151 lines
3.7 KiB
Ragel
151 lines
3.7 KiB
Ragel
/*
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* Copyright © 2013 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_BUFFER_DESERIALIZE_TEXT_GLYPHS_HH
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#define HB_BUFFER_DESERIALIZE_TEXT_GLYPHS_HH
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#include "hb.hh"
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%%{
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machine deserialize_text_glyphs;
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alphtype unsigned char;
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write data;
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action clear_item {
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hb_memset (&info, 0, sizeof (info));
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hb_memset (&pos , 0, sizeof (pos ));
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}
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action add_item {
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buffer->add_info (info);
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if (unlikely (!buffer->successful))
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return false;
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buffer->pos[buffer->len - 1] = pos;
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*end_ptr = p;
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}
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action tok {
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tok = p;
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}
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action parse_glyph {
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/* TODO Unescape delimiters. */
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if (!hb_font_glyph_from_string (font,
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tok, p - tok,
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&info.codepoint))
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return false;
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}
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action parse_cluster { if (!parse_uint (tok, p, &info.cluster )) return false; }
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action parse_x_offset { if (!parse_int (tok, p, &pos.x_offset )) return false; }
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action parse_y_offset { if (!parse_int (tok, p, &pos.y_offset )) return false; }
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action parse_x_advance { if (!parse_int (tok, p, &pos.x_advance)) return false; }
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action parse_y_advance { if (!parse_int (tok, p, &pos.y_advance)) return false; }
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action parse_glyph_flags{ if (!parse_uint (tok, p, &info.mask )) return false; }
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unum = '0' | [1-9] digit*;
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num = '-'? unum;
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glyph_id = unum;
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glyph_name = ([^\\\]=@+,#|] | '\\' [\\\]=@+,|]) *;
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glyph = (glyph_id | glyph_name) >tok %parse_glyph;
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cluster = '=' (unum >tok %parse_cluster);
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offsets = '@' (num >tok %parse_x_offset) ',' (num >tok %parse_y_offset );
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advances= '+' (num >tok %parse_x_advance) (',' (num >tok %parse_y_advance))?;
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glyphflags= '#' (unum >tok %parse_glyph_flags);
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glyph_item =
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(
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glyph
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cluster?
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offsets?
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advances?
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glyphflags?
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)
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>clear_item
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%add_item
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;
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glyphs = glyph_item (space* '|' space* glyph_item)* space*;
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main := space* glyphs;
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}%%
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static hb_bool_t
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_hb_buffer_deserialize_text_glyphs (hb_buffer_t *buffer,
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const char *buf,
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unsigned int buf_len,
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const char **end_ptr,
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hb_font_t *font)
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{
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const char *p = buf, *pe = buf + buf_len, *eof = pe, *orig_pe = pe;
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/* Ensure we have positions. */
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(void) hb_buffer_get_glyph_positions (buffer, nullptr);
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while (p < pe && ISSPACE (*p))
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p++;
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if (p < pe && *p == (buffer->len ? '|' : '['))
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*end_ptr = ++p;
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const char *end = strchr ((char *) p, ']');
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if (end)
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pe = eof = end;
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else
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{
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end = strrchr ((char *) p, '|');
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if (end)
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pe = eof = end;
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else
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pe = eof = p;
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}
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const char *tok = nullptr;
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int cs;
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hb_glyph_info_t info = {0};
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hb_glyph_position_t pos = {0};
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%%{
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write init;
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write exec;
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}%%
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if (pe < orig_pe && *pe == ']')
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{
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pe++;
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if (p == pe)
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p++;
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}
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*end_ptr = p;
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return p == pe;
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}
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#endif /* HB_BUFFER_DESERIALIZE_TEXT_GLYPHS_HH */
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