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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+/*
+ * 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-private.hh"
+
+%%{
+ machine indic_syllable_machine;
+ alphtype unsigned char;
+ write data;
+}%%
+
+%%{
+
+# Same order as enum indic_category_t. Not sure how to avoid duplication.
+X = 0;
+C = 1;
+V = 2;
+N = 3;
+H = 4;
+ZWNJ = 5;
+ZWJ = 6;
+M = 7;
+SM = 8;
+VD = 9;
+A = 10;
+PLACEHOLDER = 11;
+DOTTEDCIRCLE = 12;
+RS = 13;
+Coeng = 14;
+Repha = 15;
+Ra = 16;
+CM = 17;
+Symbol= 18;
+
+c = (C | Ra); # is_consonant
+n = ((ZWNJ?.RS)? (N.N?)?); # is_consonant_modifier
+z = ZWJ|ZWNJ; # is_joiner
+h = H | Coeng; # is_halant_or_coeng
+reph = (Ra H | Repha); # possible reph
+
+cn = c.ZWJ?.n?;
+forced_rakar = ZWJ H ZWJ Ra;
+symbol = Symbol.N?;
+matra_group = z{0,3}.M.N?.(H | forced_rakar)?;
+syllable_tail = (z?.SM.SM?.ZWNJ?)? A{0,3}? VD{0,2};
+place_holder = PLACEHOLDER | DOTTEDCIRCLE;
+halant_group = (z?.h.(ZWJ.N?)?);
+final_halant_group = halant_group | h.ZWNJ;
+medial_group = CM?;
+halant_or_matra_group = (final_halant_group | (h.ZWJ)? matra_group{0,4}) (Coeng (cn|V))?;
+
+
+consonant_syllable = Repha? (cn.halant_group){0,4} cn medial_group halant_or_matra_group syllable_tail;
+vowel_syllable = reph? V.n? (ZWJ | (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail);
+standalone_cluster = (Repha? PLACEHOLDER | reph? DOTTEDCIRCLE).n? (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail;
+symbol_cluster = symbol syllable_tail;
+broken_cluster = reph? n? (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail;
+other = any;
+
+main := |*
+ consonant_syllable => { found_syllable (consonant_syllable); };
+ vowel_syllable => { found_syllable (vowel_syllable); };
+ standalone_cluster => { found_syllable (standalone_cluster); };
+ symbol_cluster => { found_syllable (symbol_cluster); };
+ broken_cluster => { found_syllable (broken_cluster); };
+ other => { found_syllable (non_indic_cluster); };
+*|;
+
+
+}%%
+
+#define found_syllable(syllable_type) \
+ HB_STMT_START { \
+ if (0) fprintf (stderr, "syllable %d..%d %s\n", last, p+1, #syllable_type); \
+ for (unsigned int i = last; i < p+1; i++) \
+ info[i].syllable() = (syllable_serial << 4) | syllable_type; \
+ last = p+1; \
+ syllable_serial++; \
+ if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
+ } HB_STMT_END
+
+static void
+find_syllables (hb_buffer_t *buffer)
+{
+ unsigned int p, pe, eof, ts HB_UNUSED, te HB_UNUSED, act HB_UNUSED;
+ int cs;
+ hb_glyph_info_t *info = buffer->info;
+ %%{
+ write init;
+ getkey info[p].indic_category();
+ }%%
+
+ p = 0;
+ pe = eof = buffer->len;
+
+ unsigned int last = 0;
+ unsigned int syllable_serial = 1;
+ %%{
+ write exec;
+ }%%
+}
+
+#endif /* HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH */