src/gromacs/commandline/cmdlineparser.h

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  35 /*! \file
  36  * \brief
  37  * Declares gmx::CommandLineParser.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \inpublicapi
  41  * \ingroup module_commandline
  42  */
  43 #ifndef GMX_COMMANDLINE_CMDLINEPARSER_H
  44 #define GMX_COMMANDLINE_CMDLINEPARSER_H
  45
  46 #include <string>
  47 #include <vector>
  48
  49 #include "gromacs/utility/classhelpers.h"
  50
  51 namespace gmx
  52 {
  53
  54 class Options;
  55
  56 /*! \brief
  57  * Implements command-line parsing for Options objects.
  58  *
  59  * Typical usage (without error checking):
  60  * \code
  61    gmx::Options options("name", "description");
  62    // Fill up options
  63
  64    gmx::CommandLineParser(&options).parse(&argc, argv);
  65    options.finish();
  66  * \endcode
  67  *
  68  * \inpublicapi
  69  * \ingroup module_commandline
  70  */
  71 class CommandLineParser
  72 {
  73     public:
  74         /*! \brief
  75          * Creates a command-line parser that sets values for options.
  76          *
  77          * \param[in] options  Options object whose options should be set.
  78          * \throws  std::bad_alloc if out of memory.
  79          */
  80         explicit CommandLineParser(Options *options);
  81         ~CommandLineParser();
  82
  83         /*! \brief
  84          * Makes the parser skip unknown options and keep them in \c argv.
  85          *
  86          * \param[in] bEnabled  Whether to skip and keep unknown options.
  87          * \returns   *this
  88          *
  89          * Setting this option to true has dual effect: unknown options are
  90          * silently skipped, and all recognized options are removed from
  91          * \c argc and \c argv in parse().  These effects should be easy to
  92          * separate into different flags if there is need for it.
  93          *
  94          * The default is false: unknown options result in exceptions and
  95          * \c argc and \c argv are not modified.
  96          *
  97          * Does not throw.
  98          */
  99         CommandLineParser &skipUnknown(bool bEnabled);
 100
 101         /*! \brief
 102          * Makes the parser accept positional arguments
 103          *
 104          * \param[in] bEnabled  Whether to skip and keep positional arguments.
 105          * \returns   *this
 106          *
 107          * Arguments that are not options (ie. no leading hyphen), and
 108          * which come before all options are acceptable if this has
 109          * been enabled. If so, these arguments are left in \c argc
 110          * and \c argv in parse().
 111          *
 112          * The default is false: unknown leading arguments result in
 113          * exceptions and \c argc and \c argv are not modified.
 114          *
 115          * Does not throw.
 116          */
 117         CommandLineParser &allowPositionalArguments(bool bEnabled);
 118
 119         /*! \brief
 120          * Parses the command line.
 121          *
 122          * \throws  std::bad_alloc if out of memory.
 123          * \throws  InvalidInputError if any errors were detected in the input.
 124          *
 125          * All command-line arguments are parsed, and an aggregate
 126          * exception with all the detected errors (including unknown
 127          * options, where applicable) is thrown in the end.
 128          *
 129          * If skipUnknown() was not called, or last called with a
 130          * false value, the input arguments are not modified. If
 131          * skipUnknown() was last called with a true value, only
 132          * unknown options will be retained in \c argc and \c argv.
 133          *
 134          * All positional arguments are retained in the argument list,
 135          * but such arguments must precede all options.
 136          *
 137          * \c argv[0] is never modified.
 138          *
 139          */
 140         void parse(int *argc, char *argv[]);
 141
 142     private:
 143         class Impl;
 144
 145         PrivateImplPointer<Impl> impl_;
 146 };
 147
 148 } // namespace gmx
 149
 150 #endif