1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 * Copyright (C) 2011, International Business Machines
6 * Corporation and others. All Rights Reserved.
7 *******************************************************************************
8 * file name: patternprops.cpp
9 * encoding: UTF-8
10 * tab size: 8 (not used)
11 * indentation:4
12 *
13 * created on: 2011mar13
14 * created by: Markus W. Scherer
15 */
16
17 #include "unicode/utypes.h"
18 #include "patternprops.h"
19
20 U_NAMESPACE_BEGIN
21
22 /*
23 * One byte per Latin-1 character.
24 * Bit 0 is set if either Pattern property is true,
25 * bit 1 if Pattern_Syntax is true,
26 * bit 2 if Pattern_White_Space is true.
27 * That is, Pattern_Syntax is encoded as 3 and Pattern_White_Space as 5.
28 */
29 static const uint8_t latin1[256]={
30 // WS: 9..D
31 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 5, 5, 5, 5, 0, 0,
32 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
33 // WS: 20 Syntax: 21..2F
34 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
35 // Syntax: 3A..40
36 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3,
37 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
38 // Syntax: 5B..5E
39 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 0,
40 // Syntax: 60
41 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
42 // Syntax: 7B..7E
43 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 0,
44 // WS: 85
45 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
46 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
47 // Syntax: A1..A7, A9, AB, AC, AE
48 0, 3, 3, 3, 3, 3, 3, 3, 0, 3, 0, 3, 3, 0, 3, 0,
49 // Syntax: B0, B1, B6, BB, BF
50 3, 3, 0, 0, 0, 0, 3, 0, 0, 0, 0, 3, 0, 0, 0, 3,
51 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
52 // Syntax: D7
53 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0,
54 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
55 // Syntax: F7
56 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0
57 };
58
59 /*
60 * One byte per 32 characters from U+2000..U+303F indexing into
61 * a small table of 32-bit data words.
62 * The first two data words are all-zeros and all-ones.
63 */
64 static const uint8_t index2000[130]={
65 2, 3, 4, 0, 0, 0, 0, 0, // 20xx
66 0, 0, 0, 0, 5, 1, 1, 1, // 21xx
67 1, 1, 1, 1, 1, 1, 1, 1, // 22xx
68 1, 1, 1, 1, 1, 1, 1, 1, // 23xx
69 1, 1, 1, 0, 0, 0, 0, 0, // 24xx
70 1, 1, 1, 1, 1, 1, 1, 1, // 25xx
71 1, 1, 1, 1, 1, 1, 1, 1, // 26xx
72 1, 1, 1, 6, 7, 1, 1, 1, // 27xx
73 1, 1, 1, 1, 1, 1, 1, 1, // 28xx
74 1, 1, 1, 1, 1, 1, 1, 1, // 29xx
75 1, 1, 1, 1, 1, 1, 1, 1, // 2Axx
76 1, 1, 1, 1, 1, 1, 1, 1, // 2Bxx
77 0, 0, 0, 0, 0, 0, 0, 0, // 2Cxx
78 0, 0, 0, 0, 0, 0, 0, 0, // 2Dxx
79 1, 1, 1, 1, 0, 0, 0, 0, // 2Exx
80 0, 0, 0, 0, 0, 0, 0, 0, // 2Fxx
81 8, 9 // 3000..303F
82 };
83
84 /*
85 * One 32-bit integer per 32 characters. Ranges of all-false and all-true
86 * are mapped to the first two values, other ranges map to appropriate bit patterns.
87 */
88 static const uint32_t syntax2000[]={
89 0,
90 0xffffffff,
91 0xffff0000, // 2: 2010..201F
92 0x7fff00ff, // 3: 2020..2027, 2030..203E
93 0x7feffffe, // 4: 2041..2053, 2055..205E
94 0xffff0000, // 5: 2190..219F
95 0x003fffff, // 6: 2760..2775
96 0xfff00000, // 7: 2794..279F
97 0xffffff0e, // 8: 3001..3003, 3008..301F
98 0x00010001 // 9: 3020, 3030
99 };
100
101 /*
102 * Same as syntax2000, but with additional bits set for the
103 * Pattern_White_Space characters 200E 200F 2028 2029.
104 */
105 static const uint32_t syntaxOrWhiteSpace2000[]={
106 0,
107 0xffffffff,
108 0xffffc000, // 2: 200E..201F
109 0x7fff03ff, // 3: 2020..2029, 2030..203E
110 0x7feffffe, // 4: 2041..2053, 2055..205E
111 0xffff0000, // 5: 2190..219F
112 0x003fffff, // 6: 2760..2775
113 0xfff00000, // 7: 2794..279F
114 0xffffff0e, // 8: 3001..3003, 3008..301F
115 0x00010001 // 9: 3020, 3030
116 };
117
118 UBool
isSyntax(UChar32 c)119 PatternProps::isSyntax(UChar32 c) {
120 if(c<0) {
121 return FALSE;
122 } else if(c<=0xff) {
123 return (UBool)(latin1[c]>>1)&1;
124 } else if(c<0x2010) {
125 return FALSE;
126 } else if(c<=0x3030) {
127 uint32_t bits=syntax2000[index2000[(c-0x2000)>>5]];
128 return (UBool)((bits>>(c&0x1f))&1);
129 } else if(0xfd3e<=c && c<=0xfe46) {
130 return c<=0xfd3f || 0xfe45<=c;
131 } else {
132 return FALSE;
133 }
134 }
135
136 UBool
isSyntaxOrWhiteSpace(UChar32 c)137 PatternProps::isSyntaxOrWhiteSpace(UChar32 c) {
138 if(c<0) {
139 return FALSE;
140 } else if(c<=0xff) {
141 return (UBool)(latin1[c]&1);
142 } else if(c<0x200e) {
143 return FALSE;
144 } else if(c<=0x3030) {
145 uint32_t bits=syntaxOrWhiteSpace2000[index2000[(c-0x2000)>>5]];
146 return (UBool)((bits>>(c&0x1f))&1);
147 } else if(0xfd3e<=c && c<=0xfe46) {
148 return c<=0xfd3f || 0xfe45<=c;
149 } else {
150 return FALSE;
151 }
152 }
153
154 UBool
isWhiteSpace(UChar32 c)155 PatternProps::isWhiteSpace(UChar32 c) {
156 if(c<0) {
157 return FALSE;
158 } else if(c<=0xff) {
159 return (UBool)(latin1[c]>>2)&1;
160 } else if(0x200e<=c && c<=0x2029) {
161 return c<=0x200f || 0x2028<=c;
162 } else {
163 return FALSE;
164 }
165 }
166
167 const UChar *
skipWhiteSpace(const UChar * s,int32_t length)168 PatternProps::skipWhiteSpace(const UChar *s, int32_t length) {
169 while(length>0 && isWhiteSpace(*s)) {
170 ++s;
171 --length;
172 }
173 return s;
174 }
175
176 const UChar *
trimWhiteSpace(const UChar * s,int32_t & length)177 PatternProps::trimWhiteSpace(const UChar *s, int32_t &length) {
178 if(length<=0 || (!isWhiteSpace(s[0]) && !isWhiteSpace(s[length-1]))) {
179 return s;
180 }
181 int32_t start=0;
182 int32_t limit=length;
183 while(start<limit && isWhiteSpace(s[start])) {
184 ++start;
185 }
186 if(start<limit) {
187 // There is non-white space at start; we will not move limit below that,
188 // so we need not test start<limit in the loop.
189 while(isWhiteSpace(s[limit-1])) {
190 --limit;
191 }
192 }
193 length=limit-start;
194 return s+start;
195 }
196
197 UBool
isIdentifier(const UChar * s,int32_t length)198 PatternProps::isIdentifier(const UChar *s, int32_t length) {
199 if(length<=0) {
200 return FALSE;
201 }
202 const UChar *limit=s+length;
203 do {
204 if(isSyntaxOrWhiteSpace(*s++)) {
205 return FALSE;
206 }
207 } while(s<limit);
208 return TRUE;
209 }
210
211 const UChar *
skipIdentifier(const UChar * s,int32_t length)212 PatternProps::skipIdentifier(const UChar *s, int32_t length) {
213 while(length>0 && !isSyntaxOrWhiteSpace(*s)) {
214 ++s;
215 --length;
216 }
217 return s;
218 }
219
220 U_NAMESPACE_END
221