158 lines
5.0 KiB
C++
158 lines
5.0 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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******************************************************************************
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*
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* Copyright (C) 2007, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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******************************************************************************
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* file name: unisetspan.h
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* encoding: UTF-8
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2007mar01
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* created by: Markus W. Scherer
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*/
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#ifndef __UNISETSPAN_H__
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#define __UNISETSPAN_H__
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#include "unicode/utypes.h"
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#include "unicode/uniset.h"
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U_NAMESPACE_BEGIN
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/*
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* Implement span() etc. for a set with strings.
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* Avoid recursion because of its exponential complexity.
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* Instead, try multiple paths at once and track them with an IndexList.
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*/
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class UnicodeSetStringSpan : public UMemory {
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public:
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/*
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* Which span() variant will be used?
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* The object is either built for one variant and used once,
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* or built for all and may be used many times.
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*/
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enum {
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FWD = 0x20,
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BACK = 0x10,
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UTF16 = 8,
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UTF8 = 4,
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CONTAINED = 2,
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NOT_CONTAINED = 1,
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ALL = 0x3f,
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FWD_UTF16_CONTAINED = FWD | UTF16 | CONTAINED,
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FWD_UTF16_NOT_CONTAINED = FWD | UTF16 | NOT_CONTAINED,
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FWD_UTF8_CONTAINED = FWD | UTF8 | CONTAINED,
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FWD_UTF8_NOT_CONTAINED = FWD | UTF8 | NOT_CONTAINED,
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BACK_UTF16_CONTAINED = BACK | UTF16 | CONTAINED,
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BACK_UTF16_NOT_CONTAINED= BACK | UTF16 | NOT_CONTAINED,
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BACK_UTF8_CONTAINED = BACK | UTF8 | CONTAINED,
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BACK_UTF8_NOT_CONTAINED = BACK | UTF8 | NOT_CONTAINED
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};
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UnicodeSetStringSpan(const UnicodeSet &set, const UVector &setStrings, uint32_t which);
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// Copy constructor. Assumes which==ALL for a frozen set.
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UnicodeSetStringSpan(const UnicodeSetStringSpan &otherStringSpan, const UVector &newParentSetStrings);
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~UnicodeSetStringSpan();
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/*
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* Do the strings need to be checked in span() etc.?
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* @return true if strings need to be checked (call span() here),
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* false if not (use a BMPSet for best performance).
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*/
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inline UBool needsStringSpanUTF16();
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inline UBool needsStringSpanUTF8();
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// For fast UnicodeSet::contains(c).
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inline UBool contains(UChar32 c) const;
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int32_t span(const UChar *s, int32_t length, USetSpanCondition spanCondition) const;
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int32_t spanBack(const UChar *s, int32_t length, USetSpanCondition spanCondition) const;
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int32_t spanUTF8(const uint8_t *s, int32_t length, USetSpanCondition spanCondition) const;
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int32_t spanBackUTF8(const uint8_t *s, int32_t length, USetSpanCondition spanCondition) const;
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private:
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// Special spanLength byte values.
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enum {
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// The spanLength is >=0xfe.
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LONG_SPAN=0xfe,
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// All code points in the string are contained in the parent set.
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ALL_CP_CONTAINED=0xff
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};
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// Add a starting or ending string character to the spanNotSet
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// so that a character span ends before any string.
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void addToSpanNotSet(UChar32 c);
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int32_t spanNot(const UChar *s, int32_t length) const;
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int32_t spanNotBack(const UChar *s, int32_t length) const;
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int32_t spanNotUTF8(const uint8_t *s, int32_t length) const;
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int32_t spanNotBackUTF8(const uint8_t *s, int32_t length) const;
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// Set for span(). Same as parent but without strings.
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UnicodeSet spanSet;
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// Set for span(not contained).
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// Same as spanSet, plus characters that start or end strings.
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UnicodeSet *pSpanNotSet;
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// The strings of the parent set.
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const UVector &strings;
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// Pointer to the UTF-8 string lengths.
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// Also pointer to further allocated storage for meta data and
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// UTF-8 string contents as necessary.
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int32_t *utf8Lengths;
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// Pointer to the part of the (utf8Lengths) memory block that stores
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// the lengths of span(), spanBack() etc. for each string.
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uint8_t *spanLengths;
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// Pointer to the part of the (utf8Lengths) memory block that stores
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// the UTF-8 versions of the parent set's strings.
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uint8_t *utf8;
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// Number of bytes for all UTF-8 versions of strings together.
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int32_t utf8Length;
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// Maximum lengths of relevant strings.
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int32_t maxLength16;
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int32_t maxLength8;
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// Set up for all variants of span()?
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UBool all;
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// Memory for small numbers and lengths of strings.
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// For example, for 8 strings:
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// 8 UTF-8 lengths, 8*4 bytes span lengths, 8*2 3-byte UTF-8 characters
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// = 112 bytes = int32_t[28].
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int32_t staticLengths[32];
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};
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UBool UnicodeSetStringSpan::needsStringSpanUTF16() {
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return (UBool)(maxLength16!=0);
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}
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UBool UnicodeSetStringSpan::needsStringSpanUTF8() {
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return (UBool)(maxLength8!=0);
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}
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UBool UnicodeSetStringSpan::contains(UChar32 c) const {
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return spanSet.contains(c);
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}
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U_NAMESPACE_END
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#endif
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