Class Arg

Defined in File arg.hpp

Inheritance Relationships

Derived Types

public ecl::MultiArg< T > (Template Class MultiArg)
public ecl::SwitchArg (Class SwitchArg)
public ecl::ValueArg< T > (Template Class ValueArg)

Class Documentation

class Arg

Virtual parent for all the different argument classes.

A virtual base class that defines the essential data for all arguments. This class, or one of its existing children, must be subclassed to do anything.

Subclassed by ecl::MultiArg< T >, ecl::SwitchArg, ecl::ValueArg< T >

Public Functions

inline virtual ~Arg(): Destructor.

inline virtual void addToList(std::list<Arg*> &argList) const

Adds this to the specified list of Args.

Overridden by Args that need to added to the end of the list.

Parameters: argList – - The list to add this to.

virtual bool processArg(int *i, std::vector<std::string> &args) = 0

Pure virtual method meant to handle the parsing and value assignment of the string on the command line.

Parameters

i – - Pointer the the current argument in the list.
args – - Mutable list of strings. What is passed in from main.

inline virtual bool operator==(const Arg &a) const

Operator ==. Equality operator. Must be virtual to handle unlabeled args.

Parameters: a – - The Arg to be compared to this.

inline const std::string &getFlag() const: Returns the argument flag.

inline const std::string &getName() const: Returns the argument name.

inline std::string getDescription() const: Returns the argument description.

inline virtual bool isRequired() const: Indicates whether the argument is required.

inline void forceRequired(): Sets _required to true. This is used by the XorHandler. You really have no reason to ever use it.

inline void xorSet(): Sets the _alreadySet value to true. This is used by the XorHandler. You really have no reason to ever use it.

inline bool isValueRequired() const: Indicates whether a value must be specified for argument.

inline bool isSet() const: Indicates whether the argument has already been set. Only true if the arg has been matched on the command line.

inline bool isIgnoreable() const: Indicates whether the argument can be ignored, if desired.

inline virtual bool argMatches(const std::string &s) const

A method that tests whether a string matches this argument. This is generally called by the processArg() method. This method could be re-implemented by a child to change how arguments are specified on the command line.

Parameters: s – - The string to be compared to the flag/name to determine whether the arg matches.

inline virtual std::string toString() const: Returns a simple string representation of the argument. Primarily for debugging.

inline virtual std::string shortID(const std::string &valueId = "val") const

Returns a short ID for the usage.

Parameters: valueId – - The value used in the id.

inline virtual std::string longID(const std::string &valueId = "val") const

Returns a long ID for the usage.

Parameters: valueId – - The value used in the id.

inline virtual void trimFlag(std::string &flag, std::string &value) const

Trims a value off of the flag.

Implementation of trimFlag.

Parameters

flag – - The string from which the flag and value will be trimmed. Contains the flag once the value has been trimmed.
value – - Where the value trimmed from the string will be stored.

inline bool _hasBlanks(const std::string &s) const

Checks whether a given string has blank chars, indicating that it is a combined SwitchArg

. If so, return true, otherwise return false.

Implementation of _hasBlanks.

Parameters: s – - string to be checked.

inline void setRequireLabel(const std::string &s)

Sets the requireLabel. Used by XorHandler. You shouldn’t ever use this.

Parameters: s – - Set the requireLabel to this value.

inline virtual bool allowMore()

inline virtual bool acceptsMultipleValues()

Public Static Functions

static inline void beginIgnoring(): Begin ignoring arguments since the “–” argument was specified.

static inline bool ignoreRest(): Whether to ignore the rest.

static inline char delimiter(): The delimiter that separates an argument flag/name from the value.

static inline char blankChar(): The char used as a place holder when SwitchArgs are combined. Currently set to ‘*’, which shouldn’t cause many problems since *’s are expanded by most shells on the command line.

static inline char flagStartChar(): The char that indicates the beginning of a flag. Currently ‘-’.

static inline std::string flagStartString(): The sting that indicates the beginning of a flag. Currently “-”. Should be identical to flagStartChar.

static inline std::string nameStartString(): The sting that indicates the beginning of a name. Currently “–”. Should be flagStartChar twice.

static inline std::string ignoreNameString(): The name used to identify the ignore rest argument.

static inline void setDelimiter(char c)

Sets the delimiter for all arguments.

Parameters: c – - The character that delimits flags/names from values.

Protected Functions

inline void _checkWithVisitor() const: Performs the special handling described by the Vistitor.

inline Arg(const std::string &flag, const std::string &name, const std::string &desc, bool req, bool valreq, Visitor *v = NULL)

Primary constructor. YOU (yes you) should NEVER construct an Arg directly, this is a base class that is extended by various children that are meant to be used. Use SwitchArg, ValueArg, MultiArg, UnlabeledValueArg, or UnlabeledMultiArg instead.

Parameters

flag – - The flag identifying the argument.
name – - The name identifying the argument.
desc – - The description of the argument, used in the usage.
req – - Whether the argument is required.
valreq – - Whether the a value is required for the argument.
v – - The visitor checked by the argument. Defaults to NULL.

Protected Attributes

std::string _flag: The single char flag used to identify the argument. This value (preceded by a dash {-}), can be used to identify an argument on the command line. The _flag can be blank, in fact this is how unlabeled args work. Unlabeled args must override appropriate functions to get correct handling. Note that the _flag does NOT include the dash as part of the flag.

std::string _name: A single work namd indentifying the argument. This value (preceded by two dashed {—}) can also be used to identify an argument on the command line. Note that the _name does NOT include the two dashes as part of the _name. The _name cannot be blank.

std::string _description: Description of the argument.

bool _required: Indicating whether the argument is required.

std::string _requireLabel: Label to be used in usage description. Normally set to “required”, but can be changed when necessary.

bool _valueRequired: Indicates whether a value is required for the argument. Note that the value may be required but the argument/value combination may not be, as specified by _required.

bool _alreadySet: Indicates whether the argument has been set. Indicates that a value on the command line has matched the name/flag of this argument and the values have been set accordingly.

Visitor *_visitor: A pointer to a vistitor object. The visitor allows special handling to occur as soon as the argument is matched. This defaults to NULL and should not be used unless absolutely necessary.

bool _ignoreable: Whether this argument can be ignored, if desired.

bool _xorSet: Indicates that the arg was set as part of an XOR and not on the command line.

bool _acceptsMultipleValues