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1	<?php
2
3	class SEA
4	{
5	// South East Asian shaper
6	// sea_category
7	const OT_X = 0;
8
9	const OT_C = 1;
10
11	const OT_IV = 2; # Independent Vowel
12
13	const OT_T = 3; # Tone Marks
14
15	const OT_H = 4; # Halant
16
17	const OT_A = 10; # Anusvara
18
19	const OT_GB = 12; # Generic Base (OT_DOTTEDCIRCLE in Indic)
20
21	const OT_CM = 17; # Consonant Medial
22
23	const OT_MR = 22; # Medial Ra
24
25	const OT_VAbv = 26;
26
27	const OT_VBlw = 27;
28
29	const OT_VPre = 28;
30
31	const OT_VPst = 29;
32
33	// ? From Indic categories
34	const OT_ZWNJ = 5;
35
36	const OT_ZWJ = 6;
37
38	const OT_M = 7;
39
40	const OT_SM = 8;
41
42	const OT_VD = 9;
43
44	const OT_NBSP = 11;
45
46	const OT_RS = 13;
47
48	const OT_Coeng = 14;
49
50	const OT_Repha = 15;
51
52	const OT_Ra = 16;
53
54	// Based on sea_category used to make string to find syllables
55	// OT_ to string character (using e.g. OT_C from INDIC) hb-ot-shape-complex-sea-private.hh
56	public static $sea_category_char = array(
57	'x',
58	'C',
59	'V',
60	'T',
61	'H',
62	'x',
63	'x',
64	'x',
65	'x',
66	'x',
67	'A',
68	'x',
69	'G',
70	'x',
71	'x',
72	'x',
73	'x',
74	'M',
75	'x',
76	'x',
77	'x',
78	'x',
79	'R',
80	'x',
81	'x',
82	'x',
83	'a',
84	'b',
85	'p',
86	't',
87	);
88
89	/* Visual positions in a syllable from left to right. */
90	// sea_position
91	const POS_START = 0;
92
93	const POS_RA_TO_BECOME_REPH = 1;
94
95	const POS_PRE_M = 2;
96
97	const POS_PRE_C = 3;
98
99	const POS_BASE_C = 4;
100
101	const POS_AFTER_MAIN = 5;
102
103	const POS_ABOVE_C = 6;
104
105	const POS_BEFORE_SUB = 7;
106
107	const POS_BELOW_C = 8;
108
109	const POS_AFTER_SUB = 9;
110
111	const POS_BEFORE_POST = 10;
112
113	const POS_POST_C = 11;
114
115	const POS_AFTER_POST = 12;
116
117	const POS_FINAL_C = 13;
118
119	const POS_SMVD = 14;
120
121	const POS_END = 15;
122
123	public static function set_sea_properties(&$info, $scriptblock)
124	{
125	$u = $info['uni'];
126	$type = self::sea_get_categories($u);
127	$cat = ($type & 0x7F);
128	$pos = ($type >> 8);
129
130	/*
131	* Re-assign category
132	*/
133	// Medial Ra
134	if ($u == 0x1A55 \|\| $u == 0xAA34) {
135	$cat = self::OT_MR;
136	}
137
138	/*
139	* Re-assign position.
140	*/
141	if ($cat == self::OT_M) { // definitely "OT_M" in HarfBuzz - although this does not seem to have been defined ? should be OT_MR
142	switch ($pos) {
143	case self::POS_PRE_C: $cat = self::OT_VPre;
144	break;
145	case self::POS_ABOVE_C: $cat = self::OT_VAbv;
146	break;
147	case self::POS_BELOW_C: $cat = self::OT_VBlw;
148	break;
149	case self::POS_POST_C: $cat = self::OT_VPst;
150	break;
151	}
152	}
153
154	$info['sea_category'] = $cat;
155	$info['sea_position'] = $pos;
156	}
157
158	// syllable_type
159	const CONSONANT_SYLLABLE = 0;
160
161	const BROKEN_CLUSTER = 1;
162
163	const NON_SEA_CLUSTER = 2;
164
165	public static function set_syllables(&$o, $s, &$broken_syllables)
166	{
167	$ptr = 0;
168	$syllable_serial = 1;
169	$broken_syllables = false;
170	while ($ptr < strlen($s)) {
171	$match = '';
172	$syllable_length = 1;
173	$syllable_type = self::NON_SEA_CLUSTER;
174
175	// CONSONANT_SYLLABLE Consonant syllable
176	if (preg_match('/^(C\|V\|G)(p\|a\|b\|t\|HC\|M\|R\|T\|A)*/', substr($s, $ptr), $ma)) {
177	$syllable_length = strlen($ma[0]);
178	$syllable_type = self::CONSONANT_SYLLABLE;
179	}
180	// BROKEN_CLUSTER syllable
181	else if (preg_match('/^(p\|a\|b\|t\|HC\|M\|R\|T\|A)+/', substr($s, $ptr), $ma)) {
182	$syllable_length = strlen($ma[0]);
183	$syllable_type = self::BROKEN_CLUSTER;
184	$broken_syllables = true;
185	}
186
187	for ($i = $ptr; $i < $ptr + $syllable_length; $i++) {
188	$o[$i]['syllable'] = ($syllable_serial << 4) \| $syllable_type;
189	}
190	$ptr += $syllable_length;
191	$syllable_serial++;
192	if ($syllable_serial == 16)
193	$syllable_serial = 1;
194	}
195	}
196
197	public static function initial_reordering(&$info, $GSUBdata, $broken_syllables, $scriptblock, $dottedcircle)
198	{
199
200	if ($broken_syllables && $dottedcircle) {
201	self::insert_dotted_circles($info, $dottedcircle);
202	}
203
204	$count = count($info);
205	if (!$count)
206	return;
207	$last = 0;
208	$last_syllable = $info[0]['syllable'];
209	for ($i = 1; $i < $count; $i++) {
210	if ($last_syllable != $info[$i]['syllable']) {
211	self::initial_reordering_syllable($info, $GSUBdata, $scriptblock, $last, $i);
212	$last = $i;
213	$last_syllable = $info[$last]['syllable'];
214	}
215	}
216	self::initial_reordering_syllable($info, $GSUBdata, $scriptblock, $last, $count);
217	}
218
219	public static function insert_dotted_circles(&$info, $dottedcircle)
220	{
221	$idx = 0;
222	$last_syllable = 0;
223	while ($idx < count($info)) {
224	$syllable = $info[$idx]['syllable'];
225	$syllable_type = ($syllable & 0x0F);
226	if ($last_syllable != $syllable && $syllable_type == self::BROKEN_CLUSTER) {
227	$last_syllable = $syllable;
228	$dottedcircle[0]['syllable'] = $info[$idx]['syllable'];
229	array_splice($info, $idx, 0, $dottedcircle);
230	} else
231	$idx++;
232	}
233	}
234
235	public static function initial_reordering_syllable(&$info, $GSUBdata, $scriptblock, $start, $end)
236	{
237	/* broken_cluster: We already inserted dotted-circles, so just call the standalone_cluster. */
238
239	$syllable_type = ($info[$start]['syllable'] & 0x0F);
240	if ($syllable_type == self::NON_SEA_CLUSTER) {
241	return;
242	}
243	if ($syllable_type == self::BROKEN_CLUSTER) {
244	/* For dotted-circle, this is what Uniscribe does:
245	* If dotted-circle is the last glyph, it just does nothing. */
246	if ($info[$end - 1]['sea_category'] == self::OT_GB) {
247	return;
248	}
249	}
250
251	$base = $start;
252	$i = $start;
253	for (; $i < $base; $i++)
254	$info[$i]['sea_position'] = self::POS_PRE_C;
255	if ($i < $end) {
256	$info[$i]['sea_position'] = self::POS_BASE_C;
257	$i++;
258	}
259	for (; $i < $end; $i++) {
260	if (isset($info[$i]['sea_category']) && $info[$i]['sea_category'] == self::OT_MR) { /* Pre-base reordering */
261	$info[$i]['sea_position'] = self::POS_PRE_C;
262	continue;
263	}
264	if (isset($info[$i]['sea_category']) && $info[$i]['sea_category'] == self::OT_VPre) { /* Left matra */
265	$info[$i]['sea_position'] = self::POS_PRE_M;
266	continue;
267	}
268	$info[$i]['sea_position'] = self::POS_AFTER_MAIN;
269	}
270
271	/* Sit tight, rock 'n roll! */
272	self::bubble_sort($info, $start, $end - $start);
273	}
274
275	public static function final_reordering(&$info, $GSUBdata, $scriptblock)
276	{
277	$count = count($info);
278	if (!$count)
279	return;
280	$last = 0;
281	$last_syllable = $info[0]['syllable'];
282	for ($i = 1; $i < $count; $i++) {
283	if ($last_syllable != $info[$i]['syllable']) {
284	self::final_reordering_syllable($info, $GSUBdata, $scriptblock, $last, $i);
285	$last = $i;
286	$last_syllable = $info[$last]['syllable'];
287	}
288	}
289	self::final_reordering_syllable($info, $GSUBdata, $scriptblock, $last, $count);
290	}
291
292	public static function final_reordering_syllable(&$info, $GSUBdata, $scriptblock, $start, $end)
293	{
294	/*
295	* Nothing to do here at present!
296	*/
297	}
298
299	public static $sea_table = array(
300	/* New Tai Lue (1980..19DF) */
301
302	/* 1980 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
303	/* 1988 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
304	/* 1990 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
305	/* 1998 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
306	/* 19A0 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
307	/* 19A8 */ 3841, 3841, 3841, 3841, 3840, 3840, 3840, 3840,
308	/* 19B0 */ 2823, 2823, 2823, 2823, 2823, 775, 775, 775,
309	/* 19B8 */ 2823, 2823, 775, 2823, 2823, 2823, 2823, 2823,
310	/* 19C0 */ 2823, 3857, 3857, 3857, 3857, 3857, 3857, 3857,
311	/* 19C8 */ 3843, 3843, 3840, 3840, 3840, 3840, 3840, 3840,
312	/* 19D0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
313	/* 19D8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
314	/* Tai Tham (1A20..1AAF) */
315
316	/* 1A20 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
317	/* 1A28 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
318	/* 1A30 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
319	/* 1A38 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
320	/* 1A40 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
321	/* 1A48 */ 3841, 3841, 3841, 3841, 3841, 3842, 3842, 3842,
322	/* 1A50 */ 3842, 3842, 3842, 3841, 3841, 3857, 3857, 3857,
323	/* 1A58 */ 3857, 3857, 3857, 3857, 3857, 3857, 3857, 3840,
324	/* 1A60 */ 3844, 2823, 1543, 2823, 2823, 1543, 1543, 1543,
325	/* 1A68 */ 1543, 2055, 2055, 1543, 2055, 2823, 775, 775,
326	/* 1A70 */ 775, 775, 775, 1543, 1543, 3843, 3843, 3843,
327	/* 1A78 */ 3843, 3843, 3840, 3840, 3840, 3840, 3840, 3840,
328	/* 1A80 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
329	/* 1A88 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
330	/* 1A90 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
331	/* 1A98 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
332	/* 1AA0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
333	/* 1AA8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
334	/* Cham (AA00..AA5F) */
335
336	/* AA00 */ 3842, 3842, 3842, 3842, 3842, 3842, 3841, 3841,
337	/* AA08 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
338	/* AA10 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
339	/* AA18 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
340	/* AA20 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
341	/* AA28 */ 3841, 1543, 1543, 1543, 1543, 2055, 1543, 775,
342	/* AA30 */ 775, 1543, 2055, 3857, 3857, 3857, 3857, 3840,
343	/* AA38 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
344	/* AA40 */ 3857, 3857, 3857, 3857, 3857, 3857, 3857, 3857,
345	/* AA48 */ 3857, 3857, 3857, 3857, 3857, 3857, 3840, 3840,
346	/* AA50 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
347	/* AA58 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
348	);
349
350	public static function sea_get_categories($u)
351	{
352	if (0x1980 <= $u && $u <= 0x19DF)
353	return self::$sea_table[$u - 0x1980]; // offset 0 for New Tai Lue
354	if (0x1A20 <= $u && $u <= 0x1AAF)
355	return self::$sea_table[$u - 0x1A20 + 96]; // offset for Tai Tham
356	if (0xAA00 <= $u && $u <= 0xAA5F)
357	return self::$sea_table[$u - 0xAA00 + 96 + 144]; // Cham
358	if ($u == 0x00A0)
359	return 3851; // (ISC_CP \| (IMC_x << 8))
360	if ($u == 0x25CC)
361	return 3851; // (ISC_CP \| (IMC_x << 8))
362	return 3840; // (ISC_x \| (IMC_x << 8))
363	}
364
365	public static function bubble_sort(&$arr, $start, $len)
366	{
367	if ($len < 2) {
368	return;
369	}
370	$k = $start + $len - 2;
371	while ($k >= $start) {
372	for ($j = $start; $j <= $k; $j++) {
373	if ($arr[$j]['sea_position'] > $arr[$j + 1]['sea_position']) {
374	$t = $arr[$j];
375	$arr[$j] = $arr[$j + 1];
376	$arr[$j + 1] = $t;
377	}
378	}
379	$k--;
380	}
381	}
382
383	}
384