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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
,
105 const std::string
&targetName
,
106 const std::string
&displayName
);
111 PrivateImplPointer
<Impl
> impl_
;
113 //! Allows the context to use the links.
114 friend class HelpWriterContext
;
117 /*! \libinternal \brief
118 * Context information for writing out help.
120 * The purpose of this class is to pass information about the output format to
121 * methods that write help, and to abstract away most of the details of
122 * different output formats.
124 * The state of a context object (excluding the fact that the output file is
125 * written to) does not change after initial construction of the object.
126 * Copying creates a context objects that share state with the source.
129 * \ingroup module_onlinehelp
131 class HelpWriterContext
135 * Initializes a context with the given output writer and format.
137 * \throws std::bad_alloc if out of memory.
139 HelpWriterContext(TextWriter
*writer
, HelpOutputFormat format
);
141 * Initializes a context with the given output writer, format and links.
143 * \throws std::bad_alloc if out of memory.
145 * A reference to \p links is stored until the HelpWriterContext
146 * is destructed. The caller is responsible for ensuring that the
147 * links object remains valid long enough.
149 HelpWriterContext(TextWriter
*writer
, HelpOutputFormat format
,
150 const HelpLinks
*links
);
151 //! Creates a copy of the context.
152 HelpWriterContext(const HelpWriterContext
&other
);
153 ~HelpWriterContext();
156 * Adds a string replacement for markup subsitution.
158 * \param[in] search Text to replace in input.
159 * \param[in] replace Text that each occurrence of \p search is
161 * \throws std::bad_alloc if out of memory.
164 * Improve semantics if the same \p search item is set multiple
167 void setReplacement(const std::string
&search
,
168 const std::string
&replace
);
171 * Returns the active output format.
175 HelpOutputFormat
outputFormat() const;
177 * Returns the raw writer for writing the help.
179 * Using this writer directly should be avoided, as it requires one to
180 * have different code for each output format.
181 * Using other methods in this class should be preferred.
185 TextWriter
&outputFile() const;
188 * Creates a subsection in the output help.
190 * \param[in] title Title for the subsection.
191 * \throws std::bad_alloc if out of memory.
192 * \throws FileIOError on any I/O error.
194 * Writes \p title using writeTitle() and makes any further
195 * writeTitle() calls write headings one level deeper.
197 * Typical use for writing a subsection is to create a copy of the
198 * context for the parent section, and then call enterSubSection() on
200 * The whole subsection should be written out using the returned
201 * context before calling any further methods in the parent context.
203 * This method is only necessary if the subsection will contain further
204 * subsections. If there is only one level of subsections, it is
205 * possible to use writeTitle() directly.
207 void enterSubSection(const std::string
&title
);
210 * Substitutes markup used in help text and wraps lines.
212 * \param[in] settings Line wrapper settings.
213 * \param[in] text Text to substitute.
214 * \returns \p text with markup substituted and wrapped.
215 * \throws std::bad_alloc if out of memory.
217 * \see TextLineWrapper::wrapToString()
220 substituteMarkupAndWrapToString(const TextLineWrapperSettings
&settings
,
221 const std::string
&text
) const;
223 * Substitutes markup used in help text and wraps lines.
225 * \param[in] settings Line wrapper settings.
226 * \param[in] text Text to substitute.
227 * \returns \p text with markup substituted and wrapped as a list of
229 * \throws std::bad_alloc if out of memory.
231 * \see TextLineWrapper::wrapToVector()
233 std::vector
<std::string
>
234 substituteMarkupAndWrapToVector(const TextLineWrapperSettings
&settings
,
235 const std::string
&text
) const;
237 * Writes a title for the current help topic.
239 * \param[in] title Title to write.
240 * \throws std::bad_alloc if out of memory.
241 * \throws FileIOError on any I/O error.
243 void writeTitle(const std::string
&title
) const;
245 * Writes a formatted text block into the output.
247 * \param[in] text Text to format.
248 * \throws std::bad_alloc if out of memory.
249 * \throws FileIOError on any I/O error.
251 * Convenience function that calls substituteMarkupAndWrapToString()
252 * and writes the result directly to the output file.
254 void writeTextBlock(const std::string
&text
) const;
256 * Ensures a paragraph break (empty line) in the output.
258 * Calls at the beginning and end of output do not produce extra empty
259 * lines, and consencutive calls only result in a single empty line.
260 * This allows calling the method before and after all output that
261 * needs to appear separated as empty lines.
263 void paragraphBreak() const;
265 * Starts writing a list of options.
267 * Prints any necessary headers for a list of options formatted with
270 void writeOptionListStart() const;
272 * Writes an entry for a single option into the output.
274 * \param[in] name Name of the option.
275 * \param[in] value Placeholder for option value.
276 * \param[in] defaultValue Default value for the option.
277 * \param[in] info Additional (brief) info/attributes for the
279 * \param[in] description Full description of the option.
281 void writeOptionItem(
282 const std::string
&name
, const std::string
&value
,
283 const std::string
&defaultValue
, const std::string
&info
,
284 const std::string
&description
) const;
286 * Finishes writing a list of options.
288 * Prints any necessary footers for a list of options formatted with
291 void writeOptionListEnd() const;
297 * Constructs a context object with the given implementation class.
299 * \param[in] impl Implementation object.
303 explicit HelpWriterContext(Impl
*impl
);
305 PrivateImplPointer
<Impl
> impl_
;
307 GMX_DISALLOW_ASSIGN(HelpWriterContext
);