| /* |
| * Copyright © 2011,2012 Google, Inc. |
| * |
| * This is part of HarfBuzz, a text shaping library. |
| * |
| * Permission is hereby granted, without written agreement and without |
| * license or royalty fees, to use, copy, modify, and distribute this |
| * software and its documentation for any purpose, provided that the |
| * above copyright notice and the following two paragraphs appear in |
| * all copies of this software. |
| * |
| * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
| * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
| * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
| * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| * |
| * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
| * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
| * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
| * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| * |
| * Google Author(s): Behdad Esfahbod |
| */ |
| |
| #ifndef HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH |
| #define HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH |
| |
| #include "hb.hh" |
| |
| enum indic_syllable_type_t { |
| indic_consonant_syllable, |
| indic_vowel_syllable, |
| indic_standalone_cluster, |
| indic_symbol_cluster, |
| indic_broken_cluster, |
| indic_non_indic_cluster, |
| }; |
| |
| %%{ |
| machine indic_syllable_machine; |
| alphtype unsigned char; |
| write exports; |
| write data; |
| }%% |
| |
| %%{ |
| |
| export C = 1; |
| export V = 2; |
| export N = 3; |
| export H = 4; |
| export ZWNJ = 5; |
| export ZWJ = 6; |
| export M = 7; |
| export SM = 8; |
| export A = 10; |
| export PLACEHOLDER = 11; |
| export DOTTEDCIRCLE = 12; |
| export RS = 13; |
| export Repha = 15; |
| export Ra = 16; |
| export CM = 17; |
| export Symbol= 18; |
| export CS = 19; |
| |
| c = (C | Ra); # is_consonant |
| n = ((ZWNJ?.RS)? (N.N?)?); # is_consonant_modifier |
| z = ZWJ|ZWNJ; # is_joiner |
| reph = (Ra H | Repha); # possible reph |
| |
| cn = c.ZWJ?.n?; |
| forced_rakar = ZWJ H ZWJ Ra; |
| symbol = Symbol.N?; |
| matra_group = z*.M.N?.(H | forced_rakar)?; |
| syllable_tail = (z?.SM.SM?.ZWNJ?)? A*; |
| halant_group = (z?.H.(ZWJ.N?)?); |
| final_halant_group = halant_group | H.ZWNJ; |
| medial_group = CM?; |
| halant_or_matra_group = (final_halant_group | matra_group*); |
| |
| complex_syllable_tail = (halant_group.cn)* medial_group halant_or_matra_group syllable_tail; |
| |
| consonant_syllable = (Repha|CS)? cn complex_syllable_tail; |
| vowel_syllable = reph? V.n? (ZWJ | complex_syllable_tail); |
| standalone_cluster = ((Repha|CS)? PLACEHOLDER | reph? DOTTEDCIRCLE).n? complex_syllable_tail; |
| symbol_cluster = symbol syllable_tail; |
| broken_cluster = reph? n? complex_syllable_tail; |
| other = any; |
| |
| main := |* |
| consonant_syllable => { found_syllable (indic_consonant_syllable); }; |
| vowel_syllable => { found_syllable (indic_vowel_syllable); }; |
| standalone_cluster => { found_syllable (indic_standalone_cluster); }; |
| symbol_cluster => { found_syllable (indic_symbol_cluster); }; |
| broken_cluster => { found_syllable (indic_broken_cluster); }; |
| other => { found_syllable (indic_non_indic_cluster); }; |
| *|; |
| |
| |
| }%% |
| |
| #define found_syllable(syllable_type) \ |
| HB_STMT_START { \ |
| if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \ |
| for (unsigned int i = ts; i < te; i++) \ |
| info[i].syllable() = (syllable_serial << 4) | syllable_type; \ |
| syllable_serial++; \ |
| if (unlikely (syllable_serial == 16)) syllable_serial = 1; \ |
| } HB_STMT_END |
| |
| static void |
| find_syllables_indic (hb_buffer_t *buffer) |
| { |
| unsigned int p, pe, eof, ts, te, act; |
| int cs; |
| hb_glyph_info_t *info = buffer->info; |
| %%{ |
| write init; |
| getkey info[p].indic_category(); |
| }%% |
| |
| p = 0; |
| pe = eof = buffer->len; |
| |
| unsigned int syllable_serial = 1; |
| %%{ |
| write exec; |
| }%% |
| } |
| |
| #undef found_syllable |
| |
| #endif /* HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH */ |