1 # YML 2.5.3 language definition

     2 

     3 # written by VB.

     4 

     5 import re

     6 from pyPEG import keyword, _and, _not

     7 

     8 # pyPEG:

     9 #

    10 #   basestring:     terminal symbol (characters)

    11 #   keyword:        terminal symbol (keyword)

    12 #   matchobj:       terminal symbols (regex, use for scanning symbols)

    13 #   function:       named non-terminal symbol, recursive definition

    14 #                   if you don't want naming in output, precede name with an underscore

    15 #   tuple:          production sequence

    16 #   integer:        count in production sequence:

    17 #                    0: following element is optional

    18 #                   -1: following element can be omitted or repeated endless

    19 #                   -2: following element is required and can be repeated endless

    20 #   list:           options, choose one of them

    21 #   _not:           next element in production sequence is matched only if this would not

    22 #   _and:           next element in production sequence is matched only if this would, too

    23 

    24 newSyntax = True

    25 

    26 def oldSyntax():

    27     global newSyntax

    28     newSyntax = False

    29 

    30 def _if(cond, val):

    31     if cond:

    32         return val

    33     else:

    34         return ()

    35 

    36 def listing(x):     return x, -1, (",", x)

    37 r = re.compile

    38 

    39 comment = [r(r"//.*"), r(r"/\*.*?\*/", re.S)]

    40 _symbol = r"(?=\D)\w(\w|:)*"

    41 symbol = r(_symbol, re.U)

    42 pointer = r(r"\*" + _symbol, re.U)

    43 ppointer = r(r"\*\*" + _symbol, re.U)

    44 macro = r(r"\%" + _symbol, re.U)

    45 reference = r(r"\&" + _symbol, re.U)

    46 

    47 NameStartChar = ur''':|[A-Z]|_|[a-z]|[\u00C0-\u00D6]|[\u00D8-\u00F6]|[\u00F8-\u02FF]|[\u0370-\u037D]|[\u037F-\u1FFF]|[\u200C-\u200D]|[\u2070-\u218F]|[\u2C00-\u2FEF]|[\u3001-\uD7FF]|[\uF900-\uFDCF]|[\uFDF0-\uFFFD]'''

    48 NameChar = NameStartChar + ur'''|-|\.|[0-9]|\u00B7|[\u0300-\u036F]|[\u203F-\u2040]'''

    49 

    50 _xmlSymbol = u"(" + NameStartChar + u")(" + NameChar + u")*"

    51 xmlSymbol = r(_xmlSymbol)

    52 aliasSymbol = r(ur"-|(" + _xmlSymbol + ur")")

    53 

    54 literal = [r(r'""".*?"""', re.S), r(r"'''.*?'''", re.S), r(r"""-?\d+\.\d*|-?\.\d+|-?\d+|".*?"|'.*?'""")]

    55 filename = [("'", r(r"[^']*"), "'"), ('"', r(r'[^"]*'), '"'), r(r"[^\s;]+")]

    56 ws = r(r"\s+", re.U)

    57 

    58 def pyExp():        return "!", r(r"(!=|\\!|[^!])+"), "!"

    59 value = [literal, pyExp]

    60 

    61 def tagQuote():     return r(r"\].*|\<.*?\>")

    62 def lineQuote():    return r(r"\|.*")

    63 def quote():        return [r(r"\d*>.*"), (literal, 0, [";", "."])]

    64 def parm():         return [([xmlSymbol, pyExp, pointer, macro], "=", [value, pointer, symbol]), value, pointer]

    65 def parm_eq():      return [xmlSymbol, pyExp, pointer, macro], "=", [value, pointer, symbol]

    66 parm_eq.__name__ = "parm"

    67 _func = [symbol, ppointer, pointer, reference], _if(newSyntax, (-1, ("[", listing(parm), "]"))), 0, ("(", listing(parm), ")"), 0, listing(parm), -1, parm_eq

    68 def pythonCall():   return keyword("python"), _func, [";", "."]

    69 def declParm():     return [pointer, macro, xmlSymbol], 0, ("=", literal)

    70 def alias():        return keyword("alias"), aliasSymbol

    71 def descend():      return r(r"[+@*]" + _symbol, re.U)

    72 def base():         return keyword("is"), symbol

    73 def shape():        return symbol

    74 def decl():         return symbol, 0, base, 0, ("<", listing(shape), ">"), -1, descend, _if(newSyntax, (-1, ("[", 0, listing(declParm), "]"))), 0, ("(", 0, listing(declParm), ")"), 0, alias, 0, content

    75 def python():       return [r(r"!!.*?!!", re.S), r(r"!.*")]

    76 def operator():     return 0, keyword("define"), keyword("operator"), literal, keyword("as"), r(r".*")

    77 def constant():     return 0, keyword("define"), [pointer, symbol], "=", literal, 0, [";", "."]

    78 def in_ns():        return keyword("in"), xmlSymbol, [_decl, ("{", -2, _decl, "}")]

    79 _decl = keyword("decl"), listing(decl), [";", "."]

    80 def textsection():  return r(r'(\|\|(\>*).*?\|\|(\>*))|(\>\>.*?\>\>)', re.S)

    81 def include():      return keyword("include"), 0, reverse, 0, [ktext, kxml], filename, 0, [";", "."]

    82 def func():         return _func, 0, content

    83 def funclist():     return listing(func)

    84 _cmd = funclist, 0, [";", "."]

    85 _inner = [include, textsection, pythonCall, _cmd, quote, lineQuote, tagQuote, pyExp]

    86 _cc = "{", -1, _inner, "}"

    87 def content_plain(): return [ (_l, 0, _p, 0, _b, 0, _cc), (_p, 0, _b, 0, _cc), (_b, 0, _cc), _cc ]

    88 content_plain.__name__ = "content"

    89 def func_plain():   return _func, 0, content_plain

    90 func_plain.__name__ = "func"

    91 def flist_plain():  return -2, func_plain

    92 flist_plain.__name__ = "funclist"

    93 def xbase():        return flist_plain

    94 def generic():      return flist_plain

    95 def subscript():    return flist_plain

    96 def parentheses():  return "(", 0, funclist, ")"

    97 def fparm():        return flist_plain

    98 

    99 _l = _if(newSyntax, ("<", listing(generic), ">"))

   100 _p = _if(not newSyntax, parentheses), _if(newSyntax, ("(", 0, listing(fparm), ")"))

   101 _b = (":", listing(xbase))

   102 _c = [_inner, _cc]

   103 

   104 def content():      return [ (_l, 0, _p, 0, _b, 0, _c), (_p, 0, _b, 0, _c), (_b, 0, _c), _c ]

   105 def reverse():      return keyword("reverse")

   106 def ktext():        return keyword("text")

   107 def kxml():         return keyword("xml")

   108 def ymlCStyle():    return -1, [_decl, in_ns, include, python, operator, constant, tagQuote, lineQuote, quote, _cmd]