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/* Copyright (c) 1997-2024
Ewgenij Gawrilow, Michael Joswig, and the polymake team
Technische Universität Berlin, Germany
https://polymake.org
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version: http://www.gnu.org/licenses/gpl.txt.
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
GNU General Public License for more details.
--------------------------------------------------------------------------------
*/
#pragma once
#include "polymake/Array.h"
#include "polymake/vector"
#include <string>
namespace pm {
class PolynomialVarNames
{
public:
/// the default naming scheme depending on the coefficient nesting level:
/// x, y, z, u, v, w for nesting levels 0..6 and t for anything above
static constexpr char default_varname(int nesting_level)
{
return static_cast<char>(nesting_level < 3 ? 'x' + nesting_level : nesting_level < 6 ? 'v' + nesting_level-3 : 't');
}
/// set the default naming scheme
explicit PolynomialVarNames(int nesting_level);
/// set the desired names
/// the last name in the sequence works as a pattern for all excess variables:
/// it is concatenated with "_NN" where NN is the variable index less the number of fixed names
explicit PolynomialVarNames(const Array<std::string>& names)
: explicit_names(names) {}
/// get the current list of explicit names
const Array<std::string>& get_names() const { return explicit_names; }
/// get the name of the variable with the given index
/// @param index variable index
/// @param n_vars number of variables in the polynomial class
/// if the index exceeds the number of the explicit names, the variable name will be generated
/// according to the pattern "{LastExplicitName}_{IndexExcess}"
/// if the index refers to the last explicit name and \a n_vars exceeds the number of explicit names,
/// the variable name is "{LastExplicitName}_0"
const std::string& operator() (Int index, Int n_vars) const;
/// set the explicit variable names
void set_names(const Array<std::string>& names);
void swap(PolynomialVarNames& other);
private:
/// explicit variable names set by the application
Array<std::string> explicit_names;
/// the cache for automatically generated names of variables with indexes beyond the explicit list
mutable std::vector<std::string> generated_names;
};
}
namespace polymake {
using pm::PolynomialVarNames;
}
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