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/******************************************************************************
*
* file: ValueArg.h
*
* Copyright (c) 2003, Michael E. Smoot .
* Copyright (c) 2004, Michael E. Smoot, Daniel Aarno.
* All rights reverved.
*
* See the file COPYING in the top directory of this distribution for
* more information.
*
* THE SOFTWARE IS PROVIDED _AS IS_, WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*****************************************************************************/
#ifndef TCLAP_VALUE_ARGUMENT_H
#define TCLAP_VALUE_ARGUMENT_H
#include <string>
#include <vector>
#include <tclap/Arg.h>
#include <tclap/Constraint.h>
#ifdef HAVE_CONFIG_H
#include <config.h>
#else
#define HAVE_SSTREAM
#endif
#if defined(HAVE_SSTREAM)
#include <sstream>
#elif defined(HAVE_STRSTREAM)
#include <strstream>
#else
#error "Need a stringstream (sstream or strstream) to compile!"
#endif
namespace TCLAP {
template<class T> class ValueArg;
namespace VALUE_ARG_HELPER {
enum Error_e { EXTRACT_FAILURE = 1000, EXTRACT_TOO_MANY };
/**
* This class is used to extract a value from an argument.
* It is used because we need a special implementation to
* deal with std::string and making a specialiced function
* puts it in the T segment, thus generating link errors.
* Having a specialiced class makes the symbols weak.
* This is not pretty but I don't know how to make it
* work any other way.
*/
template<class T> class ValueExtractor
{
/**
*
*/
friend class ValueArg<T>;
private:
/**
* Reference to the value where the result of the extraction will
* be put.
*/
T &_value;
/**
* Constructor.
* \param value - Where the value extracted will be put.
*/
ValueExtractor(T &value) : _value(value) { }
/**
* Method that will attempt to parse the input stream for a value
* of type T.
* \param val - Where the value parsed will be put.
*/
int extractValue( const std::string& val )
{
#if defined(HAVE_SSTREAM)
std::istringstream is(val);
#elif defined(HAVE_STRSTREAM)
std::istrstream is(val.c_str());
#else
#error "Need a stringstream (sstream or strstream) to compile!"
#endif
int valuesRead = 0;
while ( is.good() )
{
if ( ! (is >> _value ))
break;
valuesRead++;
}
if ( is.fail() )
return EXTRACT_FAILURE;
if ( valuesRead > 1 )
return EXTRACT_TOO_MANY;
return 0;
}
};
/**
* Specialization for string. This is necessary because istringstream
* operator>> is not able to ignore spaces... meaning -x "X Y" will only
* read 'X'... and thus the specialization.
*/
template<> class ValueExtractor<std::string>
{
/**
*
*/
friend class ValueArg<std::string>;
private:
/**
* Reference to the value where the result of the extraction will
* be put.
*/
std::string &_value;
/**
* Constructor.
* \param value - Where the value extracted will be put.
*/
ValueExtractor(std::string &value) : _value(value) {}
/**
* Method that will attempt to parse the input stream for a value
* of type std::string.
* \param val - Where the string parsed will be put.
*/
int extractValue( const std::string& val )
{
_value = val;
return 0;
}
};
} //namespace VALUE_ARG_HELPER
/**
* The basic labeled argument that parses a value.
* This is a template class, which means the type T defines the type
* that a given object will attempt to parse when the flag/name is matched
* on the command line. While there is nothing stopping you from creating
* an unflagged ValueArg, it is unwise and would cause significant problems.
* Instead use an UnlabeledValueArg.
*/
template<class T>
class ValueArg : public Arg
{
protected:
/**
* The value parsed from the command line.
* Can be of any type, as long as the >> operator for the type
* is defined.
*/
T _value;
/**
* A human readable description of the type to be parsed.
* This is a hack, plain and simple. Ideally we would use RTTI to
* return the name of type T, but until there is some sort of
* consistent support for human readable names, we are left to our
* own devices.
*/
std::string _typeDesc;
/**
* A Constraint this Arg must conform to.
*/
Constraint<T>* _constraint;
/**
* Extracts the value from the string.
* Attempts to parse string as type T, if this fails an exception
* is thrown.
* \param val - value to be parsed.
*/
void _extractValue( const std::string& val );
public:
/**
* Labeled ValueArg constructor.
* You could conceivably call this constructor with a blank flag,
* but that would make you a bad person. It would also cause
* an exception to be thrown. If you want an unlabeled argument,
* use the other constructor.
* \param flag - The one character flag that identifies this
* argument on the command line.
* \param name - A one word name for the argument. Can be
* used as a long flag on the command line.
* \param desc - A description of what the argument is for or
* does.
* \param req - Whether the argument is required on the command
* line.
* \param value - The default value assigned to this argument if it
* is not present on the command line.
* \param typeDesc - A short, human readable description of the
* type that this object expects. This is used in the generation
* of the USAGE statement. The goal is to be helpful to the end user
* of the program.
* \param v - An optional visitor. You probably should not
* use this unless you have a very good reason.
*/
ValueArg( const std::string& flag,
const std::string& name,
const std::string& desc,
bool req,
T value,
const std::string& typeDesc,
Visitor* v = NULL);
/**
* Labeled ValueArg constructor.
* You could conceivably call this constructor with a blank flag,
* but that would make you a bad person. It would also cause
* an exception to be thrown. If you want an unlabeled argument,
* use the other constructor.
* \param flag - The one character flag that identifies this
* argument on the command line.
* \param name - A one word name for the argument. Can be
* used as a long flag on the command line.
* \param desc - A description of what the argument is for or
* does.
* \param req - Whether the argument is required on the command
* line.
* \param value - The default value assigned to this argument if it
* is not present on the command line.
* \param typeDesc - A short, human readable description of the
* type that this object expects. This is used in the generation
* of the USAGE statement. The goal is to be helpful to the end user
* of the program.
* \param parser - A CmdLine parser object to add this Arg to
* \param v - An optional visitor. You probably should not
* use this unless you have a very good reason.
*/
ValueArg( const std::string& flag,
const std::string& name,
const std::string& desc,
bool req,
T value,
const std::string& typeDesc,
CmdLineInterface& parser,
Visitor* v = NULL );
/**
* Labeled ValueArg constructor.
* You could conceivably call this constructor with a blank flag,
* but that would make you a bad person. It would also cause
* an exception to be thrown. If you want an unlabeled argument,
* use the other constructor.
* \param flag - The one character flag that identifies this
* argument on the command line.
* \param name - A one word name for the argument. Can be
* used as a long flag on the command line.
* \param desc - A description of what the argument is for or
* does.
* \param req - Whether the argument is required on the command
* line.
* \param value - The default value assigned to this argument if it
* is not present on the command line.
* \param constraint - A pointer to a Constraint object used
* to constrain this Arg.
* \param parser - A CmdLine parser object to add this Arg to.
* \param v - An optional visitor. You probably should not
* use this unless you have a very good reason.
*/
ValueArg( const std::string& flag,
const std::string& name,
const std::string& desc,
bool req,
T value,
Constraint<T>* constraint,
CmdLineInterface& parser,
Visitor* v = NULL );
/**
* Labeled ValueArg constructor.
* You could conceivably call this constructor with a blank flag,
* but that would make you a bad person. It would also cause
* an exception to be thrown. If you want an unlabeled argument,
* use the other constructor.
* \param flag - The one character flag that identifies this
* argument on the command line.
* \param name - A one word name for the argument. Can be
* used as a long flag on the command line.
* \param desc - A description of what the argument is for or
* does.
* \param req - Whether the argument is required on the command
* line.
* \param value - The default value assigned to this argument if it
* is not present on the command line.
* \param constraint - A pointer to a Constraint object used
* to constrain this Arg.
* \param v - An optional visitor. You probably should not
* use this unless you have a very good reason.
*/
ValueArg( const std::string& flag,
const std::string& name,
const std::string& desc,
bool req,
T value,
Constraint<T>* constraint,
Visitor* v = NULL );
/**
* Handles the processing of the argument.
* This re-implements the Arg version of this method to set the
* _value of the argument appropriately. It knows the difference
* between labeled and unlabeled.
* \param i - Pointer the the current argument in the list.
* \param args - Mutable list of strings. Passed
* in from main().
*/
virtual bool processArg(int* i, std::vector<std::string>& args);
/**
* Returns the value of the argument.
*/
T& getValue() ;
/**
* Specialization of shortID.
* \param val - value to be used.
*/
virtual std::string shortID(const std::string& val = "val") const;
/**
* Specialization of longID.
* \param val - value to be used.
*/
virtual std::string longID(const std::string& val = "val") const;
};
/**
* Constructor implementation.
*/
template<class T>
ValueArg<T>::ValueArg(const std::string& flag,
const std::string& name,
const std::string& desc,
bool req,
T val,
const std::string& typeDesc,
Visitor* v)
: Arg(flag, name, desc, req, true, v),
_value( val ),
_typeDesc( typeDesc ),
_constraint( NULL )
{ }
template<class T>
ValueArg<T>::ValueArg(const std::string& flag,
const std::string& name,
const std::string& desc,
bool req,
T val,
const std::string& typeDesc,
CmdLineInterface& parser,
Visitor* v)
: Arg(flag, name, desc, req, true, v),
_value( val ),
_typeDesc( typeDesc ),
_constraint( NULL )
{
parser.add( this );
}
template<class T>
ValueArg<T>::ValueArg(const std::string& flag,
const std::string& name,
const std::string& desc,
bool req,
T val,
Constraint<T>* constraint,
Visitor* v)
: Arg(flag, name, desc, req, true, v),
_value( val ),
_typeDesc( constraint->shortID() ),
_constraint( constraint )
{ }
template<class T>
ValueArg<T>::ValueArg(const std::string& flag,
const std::string& name,
const std::string& desc,
bool req,
T val,
Constraint<T>* constraint,
CmdLineInterface& parser,
Visitor* v)
: Arg(flag, name, desc, req, true, v),
_value( val ),
_typeDesc( constraint->shortID() ),
_constraint( constraint )
{
parser.add( this );
}
/**
* Implementation of getValue().
*/
template<class T>
T& ValueArg<T>::getValue() { return _value; }
/**
* Implementation of processArg().
*/
template<class T>
bool ValueArg<T>::processArg(int *i, std::vector<std::string>& args)
{
if ( _ignoreable && Arg::ignoreRest() )
return false;
if ( _hasBlanks( args[*i] ) )
return false;
std::string flag = args[*i];
std::string value = "";
trimFlag( flag, value );
if ( argMatches( flag ) )
{
if ( _alreadySet )
throw( CmdLineParseException("Argument already set!", toString()) );
if ( Arg::delimiter() != ' ' && value == "" )
throw( ArgParseException(
"Couldn't find delimiter for this argument!",
toString() ) );
if ( value == "" )
{
(*i)++;
if ( static_cast<unsigned int>(*i) < args.size() )
_extractValue( args[*i] );
else
throw( ArgParseException("Missing a value for this argument!",
toString() ) );
}
else
_extractValue( value );
_alreadySet = true;
_checkWithVisitor();
return true;
}
else
return false;
}
/**
* Implementation of shortID.
*/
template<class T>
std::string ValueArg<T>::shortID(const std::string& val) const
{
return Arg::shortID( _typeDesc );
}
/**
* Implementation of longID.
*/
template<class T>
std::string ValueArg<T>::longID(const std::string& val) const
{
return Arg::longID( _typeDesc );
}
template<class T>
void ValueArg<T>::_extractValue( const std::string& val )
{
VALUE_ARG_HELPER::ValueExtractor<T> ve(_value);
int err = ve.extractValue(val);
if ( err == VALUE_ARG_HELPER::EXTRACT_FAILURE )
throw( ArgParseException("Couldn't read argument value from string '" +
val + "'", toString() ) );
if ( err == VALUE_ARG_HELPER::EXTRACT_TOO_MANY )
throw( ArgParseException(
"More than one valid value parsed from string '" +
val + "'", toString() ) );
if ( _constraint != NULL )
if ( ! _constraint->check( _value ) )
throw( CmdLineParseException( "Value '" + val +
"' does not meet constraint: " +
_constraint->description(),
toString() ) );
}
} // namespace TCLAP
#endif