5ae638c78e
The script was originally used to create the initial set of codecs (and these were (c) CNRI). While the script itself still is (c) CNRI, the output certainly isn't anymore.
301 lines
7.6 KiB
Python
301 lines
7.6 KiB
Python
""" Unicode Mapping Parser and Codec Generator.
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This script parses Unicode mapping files as available from the Unicode
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site (ftp://ftp.unicode.org/Public/MAPPINGS/) and creates Python codec
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modules from them. The codecs use the standard character mapping codec
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to actually apply the mapping.
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Synopsis: gencodec.py dir codec_prefix
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All files in dir are scanned and those producing non-empty mappings
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will be written to <codec_prefix><mapname>.py with <mapname> being the
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first part of the map's filename ('a' in a.b.c.txt) converted to
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lowercase with hyphens replaced by underscores.
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The tool also writes marshalled versions of the mapping tables to the
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same location (with .mapping extension).
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Written by Marc-Andre Lemburg (mal@lemburg.com).
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(c) Copyright CNRI, All Rights Reserved. NO WARRANTY.
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(c) Copyright Guido van Rossum, 2000.
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"""#"
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import re,os,time,marshal
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# Create numeric tables or character based ones ?
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numeric = 1
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mapRE = re.compile('((?:0x[0-9a-fA-F]+\+?)+)'
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'\s+'
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'((?:(?:0x[0-9a-fA-Z]+|<[A-Za-z]+>)\+?)*)'
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'\s*'
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'(#.+)?')
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def parsecodes(codes,
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len=len, filter=filter,range=range):
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""" Converts code combinations to either a single code integer
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or a tuple of integers.
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meta-codes (in angular brackets, e.g. <LR> and <RL>) are
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ignored.
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Empty codes or illegal ones are returned as None.
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"""
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if not codes:
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return None
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l = codes.split('+')
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if len(l) == 1:
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return int(l[0],16)
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for i in range(len(l)):
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try:
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l[i] = int(l[i],16)
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except ValueError:
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l[i] = None
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l = filter(lambda x: x is not None, l)
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if len(l) == 1:
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return l[0]
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else:
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return tuple(l)
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def readmap(filename):
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f = open(filename,'r')
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lines = f.readlines()
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f.close()
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enc2uni = {}
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identity = []
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unmapped = range(256)
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for i in range(256):
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unmapped[i] = i
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for line in lines:
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line = line.strip()
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if not line or line[0] == '#':
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continue
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m = mapRE.match(line)
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if not m:
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#print '* not matched: %s' % repr(line)
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continue
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enc,uni,comment = m.groups()
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enc = parsecodes(enc)
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uni = parsecodes(uni)
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if not comment:
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comment = ''
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else:
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comment = comment[1:]
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if enc < 256:
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unmapped.remove(enc)
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if enc == uni:
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identity.append(enc)
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else:
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enc2uni[enc] = (uni,comment)
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else:
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enc2uni[enc] = (uni,comment)
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# If there are more identity-mapped entries than unmapped entries,
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# it pays to generate an identity dictionary first, and add explicit
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# mappings to None for the rest
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if len(identity)>=len(unmapped):
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for enc in unmapped:
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enc2uni[enc] = (None, "")
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enc2uni['IDENTITY'] = 256
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return enc2uni
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def hexrepr(t):
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if t is None:
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return 'None'
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try:
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len(t)
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except:
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return '0x%04x' % t
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return '(' + ', '.join(map(lambda t: '0x%04x' % t, t)) + ')'
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def unicoderepr(t):
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if t is None:
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return 'None'
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if numeric:
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return hexrepr(t)
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else:
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try:
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len(t)
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except:
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return repr(unichr(t))
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return repr(''.join(map(unichr, t)))
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def keyrepr(t):
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if t is None:
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return 'None'
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if numeric:
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return hexrepr(t)
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else:
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try:
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len(t)
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except:
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if t < 256:
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return repr(chr(t))
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else:
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return repr(unichr(t))
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return repr(''.join(map(chr, t)))
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def codegen(name,map,comments=1):
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""" Returns Python source for the given map.
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Comments are included in the source, if comments is true (default).
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"""
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l = [
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'''\
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""" Python Character Mapping Codec generated from '%s' with gencodec.py.
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"""#"
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import codecs
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### Codec APIs
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class Codec(codecs.Codec):
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def encode(self,input,errors='strict'):
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return codecs.charmap_encode(input,errors,encoding_map)
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def decode(self,input,errors='strict'):
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return codecs.charmap_decode(input,errors,decoding_map)
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class StreamWriter(Codec,codecs.StreamWriter):
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pass
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class StreamReader(Codec,codecs.StreamReader):
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pass
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### encodings module API
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def getregentry():
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return (Codec().encode,Codec().decode,StreamReader,StreamWriter)
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### Decoding Map
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''' % name,
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]
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if map.has_key("IDENTITY"):
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l.append("decoding_map = codecs.make_identity_dict(range(%d))"
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% map["IDENTITY"])
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l.append("decoding_map.update({")
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splits = 1
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del map["IDENTITY"]
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else:
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l.append("decoding_map = {")
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splits = 0
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mappings = map.items()
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mappings.sort()
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append = l.append
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i = 0
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for e,value in mappings:
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try:
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(u,c) = value
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except TypeError:
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u = value
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c = ''
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key = keyrepr(e)
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if c and comments:
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append('\t%s: %s,\t# %s' % (key,unicoderepr(u),c))
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else:
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append('\t%s: %s,' % (key,unicoderepr(u)))
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i += 1
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if i == 4096:
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# Split the definition into parts to that the Python
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# parser doesn't dump core
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if splits == 0:
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append('}')
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else:
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append('})')
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append('decoding_map.update({')
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i = 0
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splits = splits + 1
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if splits == 0:
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append('}')
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else:
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append('})')
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append('''
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### Encoding Map
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encoding_map = codecs.make_encoding_map(decoding_map)
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''')
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return '\n'.join(l)
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def pymap(name,map,pyfile,comments=1):
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code = codegen(name,map,comments)
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f = open(pyfile,'w')
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f.write(code)
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f.close()
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def marshalmap(name,map,marshalfile):
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d = {}
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for e,(u,c) in map.items():
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d[e] = (u,c)
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f = open(marshalfile,'wb')
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marshal.dump(d,f)
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f.close()
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def convertdir(dir,prefix='',comments=1):
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mapnames = os.listdir(dir)
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for mapname in mapnames:
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name = os.path.split(mapname)[1]
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name = name.replace('-','_')
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name = name.split('.')[0]
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name = name.lower()
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codefile = name + '.py'
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marshalfile = name + '.mapping'
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print 'converting %s to %s and %s' % (mapname,
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prefix + codefile,
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prefix + marshalfile)
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try:
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map = readmap(os.path.join(dir,mapname))
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if not map:
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print '* map is empty; skipping'
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else:
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pymap(mapname, map, prefix + codefile,comments)
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marshalmap(mapname, map, prefix + marshalfile)
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except ValueError:
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print '* conversion failed'
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def rewritepythondir(dir,prefix='',comments=1):
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mapnames = os.listdir(dir)
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for mapname in mapnames:
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if not mapname.endswith('.mapping'):
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continue
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codefile = mapname[:-len('.mapping')] + '.py'
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print 'converting %s to %s' % (mapname,
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prefix + codefile)
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try:
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map = marshal.load(open(os.path.join(dir,mapname),
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'rb'))
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if not map:
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print '* map is empty; skipping'
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else:
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pymap(mapname, map, prefix + codefile,comments)
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except ValueError, why:
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print '* conversion failed: %s' % why
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if __name__ == '__main__':
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import sys
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if 1:
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apply(convertdir,tuple(sys.argv[1:]))
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else:
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apply(rewritepythondir,tuple(sys.argv[1:]))
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