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_JSON_HH 28#define HB_BUFFER_DESERIALIZE_JSON_HH 29 30#include "hb.hh" 31 32%%{ 33 34machine deserialize_json; 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 ensure_glyphs { if (unlikely (!buffer->ensure_glyphs ())) return false; } 56action ensure_unicode { if (unlikely (!buffer->ensure_unicode ())) return false; } 57 58action parse_glyph_name { 59 /* TODO Unescape \" and \\ if found. */ 60 if (!hb_font_glyph_from_string (font, 61 tok+1, p - tok - 2, /* Skip "" */ 62 &info.codepoint)) 63 return false; 64} 65 66action parse_codepoint { if (!parse_uint (tok, p, &info.codepoint)) return false; } 67action parse_cluster { if (!parse_uint (tok, p, &info.cluster )) return false; } 68action parse_x_offset { if (!parse_int (tok, p, &pos.x_offset )) return false; } 69action parse_y_offset { if (!parse_int (tok, p, &pos.y_offset )) return false; } 70action parse_x_advance { if (!parse_int (tok, p, &pos.x_advance)) return false; } 71action parse_y_advance { if (!parse_int (tok, p, &pos.y_advance)) return false; } 72action parse_glyph_flags{ if (!parse_uint (tok, p, &info.mask )) return false; } 73 74unum = '0' | [1-9] digit*; 75num = '-'? unum; 76 77comma = space* ',' space*; 78colon = space* ':' space*; 79 80codepoint = unum; 81glyph_name = '"' ([^\\"] | '\\' [\\"])* '"'; 82 83parse_glyph_name = (glyph_name >tok %parse_glyph_name); 84parse_codepoint = (codepoint >tok %parse_codepoint); 85 86glyph = "\"g\"" colon (parse_glyph_name | parse_codepoint); 87unicode = "\"u\"" colon parse_codepoint; 88cluster = "\"cl\"" colon (unum >tok %parse_cluster); 89xoffset = "\"dx\"" colon (num >tok %parse_x_offset); 90yoffset = "\"dy\"" colon (num >tok %parse_y_offset); 91xadvance= "\"ax\"" colon (num >tok %parse_x_advance); 92yadvance= "\"ay\"" colon (num >tok %parse_y_advance); 93glyphflags="\"fl\"" colon (unum >tok %parse_glyph_flags); 94 95element = glyph @ensure_glyphs 96 | unicode @ensure_unicode 97 | cluster 98 | xoffset 99 | yoffset 100 | xadvance 101 | yadvance 102 | glyphflags; 103item = 104 ( '{' space* element (comma element)* space* '}') 105 >clear_item 106 @add_item 107 ; 108 109main := space* item (comma item)* space* (','|']'); 110 111}%% 112 113static hb_bool_t 114_hb_buffer_deserialize_json (hb_buffer_t *buffer, 115 const char *buf, 116 unsigned int buf_len, 117 const char **end_ptr, 118 hb_font_t *font) 119{ 120 const char *p = buf, *pe = buf + buf_len; 121 122 /* Ensure we have positions. */ 123 (void) hb_buffer_get_glyph_positions (buffer, nullptr); 124 125 while (p < pe && ISSPACE (*p)) 126 p++; 127 if (p < pe && *p == (buffer->len ? ',' : '[')) 128 *end_ptr = ++p; 129 130 const char *tok = nullptr; 131 int cs; 132 hb_glyph_info_t info = {0}; 133 hb_glyph_position_t pos = {0}; 134 %%{ 135 write init; 136 write exec; 137 }%% 138 139 *end_ptr = p; 140 141 return p == pe && *(p-1) != ']'; 142} 143 144#endif /* HB_BUFFER_DESERIALIZE_JSON_HH */ 145