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35 /*! \libinternal \file
37 * Declares helper classes and functions for implementing
38 * gmx::HelpTopicInterface.
40 * \author Teemu Murtola <teemu.murtola@gmail.com>
42 * \ingroup module_onlinehelp
44 #ifndef GMX_ONLINEHELP_HELPTOPIC_H
45 #define GMX_ONLINEHELP_HELPTOPIC_H
47 #include "../utility/common.h"
48 #include "../utility/stringutil.h"
49 #include "../utility/uniqueptr.h"
51 #include "helptopicinterface.h"
57 /*! \libinternal \brief
58 * Helper for writing simple help text.
60 * \param[in] context Context for writing the help.
61 * \param[in] topic Topic to write the help for (used for title).
62 * \param[in] text Text to write for the topic.
63 * \throws std::bad_alloc if out of memory.
64 * \throws FileIOError on any I/O error.
66 * Formats basic help by writing a title (obtained from \p topic), followed by
67 * \p text with markup substituted and lines properly wrapped.
71 void writeBasicHelpTopic(const HelpWriterContext &context,
72 const HelpTopicInterface &topic,
73 const std::string &text);
76 /*! \libinternal \brief
77 * Abstract base class for help topics that have simple text and no subtopics.
79 * This class implements subtopic-related methods from HelpTopicInterface such
80 * that there are no subtopics. writeHelp() is also implemented such that it
81 * uses writeBasicHelpTopic() to write out the text returned by a new virtual
84 * \see SimpleHelpTopic
87 * \ingroup module_onlinehelp
89 class AbstractSimpleHelpTopic : public HelpTopicInterface
92 virtual const char *name() const = 0;
93 virtual const char *title() const = 0;
95 virtual bool hasSubTopics() const;
96 virtual const HelpTopicInterface *findSubTopic(const char *name) const;
98 virtual void writeHelp(const HelpWriterContext &context) const;
102 * Returns the help text for this topic.
104 * writeHelp() calls this method to obtain the actual text to format
105 * for the topic. Markup substitution etc. is done automatically by
108 virtual std::string helpText() const = 0;
111 /*! \libinternal \brief
112 * Abstract base class for help topics that have simple text and subtopics.
114 * This class implements an internal container for subtopics and provides
115 * public methods for adding subtopics (as HelpTopicInterface objects).
116 * Subtopic-related methods from HelpTopicInterface are implemented to access
117 * the internal container. writeHelp() is also implemented such that it
118 * uses writeBasicHelpTopic() to write out the text returned by a new virtual
119 * method helpText(), and a list of subtopics is written after the actual text.
121 * \see CompositeHelpTopic
124 * \ingroup module_onlinehelp
126 class AbstractCompositeHelpTopic : public HelpTopicInterface
129 AbstractCompositeHelpTopic();
130 virtual ~AbstractCompositeHelpTopic();
132 virtual const char *name() const = 0;
133 virtual const char *title() const = 0;
135 virtual bool hasSubTopics() const;
136 virtual const HelpTopicInterface *findSubTopic(const char *name) const;
138 virtual void writeHelp(const HelpWriterContext &context) const;
141 * Adds a given topic as a subtopic of this topic.
143 * \param topic Topis to add.
144 * \throws std::bad_alloc if out of memory.
146 * This topic takes ownership of the object.
148 * \see registerSubTopic()
150 void addSubTopic(HelpTopicPointer topic);
152 * Registers a subtopic of a certain type to this topic.
154 * \tparam Topic Type of topic to register.
155 * \throws std::bad_alloc if out of memory.
157 * \p Topic must be default-constructible and implement
158 * HelpTopicInterface.
160 * This method is provided as a convenient alternative to addSubTopic()
161 * for cases where each topic is implemented by a different type
162 * (which is a common case outside unit tests).
164 template <class Topic>
165 void registerSubTopic()
167 addSubTopic(HelpTopicPointer(new Topic));
171 //! \copydoc gmx::AbstractSimpleHelpTopic::helpText()
172 virtual std::string helpText() const = 0;
175 * Writes the list of subtopics.
177 * \param[in] context Context for writing the help.
178 * \param[in] title Title for the written list.
179 * \returns true if anything was printed.
180 * \throws std::bad_alloc if out of memory.
181 * \throws FileIOError on any I/O error.
183 * Subtopics with empty titles are skipped from the list.
184 * If there would be no subtopics in the list, \p title is not printed
187 * This method is provided for cases where helpText() does not provide
188 * the needed flexibility and the derived class needs to override
189 * writeHelp(). This method can then be called to print the same
190 * subtopic list that is printed by the default writeHelp()
193 bool writeSubTopicList(const HelpWriterContext &context,
194 const std::string &title) const;
199 PrivateImplPointer<Impl> impl_;
203 /*! \libinternal \brief
204 * Smart pointer type to manage a AbstractCompositeHelpTopic object.
208 typedef gmx_unique_ptr<AbstractCompositeHelpTopic>::type
209 CompositeHelpTopicPointer;
212 /*! \libinternal \brief
213 * Template for simple implementation of AbstractSimpleHelpTopic.
215 * \tparam HelpText Struct that defines the data for the topic.
217 * \p HelpText should have public static members \c "const char name[]",
218 * \c "const char title[]" and \c "const char *const text[]".
222 struct ExampleHelpText
224 static const char name[];
225 static const char title[];
226 static const char *const text[];
229 const char ExampleHelpText::name[] = "example";
230 const char ExampleHelpText::title[] =
232 const char *const ExampleHelpText::text[] = {
233 "Text for the topic.",
234 "More text for the topic."
237 typedef SimpleHelpTopic<ExampleHelpText> ExampleHelpTopic;
241 * \ingroup module_onlinehelp
243 template <class HelpText>
244 class SimpleHelpTopic : public AbstractSimpleHelpTopic
247 virtual const char *name() const
249 return HelpText::name;
251 virtual const char *title() const
253 return HelpText::title;
257 virtual std::string helpText() const
259 return concatenateStrings(HelpText::text);
263 /*! \libinternal \brief
264 * Template for simple implementation of AbstractCompositeHelpTopic.
266 * \tparam HelpText Struct that defines the data for the topic.
268 * Used similarly to SimpleHelpTopic.
269 * \p HelpText should satisfy the same criteria as for SimpleHelpTopic.
271 * \see SimpleHelpTopic
274 * \ingroup module_onlinehelp
276 template <class HelpText>
277 class CompositeHelpTopic : public AbstractCompositeHelpTopic
280 virtual const char *name() const
282 return HelpText::name;
284 virtual const char *title() const
286 return HelpText::title;
290 virtual std::string helpText() const
292 return concatenateStrings(HelpText::text);