158 lines
5.0 KiB
C++
158 lines
5.0 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
|
|
// License & terms of use: http://www.unicode.org/copyright.html
|
|
/*
|
|
******************************************************************************
|
|
*
|
|
* Copyright (C) 2007, International Business Machines
|
|
* Corporation and others. All Rights Reserved.
|
|
*
|
|
******************************************************************************
|
|
* file name: unisetspan.h
|
|
* encoding: UTF-8
|
|
* 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 char16_t *s, int32_t length, USetSpanCondition spanCondition) const;
|
|
|
|
int32_t spanBack(const char16_t *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 char16_t *s, int32_t length) const;
|
|
int32_t spanNotBack(const char16_t *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
|