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35 /*! \libinternal \file
37 * Declares gmx::HelpWriterContext.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
41 * \ingroup module_onlinehelp
43 #ifndef GMX_ONLINEHELP_HELPWRITERCONTEXT_H
44 #define GMX_ONLINEHELP_HELPWRITERCONTEXT_H
49 #include "gromacs/utility/classhelpers.h"
54 class TextLineWrapperSettings;
58 //! \libinternal Output format for help writing.
61 eHelpOutputFormat_Console, //!< Plain text directly on the console.
62 eHelpOutputFormat_Rst, //!< reStructuredText for online manual and man pages.
63 eHelpOutputFormat_Other, //!< Used for extensions in other modules.
64 eHelpOutputFormat_NR //!< Used for the number of output formats.
68 /*! \libinternal \brief
69 * Hyperlink data for writing out help.
71 * This class is separate from HelpWriterContext to allow constructing the list
72 * of links once and reusing them across multiple help writer contexts.
73 * This is used when exporting all the help from the wrapper binary to avoid
74 * repeatedly constructing the same data structure for each help item.
76 * While the links are in principle independent of the output format, the
77 * constructor takes the output format to be able to preformat the links,
78 * avoiding repeated processing during markup substitution. Could be hidden
79 * behind the scenes in HelpWriterContext, but that would complicate the
82 * \ingroup module_onlinehelp
88 * Initializes an empty links collection for the given output format.
90 explicit HelpLinks(HelpOutputFormat format);
96 * \param[in] linkName Name of the link in input text.
97 * \param[in] targetName Hyperlink target.
98 * \param[in] displayName Text to show as the link.
100 * Any occurrence of \p linkName in the text passed to markup
101 * substitution methods in HelpWriterContext is made into a hyperlink
102 * to \p targetName if the markup format supports that.
104 void addLink(const std::string& linkName, const std::string& targetName, const std::string& displayName);
109 PrivateImplPointer<Impl> impl_;
111 //! Allows the context to use the links.
112 friend class HelpWriterContext;
115 /*! \libinternal \brief
116 * Context information for writing out help.
118 * The purpose of this class is to pass information about the output format to
119 * methods that write help, and to abstract away most of the details of
120 * different output formats.
122 * The state of a context object (excluding the fact that the output file is
123 * written to) does not change after initial construction of the object.
124 * Copying creates a context objects that share state with the source.
127 * \ingroup module_onlinehelp
129 class HelpWriterContext
133 * Initializes a context with the given output writer and format.
135 * \throws std::bad_alloc if out of memory.
137 HelpWriterContext(TextWriter* writer, HelpOutputFormat format);
139 * Initializes a context with the given output writer, format and links.
141 * \throws std::bad_alloc if out of memory.
143 * A reference to \p links is stored until the HelpWriterContext
144 * is destructed. The caller is responsible for ensuring that the
145 * links object remains valid long enough.
147 HelpWriterContext(TextWriter* writer, HelpOutputFormat format, const HelpLinks* links);
148 //! Creates a copy of the context.
149 HelpWriterContext(const HelpWriterContext& other);
150 ~HelpWriterContext();
153 * Adds a string replacement for markup subsitution.
155 * \param[in] search Text to replace in input.
156 * \param[in] replace Text that each occurrence of \p search is
158 * \throws std::bad_alloc if out of memory.
161 * Improve semantics if the same \p search item is set multiple
164 void setReplacement(const std::string& search, const std::string& replace);
167 * Returns the active output format.
171 HelpOutputFormat outputFormat() const;
173 * Returns the raw writer for writing the help.
175 * Using this writer directly should be avoided, as it requires one to
176 * have different code for each output format.
177 * Using other methods in this class should be preferred.
181 TextWriter& outputFile() const;
184 * Creates a subsection in the output help.
186 * \param[in] title Title for the subsection.
187 * \throws std::bad_alloc if out of memory.
188 * \throws FileIOError on any I/O error.
190 * Writes \p title using writeTitle() and makes any further
191 * writeTitle() calls write headings one level deeper.
193 * Typical use for writing a subsection is to create a copy of the
194 * context for the parent section, and then call enterSubSection() on
196 * The whole subsection should be written out using the returned
197 * context before calling any further methods in the parent context.
199 * This method is only necessary if the subsection will contain further
200 * subsections. If there is only one level of subsections, it is
201 * possible to use writeTitle() directly.
203 void enterSubSection(const std::string& title);
206 * Substitutes markup used in help text and wraps lines.
208 * \param[in] settings Line wrapper settings.
209 * \param[in] text Text to substitute.
210 * \returns \p text with markup substituted and wrapped.
211 * \throws std::bad_alloc if out of memory.
213 * \see TextLineWrapper::wrapToString()
215 std::string substituteMarkupAndWrapToString(const TextLineWrapperSettings& settings,
216 const std::string& text) const;
218 * Substitutes markup used in help text and wraps lines.
220 * \param[in] settings Line wrapper settings.
221 * \param[in] text Text to substitute.
222 * \returns \p text with markup substituted and wrapped as a list of
224 * \throws std::bad_alloc if out of memory.
226 * \see TextLineWrapper::wrapToVector()
228 std::vector<std::string> substituteMarkupAndWrapToVector(const TextLineWrapperSettings& settings,
229 const std::string& text) const;
231 * Writes a title for the current help topic.
233 * \param[in] title Title to write.
234 * \throws std::bad_alloc if out of memory.
235 * \throws FileIOError on any I/O error.
237 void writeTitle(const std::string& title) const;
239 * Writes a formatted text block into the output.
241 * \param[in] text Text to format.
242 * \throws std::bad_alloc if out of memory.
243 * \throws FileIOError on any I/O error.
245 * Convenience function that calls substituteMarkupAndWrapToString()
246 * and writes the result directly to the output file.
248 void writeTextBlock(const std::string& text) const;
250 * Ensures a paragraph break (empty line) in the output.
252 * Calls at the beginning and end of output do not produce extra empty
253 * lines, and consencutive calls only result in a single empty line.
254 * This allows calling the method before and after all output that
255 * needs to appear separated as empty lines.
257 void paragraphBreak() const;
259 * Starts writing a list of options.
261 * Prints any necessary headers for a list of options formatted with
264 void writeOptionListStart() const;
266 * Writes an entry for a single option into the output.
268 * \param[in] name Name of the option.
269 * \param[in] value Placeholder for option value.
270 * \param[in] defaultValue Default value for the option.
271 * \param[in] info Additional (brief) info/attributes for the
273 * \param[in] description Full description of the option.
275 void writeOptionItem(const std::string& name,
276 const std::string& value,
277 const std::string& defaultValue,
278 const std::string& info,
279 const std::string& description) const;
281 * Finishes writing a list of options.
283 * Prints any necessary footers for a list of options formatted with
286 void writeOptionListEnd() const;
292 * Constructs a context object with the given implementation class.
294 * \param[in] impl Implementation object.
298 explicit HelpWriterContext(Impl* impl);
300 PrivateImplPointer<Impl> impl_;
302 GMX_DISALLOW_ASSIGN(HelpWriterContext);