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/*
******************************************************************************
*
* Copyright (C) 2007, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
* file name: unisetspan.h
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2007mar01
* created by: Markus W. Scherer
*/
#ifndef __UNISETSPAN_H__
#define __UNISETSPAN_H__
#include "unicode/utypes.h"
#include "unicode/uniset.h"
U_NAMESPACE_BEGIN
/*
* Implement span() etc. for a set with strings.
* Avoid recursion because of its exponential complexity.
* Instead, try multiple paths at once and track them with an IndexList.
*/
class UnicodeSetStringSpan : public UMemory {
public:
/*
* Which span() variant will be used?
* The object is either built for one variant and used once,
* or built for all and may be used many times.
*/
enum {
FWD = 0x20,
BACK = 0x10,
UTF16 = 8,
UTF8 = 4,
CONTAINED = 2,
NOT_CONTAINED = 1,
ALL = 0x3f,
FWD_UTF16_CONTAINED = FWD | UTF16 | CONTAINED,
FWD_UTF16_NOT_CONTAINED = FWD | UTF16 | NOT_CONTAINED,
FWD_UTF8_CONTAINED = FWD | UTF8 | CONTAINED,
FWD_UTF8_NOT_CONTAINED = FWD | UTF8 | NOT_CONTAINED,
BACK_UTF16_CONTAINED = BACK | UTF16 | CONTAINED,
BACK_UTF16_NOT_CONTAINED= BACK | UTF16 | NOT_CONTAINED,
BACK_UTF8_CONTAINED = BACK | UTF8 | CONTAINED,
BACK_UTF8_NOT_CONTAINED = BACK | UTF8 | NOT_CONTAINED
};
UnicodeSetStringSpan(const UnicodeSet &set, const UVector &setStrings, uint32_t which);
// Copy constructor. Assumes which==ALL for a frozen set.
UnicodeSetStringSpan(const UnicodeSetStringSpan &otherStringSpan, const UVector &newParentSetStrings);
~UnicodeSetStringSpan();
/*
* Do the strings need to be checked in span() etc.?
* @return TRUE if strings need to be checked (call span() here),
* FALSE if not (use a BMPSet for best performance).
*/
inline UBool needsStringSpanUTF16();
inline UBool needsStringSpanUTF8();
// For fast UnicodeSet::contains(c).
inline UBool contains(UChar32 c) const;
int32_t span(const UChar *s, int32_t length, USetSpanCondition spanCondition) const;
int32_t spanBack(const UChar *s, int32_t length, USetSpanCondition spanCondition) const;
int32_t spanUTF8(const uint8_t *s, int32_t length, USetSpanCondition spanCondition) const;
int32_t spanBackUTF8(const uint8_t *s, int32_t length, USetSpanCondition spanCondition) const;
private:
// Special spanLength byte values.
enum {
// The spanLength is >=0xfe.
LONG_SPAN=0xfe,
// All code points in the string are contained in the parent set.
ALL_CP_CONTAINED=0xff
};
// Add a starting or ending string character to the spanNotSet
// so that a character span ends before any string.
void addToSpanNotSet(UChar32 c);
int32_t spanNot(const UChar *s, int32_t length) const;
int32_t spanNotBack(const UChar *s, int32_t length) const;
int32_t spanNotUTF8(const uint8_t *s, int32_t length) const;
int32_t spanNotBackUTF8(const uint8_t *s, int32_t length) const;
// Set for span(). Same as parent but without strings.
UnicodeSet spanSet;
// Set for span(not contained).
// Same as spanSet, plus characters that start or end strings.
UnicodeSet *pSpanNotSet;
// The strings of the parent set.
const UVector &strings;
// Pointer to the UTF-8 string lengths.
// Also pointer to further allocated storage for meta data and
// UTF-8 string contents as necessary.
int32_t *utf8Lengths;
// Pointer to the part of the (utf8Lengths) memory block that stores
// the lengths of span(), spanBack() etc. for each string.
uint8_t *spanLengths;
// Pointer to the part of the (utf8Lengths) memory block that stores
// the UTF-8 versions of the parent set's strings.
uint8_t *utf8;
// Number of bytes for all UTF-8 versions of strings together.
int32_t utf8Length;
// Maximum lengths of relevant strings.
int32_t maxLength16;
int32_t maxLength8;
// Set up for all variants of span()?
UBool all;
// Memory for small numbers and lengths of strings.
// For example, for 8 strings:
// 8 UTF-8 lengths, 8*4 bytes span lengths, 8*2 3-byte UTF-8 characters
// = 112 bytes = int32_t[28].
int32_t staticLengths[32];
};
UBool UnicodeSetStringSpan::needsStringSpanUTF16() {
return (UBool)(maxLength16!=0);
}
UBool UnicodeSetStringSpan::needsStringSpanUTF8() {
return (UBool)(maxLength8!=0);
}
UBool UnicodeSetStringSpan::contains(UChar32 c) const {
return spanSet.contains(c);
}
U_NAMESPACE_END
#endif
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