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#!/usr/bin/env python3

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# vim: set fileencoding=utf-8 :

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"""\

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YML 2 compiler version 6.2

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Copyleft (c), 2009-2020, Volker Birk  http://fdik.org/yml/

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"""

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import sys, os, codecs, locale

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import fileinput, unicodedata

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from optparse import OptionParser

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from yml2.pyPEG import parse, u

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from yml2.grammar import ymlCStyle, comment, oldSyntax

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import yml2.backend as backend

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YML_DEFAULT_PATH = [os.path.dirname(backend.__file__)]

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

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    sys.stdout.write(__doc__)

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    sys.exit(0)

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def w(msg):

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    if isinstance(msg, BaseException):

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        msg = str(msg) + "\n"

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    if type(msg) is bytes:

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

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    sys.stderr.write(msg)

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def main():

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    optParser = OptionParser()

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

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

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

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

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

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

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

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

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

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

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

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

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

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            help="place output in file FILE")

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

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

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

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    (options, args) = optParser.parse_args()

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    if options.old_syntax:

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        oldSyntax()

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    if options.emitlinenumbers:

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        backend.emitlinenumbers = True

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    backend.encoding = options.encoding

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    try:

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        if options.includePathText:

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

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

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        backend.includePath.extend(dirs)

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

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        ymlC = ymlCStyle()

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

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        if options.parseonly:

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            print(result)

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        else:

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            result = backend.finish(result)

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            if options.normalization != "none":

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                result = unicodedata.normalize(options.normalization, result)

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

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                outfile = open(options.outputFile, "wb")

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                outfile.write(codecs.encode(result, options.encoding))

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                outfile.close()

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            else:

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                sys.stdout.buffer.write(codecs.encode(result, options.encoding))

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                print()

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    except KeyboardInterrupt:

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        w("\n")

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        sys.exit(1)

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    except KeyError as msg:

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

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        sys.exit(4)

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    except LookupError as msg:

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

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        sys.exit(4)

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    except Exception as msg:

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        w(msg)

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        sys.exit(5)

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if __name__ == "__main__":

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    main()