icuSources/extra/scrptrun/scrptrun.h

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4  *******************************************************************************
   5  *
   6  *   Copyright (C) 1999-2003, International Business Machines
   7  *   Corporation and others.  All Rights Reserved.
   8  *
   9  *******************************************************************************
  10  *   file name:  scrptrun.h
  11  *
  12  *   created on: 10/17/2001
  13  *   created by: Eric R. Mader
  14  */
  15
  16 #ifndef __SCRPTRUN_H
  17 #define __SCRPTRUN_H
  18
  19 #include "unicode/utypes.h"
  20 #include "unicode/uobject.h"
  21 #include "unicode/uscript.h"
  22
  23 struct ScriptRecord
  24 {
  25     UChar32 startChar;
  26     UChar32 endChar;
  27     UScriptCode scriptCode;
  28 };
  29
  30 struct ParenStackEntry
  31 {
  32     int32_t pairIndex;
  33     UScriptCode scriptCode;
  34 };
  35
  36 class ScriptRun : public UObject {
  37 public:
  38     ScriptRun();
  39
  40     ScriptRun(const UChar chars[], int32_t length);
  41
  42     ScriptRun(const UChar chars[], int32_t start, int32_t length);
  43
  44     void reset();
  45
  46     void reset(int32_t start, int32_t count);
  47
  48     void reset(const UChar chars[], int32_t start, int32_t length);
  49
  50     int32_t getScriptStart();
  51
  52     int32_t getScriptEnd();
  53
  54     UScriptCode getScriptCode();
  55
  56     UBool next();
  57
  58     /**
  59      * ICU "poor man's RTTI", returns a UClassID for the actual class.
  60      *
  61      * @stable ICU 2.2
  62      */
  63     virtual inline UClassID getDynamicClassID() const { return getStaticClassID(); }
  64
  65     /**
  66      * ICU "poor man's RTTI", returns a UClassID for this class.
  67      *
  68      * @stable ICU 2.2
  69      */
  70     static inline UClassID getStaticClassID() { return (UClassID)&fgClassID; }
  71
  72 private:
  73
  74     static UBool sameScript(int32_t scriptOne, int32_t scriptTwo);
  75
  76     int32_t charStart;
  77     int32_t charLimit;
  78     const UChar *charArray;
  79
  80     int32_t scriptStart;
  81     int32_t scriptEnd;
  82     UScriptCode scriptCode;
  83
  84     ParenStackEntry parenStack[128];
  85     int32_t parenSP;
  86
  87     static int8_t highBit(int32_t value);
  88     static int32_t getPairIndex(UChar32 ch);
  89
  90     static UChar32 pairedChars[];
  91     static const int32_t pairedCharCount;
  92     static const int32_t pairedCharPower;
  93     static const int32_t pairedCharExtra;
  94
  95     /**
  96      * The address of this static class variable serves as this class's ID
  97      * for ICU "poor man's RTTI".
  98      */
  99     static const char fgClassID;
 100 };
 101
 102 inline ScriptRun::ScriptRun()
 103 {
 104     reset(NULL, 0, 0);
 105 }
 106
 107 inline ScriptRun::ScriptRun(const UChar chars[], int32_t length)
 108 {
 109     reset(chars, 0, length);
 110 }
 111
 112 inline ScriptRun::ScriptRun(const UChar chars[], int32_t start, int32_t length)
 113 {
 114     reset(chars, start, length);
 115 }
 116
 117 inline int32_t ScriptRun::getScriptStart()
 118 {
 119     return scriptStart;
 120 }
 121
 122 inline int32_t ScriptRun::getScriptEnd()
 123 {
 124     return scriptEnd;
 125 }
 126
 127 inline UScriptCode ScriptRun::getScriptCode()
 128 {
 129     return scriptCode;
 130 }
 131
 132 inline void ScriptRun::reset()
 133 {
 134     scriptStart = charStart;
 135     scriptEnd   = charStart;
 136     scriptCode  = USCRIPT_INVALID_CODE;
 137     parenSP     = -1;
 138 }
 139
 140 inline void ScriptRun::reset(int32_t start, int32_t length)
 141 {
 142     charStart = start;
 143     charLimit = start + length;
 144
 145     reset();
 146 }
 147
 148 inline void ScriptRun::reset(const UChar chars[], int32_t start, int32_t length)
 149 {
 150     charArray = chars;
 151
 152     reset(start, length);
 153 }
 154
 155
 156 #endif