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Library: Assessment and plan for a text templating engine

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Conducted an extended investigation regarding text templating
and the library solutions available and still maintained today.

The conclusion is
 * there are some mature and widely used solutions available for C++
 * all of these are considered a mismatch for the task at hand,
   which is to generate Gnuplot scripts for test data visualisation

Points of contention
 * all solutions offer a massive feature set, oriented towards web content generation
 * all solutions provide their own structured data type or custom property-tree framework

**Decision** 🠲  better to write a minimalistic templating engine from scratch rather
This commit is contained in:
Fischlurch 2024-03-18 22:32:49 +01:00
parent d3fda114f8
commit af1f549190
6 changed files with 660 additions and 3 deletions
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72
src/lib/gnuplot-gen.hpp Normal file
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@ -0,0 +1,72 @@
/*
GNUPLOT-GEN.hpp - setup for simplified data visualisation via Gnuplot
Copyright (C) Lumiera.org
2024, Hermann Vosseler <Ichthyostega@web.de>
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 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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** @file gnuplot-gen.hpp
** Preconfigured setup for data visualisation with Gnuplot.
** The visualisation tool [gnuplot] allows for simple data visualisation
** in various formats, integrated into a *NIX commandline work environment.
**
** The namespace lib::gnuplot_gen provides ....
**
** @todo 3/2024 this is an initial draft, shaped by the immediate need to visualise
** [measurement data](\ref vault::gear::test::SchedulerStress_test) collected
** while testing the new [Scheduler](\ref scheduler.hpp) implementation.
**
** ## Usage
** TBW
** - blah
** - blubb
**
** @see GnuplotGen_test
** @see SchedulerStress_test
** @see text-template.hpp
** [gnuplot]: https://booooooooooooo
*/
#ifndef LIB_GNUPLOT_GEN_H
#define LIB_GNUPLOT_GEN_H
//#include "lib/format-util.hpp"
#include "lib/text-template.hpp"
//#include "lib/util.hpp"
//#include <utility>
//#include <sstream>
//#include <string>
//#include <vector>
namespace lib {
namespace gnuplot_gen { ///< preconfigured setup for Gnuplot data visualisation
// using util::toString;
// using util::isnil;
// using std::string;
// using std::move;
}} // namespace lib::gnuplot_gen
#endif /*LIB_GNUPLOT_GEN_H*/

55
src/lib/text-template.hpp Normal file
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@ -0,0 +1,55 @@
/*
TEXT-TEMPLATE.hpp - minimalistic text substitution engine
Copyright (C) Lumiera.org
2024, Hermann Vosseler <Ichthyostega@web.de>
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 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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** @file text-template.hpp
** A minimalistic text templating engine with flexible data binding.
**
** @todo WIP-WIP-WIP 3/2024
** @see TextTemplate_test
** @see gnuplot-gen.hpp
** @see SchedulerStress_test
*/
#ifndef LIB_TEXT_TEMPLATE_H
#define LIB_TEXT_TEMPLATE_H
#include "lib/error.hpp"
//#include "lib/util.hpp"
//#include <cmath>
//#include <limits>
//#include <stdint.h>
//#include <boost/rational.hpp>
namespace lib {
// using Rat = boost::rational<int64_t>;
// using boost::rational_cast;
// using std::abs;
}// namespace lib
#endif /*LIB_TEXT_TEMPLATE_H*/

14
tests/15library.tests
View file

@ -414,12 +414,17 @@ return: 0
END
TEST "HashGenerator_test" HashGenerator_test <<END
PLANNED "generate a Gnuplot diagram" GnuplotGen_test <<END
return: 0
END
TEST "HashIndexed_test" HashIndexed_test <<END
TEST "generate hash values" HashGenerator_test <<END
return: 0
END
TEST "verify indexing by hash" HashIndexed_test <<END
return: 0
END
@ -775,6 +780,11 @@ return: 0
END
PLANNED "text template substitution" TextTemplate_test <<END
return: 0
END
TEST "tuple sequence utils" UtilTuple_test <<END
return: 0
END

136
tests/library/gnuplot-gen-test.cpp Normal file
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@ -0,0 +1,136 @@
/*
GnuplotGen(Test) - verify the minimalistic text substitution engine
Copyright (C) Lumiera.org
2024, Hermann Vosseler <Ichthyostega@web.de>
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 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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
* *****************************************************/
/** @file gnuplot-gen-test.cpp
** unit test \ref GnuplotGen_test
*/
#include "lib/test/run.hpp"
#include "lib/test/test-helper.hpp"///////////////////////TODO
#include "lib/gnuplot-gen.hpp"
#include "lib/format-cout.hpp"///////////////////////TODO
#include "lib/test/diagnostic-output.hpp"///////////////////////TODO
//#include <chrono>
//#include <array>
//using std::array;
namespace lib {
namespace test {
/***************************************************************************//**
* @test verify data visualisation by generated Gnuplot scripts
* - generate a simple pot
* - generate a scatter plot with regression line
* @see gnuplot-gen.hpp
* @see TextTemplate_test
*/
class GnuplotGen_test : public Test
{
virtual void
run (Arg)
{
simpeUsage();
verify_instantiation();
verify_keySubstituton();
verify_conditional();
verify_iteration();
verify_Map_binding();
verify_ETD_binding();
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
simpeUsage()
{
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
verify_instantiation()
{
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
verify_keySubstituton()
{
UNIMPLEMENTED ("nebbich");
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
verify_conditional()
{
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
verify_iteration()
{
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
verify_Map_binding()
{
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
verify_ETD_binding()
{
}
};
LAUNCHER (GnuplotGen_test, "unit common");
}} // namespace lib::test

139
tests/library/text-template-test.cpp Normal file
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@ -0,0 +1,139 @@
/*
TextTemplate(Test) - verify the minimalistic text substitution engine
Copyright (C) Lumiera.org
2024, Hermann Vosseler <Ichthyostega@web.de>
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 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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
* *****************************************************/
/** @file text-template-test.cpp
** unit test \ref TextTemplate_test
*/
#include "lib/test/run.hpp"
#include "lib/test/test-helper.hpp"///////////////////////TODO
#include "lib/text-template.hpp"
#include "lib/format-cout.hpp"///////////////////////TODO
#include "lib/test/diagnostic-output.hpp"///////////////////////TODO
//#include <chrono>
//#include <array>
//using std::array;
namespace lib {
namespace test {
/***************************************************************************//**
* @test verify a minimalistic text substitution engine with flexible
* data binding, used for tool integration and script generation
* - cover the core parsing and templating functionality,
* using a direct binding
* - demonstrate the default-binding for a data map
* - cover the binding to Lumiera's »External Tree Description«
* @see text-template.hpp
* @see GnuplotGen_test
*/
class TextTemplate_test : public Test
{
virtual void
run (Arg)
{
simpeUsage();
verify_instantiation();
verify_keySubstituton();
verify_conditional();
verify_iteration();
verify_Map_binding();
verify_ETD_binding();
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
simpeUsage()
{
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
verify_instantiation()
{
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
verify_keySubstituton()
{
UNIMPLEMENTED ("nebbich");
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
verify_conditional()
{
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
verify_iteration()
{
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
verify_Map_binding()
{
}
/** @test TODO
* @todo WIP 4/24 🔁 define ⟶ implement
*/
void
verify_ETD_binding()
{
}
};
LAUNCHER (TextTemplate_test, "unit common");
}} // namespace lib::test

247
wiki/thinkPad.ichthyo.mm
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@ -54040,7 +54040,7 @@
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@ -54178,6 +54178,10 @@
<icon BUILTIN="smily_bad"/>
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</node>
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</node>
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<pre http-equiv="content-type" content="text/html; charset=utf-8"><font size="1">mustache tmpl{&quot;Hello {{what}}!&quot;};
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mir ist kein Vorschlag bekannt; vermutlich haben die Leute die gleiche Analyse vollzogen, wie ich sie hier grade mache
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wenn man sich auf die <b>Essenz</b>&#160;beschr&#228;nkt, kann man es selber schreiben
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<b>Keinerlei</b>&#160;Annahmen &#252;ber die Datenypen
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