icuSources/common/rbbirb.h

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 //
   4 //  rbbirb.h
   5 //
   6 //  Copyright (C) 2002-2008, International Business Machines Corporation and others.
   7 //  All Rights Reserved.
   8 //
   9 //  This file contains declarations for several classes from the
  10 //    Rule Based Break Iterator rule builder.
  11 //
  12
  13
  14 #ifndef RBBIRB_H
  15 #define RBBIRB_H
  16
  17 #include "unicode/utypes.h"
  18 #include "unicode/uobject.h"
  19 #include "unicode/rbbi.h"
  20 #include "unicode/uniset.h"
  21 #include "unicode/parseerr.h"
  22 #include "uhash.h"
  23 #include "uvector.h"
  24 #include "unicode/symtable.h"// For UnicodeSet parsing, is the interface that
  25                           //    looks up references to $variables within a set.
  26
  27
  28
  29 U_NAMESPACE_BEGIN
  30
  31 class               RBBIRuleScanner;
  32 struct              RBBIRuleTableEl;
  33 class               RBBISetBuilder;
  34 class               RBBINode;
  35 class               RBBITableBuilder;
  36
  37
  38
  39 //--------------------------------------------------------------------------------
  40 //
  41 //   RBBISymbolTable.    Implements SymbolTable interface that is used by the
  42 //                       UnicodeSet parser to resolve references to $variables.
  43 //
  44 //--------------------------------------------------------------------------------
  45 class RBBISymbolTableEntry : public UMemory { // The symbol table hash table contains one
  46 public:                                       //   of these structs for each entry.
  47     RBBISymbolTableEntry();
  48     UnicodeString          key;
  49     RBBINode               *val;
  50     ~RBBISymbolTableEntry();
  51
  52 private:
  53     RBBISymbolTableEntry(const RBBISymbolTableEntry &other); // forbid copying of this class
  54     RBBISymbolTableEntry &operator=(const RBBISymbolTableEntry &other); // forbid copying of this class
  55 };
  56
  57
  58 class RBBISymbolTable : public UMemory, public SymbolTable {
  59 private:
  60     const UnicodeString      &fRules;
  61     UHashtable               *fHashTable;
  62     RBBIRuleScanner          *fRuleScanner;
  63
  64     // These next two fields are part of the mechanism for passing references to
  65     //   already-constructed UnicodeSets back to the UnicodeSet constructor
  66     //   when the pattern includes $variable references.
  67     const UnicodeString      ffffString;      // = "/uffff"
  68     UnicodeSet              *fCachedSetLookup;
  69
  70 public:
  71     //  API inherited from class SymbolTable
  72     virtual const UnicodeString*  lookup(const UnicodeString& s) const;
  73     virtual const UnicodeFunctor* lookupMatcher(UChar32 ch) const;
  74     virtual UnicodeString parseReference(const UnicodeString& text,
  75                                          ParsePosition& pos, int32_t limit) const;
  76
  77     //  Additional Functions
  78     RBBISymbolTable(RBBIRuleScanner *, const UnicodeString &fRules, UErrorCode &status);
  79     virtual ~RBBISymbolTable();
  80
  81     virtual RBBINode *lookupNode(const UnicodeString &key) const;
  82     virtual void      addEntry  (const UnicodeString &key, RBBINode *val, UErrorCode &err);
  83
  84 #ifdef RBBI_DEBUG
  85     virtual void      rbbiSymtablePrint() const;
  86 #else
  87     // A do-nothing inline function for non-debug builds.  Member funcs can't be empty
  88     //  or the call sites won't compile.
  89     int32_t fFakeField;
  90     #define rbbiSymtablePrint() fFakeField=0;
  91 #endif
  92
  93 private:
  94     RBBISymbolTable(const RBBISymbolTable &other); // forbid copying of this class
  95     RBBISymbolTable &operator=(const RBBISymbolTable &other); // forbid copying of this class
  96 };
  97
  98
  99 //--------------------------------------------------------------------------------
 100 //
 101 //  class RBBIRuleBuilder       The top-level class handling RBBI rule compiling.
 102 //
 103 //--------------------------------------------------------------------------------
 104 class RBBIRuleBuilder : public UMemory {
 105 public:
 106
 107     //  Create a rule based break iterator from a set of rules.
 108     //  This function is the main entry point into the rule builder.  The
 109     //   public ICU API for creating RBBIs uses this function to do the actual work.
 110     //
 111     static BreakIterator * createRuleBasedBreakIterator( const UnicodeString    &rules,
 112                                     UParseError      *parseError,
 113                                     UErrorCode       &status);
 114
 115 public:
 116     // The "public" functions and data members that appear below are accessed
 117     //  (and shared) by the various parts that make up the rule builder.  They
 118     //  are NOT intended to be accessed by anything outside of the
 119     //  rule builder implementation.
 120     RBBIRuleBuilder(const UnicodeString  &rules,
 121                     UParseError          *parseErr,
 122                     UErrorCode           &status
 123         );
 124
 125     virtual    ~RBBIRuleBuilder();
 126     char                          *fDebugEnv;        // controls debug trace output
 127     UErrorCode                    *fStatus;          // Error reporting.  Keeping status
 128     UParseError                   *fParseError;      //   here avoids passing it everywhere.
 129     const UnicodeString           &fRules;           // The rule string that we are compiling
 130
 131     RBBIRuleScanner               *fScanner;         // The scanner.
 132     RBBINode                      *fForwardTree;     // The parse trees, generated by the scanner,
 133     RBBINode                      *fReverseTree;     //   then manipulated by subsequent steps.
 134     RBBINode                      *fSafeFwdTree;
 135     RBBINode                      *fSafeRevTree;
 136
 137     RBBINode                      **fDefaultTree;    // For rules not qualified with a !
 138                                                      //   the tree to which they belong to.
 139
 140     UBool                         fChainRules;       // True for chained Unicode TR style rules.
 141                                                      // False for traditional regexp rules.
 142
 143     UBool                         fLBCMNoChain;      // True:  suppress chaining of rules on
 144                                                      //   chars with LineBreak property == CM.
 145
 146     UBool                         fLookAheadHardBreak;  // True:  Look ahead matches cause an
 147                                                      // immediate break, no continuing for the
 148                                                      // longest match.
 149
 150     RBBISetBuilder                *fSetBuilder;      // Set and Character Category builder.
 151     UVector                       *fUSetNodes;       // Vector of all uset nodes.
 152
 153     RBBITableBuilder              *fForwardTables;   // State transition tables
 154     RBBITableBuilder              *fReverseTables;
 155     RBBITableBuilder              *fSafeFwdTables;
 156     RBBITableBuilder              *fSafeRevTables;
 157
 158     UVector                       *fRuleStatusVals;  // The values that can be returned
 159                                                      //   from getRuleStatus().
 160
 161     RBBIDataHeader                *flattenData();    // Create the flattened (runtime format)
 162                                                      // data tables..
 163 private:
 164     RBBIRuleBuilder(const RBBIRuleBuilder &other); // forbid copying of this class
 165     RBBIRuleBuilder &operator=(const RBBIRuleBuilder &other); // forbid copying of this class
 166 };
 167
 168
 169
 170
 171 //----------------------------------------------------------------------------
 172 //
 173 //   RBBISetTableEl   is an entry in the hash table of UnicodeSets that have
 174 //                    been encountered.  The val Node will be of nodetype uset
 175 //                    and contain pointers to the actual UnicodeSets.
 176 //                    The Key is the source string for initializing the set.
 177 //
 178 //                    The hash table is used to avoid creating duplicate
 179 //                    unnamed (not $var references) UnicodeSets.
 180 //
 181 //                    Memory Management:
 182 //                       The Hash Table owns these RBBISetTableEl structs and
 183 //                            the key strings.  It does NOT own the val nodes.
 184 //
 185 //----------------------------------------------------------------------------
 186 struct RBBISetTableEl {
 187     UnicodeString *key;
 188     RBBINode      *val;
 189 };
 190
 191
 192 //----------------------------------------------------------------------------
 193 //
 194 //   RBBIDebugPrintf    Printf equivalent, for debugging output.
 195 //                      Conditional compilation of the implementation lets us
 196 //                      get rid of the stdio dependency in environments where it
 197 //                      is unavailable.
 198 //
 199 //----------------------------------------------------------------------------
 200 #ifdef RBBI_DEBUG
 201 #include <stdio.h>
 202 #define RBBIDebugPrintf printf
 203 #define RBBIDebugPuts puts
 204 #else
 205 #undef RBBIDebugPrintf
 206 #define RBBIDebugPuts(arg)
 207 #endif
 208
 209 U_NAMESPACE_END
 210 #endif
 211
 212
 213