cpython/Tools/unicode/mkstringprep.py at v3.6.15 · python/cpython · GitHub

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import re, sys

from unicodedata import ucd_3_2_0 as unicodedata

if sys.maxunicode == 65535:

raise RuntimeError("need UCS-4 Python")

def gen_category(cats):

for i in range(0, 0x110000):

if unicodedata.category(chr(i)) in cats:

yield(i)

def gen_bidirectional(cats):

for i in range(0, 0x110000):

if unicodedata.bidirectional(chr(i)) in cats:

yield(i)

def compact_set(l):

single = []

tuple = []

prev = None

span = 0

for e in l:

if prev is None:

prev = e

span = 0

continue

if prev+span+1 != e:

if span > 2:

tuple.append((prev,prev+span+1))

else:

for i in range(prev, prev+span+1):

single.append(i)

prev = e

span = 0

else:

span += 1

if span:

tuple.append((prev,prev+span+1))

else:

single.append(prev)

if not single and len(tuple) == 1:

tuple = "range(%d,%d)" % tuple[0]

else:

tuple = " + ".join("list(range(%d,%d))" % t for t in tuple)

if not single:

return "set(%s)" % tuple

if not tuple:

return "set(%r)" % (single,)

return "set(%r + %s)" % (single, tuple)

############## Read the tables in the RFC #######################

with open("rfc3454.txt") as f:

data = f.readlines()

tables = []

curname = None

for l in data:

l = l.strip()

if not l:

continue

# Skip RFC page breaks

if l.startswith(("Hoffman & Blanchet", "RFC 3454")):

continue

# Find start/end lines

m = re.match("----- (Start|End) Table ([A-Z](.[0-9])+) -----", l)

if m:

if m.group(1) == "Start":

if curname:

raise RuntimeError("Double Start", (curname, l))

curname = m.group(2)

table = {}

tables.append((curname, table))

continue

else:

if not curname:

raise RuntimeError("End without start", l)

if curname != m.group(2):

raise RuntimeError("Unexpected end", l)

curname = None

continue

if not curname:

continue

# Now we are in a table

fields = l.split(";")

if len(fields) > 1:

# Drop comment field

fields = fields[:-1]

if len(fields) == 1:

fields = fields[0].split("-")

if len(fields) > 1:

# range

try:

start, end = fields

except ValueError:

raise RuntimeError("Unpacking problem", l)

else:

start = end = fields[0]

start = int(start, 16)

end = int(end, 16)

for i in range(start, end+1):

table[i] = i

else:

code, value = fields

value = value.strip()

if value:

value = [int(v, 16) for v in value.split(" ")]

else:

# table B.1

value = None

table[int(code, 16)] = value

########### Generate compact Python versions of the tables #############

print("""# This file is generated by mkstringprep.py. DO NOT EDIT.

\"\"\"Library that exposes various tables found in the StringPrep RFC 3454.

There are two kinds of tables: sets, for which a member test is provided,

and mappings, for which a mapping function is provided.

\"\"\"

from unicodedata import ucd_3_2_0 as unicodedata

""")

print("assert unicodedata.unidata_version == %r" % (unicodedata.unidata_version,))

# A.1 is the table of unassigned characters

# XXX Plane 15 PUA is listed as unassigned in Python.

name, table = tables[0]

del tables[0]

assert name == "A.1"

table = set(table.keys())

Cn = set(gen_category(["Cn"]))

# FDD0..FDEF are process internal codes

Cn -= set(range(0xFDD0, 0xFDF0))

# not a character

Cn -= set(range(0xFFFE, 0x110000, 0x10000))

Cn -= set(range(0xFFFF, 0x110000, 0x10000))

# assert table == Cn

print("""

def in_table_a1(code):

if unicodedata.category(code) != 'Cn': return False

c = ord(code)

if 0xFDD0 <= c < 0xFDF0: return False

return (c & 0xFFFF) not in (0xFFFE, 0xFFFF)

""")

# B.1 cannot easily be derived

name, table = tables[0]

del tables[0]

assert name == "B.1"

table = sorted(table.keys())

print("""

b1_set = """ + compact_set(table) + """

def in_table_b1(code):

return ord(code) in b1_set

""")

# B.2 and B.3 is case folding.

# It takes CaseFolding.txt into account, which is

# not available in the Python database. Since

# B.2 is derived from B.3, we process B.3 first.

# B.3 supposedly *is* CaseFolding-3.2.0.txt.

name, table_b2 = tables[0]

del tables[0]

assert name == "B.2"

name, table_b3 = tables[0]

del tables[0]

assert name == "B.3"

# B.3 is mostly Python's .lower, except for a number

# of special cases, e.g. considering canonical forms.

b3_exceptions = {}

for k,v in table_b2.items():

if list(map(ord, chr(k).lower())) != v:

b3_exceptions[k] = "".join(map(chr,v))

b3 = sorted(b3_exceptions.items())

print("""

b3_exceptions = {""")

for i, kv in enumerate(b3):

print("0x%x:%a," % kv, end=' ')

if i % 4 == 3:

print()

print("}")

print("""

def map_table_b3(code):

r = b3_exceptions.get(ord(code))

if r is not None: return r

return code.lower()

""")

def map_table_b3(code):

r = b3_exceptions.get(ord(code))

if r is not None: return r

return code.lower()

# B.2 is case folding for NFKC. This is the same as B.3,

# except where NormalizeWithKC(Fold(a)) !=

# NormalizeWithKC(Fold(NormalizeWithKC(Fold(a))))

def map_table_b2(a):

al = map_table_b3(a)

b = unicodedata.normalize("NFKC", al)

bl = "".join([map_table_b3(ch) for ch in b])

c = unicodedata.normalize("NFKC", bl)

if b != c:

return c

else:

return al

specials = {}

for k,v in table_b2.items():

if list(map(ord, map_table_b2(chr(k)))) != v:

specials[k] = v

# B.3 should not add any additional special cases

assert specials == {}

print("""

def map_table_b2(a):

al = map_table_b3(a)

b = unicodedata.normalize("NFKC", al)

bl = "".join([map_table_b3(ch) for ch in b])

c = unicodedata.normalize("NFKC", bl)

if b != c:

return c

else:

return al

""")

# C.1.1 is a table with a single character

name, table = tables[0]

del tables[0]

assert name == "C.1.1"

assert table == {0x20:0x20}

print("""

def in_table_c11(code):

return code == " "

""")

# C.1.2 is the rest of all space characters

name, table = tables[0]

del tables[0]

assert name == "C.1.2"

# table = set(table.keys())

# Zs = set(gen_category(["Zs"])) - {0x20}

# assert Zs == table

print("""

def in_table_c12(code):

return unicodedata.category(code) == "Zs" and code != " "

def in_table_c11_c12(code):

return unicodedata.category(code) == "Zs"

""")

# C.2.1 ASCII control characters

name, table_c21 = tables[0]

del tables[0]

assert name == "C.2.1"

Cc = set(gen_category(["Cc"]))

Cc_ascii = Cc & set(range(128))

table_c21 = set(table_c21.keys())

assert Cc_ascii == table_c21

print("""

def in_table_c21(code):

return ord(code) < 128 and unicodedata.category(code) == "Cc"

""")

# C.2.2 Non-ASCII control characters. It also includes

# a number of characters in category Cf.

name, table_c22 = tables[0]

del tables[0]

assert name == "C.2.2"

Cc_nonascii = Cc - Cc_ascii

table_c22 = set(table_c22.keys())

assert len(Cc_nonascii - table_c22) == 0

specials = list(table_c22 - Cc_nonascii)

specials.sort()

print("""c22_specials = """ + compact_set(specials) + """

def in_table_c22(code):

c = ord(code)

if c < 128: return False

if unicodedata.category(code) == "Cc": return True

return c in c22_specials

def in_table_c21_c22(code):

return unicodedata.category(code) == "Cc" or \\

ord(code) in c22_specials

""")

# C.3 Private use

name, table = tables[0]

del tables[0]

assert name == "C.3"

Co = set(gen_category(["Co"]))

assert set(table.keys()) == Co

print("""

def in_table_c3(code):

return unicodedata.category(code) == "Co"

""")

# C.4 Non-character code points, xFFFE, xFFFF

# plus process internal codes

name, table = tables[0]

del tables[0]

assert name == "C.4"

nonchar = set(range(0xFDD0,0xFDF0))

nonchar.update(range(0xFFFE,0x110000,0x10000))

nonchar.update(range(0xFFFF,0x110000,0x10000))

table = set(table.keys())

assert table == nonchar

print("""

def in_table_c4(code):

c = ord(code)

if c < 0xFDD0: return False

if c < 0xFDF0: return True

return (ord(code) & 0xFFFF) in (0xFFFE, 0xFFFF)

""")

# C.5 Surrogate codes

name, table = tables[0]

del tables[0]

assert name == "C.5"

Cs = set(gen_category(["Cs"]))

assert set(table.keys()) == Cs

print("""

def in_table_c5(code):

return unicodedata.category(code) == "Cs"

""")

# C.6 Inappropriate for plain text

name, table = tables[0]

del tables[0]

assert name == "C.6"

table = sorted(table.keys())

print("""

c6_set = """ + compact_set(table) + """

def in_table_c6(code):

return ord(code) in c6_set

""")

# C.7 Inappropriate for canonical representation

name, table = tables[0]

del tables[0]

assert name == "C.7"

table = sorted(table.keys())

print("""

c7_set = """ + compact_set(table) + """

def in_table_c7(code):

return ord(code) in c7_set

""")

# C.8 Change display properties or are deprecated

name, table = tables[0]

del tables[0]

assert name == "C.8"

table = sorted(table.keys())

print("""

c8_set = """ + compact_set(table) + """

def in_table_c8(code):

return ord(code) in c8_set

""")

# C.9 Tagging characters

name, table = tables[0]

del tables[0]

assert name == "C.9"

table = sorted(table.keys())

print("""

c9_set = """ + compact_set(table) + """

def in_table_c9(code):

return ord(code) in c9_set

""")

# D.1 Characters with bidirectional property "R" or "AL"

name, table = tables[0]

del tables[0]

assert name == "D.1"

RandAL = set(gen_bidirectional(["R","AL"]))

assert set(table.keys()) == RandAL

print("""

def in_table_d1(code):

return unicodedata.bidirectional(code) in ("R","AL")

""")

# D.2 Characters with bidirectional property "L"

name, table = tables[0]

del tables[0]

assert name == "D.2"

L = set(gen_bidirectional(["L"]))

assert set(table.keys()) == L

print("""

def in_table_d2(code):

return unicodedata.bidirectional(code) == "L"

""")

cpython/Tools/unicode/mkstringprep.py at v3.6.15 · python/cpython · GitHub

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