tor-browser

gen-arabic-table.py (10092B)

---

#!/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 ()

LIGATURES = (
0xF2EE, 0xFC08, 0xFC0E, 0xFC12, 0xFC32, 0xFC3F, 0xFC40, 0xFC41, 0xFC42,
0xFC44, 0xFC4E, 0xFC5E, 0xFC60, 0xFC61, 0xFC62, 0xFC6A, 0xFC6D, 0xFC6F,
0xFC70, 0xFC73, 0xFC75, 0xFC86, 0xFC8F, 0xFC91, 0xFC94, 0xFC9C, 0xFC9D,
0xFC9E, 0xFC9F, 0xFCA1, 0xFCA2, 0xFCA3, 0xFCA4, 0xFCA8, 0xFCAA, 0xFCAC,
0xFCB0, 0xFCC9, 0xFCCA, 0xFCCB, 0xFCCC, 0xFCCD, 0xFCCE, 0xFCCF, 0xFCD0,
0xFCD1, 0xFCD2, 0xFCD3, 0xFCD5, 0xFCDA, 0xFCDB, 0xFCDC, 0xFCDD, 0xFD30,
0xFD88, 0xFEF5, 0xFEF6, 0xFEF7, 0xFEF8, 0xFEF9, 0xFEFA, 0xFEFB, 0xFEFC,
0xF201, 0xF211, 0xF2EE,
)

def print_shaping_table(f):

shapes = {}
ligatures = {}
names = {}
lines = f.readlines()
lines += [
	"F201;PUA ARABIC LIGATURE LELLAH ISOLATED FORM;Lo;0;AL;<isolated> 0644 0644 0647;;;;N;;;;;",
	"F211;PUA ARABIC LIGATURE LAM WITH MEEM WITH JEEM INITIAL FORM;Lo;0;AL;<initial> 0644 0645 062C;;;;N;;;;;",
	"F2EE;PUA ARABIC LIGATURE SHADDA WITH FATHATAN ISOLATED FORM;Lo;0;AL;<isolated> 0020 064B 0651;;;;N;;;;;",
]
for line in lines:

	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:])
	c = int (fields[0], 16)

	if not shape in ['initial', 'medial', 'isolated', 'final']:
		continue

	if len (items) != 1:
		# Mark ligatures start with space and are in visual order, so we
		# remove the space and reverse the items.
		if items[0] == 0x0020:
			items = items[:0:-1]
			shape = None
		# We only care about a subset of ligatures
		if c not in LIGATURES:
			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_2 = {}
ligas_3 = {}
ligas_mark_2 = {}
for key in ligatures.keys ():
	for shape in ligatures[key]:
		c = ligatures[key][shape]
		if len(key) == 3:
			if shape == 'isolated':
				liga = (shapes[key[0]]['initial'], shapes[key[1]]['medial'], shapes[key[2]]['final'])
			elif shape == 'final':
				liga = (shapes[key[0]]['medial'], shapes[key[1]]['medial'], shapes[key[2]]['final'])
			elif shape == 'initial':
				liga = (shapes[key[0]]['initial'], shapes[key[1]]['medial'], shapes[key[2]]['medial'])
			else:
				raise Exception ("Unexpected shape", shape)
			if liga[0] not in ligas_3:
				ligas_3[liga[0]] = []
			ligas_3[liga[0]].append ((liga[1], liga[2], c))
		elif len(key) == 2:
			if shape is None:
				liga = key
				if liga[0] not in ligas_mark_2:
					ligas_mark_2[liga[0]] = []
				ligas_mark_2[liga[0]].append ((liga[1], c))
				continue
			elif shape == 'isolated':
				liga = (shapes[key[0]]['initial'], shapes[key[1]]['final'])
			elif shape == 'final':
				liga = (shapes[key[0]]['medial'], shapes[key[1]]['final'])
			elif shape == 'initial':
				liga = (shapes[key[0]]['initial'], shapes[key[1]]['medial'])
			else:
				raise Exception ("Unexpected shape", shape)
			if liga[0] not in ligas_2:
				ligas_2[liga[0]] = []
			ligas_2[liga[0]].append ((liga[1], c))
		else:
			raise Exception ("Unexpected number of ligature components", key)
max_i = max (len (ligas_2[l]) for l in ligas_2)
print ()
print ("static const struct ligature_set_t {")
print (" uint16_t first;")
print (" struct ligature_pairs_t {")
print ("   uint16_t components[1];")
print ("   uint16_t ligature;")
print (" } ligatures[%d];" % max_i)
print ("} ligature_table[] =")
print ("{")
for first in sorted (ligas_2.keys ()):

	print ("  { 0x%04Xu, {" % (first))
	for liga in ligas_2[first]:
		print ("    { {0x%04Xu}, 0x%04Xu }, /* %s */" % (liga[0], liga[1], names[liga[1]]))
	print ("  }},")

print ("};")
print ()

max_i = max (len (ligas_mark_2[l]) for l in ligas_mark_2)
print ()
print ("static const struct ligature_mark_set_t {")
print (" uint16_t first;")
print (" struct ligature_pairs_t {")
print ("   uint16_t components[1];")
print ("   uint16_t ligature;")
print (" } ligatures[%d];" % max_i)
print ("} ligature_mark_table[] =")
print ("{")
for first in sorted (ligas_mark_2.keys ()):

	print ("  { 0x%04Xu, {" % (first))
	for liga in ligas_mark_2[first]:
		print ("    { {0x%04Xu}, 0x%04Xu }, /* %s */" % (liga[0], liga[1], names[liga[1]]))
	print ("  }},")

print ("};")
print ()

max_i = max (len (ligas_3[l]) for l in ligas_3)
print ()
print ("static const struct ligature_3_set_t {")
print (" uint16_t first;")
print (" struct ligature_triplets_t {")
print ("   uint16_t components[2];")
print ("   uint16_t ligature;")
print (" } ligatures[%d];" % max_i)
print ("} ligature_3_table[] =")
print ("{")
for first in sorted (ligas_3.keys ()):

	print ("  { 0x%04Xu, {" % (first))
	for liga in ligas_3[first]:
		print ("    { {0x%04Xu, 0x%04Xu}, 0x%04Xu}, /* %s */" % (liga[0], liga[1], liga[2], names[liga[2]]))
	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_SHAPER_ARABIC_TABLE_HH")
print ("#define HB_OT_SHAPER_ARABIC_TABLE_HH")
print ()

read_blocks (files[2])
print_joining_table (files[0])
print_shaping_table (files[1])

print ()
print ("#endif /* HB_OT_SHAPER_ARABIC_TABLE_HH */")
print ()
print ("/* == End of generated table == */")