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-private.hh" 31 32 %%{ 33 34 machine deserialize_json; 35 alphtype unsigned char; 36 write data; 37 38 action clear_item { 39 memset (&info, 0, sizeof (info)); 40 memset (&pos , 0, sizeof (pos )); 41 } 42 43 action add_item { 44 buffer->add_info (info); 45 if (buffer->in_error) 46 return false; 47 buffer->pos[buffer->len - 1] = pos; 48 *end_ptr = p; 49 } 50 51 action tok { 52 tok = p; 53 } 54 55 action parse_glyph { 56 if (!hb_font_glyph_from_string (font, 57 tok, p - tok, 58 &info.codepoint)) 59 return false; 60 } 61 62 action parse_gid { if (!parse_uint (tok, p, &info.codepoint)) return false; } 63 action parse_cluster { if (!parse_uint (tok, p, &info.cluster )) return false; } 64 action parse_x_offset { if (!parse_int (tok, p, &pos.x_offset )) return false; } 65 action parse_y_offset { if (!parse_int (tok, p, &pos.y_offset )) return false; } 66 action parse_x_advance { if (!parse_int (tok, p, &pos.x_advance)) return false; } 67 action parse_y_advance { if (!parse_int (tok, p, &pos.y_advance)) return false; } 68 69 unum = '0' | [1-9] digit*; 70 num = '-'? unum; 71 72 comma = space* ',' space*; 73 colon = space* ':' space*; 74 75 glyph_id = unum; 76 glyph_name = alpha (alnum|'_'|'.'|'-')*; 77 78 glyph_string = '"' (glyph_name >tok %parse_glyph) '"'; 79 glyph_number = (glyph_id >tok %parse_gid); 80 81 glyph = "\"g\"" colon (glyph_string | glyph_number); 82 cluster = "\"cl\"" colon (unum >tok %parse_cluster); 83 xoffset = "\"dx\"" colon (num >tok %parse_x_offset); 84 yoffset = "\"dy\"" colon (num >tok %parse_y_offset); 85 xadvance= "\"ax\"" colon (num >tok %parse_x_advance); 86 yadvance= "\"ay\"" colon (num >tok %parse_y_advance); 87 88 element = glyph | cluster | xoffset | yoffset | xadvance | yadvance; 89 item = 90 ( '{' space* element (comma element)* space* '}') 91 >clear_item 92 @add_item 93 ; 94 95 main := space* item (comma item)* space* (','|']')?; 96 97 }%% 98 99 static hb_bool_t 100 _hb_buffer_deserialize_glyphs_json (hb_buffer_t *buffer, 101 const char *buf, 102 unsigned int buf_len, 103 const char **end_ptr, 104 hb_font_t *font) 105 { 106 const char *p = buf, *pe = buf + buf_len; 107 108 /* Ensure we have positions. */ 109 (void) hb_buffer_get_glyph_positions (buffer, NULL); 110 111 while (p < pe && ISSPACE (*p)) 112 p++; 113 if (p < pe && *p == (buffer->len ? ',' : '[')) 114 { 115 *end_ptr = ++p; 116 } 117 118 const char *tok = NULL; 119 int cs; 120 hb_glyph_info_t info = {0}; 121 hb_glyph_position_t pos = {0}; 122 %%{ 123 write init; 124 write exec; 125 }%% 126 127 *end_ptr = p; 128 129 return p == pe && *(p-1) != ']'; 130 } 131 132 #endif /* HB_BUFFER_DESERIALIZE_JSON_HH */ 133
