xref: /PHP-8.2/ext/pcre/pcre2lib/pcre2_tables.c (revision 32cceb75)
1 /*************************************************
2 *      Perl-Compatible Regular Expressions       *
3 *************************************************/
4 
5 /* PCRE is a library of functions to support regular expressions whose syntax
6 and semantics are as close as possible to those of the Perl 5 language.
7 
8                        Written by Philip Hazel
9      Original API code Copyright (c) 1997-2012 University of Cambridge
10           New API code Copyright (c) 2016-2021 University of Cambridge
11 
12 -----------------------------------------------------------------------------
13 Redistribution and use in source and binary forms, with or without
14 modification, are permitted provided that the following conditions are met:
15 
16     * Redistributions of source code must retain the above copyright notice,
17       this list of conditions and the following disclaimer.
18 
19     * Redistributions in binary form must reproduce the above copyright
20       notice, this list of conditions and the following disclaimer in the
21       documentation and/or other materials provided with the distribution.
22 
23     * Neither the name of the University of Cambridge nor the names of its
24       contributors may be used to endorse or promote products derived from
25       this software without specific prior written permission.
26 
27 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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29 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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36 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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38 -----------------------------------------------------------------------------
39 */
40 
41 /* This module contains some fixed tables that are used by more than one of the
42 PCRE2 code modules. The tables are also #included by the pcre2test program,
43 which uses macros to change their names from _pcre2_xxx to xxxx, thereby
44 avoiding name clashes with the library. In this case, PCRE2_PCRE2TEST is
45 defined. */
46 
47 #ifndef PCRE2_PCRE2TEST           /* We're compiling the library */
48 #ifdef HAVE_CONFIG_H
49 #include "config.h"
50 #endif
51 #include "pcre2_internal.h"
52 #endif /* PCRE2_PCRE2TEST */
53 
54 /* Table of sizes for the fixed-length opcodes. It's defined in a macro so that
55 the definition is next to the definition of the opcodes in pcre2_internal.h.
56 This is mode-dependent, so it is skipped when this file is included by
57 pcre2test. */
58 
59 #ifndef PCRE2_PCRE2TEST
60 const uint8_t PRIV(OP_lengths)[] = { OP_LENGTHS };
61 #endif
62 
63 /* Tables of horizontal and vertical whitespace characters, suitable for
64 adding to classes. */
65 
66 const uint32_t PRIV(hspace_list)[] = { HSPACE_LIST };
67 const uint32_t PRIV(vspace_list)[] = { VSPACE_LIST };
68 
69 /* These tables are the pairs of delimiters that are valid for callout string
70 arguments. For each starting delimiter there must be a matching ending
71 delimiter, which in fact is different only for bracket-like delimiters. */
72 
73 const uint32_t PRIV(callout_start_delims)[] = {
74   CHAR_GRAVE_ACCENT, CHAR_APOSTROPHE, CHAR_QUOTATION_MARK,
75   CHAR_CIRCUMFLEX_ACCENT, CHAR_PERCENT_SIGN, CHAR_NUMBER_SIGN,
76   CHAR_DOLLAR_SIGN, CHAR_LEFT_CURLY_BRACKET, 0 };
77 
78 const uint32_t PRIV(callout_end_delims[]) = {
79   CHAR_GRAVE_ACCENT, CHAR_APOSTROPHE, CHAR_QUOTATION_MARK,
80   CHAR_CIRCUMFLEX_ACCENT, CHAR_PERCENT_SIGN, CHAR_NUMBER_SIGN,
81   CHAR_DOLLAR_SIGN, CHAR_RIGHT_CURLY_BRACKET, 0 };
82 
83 
84 /*************************************************
85 *           Tables for UTF-8 support             *
86 *************************************************/
87 
88 /* These tables are required by pcre2test in 16- or 32-bit mode, as well
89 as for the library in 8-bit mode, because pcre2test uses UTF-8 internally for
90 handling wide characters. */
91 
92 #if defined PCRE2_PCRE2TEST || \
93    (defined SUPPORT_UNICODE && \
94     defined PCRE2_CODE_UNIT_WIDTH && \
95     PCRE2_CODE_UNIT_WIDTH == 8)
96 
97 /* These are the breakpoints for different numbers of bytes in a UTF-8
98 character. */
99 
100 const int PRIV(utf8_table1)[] =
101   { 0x7f, 0x7ff, 0xffff, 0x1fffff, 0x3ffffff, 0x7fffffff};
102 
103 const int PRIV(utf8_table1_size) = sizeof(PRIV(utf8_table1)) / sizeof(int);
104 
105 /* These are the indicator bits and the mask for the data bits to set in the
106 first byte of a character, indexed by the number of additional bytes. */
107 
108 const int PRIV(utf8_table2)[] = { 0,    0xc0, 0xe0, 0xf0, 0xf8, 0xfc};
109 const int PRIV(utf8_table3)[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
110 
111 /* Table of the number of extra bytes, indexed by the first byte masked with
112 0x3f. The highest number for a valid UTF-8 first byte is in fact 0x3d. */
113 
114 const uint8_t PRIV(utf8_table4)[] = {
115   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
116   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
117   2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
118   3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
119 
120 #endif /* UTF-8 support needed */
121 
122 /* Tables concerned with Unicode properties are relevant only when Unicode
123 support is enabled. See also the pcre2_ucptables.c file, which is generated by
124 a Python script from Unicode data files. */
125 
126 #ifdef SUPPORT_UNICODE
127 
128 /* Table to translate from particular type value to the general value. */
129 
130 const uint32_t PRIV(ucp_gentype)[] = {
131   ucp_C, ucp_C, ucp_C, ucp_C, ucp_C,  /* Cc, Cf, Cn, Co, Cs */
132   ucp_L, ucp_L, ucp_L, ucp_L, ucp_L,  /* Ll, Lu, Lm, Lo, Lt */
133   ucp_M, ucp_M, ucp_M,                /* Mc, Me, Mn */
134   ucp_N, ucp_N, ucp_N,                /* Nd, Nl, No */
135   ucp_P, ucp_P, ucp_P, ucp_P, ucp_P,  /* Pc, Pd, Pe, Pf, Pi */
136   ucp_P, ucp_P,                       /* Ps, Po */
137   ucp_S, ucp_S, ucp_S, ucp_S,         /* Sc, Sk, Sm, So */
138   ucp_Z, ucp_Z, ucp_Z                 /* Zl, Zp, Zs */
139 };
140 
141 /* This table encodes the rules for finding the end of an extended grapheme
142 cluster. Every code point has a grapheme break property which is one of the
143 ucp_gbXX values defined in pcre2_ucp.h. These changed between Unicode versions
144 10 and 11. The 2-dimensional table is indexed by the properties of two adjacent
145 code points. The left property selects a word from the table, and the right
146 property selects a bit from that word like this:
147 
148   PRIV(ucp_gbtable)[left-property] & (1u << right-property)
149 
150 The value is non-zero if a grapheme break is NOT permitted between the relevant
151 two code points. The breaking rules are as follows:
152 
153 1. Break at the start and end of text (pretty obviously).
154 
155 2. Do not break between a CR and LF; otherwise, break before and after
156    controls.
157 
158 3. Do not break Hangul syllable sequences, the rules for which are:
159 
160     L may be followed by L, V, LV or LVT
161     LV or V may be followed by V or T
162     LVT or T may be followed by T
163 
164 4. Do not break before extending characters or zero-width-joiner (ZWJ).
165 
166 The following rules are only for extended grapheme clusters (but that's what we
167 are implementing).
168 
169 5. Do not break before SpacingMarks.
170 
171 6. Do not break after Prepend characters.
172 
173 7. Do not break within emoji modifier sequences or emoji zwj sequences. That
174    is, do not break between characters with the Extended_Pictographic property.
175    Extend and ZWJ characters are allowed between the characters; this cannot be
176    represented in this table, the code has to deal with it.
177 
178 8. Do not break within emoji flag sequences. That is, do not break between
179    regional indicator (RI) symbols if there are an odd number of RI characters
180    before the break point. This table encodes "join RI characters"; the code
181    has to deal with checking for previous adjoining RIs.
182 
183 9. Otherwise, break everywhere.
184 */
185 
186 #define ESZ (1<<ucp_gbExtend)|(1<<ucp_gbSpacingMark)|(1<<ucp_gbZWJ)
187 
188 const uint32_t PRIV(ucp_gbtable)[] = {
189    (1u<<ucp_gbLF),                                      /*  0 CR */
190    0,                                                   /*  1 LF */
191    0,                                                   /*  2 Control */
192    ESZ,                                                 /*  3 Extend */
193    ESZ|(1u<<ucp_gbPrepend)|                             /*  4 Prepend */
194        (1u<<ucp_gbL)|(1u<<ucp_gbV)|(1u<<ucp_gbT)|
195        (1u<<ucp_gbLV)|(1u<<ucp_gbLVT)|(1u<<ucp_gbOther)|
196        (1u<<ucp_gbRegional_Indicator),
197    ESZ,                                                 /*  5 SpacingMark */
198    ESZ|(1u<<ucp_gbL)|(1u<<ucp_gbV)|(1u<<ucp_gbLV)|      /*  6 L */
199        (1u<<ucp_gbLVT),
200    ESZ|(1u<<ucp_gbV)|(1u<<ucp_gbT),                     /*  7 V */
201    ESZ|(1u<<ucp_gbT),                                   /*  8 T */
202    ESZ|(1u<<ucp_gbV)|(1u<<ucp_gbT),                     /*  9 LV */
203    ESZ|(1u<<ucp_gbT),                                   /* 10 LVT */
204    (1u<<ucp_gbRegional_Indicator),                      /* 11 Regional Indicator */
205    ESZ,                                                 /* 12 Other */
206    ESZ,                                                 /* 13 ZWJ */
207    ESZ|(1u<<ucp_gbExtended_Pictographic)                /* 14 Extended Pictographic */
208 };
209 
210 #undef ESZ
211 
212 #ifdef SUPPORT_JIT
213 /* This table reverses PRIV(ucp_gentype). We can save the cost
214 of a memory load. */
215 
216 const int PRIV(ucp_typerange)[] = {
217   ucp_Cc, ucp_Cs,
218   ucp_Ll, ucp_Lu,
219   ucp_Mc, ucp_Mn,
220   ucp_Nd, ucp_No,
221   ucp_Pc, ucp_Ps,
222   ucp_Sc, ucp_So,
223   ucp_Zl, ucp_Zs,
224 };
225 #endif /* SUPPORT_JIT */
226 
227 /* Finally, include the tables that are auto-generated from the Unicode data
228 files. */
229 
230 #include "pcre2_ucptables.c"
231 
232 #endif /* SUPPORT_UNICODE */
233 
234 /* End of pcre2_tables.c */
235