944 lines
31 KiB
Python
944 lines
31 KiB
Python
#
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# (re)generate unicode property and type databases
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#
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# this script converts a unicode 3.2 database file to
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# Modules/unicodedata_db.h, Modules/unicodename_db.h,
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# and Objects/unicodetype_db.h
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#
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# history:
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# 2000-09-24 fl created (based on bits and pieces from unidb)
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# 2000-09-25 fl merged tim's splitbin fixes, separate decomposition table
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# 2000-09-25 fl added character type table
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# 2000-09-26 fl added LINEBREAK, DECIMAL, and DIGIT flags/fields (2.0)
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# 2000-11-03 fl expand first/last ranges
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# 2001-01-19 fl added character name tables (2.1)
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# 2001-01-21 fl added decomp compression; dynamic phrasebook threshold
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# 2002-09-11 wd use string methods
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# 2002-10-18 mvl update to Unicode 3.2
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# 2002-10-22 mvl generate NFC tables
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# 2002-11-24 mvl expand all ranges, sort names version-independently
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# 2002-11-25 mvl add UNIDATA_VERSION
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# 2004-05-29 perky add east asian width information
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# 2006-03-10 mvl update to Unicode 4.1; add UCD 3.2 delta
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#
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# written by Fredrik Lundh (fredrik@pythonware.com)
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#
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import sys
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SCRIPT = sys.argv[0]
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VERSION = "2.5"
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# The Unicode Database
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UNIDATA_VERSION = "4.1.0"
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UNICODE_DATA = "UnicodeData%s.txt"
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COMPOSITION_EXCLUSIONS = "CompositionExclusions%s.txt"
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EASTASIAN_WIDTH = "EastAsianWidth%s.txt"
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old_versions = ["3.2.0"]
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CATEGORY_NAMES = [ "Cn", "Lu", "Ll", "Lt", "Mn", "Mc", "Me", "Nd",
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"Nl", "No", "Zs", "Zl", "Zp", "Cc", "Cf", "Cs", "Co", "Cn", "Lm",
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"Lo", "Pc", "Pd", "Ps", "Pe", "Pi", "Pf", "Po", "Sm", "Sc", "Sk",
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"So" ]
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BIDIRECTIONAL_NAMES = [ "", "L", "LRE", "LRO", "R", "AL", "RLE", "RLO",
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"PDF", "EN", "ES", "ET", "AN", "CS", "NSM", "BN", "B", "S", "WS",
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"ON" ]
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EASTASIANWIDTH_NAMES = [ "F", "H", "W", "Na", "A", "N" ]
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# note: should match definitions in Objects/unicodectype.c
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ALPHA_MASK = 0x01
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DECIMAL_MASK = 0x02
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DIGIT_MASK = 0x04
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LOWER_MASK = 0x08
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LINEBREAK_MASK = 0x10
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SPACE_MASK = 0x20
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TITLE_MASK = 0x40
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UPPER_MASK = 0x80
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def maketables(trace=0):
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print "--- Reading", UNICODE_DATA % "", "..."
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version = ""
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unicode = UnicodeData(UNICODE_DATA % version,
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COMPOSITION_EXCLUSIONS % version,
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EASTASIAN_WIDTH % version)
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print len(filter(None, unicode.table)), "characters"
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for version in old_versions:
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print "--- Reading", UNICODE_DATA % ("-"+version), "..."
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old_unicode = UnicodeData(UNICODE_DATA % ("-"+version),
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COMPOSITION_EXCLUSIONS % ("-"+version),
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EASTASIAN_WIDTH % ("-"+version))
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print len(filter(None, old_unicode.table)), "characters"
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merge_old_version(version, unicode, old_unicode)
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makeunicodename(unicode, trace)
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makeunicodedata(unicode, trace)
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makeunicodetype(unicode, trace)
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# --------------------------------------------------------------------
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# unicode character properties
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def makeunicodedata(unicode, trace):
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dummy = (0, 0, 0, 0, 0)
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table = [dummy]
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cache = {0: dummy}
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index = [0] * len(unicode.chars)
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FILE = "Modules/unicodedata_db.h"
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print "--- Preparing", FILE, "..."
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# 1) database properties
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for char in unicode.chars:
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record = unicode.table[char]
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if record:
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# extract database properties
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category = CATEGORY_NAMES.index(record[2])
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combining = int(record[3])
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bidirectional = BIDIRECTIONAL_NAMES.index(record[4])
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mirrored = record[9] == "Y"
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eastasianwidth = EASTASIANWIDTH_NAMES.index(record[15])
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item = (
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category, combining, bidirectional, mirrored, eastasianwidth
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)
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# add entry to index and item tables
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i = cache.get(item)
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if i is None:
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cache[item] = i = len(table)
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table.append(item)
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index[char] = i
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# 2) decomposition data
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decomp_data = [0]
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decomp_prefix = [""]
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decomp_index = [0] * len(unicode.chars)
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decomp_size = 0
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comp_pairs = []
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comp_first = [None] * len(unicode.chars)
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comp_last = [None] * len(unicode.chars)
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for char in unicode.chars:
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record = unicode.table[char]
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if record:
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if record[5]:
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decomp = record[5].split()
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if len(decomp) > 19:
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raise Exception, "character %x has a decomposition too large for nfd_nfkd" % char
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# prefix
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if decomp[0][0] == "<":
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prefix = decomp.pop(0)
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else:
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prefix = ""
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try:
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i = decomp_prefix.index(prefix)
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except ValueError:
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i = len(decomp_prefix)
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decomp_prefix.append(prefix)
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prefix = i
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assert prefix < 256
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# content
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decomp = [prefix + (len(decomp)<<8)] +\
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map(lambda s: int(s, 16), decomp)
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# Collect NFC pairs
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if not prefix and len(decomp) == 3 and \
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char not in unicode.exclusions and \
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unicode.table[decomp[1]][3] == "0":
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p, l, r = decomp
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comp_first[l] = 1
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comp_last[r] = 1
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comp_pairs.append((l,r,char))
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try:
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i = decomp_data.index(decomp)
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except ValueError:
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i = len(decomp_data)
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decomp_data.extend(decomp)
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decomp_size = decomp_size + len(decomp) * 2
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else:
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i = 0
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decomp_index[char] = i
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f = l = 0
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comp_first_ranges = []
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comp_last_ranges = []
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prev_f = prev_l = None
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for i in unicode.chars:
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if comp_first[i] is not None:
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comp_first[i] = f
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f += 1
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if prev_f is None:
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prev_f = (i,i)
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elif prev_f[1]+1 == i:
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prev_f = prev_f[0],i
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else:
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comp_first_ranges.append(prev_f)
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prev_f = (i,i)
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if comp_last[i] is not None:
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comp_last[i] = l
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l += 1
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if prev_l is None:
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prev_l = (i,i)
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elif prev_l[1]+1 == i:
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prev_l = prev_l[0],i
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else:
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comp_last_ranges.append(prev_l)
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prev_l = (i,i)
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comp_first_ranges.append(prev_f)
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comp_last_ranges.append(prev_l)
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total_first = f
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total_last = l
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comp_data = [0]*(total_first*total_last)
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for f,l,char in comp_pairs:
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f = comp_first[f]
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l = comp_last[l]
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comp_data[f*total_last+l] = char
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print len(table), "unique properties"
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print len(decomp_prefix), "unique decomposition prefixes"
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print len(decomp_data), "unique decomposition entries:",
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print decomp_size, "bytes"
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print total_first, "first characters in NFC"
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print total_last, "last characters in NFC"
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print len(comp_pairs), "NFC pairs"
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print "--- Writing", FILE, "..."
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fp = open(FILE, "w")
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print >>fp, "/* this file was generated by %s %s */" % (SCRIPT, VERSION)
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print >>fp
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print >>fp, '#define UNIDATA_VERSION "%s"' % UNIDATA_VERSION
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print >>fp, "/* a list of unique database records */"
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print >>fp, \
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"const _PyUnicode_DatabaseRecord _PyUnicode_Database_Records[] = {"
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for item in table:
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print >>fp, " {%d, %d, %d, %d, %d}," % item
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print >>fp, "};"
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print >>fp
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print >>fp, "/* Reindexing of NFC first characters. */"
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print >>fp, "#define TOTAL_FIRST",total_first
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print >>fp, "#define TOTAL_LAST",total_last
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print >>fp, "struct reindex{int start;short count,index;};"
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print >>fp, "struct reindex nfc_first[] = {"
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for start,end in comp_first_ranges:
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print >>fp," { %d, %d, %d}," % (start,end-start,comp_first[start])
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print >>fp," {0,0,0}"
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print >>fp,"};\n"
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print >>fp, "struct reindex nfc_last[] = {"
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for start,end in comp_last_ranges:
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print >>fp," { %d, %d, %d}," % (start,end-start,comp_last[start])
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print >>fp," {0,0,0}"
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print >>fp,"};\n"
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# FIXME: <fl> the following tables could be made static, and
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# the support code moved into unicodedatabase.c
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print >>fp, "/* string literals */"
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print >>fp, "const char *_PyUnicode_CategoryNames[] = {"
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for name in CATEGORY_NAMES:
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print >>fp, " \"%s\"," % name
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print >>fp, " NULL"
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print >>fp, "};"
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print >>fp, "const char *_PyUnicode_BidirectionalNames[] = {"
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for name in BIDIRECTIONAL_NAMES:
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print >>fp, " \"%s\"," % name
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print >>fp, " NULL"
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print >>fp, "};"
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print >>fp, "const char *_PyUnicode_EastAsianWidthNames[] = {"
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for name in EASTASIANWIDTH_NAMES:
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print >>fp, " \"%s\"," % name
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print >>fp, " NULL"
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print >>fp, "};"
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print >>fp, "static const char *decomp_prefix[] = {"
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for name in decomp_prefix:
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print >>fp, " \"%s\"," % name
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print >>fp, " NULL"
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print >>fp, "};"
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# split record index table
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index1, index2, shift = splitbins(index, trace)
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print >>fp, "/* index tables for the database records */"
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print >>fp, "#define SHIFT", shift
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Array("index1", index1).dump(fp, trace)
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Array("index2", index2).dump(fp, trace)
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# split decomposition index table
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index1, index2, shift = splitbins(decomp_index, trace)
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print >>fp, "/* decomposition data */"
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Array("decomp_data", decomp_data).dump(fp, trace)
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print >>fp, "/* index tables for the decomposition data */"
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print >>fp, "#define DECOMP_SHIFT", shift
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Array("decomp_index1", index1).dump(fp, trace)
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Array("decomp_index2", index2).dump(fp, trace)
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index, index2, shift = splitbins(comp_data, trace)
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print >>fp, "/* NFC pairs */"
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print >>fp, "#define COMP_SHIFT", shift
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Array("comp_index", index).dump(fp, trace)
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Array("comp_data", index2).dump(fp, trace)
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# Generate delta tables for old versions
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for version, table, normalization in unicode.changed:
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cversion = version.replace(".","_")
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records = [table[0]]
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cache = {table[0]:0}
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index = [0] * len(table)
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for i, record in enumerate(table):
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try:
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index[i] = cache[record]
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except KeyError:
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index[i] = cache[record] = len(records)
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records.append(record)
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index1, index2, shift = splitbins(index, trace)
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print >>fp, "static const change_record change_records_%s[] = {" % cversion
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for record in records:
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print >>fp, "\t{ %s }," % ", ".join(map(str,record))
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print >>fp, "};"
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Array("changes_%s_index" % cversion, index1).dump(fp, trace)
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Array("changes_%s_data" % cversion, index2).dump(fp, trace)
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print >>fp, "static const change_record* get_change_%s(Py_UCS4 n)" % cversion
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print >>fp, "{"
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print >>fp, "\tint index;"
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print >>fp, "\tif (n >= 0x110000) index = 0;"
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print >>fp, "\telse {"
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print >>fp, "\t\tindex = changes_%s_index[n>>%d];" % (cversion, shift)
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print >>fp, "\t\tindex = changes_%s_data[(index<<%d)+(n & %d)];" % \
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(cversion, shift, ((1<<shift)-1))
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print >>fp, "\t}"
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print >>fp, "\treturn change_records_%s+index;" % cversion
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print >>fp, "}\n"
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print >>fp, "static Py_UCS4 normalization_%s(Py_UCS4 n)" % cversion
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print >>fp, "{"
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print >>fp, "\tswitch(n) {"
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for k, v in normalization:
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print >>fp, "\tcase %s: return 0x%s;" % (hex(k), v)
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print >>fp, "\tdefault: return 0;"
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print >>fp, "\t}\n}\n"
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fp.close()
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# --------------------------------------------------------------------
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# unicode character type tables
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def makeunicodetype(unicode, trace):
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FILE = "Objects/unicodetype_db.h"
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print "--- Preparing", FILE, "..."
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# extract unicode types
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dummy = (0, 0, 0, 0, 0, 0)
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table = [dummy]
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cache = {0: dummy}
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index = [0] * len(unicode.chars)
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for char in unicode.chars:
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record = unicode.table[char]
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if record:
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# extract database properties
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category = record[2]
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bidirectional = record[4]
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flags = 0
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if category in ["Lm", "Lt", "Lu", "Ll", "Lo"]:
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flags |= ALPHA_MASK
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if category == "Ll":
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flags |= LOWER_MASK
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if category == "Zl" or bidirectional == "B":
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flags |= LINEBREAK_MASK
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if category == "Zs" or bidirectional in ("WS", "B", "S"):
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flags |= SPACE_MASK
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if category == "Lt":
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flags |= TITLE_MASK
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if category == "Lu":
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flags |= UPPER_MASK
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# use delta predictor for upper/lower/title
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if record[12]:
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upper = int(record[12], 16) - char
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assert -32768 <= upper <= 32767
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upper = upper & 0xffff
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else:
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upper = 0
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if record[13]:
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lower = int(record[13], 16) - char
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assert -32768 <= lower <= 32767
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lower = lower & 0xffff
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else:
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lower = 0
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if record[14]:
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title = int(record[14], 16) - char
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assert -32768 <= lower <= 32767
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title = title & 0xffff
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else:
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title = 0
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# decimal digit, integer digit
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decimal = 0
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if record[6]:
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flags |= DECIMAL_MASK
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decimal = int(record[6])
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digit = 0
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if record[7]:
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flags |= DIGIT_MASK
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digit = int(record[7])
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item = (
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upper, lower, title, decimal, digit, flags
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)
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# add entry to index and item tables
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i = cache.get(item)
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if i is None:
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cache[item] = i = len(table)
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table.append(item)
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index[char] = i
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print len(table), "unique character type entries"
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print "--- Writing", FILE, "..."
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fp = open(FILE, "w")
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print >>fp, "/* this file was generated by %s %s */" % (SCRIPT, VERSION)
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print >>fp
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print >>fp, "/* a list of unique character type descriptors */"
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print >>fp, "const _PyUnicode_TypeRecord _PyUnicode_TypeRecords[] = {"
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for item in table:
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print >>fp, " {%d, %d, %d, %d, %d, %d}," % item
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print >>fp, "};"
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print >>fp
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# split decomposition index table
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index1, index2, shift = splitbins(index, trace)
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print >>fp, "/* type indexes */"
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print >>fp, "#define SHIFT", shift
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Array("index1", index1).dump(fp, trace)
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Array("index2", index2).dump(fp, trace)
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fp.close()
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# --------------------------------------------------------------------
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# unicode name database
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def makeunicodename(unicode, trace):
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FILE = "Modules/unicodename_db.h"
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print "--- Preparing", FILE, "..."
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# collect names
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names = [None] * len(unicode.chars)
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for char in unicode.chars:
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record = unicode.table[char]
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if record:
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name = record[1].strip()
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if name and name[0] != "<":
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names[char] = name + chr(0)
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print len(filter(lambda n: n is not None, names)), "distinct names"
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# collect unique words from names (note that we differ between
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# words inside a sentence, and words ending a sentence. the
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# latter includes the trailing null byte.
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words = {}
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n = b = 0
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for char in unicode.chars:
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name = names[char]
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if name:
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w = name.split()
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b = b + len(name)
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n = n + len(w)
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for w in w:
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l = words.get(w)
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if l:
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l.append(None)
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else:
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words[w] = [len(words)]
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print n, "words in text;", b, "bytes"
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wordlist = words.items()
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|
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# sort on falling frequency, then by name
|
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def cmpwords((aword, alist),(bword, blist)):
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r = -cmp(len(alist),len(blist))
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if r:
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return r
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return cmp(aword, bword)
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|
wordlist.sort(cmpwords)
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|
|
# figure out how many phrasebook escapes we need
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|
escapes = 0
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|
while escapes * 256 < len(wordlist):
|
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escapes = escapes + 1
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|
print escapes, "escapes"
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|
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short = 256 - escapes
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|
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assert short > 0
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|
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print short, "short indexes in lexicon"
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|
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# statistics
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n = 0
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for i in range(short):
|
|
n = n + len(wordlist[i][1])
|
|
print n, "short indexes in phrasebook"
|
|
|
|
# pick the most commonly used words, and sort the rest on falling
|
|
# length (to maximize overlap)
|
|
|
|
wordlist, wordtail = wordlist[:short], wordlist[short:]
|
|
wordtail.sort(lambda a, b: len(b[0])-len(a[0]))
|
|
wordlist.extend(wordtail)
|
|
|
|
# generate lexicon from words
|
|
|
|
lexicon_offset = [0]
|
|
lexicon = ""
|
|
words = {}
|
|
|
|
# build a lexicon string
|
|
offset = 0
|
|
for w, x in wordlist:
|
|
# encoding: bit 7 indicates last character in word (chr(128)
|
|
# indicates the last character in an entire string)
|
|
ww = w[:-1] + chr(ord(w[-1])+128)
|
|
# reuse string tails, when possible
|
|
o = lexicon.find(ww)
|
|
if o < 0:
|
|
o = offset
|
|
lexicon = lexicon + ww
|
|
offset = offset + len(w)
|
|
words[w] = len(lexicon_offset)
|
|
lexicon_offset.append(o)
|
|
|
|
lexicon = map(ord, lexicon)
|
|
|
|
# generate phrasebook from names and lexicon
|
|
phrasebook = [0]
|
|
phrasebook_offset = [0] * len(unicode.chars)
|
|
for char in unicode.chars:
|
|
name = names[char]
|
|
if name:
|
|
w = name.split()
|
|
phrasebook_offset[char] = len(phrasebook)
|
|
for w in w:
|
|
i = words[w]
|
|
if i < short:
|
|
phrasebook.append(i)
|
|
else:
|
|
# store as two bytes
|
|
phrasebook.append((i>>8) + short)
|
|
phrasebook.append(i&255)
|
|
|
|
assert getsize(phrasebook) == 1
|
|
|
|
#
|
|
# unicode name hash table
|
|
|
|
# extract names
|
|
data = []
|
|
for char in unicode.chars:
|
|
record = unicode.table[char]
|
|
if record:
|
|
name = record[1].strip()
|
|
if name and name[0] != "<":
|
|
data.append((name, char))
|
|
|
|
# the magic number 47 was chosen to minimize the number of
|
|
# collisions on the current data set. if you like, change it
|
|
# and see what happens...
|
|
|
|
codehash = Hash("code", data, 47)
|
|
|
|
print "--- Writing", FILE, "..."
|
|
|
|
fp = open(FILE, "w")
|
|
print >>fp, "/* this file was generated by %s %s */" % (SCRIPT, VERSION)
|
|
print >>fp
|
|
print >>fp, "#define NAME_MAXLEN", 256
|
|
print >>fp
|
|
print >>fp, "/* lexicon */"
|
|
Array("lexicon", lexicon).dump(fp, trace)
|
|
Array("lexicon_offset", lexicon_offset).dump(fp, trace)
|
|
|
|
# split decomposition index table
|
|
offset1, offset2, shift = splitbins(phrasebook_offset, trace)
|
|
|
|
print >>fp, "/* code->name phrasebook */"
|
|
print >>fp, "#define phrasebook_shift", shift
|
|
print >>fp, "#define phrasebook_short", short
|
|
|
|
Array("phrasebook", phrasebook).dump(fp, trace)
|
|
Array("phrasebook_offset1", offset1).dump(fp, trace)
|
|
Array("phrasebook_offset2", offset2).dump(fp, trace)
|
|
|
|
print >>fp, "/* name->code dictionary */"
|
|
codehash.dump(fp, trace)
|
|
|
|
fp.close()
|
|
|
|
|
|
def merge_old_version(version, new, old):
|
|
# Changes to exclusion file not implemented yet
|
|
if old.exclusions != new.exclusions:
|
|
raise NotImplementedError, "exclusions differ"
|
|
|
|
# In these change records, 0xFF means "no change"
|
|
bidir_changes = [0xFF]*0x110000
|
|
category_changes = [0xFF]*0x110000
|
|
decimal_changes = [0xFF]*0x110000
|
|
# In numeric data, 0 means "no change",
|
|
# -1 means "did not have a numeric value
|
|
numeric_changes = [0] * 0x110000
|
|
# normalization_changes is a list of key-value pairs
|
|
normalization_changes = []
|
|
for i in range(0x110000):
|
|
if new.table[i] is None:
|
|
# Characters unassigned in the new version ought to
|
|
# be unassigned in the old one
|
|
assert old.table[i] is None
|
|
continue
|
|
# check characters unassigned in the old version
|
|
if old.table[i] is None:
|
|
# category 0 is "unassigned"
|
|
category_changes[i] = 0
|
|
continue
|
|
# check characters that differ
|
|
if old.table[i] != new.table[i]:
|
|
for k in range(len(old.table[i])):
|
|
if old.table[i][k] != new.table[i][k]:
|
|
value = old.table[i][k]
|
|
if k == 2:
|
|
#print "CATEGORY",hex(i), old.table[i][k], new.table[i][k]
|
|
category_changes[i] = CATEGORY_NAMES.index(value)
|
|
elif k == 4:
|
|
#print "BIDIR",hex(i), old.table[i][k], new.table[i][k]
|
|
bidir_changes[i] = BIDIRECTIONAL_NAMES.index(value)
|
|
elif k == 5:
|
|
#print "DECOMP",hex(i), old.table[i][k], new.table[i][k]
|
|
# We assume that all normalization changes are in 1:1 mappings
|
|
assert " " not in value
|
|
normalization_changes.append((i, value))
|
|
elif k == 6:
|
|
#print "DECIMAL",hex(i), old.table[i][k], new.table[i][k]
|
|
# we only support changes where the old value is a single digit
|
|
assert value in "0123456789"
|
|
decimal_changes[i] = int(value)
|
|
elif k == 8:
|
|
# print "NUMERIC",hex(i), `old.table[i][k]`, new.table[i][k]
|
|
# Since 0 encodes "no change", the old value is better not 0
|
|
assert value != "0" and value != "-1"
|
|
if not value:
|
|
numeric_changes[i] = -1
|
|
else:
|
|
assert re.match("^[0-9]+$", value)
|
|
numeric_changes[i] = int(value)
|
|
elif k == 11:
|
|
# change to ISO comment, ignore
|
|
pass
|
|
elif k == 12:
|
|
# change to simple uppercase mapping; ignore
|
|
pass
|
|
elif k == 13:
|
|
# change to simple lowercase mapping; ignore
|
|
pass
|
|
elif k == 14:
|
|
# change to simple titlecase mapping; ignore
|
|
pass
|
|
else:
|
|
class Difference(Exception):pass
|
|
raise Difference, (hex(i), k, old.table[i], new.table[i])
|
|
new.changed.append((version, zip(bidir_changes, category_changes,
|
|
decimal_changes, numeric_changes),
|
|
normalization_changes))
|
|
|
|
|
|
# --------------------------------------------------------------------
|
|
# 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 sys
|
|
|
|
class UnicodeData:
|
|
|
|
def __init__(self, filename, exclusions, eastasianwidth, expand=1):
|
|
self.changed = []
|
|
file = open(filename)
|
|
table = [None] * 0x110000
|
|
while 1:
|
|
s = file.readline()
|
|
if not s:
|
|
break
|
|
s = s.strip().split(";")
|
|
char = int(s[0], 16)
|
|
table[char] = s
|
|
|
|
# expand first-last ranges
|
|
if expand:
|
|
field = None
|
|
for i in range(0, 0x110000):
|
|
s = table[i]
|
|
if s:
|
|
if s[1][-6:] == "First>":
|
|
s[1] = ""
|
|
field = s
|
|
elif s[1][-5:] == "Last>":
|
|
s[1] = ""
|
|
field = None
|
|
elif field:
|
|
f2 = field[:]
|
|
f2[0] = "%X" % i
|
|
table[i] = f2
|
|
|
|
# public attributes
|
|
self.filename = filename
|
|
self.table = table
|
|
self.chars = range(0x110000) # unicode 3.2
|
|
|
|
file = open(exclusions)
|
|
self.exclusions = {}
|
|
for s in file:
|
|
s = s.strip()
|
|
if not s:
|
|
continue
|
|
if s[0] == '#':
|
|
continue
|
|
char = int(s.split()[0],16)
|
|
self.exclusions[char] = 1
|
|
|
|
widths = [None] * 0x110000
|
|
for s in open(eastasianwidth):
|
|
s = s.strip()
|
|
if not s:
|
|
continue
|
|
if s[0] == '#':
|
|
continue
|
|
s = s.split()[0].split(';')
|
|
if '..' in s[0]:
|
|
first, last = [int(c, 16) for c in s[0].split('..')]
|
|
chars = range(first, last+1)
|
|
else:
|
|
chars = [int(s[0], 16)]
|
|
for char in chars:
|
|
widths[char] = s[1]
|
|
for i in range(0, 0x110000):
|
|
if table[i] is not None:
|
|
table[i].append(widths[i])
|
|
|
|
def uselatin1(self):
|
|
# restrict character range to ISO Latin 1
|
|
self.chars = range(256)
|
|
|
|
# hash table tools
|
|
|
|
# this is a straight-forward reimplementation of Python's built-in
|
|
# dictionary type, using a static data structure, and a custom string
|
|
# hash algorithm.
|
|
|
|
def myhash(s, magic):
|
|
h = 0
|
|
for c in map(ord, s.upper()):
|
|
h = (h * magic) + c
|
|
ix = h & 0xff000000
|
|
if ix:
|
|
h = (h ^ ((ix>>24) & 0xff)) & 0x00ffffff
|
|
return h
|
|
|
|
SIZES = [
|
|
(4,3), (8,3), (16,3), (32,5), (64,3), (128,3), (256,29), (512,17),
|
|
(1024,9), (2048,5), (4096,83), (8192,27), (16384,43), (32768,3),
|
|
(65536,45), (131072,9), (262144,39), (524288,39), (1048576,9),
|
|
(2097152,5), (4194304,3), (8388608,33), (16777216,27)
|
|
]
|
|
|
|
class Hash:
|
|
def __init__(self, name, data, magic):
|
|
# turn a (key, value) list into a static hash table structure
|
|
|
|
# determine table size
|
|
for size, poly in SIZES:
|
|
if size > len(data):
|
|
poly = size + poly
|
|
break
|
|
else:
|
|
raise AssertionError, "ran out of polynominals"
|
|
|
|
print size, "slots in hash table"
|
|
|
|
table = [None] * size
|
|
|
|
mask = size-1
|
|
|
|
n = 0
|
|
|
|
hash = myhash
|
|
|
|
# initialize hash table
|
|
for key, value in data:
|
|
h = hash(key, magic)
|
|
i = (~h) & mask
|
|
v = table[i]
|
|
if v is None:
|
|
table[i] = value
|
|
continue
|
|
incr = (h ^ (h >> 3)) & mask;
|
|
if not incr:
|
|
incr = mask
|
|
while 1:
|
|
n = n + 1
|
|
i = (i + incr) & mask
|
|
v = table[i]
|
|
if v is None:
|
|
table[i] = value
|
|
break
|
|
incr = incr << 1
|
|
if incr > mask:
|
|
incr = incr ^ poly
|
|
|
|
print n, "collisions"
|
|
self.collisions = n
|
|
|
|
for i in range(len(table)):
|
|
if table[i] is None:
|
|
table[i] = 0
|
|
|
|
self.data = Array(name + "_hash", table)
|
|
self.magic = magic
|
|
self.name = name
|
|
self.size = size
|
|
self.poly = poly
|
|
|
|
def dump(self, file, trace):
|
|
# write data to file, as a C array
|
|
self.data.dump(file, trace)
|
|
file.write("#define %s_magic %d\n" % (self.name, self.magic))
|
|
file.write("#define %s_size %d\n" % (self.name, self.size))
|
|
file.write("#define %s_poly %d\n" % (self.name, self.poly))
|
|
|
|
# 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, trace=0):
|
|
# write data to file, as a C array
|
|
size = getsize(self.data)
|
|
if trace:
|
|
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 s.strip():
|
|
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 non-zero (default zero), progress info
|
|
is printed to sys.stderr. The higher the value, the more info
|
|
you'll get.
|
|
"""
|
|
|
|
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 > 1:
|
|
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 range(len(t)):
|
|
assert t[i] == t2[(t1[i >> shift] << shift) + (i & mask)]
|
|
return best
|
|
|
|
if __name__ == "__main__":
|
|
maketables(1)
|