xref: /aosp_15_r20/external/harfbuzz_ng/src/hb-buffer-deserialize-json.rl (revision 2d1272b857b1f7575e6e246373e1cb218663db8a)
1*2d1272b8SAndroid Build Coastguard Worker/*
2*2d1272b8SAndroid Build Coastguard Worker * Copyright © 2013  Google, Inc.
3*2d1272b8SAndroid Build Coastguard Worker *
4*2d1272b8SAndroid Build Coastguard Worker *  This is part of HarfBuzz, a text shaping library.
5*2d1272b8SAndroid Build Coastguard Worker *
6*2d1272b8SAndroid Build Coastguard Worker * Permission is hereby granted, without written agreement and without
7*2d1272b8SAndroid Build Coastguard Worker * license or royalty fees, to use, copy, modify, and distribute this
8*2d1272b8SAndroid Build Coastguard Worker * software and its documentation for any purpose, provided that the
9*2d1272b8SAndroid Build Coastguard Worker * above copyright notice and the following two paragraphs appear in
10*2d1272b8SAndroid Build Coastguard Worker * all copies of this software.
11*2d1272b8SAndroid Build Coastguard Worker *
12*2d1272b8SAndroid Build Coastguard Worker * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13*2d1272b8SAndroid Build Coastguard Worker * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14*2d1272b8SAndroid Build Coastguard Worker * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15*2d1272b8SAndroid Build Coastguard Worker * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16*2d1272b8SAndroid Build Coastguard Worker * DAMAGE.
17*2d1272b8SAndroid Build Coastguard Worker *
18*2d1272b8SAndroid Build Coastguard Worker * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19*2d1272b8SAndroid Build Coastguard Worker * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20*2d1272b8SAndroid Build Coastguard Worker * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
21*2d1272b8SAndroid Build Coastguard Worker * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22*2d1272b8SAndroid Build Coastguard Worker * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23*2d1272b8SAndroid Build Coastguard Worker *
24*2d1272b8SAndroid Build Coastguard Worker * Google Author(s): Behdad Esfahbod
25*2d1272b8SAndroid Build Coastguard Worker */
26*2d1272b8SAndroid Build Coastguard Worker
27*2d1272b8SAndroid Build Coastguard Worker#ifndef HB_BUFFER_DESERIALIZE_JSON_HH
28*2d1272b8SAndroid Build Coastguard Worker#define HB_BUFFER_DESERIALIZE_JSON_HH
29*2d1272b8SAndroid Build Coastguard Worker
30*2d1272b8SAndroid Build Coastguard Worker#include "hb.hh"
31*2d1272b8SAndroid Build Coastguard Worker
32*2d1272b8SAndroid Build Coastguard Worker%%{
33*2d1272b8SAndroid Build Coastguard Worker
34*2d1272b8SAndroid Build Coastguard Workermachine deserialize_json;
35*2d1272b8SAndroid Build Coastguard Workeralphtype unsigned char;
36*2d1272b8SAndroid Build Coastguard Workerwrite data;
37*2d1272b8SAndroid Build Coastguard Worker
38*2d1272b8SAndroid Build Coastguard Workeraction clear_item {
39*2d1272b8SAndroid Build Coastguard Worker	hb_memset (&info, 0, sizeof (info));
40*2d1272b8SAndroid Build Coastguard Worker	hb_memset (&pos , 0, sizeof (pos ));
41*2d1272b8SAndroid Build Coastguard Worker}
42*2d1272b8SAndroid Build Coastguard Worker
43*2d1272b8SAndroid Build Coastguard Workeraction add_item {
44*2d1272b8SAndroid Build Coastguard Worker	buffer->add_info (info);
45*2d1272b8SAndroid Build Coastguard Worker	if (unlikely (!buffer->successful))
46*2d1272b8SAndroid Build Coastguard Worker	  return false;
47*2d1272b8SAndroid Build Coastguard Worker	buffer->pos[buffer->len - 1] = pos;
48*2d1272b8SAndroid Build Coastguard Worker	*end_ptr = p;
49*2d1272b8SAndroid Build Coastguard Worker}
50*2d1272b8SAndroid Build Coastguard Worker
51*2d1272b8SAndroid Build Coastguard Workeraction tok {
52*2d1272b8SAndroid Build Coastguard Worker	tok = p;
53*2d1272b8SAndroid Build Coastguard Worker}
54*2d1272b8SAndroid Build Coastguard Worker
55*2d1272b8SAndroid Build Coastguard Workeraction ensure_glyphs { if (unlikely (!buffer->ensure_glyphs ())) return false; }
56*2d1272b8SAndroid Build Coastguard Workeraction ensure_unicode { if (unlikely (!buffer->ensure_unicode ())) return false; }
57*2d1272b8SAndroid Build Coastguard Worker
58*2d1272b8SAndroid Build Coastguard Workeraction parse_glyph_name {
59*2d1272b8SAndroid Build Coastguard Worker	/* TODO Unescape \" and \\ if found. */
60*2d1272b8SAndroid Build Coastguard Worker	if (!hb_font_glyph_from_string (font,
61*2d1272b8SAndroid Build Coastguard Worker					tok+1, p - tok - 2, /* Skip "" */
62*2d1272b8SAndroid Build Coastguard Worker					&info.codepoint))
63*2d1272b8SAndroid Build Coastguard Worker	  return false;
64*2d1272b8SAndroid Build Coastguard Worker}
65*2d1272b8SAndroid Build Coastguard Worker
66*2d1272b8SAndroid Build Coastguard Workeraction parse_codepoint	{ if (!parse_uint (tok, p, &info.codepoint)) return false; }
67*2d1272b8SAndroid Build Coastguard Workeraction parse_cluster	{ if (!parse_uint (tok, p, &info.cluster )) return false; }
68*2d1272b8SAndroid Build Coastguard Workeraction parse_x_offset	{ if (!parse_int  (tok, p, &pos.x_offset )) return false; }
69*2d1272b8SAndroid Build Coastguard Workeraction parse_y_offset	{ if (!parse_int  (tok, p, &pos.y_offset )) return false; }
70*2d1272b8SAndroid Build Coastguard Workeraction parse_x_advance	{ if (!parse_int  (tok, p, &pos.x_advance)) return false; }
71*2d1272b8SAndroid Build Coastguard Workeraction parse_y_advance	{ if (!parse_int  (tok, p, &pos.y_advance)) return false; }
72*2d1272b8SAndroid Build Coastguard Workeraction parse_glyph_flags{ if (!parse_uint (tok, p, &info.mask    )) return false; }
73*2d1272b8SAndroid Build Coastguard Worker
74*2d1272b8SAndroid Build Coastguard Workerunum	= '0' | [1-9] digit*;
75*2d1272b8SAndroid Build Coastguard Workernum	= '-'? unum;
76*2d1272b8SAndroid Build Coastguard Worker
77*2d1272b8SAndroid Build Coastguard Workercomma = space* ',' space*;
78*2d1272b8SAndroid Build Coastguard Workercolon = space* ':' space*;
79*2d1272b8SAndroid Build Coastguard Worker
80*2d1272b8SAndroid Build Coastguard Workercodepoint = unum;
81*2d1272b8SAndroid Build Coastguard Workerglyph_name = '"' ([^\\"] | '\\' [\\"])* '"';
82*2d1272b8SAndroid Build Coastguard Worker
83*2d1272b8SAndroid Build Coastguard Workerparse_glyph_name   = (glyph_name >tok %parse_glyph_name);
84*2d1272b8SAndroid Build Coastguard Workerparse_codepoint = (codepoint >tok %parse_codepoint);
85*2d1272b8SAndroid Build Coastguard Worker
86*2d1272b8SAndroid Build Coastguard Workerglyph	=  "\"g\""  colon (parse_glyph_name | parse_codepoint);
87*2d1272b8SAndroid Build Coastguard Workerunicode	=  "\"u\""  colon parse_codepoint;
88*2d1272b8SAndroid Build Coastguard Workercluster	=  "\"cl\"" colon (unum >tok %parse_cluster);
89*2d1272b8SAndroid Build Coastguard Workerxoffset	=  "\"dx\"" colon (num  >tok %parse_x_offset);
90*2d1272b8SAndroid Build Coastguard Workeryoffset	=  "\"dy\"" colon (num  >tok %parse_y_offset);
91*2d1272b8SAndroid Build Coastguard Workerxadvance=  "\"ax\"" colon (num  >tok %parse_x_advance);
92*2d1272b8SAndroid Build Coastguard Workeryadvance=  "\"ay\"" colon (num  >tok %parse_y_advance);
93*2d1272b8SAndroid Build Coastguard Workerglyphflags="\"fl\"" colon (unum >tok %parse_glyph_flags);
94*2d1272b8SAndroid Build Coastguard Worker
95*2d1272b8SAndroid Build Coastguard Workerelement = glyph @ensure_glyphs
96*2d1272b8SAndroid Build Coastguard Worker	| unicode @ensure_unicode
97*2d1272b8SAndroid Build Coastguard Worker	| cluster
98*2d1272b8SAndroid Build Coastguard Worker	| xoffset
99*2d1272b8SAndroid Build Coastguard Worker	| yoffset
100*2d1272b8SAndroid Build Coastguard Worker	| xadvance
101*2d1272b8SAndroid Build Coastguard Worker	| yadvance
102*2d1272b8SAndroid Build Coastguard Worker	| glyphflags;
103*2d1272b8SAndroid Build Coastguard Workeritem	=
104*2d1272b8SAndroid Build Coastguard Worker	( '{' space* element (comma element)* space* '}')
105*2d1272b8SAndroid Build Coastguard Worker	>clear_item
106*2d1272b8SAndroid Build Coastguard Worker	@add_item
107*2d1272b8SAndroid Build Coastguard Worker	;
108*2d1272b8SAndroid Build Coastguard Worker
109*2d1272b8SAndroid Build Coastguard Workermain := space* item (comma item)* space* (','|']');
110*2d1272b8SAndroid Build Coastguard Worker
111*2d1272b8SAndroid Build Coastguard Worker}%%
112*2d1272b8SAndroid Build Coastguard Worker
113*2d1272b8SAndroid Build Coastguard Workerstatic hb_bool_t
114*2d1272b8SAndroid Build Coastguard Worker_hb_buffer_deserialize_json (hb_buffer_t *buffer,
115*2d1272b8SAndroid Build Coastguard Worker				    const char *buf,
116*2d1272b8SAndroid Build Coastguard Worker				    unsigned int buf_len,
117*2d1272b8SAndroid Build Coastguard Worker				    const char **end_ptr,
118*2d1272b8SAndroid Build Coastguard Worker				    hb_font_t *font)
119*2d1272b8SAndroid Build Coastguard Worker{
120*2d1272b8SAndroid Build Coastguard Worker  const char *p = buf, *pe = buf + buf_len;
121*2d1272b8SAndroid Build Coastguard Worker
122*2d1272b8SAndroid Build Coastguard Worker  /* Ensure we have positions. */
123*2d1272b8SAndroid Build Coastguard Worker  (void) hb_buffer_get_glyph_positions (buffer, nullptr);
124*2d1272b8SAndroid Build Coastguard Worker
125*2d1272b8SAndroid Build Coastguard Worker  while (p < pe && ISSPACE (*p))
126*2d1272b8SAndroid Build Coastguard Worker    p++;
127*2d1272b8SAndroid Build Coastguard Worker  if (p < pe && *p == (buffer->len ? ',' : '['))
128*2d1272b8SAndroid Build Coastguard Worker    *end_ptr = ++p;
129*2d1272b8SAndroid Build Coastguard Worker
130*2d1272b8SAndroid Build Coastguard Worker  const char *tok = nullptr;
131*2d1272b8SAndroid Build Coastguard Worker  int cs;
132*2d1272b8SAndroid Build Coastguard Worker  hb_glyph_info_t info = {0};
133*2d1272b8SAndroid Build Coastguard Worker  hb_glyph_position_t pos = {0};
134*2d1272b8SAndroid Build Coastguard Worker  %%{
135*2d1272b8SAndroid Build Coastguard Worker    write init;
136*2d1272b8SAndroid Build Coastguard Worker    write exec;
137*2d1272b8SAndroid Build Coastguard Worker  }%%
138*2d1272b8SAndroid Build Coastguard Worker
139*2d1272b8SAndroid Build Coastguard Worker  *end_ptr = p;
140*2d1272b8SAndroid Build Coastguard Worker
141*2d1272b8SAndroid Build Coastguard Worker  return p == pe && *(p-1) != ']';
142*2d1272b8SAndroid Build Coastguard Worker}
143*2d1272b8SAndroid Build Coastguard Worker
144*2d1272b8SAndroid Build Coastguard Worker#endif /* HB_BUFFER_DESERIALIZE_JSON_HH */
145