#define __COMMAND_OPTION_H
#include <string>
+#include <sstream>
+#include <stdexcept>
-#include "argument.h"
+#include "parameter.h"
namespace command {
/**
* Options are non-required, named parameters of program.
*
* Example:
- * ./myprog OptionName OptionValue
+ * ./myprog OptionName=OptionValue
*/
template<typename OptionType>
class Option
- : public Argument<OptionType> {
+ : public Parameter, public Callable<OptionType> {
public:
-// typedef typename Argument<OptionType, Lambda>::FunctionType FunctionType;
+ typedef std::string OptionName;
protected:
/**
- * Option name
+ * Current Option name
*/
- std::string name;
+ OptionName name;
+
+ /**
+ * Current Option value
+ */
+ OptionType value;
+
+ /** Variable indicating if current Option was already used or not */
+ bool used = false;
public:
/**
* @param description Description of current Option
* @param function Function used to handle current Option.
*/
- Option(std::string name, std::string description, void (*function)(OptionType))
- : name(name), Argument<OptionType>(description, function) {
+ Option(std::string name, const std::string & description, void (*function)(OptionType))
+ : Parameter(description), Callable<OptionType>(function), name(name) {
}
+
+ /**
+ *
+ */
virtual ~Option() { }
+ /**
+ *
+ */
virtual void handle() {
- std::cout << "Option::handle()" << std::endl;
- this->call(std::string("O"));
+ this->call(value);
+ }
+
+ /**
+ * Method used for checking if Option understands given user value.
+ * If so current Option is flagged as used and no more checks against
+ * it will be done in future.
+ *
+ * Passed value should be in form of:
+ * OptionName=OptionValue
+ *
+ * If no equal sign is after OptionName part,
+ * std::invalid_argument exception with appropriate message is thrown
+ *
+ * If conversion of OptionValue part to OptionType failed,
+ * std::invalid_argument exception with appropriate message is thrown
+ *
+ * @param argv command line value against which test will be made.
+ * User value should be in format: OptionName=OptionValue.
+ *
+ * @return If passed argv succesfully detected OptionName part as a
+ * current option and its OptionValue part has been succesfully
+ * converted to OptionType, returns true and Option is set as used one.
+ * Otherwise returns false and can be used to check against next value.
+ *
+ * @throw std::invalid_argument when OptionName part has no equal sign
+ * after itself
+ * @throw std::invalid_argument when OptionValue part failed conversion
+ * to OptionType
+ */
+ virtual bool understand(const std::string & argv) {
+ if ((!used) &&
+ (argv.find(name) == 0)) {
+ std::size_t pos = argv.find("=");
+ if (pos != name.size()) {
+ throw std::invalid_argument("Option: " + name + " requires value but no one has been provided");
+ }
+
+ std::stringstream ss;
+
+ ss << argv.substr(pos + 1);
+ ss >> value;
+
+ if (ss.fail()) {
+ throw std::invalid_argument("Value for option: " + name + " failed conversion to the required type");
+ }
+
+ used = true;
+ return true;
+ }
+ return false;
}
};
}