#!/usr/bin/python

import sys

if len (sys.argv) != 5:
	print >>sys.stderr, "usage: ./gen-use-table.py IndicSyllabicCategory.txt IndicPositionalCategory.txt UnicodeData.txt Blocks.txt"
	sys.exit (1)

BLACKLISTED_BLOCKS = ["Thai", "Lao", "Tibetan"]

files = [file (x) for x in sys.argv[1:]]

headers = [[f.readline () for i in range (2)] for j,f in enumerate(files) if j != 2]
headers.append (["UnicodeData.txt does not have a header."])

data = [{} for f in files]
values = [{} for f in files]
for i, f in enumerate (files):
	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 if i != 2 else 2]

		for u in range (start, end + 1):
			data[i][u] = t
		values[i][t] = values[i].get (t, 0) + end - start + 1

# Merge data into one dict:
defaults = ('Other', 'Not_Applicable', 'Cn', 'No_Block')
for i,v in enumerate (defaults):
	values[i][v] = values[i].get (v, 0) + 1
combined = {}
for i,d in enumerate (data):
	for u,v in d.items ():
		if i >= 2 and not u in combined:
			continue
		if not u in combined:
			combined[u] = list (defaults)
		combined[u][i] = v
combined = {k:v for k,v in combined.items() if v[3] not in BLACKLISTED_BLOCKS}
data = combined
del combined
num = len (data)


property_names = [
	# General_Category
	'Cc', 'Cf', 'Cn', 'Co', 'Cs', 'Ll', 'Lm', 'Lo', 'Lt', 'Lu', 'Mc',
	'Me', 'Mn', 'Nd', 'Nl', 'No', 'Pc', 'Pd', 'Pe', 'Pf', 'Pi', 'Po',
	'Ps', 'Sc', 'Sk', 'Sm', 'So', 'Zl', 'Zp', 'Zs',
	# Indic_Syllabic_Category
	'Other',
	'Bindu',
	'Visarga',
	'Avagraha',
	'Nukta',
	'Virama',
	'Pure_Killer',
	'Invisible_Stacker',
	'Vowel_Independent',
	'Vowel_Dependent',
	'Vowel',
	'Consonant_Placeholder',
	'Consonant',
	'Consonant_Dead',
	'Consonant_With_Stacker',
	'Consonant_Prefixed',
	'Consonant_Preceding_Repha',
	'Consonant_Succeeding_Repha',
	'Consonant_Subjoined',
	'Consonant_Medial',
	'Consonant_Final',
	'Consonant_Head_Letter',
	'Modifying_Letter',
	'Tone_Letter',
	'Tone_Mark',
	'Gemination_Mark',
	'Cantillation_Mark',
	'Register_Shifter',
	'Syllable_Modifier',
	'Consonant_Killer',
	'Non_Joiner',
	'Joiner',
	'Number_Joiner',
	'Number',
	'Brahmi_Joining_Number',
	# Indic_Positional_Category
	'Not_Applicable'
	'Right',
	'Left',
	'Visual_Order_Left',
	'Left_And_Right',
	'Top',
	'Bottom',
	'Top_And_Bottom',
	'Top_And_Right',
	'Top_And_Left',
	'Top_And_Left_And_Right',
	'Bottom_And_Right',
	'Top_And_Bottom_And_Right',
	'Overstruck',
]

class PropertyValue(object):
	def __init__(self, name_):
		self.name = name_
	def __str__(self):
		return self.name
	def __eq__(self, other):
		assert isinstance(other, basestring)
		return self.name == other
	def __ne__(self, other):
		return not (self == other)

property_values = {}

for name in property_names:
	value = PropertyValue(name)
	assert value not in property_values
	assert value not in globals()
	property_values[name] = value
globals().update(property_values)


def is_BASE(U, UISC, UGC):
	return (UISC in [Number, Consonant, Consonant_Head_Letter,
			#SPEC-OUTDATED Consonant_Placeholder,
			Tone_Letter] or
		(UGC == Lo and UISC in [Avagraha, Bindu, Consonant_Final, Consonant_Medial,
					Consonant_Subjoined, Vowel, Vowel_Dependent]))
def is_BASE_VOWEL(U, UISC, UGC):
	return UISC == Vowel_Independent
def is_BASE_IND(U, UISC, UGC):
	#SPEC-BROKEN return (UISC in [Consonant_Dead, Modifying_Letter] or UGC == Po)
	return (UISC in [Consonant_Dead, Modifying_Letter] or
		(UGC == Po and not is_BASE_OTHER(U, UISC, UGC))) # for 104E
def is_BASE_NUM(U, UISC, UGC):
	return UISC == Brahmi_Joining_Number
def is_BASE_OTHER(U, UISC, UGC):
	if UISC == Consonant_Placeholder: return True #SPEC-OUTDATED
	return U in [0x00A0, 0x00D7, 0x2015, 0x2022, 0x25CC,
		     0x25FB, 0x25FC, 0x25FD, 0x25FE]
def is_CGJ(U, UISC, UGC):
	return U == 0x034F
def is_CONS_FINAL(U, UISC, UGC):
	return ((UISC == Consonant_Final and UGC != Lo) or
		UISC == Consonant_Succeeding_Repha)
def is_CONS_FINAL_MOD(U, UISC, UGC):
	#SPEC-OUTDATED return  UISC in [Consonant_Final_Modifier, Syllable_Modifier]
	return  UISC == Syllable_Modifier
def is_CONS_MED(U, UISC, UGC):
	return UISC == Consonant_Medial and UGC != Lo
def is_CONS_MOD(U, UISC, UGC):
	return UISC in [Nukta, Gemination_Mark, Consonant_Killer]
def is_CONS_SUB(U, UISC, UGC):
	#SPEC-OUTDATED return UISC == Consonant_Subjoined
	return UISC == Consonant_Subjoined and UGC != Lo
def is_HALANT(U, UISC, UGC):
	return UISC in [Virama, Invisible_Stacker]
def is_HALANT_NUM(U, UISC, UGC):
	return UISC == Number_Joiner
def is_ZWNJ(U, UISC, UGC):
	return UISC == Non_Joiner
def is_ZWJ(U, UISC, UGC):
	return UISC == Joiner
def is_Word_Joiner(U, UISC, UGC):
	return U == 0x2060
def is_OTHER(U, UISC, UGC):
	#SPEC-OUTDATED return UGC == Zs # or any other SCRIPT_COMMON characters
	return UISC == Other and not is_SYM_MOD(U, UISC, UGC)
def is_Reserved(U, UISC, UGC):
	return UGC == 'Cn'
def is_REPHA(U, UISC, UGC):
	#return UISC == Consonant_Preceding_Repha
	#SPEC-OUTDATED hack to categorize Consonant_With_Stacker and Consonant_Prefixed
	return UISC in [Consonant_Preceding_Repha, Consonant_With_Stacker, Consonant_Prefixed]
def is_SYM(U, UISC, UGC):
	if U == 0x25CC: return False #SPEC-OUTDATED
	#SPEC-OUTDATED return UGC in [So, Sc] or UISC == Symbol_Letter
	return UGC in [So, Sc]
def is_SYM_MOD(U, UISC, UGC):
	return U in [0x1B6B, 0x1B6C, 0x1B6D, 0x1B6E, 0x1B6F, 0x1B70, 0x1B71, 0x1B72, 0x1B73]
def is_VARIATION_SELECTOR(U, UISC, UGC):
	return 0xFE00 <= U <= 0xFE0F
def is_VOWEL(U, UISC, UGC):
	return (UISC == Pure_Killer or
		(UGC != Lo and UISC in [Vowel, Vowel_Dependent]))
def is_VOWEL_MOD(U, UISC, UGC):
	return (UISC in [Tone_Mark, Cantillation_Mark, Register_Shifter, Visarga] or
		(UGC != Lo and UISC == Bindu))

use_mapping = {
	'B':	is_BASE,
	'IV':	is_BASE_VOWEL,
	'IND':	is_BASE_IND,
	'N':	is_BASE_NUM,
	'GB':	is_BASE_OTHER,
	'CGJ':	is_CGJ,
	'F':	is_CONS_FINAL,
	'FM':	is_CONS_FINAL_MOD,
	'M':	is_CONS_MED,
	'CM':	is_CONS_MOD,
	'SUB':	is_CONS_SUB,
	'H':	is_HALANT,
	'HN':	is_HALANT_NUM,
	'ZWNJ':	is_ZWNJ,
	'ZWJ':	is_ZWJ,
	'WJ':	is_Word_Joiner,
	'O':	is_OTHER,
	'Rsv':	is_Reserved,
	'R':	is_REPHA,
	'S':	is_SYM,
	'SM':	is_SYM_MOD,
	'VS':	is_VARIATION_SELECTOR,
	'V':	is_VOWEL,
	'VM':	is_VOWEL_MOD,
}

def map_to_use(data):
	out = {}
	items = use_mapping.items()
	for U,(UISC,UIPC,UGC,UBlock) in data.items():
		evals = [(k, v(U,UISC,UGC)) for k,v in items]
		values = [k for k,v in evals if v]
		assert len(values) == 1, "%s %s %s %s" % (hex(U), UISC, UGC, values)
		out[U] = (values[0], UBlock)
	return out

defaults = ('O', 'No_Block')
data = map_to_use(data)

# Remove the outliers
singles = {}
for u in [0x25CC, 0x1107F]:
	singles[u] = data[u]
	del data[u]

print "/* == Start of generated table == */"
print "/*"
print " * The following table is generated by running:"
print " *"
print " *   ./gen-use-table.py IndicSyllabicCategory.txt IndicPositionalCategory.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 '#include "hb-ot-shape-complex-use-private.hh"'
print

total = 0
used = 0
last_block = None
def print_block (block, start, end, data):
	global total, used, last_block
	if block and block != last_block:
		print
		print
		print "  /* %s */" % block
		if start % 16:
			print ' ' * (20 + (start % 16 * 4)),
	num = 0
	assert start % 8 == 0
	assert (end+1) % 8 == 0
	for u in range (start, end+1):
		if u % 16 == 0:
			print
			print "  /* %04X */" % u,
		if u in data:
			num += 1
		d = data.get (u, defaults)
		sys.stdout.write ("%4s," % d[0])

	total += end - start + 1
	used += num
	if block:
		last_block = block

uu = data.keys ()
uu.sort ()

last = -100000
num = 0
offset = 0
starts = []
ends = []
for k,v in sorted(use_mapping.items()):
	print "#define %s	USE_%s	/* %s */" % (k, k, v.__name__[3:])
print ""
print "static const USE_TABLE_ELEMENT_TYPE use_table[] = {"
for u in uu:
	if u <= last:
		continue
	block = data[u][1]

	start = u//8*8
	end = start+1
	while end in uu and block == data[end][1]:
		end += 1
	end = (end-1)//8*8 + 7

	if start != last + 1:
		if start - last <= 1+16*3:
			print_block (None, last+1, start-1, data)
			last = start-1
		else:
			if last >= 0:
				ends.append (last + 1)
				offset += ends[-1] - starts[-1]
			print
			print
			print "#define use_offset_0x%04xu %d" % (start, offset)
			starts.append (start)

	print_block (block, start, end, data)
	last = end
ends.append (last + 1)
offset += ends[-1] - starts[-1]
print
print
occupancy = used * 100. / total
page_bits = 12
print "}; /* Table items: %d; occupancy: %d%% */" % (offset, occupancy)
print
print "USE_TABLE_ELEMENT_TYPE"
print "hb_use_get_categories (hb_codepoint_t u)"
print "{"
print "  switch (u >> %d)" % page_bits
print "  {"
pages = set([u>>page_bits for u in starts+ends+singles.keys()])
for p in sorted(pages):
	print "    case 0x%0Xu:" % p
	for (start,end) in zip (starts, ends):
		if p not in [start>>page_bits, end>>page_bits]: continue
		offset = "use_offset_0x%04xu" % start
		print "      if (hb_in_range (u, 0x%04Xu, 0x%04Xu)) return use_table[u - 0x%04Xu + %s];" % (start, end-1, start, offset)
	for u,d in singles.items ():
		if p != u>>page_bits: continue
		print "      if (unlikely (u == 0x%04Xu)) return %s;" % (u, d[0])
	print "      break;"
	print ""
print "    default:"
print "      break;"
print "  }"
print "  return _(x,x);"
print "}"
print ""
for k in sorted(use_mapping.keys()):
	print "#undef %s" % k
print
print "/* == End of generated table == */"

# Maintain at least 50% occupancy in the table */
if occupancy < 50:
	raise Exception ("Table too sparse, please investigate: ", occupancy)