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[apple/icu.git] / 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 U_NAMESPACE_BEGIN
24
25 struct ScriptRecord
26 {
27 UChar32 startChar;
28 UChar32 endChar;
29 UScriptCode scriptCode;
30 };
31
32 struct ParenStackEntry
33 {
34 int32_t pairIndex;
35 UScriptCode scriptCode;
36 };
37
38 class ScriptRun : public UObject {
39 public:
40 ScriptRun();
41
42 ScriptRun(const UChar chars[], int32_t length);
43
44 ScriptRun(const UChar chars[], int32_t start, int32_t length);
45
46 void reset();
47
48 void reset(int32_t start, int32_t count);
49
50 void reset(const UChar chars[], int32_t start, int32_t length);
51
52 int32_t getScriptStart();
53
54 int32_t getScriptEnd();
55
56 UScriptCode getScriptCode();
57
58 UBool next();
59
60 /**
61 * ICU "poor man's RTTI", returns a UClassID for the actual class.
62 *
63 * @stable ICU 2.2
64 */
65 virtual inline UClassID getDynamicClassID() const { return getStaticClassID(); }
66
67 /**
68 * ICU "poor man's RTTI", returns a UClassID for this class.
69 *
70 * @stable ICU 2.2
71 */
72 static inline UClassID getStaticClassID() { return (UClassID)&fgClassID; }
73
74 private:
75
76 static UBool sameScript(int32_t scriptOne, int32_t scriptTwo);
77
78 int32_t charStart;
79 int32_t charLimit;
80 const UChar *charArray;
81
82 int32_t scriptStart;
83 int32_t scriptEnd;
84 UScriptCode scriptCode;
85
86 ParenStackEntry parenStack[128];
87 int32_t parenSP;
88
89 static int8_t highBit(int32_t value);
90 static int32_t getPairIndex(UChar32 ch);
91
92 static UChar32 pairedChars[];
93 static const int32_t pairedCharCount;
94 static const int32_t pairedCharPower;
95 static const int32_t pairedCharExtra;
96
97 /**
98 * The address of this static class variable serves as this class's ID
99 * for ICU "poor man's RTTI".
100 */
101 static const char fgClassID;
102 };
103
104 inline ScriptRun::ScriptRun()
105 {
106 reset(NULL, 0, 0);
107 }
108
109 inline ScriptRun::ScriptRun(const UChar chars[], int32_t length)
110 {
111 reset(chars, 0, length);
112 }
113
114 inline ScriptRun::ScriptRun(const UChar chars[], int32_t start, int32_t length)
115 {
116 reset(chars, start, length);
117 }
118
119 inline int32_t ScriptRun::getScriptStart()
120 {
121 return scriptStart;
122 }
123
124 inline int32_t ScriptRun::getScriptEnd()
125 {
126 return scriptEnd;
127 }
128
129 inline UScriptCode ScriptRun::getScriptCode()
130 {
131 return scriptCode;
132 }
133
134 inline void ScriptRun::reset()
135 {
136 scriptStart = charStart;
137 scriptEnd = charStart;
138 scriptCode = USCRIPT_INVALID_CODE;
139 parenSP = -1;
140 }
141
142 inline void ScriptRun::reset(int32_t start, int32_t length)
143 {
144 charStart = start;
145 charLimit = start + length;
146
147 reset();
148 }
149
150 inline void ScriptRun::reset(const UChar chars[], int32_t start, int32_t length)
151 {
152 charArray = chars;
153
154 reset(start, length);
155 }
156
157 U_NAMESPACE_END
158
159 #endif
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