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Pawel Orlowicz authored00defdd2
tolower.h 2.05 KiB
/*
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_TOLOWER_H
#define LIBWCCL_OPS_FUNCTIONS_STRSET_TOLOWER_H
#include <libwccl/values/strset.h>
#include <libwccl/ops/function.h>
namespace Wccl {
/**
* Operator that takes a set of strings and returns a new
* set with corresponding values in lower case form
*/
class ToLower : public Function<StrSet>
{
public:
typedef boost::shared_ptr<Function<StrSet> > StrSetFunctionPtr;
ToLower(const StrSetFunctionPtr& strset_expr)
: strset_expr_(strset_expr)
{
BOOST_ASSERT(strset_expr_);
}
/**
* @returns String representation of the function in the form of:
* "lower(strset_expr_string)"
*/
std::string to_string(const Corpus2::Tagset& tagset) const;
/**
* @returns Name of the function: "lower"
*/
std::string raw_name() const {
return "lower";
}
protected:
const StrSetFunctionPtr strset_expr_;
/**
* Get a string set from the argument expression and return copy of the set
* with all strings in lower case form
*/
BaseRetValPtr apply_internal(const FunExecContext& context) const;
/**
* Writes raw string representation of the function in the form of:
* "lower(strset_expr_raw_string)"
* @note This version does not require tagset, but may be inclomplete
* and/or contain internal info.
* @returns Stream writte to.
*/
std::ostream& write_to(std::ostream& ostream) const;
};
} /* end ns Wccl */
#endif // LIBWCCL_OPS_FUNCTIONS_STRSET_TOLOWER_H