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_HH 28#define HB_BUFFER_DESERIALIZE_TEXT_HH 29 30#include "hb.hh" 31 32%%{ 33 34machine deserialize_text; 35alphtype unsigned char; 36write data; 37 38action clear_item { 39 memset (&info, 0, sizeof (info)); 40 memset (&pos , 0, sizeof (pos )); 41} 42 43action add_item { 44 buffer->add_info (info); 45 if (unlikely (!buffer->successful)) 46 return false; 47 buffer->pos[buffer->len - 1] = pos; 48 *end_ptr = p; 49} 50 51action tok { 52 tok = p; 53} 54 55action ensure_glyphs { if (unlikely (!buffer->ensure_glyphs ())) return false; } 56action ensure_unicode { if (unlikely (!buffer->ensure_unicode ())) return false; } 57 58action parse_glyph { 59 /* TODO Unescape delimeters. */ 60 if (!hb_font_glyph_from_string (font, 61 tok, p - tok, 62 &info.codepoint)) 63 return false; 64} 65 66action parse_hexdigits {if (!parse_hex (tok, p, &info.codepoint )) return false; } 67 68action parse_cluster { if (!parse_uint (tok, p, &info.cluster )) return false; } 69action parse_x_offset { if (!parse_int (tok, p, &pos.x_offset )) return false; } 70action parse_y_offset { if (!parse_int (tok, p, &pos.y_offset )) return false; } 71action parse_x_advance { if (!parse_int (tok, p, &pos.x_advance)) return false; } 72action parse_y_advance { if (!parse_int (tok, p, &pos.y_advance)) return false; } 73 74unum = '0' | [1-9] digit*; 75num = '-'? unum; 76 77glyph_id = unum; 78glyph_name = ([^\\\]=@+,|] | '\\' [\\\]=@+,|]) *; 79 80glyph = (glyph_id | glyph_name) >tok %parse_glyph; 81cluster = '=' (unum >tok %parse_cluster); 82offsets = '@' (num >tok %parse_x_offset) ',' (num >tok %parse_y_offset ); 83advances= '+' (num >tok %parse_x_advance) (',' (num >tok %parse_y_advance))?; 84 85glyph_item = 86 ( 87 glyph 88 cluster? 89 offsets? 90 advances? 91 ) 92 >clear_item 93 @ensure_glyphs 94 %add_item 95 ; 96 97unicode = 'U' '+' xdigit+ >tok %parse_hexdigits; 98 99unicode_item = 100 ( 101 unicode 102 cluster? 103 ) 104 >clear_item 105 @ensure_unicode 106 %add_item 107 ; 108 109glyphs = glyph_item (space* '|' space* glyph_item)* space* ('|'|']')?; 110unicodes = unicode_item (space* '|' space* unicode_item)* space* ('|'|'>')?; 111 112main := space* ( ('[' glyphs) | ('<' unicodes) ); 113 114}%% 115 116static hb_bool_t 117_hb_buffer_deserialize_text (hb_buffer_t *buffer, 118 const char *buf, 119 unsigned int buf_len, 120 const char **end_ptr, 121 hb_font_t *font) 122{ 123 const char *p = buf, *pe = buf + buf_len; 124 125 /* Ensure we have positions. */ 126 (void) hb_buffer_get_glyph_positions (buffer, nullptr); 127 128 while (p < pe && ISSPACE (*p)) 129 p++; 130 131 const char *eof = pe, *tok = nullptr; 132 int cs; 133 hb_glyph_info_t info = {0}; 134 hb_glyph_position_t pos = {0}; 135 %%{ 136 write init; 137 write exec; 138 }%% 139 140 *end_ptr = p; 141 142 return p == pe && *(p-1) != ']'; 143} 144 145#endif /* HB_BUFFER_DESERIALIZE_TEXT_HH */ 146