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/*
Copyright (C) 2011 Adam Wardyński, Tomasz Śniatowski, Paweł Kędzia,
Adam Radziszewski, Bartosz Broda
Part of the WCCL project
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.
See the LICENSE, COPYING.LESSER and COPYING files for more details.
*/
#ifndef LIBWCCL_OPS_FUNCTIONS_STRSET_PROPVAL_H
#define LIBWCCL_OPS_FUNCTIONS_STRSET_PROPVAL_H
#include <libwccl/values/position.h>
#include <libwccl/values/strset.h>
#include <libwccl/ops/function.h>
namespace Wccl {
/**
* Operator that takes a position and a set of strings denoting property keys
* and return union of property values obtained via given keys from the
* metadata assigned to a token occupying the given position.
* If position out of sentence boundaries, will return an empty set. Also,
* if some of the given keys are not present in the metadata (or no metadata
* present at all at the given position), no error is raised but the keys
* are silently ignored. This may result in empty value set return.
*/
class PropVal : public Function<StrSet>
{
public:
typedef boost::shared_ptr<Function<Position> > PosFunctionPtr;
typedef boost::shared_ptr<Function<StrSet> > StrSetFunctionPtr;
PropVal(const PosFunctionPtr& pos_expr,
const StrSetFunctionPtr& strset_expr)
: pos_expr_(pos_expr),
strset_expr_(strset_expr)
{
BOOST_ASSERT(pos_expr_);
BOOST_ASSERT(strset_expr_);
}
/**
* String representation of the operator in form of:
* "prop(pos_expr_string, strset_expr_string)"
*/
std::string to_string(const Corpus2::Tagset& tagset) const;
/**
* @returns Name of the function: "affix"
*/
std::string raw_name() const {
return "prop";
}
protected:
const PosFunctionPtr pos_expr_;
const StrSetFunctionPtr strset_expr_;
/**
* Get a string set that aggregates all property values retrieved from
* the given position using the given key set.
*/
BaseRetValPtr apply_internal(const FunExecContext& context) const;
/**
* Writes raw string representation of the operator in form of:
* "prop(pos_expr_string, strset_expr_raw_string)"
* @note This version doesn't require tagset, but may be incomplete and/or
* contain internal info.
* @returns Stream written to.
*/
std::ostream& write_to(std::ostream& ostream) const;
};
} /* end ns Wccl */
#endif // LIBWCCL_OPS_FUNCTIONS_STRSET_PROPVAL_H