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36 /*! \libinternal \file
38 * Declares gmx::OptionsAssigner.
40 * This header is only needed when implementing option parsers.
42 * \author Teemu Murtola <teemu.murtola@gmail.com>
44 * \ingroup module_options
46 #ifndef GMX_OPTIONS_OPTIONSASSIGNER_H
47 #define GMX_OPTIONS_OPTIONSASSIGNER_H
58 /*! \libinternal \brief
59 * Decorator class for assigning values to Options.
61 * This class extends the interface of an Options object by providing methods
62 * to set values for options. It also keeps track of necessary state variables
63 * to assign values to options in subsections within the Options object.
64 * Typical use (without error handling):
66 gmx::Options options("name", "Title");
69 gmx::OptionsAssigner assigner(&options);
71 assigner.startOption("opt1");
72 assigner.appendValue("3");
73 assigner.finishOption();
74 assigner.startSection("section");
75 assigner.startOption("opt2"); // Now in the subsection
76 assigner.appendValue("yes");
77 assigner.finishOption();
78 assigner.finishSection()
79 assigner.startOption("opt3"); // Again in the main options
80 assigner.appendValue("2");
81 assigner.finishOption();
86 * \ingroup module_options
92 * Creates an object that assigns to the given object.
94 explicit OptionsAssigner(Options* options);
98 * Sets the assigner to recognize boolean options with a "no" prefix.
100 * With this option set, \c startOption("noname") is interpreted as
101 * \c startOption("name") followed by \c appendValue("no"), if there is
102 * no option by the name "noname", but there is a boolean option with
105 * By default, the prefix is not recognized.
107 * Can be set or cleared at any time, and will have effect on all
108 * subsequent calls of startOption().
112 void setAcceptBooleanNoPrefix(bool bEnabled);
115 * Starts assigning values.
121 * Starts assigning values to options in a subsection.
123 * \param[in] name Name of the subsection to start assigning to.
124 * \throws InvalidInputError if such a subsection is not found.
126 * Strong exception safety guarantee.
128 void startSection(const char* name);
130 * Starts assigning values for an option.
132 * \param[in] name Name of the option to start assigning to.
133 * \throws InvalidInputError if such an option is not found, or if the
134 * option is specified more than once but doesn't support it.
136 void startOption(const char* name);
138 * Starts assigning values for an option.
140 * \param[in] name Name of the option to start assigning to.
141 * \returns true if \p name is a valid option name.
142 * \throws InvalidInputError if the option is specified more than once
143 * but doesn't support it.
145 bool tryStartOption(const char* name);
147 * Appends a value to the value list of the current option.
149 * \param[in] value Value to assign.
150 * \throws InvalidInputError if the value cannot be converted or if
151 * there are too many values for an option.
153 * Basic exception safety guarantee:
154 * If this method throws, erroneous values are ignored, but it is
155 * possible to continue assigning values to the same option. However,
156 * if \p value would result in more than one value, and some of them
157 * can be converted, but some result in errors, it is currently
158 * possible that some values have been added to the option even if an
159 * exception is thrown.
161 * Strong exception safety guarantee if the option provides value
162 * conversion with the same guarantee. All options where a single
163 * input value always results in a single output value provide this.
166 * This method provides the same exception safety guarantee as the
167 * OptionStorageTemplate::convertValue() method of the storage class
168 * implementing the option where the value is assigned to.
170 void appendValue(const Any& value);
172 * Appends a value to the value list of the current option.
174 * \param[in] value Value to assign.
176 * See appendValue(const Any &) for more details.
178 void appendValue(const std::string& value);
180 * Finish assigning values for the current option.
182 * \throws InvalidInputError if the set of values since startOption()
185 * If this method throws, it returns to the state where the option was
186 * before startOption(), i.e., all values added with appendValue()
187 * since the last startOption() are discarded.
189 * Independent of whether the method throws, the option opened with
190 * startOption() will be closed after the call.
194 * Finish assigning values to a subsection.
198 void finishSection();
200 * Finish assigning options through the object.
209 std::unique_ptr<Impl> impl_;