OpenQuizz
Une application de gestion des contenus pédagogiques
Forward Class Reference
Inheritance diagram for Forward:
Collaboration diagram for Forward:

Public Member Functions

def __init__ (self, other=None)
 
def __lshift__ (self, other)
 
def __ilshift__ (self, other)
 
def leaveWhitespace (self)
 
def streamline (self)
 
def validate (self, validateTrace=None)
 
def __str__ (self)
 
def copy (self)
 
- Public Member Functions inherited from ParseElementEnhance
def __init__ (self, expr, savelist=False)
 
def parseImpl (self, instring, loc, doActions=True)
 
def ignore (self, other)
 
def checkRecursion (self, parseElementList)
 
- Public Member Functions inherited from ParserElement
def setName (self, name)
 
def setResultsName (self, name, listAllMatches=False)
 
def setBreak (self, breakFlag=True)
 
def setParseAction (self, *fns, **kwargs)
 
def addParseAction (self, *fns, **kwargs)
 
def addCondition (self, *fns, **kwargs)
 
def setFailAction (self, fn)
 
def preParse (self, instring, loc)
 
def postParse (self, instring, loc, tokenlist)
 
def tryParse (self, instring, loc)
 
def canParseNext (self, instring, loc)
 
def parseString (self, instring, parseAll=False)
 
def scanString (self, instring, maxMatches=_MAX_INT, overlap=False)
 
def transformString (self, instring)
 
def searchString (self, instring, maxMatches=_MAX_INT)
 
def split (self, instring, maxsplit=_MAX_INT, includeSeparators=False)
 
def __add__ (self, other)
 
def __radd__ (self, other)
 
def __sub__ (self, other)
 
def __rsub__ (self, other)
 
def __mul__ (self, other)
 
def __rmul__ (self, other)
 
def __or__ (self, other)
 
def __ror__ (self, other)
 
def __xor__ (self, other)
 
def __rxor__ (self, other)
 
def __and__ (self, other)
 
def __rand__ (self, other)
 
def __invert__ (self)
 
def __iter__ (self)
 
def __getitem__ (self, key)
 
def __call__ (self, name=None)
 
def suppress (self)
 
def setWhitespaceChars (self, chars)
 
def parseWithTabs (self)
 
def setDebugActions (self, startAction, successAction, exceptionAction)
 
def setDebug (self, flag=True)
 
def __repr__ (self)
 
def parseFile (self, file_or_filename, parseAll=False)
 
def __eq__ (self, other)
 
def __ne__ (self, other)
 
def __hash__ (self)
 
def __req__ (self, other)
 
def __rne__ (self, other)
 
def matches (self, testString, parseAll=True)
 
def runTests (self, tests, parseAll=True, comment='#', fullDump=True, printResults=True, failureTests=False, postParse=None, file=None)
 

Data Fields

 expr
 
 strRepr
 
 mayIndexError
 
 mayReturnEmpty
 
 skipWhitespace
 
 saveAsList
 
 streamlined
 
- Data Fields inherited from ParseElementEnhance
 expr
 
 strRepr
 
 mayIndexError
 
 mayReturnEmpty
 
 skipWhitespace
 
 saveAsList
 
 callPreparse
 
- Data Fields inherited from ParserElement
 parseAction
 
 failAction
 
 strRepr
 
 resultsName
 
 saveAsList
 
 skipWhitespace
 
 whiteChars
 
 copyDefaultWhiteChars
 
 mayReturnEmpty
 
 keepTabs
 
 ignoreExprs
 
 debug
 
 streamlined
 
 mayIndexError
 
 errmsg
 
 modalResults
 
 debugActions
 
 re
 
 callPreparse
 
 callDuringTry
 
 name
 

Additional Inherited Members

- Static Public Member Functions inherited from ParserElement
def setDefaultWhitespaceChars (chars)
 
def inlineLiteralsUsing (cls)
 
def resetCache ()
 
def enablePackrat (cache_size_limit=128)
 
- Static Public Attributes inherited from ParserElement
 DEFAULT_WHITE_CHARS
 
 verbose_stacktrace
 
 packrat_cache
 
 packrat_cache_lock
 
 packrat_cache_stats
 

Detailed Description

Forward declaration of an expression to be defined later -
used for recursive grammars, such as algebraic infix notation.
When the expression is known, it is assigned to the ``Forward``
variable using the '<<' operator.

Note: take care when assigning to ``Forward`` not to overlook
precedence of operators.

Specifically, '|' has a lower precedence than '<<', so that::

    fwdExpr << a | b | c

will actually be evaluated as::

    (fwdExpr << a) | b | c

thereby leaving b and c out as parseable alternatives.  It is recommended that you
explicitly group the values inserted into the ``Forward``::

    fwdExpr << (a | b | c)

Converting to use the '<<=' operator instead will avoid this problem.

See :class:`ParseResults.pprint` for an example of a recursive
parser created using ``Forward``.

Constructor & Destructor Documentation

◆ __init__()

def __init__ (   self,
  other = None 
)

Reimplemented from ParserElement.

Member Function Documentation

◆ __ilshift__()

def __ilshift__ (   self,
  other 
)

◆ __lshift__()

def __lshift__ (   self,
  other 
)

◆ __str__()

def __str__ (   self)

Reimplemented from ParseElementEnhance.

◆ copy()

def copy (   self)
Make a copy of this :class:`ParserElement`.  Useful for defining
different parse actions for the same parsing pattern, using copies of
the original parse element.

Example::

    integer = Word(nums).setParseAction(lambda toks: int(toks[0]))
    integerK = integer.copy().addParseAction(lambda toks: toks[0] * 1024) + Suppress("K")
    integerM = integer.copy().addParseAction(lambda toks: toks[0] * 1024 * 1024) + Suppress("M")

    print(OneOrMore(integerK | integerM | integer).parseString("5K 100 640K 256M"))

prints::

    [5120, 100, 655360, 268435456]

Equivalent form of ``expr.copy()`` is just ``expr()``::

    integerM = integer().addParseAction(lambda toks: toks[0] * 1024 * 1024) + Suppress("M")

Reimplemented from ParserElement.

◆ leaveWhitespace()

def leaveWhitespace (   self)
Disables the skipping of whitespace before matching the characters in the
:class:`ParserElement`'s defined pattern.  This is normally only used internally by
the pyparsing module, but may be needed in some whitespace-sensitive grammars.

Reimplemented from ParseElementEnhance.

◆ streamline()

def streamline (   self)

Reimplemented from ParseElementEnhance.

◆ validate()

def validate (   self,
  validateTrace = None 
)
Check defined expressions for valid structure, check for infinite recursive definitions.

Reimplemented from ParseElementEnhance.

Field Documentation

◆ expr

expr

◆ mayIndexError

mayIndexError

◆ mayReturnEmpty

mayReturnEmpty

◆ saveAsList

saveAsList

◆ skipWhitespace

skipWhitespace

◆ streamlined

streamlined

◆ strRepr

strRepr

The documentation for this class was generated from the following file: