pyparsing-users

[Pyparsing] Bug report: setResultsName works inconsistently on Optional in Each

[Max R. <max...@gm...>]

It seems that Optional.setResultsName joined by Each does not behave
consistently with other ParserElements. For example:

>>> (Optional('foo')('one') & pp.Optional('bar')('two')).parseString('foo
bar')
(['foo', 'bar'], {})
>>> (Optional('bar')('two') & Optional('foo')('one')).parseString('foo bar')
(['foo', 'bar'], {'two': [('bar', 1)]})

A workaround is to name the Literals themselves instead of the Optionals:

>>> (Optional(Literal('bar')('two')) &
Optional(Literal('foo')('one'))).parseString('foo bar')
(['foo', 'bar'], {'two': [('bar', 1)], 'one': [('foo', 0)]})
>>> (Optional(Literal('foo')('one')) &
Optional(Literal('bar')('two'))).parseString('foo bar')
(['foo', 'bar'], {'two': [('bar', 1)], 'one': [('foo', 0)]})

The problem does not manifest when joining Optional objects with And:

>>> (Optional('foo')('one') + pp.Optional('bar')('two')).parseString('foo
bar')
(['foo', 'bar'], {'two': [('bar', 1)], 'one': [('foo', 0)]})

Thanks,
Max

Re: [Pyparsing] Bug report: setResultsName works inconsistently on Optional in Each

[Paul M. <pt...@au...>]

Nice report, Max, especially boiling the bug repro down to a single
statement - very helpful!

Just finishing the check-in of a fix to SourceForge SVN, will be included in
the next release.

-- Paul



-----Original Message-----
From: Max Rothman [mailto:max...@gm...] 
Sent: Sunday, November 08, 2015 8:15 PM
To: pyp...@li...
Subject: [Pyparsing] Bug report: setResultsName works inconsistently on
Optional in Each

It seems that Optional.setResultsName joined by Each does not behave
consistently with other ParserElements. For example:

>>> (Optional('foo')('one') & 
>>> pp.Optional('bar')('two')).parseString('foo
bar')
(['foo', 'bar'], {})
>>> (Optional('bar')('two') & Optional('foo')('one')).parseString('foo 
>>> bar')
(['foo', 'bar'], {'two': [('bar', 1)]})

A workaround is to name the Literals themselves instead of the Optionals:

>>> (Optional(Literal('bar')('two')) &
Optional(Literal('foo')('one'))).parseString('foo bar') (['foo', 'bar'],
{'two': [('bar', 1)], 'one': [('foo', 0)]})
>>> (Optional(Literal('foo')('one')) &
Optional(Literal('bar')('two'))).parseString('foo bar') (['foo', 'bar'],
{'two': [('bar', 1)], 'one': [('foo', 0)]})

The problem does not manifest when joining Optional objects with And:

>>> (Optional('foo')('one') + 
>>> pp.Optional('bar')('two')).parseString('foo
bar')
(['foo', 'bar'], {'two': [('bar', 1)], 'one': [('foo', 0)]})

Thanks,
Max
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