parser.hh
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parser.hh
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	/**
	* Copyright (©) 2013-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)
	* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
	*
	* This file is part of Akantu
	*
	* Akantu 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.
	*
	* Akantu 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 Lesser General Public License for more
	* details.
	*
	* You should have received a copy of the GNU Lesser General Public License
	* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
	*/

	/* -------------------------------------------------------------------------- */
	#include "aka_common.hh"
	#include "aka_random_generator.hh"
	/* -------------------------------------------------------------------------- */
	#include <map>
	/* -------------------------------------------------------------------------- */

	#ifndef AKANTU_PARSER_HH_
	#define AKANTU_PARSER_HH_

	namespace akantu {

	#if !defined(DOXYGEN)
	// clang-format off
	#define AKANTU_SECTION_TYPES \
	(cohesive_inserter) \
	(contact) \
	(embedded_interface) \
	(friction) \
	(global) \
	(heat) \
	(integration_scheme) \
	(material) \
	(phasefield) \
	(constitutive_law) \
	(mesh) \
	(model) \
	(model_solver) \
	(neighborhood) \
	(neighborhoods) \
	(non_linear_solver) \
	(non_local) \
	(rules) \
	(solver) \
	(time_step_solver) \
	(user) \
	(weight_function) \
	(contact_detector) \
	(contact_resolution) \
	(not_defined)
	// clang-format on

	/// Defines the possible section types
	AKANTU_CLASS_ENUM_DECLARE(ParserType, AKANTU_SECTION_TYPES)
	AKANTU_CLASS_ENUM_OUTPUT_STREAM(ParserType, AKANTU_SECTION_TYPES)
	AKANTU_CLASS_ENUM_INPUT_STREAM(ParserType, AKANTU_SECTION_TYPES)
	#else
	enum class ParserType {
	cohesive_inserter,
	contact,
	embedded_interface,
	friction,
	global,
	heat,
	integration_scheme,
	material,
	phasefield,
	mesh,
	model,
	model_solver,
	neighborhood,
	neighborhoods,
	non_linear_solver,
	non_local,
	rules,
	solver,
	time_step_solver,
	user,
	weight_function,
	not_defined
	};
	#endif

	/// Defines the possible search contexts/scopes (for parameter search)
	enum ParserParameterSearchCxt {
	_ppsc_current_scope = 0x1,
	_ppsc_parent_scope = 0x2,
	_ppsc_current_and_parent_scope = 0x3
	};
	/* ------------------------------------------------------------------------ */
	/* Parameters Class */
	/* ------------------------------------------------------------------------ */
	class ParserSection;

	/// @brief The ParserParameter objects represent the end of tree branches as
	/// they
	/// are the different informations contained in the input file.
	class ParserParameter {
	public:
	ParserParameter()
	: name(std::string()), value(std::string()), dbg_filename(std::string()) {
	}

	ParserParameter(const std::string & name, const std::string & value,
	const ParserSection & parent_section)
	: parent_section(&parent_section), name(name), value(value),
	dbg_filename(std::string()) {}

	ParserParameter(const ParserParameter & param) = default;

	virtual ~ParserParameter() = default;

	/// Get parameter name
	const std::string & getName() const { return name; }
	/// Get parameter value
	const std::string & getValue() const { return value; }

	/// Set info for debug output
	void setDebugInfo(const std::string & filename, Int line, Int column) {
	dbg_filename = filename;
	dbg_line = line;
	dbg_column = column;
	}

	template <typename T> inline operator T() const;

	template <typename T, Int m, Int n, std::enable_if_t<n == 1> * = nullptr>
	inline operator Matrix<T, m, n>() const;
	template <typename T, Int m, Int n, std::enable_if_t<n != 1> * = nullptr>
	inline operator Matrix<T, m, n>() const;

	/// Print parameter info in stream
	void printself(std::ostream & stream,
	__attribute__((unused)) unsigned int indent = 0) const {
	stream << name << ": " << value << " (" << dbg_filename << ":" << dbg_line
	<< ":" << dbg_column << ")";
	}

	private:
	void setParent(const ParserSection & sect) { parent_section = § }

	friend class ParserSection;

	private:
	/// Pointer to the parent section
	const ParserSection * parent_section{nullptr};
	/// Name of the parameter
	std::string name;
	/// Value of the parameter
	std::string value;
	/// File for debug output
	std::string dbg_filename;
	/// Position of parameter in parsed file
	Int dbg_line, dbg_column;
	};

	/* ------------------------------------------------------------------------ */
	/* Sections Class */
	/* ------------------------------------------------------------------------ */
	/// ParserSection represents a branch of the parsing tree.
	class ParserSection {
	public:
	using SubSections = std::multimap<ParserType, ParserSection>;
	using Parameters = std::map<std::string, ParserParameter>;

	private:
	using const_section_iterator_ = SubSections::const_iterator;

	public:
	/* ------------------------------------------------------------------------ */
	/* SubSection iterator */
	/* ------------------------------------------------------------------------ */
	/// Iterator on sections
	class const_section_iterator {
	public:
	using iterator_category = std::forward_iterator_tag;
	using value_type = ParserSection;
	using pointer = ParserSection *;
	using reference = ParserSection &;

	const_section_iterator() = default;
	const_section_iterator(const const_section_iterator_ & it) : it(it) {}
	const_section_iterator(const const_section_iterator & other) = default;
	const_section_iterator &
	operator=(const const_section_iterator & other) = default;

	const ParserSection & operator*() const { return it->second; }
	const ParserSection * operator->() const { return &(it->second); }

	bool operator==(const const_section_iterator & other) const {
	return it == other.it;
	}

	bool operator!=(const const_section_iterator & other) const {
	return it != other.it;
	}

	const_section_iterator & operator++() {
	++it;
	return *this;
	}

	const_section_iterator operator++(int) {
	const_section_iterator tmp = *this;
	operator++();
	return tmp;
	}

	private:
	const_section_iterator_ it;
	};

	/* ------------------------------------------------------------------------ */
	/* Parameters iterator */
	/* ------------------------------------------------------------------------ */
	/// Iterator on parameters
	class const_parameter_iterator {
	public:
	const_parameter_iterator(const const_parameter_iterator & other) = default;
	const_parameter_iterator(const Parameters::const_iterator & it) : it(it) {}

	const_parameter_iterator &
	operator=(const const_parameter_iterator & other) {
	if (this != &other) {
	it = other.it;
	}
	return *this;
	}

	const ParserParameter & operator*() const { return it->second; }
	const ParserParameter * operator->() { return &(it->second); };

	bool operator==(const const_parameter_iterator & other) const {
	return it == other.it;
	}

	bool operator!=(const const_parameter_iterator & other) const {
	return it != other.it;
	}

	const_parameter_iterator & operator++() {
	++it;
	return *this;
	}

	const_parameter_iterator operator++(int) {
	const_parameter_iterator tmp = *this;
	operator++();
	return tmp;
	}

	private:
	Parameters::const_iterator it;
	};

	/* ---------------------------------------------------------------------- */
	ParserSection() : name(std::string()) {}

	ParserSection(const std::string & name, ParserType type)
	: name(name), type(type) {}

	ParserSection(const std::string & name, ParserType type,
	const std::string & option,
	const ParserSection & parent_section)
	: parent_section(&parent_section), name(name), type(type),
	option(option) {}

	ParserSection(const ParserSection & section)
	: parent_section(section.parent_section), name(section.name),
	type(section.type), option(section.option),
	parameters(section.parameters),
	sub_sections_by_type(section.sub_sections_by_type) {
	setChldrenPointers();
	}

	ParserSection & operator=(const ParserSection & other) {
	if (&other != this) {
	parent_section = other.parent_section;
	name = other.name;
	type = other.type;
	option = other.option;
	parameters = other.parameters;
	sub_sections_by_type = other.sub_sections_by_type;
	setChldrenPointers();
	}
	return *this;
	}

	virtual ~ParserSection();

	virtual void printself(std::ostream & stream, unsigned int indent = 0) const;

	/* ---------------------------------------------------------------------- */
	/* Creation functions */
	/* ---------------------------------------------------------------------- */
	public:
	ParserParameter & addParameter(const ParserParameter & param);
	ParserSection & addSubSection(const ParserSection & section);

	protected:
	/// Clean ParserSection content
	void clean() {
	parameters.clear();
	sub_sections_by_type.clear();
	}

	private:
	void setChldrenPointers() {
	for (auto && param_pair : this->parameters) {
	param_pair.second.setParent(*this);
	}

	for (auto && sub_sect_pair : this->sub_sections_by_type) {
	sub_sect_pair.second.setParent(*this);
	}
	}

	/* ---------------------------------------------------------------------- */
	/* Accessors */
	/* ---------------------------------------------------------------------- */
	public:
	class SubSectionsRange
	: public std::pair<const_section_iterator, const_section_iterator> {
	public:
	SubSectionsRange(const const_section_iterator & first,
	const const_section_iterator & second)
	: std::pair<const_section_iterator, const_section_iterator>(first,
	second) {}
	auto begin() { return this->first; }
	auto end() { return this->second; }
	};

	/// Get begin and end iterators on subsections of certain type
	auto getSubSections(ParserType type = ParserType::_not_defined) const {
	if (type != ParserType::_not_defined) {
	auto range = sub_sections_by_type.equal_range(type);
	return SubSectionsRange(range.first, range.second);
	}
	return SubSectionsRange(sub_sections_by_type.begin(),
	sub_sections_by_type.end());
	}

	/// Get number of subsections of certain type
	Int getNbSubSections(ParserType type = ParserType::_not_defined) const {
	if (type != ParserType::_not_defined) {
	return this->sub_sections_by_type.count(type);
	}
	return this->sub_sections_by_type.size();
	}

	/// Get begin and end iterators on parameters
	auto getParameters() const {
	return std::pair<const_parameter_iterator, const_parameter_iterator>(
	parameters.begin(), parameters.end());
	}
	/* ---------------------------------------------------------------------- */
	/// Get parameter within specified context
	const ParserParameter & getParameter(
	const std::string & name,
	ParserParameterSearchCxt search_ctx = _ppsc_current_scope) const {
	Parameters::const_iterator it;
	if ((search_ctx & _ppsc_current_scope) != 0) {
	it = parameters.find(name);
	}

	if (it == parameters.end()) {
	if ((search_ctx & _ppsc_parent_scope) != 0 and
	parent_section != nullptr) {
	return parent_section->getParameter(name, search_ctx);
	}

	AKANTU_SILENT_EXCEPTION(
	"The parameter " << name
	<< " has not been found in the specified context");
	}
	return it->second;
	}

	/* ------------------------------------------------------------------------ */
	/// Get parameter within specified context, with a default value in case the
	/// parameter does not exists
	template <class T>
	T getParameter(
	const std::string & name, const T & default_value,
	ParserParameterSearchCxt search_ctx = _ppsc_current_scope) const {
	try {
	T tmp = this->getParameter(name, search_ctx);
	return tmp;
	} catch (debug::Exception &) {
	return default_value;
	}
	}

	/* ------------------------------------------------------------------------ */
	/// Check if parameter exists within specified context
	bool hasParameter(
	const std::string & name,
	ParserParameterSearchCxt search_ctx = _ppsc_current_scope) const {

	Parameters::const_iterator it;
	if ((search_ctx & _ppsc_current_scope) != 0) {
	it = parameters.find(name);
	}

	if (it == parameters.end()) {
	if ((search_ctx & _ppsc_parent_scope) != 0 and
	parent_section != nullptr) {
	return parent_section->hasParameter(name, search_ctx);
	}
	return false;
	}
	return true;
	}

	/* --------------------------------------------------------------------------
	*/
	/// Get value of given parameter in context
	template <class T>
	T getParameterValue(
	const std::string & name,
	ParserParameterSearchCxt search_ctx = _ppsc_current_scope) const {
	const ParserParameter & tmp_param = getParameter(name, search_ctx);
	T t = tmp_param;
	return t;
	}

	/* --------------------------------------------------------------------------
	*/
	/// Get section name
	std::string getName() const { return name; }
	/// Get section type
	ParserType getType() const { return type; }
	/// Get section option
	std::string getOption(const std::string & def = "") const {
	return (not option.empty()) ? option : def;
	}

	protected:
	void setParent(const ParserSection & sect) { parent_section = § }

	/* ---------------------------------------------------------------------- */
	/* Members */
	/* ---------------------------------------------------------------------- */
	private:
	/// Pointer to the parent section
	const ParserSection * parent_section{nullptr};
	/// Name of section
	std::string name;
	/// Type of section, see AKANTU_SECTION_TYPES
	ParserType type{ParserType::_not_defined};
	/// Section option
	std::string option;
	/// Map of parameters in section
	Parameters parameters;
	/// Multi-map of subsections
	SubSections sub_sections_by_type;
	};

	/* ------------------------------------------------------------------------ */
	/* Parser Class */
	/* ------------------------------------------------------------------------ */
	/// Root of parsing tree, represents the global ParserSection
	class Parser : public ParserSection {
	public:
	Parser() : ParserSection("global", ParserType::_global) {}

	void parse(const std::string & filename);

	std::string getLastParsedFile() const;

	static bool isPermissive() { return permissive_parser; }

	public:
	/// Parse real scalar
	static Real parseReal(const std::string & value,
	const ParserSection & section);
	/// Parse real vector
	static Vector<Real> parseVector(const std::string & value,
	const ParserSection & section);
	/// Parse real matrix
	static Matrix<Real> parseMatrix(const std::string & value,
	const ParserSection & section);
	/// Parse real random parameter
	static RandomParameter<Real>
	parseRandomParameter(const std::string & value,
	const ParserSection & section);

	protected:
	/// General parse function
	template <class T, class Grammar>
	static T parseType(const std::string & value, Grammar & grammar);

	protected:
	// friend class Parsable;
	static bool permissive_parser;
	std::string last_parsed_file;
	};

	inline std::ostream & operator<<(std::ostream & stream,
	const ParserParameter & _this) {
	_this.printself(stream);
	return stream;
	}

	inline std::ostream & operator<<(std::ostream & stream,
	const ParserSection & section) {
	section.printself(stream);
	return stream;
	}

	} // namespace akantu

	namespace std {
	template <> struct iterator_traits<::akantu::Parser::const_section_iterator> {
	using iterator_category = input_iterator_tag;
	using value_type = ::akantu::ParserParameter;
	using difference_type = ptrdiff_t;
	using pointer = const ::akantu::ParserParameter *;
	using reference = const ::akantu::ParserParameter &;
	};
	} // namespace std

	#include "parser_tmpl.hh"

	#endif /* AKANTU_PARSER_HH_ */

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