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#! /usr/bin/env python
import sys
import string
import perfect_hash
# This is a user of perfect_hash.py
# that takes as input the UnicodeData.txt file available from:
# ftp://ftp.unicode.org/Public/UNIDATA/UnicodeData.txt
# It generates a hash table from Unicode Character Name ->
# unicode code space value.
# These variables determine which hash function is tried first.
# Yields a multiple of 1.7875 for UnicodeData.txt on 2000/06/24/
f1Seed = 1694245428
f2Seed = -1917331657
# Maximum allowed multipler, if this isn't None then instead of continually
# increasing C, it resets it back to initC to keep searching for
# a solution.
minC = 1.7875
# Initial multiplier for trying to find a perfect hash function.
initC = 1.7875
moduleName = "ucnhash"
dataArrayName = "aucn"
dataArrayType = "_Py_UnicodeCharacterName"
headerFileName = "ucnhash.h"
cFileName = "ucnhash.c"
structName = "_Py_UCNHashAPI"
keys = []
hashData = {}
def generateOutputFiles(perfHash, hashData):
header = perfHash.generate_header(structName)
header = header + """
typedef struct
{
const char *pszUCN;
Py_UCS4 value;
} _Py_UnicodeCharacterName;
"""
code = perfHash.generate_code(moduleName,
dataArrayName,
dataArrayType,
structName)
out = open(headerFileName, "w")
out.write(header)
out = open(cFileName, "w")
out.write("#include \"%s\"\n" % headerFileName)
out.write(code)
perfHash.generate_graph(out)
out.write("""
static const _Py_UnicodeCharacterName aucn[] =
{
""")
for i in xrange(len(keys)):
v = hashData[keys[i][0]]
out.write(' { "' + keys[i][0] + '", ' + hex(v) + " }," + "\n")
out.write("};\n\n")
sys.stderr.write('\nGenerated output files: \n')
sys.stderr.write('%s\n%s\n' % (headerFileName, cFileName))
def main():
# Suck in UnicodeData.txt and spit out the generated files.
input = open(sys.argv[1], 'r')
i = 0
while 1:
line = input.readline()
if line == "": break
fields = string.split(line, ';')
if len(fields) < 2:
sys.stderr.write('Ill-formated line!\n')
sys.stderr.write('line #: %d\n' % (i + 1))
sys.exit()
data, key = fields[:2]
key = string.strip( key )
# Any name starting with '<' is a control, or start/end character,
# so skip it...
if key[0] == "<":
continue
hashcode = i
i = i + 1
# force the name to uppercase
keys.append( (string.upper(key),hashcode) )
data = string.atoi(data, 16)
hashData[key] = data
input.close()
sys.stderr.write('%i key/hash pairs read\n' % len(keys) )
perfHash = perfect_hash.generate_hash(keys, 1,
minC, initC,
f1Seed, f2Seed,
# increment, tries
0.0025, 50)
generateOutputFiles(perfHash, hashData)
if __name__ == '__main__':
if len(sys.argv) == 1:
sys.stdout = sys.stderr
print 'Usage: %s <input filename>' % sys.argv[0]
print ' The input file needs to be UnicodeData.txt'
sys.exit()
main()
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