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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_SHAPER_KHMER_MACHINE_HH
+#define HB_OT_SHAPER_KHMER_MACHINE_HH
+
+#include "hb.hh"
+
+#include "hb-ot-layout.hh"
+#include "hb-ot-shaper-indic.hh"
+
+/* buffer var allocations */
+#define khmer_category() ot_shaper_var_u8_category() /* khmer_category_t */
+
+using khmer_category_t = unsigned;
+
+#define K_Cat(Cat) khmer_syllable_machine_ex_##Cat
+
+enum khmer_syllable_type_t {
+ khmer_consonant_syllable,
+ khmer_broken_cluster,
+ khmer_non_khmer_cluster,
+};
+
+%%{
+ machine khmer_syllable_machine;
+ alphtype unsigned char;
+ write exports;
+ write data;
+}%%
+
+%%{
+
+
+# We use category H for spec category Coeng
+
+export C = 1;
+export V = 2;
+export H = 4;
+export ZWNJ = 5;
+export ZWJ = 6;
+export PLACEHOLDER = 10;
+export DOTTEDCIRCLE = 11;
+export Ra = 15;
+
+export VAbv = 20;
+export VBlw = 21;
+export VPre = 22;
+export VPst = 23;
+
+export Robatic = 25;
+export Xgroup = 26;
+export Ygroup = 27;
+
+
+c = (C | Ra | V);
+cn = c.((ZWJ|ZWNJ)?.Robatic)?;
+joiner = (ZWJ | ZWNJ);
+xgroup = (joiner*.Xgroup)*;
+ygroup = Ygroup*;
+
+# This grammar was experimentally extracted from what Uniscribe allows.
+
+matra_group = VPre? xgroup VBlw? xgroup (joiner?.VAbv)? xgroup VPst?;
+syllable_tail = xgroup matra_group xgroup (H.c)? ygroup;
+
+
+broken_cluster = Robatic? (H.cn)* (H | syllable_tail);
+consonant_syllable = (cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster;
+other = any;
+
+main := |*
+ consonant_syllable => { found_syllable (khmer_consonant_syllable); };
+ broken_cluster => { found_syllable (khmer_broken_cluster); buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE; };
+ other => { found_syllable (khmer_non_khmer_cluster); };
+*|;
+
+
+}%%
+
+#define found_syllable(syllable_type) \
+ HB_STMT_START { \
+ if (0) fprintf (stderr, "syllable %u..%u %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 (syllable_serial == 16) syllable_serial = 1; \
+ } HB_STMT_END
+
+inline void
+find_syllables_khmer (hb_buffer_t *buffer)
+{
+ unsigned int p, pe, eof, ts, te, act HB_UNUSED;
+ int cs;
+ hb_glyph_info_t *info = buffer->info;
+ %%{
+ write init;
+ getkey info[p].khmer_category();
+ }%%
+
+ p = 0;
+ pe = eof = buffer->len;
+
+ unsigned int syllable_serial = 1;
+ %%{
+ write exec;
+ }%%
+}
+
+#undef found_syllable
+
+#endif /* HB_OT_SHAPER_KHMER_MACHINE_HH */