse, pos.getIndex() is either
|
|
* the character after the closing ']' of the parsed pattern, or
|
|
* pattern.length() if the closing ']' is the last character of
|
|
* the pattern string.
|
|
* @return a StringBuffer containing a pairs list for the parsed
|
|
* substring of <code>pattern</code>
|
|
* @exception IllegalArgumentException if the parse fails.
|
|
*/
|
|
void UnicodeSet::applyPattern(const UnicodeString& pattern,
|
|
ParsePosition& pos,
|
|
const SymbolTable* symbols,
|
|
UErrorCode& status) {
|
|
if (U_FAILURE(status)) {
|
|
return;
|
|
}
|
|
|
|
UBool invert = FALSE;
|
|
clear();
|
|
|
|
int32_t lastChar = -1; // This is either a char (0..FFFF) or -1
|
|
UChar lastOp = 0;
|
|
|
|
/* This loop iterates over the characters in the pattern. We start at
|
|
* the position specified by pos. We exit the loop when either a
|
|
* matching closing ']' is seen, or we read all characters of the
|
|
* pattern. In the latter case an error will be thrown.
|
|
*/
|
|
|
|
/* Pattern syntax:
|
|
* pat := '[' '^'? elem* ']'
|
|
* elem := a | a '-' a | set | set op set
|
|
* set := pat | (a set variable)
|
|
* op := '&' | '-'
|
|
* a := (a character, possibly defined by a var)
|
|
*/
|
|
|
|
// mode 0: No chars parsed yet; next must be '['
|
|
// mode 1: '[' seen; if next is '^' or ':' then special
|
|
// mode 2: '[' '^'? seen; parse pattern and close with ']'
|
|
// mode 3: '[:' seen; parse category and close with ':]'
|
|
int8_t mode = 0;
|
|
int32_t openPos = 0; // offset to opening '['
|
|
int32_t i = pos.getIndex();
|
|
int32_t limit = pattern.length();
|
|
UnicodeSet nestedAux;
|
|
const UnicodeSet* nestedSet; // never owned
|
|
UnicodeString scratch;
|
|
/* In the case of an embedded SymbolTable variable, we look it up and
|
|
* then take characters from the resultant char[] array. These chars
|
|
* are subjected to an extra level of lookup in the SymbolTable in case
|
|
* they are stand-ins for a nested UnicodeSet. */
|
|
const UnicodeString* varValueBuffer = NULL;
|
|
int32_t ivarValueBuffer = 0;
|
|
int32_t anchor = 0;
|
|
for (; i<limit; i+=((varValueBuffer==NULL)?1:0)) {
|
|
/* If the next element is a single character, c will be set to it,
|
|
* and nestedSet will be null. In this case isLiteral indicates
|
|
* whether the character should assume special meaning if it has
|
|
* one. If the next element is a nested set, either via a variable
|
|
* reference, or via an embedded "[..]" or "[:..:]" pattern, then
|
|
* nestedSet will be set to the pairs list for the nested set, and
|
|
* c's value should be ignored.
|
|
*/
|
|
nestedSet = NULL;
|
|
UBool isLiteral = FALSE;
|
|
UChar c;
|
|
if (varValueBuffer != NULL) {
|
|
if (ivarValueBuffer < varValueBuffer->length()) {
|
|
c = varValueBuffer->charAt(ivarValueBuffer++);
|
|
nestedSet = symbols->lookupSet(c); // may be NULL
|
|
} else {
|
|
varValueBuffer = NULL;
|
|
c = pattern.charAt(i);
|
|
}
|
|
} else {
|
|
c = pattern.charAt(i);
|
|
}
|
|
|
|
// Ignore whitespace. This is not Unicode whitespace, but Java
|
|
// whitespace, a subset of Unicode whitespace.
|
|
if (Unicode::isWhitespace(c)) {
|
|
continue;
|
|
}
|
|
|
|
// Keep track of the count of characters after an alleged anchor
|
|
if (anchor > 0) {
|
|
++anchor;
|
|
}
|
|
|
|
// Parse the opening '[' and optional following '^'
|
|
switch (mode) {
|
|
case 0:
|
|
if (c == SET_OPEN) {
|
|
mode = 1; // Next look for '^'
|
|
openPos = i;
|
|
continue;
|
|
} else {
|
|
// throw new IllegalArgumentException("Missing opening '['");
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
case 1:
|
|
mode = 2;
|
|
switch (c) {
|
|
case COMPLEMENT:
|
|
invert = TRUE;
|
|
continue; // Back to top to fetch next character
|
|
case COLON:
|
|
if (i == openPos+1) {
|
|
// '[:' cannot have whitespace in it
|
|
--i;
|
|
c = SET_OPEN;
|
|
mode = 3;
|
|
// Fall through and parse category normally
|
|
}
|
|
break; // Fall through
|
|
case HYPHEN:
|
|
isLiteral = TRUE; // Treat leading '-' as a literal
|
|
break; // Fall through
|
|
}
|
|
// else fall through and parse this character normally
|
|
}
|
|
|
|
// After opening matter is parsed ("[", "[^", or "[:"), the mode
|
|
// will be 2 if we want a closing ']', or 3 if we should parse a
|
|
// category and close with ":]".
|
|
|
|
// Only process escapes, variable references, and nested sets
|
|
// if we are _not_ retrieving characters from the variable
|
|
// buffer. Characters in the variable buffer have already
|
|
// benn through escape and variable reference processing.
|
|
if (varValueBuffer == NULL) {
|
|
/* Handle escapes. If a character is escaped, then it assumes its
|
|
* literal value. This is true for all characters, both special
|
|
* characters and characters with no special meaning. We also
|
|
* interpret '\\uxxxx' Unicode escapes here (as literals).
|
|
*/
|
|
if (c == BACKSLASH) {
|
|
++i; // Advance past '\\'
|
|
UChar32 escaped = pattern.unescapeAt(i);
|
|
if (escaped == (UChar32) -1) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
isLiteral = TRUE;
|
|
--i; // Move i back to last parsed character
|
|
c = (UChar) escaped;
|
|
}
|
|
|
|
/* Parse variable references. These are treated as literals. If a
|
|
* variable refers to a UnicodeSet, its stand in character is
|
|
* returned in the UChar[] buffer.
|
|
* Variable names are only parsed if varNameToChar is not null.
|
|
* Set variables are only looked up if varCharToSet is not null.
|
|
*/
|
|
else if (symbols != NULL && !isLiteral && c == SymbolTable::SYMBOL_REF) {
|
|
pos.setIndex(++i);
|
|
UnicodeString name = symbols->parseReference(pattern, pos, limit);
|
|
if (name.length() != 0) {
|
|
varValueBuffer = symbols->lookup(name);
|
|
if (varValueBuffer == NULL) {
|
|
//throw new IllegalArgumentException("Undefined variable: "
|
|
// + name);
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
ivarValueBuffer = 0;
|
|
i = pos.getIndex(); // Make i point PAST last char of var name
|
|
} else {
|
|
// Got a null; this means we have an isolated $.
|
|
// Tentatively assume this is an anchor.
|
|
anchor = 1;
|
|
--i; // Back up so loop increment works properly
|
|
}
|
|
continue; // Back to the top to get varValueBuffer[0]
|
|
}
|
|
|
|
/* An opening bracket indicates the first bracket of a nested
|
|
* subpattern, either a normal pattern or a category pattern. We
|
|
* recognize these here and set nestedSet accordingly.
|
|
*/
|
|
else if (!isLiteral && c == SET_OPEN) {
|
|
// Handle "[:...:]", representing a character category
|
|
UChar d = charAfter(pattern, i);
|
|
if (d == COLON) {
|
|
i += 2;
|
|
int32_t j = pattern.indexOf(CATEGORY_CLOSE, i);
|
|
if (j < 0) {
|
|
// throw new IllegalArgumentException("Missing \":]\"");
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
scratch.truncate(0);
|
|
pattern.extractBetween(i, j, scratch);
|
|
nestedAux.applyCategory(scratch, status);
|
|
nestedSet = &nestedAux;
|
|
if (U_FAILURE(status)) {
|
|
return;
|
|
}
|
|
i = j+1; // Make i point to ']' in ":]"
|
|
if (mode == 3) {
|
|
// Entire pattern is a category; leave parse loop
|
|
*this = *nestedSet;
|
|
break;
|
|
}
|
|
} else {
|
|
// Recurse to get the pairs for this nested set.
|
|
pos.setIndex(i);
|
|
nestedAux.applyPattern(pattern, pos, symbols, status);
|
|
nestedSet = &nestedAux;
|
|
if (U_FAILURE(status)) {
|
|
return;
|
|
}
|
|
i = pos.getIndex() - 1; // - 1 to point at ']'
|
|
}
|
|
}
|
|
}
|
|
|
|
/* At this point we have either a character c, or a nested set. If
|
|
* we have encountered a nested set, either embedded in the pattern,
|
|
* or as a variable, we have a non-null nestedSet, and c should be
|
|
* ignored. Otherwise c is the current character, and isLiteral
|
|
* indicates whether it is an escaped literal (or variable) or a
|
|
* normal unescaped character. Unescaped characters '-', '&', and
|
|
* ']' have special meanings.
|
|
*/
|
|
if (nestedSet != NULL) {
|
|
if (lastChar >= 0) {
|
|
if (lastOp != 0) {
|
|
// throw new IllegalArgumentException("Illegal rhs for " + lastChar + lastOp);
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
add(lastChar, lastChar);
|
|
lastChar = -1;
|
|
}
|
|
switch (lastOp) {
|
|
case HYPHEN:
|
|
removeAll(*nestedSet);
|
|
break;
|
|
case INTERSECTION:
|
|
retainAll(*nestedSet);
|
|
break;
|
|
case 0:
|
|
addAll(*nestedSet);
|
|
break;
|
|
}
|
|
lastOp = 0;
|
|
} else if (!isLiteral && c == SET_CLOSE) {
|
|
// Final closing delimiter. This is the only way we leave this
|
|
// loop if the pattern is well-formed.
|
|
if (anchor > 2 || anchor == 1) {
|
|
//throw new IllegalArgumentException("Syntax error near $" + pattern);
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
if (anchor == 2) {
|
|
add(TransliterationRule::ETHER);
|
|
}
|
|
break;
|
|
} else if (lastOp == 0 && !isLiteral && (c == HYPHEN || c == INTERSECTION)) {
|
|
lastOp = c;
|
|
} else if (lastOp == HYPHEN) {
|
|
if (lastChar >= c) {
|
|
// Don't allow redundant (a-a) or empty (b-a) ranges;
|
|
// these are most likely typos.
|
|
//throw new IllegalArgumentException("Invalid range " + lastChar +
|
|
// '-' + c);
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
add(lastChar, c);
|
|
lastOp = 0;
|
|
lastChar = -1;
|
|
} else if (lastOp != 0) {
|
|
// We have <set>&<char> or <char>&<char>
|
|
// throw new IllegalArgumentException("Unquoted " + lastOp);
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
} else {
|
|
if (lastChar >= 0) {
|
|
// We have <char><char>
|
|
add(lastChar, lastChar);
|
|
}
|
|
lastChar = c;
|
|
}
|
|
}
|
|
|
|
// Handle unprocessed stuff preceding the closing ']'
|
|
if (lastOp == HYPHEN) {
|
|
// Trailing '-' is treated as literal
|
|
add(lastOp, lastOp);
|
|
} else if (lastOp == INTERSECTION) {
|
|
// throw new IllegalArgumentException("Unquoted trailing " + lastOp);
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
if (lastChar >= 0) {
|
|
add(lastChar, lastChar);
|
|
}
|
|
|
|
/**
|
|
* If we saw a '^' after the initial '[' of this pattern, then perform
|
|
* the complement. (Inversion after '[:' is handled elsewhere.)
|
|
*/
|
|
if (invert) {
|
|
complement();
|
|
}
|
|
|
|
/**
|
|
* i indexes the last character we parsed or is pattern.length(). In
|
|
* the latter case, we have run off the end without finding a closing
|
|
* ']'. Otherwise, we know i < pattern.length(), and we set the
|
|
* ParsePosition to the next character to be parsed.
|
|
*/
|
|
if (i == limit) {
|
|
// throw new IllegalArgumentException("Missing ']'");
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
|
|
pos.setIndex(i+1);
|
|
}
|
|
|
|
//----------------------------------------------------------------
|
|
// Implementation: Generation of pairs for Unicode categories
|
|
//----------------------------------------------------------------
|
|
|
|
/**
|
|
* Sets this object to the given category, given its name.
|
|
* The category name must be either a two-letter name, such as
|
|
* "Lu", or a one letter name, such as "L". One-letter names
|
|
* indicate the logical union of all two-letter names that start
|
|
* with that letter. Case is significant. If the name starts
|
|
* with the character '^' then the complement of the given
|
|
* character set is returned.
|
|
*
|
|
* Although individual categories such as "Lu" are cached, we do
|
|
* not currently cache single-letter categories such as "L" or
|
|
* complements such as "^Lu" or "^L". It would be easy to cache
|
|
* these as well in a hashtable should the need arise.
|
|
*/
|
|
void UnicodeSet::applyCategory(const UnicodeString& catName,
|
|
UErrorCode& status) {
|
|
if (U_FAILURE(status)) {
|
|
return;
|
|
}
|
|
|
|
UnicodeString cat(catName);
|
|
UBool invert = (catName.length() > 1 &&
|
|
catName.charAt(0) == COMPLEMENT);
|
|
if (invert) {
|
|
cat.remove(0, 1);
|
|
}
|
|
|
|
UBool match = FALSE;
|
|
|
|
// if we have two characters, search the category map for that
|
|
// code and either construct and return a UnicodeSet from the
|
|
// data in the category map or throw an exception
|
|
if (cat.length() == 2) {
|
|
int32_t i = CATEGORY_NAMES.indexOf(cat);
|
|
if (i>=0 && i%2==0) {
|
|
i /= 2;
|
|
*this = getCategorySet((int8_t)i);
|
|
match = TRUE;
|
|
}
|
|
} else if (cat.length() == 1) {
|
|
// if we have one character, search the category map for
|
|
// codes beginning with that letter, and union together
|
|
// all of the matching sets that we find (or throw an
|
|
// exception if there are no matches)
|
|
clear();
|
|
for (int32_t i=0; i<Unicode::GENERAL_TYPES_COUNT; ++i) {
|
|
if (CATEGORY_NAMES.charAt(2*i) == cat.charAt(0)) {
|
|
addAll(getCategorySet((int8_t)i));
|
|
match = TRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!match) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
|
|
if (invert) {
|
|
complement();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns a pairs string for the given category. This string is
|
|
* cached and returned again if this method is called again with
|
|
* the same parameter.
|
|
*/
|
|
const UnicodeSet& UnicodeSet::getCategorySet(int8_t cat) {
|
|
// In order to tell what cache entries are empty, we assume
|
|
// every category specifies at least one character. Thus
|
|
// sets in the cache that are empty are uninitialized.
|
|
if (CATEGORY_CACHE[cat].isEmpty()) {
|
|
// Walk through all Unicode characters, noting the start
|
|
// and end of each range for which Character.getType(c)
|
|
// returns the given category integer. Since we are
|
|
// iterating in order, we can simply append the resulting
|
|
// ranges to the pairs string.
|
|
UnicodeSet& set = CATEGORY_CACHE[cat];
|
|
int32_t start = -1;
|
|
int32_t end = -2;
|
|
// N.B.: Change upper limit to 0x10FFFF when there is
|
|
// actually something up there.
|
|
for (int32_t i=0; i<=0xFFFF; ++i) {
|
|
if (Unicode::getType((UChar)i) == cat) {
|
|
if ((end+1) == i) {
|
|
end = i;
|
|
} else {
|
|
if (start >= 0) {
|
|
set.add((UChar32)start, (UChar32)end);
|
|
}
|
|
start = end = i;
|
|
}
|
|
}
|
|
}
|
|
if (start >= 0) {
|
|
set.add((UChar32)start, (UChar32)end);
|
|
}
|
|
}
|
|
return CATEGORY_CACHE[cat];
|
|
}
|
|
|
|
//----------------------------------------------------------------
|
|
// Implementation: Utility methods
|
|
//----------------------------------------------------------------
|
|
|
|
/**
|
|
* Returns the character after the given position, or '\uFFFE' if
|
|
* there is none.
|
|
*/
|
|
UChar UnicodeSet::charAfter(const UnicodeString& str, int32_t i) {
|
|
return ((++i) < str.length()) ? str.charAt(i) : (UChar)0xFFFE;
|
|
}
|
|
|
|
void UnicodeSet::ensureCapacity(int32_t newLen) {
|
|
if (newLen <= capacity) return;
|
|
capacity = newLen + GROW_EXTRA;
|
|
UChar32* temp = new UChar32[capacity];
|
|
uprv_memcpy(temp, list, len*sizeof(UChar32));
|
|
delete[] list;
|
|
list = temp;
|
|
}
|
|
|
|
void UnicodeSet::ensureBufferCapacity(int32_t newLen) {
|
|
if (buffer != NULL && newLen <= bufferCapacity) return;
|
|
delete[] buffer;
|
|
bufferCapacity = newLen + GROW_EXTRA;
|
|
buffer = new UChar32[bufferCapacity];
|
|
}
|
|
|
|
/**
|
|
* Swap list and buffer.
|
|
*/
|
|
void UnicodeSet::swapBuffers(void) {
|
|
// swap list and buffer
|
|
UChar32* temp = list;
|
|
list = buffer;
|
|
buffer = temp;
|
|
|
|
int32_t c = capacity;
|
|
capacity = bufferCapacity;
|
|
bufferCapacity = c;
|
|
}
|
|
|
|
//----------------------------------------------------------------
|
|
// Implementation: Fundamental operators
|
|
//----------------------------------------------------------------
|
|
|
|
inline UChar32 max(UChar32 a, UChar32 b) {
|
|
return (a > b) ? a : b;
|
|
}
|
|
|
|
// polarity = 0, 3 is normal: x xor y
|
|
// polarity = 1, 2: x xor ~y == x === y
|
|
|
|
void UnicodeSet::exclusiveOr(const UChar32* other, int32_t otherLen, int8_t polarity) {
|
|
ensureBufferCapacity(len + otherLen);
|
|
int32_t i = 0, j = 0, k = 0;
|
|
UChar32 a = list[i++];
|
|
UChar32 b;
|
|
if (polarity == 1 || polarity == 2) {
|
|
b = LOW;
|
|
if (other[j] == LOW) { // skip base if already LOW
|
|
++j;
|
|
b = other[j];
|
|
}
|
|
} else {
|
|
b = other[j++];
|
|
}
|
|
// simplest of all the routines
|
|
// sort the values, discarding identicals!
|
|
for (;;) {
|
|
if (a < b) {
|
|
buffer[k++] = a;
|
|
a = list[i++];
|
|
} else if (b < a) {
|
|
buffer[k++] = b;
|
|
b = other[j++];
|
|
} else if (a != HIGH) { // at this point, a == b
|
|
// discard both values!
|
|
a = list[i++];
|
|
b = other[j++];
|
|
} else { // DONE!
|
|
buffer[k++] = HIGH;
|
|
len = k;
|
|
break;
|
|
}
|
|
}
|
|
swapBuffers();
|
|
}
|
|
|
|
// polarity = 0 is normal: x union y
|
|
// polarity = 2: x union ~y
|
|
// polarity = 1: ~x union y
|
|
// polarity = 3: ~x union ~y
|
|
|
|
void UnicodeSet::add(const UChar32* other, int32_t otherLen, int8_t polarity) {
|
|
ensureBufferCapacity(len + otherLen);
|
|
int32_t i = 0, j = 0, k = 0;
|
|
UChar32 a = list[i++];
|
|
UChar32 b = other[j++];
|
|
// change from xor is that we have to check overlapping pairs
|
|
// polarity bit 1 means a is second, bit 2 means b is.
|
|
for (;;) {
|
|
switch (polarity) {
|
|
case 0: // both first; take lower if unequal
|
|
if (a < b) { // take a
|
|
// Back up over overlapping ranges in buffer[]
|
|
if (k > 0 && a <= buffer[k-1]) {
|
|
// Pick latter end value in buffer[] vs. list[]
|
|
a = max(list[i], buffer[--k]);
|
|
} else {
|
|
// No overlap
|
|
buffer[k++] = a;
|
|
a = list[i];
|
|
}
|
|
i++; // Common if/else code factored out
|
|
polarity ^= 1;
|
|
} else if (b < a) { // take b
|
|
if (k > 0 && b <= buffer[k-1]) {
|
|
b = max(other[j], buffer[--k]);
|
|
} else {
|
|
buffer[k++] = b;
|
|
b = other[j];
|
|
}
|
|
j++;
|
|
polarity ^= 2;
|
|
} else { // a == b, take a, drop b
|
|
if (a == HIGH) goto loop_end;
|
|
// This is symmetrical; it doesn't matter if
|
|
// we backtrack with a or b. - liu
|
|
if (k > 0 && a <= buffer[k-1]) {
|
|
a = max(list[i], buffer[--k]);
|
|
} else {
|
|
// No overlap
|
|
buffer[k++] = a;
|
|
a = list[i];
|
|
}
|
|
i++;
|
|
polarity ^= 1;
|
|
b = other[j++]; polarity ^= 2;
|
|
}
|
|
break;
|
|
case 3: // both second; take higher if unequal, and drop other
|
|
if (b <= a) { // take a
|
|
if (a == HIGH) goto loop_end;
|
|
buffer[k++] = a;
|
|
} else { // take b
|
|
if (b == HIGH) goto loop_end;
|
|
buffer[k++] = b;
|
|
}
|
|
a = list[i++]; polarity ^= 1; // factored common code
|
|
b = other[j++]; polarity ^= 2;
|
|
break;
|
|
case 1: // a second, b first; if b < a, overlap
|
|
if (a < b) { // no overlap, take a
|
|
buffer[k++] = a; a = list[i++]; polarity ^= 1;
|
|
} else if (b < a) { // OVERLAP, drop b
|
|
b = other[j++]; polarity ^= 2;
|
|
} else { // a == b, drop both!
|
|
if (a == HIGH) goto loop_end;
|
|
a = list[i++]; polarity ^= 1;
|
|
b = other[j++]; polarity ^= 2;
|
|
}
|
|
break;
|
|
case 2: // a first, b second; if a < b, overlap
|
|
if (b < a) { // no overlap, take b
|
|
buffer[k++] = b; b = other[j++]; polarity ^= 2;
|
|
} else if (a < b) { // OVERLAP, drop a
|
|
a = list[i++]; polarity ^= 1;
|
|
} else { // a == b, drop both!
|
|
if (a == HIGH) goto loop_end;
|
|
a = list[i++]; polarity ^= 1;
|
|
b = other[j++]; polarity ^= 2;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
loop_end:
|
|
buffer[k++] = HIGH; // terminate
|
|
len = k;
|
|
swapBuffers();
|
|
}
|
|
|
|
// polarity = 0 is normal: x intersect y
|
|
// polarity = 2: x intersect ~y == set-minus
|
|
// polarity = 1: ~x intersect y
|
|
// polarity = 3: ~x intersect ~y
|
|
|
|
void UnicodeSet::retain(const UChar32* other, int32_t otherLen, int8_t polarity) {
|
|
ensureBufferCapacity(len + otherLen);
|
|
int32_t i = 0, j = 0, k = 0;
|
|
UChar32 a = list[i++];
|
|
UChar32 b = other[j++];
|
|
// change from xor is that we have to check overlapping pairs
|
|
// polarity bit 1 means a is second, bit 2 means b is.
|
|
for (;;) {
|
|
switch (polarity) {
|
|
case 0: // both first; drop the smaller
|
|
if (a < b) { // drop a
|
|
a = list[i++]; polarity ^= 1;
|
|
} else if (b < a) { // drop b
|
|
b = other[j++]; polarity ^= 2;
|
|
} else { // a == b, take one, drop other
|
|
if (a == HIGH) goto loop_end;
|
|
buffer[k++] = a; a = list[i++]; polarity ^= 1;
|
|
b = other[j++]; polarity ^= 2;
|
|
}
|
|
break;
|
|
case 3: // both second; take lower if unequal
|
|
if (a < b) { // take a
|
|
buffer[k++] = a; a = list[i++]; polarity ^= 1;
|
|
} else if (b < a) { // take b
|
|
buffer[k++] = b; b = other[j++]; polarity ^= 2;
|
|
} else { // a == b, take one, drop other
|
|
if (a == HIGH) goto loop_end;
|
|
buffer[k++] = a; a = list[i++]; polarity ^= 1;
|
|
b = other[j++]; polarity ^= 2;
|
|
}
|
|
break;
|
|
case 1: // a second, b first;
|
|
if (a < b) { // NO OVERLAP, drop a
|
|
a = list[i++]; polarity ^= 1;
|
|
} else if (b < a) { // OVERLAP, take b
|
|
buffer[k++] = b; b = other[j++]; polarity ^= 2;
|
|
} else { // a == b, drop both!
|
|
if (a == HIGH) goto loop_end;
|
|
a = list[i++]; polarity ^= 1;
|
|
b = other[j++]; polarity ^= 2;
|
|
}
|
|
break;
|
|
case 2: // a first, b second; if a < b, overlap
|
|
if (b < a) { // no overlap, drop b
|
|
b = other[j++]; polarity ^= 2;
|
|
} else if (a < b) { // OVERLAP, take a
|
|
buffer[k++] = a; a = list[i++]; polarity ^= 1;
|
|
} else { // a == b, drop both!
|
|
if (a == HIGH) goto loop_end;
|
|
a = list[i++]; polarity ^= 1;
|
|
b = other[j++]; polarity ^= 2;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
loop_end:
|
|
buffer[k++] = HIGH; // terminate
|
|
len = k;
|
|
swapBuffers();
|
|
}
|