Package gavo :: Package grammars :: Module common

Module common

Base classes and common code for grammars.

NOTE: If you add grammars, you have to enter manually them in rscdef.builtingrammars.GRAMMAR_REGISTRY (we don't want to import all the mess in this package just to make that).

Classes
	ParseError is an error raised by grammars if their input is somehow wrong.
	REAttribute is an attribute containing (compiled) RE
	FilteredInputFile a pseudo-file that allows piping data thorugh a shell command.
	Rowfilter A generator for rows coming from a grammar.
	SourceFieldApp A procedure application that returns a dictionary added to all incoming rows.
	MapKeys Mapping of names, specified in long or short forms.
	RowIterator An object that encapsulates the a source being parsed by a grammar.
	FileRowIterator is a RowIterator base for RowIterators reading files.
	FileRowAttributes A mixin for grammars with FileRowIterators.
	GrammarMacroMixin A collection of macros available to rowfilters.
	Grammar An abstract grammar.
	NullGrammar A grammar that never returns any rows.
	TransparentGrammar A grammar that returns its sourceToken as the row iterator.

Functions

compileRowfilter(filters)
returns an iterator that "pipes" the rowfilters in filters.

source code

Variables
	__package__ = `'gavo.grammars'`

Function Details

compileRowfilter(filters)

source code

returns an iterator that "pipes" the rowfilters in filters.

This means that the output of filters[0] is used as arguments to filters[1] and so on.

If filters is empty, None is returned.