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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 "../utility/common.h"
55 class TextLineWrapperSettings;
58 //! \libinternal Output format for help writing.
61 eHelpOutputFormat_Console, //!< Plain text directly on the console.
62 eHelpOutputFormat_Man, //!< Man page.
63 eHelpOutputFormat_Html, //!< Html output for online manual.
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,
106 const std::string &targetName,
107 const std::string &displayName);
112 PrivateImplPointer<Impl> impl_;
114 //! Allows the context to use the links.
115 friend class HelpWriterContext;
118 /*! \libinternal \brief
119 * Context information for writing out help.
121 * The purpose of this class is to pass information about the output format to
122 * methods that write help, and to abstract away most of the details of
123 * different output formats.
125 * The state of a context object (excluding the fact that the output file is
126 * written to) does not change after initial construction of the object.
127 * Copying creates a context object that shares state with the source.
129 * TODO: This class will need additional work as part of Redmine issue #969.
132 * \ingroup module_onlinehelp
134 class HelpWriterContext
138 * Initializes a context with the given output file and format.
140 * \throws std::bad_alloc if out of memory.
142 HelpWriterContext(File *file, HelpOutputFormat format);
144 * Initializes a context with the given output file, format and links.
146 * \throws std::bad_alloc if out of memory.
148 * A reference to \p links is stored until the HelpWriterContext
149 * is destructed. The caller is responsible for ensuring that the
150 * links object remains valid long enough.
152 HelpWriterContext(File *file, HelpOutputFormat format,
153 const HelpLinks *links);
154 //! Creates a copy of the context.
155 HelpWriterContext(const HelpWriterContext &other);
156 ~HelpWriterContext();
159 * Adds a string replacement for markup subsitution.
161 * \param[in] search Text to replace in input.
162 * \param[in] replace Text that each occurrence of \p search is
164 * \throws std::bad_alloc if out of memory.
167 * Improve semantics if the same \p search item is set multiple
170 void setReplacement(const std::string &search,
171 const std::string &replace);
174 * Returns the active output format.
178 HelpOutputFormat outputFormat() const;
180 * Returns the raw output file for writing the help.
182 * Using this file directly should be avoided, as it requires one to
183 * have different code for each output format.
184 * Using other methods in this class should be preferred.
188 File &outputFile() const;
191 * Substitutes markup used in help text and wraps lines.
193 * \param[in] settings Line wrapper settings.
194 * \param[in] text Text to substitute.
195 * \returns \p text with markup substituted and wrapped.
196 * \throws std::bad_alloc if out of memory.
198 * \see TextLineWrapper::wrapToString()
201 substituteMarkupAndWrapToString(const TextLineWrapperSettings &settings,
202 const std::string &text) const;
204 * Substitutes markup used in help text and wraps lines.
206 * \param[in] settings Line wrapper settings.
207 * \param[in] text Text to substitute.
208 * \returns \p text with markup substituted and wrapped as a list of
210 * \throws std::bad_alloc if out of memory.
212 * \see TextLineWrapper::wrapToVector()
214 std::vector<std::string>
215 substituteMarkupAndWrapToVector(const TextLineWrapperSettings &settings,
216 const std::string &text) const;
218 * Writes a title for the current help topic.
220 * \param[in] title Title to write.
221 * \throws std::bad_alloc if out of memory.
222 * \throws FileIOError on any I/O error.
224 void writeTitle(const std::string &title) const;
226 * Writes a formatted text block into the output.
228 * \param[in] text Text to format.
229 * \throws std::bad_alloc if out of memory.
230 * \throws FileIOError on any I/O error.
232 * Convenience function that calls substituteMarkupAndWrapToString()
233 * and writes the result directly to the output file.
235 void writeTextBlock(const std::string &text) const;
237 * Starts writing a list of options.
239 * Prints any necessary headers for a list of options formatted with
242 void writeOptionListStart() const;
244 * Writes an entry for a single option into the output.
246 * \param[in] name Name of the option.
247 * \param[in] args Placeholder for values and other information about
248 * the option (placed after \p name).
249 * \param[in] description Full description of the option.
251 void writeOptionItem(const std::string &name, const std::string &args,
252 const std::string &description) const;
254 * Finishes writing a list of options.
256 * Prints any necessary footers for a list of options formatted with
259 void writeOptionListEnd() const;
265 * Constructs a context object with the given implementation class.
267 * \param[in] impl Implementation object.
271 explicit HelpWriterContext(Impl *impl);
273 PrivateImplPointer<Impl> impl_;
275 GMX_DISALLOW_ASSIGN(HelpWriterContext);