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// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
// norms.h
// created: 2017jun04 Markus W. Scherer
// (pulled out of n2builder.cpp)
// Storing & manipulating Normalizer2 builder data.
#ifndef __NORMS_H__
#define __NORMS_H__
#include "unicode/utypes.h"
#if !UCONFIG_NO_NORMALIZATION
#include "unicode/errorcode.h"
#include "unicode/umutablecptrie.h"
#include "unicode/uniset.h"
#include "unicode/unistr.h"
#include "unicode/utf16.h"
#include "normalizer2impl.h"
#include "toolutil.h"
#include "uvectr32.h"
U_NAMESPACE_BEGIN
class BuilderReorderingBuffer {
public:
BuilderReorderingBuffer() : fLength(0), fLastStarterIndex(-1), fDidReorder(false) {}
void reset() {
fLength=0;
fLastStarterIndex=-1;
fDidReorder=false;
}
int32_t length() const { return fLength; }
UBool isEmpty() const { return fLength==0; }
int32_t lastStarterIndex() const { return fLastStarterIndex; }
UChar32 charAt(int32_t i) const { return fArray[i]>>8; }
uint8_t ccAt(int32_t i) const { return (uint8_t)fArray[i]; }
UBool didReorder() const { return fDidReorder; }
void append(UChar32 c, uint8_t cc);
void toString(UnicodeString &dest) const;
private:
int32_t fArray[Normalizer2Impl::MAPPING_LENGTH_MASK];
int32_t fLength;
int32_t fLastStarterIndex;
UBool fDidReorder;
};
struct CompositionPair {
CompositionPair(UChar32 t, UChar32 c) : trail(t), composite(c) {}
UChar32 trail, composite;
};
struct Norm {
enum MappingType { NONE, REMOVED, ROUND_TRIP, ONE_WAY };
UBool hasMapping() const { return mappingType>REMOVED; }
// Requires hasMapping() and well-formed mapping.
void setMappingCP() {
UChar32 c;
if(!mapping->isEmpty() && mapping->length()==U16_LENGTH(c=mapping->char32At(0))) {
mappingCP=c;
} else {
mappingCP=U_SENTINEL;
}
}
const CompositionPair *getCompositionPairs(int32_t &length) const {
if(compositions==nullptr) {
length=0;
return nullptr;
} else {
length=compositions->size()/2;
return reinterpret_cast<const CompositionPair *>(compositions->getBuffer());
}
}
UChar32 combine(UChar32 trail) const;
UnicodeString *mapping;
UnicodeString *rawMapping; // non-nullptr if the mapping is further decomposed
UChar32 mappingCP; // >=0 if mapping to 1 code point
int32_t mappingPhase;
MappingType mappingType;
UVector32 *compositions; // (trail, composite) pairs
uint8_t cc, leadCC, trailCC;
UBool combinesBack;
UBool hasCompBoundaryBefore, hasCompBoundaryAfter;
/**
* Overall type of normalization properties.
* Set after most processing is done.
*
* Corresponds to the rows in the chart on
* https://icu.unicode.org/design/normalization/custom
* in numerical (but reverse visual) order.
*
* YES_NO means composition quick check=yes, decomposition QC=no -- etc.
*/
enum Type {
/** Initial value until most processing is done. */
UNKNOWN,
/** No mapping, does not combine, ccc=0. */
INERT,
/** Starter, no mapping, has compositions. */
YES_YES_COMBINES_FWD,
/** Starter with a round-trip mapping and compositions. */
YES_NO_COMBINES_FWD,
/** Starter with a round-trip mapping but no compositions. */
YES_NO_MAPPING_ONLY,
/** Has a one-way mapping which is comp-normalized. */
NO_NO_COMP_YES,
/** Has a one-way mapping which is not comp-normalized but has a comp boundary before. */
NO_NO_COMP_BOUNDARY_BEFORE,
/** Has a one-way mapping which does not have a comp boundary before. */
NO_NO_COMP_NO_MAYBE_CC,
/** Has a one-way mapping to the empty string. */
NO_NO_EMPTY,
/** Has an algorithmic one-way mapping to a single code point. */
NO_NO_DELTA,
/**
* Combines both backward and forward, has compositions.
* Allowed, but not normally used.
*/
MAYBE_YES_COMBINES_FWD,
/** Combines only backward. */
MAYBE_YES_SIMPLE,
/** Non-zero ccc but does not combine backward. */
YES_YES_WITH_CC
} type;
/** Offset into the type's part of the extra data, or the algorithmic-mapping delta. */
int32_t offset;
/**
* Error string set by processing functions that do not have access
* to the code point, deferred for readable reporting.
*/
const char *error;
};
class Norms {
public:
Norms(UErrorCode &errorCode);
~Norms();
int32_t length() const { return utm_countItems(normMem); }
const Norm &getNormRefByIndex(int32_t i) const { return norms[i]; }
Norm &getNormRefByIndex(int32_t i) { return norms[i]; }
Norm *allocNorm();
/** Returns an existing Norm unit, or nullptr if c has no data. */
Norm *getNorm(UChar32 c);
const Norm *getNorm(UChar32 c) const;
/** Returns a Norm unit, creating a new one if necessary. */
Norm *createNorm(UChar32 c);
/** Returns an existing Norm unit, or an immutable empty object if c has no data. */
const Norm &getNormRef(UChar32 c) const;
uint8_t getCC(UChar32 c) const { return getNormRef(c).cc; }
UBool combinesBack(UChar32 c) const {
return Hangul::isJamoV(c) || Hangul::isJamoT(c) || getNormRef(c).combinesBack;
}
void reorder(UnicodeString &mapping, BuilderReorderingBuffer &buffer) const;
// int32_t highCC not uint8_t so that we can pass in 256 as the upper limit.
UBool combinesWithCCBetween(const Norm &norm, uint8_t lowCC, int32_t highCC) const;
class Enumerator {
public:
Enumerator(Norms &n) : norms(n) {}
virtual ~Enumerator();
/** Called for enumerated value!=0. */
virtual void rangeHandler(UChar32 start, UChar32 end, Norm &norm) = 0;
protected:
Norms &norms;
};
void enumRanges(Enumerator &e);
UnicodeSet ccSet, mappingSet;
private:
Norms(const Norms &other) = delete;
Norms &operator=(const Norms &other) = delete;
UMutableCPTrie *normTrie;
UToolMemory *normMem;
Norm *norms;
};
class CompositionBuilder : public Norms::Enumerator {
public:
CompositionBuilder(Norms &n) : Norms::Enumerator(n) {}
/** Adds a composition mapping for the first character in a round-trip mapping. */
void rangeHandler(UChar32 start, UChar32 end, Norm &norm) override;
};
class Decomposer : public Norms::Enumerator {
public:
Decomposer(Norms &n) : Norms::Enumerator(n), didDecompose(false) {}
/** Decomposes each character of the current mapping. Sets didDecompose if any. */
void rangeHandler(UChar32 start, UChar32 end, Norm &norm) override;
UBool didDecompose;
};
U_NAMESPACE_END
#endif // #if !UCONFIG_NO_NORMALIZATION
#endif // __NORMS_H__
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