icuSources/common/rbbisetb.h

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 //
   4 //  rbbisetb.h
   5 /*
   6 **********************************************************************
   7 *   Copyright (c) 2001-2005, International Business Machines
   8 *   Corporation and others.  All Rights Reserved.
   9 **********************************************************************
  10 */
  11
  12 #ifndef RBBISETB_H
  13 #define RBBISETB_H
  14
  15 #include "unicode/utypes.h"
  16 #include "unicode/uobject.h"
  17 #include "rbbirb.h"
  18 #include "uvector.h"
  19
  20 struct  UNewTrie;
  21
  22 U_NAMESPACE_BEGIN
  23
  24 //
  25 //  RBBISetBuilder   Derives the character categories used by the runtime RBBI engine
  26 //                   from the Unicode Sets appearing in the source  RBBI rules, and
  27 //                   creates the TRIE table used to map from Unicode to the
  28 //                   character categories.
  29 //
  30
  31
  32 //
  33 //  RangeDescriptor
  34 //
  35 //     Each of the non-overlapping character ranges gets one of these descriptors.
  36 //     All of them are strung together in a linked list, which is kept in order
  37 //     (by character)
  38 //
  39 class RangeDescriptor : public UMemory {
  40 public:
  41     UChar32            fStartChar;      // Start of range, unicode 32 bit value.
  42     UChar32            fEndChar;        // End of range, unicode 32 bit value.
  43     int32_t            fNum;            // runtime-mapped input value for this range.
  44     UVector           *fIncludesSets;   // vector of the the original
  45                                         //   Unicode sets that include this range.
  46                                         //    (Contains ptrs to uset nodes)
  47     RangeDescriptor   *fNext;           // Next RangeDescriptor in the linked list.
  48
  49     RangeDescriptor(UErrorCode &status);
  50     RangeDescriptor(const RangeDescriptor &other, UErrorCode &status);
  51     ~RangeDescriptor();
  52     void split(UChar32 where, UErrorCode &status);   // Spit this range in two at "where", with
  53                                         //   where appearing in the second (higher) part.
  54     void setDictionaryFlag();           // Check whether this range appears as part of
  55                                         //   the Unicode set named "dictionary"
  56
  57 private:
  58     RangeDescriptor(const RangeDescriptor &other); // forbid copying of this class
  59     RangeDescriptor &operator=(const RangeDescriptor &other); // forbid copying of this class
  60 };
  61
  62
  63 //
  64 //  RBBISetBuilder   Handles processing of Unicode Sets from RBBI rules.
  65 //
  66 //      Starting with the rules parse tree from the scanner,
  67 //
  68 //                   -  Enumerate the set of UnicodeSets that are referenced
  69 //                      by the RBBI rules.
  70 //                   -  compute a derived set of non-overlapping UnicodeSets
  71 //                      that will correspond to columns in the state table for
  72 //                      the RBBI execution engine.
  73 //                   -  construct the trie table that maps input characters
  74 //                      to set numbers in the non-overlapping set of sets.
  75 //
  76
  77
  78 class RBBISetBuilder : public UMemory {
  79 public:
  80     RBBISetBuilder(RBBIRuleBuilder *rb);
  81     ~RBBISetBuilder();
  82
  83     void     build();
  84     void     addValToSets(UVector *sets,      uint32_t val);
  85     void     addValToSet (RBBINode *usetNode, uint32_t val);
  86     int32_t  getNumCharCategories() const;   // CharCategories are the same as input symbol set to the
  87                                              //    runtime state machine, which are the same as
  88                                              //    columns in the DFA state table
  89     int32_t  getTrieSize() /*const*/;        // Size in bytes of the serialized Trie.
  90     void     serializeTrie(uint8_t *where);  // write out the serialized Trie.
  91     UChar32  getFirstChar(int32_t  val) const;
  92     UBool    sawBOF() const;                 // Indicate whether any references to the {bof} pseudo
  93                                              //   character were encountered.
  94 #ifdef RBBI_DEBUG
  95     void     printSets();
  96     void     printRanges();
  97     void     printRangeGroups();
  98 #else
  99     #define printSets()
 100     #define printRanges()
 101     #define printRangeGroups()
 102 #endif
 103
 104 private:
 105     void           numberSets();
 106
 107     RBBIRuleBuilder       *fRB;             // The RBBI Rule Compiler that owns us.
 108     UErrorCode            *fStatus;
 109
 110     RangeDescriptor       *fRangeList;      // Head of the linked list of RangeDescriptors
 111
 112     UNewTrie              *fTrie;           // The mapping TRIE that is the end result of processing
 113     uint32_t              fTrieSize;        //  the Unicode Sets.
 114
 115     // Groups correspond to character categories -
 116     //       groups of ranges that are in the same original UnicodeSets.
 117     //       fGroupCount is the index of the last used group.
 118     //       fGroupCount+1 is also the number of columns in the RBBI state table being compiled.
 119     //       State table column 0 is not used.  Column 1 is for end-of-input.
 120     //       column 2 is for group 0.  Funny counting.
 121     int32_t               fGroupCount;
 122
 123     UBool                 fSawBOF;
 124
 125     RBBISetBuilder(const RBBISetBuilder &other); // forbid copying of this class
 126     RBBISetBuilder &operator=(const RBBISetBuilder &other); // forbid copying of this class
 127 };
 128
 129
 130
 131 U_NAMESPACE_END
 132 #endif