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cpython/Tools/unicode/makeunicodedata.py

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#
# (re)generate unicode property and type databases
#
# this script converts a unicode 3.0 database file to
# Modules/unicodedata_db.h and Objects/unicodetype_db.h
#
# history:
# 2000-09-24 fl created (based on bits and pieces from unidb)
# 2000-09-25 fl merged tim's splitbin fixes, separate decomposition table
# 2000-09-25 fl added character type table
# 2000-09-26 fl added LINEBREAK, DECIMAL, and DIGIT flags/fields
#
# written by Fredrik Lundh (fredrik@pythonware.com), September 2000
#
import sys
SCRIPT = sys.argv[0]
VERSION = "1.1"
UNICODE_DATA = "UnicodeData-Latest.txt"
CATEGORY_NAMES = [ "Cn", "Lu", "Ll", "Lt", "Mn", "Mc", "Me", "Nd",
"Nl", "No", "Zs", "Zl", "Zp", "Cc", "Cf", "Cs", "Co", "Cn", "Lm",
"Lo", "Pc", "Pd", "Ps", "Pe", "Pi", "Pf", "Po", "Sm", "Sc", "Sk",
"So" ]
BIDIRECTIONAL_NAMES = [ "", "L", "LRE", "LRO", "R", "AL", "RLE", "RLO",
"PDF", "EN", "ES", "ET", "AN", "CS", "NSM", "BN", "B", "S", "WS",
"ON" ]
# note: should match definitions in Objects/unicodectype.c
ALPHA_MASK = 0x01
DECIMAL_MASK = 0x02
DIGIT_MASK = 0x04
LOWER_MASK = 0x08
LINEBREAK_MASK = 0x10
SPACE_MASK = 0x20
TITLE_MASK = 0x40
UPPER_MASK = 0x80
def maketables():
unicode = UnicodeData(UNICODE_DATA)
# extract unicode properties
dummy = (0, 0, 0, 0)
table = [dummy]
cache = {0: dummy}
index = [0] * len(unicode.chars)
# 1) database properties
for char in unicode.chars:
record = unicode.table[char]
if record:
# extract database properties
category = CATEGORY_NAMES.index(record[2])
combining = int(record[3])
bidirectional = BIDIRECTIONAL_NAMES.index(record[4])
mirrored = record[9] == "Y"
item = (
category, combining, bidirectional, mirrored
)
# add entry to index and item tables
i = cache.get(item)
if i is None:
cache[item] = i = len(table)
table.append(item)
index[char] = i
# 2) decomposition data
# FIXME: <fl> using the encoding stuff from unidb would save
# another 50k or so, but I'll leave that for 2.1...
decomp_data = [""]
decomp_index = [0] * len(unicode.chars)
for char in unicode.chars:
record = unicode.table[char]
if record:
if record[5]:
try:
i = decomp_data.index(record[5])
except ValueError:
i = len(decomp_data)
decomp_data.append(record[5])
else:
i = 0
decomp_index[char] = i
FILE = "Modules/unicodedata_db.h"
fp = open(FILE, "w")
print >>fp, "/* this file was generated by %s %s */" % (SCRIPT, VERSION)
print >>fp
print >>fp, "/* a list of unique database records */"
print >>fp, \
"const _PyUnicode_DatabaseRecord _PyUnicode_Database_Records[] = {"
for item in table:
print >>fp, " {%d, %d, %d, %d}," % item
print >>fp, "};"
print >>fp
# FIXME: the following tables should be made static, and
# the support code moved into unicodedatabase.c
print >>fp, "/* string literals */"
print >>fp, "const char *_PyUnicode_CategoryNames[] = {"
for name in CATEGORY_NAMES:
print >>fp, " \"%s\"," % name
print >>fp, " NULL"
print >>fp, "};"
print >>fp, "const char *_PyUnicode_BidirectionalNames[] = {"
for name in BIDIRECTIONAL_NAMES:
print >>fp, " \"%s\"," % name
print >>fp, " NULL"
print >>fp, "};"
print >>fp, "static const char *decomp_data[] = {"
for name in decomp_data:
print >>fp, " \"%s\"," % name
print >>fp, " NULL"
print >>fp, "};"
# split record index table
index1, index2, shift = splitbins(index)
print >>fp, "/* index tables for the database records */"
print >>fp, "#define SHIFT", shift
Array("index1", index1).dump(fp)
Array("index2", index2).dump(fp)
# split decomposition index table
index1, index2, shift = splitbins(decomp_index)
print >>fp, "/* index tables for the decomposition data */"
print >>fp, "#define DECOMP_SHIFT", shift
Array("decomp_index1", index1).dump(fp)
Array("decomp_index2", index2).dump(fp)
#
# 3) unicode type data
# extract unicode types
dummy = (0, 0, 0, 0, 0, 0)
table = [dummy]
cache = {0: dummy}
index = [0] * len(unicode.chars)
for char in unicode.chars:
record = unicode.table[char]
if record:
# extract database properties
category = record[2]
bidirectional = record[4]
flags = 0
if category in ["Lm", "Lt", "Lu", "Ll", "Lo"]:
flags |= ALPHA_MASK
if category == "Ll":
flags |= LOWER_MASK
if category == "Zl" or bidirectional == "B":
flags |= LINEBREAK_MASK
if category == "Zs" or bidirectional in ("WS", "B", "S"):
flags |= SPACE_MASK
if category == "Lt":
flags |= TITLE_MASK
if category == "Lu":
flags |= UPPER_MASK
# use delta predictor for upper/lower/title
if record[12]:
upper = (int(record[12], 16) - char) & 0xffff
else:
upper = 0
if record[13]:
lower = (int(record[13], 16) - char) & 0xffff
else:
lower = 0
if record[14]:
title = (int(record[14], 16) - char) & 0xffff
else:
title = 0
# decimal digit, integer digit
decimal = 0
if record[6]:
flags |= DECIMAL_MASK
decimal = int(record[6])
digit = 0
if record[7]:
flags |= DIGIT_MASK
digit = int(record[7])
item = (
flags, upper, lower, title, decimal, digit
)
# add entry to index and item tables
i = cache.get(item)
if i is None:
cache[item] = i = len(table)
table.append(item)
index[char] = i
print len(table), "ctype entries"
FILE = "Objects/unicodetype_db.h"
fp = open(FILE, "w")
print >>fp, "/* this file was generated by %s %s */" % (SCRIPT, VERSION)
print >>fp
print >>fp, "/* a list of unique character type descriptors */"
print >>fp, "const _PyUnicode_TypeRecord _PyUnicode_TypeRecords[] = {"
for item in table:
print >>fp, " {%d, %d, %d, %d, %d, %d}," % item
print >>fp, "};"
print >>fp
# split decomposition index table
index1, index2, shift = splitbins(index)
print >>fp, "/* type indexes */"
print >>fp, "#define SHIFT", shift
Array("index1", index1).dump(fp)
Array("index2", index2).dump(fp)
# --------------------------------------------------------------------
# the following support code is taken from the unidb utilities
# Copyright (c) 1999-2000 by Secret Labs AB
# load a unicode-data file from disk
import string, sys
class UnicodeData:
def __init__(self, filename):
file = open(filename)
table = [None] * 65536
while 1:
s = file.readline()
if not s:
break
s = string.split(string.strip(s), ";")
char = string.atoi(s[0], 16)
table[char] = s
# public attributes
self.filename = filename
self.table = table
self.chars = range(65536) # unicode
def uselatin1(self):
# restrict character range to ISO Latin 1
self.chars = range(256)
# stuff to deal with arrays of unsigned integers
class Array:
def __init__(self, name, data):
self.name = name
self.data = data
def dump(self, file):
# write data to file, as a C array
size = getsize(self.data)
# print >>sys.stderr, self.name+":", size*len(self.data), "bytes"
file.write("static ")
if size == 1:
file.write("unsigned char")
elif size == 2:
file.write("unsigned short")
else:
file.write("unsigned int")
file.write(" " + self.name + "[] = {\n")
if self.data:
s = " "
for item in self.data:
i = str(item) + ", "
if len(s) + len(i) > 78:
file.write(s + "\n")
s = " " + i
else:
s = s + i
if string.strip(s):
file.write(s + "\n")
file.write("};\n\n")
def getsize(data):
# return smallest possible integer size for the given array
maxdata = max(data)
if maxdata < 256:
return 1
elif maxdata < 65536:
return 2
else:
return 4
def splitbins(t, trace=0):
"""t, trace=0 -> (t1, t2, shift). Split a table to save space.
t is a sequence of ints. This function can be useful to save space if
many of the ints are the same. t1 and t2 are lists of ints, and shift
is an int, chosen to minimize the combined size of t1 and t2 (in C
code), and where for each i in range(len(t)),
t[i] == t2[(t1[i >> shift] << shift) + (i & mask)]
where mask is a bitmask isolating the last "shift" bits.
If optional arg trace is true (default false), progress info is
printed to sys.stderr.
"""
import sys
if trace:
def dump(t1, t2, shift, bytes):
print >>sys.stderr, "%d+%d bins at shift %d; %d bytes" % (
len(t1), len(t2), shift, bytes)
print >>sys.stderr, "Size of original table:", len(t)*getsize(t), \
"bytes"
n = len(t)-1 # last valid index
maxshift = 0 # the most we can shift n and still have something left
if n > 0:
while n >> 1:
n >>= 1
maxshift += 1
del n
bytes = sys.maxint # smallest total size so far
t = tuple(t) # so slices can be dict keys
for shift in range(maxshift + 1):
t1 = []
t2 = []
size = 2**shift
bincache = {}
for i in range(0, len(t), size):
bin = t[i:i+size]
index = bincache.get(bin)
if index is None:
index = len(t2)
bincache[bin] = index
t2.extend(bin)
t1.append(index >> shift)
# determine memory size
b = len(t1)*getsize(t1) + len(t2)*getsize(t2)
if trace:
dump(t1, t2, shift, b)
if b < bytes:
best = t1, t2, shift
bytes = b
t1, t2, shift = best
if trace:
print >>sys.stderr, "Best:",
dump(t1, t2, shift, bytes)
if __debug__:
# exhaustively verify that the decomposition is correct
mask = ~((~0) << shift) # i.e., low-bit mask of shift bits
for i in xrange(len(t)):
assert t[i] == t2[(t1[i >> shift] << shift) + (i & mask)]
return best
if __name__ == "__main__":
maketables()
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