Util: Add argument parsing to ArgParser

src/util/argparser.cpp

@@ -1,7 +1,8 @@
 #include <algorithm> // find_if
-#include <cstdio> // printf
-#include <limits> // numeric_limits
-#include <string> // stod, stoi, stoul
+#include <cstddef>   // size_t
+#include <cstdio>    // printf
+#include <limits>    // numeric_limits
+#include <string>    // stod, stoi, stoul
 #include <string_view>
 
 #include "util/argparser.h"
@@ -187,12 +188,34 @@ bool ArgParser::parseLongOption(std::string_view option, std::string_view next)
 	return result;
 }
 
+bool ArgParser::parseArgument(std::string_view argument)
+{
+	// No handler for argument
+	if (m_argumentIndex >= m_arguments.size()) {
+		return false;
+	}
+
+	Argument& currentArgument = m_arguments.at(m_argumentIndex);
+	bool result = currentArgument.acceptValue(argument.data());
+
+	if (result) {
+		currentArgument.addedValues++;
+	}
+
+	if (currentArgument.addedValues >= currentArgument.maxValues) {
+		m_argumentIndex++;
+	}
+
+	return result;
+}
+
 bool ArgParser::parse(int argc, const char* argv[])
 {
 	bool result = true;
 
-	// Skip program name argument
+	// Set looping indices
 	m_optionIndex = 1;
+	m_argumentIndex = 0;
 
 	// By default parse all '-' prefixed parameters as options
 	m_nonOptionMode = false;
@@ -202,12 +225,12 @@ bool ArgParser::parse(int argc, const char* argv[])
 
 	std::string_view argument;
 	std::string_view next;
-	for (; m_optionIndex < argc; ++m_optionIndex) {
-		printf("argv[%d]: %s\n", m_optionIndex, argv[m_optionIndex]);
+	for (; m_optionIndex < (size_t)argc; ++m_optionIndex) {
+		printf("argv[%zu]: %s\n", m_optionIndex, argv[m_optionIndex]);
 
 		// Get the current and next parameter
 		argument = argv[m_optionIndex];
-		if (m_optionIndex + 1 < argc && argv[m_optionIndex + 1][0] != '-') {
+		if (m_optionIndex + 1 < (size_t)argc && argv[m_optionIndex + 1][0] != '-') {
 			next = argv[m_optionIndex + 1];
 		}
 		else {
@@ -239,7 +262,9 @@ bool ArgParser::parse(int argc, const char* argv[])
 			if (m_stopParsingOnFirstNonOption) {
 				m_nonOptionMode = true;
 			}
-			printf("-> argu: '%s'", argument.data());
+			if (!parseArgument(argument)) {
+				result = false;
+			}
 		}
 
 		if (m_exitOnFirstError && !result) {
@@ -247,9 +272,20 @@ bool ArgParser::parse(int argc, const char* argv[])
 		}
 	}
 
+	// Check any leftover arguments for required
+	for (; m_argumentIndex < m_arguments.size(); ++m_argumentIndex) {
+		Argument& currentArgument = m_arguments.at(m_argumentIndex);
+		if (currentArgument.minValues > currentArgument.addedValues) {
+			result = false;
+			// TODO: decide if and what to print here
+		}
+	}
+
 	return result;
 }
 
+// -----------------------------------------
+
 void ArgParser::addOption(Option&& option)
 {
 	m_options.push_back(option);
@@ -363,8 +399,7 @@ void ArgParser::addOption(unsigned int& value, char shortName, const char* longN
 				return false;
 			}
 
-			if (convert <= std::numeric_limits<unsigned int>::max())
-			{
+			if (convert <= std::numeric_limits<unsigned int>::max()) {
 				value = static_cast<unsigned int>(convert);
 				return true;
 			}
@@ -414,4 +449,47 @@ void ArgParser::addOption(std::vector<std::string>& values, char shortName, cons
 	addOption(std::move(option));
 }
 
+// -----------------------------------------
+
+void ArgParser::addArgument(Argument&& argument)
+{
+	m_arguments.push_back(argument);
+}
+
+void ArgParser::addArgument(std::string& value, const char* name, const char* usageString, const char* manString, Required required)
+{
+	size_t minValues = required == Required::Yes ? 1 : 0;
+	Argument argument {
+		name,
+		usageString,
+		manString,
+		minValues,
+		1,
+		0,
+		[&value](const char* a) -> bool {
+			value = a;
+			return true;
+		}
+	};
+	addArgument(std::move(argument));
+}
+
+void ArgParser::addArgument(std::vector<std::string>& values, const char* name, const char* usageString, const char* manString, Required required)
+{
+	size_t minValues = required == Required::Yes ? 1 : 0;
+	Argument argument {
+		name,
+		usageString,
+		manString,
+		minValues,
+		values.max_size(),
+		0,
+		[&values](const char* a) -> bool {
+			values.push_back(a);
+			return true;
+		}
+	};
+	addArgument(std::move(argument));
+}
+
 } // namespace Util

src/util/argparser.h

@@ -1,6 +1,7 @@
 #ifndef ARG_PARSER_H
 #define ARG_PARSER_H
 
+#include <cstddef>    // size_t
 #include <functional> // function
 #include <string>
 #include <string_view>
@@ -40,6 +41,13 @@ public:
 	};
 
 	struct Argument {
+		const char* name { nullptr };
+		const char* usageString { nullptr };
+		const char* manString { nullptr };
+		size_t minValues { 0 };
+		size_t maxValues { 1 };
+		size_t addedValues { 0 };
+		std::function<bool(const char*)> acceptValue;
 	};
 
 	bool parse(int argc, const char* argv[]);
@@ -54,6 +62,10 @@ public:
 	void addOption(double& value, char shortName, const char* longName, const char* usageString, const char* manString, const char* argumentName = "", Required requiresArgument = Required::No);
 	void addOption(std::vector<std::string>& values, char shortName, const char* longName, const char* usageString, const char* manString, const char* argumentName = "", Required requiresArgument = Required::No);
 
+	void addArgument(Argument&& argument);
+	void addArgument(std::string& value, const char* name, const char* usageString, const char* manString, Required required = Required::No);
+	void addArgument(std::vector<std::string>& values, const char* name, const char* usageString, const char* manString, Required required = Required::No);
+
 	void setErrorReporting(bool state) { m_errorReporting = state; }
 	void setExitOnFirstError(bool state) { m_exitOnFirstError = state; }
 	void setStopParsingOnFirstNonOption(bool state) { m_stopParsingOnFirstNonOption = state; }
@@ -63,15 +75,17 @@ private:
 	void printOptionError(const char* name, Error error, bool longName = true);
 	bool parseShortOption(std::string_view option, std::string_view next);
 	bool parseLongOption(std::string_view option, std::string_view next);
+	bool parseArgument(std::string_view argument);
 
 	bool m_errorReporting { true };
 	bool m_exitOnFirstError { true };
 	bool m_stopParsingOnFirstNonOption { false };
 
-	int m_optionIndex { 1 };
+	size_t m_optionIndex { 1 };
+	size_t m_argumentIndex { 0 };
 	bool m_nonOptionMode { false };
 
-	const char* m_name;
+	const char* m_name { nullptr };
 	std::vector<Option> m_options;
 	std::vector<Argument> m_arguments;
 };