1 #!/usr/bin/env python

     2 # vim: set fileencoding=utf-8 :

     3 

     4 """\

     5 YML/YSLT 2 processor version 5.8

     6 Copyleft (c), 2009-2011 Volker Birk  http://fdik.org/yml/

     7 

     8 """

     9 

    10 import sys, os, codecs, locale

    11 import fileinput, unicodedata

    12 from optparse import OptionParser

    13 

    14 try:

    15     from lxml import etree

    16 except:

    17     sys.stderr.write("This program needs lxml, see http://codespeak.net/lxml/\n")

    18     sys.exit(1)

    19 

    20 from yml2 import ymlCStyle, comment, oldSyntax

    21 from pyPEG import parse, u

    22 import backend

    23 

    24 def printInfo(option, opt_str, value, parser):

    25     sys.stdout.write(__doc__)

    26     sys.exit(0)

    27 

    28 class YMLAssert(Exception): pass

    29 

    30 def w(msg):

    31     if isinstance(msg, BaseException):

    32         try:

    33             msg = str(msg) + "\n"

    34         except:

    35             msg = u(msg) + u"\n"

    36     if type(msg) is unicode:

    37         msg = codecs.encode(msg, sys.stderr.encoding)

    38     sys.stderr.write(msg)

    39 

    40 optParser = OptionParser()

    41 optParser.add_option("-C", "--old-syntax", action="store_true", dest="old_syntax",

    42         help="syntax of YML 2 version 1.x (compatibility mode)", default=False)

    43 optParser.add_option("-D", "--emit-linenumbers", action="store_true", dest="emitlinenumbers",

    44         help="emit line numbers into the resulting XML for debugging purposes", default=False)

    45 optParser.add_option("--debug", action="store_true", dest="trace",

    46         help="switch on tracing to stderr", default=False)

    47 optParser.add_option("-d", "--paramdict", dest="params", metavar="PARAMS",

    48         help="call X/YSLT script with dictionary PARAMS as parameters")

    49 optParser.add_option("-e", "--xpath", dest="xpath", metavar="XPATH",

    50         help="execute XPath expression XPATH and print result")

    51 optParser.add_option("-E", "--encoding", dest="encoding", metavar="ENCODING", default=locale.getdefaultlocale()[1],

    52         help="encoding of input files (default to locale)")

    53 optParser.add_option("-I", "--include", dest="includePathText", metavar="INCLUDE_PATH",

    54         help="precede YML_PATH by a colon separated INCLUDE_PATH to search for include files")

    55 optParser.add_option("-m", "--omit-empty-parm-tags", action="store_true", dest="omitemptyparm",

    56         help="does nothing (only there for compatibility reasons)", default=False)

    57 optParser.add_option("-M", "--empty-input-document", action="store_true", dest="emptyinput",

    58         help="use an empty input document", default=False)

    59 optParser.add_option("-n", "--normalization", dest="normalization", metavar="NORMALIZATION", default="NFC",

    60         help="Unicode normalization (none, NFD, NFKD, NFC, NFKC, FCD, default is NFC)")

    61 optParser.add_option("-o", "--output", dest="outputFile", metavar="FILE",

    62         help="place output in file FILE")

    63 optParser.add_option("-p", "--parse-only", action="store_true", dest="parseonly",

    64         help="parse only, then output pyAST as text to stdout", default=False)

    65 optParser.add_option("-P", "--pretty", action="store_true", default=False,

    66         help="pretty print output adding whitespace")

    67 optParser.add_option("-s", "--stringparamdict", dest="stringparams", metavar="STRINGPARAMS",

    68         help="call X/YSLT script with dictionary STRINGPARAMS as string parameters")

    69 optParser.add_option("-x", "--xml", action="store_true", default=False,

    70         help="input document is XML already")

    71 optParser.add_option("-X", "--xslt", dest="xslt", metavar="XSLTSCRIPT",

    72         help="execute XSLT script XSLTSCRIPT")

    73 optParser.add_option("-y", "--yslt", dest="yslt", metavar="YSLTSCRIPT",

    74         help="execute YSLT script YSLTSCRIPT")

    75 optParser.add_option("-Y", "--xml2yml", action="store_true", default=False,

    76         help="convert XML to normalized YML code")

    77 optParser.add_option("-V", "--version", action="callback", callback=printInfo, help="show version info and exit")

    78 (options, args) = optParser.parse_args()

    79 

    80 if options.old_syntax:

    81     oldSyntax()

    82 

    83 if options.trace:

    84     backend.enable_tracing = True

    85 

    86 if options.emitlinenumbers:

    87     backend.emitlinenumbers = True

    88 

    89 if options.includePathText:

    90     backend.includePath = options.includePathText.split(':')

    91 

    92 backend.encoding = options.encoding

    93 

    94 dirs = os.environ.get('YML_PATH', '.').split(':')

    95 backend.includePath.extend(dirs)

    96 

    97 if options.xml2yml:

    98     for directory in backend.includePath:

    99         try:

   100             name = directory + "/xml2yml.ysl2"

   101             f = open(name, "r")

   102             f.close()

   103             break

   104         except:

   105             pass

   106 

   107     options.yslt = name

   108     options.xml = True

   109 

   110 if  (options.xslt and options.yslt) or (options.xslt and options.xpath) or (options.yslt and options.xpath):

   111     sys.stderr.write("Cannot combine --xpath, --xslt and --yslt params\n")

   112     sys.exit(1)

   113 

   114 try:

   115     ymlC = ymlCStyle()

   116 

   117     rtext = u""

   118 

   119     if not options.emptyinput:

   120         files = fileinput.input(args, mode="rU", openhook=fileinput.hook_encoded(options.encoding))

   121 

   122         if options.xml:

   123             rtext = ""

   124             for line in files:

   125                 rtext += line

   126         else:

   127             result = parse(ymlC, files, True, comment)

   128             if options.parseonly:

   129                 print(result)

   130                 sys.exit(0)

   131             else:

   132                 rtext = backend.finish(result)

   133 

   134     if not rtext:

   135         rtext = u"<empty/>"

   136 

   137     def ymldebug(context, text):

   138         if options.trace:

   139             sys.stderr.write("Debug: " + codecs.encode(u(text), options.encoding) + "\n")

   140         return ""

   141 

   142     def ymlassert(context, value, msg):

   143         if options.trace:

   144             if not value:

   145                 raise YMLAssert(msg)

   146         return ""

   147 

   148     ymlns = etree.FunctionNamespace("http://fdik.org/yml")

   149     ymlns.prefix = "yml"

   150     ymlns['debug'] = ymldebug

   151     ymlns['assert'] = ymlassert

   152 

   153     if options.xpath:

   154         tree = etree.fromstring(rtext)

   155         ltree = tree.xpath(codecs.decode(options.xpath, options.encoding))

   156         rtext = u""

   157         try:

   158             for rtree in ltree:

   159                 rtext += etree.tostring(rtree, pretty_print=options.pretty, encoding=unicode)

   160         except:

   161             rtext = ltree

   162 

   163     elif options.yslt or options.xslt:

   164         params = {}

   165 

   166         if options.yslt:

   167             backend.clearAll()

   168             yscript = fileinput.input(options.yslt, mode="rU", openhook=fileinput.hook_encoded(options.encoding))

   169             yresult = parse(ymlC, yscript, True, comment)

   170             ytext = backend.finish(yresult)

   171         else:

   172             yscript = fileinput.input(options.xslt, mode="rU")

   173             ytext = ""

   174             for line in yscript:

   175                 ytext += line

   176 

   177         doc = etree.fromstring(rtext)

   178 

   179         xsltree = etree.XML(ytext, base_url=os.path.abspath(yscript.filename()))

   180         transform = etree.XSLT(xsltree)

   181         

   182         if options.params:

   183             params = eval(options.params)

   184             for key, value in params.iteritems():

   185                 if type(value) != unicode:

   186                     params[key] = u(value)

   187         if options.stringparams:

   188             for key, value in eval(options.stringparams).iteritems():

   189                 params[key] = u"'" + u(value) + u"'"

   190 

   191         rresult = transform(doc, **params)

   192         # lxml is somewhat buggy

   193         try:

   194             rtext = u(rresult)

   195         except:

   196             rtext = etree.tostring(rresult, encoding=unicode)

   197             if not rtext:

   198                 rtext = codecs.decode(str(rresult), "utf-8")

   199 

   200     if options.normalization != "none":

   201         rtext = unicodedata.normalize(options.normalization, rtext)

   202 

   203     if options.pretty:

   204         plaintext = etree.tostring(etree.fromstring(rtext), pretty_print=True, xml_declaration=True, encoding=options.encoding)

   205     else:

   206         if isinstance(rtext, unicode):

   207             plaintext = codecs.encode(rtext, options.encoding)

   208         else:

   209             plaintext = str(rtext)

   210 

   211     try:

   212         if plaintext[-1] == "\n":

   213             plaintext = plaintext[:-1]

   214     except: pass

   215 

   216     if options.outputFile and options.outputFile != "-":

   217         outfile = open(options.outputFile, "w")

   218         outfile.write(plaintext)

   219         outfile.close()

   220     else:

   221         print(plaintext)

   222 

   223 except KeyboardInterrupt:

   224     w("\n")

   225     sys.exit(1)

   226 except YMLAssert as msg:

   227     w(u"YML Assertion failed: " + u(msg) + u"\n")

   228     sys.exit(2)

   229 except KeyError as msg:

   230     w(u"not found: " + u(msg) + u"\n")

   231     sys.exit(4)

   232 except LookupError as msg:

   233     w(u"not found: " + u(msg) + u"\n")

   234     sys.exit(4)

   235 except etree.XMLSyntaxError as e:

   236     log = e.error_log.filter_from_level(etree.ErrorLevels.FATAL)

   237     for entry in log:

   238         w(u"XML error: " + u(entry.message) + u"\n")

   239     sys.exit(5)

   240 except Exception as msg:

   241     w(msg)

   242     sys.exit(5)