1/* Line breaking auxiliary tables.
2   Copyright (C) 2001-2003, 2006-2010 Free Software Foundation, Inc.
3   Written by Bruno Haible <bruno@clisp.org>, 2001.
4
5   This program is free software: you can redistribute it and/or modify it
6   under the terms of the GNU Lesser General Public License as published
7   by the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18#include "unitypes.h"
19
20/* Line breaking classification.  */
21
22enum
23{
24  /* Values >= 24 are resolved at run time. */
25  LBP_BK = 24, /* mandatory break */
26/*LBP_CR,         carriage return - not used here because it's a DOSism */
27/*LBP_LF,         line feed - not used here because it's a DOSism */
28  LBP_CM = 25, /* attached characters and combining marks */
29/*LBP_NL,         next line - not used here because it's equivalent to LBP_BK */
30/*LBP_SG,         surrogates - not used here because they are not characters */
31  LBP_WJ =  0, /* word joiner */
32  LBP_ZW = 26, /* zero width space */
33  LBP_GL =  1, /* non-breaking (glue) */
34  LBP_SP = 27, /* space */
35  LBP_B2 =  2, /* break opportunity before and after */
36  LBP_BA =  3, /* break opportunity after */
37  LBP_BB =  4, /* break opportunity before */
38  LBP_HY =  5, /* hyphen */
39  LBP_CB = 28, /* contingent break opportunity */
40  LBP_CL =  6, /* closing punctuation */
41  LBP_EX =  7, /* exclamation/interrogation */
42  LBP_IN =  8, /* inseparable */
43  LBP_NS =  9, /* non starter */
44  LBP_OP = 10, /* opening punctuation */
45  LBP_QU = 11, /* ambiguous quotation */
46  LBP_IS = 12, /* infix separator (numeric) */
47  LBP_NU = 13, /* numeric */
48  LBP_PO = 14, /* postfix (numeric) */
49  LBP_PR = 15, /* prefix (numeric) */
50  LBP_SY = 16, /* symbols allowing breaks */
51  LBP_AI = 29, /* ambiguous (alphabetic or ideograph) */
52  LBP_AL = 17, /* ordinary alphabetic and symbol characters */
53  LBP_H2 = 18, /* Hangul LV syllable */
54  LBP_H3 = 19, /* Hangul LVT syllable */
55  LBP_ID = 20, /* ideographic */
56  LBP_JL = 21, /* Hangul L Jamo */
57  LBP_JV = 22, /* Hangul V Jamo */
58  LBP_JT = 23, /* Hangul T Jamo */
59  LBP_SA = 30, /* complex context (South East Asian) */
60  LBP_XX = 31  /* unknown */
61};
62
63#include "lbrkprop1.h"
64
65static inline unsigned char
66unilbrkprop_lookup (ucs4_t uc)
67{
68  unsigned int index1 = uc >> lbrkprop_header_0;
69  if (index1 < lbrkprop_header_1)
70    {
71      int lookup1 = unilbrkprop.level1[index1];
72      if (lookup1 >= 0)
73        {
74          unsigned int index2 = (uc >> lbrkprop_header_2) & lbrkprop_header_3;
75          int lookup2 = unilbrkprop.level2[lookup1 + index2];
76          if (lookup2 >= 0)
77            {
78              unsigned int index3 = uc & lbrkprop_header_4;
79              return unilbrkprop.level3[lookup2 + index3];
80            }
81        }
82    }
83  return LBP_XX;
84}
85
86/* Table indexed by two line breaking classifications.  */
87#define D 1  /* direct break opportunity, empty in table 7.3 of UTR #14 */
88#define I 2  /* indirect break opportunity, '%' in table 7.3 of UTR #14 */
89#define P 3  /* prohibited break,           '^' in table 7.3 of UTR #14 */
90
91extern const unsigned char unilbrk_table[24][24];
92
93/* We don't support line breaking of complex-context dependent characters
94   (Thai, Lao, Myanmar, Khmer) yet, because it requires dictionary lookup. */
95