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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
//
// rbbisetb.h
/*
**********************************************************************
* Copyright (c) 2001-2005, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
*/
#ifndef RBBISETB_H
#define RBBISETB_H
#include "unicode/utypes.h"
#if !UCONFIG_NO_BREAK_ITERATION
#include "unicode/uobject.h"
#include "rbbirb.h"
#include "utrie2.h"
#include "uvector.h"
U_NAMESPACE_BEGIN
//
// RBBISetBuilder Derives the character categories used by the runtime RBBI engine
// from the Unicode Sets appearing in the source RBBI rules, and
// creates the TRIE table used to map from Unicode to the
// character categories.
//
//
// RangeDescriptor
//
// Each of the non-overlapping character ranges gets one of these descriptors.
// All of them are strung together in a linked list, which is kept in order
// (by character)
//
class RangeDescriptor : public UMemory {
public:
UChar32 fStartChar; // Start of range, unicode 32 bit value.
UChar32 fEndChar; // End of range, unicode 32 bit value.
int32_t fNum; // runtime-mapped input value for this range.
UVector *fIncludesSets; // vector of the the original
// Unicode sets that include this range.
// (Contains ptrs to uset nodes)
RangeDescriptor *fNext; // Next RangeDescriptor in the linked list.
RangeDescriptor(UErrorCode &status);
RangeDescriptor(const RangeDescriptor &other, UErrorCode &status);
~RangeDescriptor();
void split(UChar32 where, UErrorCode &status); // Spit this range in two at "where", with
// where appearing in the second (higher) part.
void setDictionaryFlag(); // Check whether this range appears as part of
// the Unicode set named "dictionary"
private:
RangeDescriptor(const RangeDescriptor &other); // forbid copying of this class
RangeDescriptor &operator=(const RangeDescriptor &other); // forbid copying of this class
};
//
// RBBISetBuilder Handles processing of Unicode Sets from RBBI rules.
//
// Starting with the rules parse tree from the scanner,
//
// - Enumerate the set of UnicodeSets that are referenced
// by the RBBI rules.
// - compute a derived set of non-overlapping UnicodeSets
// that will correspond to columns in the state table for
// the RBBI execution engine.
// - construct the trie table that maps input characters
// to set numbers in the non-overlapping set of sets.
//
class RBBISetBuilder : public UMemory {
public:
RBBISetBuilder(RBBIRuleBuilder *rb);
~RBBISetBuilder();
void buildRanges();
void buildTrie();
void addValToSets(UVector *sets, uint32_t val);
void addValToSet (RBBINode *usetNode, uint32_t val);
int32_t getNumCharCategories() const; // CharCategories are the same as input symbol set to the
// runtime state machine, which are the same as
// columns in the DFA state table
int32_t getTrieSize() /*const*/; // Size in bytes of the serialized Trie.
void serializeTrie(uint8_t *where); // write out the serialized Trie.
UChar32 getFirstChar(int32_t val) const;
UBool sawBOF() const; // Indicate whether any references to the {bof} pseudo
// character were encountered.
/**
* Merge two character categories that have been identified as having equivalent behavior.
* The ranges belonging to the second category (table column) will be added to the first.
* @param categories the pair of categories to be merged.
*/
void mergeCategories(IntPair categories);
static constexpr int32_t DICT_BIT = 0x4000;
#ifdef RBBI_DEBUG
void printSets();
void printRanges();
void printRangeGroups();
#else
#define printSets()
#define printRanges()
#define printRangeGroups()
#endif
private:
void numberSets();
RBBIRuleBuilder *fRB; // The RBBI Rule Compiler that owns us.
UErrorCode *fStatus;
RangeDescriptor *fRangeList; // Head of the linked list of RangeDescriptors
UTrie2 *fTrie; // The mapping TRIE that is the end result of processing
uint32_t fTrieSize; // the Unicode Sets.
// Groups correspond to character categories -
// groups of ranges that are in the same original UnicodeSets.
// fGroupCount is the index of the last used group.
// fGroupCount+1 is also the number of columns in the RBBI state table being compiled.
// State table column 0 is not used. Column 1 is for end-of-input.
// column 2 is for group 0. Funny counting.
int32_t fGroupCount;
UBool fSawBOF;
RBBISetBuilder(const RBBISetBuilder &other); // forbid copying of this class
RBBISetBuilder &operator=(const RBBISetBuilder &other); // forbid copying of this class
};
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_BREAK_ITERATION */
#endif
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