1 files changed, 271 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/gen-arabic-table.py b/gfx/harfbuzz/src/gen-arabic-table.py
new file mode 100755
index 0000000000..621d5b60c8
--- /dev/null
+++ b/gfx/harfbuzz/src/gen-arabic-table.py
@@ -0,0 +1,271 @@
+#!/usr/bin/env python3
+
+"""usage: ./gen-arabic-table.py ArabicShaping.txt UnicodeData.txt Blocks.txt
+
+Input files:
+* https://unicode.org/Public/UCD/latest/ucd/ArabicShaping.txt
+* https://unicode.org/Public/UCD/latest/ucd/UnicodeData.txt
+* https://unicode.org/Public/UCD/latest/ucd/Blocks.txt
+"""
+
+import os.path, sys
+
+if len (sys.argv) != 4:
+	sys.exit (__doc__)
+
+files = [open (x, encoding='utf-8') for x in sys.argv[1:]]
+
+headers = [[files[0].readline (), files[0].readline ()], [files[2].readline (), files[2].readline ()]]
+headers.append (["UnicodeData.txt does not have a header."])
+while files[0].readline ().find ('##################') < 0:
+	pass
+
+blocks = {}
+def read_blocks(f):
+	global blocks
+	for line in f:
+
+		j = line.find ('#')
+		if j >= 0:
+			line = line[:j]
+
+		fields = [x.strip () for x in line.split (';')]
+		if len (fields) == 1:
+			continue
+
+		uu = fields[0].split ('..')
+		start = int (uu[0], 16)
+		if len (uu) == 1:
+			end = start
+		else:
+			end = int (uu[1], 16)
+
+		t = fields[1]
+
+		for u in range (start, end + 1):
+			blocks[u] = t
+
+def print_joining_table(f):
+
+	values = {}
+	for line in f:
+
+		if line[0] == '#':
+			continue
+
+		fields = [x.strip () for x in line.split (';')]
+		if len (fields) == 1:
+			continue
+
+		u = int (fields[0], 16)
+
+		if fields[3] in ["ALAPH", "DALATH RISH"]:
+			value = "JOINING_GROUP_" + fields[3].replace(' ', '_')
+		else:
+			value = "JOINING_TYPE_" + fields[2]
+		values[u] = value
+
+	short_value = {}
+	for value in sorted (set ([v for v in values.values ()] + ['JOINING_TYPE_X'])):
+		short = ''.join(x[0] for x in value.split('_')[2:])
+		assert short not in short_value.values()
+		short_value[value] = short
+
+	print ()
+	for value,short in short_value.items():
+		print ("#define %s	%s" % (short, value))
+
+	uu = sorted(values.keys())
+	num = len(values)
+	all_blocks = set([blocks[u] for u in uu])
+
+	last = -100000
+	ranges = []
+	for u in uu:
+		if u - last <= 1+16*5:
+			ranges[-1][-1] = u
+		else:
+			ranges.append([u,u])
+		last = u
+
+	print ()
+	print ("static const uint8_t joining_table[] =")
+	print ("{")
+	last_block = None
+	offset = 0
+	for start,end in ranges:
+
+		print ()
+		print ("#define joining_offset_0x%04xu %d" % (start, offset))
+
+		for u in range(start, end+1):
+
+			block = blocks.get(u, last_block)
+			value = values.get(u, "JOINING_TYPE_X")
+
+			if block != last_block or u == start:
+				if u != start:
+					print ()
+				if block in all_blocks:
+					print ("\n  /* %s */" % block)
+				else:
+					print ("\n  /* FILLER */")
+				last_block = block
+				if u % 32 != 0:
+					print ()
+					print ("  /* %04X */" % (u//32*32), "  " * (u % 32), end="")
+
+			if u % 32 == 0:
+				print ()
+				print ("  /* %04X */ " % u, end="")
+			print ("%s," % short_value[value], end="")
+		print ()
+
+		offset += end - start + 1
+	print ()
+	occupancy = num * 100. / offset
+	print ("}; /* Table items: %d; occupancy: %d%% */" % (offset, occupancy))
+	print ()
+
+	page_bits = 12
+	print ()
+	print ("static unsigned int")
+	print ("joining_type (hb_codepoint_t u)")
+	print ("{")
+	print ("  switch (u >> %d)" % page_bits)
+	print ("  {")
+	pages = set([u>>page_bits for u in [s for s,e in ranges]+[e for s,e in ranges]])
+	for p in sorted(pages):
+		print ("    case 0x%0Xu:" % p)
+		for (start,end) in ranges:
+			if p not in [start>>page_bits, end>>page_bits]: continue
+			offset = "joining_offset_0x%04xu" % start
+			print ("      if (hb_in_range<hb_codepoint_t> (u, 0x%04Xu, 0x%04Xu)) return joining_table[u - 0x%04Xu + %s];" % (start, end, start, offset))
+		print ("      break;")
+		print ("")
+	print ("    default:")
+	print ("      break;")
+	print ("  }")
+	print ("  return X;")
+	print ("}")
+	print ()
+	for value,short in short_value.items():
+		print ("#undef %s" % (short))
+	print ()
+
+def print_shaping_table(f):
+
+	shapes = {}
+	ligatures = {}
+	names = {}
+	for line in f:
+
+		fields = [x.strip () for x in line.split (';')]
+		if fields[5][0:1] != '<':
+			continue
+
+		items = fields[5].split (' ')
+		shape, items = items[0][1:-1], tuple (int (x, 16) for x in items[1:])
+
+		if not shape in ['initial', 'medial', 'isolated', 'final']:
+			continue
+
+		c = int (fields[0], 16)
+		if len (items) != 1:
+			# We only care about lam-alef ligatures
+			if len (items) != 2 or items[0] != 0x0644 or items[1] not in [0x0622, 0x0623, 0x0625, 0x0627]:
+				continue
+
+			# Save ligature
+			names[c] = fields[1]
+			if items not in ligatures:
+				ligatures[items] = {}
+			ligatures[items][shape] = c
+		else:
+			# Save shape
+			if items[0] not in names:
+				names[items[0]] = fields[1]
+			else:
+				names[items[0]] = os.path.commonprefix ([names[items[0]], fields[1]]).strip ()
+			if items[0] not in shapes:
+				shapes[items[0]] = {}
+			shapes[items[0]][shape] = c
+
+	print ()
+	print ("static const uint16_t shaping_table[][4] =")
+	print ("{")
+
+	keys = shapes.keys ()
+	min_u, max_u = min (keys), max (keys)
+	for u in range (min_u, max_u + 1):
+		s = [shapes[u][shape] if u in shapes and shape in shapes[u] else 0
+		     for shape in  ['initial', 'medial', 'final', 'isolated']]
+		value = ', '.join ("0x%04Xu" % c for c in s)
+		print ("  {%s}, /* U+%04X %s */" % (value, u, names[u] if u in names else ""))
+
+	print ("};")
+	print ()
+	print ("#define SHAPING_TABLE_FIRST	0x%04Xu" % min_u)
+	print ("#define SHAPING_TABLE_LAST	0x%04Xu" % max_u)
+	print ()
+
+	ligas = {}
+	for pair in ligatures.keys ():
+		for shape in ligatures[pair]:
+			c = ligatures[pair][shape]
+			if shape == 'isolated':
+				liga = (shapes[pair[0]]['initial'], shapes[pair[1]]['final'])
+			elif shape == 'final':
+				liga = (shapes[pair[0]]['medial'], shapes[pair[1]]['final'])
+			else:
+				raise Exception ("Unexpected shape", shape)
+			if liga[0] not in ligas:
+				ligas[liga[0]] = []
+			ligas[liga[0]].append ((liga[1], c))
+	max_i = max (len (ligas[l]) for l in ligas)
+	print ()
+	print ("static const struct ligature_set_t {")
+	print (" uint16_t first;")
+	print (" struct ligature_pairs_t {")
+	print ("   uint16_t second;")
+	print ("   uint16_t ligature;")
+	print (" } ligatures[%d];" % max_i)
+	print ("} ligature_table[] =")
+	print ("{")
+	for first in sorted (ligas.keys ()):
+
+		print ("  { 0x%04Xu, {" % (first))
+		for liga in ligas[first]:
+			print ("    { 0x%04Xu, 0x%04Xu }, /* %s */" % (liga[0], liga[1], names[liga[1]]))
+		print ("  }},")
+
+	print ("};")
+	print ()
+
+
+
+print ("/* == Start of generated table == */")
+print ("/*")
+print (" * The following table is generated by running:")
+print (" *")
+print (" *   ./gen-arabic-table.py ArabicShaping.txt UnicodeData.txt Blocks.txt")
+print (" *")
+print (" * on files with these headers:")
+print (" *")
+for h in headers:
+	for l in h:
+		print (" * %s" % (l.strip()))
+print (" */")
+print ()
+print ("#ifndef HB_OT_SHAPE_COMPLEX_ARABIC_TABLE_HH")
+print ("#define HB_OT_SHAPE_COMPLEX_ARABIC_TABLE_HH")
+print ()
+
+read_blocks (files[2])
+print_joining_table (files[0])
+print_shaping_table (files[1])
+
+print ()
+print ("#endif /* HB_OT_SHAPE_COMPLEX_ARABIC_TABLE_HH */")
+print ()
+print ("/* == End of generated table == */")