mirror of
https://github.com/Gnucash/gnucash.git
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b4b8431984
for certain reports. Those reports being ones using complex options, apparently because the callbacks weren't protected from Guile's garbage collector. So replace the anyway ugly hack of a void* with a std::any wrapping a class holding a std::unique_ptr with a custom deleter. The constructor calls scm_gc_protect_object on the SCM containing the callback and the custom deleter calls scm_gc_unprotect_object. The copy constructor, required for std::any, makes a new std::unique_ptr and calls scm_gc_protect_object again ensuring that the protect and unprotect calls are symmetrical. Meanwhile std::any hides the Guile dependency from all the classes that don't need to know about it. The only ugliness is that there's no good place to put a common implementation of SCNCallbackWrapper so it's repeated in gnc-optiondb.i and dialog-options.cpp.
267 lines
9.6 KiB
C++
267 lines
9.6 KiB
C++
/********************************************************************\
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* gnc-option.hpp -- Application options system *
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* Copyright (C) 2020 John Ralls <jralls@ceridwen.us> *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License as *
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* published by the Free Software Foundation; either version 2 of *
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* the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License*
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* along with this program; if not, contact: *
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* *
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* Free Software Foundation Voice: +1-617-542-5942 *
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* 51 Franklin Street, Fifth Floor Fax: +1-617-542-2652 *
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* Boston, MA 02110-1301, USA gnu@gnu.org *
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* *
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\********************************************************************/
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/** @addtogroup Engine
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@{ */
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/** @addtogroup Options
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@{ */
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/** @file gnc-option.hpp
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@brief C++ Public interface for individual options.
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@author Copyright 2020-2021 John Ralls <jralls@ceridwen.us>
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*/
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#ifndef GNC_OPTION_HPP_
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#define GNC_OPTION_HPP_
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#include <glib.h>
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#include <any>
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#include <string>
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#include <iostream>
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#include <iomanip>
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#include <type_traits>
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#include <variant>
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#include <memory>
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#include <tuple>
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#include "gnc-option-ui.hpp"
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#include "gnc-option-date.hpp"
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#include "guid.hpp"
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struct OptionClassifier;
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class GncOptionUIItem;
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using GncOptionUIItemPtr = std::unique_ptr<GncOptionUIItem>;
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#ifndef SWIG //SWIG pulls in GncOwner from swig-engine.
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struct _gncOwner;
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using GncOwner = _gncOwner;
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struct _QofQuery;
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using QofQuery = _QofQuery;
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#endif
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struct QofInstance_s;
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using QofInstance = QofInstance_s;
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template <typename ValueType> class GncOptionValue;
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class GncOptionGncOwnerValue;
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class GncOptionQofInstanceValue;
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class GncOptionAccountListValue;
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class GncOptionAccountSelValue;
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class GncOptionMultichoiceValue;
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template <typename ValueType> class GncOptionRangeValue;
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class GncOptionCommodityValue;
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class GncOptionDateValue;
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using GncOptionReportPlacement = std::tuple<uint32_t, uint32_t, uint32_t>;
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using GncOptionReportPlacementVec = std::vector<GncOptionReportPlacement>;
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template <typename T>
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struct is_OptionClassifier
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{
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static constexpr bool value =
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std::is_base_of_v<OptionClassifier, std::decay_t<T>>;
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};
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template <typename T> inline constexpr bool
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is_OptionClassifier_v = is_OptionClassifier<T>::value;
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template <typename T, typename U>
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struct is_same_decayed
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{
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static constexpr bool value = std::is_same_v<std::decay_t<T>,
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std::decay_t<U>>;
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};
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template <typename T, typename U> inline constexpr bool
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is_same_decayed_v = is_same_decayed<T, U>::value;
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template <typename T>
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struct is_RangeValue
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{
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static constexpr bool value =
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(is_same_decayed_v<T, GncOptionRangeValue<int>> ||
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is_same_decayed_v<T, GncOptionRangeValue<double>>);
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};
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template <typename T> inline constexpr bool
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is_RangeValue_v = is_RangeValue<T>::value;
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using GncOptionVariant = std::variant<GncOptionValue<std::string>,
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GncOptionValue<bool>,
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GncOptionValue<int64_t>,
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GncOptionQofInstanceValue,
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GncOptionGncOwnerValue,
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GncOptionValue<const QofQuery*>,
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GncOptionValue<GncOptionReportPlacementVec>,
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GncOptionAccountListValue,
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GncOptionAccountSelValue,
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GncOptionMultichoiceValue,
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GncOptionRangeValue<int>,
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GncOptionRangeValue<double>,
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GncOptionCommodityValue,
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GncOptionDateValue>;
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using GncOptionVariantPtr = std::unique_ptr<GncOptionVariant>;
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enum class GncOptionMultichoiceKeyType
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{
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SYMBOL,
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STRING,
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NUMBER,
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};
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/** @class GncOption
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* @brief Represents the public interface for an option.
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* Polymorphism is provided by a std::variant member containing GncOptionValue
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* types.
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*/
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class GncOption
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{
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public:
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template <typename OptionType,
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typename std::enable_if_t<is_OptionClassifier_v<OptionType>,
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int> = 0>
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GncOption(OptionType option) :
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m_option{std::make_unique<GncOptionVariant>(option)} {}
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template <typename ValueType,
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typename std::enable_if_t<!is_OptionClassifier_v<ValueType>,
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int> = 0>
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GncOption(const char* section, const char* name,
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const char* key, const char* doc_string,
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ValueType value,
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GncOptionUIType ui_type = GncOptionUIType::INTERNAL);
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template <typename ValueType> void set_value(ValueType value);
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template <typename ValueType> void set_default_value(ValueType value);
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template <typename ValueType> ValueType get_default_value() const;
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template <typename ValueType> ValueType get_value() const;
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void reset_default_value();
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const std::string& get_section() const;
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const std::string& get_name() const;
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const std::string& get_key() const;
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const std::string& get_docstring() const;
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void set_ui_item(GncOptionUIItemPtr&& ui_elem);
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const GncOptionUIType get_ui_type() const;
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void set_ui_item_selectable(bool) const noexcept;
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GncOptionUIItem* const get_ui_item() const;
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void set_ui_item_from_option();
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void set_option_from_ui_item();
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void make_internal();
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bool is_internal();
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bool is_changed() const noexcept;
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/** @returns false unless m_option contains a GncOptionMultiselectValue or
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* GncOptionAccountListValue for which multiple selections have been enabled.
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*/
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bool is_multiselect() const noexcept;
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/** Implemented only for GncOptionNumericRange */
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template <typename ValueType> void get_limits(ValueType&, ValueType&,
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ValueType&) const noexcept;
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/** Not implemented for GncOptionValue. */
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template <typename ValueType> bool validate(ValueType value) const;
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/** Implemented only for GncOptionMultiselectValue. */
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uint16_t num_permissible_values() const;
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/** Implemented only for GncOptionMultiselectValue. */
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uint16_t permissible_value_index(const char* value) const;
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/** Implemented only for GncOptionMultiselectValue. */
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const char* permissible_value(uint16_t index) const;
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/** Implemented only for GncOptionMultiselectValue. */
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const char* permissible_value_name(uint16_t index) const;
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/** Implemented only for GncOptionAccountListValue. */
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GList* account_type_list() const noexcept;
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bool is_alternate() const noexcept;
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void set_alternate(bool) noexcept;
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/** Get a string suitable for storage representing the option's value.
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* @return a std::string
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*/
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std::string serialize() const;
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/** Set the option's value from a character sequence.
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* @param str: The character sequence representing the value
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* @return true if the value was set, false otherwise.
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*/
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bool deserialize(const std::string& str);
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/** Set the option's value from an input stream
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* @param iss: An input stream reference.
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* @return the stream reference for chaining.
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*/
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std::istream& in_stream(std::istream& iss);
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friend GncOptionVariant& swig_get_option(GncOption*);
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void set_widget_changed (std::any cb) { m_widget_changed = cb; }
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std::any& get_widget_changed () { return m_widget_changed; }
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private:
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inline static const std::string c_empty_string{""};
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GncOptionVariantPtr m_option;
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GncOptionUIItemPtr m_ui_item{nullptr};
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std::any m_widget_changed{};
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};
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inline bool
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operator<(const GncOption& right, const GncOption& left)
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{
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return right.get_key() < left.get_key();
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}
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inline std::ostream&
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operator<<(std::ostream& oss, const GncOption& opt)
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{
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oss << opt.serialize();
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return oss;
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}
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inline std::istream&
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operator>>(std::istream& iss, GncOption& opt)
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{
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return opt.in_stream(iss);
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}
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inline std::ostream&
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output_color_value(std::ostream& oss, const std::string& value)
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{
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oss << "'(";
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oss << std::fixed << std::showpoint << std::setprecision(1);
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auto len{value.length() > 8 ? 8 : value.length()};
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for (size_t i{}; i < len; i += 2)
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{
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oss << static_cast<float>(stoi(value.substr(i, 2), nullptr, 16));
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if (i < 6)
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oss << " ";
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}
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if (len < 8)
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oss << 256.0;
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oss << ")";
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return oss;
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}
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/**
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* Free function wrapping GncOption's constructor. The type of GncOptionValue to
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* create is determined from the UI type. Some GncOptionValue types require more
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* parameters for their constructors and can't be created with this function.
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*/
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template<typename ValueType> GncOption*
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gnc_make_option(const char* section, const char* name,
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const char* key, const char* doc_string,
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ValueType value, GncOptionUIType ui_type)
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{
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return new GncOption(section, name, key, doc_string, value, ui_type);
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}
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#endif //GNC_OPTION_HPP_
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/** @}
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@} */
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