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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
50 #include "gromacs/utility/classhelpers.h"
55 class TextLineWrapperSettings;
59 //! \libinternal Output format for help writing.
62 eHelpOutputFormat_Console, //!< Plain text directly on the console.
63 eHelpOutputFormat_Rst, //!< reStructuredText for online manual and man pages.
64 eHelpOutputFormat_Other, //!< Used for extensions in other modules.
65 eHelpOutputFormat_NR //!< Used for the number of output formats.
69 /*! \libinternal \brief
70 * Hyperlink data for writing out help.
72 * This class is separate from HelpWriterContext to allow constructing the list
73 * of links once and reusing them across multiple help writer contexts.
74 * This is used when exporting all the help from the wrapper binary to avoid
75 * repeatedly constructing the same data structure for each help item.
77 * While the links are in principle independent of the output format, the
78 * constructor takes the output format to be able to preformat the links,
79 * avoiding repeated processing during markup substitution. Could be hidden
80 * behind the scenes in HelpWriterContext, but that would complicate the
83 * \ingroup module_onlinehelp
89 * Initializes an empty links collection for the given output format.
91 explicit HelpLinks(HelpOutputFormat format);
97 * \param[in] linkName Name of the link in input text.
98 * \param[in] targetName Hyperlink target.
99 * \param[in] displayName Text to show as the link.
101 * Any occurrence of \p linkName in the text passed to markup
102 * substitution methods in HelpWriterContext is made into a hyperlink
103 * to \p targetName if the markup format supports that.
105 void addLink(const std::string& linkName, const std::string& targetName, const std::string& displayName);
110 std::unique_ptr<Impl> impl_;
112 //! Allows the context to use the links.
113 friend class HelpWriterContext;
116 /*! \libinternal \brief
117 * Context information for writing out help.
119 * The purpose of this class is to pass information about the output format to
120 * methods that write help, and to abstract away most of the details of
121 * different output formats.
123 * The state of a context object (excluding the fact that the output file is
124 * written to) does not change after initial construction of the object.
125 * Copying creates a context objects that share state with the source.
128 * \ingroup module_onlinehelp
130 class HelpWriterContext
134 * Initializes a context with the given output writer and format.
136 * \throws std::bad_alloc if out of memory.
138 HelpWriterContext(TextWriter* writer, HelpOutputFormat format);
140 * Initializes a context with the given output writer, format and links.
142 * \throws std::bad_alloc if out of memory.
144 * A reference to \p links is stored until the HelpWriterContext
145 * is destructed. The caller is responsible for ensuring that the
146 * links object remains valid long enough.
148 HelpWriterContext(TextWriter* writer, HelpOutputFormat format, const HelpLinks* links);
149 //! Creates a copy of the context.
150 HelpWriterContext(const HelpWriterContext& other);
151 ~HelpWriterContext();
154 * Adds a string replacement for markup subsitution.
156 * \param[in] search Text to replace in input.
157 * \param[in] replace Text that each occurrence of \p search is
159 * \throws std::bad_alloc if out of memory.
162 * Improve semantics if the same \p search item is set multiple
165 void setReplacement(const std::string& search, const std::string& replace);
168 * Returns the active output format.
172 HelpOutputFormat outputFormat() const;
174 * Returns the raw writer for writing the help.
176 * Using this writer directly should be avoided, as it requires one to
177 * have different code for each output format.
178 * Using other methods in this class should be preferred.
182 TextWriter& outputFile() const;
185 * Creates a subsection in the output help.
187 * \param[in] title Title for the subsection.
188 * \throws std::bad_alloc if out of memory.
189 * \throws FileIOError on any I/O error.
191 * Writes \p title using writeTitle() and makes any further
192 * writeTitle() calls write headings one level deeper.
194 * Typical use for writing a subsection is to create a copy of the
195 * context for the parent section, and then call enterSubSection() on
197 * The whole subsection should be written out using the returned
198 * context before calling any further methods in the parent context.
200 * This method is only necessary if the subsection will contain further
201 * subsections. If there is only one level of subsections, it is
202 * possible to use writeTitle() directly.
204 void enterSubSection(const std::string& title);
207 * Substitutes markup used in help text and wraps lines.
209 * \param[in] settings Line wrapper settings.
210 * \param[in] text Text to substitute.
211 * \returns \p text with markup substituted and wrapped.
212 * \throws std::bad_alloc if out of memory.
214 * \see TextLineWrapper::wrapToString()
216 std::string substituteMarkupAndWrapToString(const TextLineWrapperSettings& settings,
217 const std::string& text) const;
219 * Substitutes markup used in help text and wraps lines.
221 * \param[in] settings Line wrapper settings.
222 * \param[in] text Text to substitute.
223 * \returns \p text with markup substituted and wrapped as a list of
225 * \throws std::bad_alloc if out of memory.
227 * \see TextLineWrapper::wrapToVector()
229 std::vector<std::string> substituteMarkupAndWrapToVector(const TextLineWrapperSettings& settings,
230 const std::string& text) const;
232 * Writes a title for the current help topic.
234 * \param[in] title Title to write.
235 * \throws std::bad_alloc if out of memory.
236 * \throws FileIOError on any I/O error.
238 void writeTitle(const std::string& title) const;
240 * Writes a formatted text block into the output.
242 * \param[in] text Text to format.
243 * \throws std::bad_alloc if out of memory.
244 * \throws FileIOError on any I/O error.
246 * Convenience function that calls substituteMarkupAndWrapToString()
247 * and writes the result directly to the output file.
249 void writeTextBlock(const std::string& text) const;
251 * Ensures a paragraph break (empty line) in the output.
253 * Calls at the beginning and end of output do not produce extra empty
254 * lines, and consencutive calls only result in a single empty line.
255 * This allows calling the method before and after all output that
256 * needs to appear separated as empty lines.
258 void paragraphBreak() const;
260 * Starts writing a list of options.
262 * Prints any necessary headers for a list of options formatted with
265 void writeOptionListStart() const;
267 * Writes an entry for a single option into the output.
269 * \param[in] name Name of the option.
270 * \param[in] value Placeholder for option value.
271 * \param[in] defaultValue Default value for the option.
272 * \param[in] info Additional (brief) info/attributes for the
274 * \param[in] description Full description of the option.
276 void writeOptionItem(const std::string& name,
277 const std::string& value,
278 const std::string& defaultValue,
279 const std::string& info,
280 const std::string& description) const;
282 * Finishes writing a list of options.
284 * Prints any necessary footers for a list of options formatted with
287 void writeOptionListEnd() const;
293 * Constructs a context object with the given implementation class.
295 * \param[in] impl Implementation object.
299 explicit HelpWriterContext(Impl* impl);
301 std::unique_ptr<Impl> impl_;
303 GMX_DISALLOW_ASSIGN(HelpWriterContext);