The Tor Browser: gfx/harfbuzz/src/gen-arabic-table.py@925c144e1f1f (annotated)

gfx/harfbuzz/src/gen-arabic-table.py@925c144e1f1f (annotated)

gfx/harfbuzz/src/gen-arabic-table.py

Fri, 16 Jan 2015 18:13:44 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 18:13:44 +0100
branch: TOR_BUG_9701
changeset 14: 925c144e1f1f
permissions: -rwxr-xr-x

Integrate suggestion from review to improve consistency with existing code.

 #!/usr/bin/python
 import sys
 import os.path
 if len (sys.argv) != 3:
 	print >>sys.stderr, "usage: ./gen-arabic-table.py ArabicShaping.txt UnicodeData.txt"
 	sys.exit (1)
 files = [file (x) for x in sys.argv[1:]]
 headers = [[files[0].readline (), files[0].readline ()]]
 headers.append (["UnicodeData.txt does not have a header."])
 while files[0].readline ().find ('##################') < 0:
 	pass
 def print_joining_table(f):
 	print
 	print "static const uint8_t joining_table[] ="
 	print "{"
 	min_u = 0x110000
 	max_u = 0
 	num = 0
 	last = -1
 	block = ''
 	for line in f:
 		if line[0] == '#':
 			if line.find (" characters"):
 				block = line[2:].strip ()
 			continue
 		fields = [x.strip () for x in line.split (';')]
 		if len (fields) == 1:
 			continue
 		u = int (fields[0], 16)
 		if u == 0x200C or u == 0x200D:
 			continue
 		if u < last:
 			raise Exception ("Input data character not sorted", u)
 		min_u = min (min_u, u)
 		max_u = max (max_u, u)
 		num += 1
 		if block:
 			print "\n  /* %s */\n" % block
 			block = ''
 		if last != -1:
 			last += 1
 			while last < u:
 				print "  JOINING_TYPE_X, /* %04X */" % last
 				last += 1
 		else:
 			last = u
 		if fields[3] in ["ALAPH", "DALATH RISH"]:
 			value = "JOINING_GROUP_" + fields[3].replace(' ', '_')
 		else:
 			value = "JOINING_TYPE_" + fields[2]
 		print "  %s, /* %s */" % (value, '; '.join(fields))
 	print
 	print "};"
 	print
 	print "#define JOINING_TABLE_FIRST	0x%04X" % min_u
 	print "#define JOINING_TABLE_LAST	0x%04X" % max_u
 	print
 	occupancy = num * 100 / (max_u - min_u + 1)
 	# Maintain at least 40% occupancy in the table */
 	if occupancy < 40:
 		raise Exception ("Table too sparse, please investigate: ", occupancy)
 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
 			pass
 		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%04X" % 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%04X" % min_u
 	print "#define SHAPING_TABLE_LAST	0x%04X" % 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 "{"
 	keys = ligas.keys ()
 	keys.sort ()
 	for first in keys:
 		print "  { 0x%04X, {" % (first)
 		for liga in ligas[first]:
 			print "    { 0x%04X, 0x%04X }, /* %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"
 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
 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 == */"

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gfx/harfbuzz/src/gen-arabic-table.py@925c144e1f1f (annotated)

gfx/harfbuzz/src/gen-arabic-table.py