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//
// rbbitblb.h
//
/*
**********************************************************************
* Copyright (c) 2002, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
*/
#ifndef RBBITBLB_H
#define RBBITBLB_H
#include "unicode/utypes.h"
#include "unicode/uobject.h"
#include "unicode/rbbi.h"
#include "rbbinode.h"
U_NAMESPACE_BEGIN
class RBBIRuleScanner;
class RBBIRuleBuilder;
//
// class RBBITableBuilder is part of the RBBI rule compiler.
// It builds the state transition table used by the RBBI runtime
// from the expression syntax tree generated by the rule scanner.
//
// This class is part of the RBBI implementation only.
// There is no user-visible public API here.
//
class RBBITableBuilder : public UMemory {
public:
RBBITableBuilder(RBBIRuleBuilder *rb, RBBINode **rootNode);
~RBBITableBuilder();
void build();
int32_t getTableSize(); // Return the runtime size in bytes of
// the built state table
void exportTable(void *where); // fill in the runtime state table.
// Sufficient memory must exist at
// the specified location.
private:
void calcNullable(RBBINode *n);
void calcFirstPos(RBBINode *n);
void calcLastPos(RBBINode *n);
void calcFollowPos(RBBINode *n);
void calcChainedFollowPos(RBBINode *n);
void buildStateTable();
void flagAcceptingStates();
void flagLookAheadStates();
void flagTaggedStates();
// Set functions for UVector.
// TODO: make a USet subclass of UVector
void setAdd(UVector *dest, UVector *source);
UBool setEquals(UVector *a, UVector *b);
void printSet(UVector *s);
void printPosSets(RBBINode *n = NULL);
void printStates();
private:
RBBIRuleBuilder *fRB;
RBBINode *&fTree; // The root node of the parse tree to build a
// table for.
UErrorCode *fStatus;
UVector *fDStates; // D states (Aho's terminology)
// Index is state number
// Contents are RBBIStateDescriptor pointers.
RBBITableBuilder(const RBBITableBuilder &other); // forbid copying of this class
RBBITableBuilder &operator=(const RBBITableBuilder &other); // forbid copying of this class
};
//
// RBBIStateDescriptor - The DFA is constructed as a set of these descriptors,
// one for each state.
class RBBIStateDescriptor : public UMemory {
public:
UBool fMarked;
int32_t fAccepting;
int32_t fLookAhead;
int32_t fTagVal;
UVector *fPositions; // Set of parse tree positions associated
// with this state. Unordered (it's a set).
// UVector contents are RBBINode *
UVector *fDtran; // Transitions out of this state.
// indexed by input character
// contents is int index of dest state
// in RBBITableBuilder.fDStates
RBBIStateDescriptor(int maxInputSymbol, UErrorCode *fStatus);
~RBBIStateDescriptor();
private:
RBBIStateDescriptor(const RBBIStateDescriptor &other); // forbid copying of this class
RBBIStateDescriptor &operator=(const RBBIStateDescriptor &other); // forbid copying of this class
};
U_NAMESPACE_END
#endif