/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_shell.hxx"
#include <stdexcept>
#include <osl/diagnose.h>
#include "cmdline.hxx"

//---------------------------------
/** Simple command line abstraction
*/

//################################
// Creation
//################################


CommandLine::CommandLine(size_t argc, char* argv[], const std::string& ArgPrefix) :
	m_argc(argc),
	m_argv(argv),
	m_argprefix(ArgPrefix)
{
}


//################################
// Query
//################################


/** Return the argument count
*/
size_t CommandLine::get_arg_count() const
{
	return m_argc;
}

/** Return an argument by index
	This method doesn't skip argument
	names if any, so if the second
	argument is an argument name the
	function nevertheless returns it.

	@precond	0 <= Index < GetArgumentCount

	@throws std::out_of_range exception
	if the given index is to high
*/
std::string CommandLine::get_arg(size_t Index) const
{
	OSL_PRECOND(Index < m_argc, "Index out of range");

	if (Index > (m_argc - 1))
		throw std::out_of_range("Invalid index");

	return m_argv[Index];
}


/** Returns all argument name found in the
	command line. An argument will be identified
	by a specified prefix. The standard prefix
	is '-'.
	If the are no argument names the returned
	container is empty.
*/
StringListPtr_t CommandLine::get_arg_names() const
{
	StringListPtr_t arg_cont(new StringList_t());

	for (size_t i = 0; i < m_argc; i++)
	{
		std::string argn = m_argv[i];

		if (is_arg_name(argn))
			arg_cont->push_back(argn);
	}

	return arg_cont;
}

/** Returns an argument by name. If there are
	duplicate argument names in the command line,
	the first one wins.
	Argument name an the argument value must be separated
	by spaces. If the argument value starts with an
	argument prefix use quotes else the return value is
	an empty string because the value will be interpreted
	as the next argument name.
	If an argument value contains spaces use quotes.

	@precond	GetArgumentNames() -> has element ArgumentName

	@throws std::invalid_argument exception
	if the specified argument could not be
	found
*/
std::string CommandLine::get_arg(const std::string& ArgumentName) const
{
	std::string arg_value;
	size_t i;
	for ( i = 0; i < m_argc; i++)
	{
		std::string arg = m_argv[i];

		if (ArgumentName == arg && ((i+1) < m_argc) && !is_arg_name(m_argv[i+1]))
		{
			arg_value = m_argv[i+1];
			break;
		}
	}

	if (i == m_argc)
		throw std::invalid_argument("Invalid argument name");

	return arg_value;
}


//################################
// Command
//################################


/** Set the prefix used to identify arguments in
	the command line.

	@precond	prefix is not empty

	@throws std::invalid_argument exception if
	the prefix is empty
*/
void CommandLine::set_arg_prefix(const std::string& Prefix)
{
	OSL_PRECOND(Prefix.length(), "Empty argument prefix!");

	if (0 == Prefix.length())
		throw std::invalid_argument("Empty argument prefix not allowed");

	m_argprefix = Prefix;
}


/** Returns whether a given argument is an argument name
*/
bool CommandLine::is_arg_name(const std::string& Argument) const
{
	return (0 == Argument.compare(0, m_argprefix.length(), m_argprefix));
}