hb-buffer-deserialize-text-glyphs.rl (3442B)
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_GLYPHS_HH 28 #define HB_BUFFER_DESERIALIZE_TEXT_GLYPHS_HH 29 30 #include "hb.hh" 31 32 %%{ 33 34 machine deserialize_text_glyphs; 35 alphtype unsigned char; 36 write data; 37 38 action clear_item { 39 hb_memset (&info, 0, sizeof (info)); 40 hb_memset (&pos , 0, sizeof (pos )); 41 } 42 43 action add_item { 44 buffer->add_info_and_pos (info, pos); 45 if (unlikely (!buffer->successful)) 46 return false; 47 *end_ptr = p; 48 } 49 50 action tok { 51 tok = p; 52 } 53 54 action parse_glyph { 55 /* TODO Unescape delimiters. */ 56 if (!hb_font_glyph_from_string (font, 57 tok, p - tok, 58 &info.codepoint)) 59 return false; 60 } 61 62 action parse_cluster { if (!parse_uint (tok, p, &info.cluster )) return false; } 63 action parse_x_offset { if (!parse_int (tok, p, &pos.x_offset )) return false; } 64 action parse_y_offset { if (!parse_int (tok, p, &pos.y_offset )) return false; } 65 action parse_x_advance { if (!parse_int (tok, p, &pos.x_advance)) return false; } 66 action parse_y_advance { if (!parse_int (tok, p, &pos.y_advance)) return false; } 67 action parse_glyph_flags{ if (!parse_uint (tok, p, &info.mask )) return false; } 68 69 unum = '0' | [1-9] digit*; 70 num = '-'? unum; 71 72 glyph_id = unum; 73 glyph_name = ([^\\\]=@+,#|] | '\\' [\\\]=@+,|]) *; 74 75 glyph = (glyph_id | glyph_name) >tok %parse_glyph; 76 cluster = '=' (unum >tok %parse_cluster); 77 offsets = '@' (num >tok %parse_x_offset) ',' (num >tok %parse_y_offset ); 78 advances= '+' (num >tok %parse_x_advance) (',' (num >tok %parse_y_advance))?; 79 glyphflags = '#' (unum >tok %parse_glyph_flags); 80 # Not parsed. Ignored. 81 glyphextents = '<' (num ',' num ',' num ',' num) '>'; 82 83 glyph_item = 84 ( 85 glyph 86 cluster? 87 offsets? 88 advances? 89 glyphflags? 90 glyphextents? 91 ( '|' | ']') 92 ) 93 >clear_item 94 %add_item 95 ; 96 97 glyphs = '['? glyph_item* ; 98 99 main := glyphs; 100 101 }%% 102 103 static hb_bool_t 104 _hb_buffer_deserialize_text_glyphs (hb_buffer_t *buffer, 105 const char *buf, 106 unsigned int buf_len, 107 const char **end_ptr, 108 hb_font_t *font) 109 { 110 const char *p = buf, *pe = buf + buf_len, *eof = pe; 111 112 /* Ensure we have positions. */ 113 (void) hb_buffer_get_glyph_positions (buffer, nullptr); 114 115 const char *tok = nullptr; 116 int cs; 117 hb_glyph_info_t info = {0}; 118 hb_glyph_position_t pos = {0}; 119 %%{ 120 write init; 121 write exec; 122 }%% 123 124 *end_ptr = p; 125 126 return p == pe; 127 } 128 129 #endif /* HB_BUFFER_DESERIALIZE_TEXT_GLYPHS_HH */