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 34machine deserialize_text_glyphs; 35alphtype unsigned char; 36write data; 37 38action clear_item { 39 hb_memset (&info, 0, sizeof (info)); 40 hb_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 parse_glyph { 56 /* TODO Unescape delimiters. */ 57 if (!hb_font_glyph_from_string (font, 58 tok, p - tok, 59 &info.codepoint)) 60 return false; 61} 62 63action parse_cluster { if (!parse_uint (tok, p, &info.cluster )) return false; } 64action parse_x_offset { if (!parse_int (tok, p, &pos.x_offset )) return false; } 65action parse_y_offset { if (!parse_int (tok, p, &pos.y_offset )) return false; } 66action parse_x_advance { if (!parse_int (tok, p, &pos.x_advance)) return false; } 67action parse_y_advance { if (!parse_int (tok, p, &pos.y_advance)) return false; } 68action parse_glyph_flags{ if (!parse_uint (tok, p, &info.mask )) return false; } 69 70unum = '0' | [1-9] digit*; 71num = '-'? unum; 72 73glyph_id = unum; 74glyph_name = ([^\\\]=@+,#|] | '\\' [\\\]=@+,|]) *; 75 76glyph = (glyph_id | glyph_name) >tok %parse_glyph; 77cluster = '=' (unum >tok %parse_cluster); 78offsets = '@' (num >tok %parse_x_offset) ',' (num >tok %parse_y_offset ); 79advances= '+' (num >tok %parse_x_advance) (',' (num >tok %parse_y_advance))?; 80glyphflags= '#' (unum >tok %parse_glyph_flags); 81 82glyph_item = 83 ( 84 glyph 85 cluster? 86 offsets? 87 advances? 88 glyphflags? 89 ) 90 >clear_item 91 %add_item 92 ; 93 94glyphs = glyph_item (space* '|' space* glyph_item)* space*; 95 96main := space* glyphs; 97 98}%% 99 100static hb_bool_t 101_hb_buffer_deserialize_text_glyphs (hb_buffer_t *buffer, 102 const char *buf, 103 unsigned int buf_len, 104 const char **end_ptr, 105 hb_font_t *font) 106{ 107 const char *p = buf, *pe = buf + buf_len, *eof = pe, *orig_pe = pe; 108 109 /* Ensure we have positions. */ 110 (void) hb_buffer_get_glyph_positions (buffer, nullptr); 111 112 while (p < pe && ISSPACE (*p)) 113 p++; 114 if (p < pe && *p == (buffer->len ? '|' : '[')) 115 *end_ptr = ++p; 116 117 const char *end = strchr ((char *) p, ']'); 118 if (end) 119 pe = eof = end; 120 else 121 { 122 end = strrchr ((char *) p, '|'); 123 if (end) 124 pe = eof = end; 125 else 126 pe = eof = p; 127 } 128 129 const char *tok = nullptr; 130 int cs; 131 hb_glyph_info_t info = {0}; 132 hb_glyph_position_t pos = {0}; 133 %%{ 134 write init; 135 write exec; 136 }%% 137 138 if (pe < orig_pe && *pe == ']') 139 { 140 pe++; 141 if (p == pe) 142 p++; 143 } 144 145 *end_ptr = p; 146 147 return p == pe; 148} 149 150#endif /* HB_BUFFER_DESERIALIZE_TEXT_GLYPHS_HH */ 151