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232a45bc14
The utilities of the new util/formatted_output.h header complement the existing base/output.h with the text-formatting support needed to produce tabular output. Fixes #4449
123 lines
2.4 KiB
C++
123 lines
2.4 KiB
C++
/*
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* \brief Utilities for formatted text output
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* \author Norman Feske
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* \date 2022-03-14
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*/
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/*
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* Copyright (C) 2022 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__OS__UTIL__FORMATTED_OUTPUT_H_
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#define _INCLUDE__OS__UTIL__FORMATTED_OUTPUT_H_
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#include <base/output.h>
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namespace Genode {
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template <typename> struct Truncated;
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template <typename> struct Repeated;
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template <typename> struct Left_aligned;
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template <typename> struct Right_aligned;
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/**
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* Return the number of characters needed when rendering 'args' as text
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*/
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template <typename... ARGS>
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static unsigned printed_length(ARGS &&... args)
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{
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struct _Output : Output
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{
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unsigned count = 0;
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void out_char(char) override { count++; }
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} _output;
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print(_output, args...);
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return _output.count;
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}
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}
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template <typename T>
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struct Genode::Truncated
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{
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unsigned const _limit;
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T const &_arg;
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Truncated(unsigned limit, T const &arg) : _limit(limit), _arg(arg) { }
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void print(Output &out) const
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{
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struct _Output : Output
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{
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Output &out;
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unsigned const limit;
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unsigned count = 0;
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void out_char(char c) override
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{
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if (count++ < limit)
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out.out_char(c);
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}
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_Output(Output &out, unsigned limit) : out(out), limit(limit) { }
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} _output(out, _limit);
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Genode::print(_output, _arg);
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}
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};
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template <typename T>
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struct Genode::Repeated
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{
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unsigned const _n;
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T const &_arg;
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Repeated(unsigned n, T const &arg) : _n(n), _arg(arg) { }
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void print(Output &out) const
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{
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for (unsigned i = 0; i < _n; i++)
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Genode::print(out, _arg);
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}
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};
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template <typename T>
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struct Genode::Left_aligned
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{
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unsigned const _n;
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T const &_arg;
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Left_aligned(unsigned n, T const &arg) : _n(n), _arg(arg) { }
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void print(Output &out) const
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{
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unsigned const len = min(printed_length(_arg), _n);
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Genode::print(out, Truncated(len, _arg), Repeated(_n - len, Char(' ')));
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}
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};
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template <typename T>
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struct Genode::Right_aligned
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{
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unsigned const _n;
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T const &_arg;
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Right_aligned(unsigned n, T const &arg) : _n(n), _arg(arg) { }
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void print(Output &out) const
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{
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unsigned const len = min(printed_length(_arg), _n);
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Genode::print(out, Repeated(_n - len, Char(' ')), Truncated(len, _arg));
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}
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};
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#endif /* _INCLUDE__OS__UTIL__FORMATTED_OUTPUT_H_ */
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