1/* 2 * Copyright © 2013 Google, Inc. 3 * 4 * This is part of HarfBuzz, a text shaping library. 5 * 6 * Permission is hereby granted, without written agreement and without 7 * license or royalty fees, to use, copy, modify, and distribute this 8 * software and its documentation for any purpose, provided that the 9 * above copyright notice and the following two paragraphs appear in 10 * all copies of this software. 11 * 12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 16 * DAMAGE. 17 * 18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 23 * 24 * Google Author(s): Behdad Esfahbod 25 */ 26 27#ifndef HB_BUFFER_DESERIALIZE_TEXT_UNICODE_HH 28#define HB_BUFFER_DESERIALIZE_TEXT_UNICODE_HH 29 30#include "hb.hh" 31 32%%{ 33 34machine deserialize_text_unicode; 35alphtype unsigned char; 36write data; 37 38action clear_item { 39 hb_memset (&info, 0, sizeof (info)); 40} 41 42action add_item { 43 buffer->add_info (info); 44 if (unlikely (!buffer->successful)) 45 return false; 46 if (buffer->have_positions) 47 buffer->pos[buffer->len - 1] = pos; 48 *end_ptr = p; 49} 50 51action tok { 52 tok = p; 53} 54 55action parse_hexdigits {if (!parse_hex (tok, p, &info.codepoint )) return false; } 56 57action parse_cluster { if (!parse_uint (tok, p, &info.cluster )) return false; } 58 59unum = '0' | [1-9] digit*; 60num = '-'? unum; 61 62cluster = '=' (unum >tok %parse_cluster); 63 64unicode = [Uu] '+'? xdigit+ >tok %parse_hexdigits; 65 66unicode_item = 67 ( 68 unicode 69 cluster? 70 ) 71 >clear_item 72 %add_item 73 ; 74 75unicodes = unicode_item (space* '|' space* unicode_item)* space*; 76 77main := space* unicodes; 78 79}%% 80 81static hb_bool_t 82_hb_buffer_deserialize_text_unicode (hb_buffer_t *buffer, 83 const char *buf, 84 unsigned int buf_len, 85 const char **end_ptr, 86 hb_font_t *font) 87{ 88 const char *p = buf, *pe = buf + buf_len, *eof = pe, *orig_pe = pe; 89 90 while (p < pe && ISSPACE (*p)) 91 p++; 92 if (p < pe && *p == (buffer->len ? '|' : '<')) 93 *end_ptr = ++p; 94 95 const char *end = strchr ((char *) p, '>'); 96 if (end) 97 pe = eof = end; 98 else 99 { 100 end = strrchr ((char *) p, '|'); 101 if (end) 102 pe = eof = end; 103 else 104 pe = eof = p; 105 } 106 107 108 const char *tok = nullptr; 109 int cs; 110 hb_glyph_info_t info = {0}; 111 const hb_glyph_position_t pos = {0}; 112 %%{ 113 write init; 114 write exec; 115 }%% 116 117 if (pe < orig_pe && *pe == '>') 118 { 119 pe++; 120 if (p == pe) 121 p++; 122 } 123 124 *end_ptr = p; 125 126 return p == pe; 127} 128 129#endif /* HB_BUFFER_DESERIALIZE_TEXT_UNICODE_HH */ 130