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317 lines
8 KiB
Python
317 lines
8 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 string,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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split=string.split,atoi=string.atoi,len=len,
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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 = split(codes,'+')
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if len(l) == 1:
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return atoi(l[0],16)
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for i in range(len(l)):
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try:
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l[i] = atoi(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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strip=string.strip):
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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 = strip(line)
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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, add 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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join=string.join):
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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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join=string.join):
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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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join=string.join):
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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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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 2000 Guido van Rossum.
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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 = {}
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for k,v in decoding_map.items():
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encoding_map[v] = k
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''')
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return string.join(l,'\n')
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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 = string.replace(name,'-','_')
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name = string.split(name, '.')[0]
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name = string.lower(name)
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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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