Module pyparsing :: Class FollowedBy |
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# Class FollowedBy

source code

         object --+
                  |
      ParserElement --+
                      |
    ParseElementEnhance --+
                          |
                         FollowedBy

Lookahead matching of the given parse expression. `FollowedBy` does *not* advance the parsing position within the input string, it only verifies that the specified parse expression matches at the current position. `FollowedBy` always returns a null token list.

Example:

       # use FollowedBy to match a label only if it is followed by a ':'
       data_word = Word(alphas)
       label = data_word + FollowedBy(':')
       attr_expr = Group(label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join))

       OneOrMore(attr_expr).parseString("shape: SQUARE color: BLACK posn: upper left").pprint()

prints:

       [['shape', 'SQUARE'], ['color', 'BLACK'], ['posn', 'upper left']]

Instance Methods
__init__(self, expr) x.__init__(...) initializes x; see help(type(x)) for signature | source code
parseImpl(self, instring, loc, doActions=True) | source code
Inherited from `ParseElementEnhance`: `__str__`, `checkRecursion`, `ignore`, `leaveWhitespace`, `streamline`, `validate` Inherited from `ParserElement`: `__add__`, `__and__`, `__call__`, `__eq__`, `__hash__`, `__invert__`, `__mul__`, `__ne__`, `__or__`, `__radd__`, `__rand__`, `__repr__`, `__req__`, `__rmul__`, `__rne__`, `__ror__`, `__rsub__`, `__rxor__`, `__sub__`, `__xor__`, `addCondition`, `addParseAction`, `canParseNext`, `copy`, `matches`, `parseFile`, `parseString`, `parseWithTabs`, `postParse`, `preParse`, `runTests`, `scanString`, `searchString`, `setBreak`, `setDebug`, `setDebugActions`, `setFailAction`, `setName`, `setParseAction`, `setResultsName`, `setWhitespaceChars`, `split`, `suppress`, `transformString`, `tryParse` Inherited from `object`: `__delattr__`, `__format__`, `__getattribute__`, `__new__`, `__reduce__`, `__reduce_ex__`, `__setattr__`, `__sizeof__`, `__subclasshook__`

Static Methods
Inherited from `ParserElement`: `enablePackrat`, `inlineLiteralsUsing`, `resetCache`, `setDefaultWhitespaceChars`

Class Variables
Inherited from `ParserElement`: `DEFAULT_WHITE_CHARS`, `packrat_cache`, `packrat_cache_lock`, `packrat_cache_stats`, `verbose_stacktrace`

Properties
Inherited from `object`: `__class__`

Method Details

### __init__(self, expr) (Constructor) | source code
x.__init__(...) initializes x; see help(type(x)) for signature Overrides: object.__init__ (inherited documentation)

### parseImpl(self, instring, loc, doActions=True) | source code
Overrides: ParserElement.parseImpl