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-rw-r--r--src/cam/main.cpp10
-rw-r--r--src/cam/options.cpp133
-rw-r--r--src/cam/options.h41
3 files changed, 172 insertions, 12 deletions
diff --git a/src/cam/main.cpp b/src/cam/main.cpp
index bde47a8f..7934d0bf 100644
--- a/src/cam/main.cpp
+++ b/src/cam/main.cpp
@@ -37,10 +37,12 @@ static int parseOptions(int argc, char *argv[])
{
OptionsParser parser;
- parser.addOption(OptCamera, "Specify which camera to operate on",
- "camera", ArgumentRequired, "camera");
- parser.addOption(OptHelp, "Display this help message", "help");
- parser.addOption(OptList, "List all cameras", "list");
+ parser.addOption(OptCamera, OptionString,
+ "Specify which camera to operate on", "camera",
+ ArgumentRequired, "camera");
+ parser.addOption(OptHelp, OptionNone, "Display this help message",
+ "help");
+ parser.addOption(OptList, OptionNone, "List all cameras", "list");
options = parser.parse(argc, argv);
if (!options.valid())
diff --git a/src/cam/options.cpp b/src/cam/options.cpp
index c13022ce..204081f3 100644
--- a/src/cam/options.cpp
+++ b/src/cam/options.cpp
@@ -12,6 +12,30 @@
#include "options.h"
+/* -----------------------------------------------------------------------------
+ * Option
+ */
+
+const char *Option::typeName() const
+{
+ switch (type) {
+ case OptionNone:
+ return "none";
+
+ case OptionInteger:
+ return "integer";
+
+ case OptionString:
+ return "string";
+ }
+
+ return "unknown";
+}
+
+/* -----------------------------------------------------------------------------
+ * OptionBase<T>
+ */
+
template <typename T>
bool OptionsBase<T>::valid() const
{
@@ -25,12 +49,46 @@ bool OptionsBase<T>::isSet(const T &opt) const
}
template <typename T>
-const std::string &OptionsBase<T>::operator[](const T &opt) const
+const OptionValue &OptionsBase<T>::operator[](const T &opt) const
{
return values_.find(opt)->second;
}
template <typename T>
+bool OptionsBase<T>::parseValue(const T &opt, const Option &option,
+ const char *optarg)
+{
+ OptionValue value;
+
+ switch (option.type) {
+ case OptionNone:
+ break;
+
+ case OptionInteger:
+ unsigned int integer;
+
+ if (optarg) {
+ char *endptr;
+ integer = strtoul(optarg, &endptr, 10);
+ if (*endptr != '\0')
+ return false;
+ } else {
+ integer = 0;
+ }
+
+ value = OptionValue(integer);
+ break;
+
+ case OptionString:
+ value = OptionValue(optarg ? optarg : "");
+ break;
+ }
+
+ values_[opt] = value;
+ return true;
+}
+
+template <typename T>
void OptionsBase<T>::clear()
{
values_.clear();
@@ -38,8 +96,53 @@ void OptionsBase<T>::clear()
template class OptionsBase<int>;
-bool OptionsParser::addOption(int opt, const char *help, const char *name,
- OptionArgument argument, const char *argumentName)
+/* -----------------------------------------------------------------------------
+ * OptionValue
+ */
+
+OptionValue::OptionValue()
+ : type_(OptionNone)
+{
+}
+
+OptionValue::OptionValue(int value)
+ : type_(OptionInteger), integer_(value)
+{
+}
+
+OptionValue::OptionValue(const char *value)
+ : type_(OptionString), string_(value)
+{
+}
+
+OptionValue::OptionValue(const std::string &value)
+ : type_(OptionString), string_(value)
+{
+}
+
+OptionValue::operator int() const
+{
+ if (type_ != OptionInteger)
+ return 0;
+
+ return integer_;
+}
+
+OptionValue::operator std::string() const
+{
+ if (type_ != OptionString)
+ return std::string();
+
+ return string_;
+}
+
+/* -----------------------------------------------------------------------------
+ * OptionsParser
+ */
+
+bool OptionsParser::addOption(int opt, OptionType type, const char *help,
+ const char *name, OptionArgument argument,
+ const char *argumentName)
{
/*
* Options must have at least a short or long name, and a text message.
@@ -56,7 +159,8 @@ bool OptionsParser::addOption(int opt, const char *help, const char *name,
if (optionsMap_.find(opt) != optionsMap_.end())
return false;
- options_.push_back(Option({ opt, name, argument, argumentName, help }));
+ options_.push_back(Option({ opt, type, name, argument, argumentName,
+ help }));
optionsMap_[opt] = &options_.back();
return true;
}
@@ -126,7 +230,13 @@ OptionsParser::Options OptionsParser::parse(int argc, char **argv)
break;
}
- options.values_[c] = optarg ? optarg : "";
+ const Option &option = *optionsMap_[c];
+ if (!options.parseValue(c, option, optarg)) {
+ parseValueError(option);
+ usage();
+ options.clear();
+ break;
+ }
}
return options;
@@ -193,3 +303,16 @@ void OptionsParser::usage()
}
}
}
+
+void OptionsParser::parseValueError(const Option &option)
+{
+ std::string optionName;
+
+ if (option.name)
+ optionName = "--" + std::string(option.name);
+ else
+ optionName = "-" + static_cast<char>(option.opt);
+
+ std::cerr << "Can't parse " << option.typeName()
+ << " argument for option " << optionName << std::endl;
+}
diff --git a/src/cam/options.h b/src/cam/options.h
index b9b7bd25..8b611d37 100644
--- a/src/cam/options.h
+++ b/src/cam/options.h
@@ -17,8 +17,15 @@ enum OptionArgument {
ArgumentOptional,
};
+enum OptionType {
+ OptionNone,
+ OptionInteger,
+ OptionString,
+};
+
struct Option {
int opt;
+ OptionType type;
const char *name;
OptionArgument argument;
const char *argumentName;
@@ -26,20 +33,45 @@ struct Option {
bool hasShortOption() const { return isalnum(opt); }
bool hasLongOption() const { return name != nullptr; }
+ const char *typeName() const;
};
+class OptionValue;
+
template <typename T>
class OptionsBase
{
public:
bool valid() const;
bool isSet(const T &opt) const;
- const std::string &operator[](const T &opt) const;
+ const OptionValue &operator[](const T &opt) const;
private:
friend class OptionsParser;
- std::map<T, std::string> values_;
+
+ bool parseValue(const T &opt, const Option &option, const char *value);
void clear();
+
+ std::map<T, OptionValue> values_;
+};
+
+class OptionValue
+{
+public:
+ OptionValue();
+ OptionValue(int value);
+ OptionValue(const char *value);
+ OptionValue(const std::string &value);
+
+ OptionType type() const { return type_; }
+
+ operator int() const;
+ operator std::string() const;
+
+private:
+ OptionType type_;
+ int integer_;
+ std::string string_;
};
class OptionsParser
@@ -49,7 +81,8 @@ public:
{
};
- bool addOption(int opt, const char *help, const char *name = nullptr,
+ bool addOption(int opt, OptionType type, const char *help,
+ const char *name = nullptr,
OptionArgument argument = ArgumentNone,
const char *argumentName = nullptr);
@@ -57,6 +90,8 @@ public:
void usage();
private:
+ void parseValueError(const Option &option);
+
std::list<Option> options_;
std::map<unsigned int, Option *> optionsMap_;
};