cpython/Tools/unicode/gencodec.py at 3.6 · python-emscripten/cpython · GitHub

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""" Unicode Mapping Parser and Codec Generator.

This script parses Unicode mapping files as available from the Unicode

site (ftp://ftp.unicode.org/Public/MAPPINGS/) and creates Python codec

modules from them. The codecs use the standard character mapping codec

to actually apply the mapping.

Synopsis: gencodec.py dir codec_prefix

All files in dir are scanned and those producing non-empty mappings

will be written to <codec_prefix><mapname>.py with <mapname> being the

first part of the map's filename ('a' in a.b.c.txt) converted to

lowercase with hyphens replaced by underscores.

The tool also writes marshalled versions of the mapping tables to the

same location (with .mapping extension).

Written by Marc-Andre Lemburg (mal@lemburg.com).

Table generation:

Licensed to PSF under a Contributor Agreement.

"""#"

import re, os, marshal, codecs

# Maximum allowed size of charmap tables

MAX_TABLE_SIZE = 8192

# Standard undefined Unicode code point

UNI_UNDEFINED = chr(0xFFFE)

# Placeholder for a missing code point

MISSING_CODE = -1

mapRE = re.compile(r'((?:0x[0-9a-fA-F]+\+?)+)'

r'\s+'

r'((?:(?:0x[0-9a-fA-Z]+|<[A-Za-z]+>)\+?)*)'

r'\s*'

r'(#.+)?')

def parsecodes(codes, len=len, range=range):

""" Converts code combinations to either a single code integer

or a tuple of integers.

meta-codes (in angular brackets, e.g. <LR> and <RL>) are

ignored.

Empty codes or illegal ones are returned as None.

"""

if not codes:

return MISSING_CODE

l = codes.split('+')

if len(l) == 1:

return int(l[0],16)

for i in range(len(l)):

try:

l[i] = int(l[i],16)

except ValueError:

l[i] = MISSING_CODE

l = [x for x in l if x != MISSING_CODE]

if len(l) == 1:

return l[0]

else:

return tuple(l)

def readmap(filename):

f = open(filename,'r')

lines = f.readlines()

f.close()

enc2uni = {}

identity = []

unmapped = list(range(256))

# UTC mapping tables per convention don't include the identity

# mappings for code points 0x00 - 0x1F and 0x7F, unless these are

# explicitly mapped to different characters or undefined

for i in list(range(32)) + [127]:

identity.append(i)

unmapped.remove(i)

enc2uni[i] = (i, 'CONTROL CHARACTER')

for line in lines:

line = line.strip()

if not line or line[0] == '#':

continue

m = mapRE.match(line)

if not m:

#print '* not matched: %s' % repr(line)

continue

enc,uni,comment = m.groups()

enc = parsecodes(enc)

uni = parsecodes(uni)

if comment is None:

comment = ''

else:

comment = comment[1:].strip()

if not isinstance(enc, tuple) and enc < 256:

if enc in unmapped:

unmapped.remove(enc)

if enc == uni:

identity.append(enc)

enc2uni[enc] = (uni,comment)

else:

enc2uni[enc] = (uni,comment)

# If there are more identity-mapped entries than unmapped entries,

# it pays to generate an identity dictionary first, and add explicit

# mappings to None for the rest

if len(identity) >= len(unmapped):

for enc in unmapped:

enc2uni[enc] = (MISSING_CODE, "")

enc2uni['IDENTITY'] = 256

return enc2uni

def hexrepr(t, precision=4):

if t is None:

return 'None'

try:

len(t)

except TypeError:

return '0x%0*X' % (precision, t)

try:

return '(' + ', '.join(['0x%0*X' % (precision, item)

for item in t]) + ')'

except TypeError as why:

print('* failed to convert %r: %s' % (t, why))

raise

def python_mapdef_code(varname, map, comments=1, precisions=(2, 4)):

l = []

append = l.append

if "IDENTITY" in map:

append("%s = codecs.make_identity_dict(range(%d))" %

(varname, map["IDENTITY"]))

append("%s.update({" % varname)

splits = 1

del map["IDENTITY"]

identity = 1

else:

append("%s = {" % varname)

splits = 0

identity = 0

mappings = sorted(map.items())

i = 0

key_precision, value_precision = precisions

for mapkey, mapvalue in mappings:

mapcomment = ''

if isinstance(mapkey, tuple):

(mapkey, mapcomment) = mapkey

if isinstance(mapvalue, tuple):

(mapvalue, mapcomment) = mapvalue

if mapkey is None:

continue

if (identity and

mapkey == mapvalue and

mapkey < 256):

# No need to include identity mappings, since these

# are already set for the first 256 code points.

continue

key = hexrepr(mapkey, key_precision)

value = hexrepr(mapvalue, value_precision)

if mapcomment and comments:

append(' %s: %s,\t# %s' % (key, value, mapcomment))

else:

append(' %s: %s,' % (key, value))

i += 1

if i == 4096:

# Split the definition into parts to that the Python

# parser doesn't dump core

if splits == 0:

append('}')

else:

append('})')

append('%s.update({' % varname)

i = 0

splits = splits + 1

if splits == 0:

append('}')

else:

append('})')

return l

def python_tabledef_code(varname, map, comments=1, key_precision=2):

l = []

append = l.append

append('%s = (' % varname)

# Analyze map and create table dict

mappings = sorted(map.items())

table = {}

maxkey = 255

if 'IDENTITY' in map:

for key in range(256):

table[key] = (key, '')

del map['IDENTITY']

for mapkey, mapvalue in mappings:

mapcomment = ''

if isinstance(mapkey, tuple):

(mapkey, mapcomment) = mapkey

if isinstance(mapvalue, tuple):

(mapvalue, mapcomment) = mapvalue

if mapkey == MISSING_CODE:

continue

table[mapkey] = (mapvalue, mapcomment)

if mapkey > maxkey:

maxkey = mapkey

if maxkey > MAX_TABLE_SIZE:

# Table too large

return None

# Create table code

maxchar = 0

for key in range(maxkey + 1):

if key not in table:

mapvalue = MISSING_CODE

mapcomment = 'UNDEFINED'

else:

mapvalue, mapcomment = table[key]

if mapvalue == MISSING_CODE:

mapchar = UNI_UNDEFINED

else:

if isinstance(mapvalue, tuple):

# 1-n mappings not supported

return None

else:

mapchar = chr(mapvalue)

maxchar = max(maxchar, ord(mapchar))

if mapcomment and comments:

append(' %a \t# %s -> %s' % (mapchar,

hexrepr(key, key_precision),

mapcomment))

else:

append(' %a' % mapchar)

if maxchar < 256:

append(' %a \t## Widen to UCS2 for optimization' % UNI_UNDEFINED)

append(')')

return l

def codegen(name, map, encodingname, comments=1):

""" Returns Python source for the given map.

Comments are included in the source, if comments is true (default).

"""

# Generate code

decoding_map_code = python_mapdef_code(

'decoding_map',

map,

comments=comments)

decoding_table_code = python_tabledef_code(

'decoding_table',

map,

comments=comments)

encoding_map_code = python_mapdef_code(

'encoding_map',

codecs.make_encoding_map(map),

comments=comments,

precisions=(4, 2))

if decoding_table_code:

suffix = 'table'

else:

suffix = 'map'

l = [

'''\

""" Python Character Mapping Codec %s generated from '%s' with gencodec.py.

"""#"

import codecs

### Codec APIs

class Codec(codecs.Codec):

def encode(self, input, errors='strict'):

return codecs.charmap_encode(input, errors, encoding_%s)

def decode(self, input, errors='strict'):

return codecs.charmap_decode(input, errors, decoding_%s)

''' % (encodingname, name, suffix, suffix)]

l.append('''\

class IncrementalEncoder(codecs.IncrementalEncoder):

def encode(self, input, final=False):

return codecs.charmap_encode(input, self.errors, encoding_%s)[0]

class IncrementalDecoder(codecs.IncrementalDecoder):

def decode(self, input, final=False):

return codecs.charmap_decode(input, self.errors, decoding_%s)[0]''' %

(suffix, suffix))

l.append('''

class StreamWriter(Codec, codecs.StreamWriter):

pass

class StreamReader(Codec, codecs.StreamReader):

pass

### encodings module API

def getregentry():

return codecs.CodecInfo(

name=%r,

encode=Codec().encode,

decode=Codec().decode,

incrementalencoder=IncrementalEncoder,

incrementaldecoder=IncrementalDecoder,

streamreader=StreamReader,

streamwriter=StreamWriter,

)

''' % encodingname.replace('_', '-'))

# Add decoding table or map (with preference to the table)

if not decoding_table_code:

l.append('''

### Decoding Map

''')

l.extend(decoding_map_code)

else:

l.append('''

### Decoding Table

''')

l.extend(decoding_table_code)

# Add encoding map

if decoding_table_code:

l.append('''

### Encoding table

encoding_table = codecs.charmap_build(decoding_table)

''')

else:

l.append('''

### Encoding Map

''')

l.extend(encoding_map_code)

# Final new-line

l.append('')

return '\n'.join(l).expandtabs()

def pymap(name,map,pyfile,encodingname,comments=1):

code = codegen(name,map,encodingname,comments)

f = open(pyfile,'w')

f.write(code)

f.close()

def marshalmap(name,map,marshalfile):

d = {}

for e,(u,c) in map.items():

d[e] = (u,c)

f = open(marshalfile,'wb')

marshal.dump(d,f)

f.close()

def convertdir(dir, dirprefix='', nameprefix='', comments=1):

mapnames = os.listdir(dir)

for mapname in mapnames:

mappathname = os.path.join(dir, mapname)

if not os.path.isfile(mappathname):

continue

name = os.path.split(mapname)[1]

name = name.replace('-','_')

name = name.split('.')[0]

name = name.lower()

name = nameprefix + name

codefile = name + '.py'

marshalfile = name + '.mapping'

print('converting %s to %s and %s' % (mapname,

dirprefix + codefile,

dirprefix + marshalfile))

try:

map = readmap(os.path.join(dir,mapname))

if not map:

print('* map is empty; skipping')

else:

pymap(mappathname, map, dirprefix + codefile,name,comments)

marshalmap(mappathname, map, dirprefix + marshalfile)

except ValueError as why:

print('* conversion failed: %s' % why)

raise

def rewritepythondir(dir, dirprefix='', comments=1):

mapnames = os.listdir(dir)

for mapname in mapnames:

if not mapname.endswith('.mapping'):

continue

name = mapname[:-len('.mapping')]

codefile = name + '.py'

print('converting %s to %s' % (mapname,

dirprefix + codefile))

try:

map = marshal.load(open(os.path.join(dir,mapname),

'rb'))

if not map:

print('* map is empty; skipping')

else:

pymap(mapname, map, dirprefix + codefile,name,comments)

except ValueError as why:

print('* conversion failed: %s' % why)

if __name__ == '__main__':

import sys

if 1:

convertdir(*sys.argv[1:])

else:

rewritepythondir(*sys.argv[1:])

cpython/Tools/unicode/gencodec.py at 3.6 · python-emscripten/cpython · GitHub

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