harfbuzz/src/gen-arabic-table.py

359 lines
9.9 KiB
Python
Executable File

#!/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 == */")