//
//  rbbirb.h
//
//  Copyright (C) 2002, International Business Machines Corporation and others.
//  All Rights Reserved.
//
//  This file contains declarations for several from the Rule Based Break Iterator rule builder.
//


#ifndef RBBIRB_H
#define RBBIRB_H

#include "unicode/utypes.h"
#include "unicode/uobject.h"
#include "unicode/rbbi.h"
#include "unicode/uniset.h"
#include "unicode/parseerr.h"
#include "uhash.h"
#include "uvector.h"
#include "symtable.h"     // For UnicodeSet parsing, is the interface that
                          //    looks up references to $variables within a set.


U_NAMESPACE_BEGIN

class               RBBIRuleScanner;
struct              RBBIRuleTableEl;
class               RBBISetBuilder;
class               RBBINode;
class               RBBITableBuilder;


//--------------------------------------------------------------------------------
//
//   RBBISymbolTable.    Implements SymbolTable interface that is used by the
//                       UnicodeSet parser to resolve references to $variables.
//
//--------------------------------------------------------------------------------
class RBBISymbolTableEntry : public UObject { // The symbol table hash table contains one
public:                                       //   of these structs for each entry.
    UnicodeString          key;
    RBBINode               *val;
    ~RBBISymbolTableEntry();

    /**
     * ICU "poor man's RTTI", returns a UClassID for the actual class.
     *
     * @draft ICU 2.2
     */
    virtual inline UClassID getDynamicClassID() const { return getStaticClassID(); }

    /**
     * ICU "poor man's RTTI", returns a UClassID for this class.
     *
     * @draft ICU 2.2
     */
    static inline UClassID getStaticClassID() { return (UClassID)&fgClassID; }

private:
    /**
     * The address of this static class variable serves as this class's ID
     * for ICU "poor man's RTTI".
     */
    static const char fgClassID;
};


class RBBISymbolTable : public SymbolTable {
private:
    const UnicodeString      &fRules;
    UHashtable               *fHashTable;
    RBBIRuleScanner          *fRuleScanner;

    // These next two fields are part of the mechanism for passing references to
    //   already-constructed UnicodeSets back to the UnicodeSet constructor
    //   when the pattern includes $variable references.
    const UnicodeString      ffffString;      // = "/uffff"
    UnicodeSet              *fCachedSetLookup;

public:
    //  API inherited from class SymbolTable
    virtual const UnicodeString*  lookup(const UnicodeString& s) const;
    virtual const UnicodeFunctor* lookupMatcher(UChar32 ch) const;
    virtual UnicodeString parseReference(const UnicodeString& text,
                                         ParsePosition& pos, int32_t limit) const;

    //  Additional Functions
    RBBISymbolTable(RBBIRuleScanner *, const UnicodeString &fRules, UErrorCode &status);
    virtual ~RBBISymbolTable();

    virtual RBBINode *lookupNode(const UnicodeString &key) const;
    virtual void      addEntry  (const UnicodeString &key, RBBINode *val, UErrorCode &err);

    virtual void      print() const;

    /**
     * ICU "poor man's RTTI", returns a UClassID for the actual class.
     *
     * @draft ICU 2.2
     */
    virtual inline UClassID getDynamicClassID() const { return getStaticClassID(); }

    /**
     * ICU "poor man's RTTI", returns a UClassID for this class.
     *
     * @draft ICU 2.2
     */
    static inline UClassID getStaticClassID() { return (UClassID)&fgClassID; }

private:

    /**
     * The address of this static class variable serves as this class's ID
     * for ICU "poor man's RTTI".
     */
    static const char fgClassID;
};


//--------------------------------------------------------------------------------
//
//  class RBBIRuleBuilder       The top-level class handling RBBI rule compiling.
//
//--------------------------------------------------------------------------------
class RBBIRuleBuilder : public UObject {
public:

    //  Create a rule based break iterator from a set of rules.
    //  This function is the main entry point into the rule builder.  The
    //   public ICU API for creating RBBIs uses this function to do the actual work.
    //
    static BreakIterator * createRuleBasedBreakIterator( const UnicodeString    &rules,
                                    UParseError      &parseError,
                                    UErrorCode       &status);

    /**
     * ICU "poor man's RTTI", returns a UClassID for the actual class.
     *
     * @draft ICU 2.2
     */
    virtual inline UClassID getDynamicClassID() const { return getStaticClassID(); }

    /**
     * ICU "poor man's RTTI", returns a UClassID for this class.
     *
     * @draft ICU 2.2
     */
    static inline UClassID getStaticClassID() { return (UClassID)&fgClassID; }

public:
    // The "public" functions and data members that appear below are accessed
    //  (and shared) by the various parts that make up the rule builder.  They
    //  are NOT intended to be accessed by anything outside of the
    //  rule builder implementation.
    RBBIRuleBuilder(const UnicodeString  &rules,
                    UParseError          &parseErr,
                    UErrorCode           &status
        );

    virtual    ~RBBIRuleBuilder();
    char                          *fDebugEnv;        // controls debug trace output
    UErrorCode                    *fStatus;          // Error reporting.  Keeping status
    UParseError                   *fParseError;      //   here avoids passing it everywhere.
    const UnicodeString           &fRules;           // The rule string that we are compiling

    RBBIRuleScanner               *fScanner;         // The scanner.
    RBBINode                      *fForwardTree;     // The parse trees, generated by the scanner,
    RBBINode                      *fReverseTree;     //   then manipulated by subsequent steps.

    RBBISetBuilder                *fSetBuilder;      // Set and Character Category builder.
    RBBINode                      *fSetsListHead;    // Head of the linked list of UnicodeSets
                                                     //   (uset nodes.)

    RBBITableBuilder              *fForwardTables;   // State transition tables
    RBBITableBuilder              *fReverseTables;

    RBBIDataHeader                *flattenData();    // Create the flattened (runtime format)
                                                     // data tables..
private:
    /**
     * The address of this static class variable serves as this class's ID
     * for ICU "poor man's RTTI".
     */
    static const char fgClassID;
};


//----------------------------------------------------------------------------
//
//   RBBISetTableEl   is an entry in the hash table of UnicodeSets that have
//                    been encountered.  The val Node will be of nodetype uset
//                    and contain pointers to the actual UnicodeSets.
//                    The Key is the source string for initializing the set.
//
//                    The hash table is used to avoid creating duplicate
//                    unnamed (not $var references) UnicodeSets.
//
//                    Memory Management:
//                       The Hash Table owns these RBBISetTableEl structs and
//                            the key strings.  It does NOT own the val nodes.
//
//----------------------------------------------------------------------------
struct RBBISetTableEl {
    UnicodeString *key;
    RBBINode      *val;
};


//----------------------------------------------------------------------------
//
//   RBBIDebugPrintf    Printf equivalent, for debugging output.
//                      Conditional compilation of the implementation lets us
//                      get rid of the stdio dependency in environments where it
//                      is unavailable.
//
//----------------------------------------------------------------------------
void RBBIDebugPrintf(const char *fmt, ...);

U_NAMESPACE_END
#endif