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/*
Please use git log for copyright holder and year information
This file is part of libbash.
libbash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
libbash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with libbash. If not, see <http://www.gnu.org/licenses/>.
*/
///
/// \file source_builtin.h
/// \brief class that implements the source builtin
///
#include "builtins/source_builtin.h"
#include <fstream>
#include <iostream>
#include <string>
#include <unordered_map>
#include <thread>
#include "builtins/builtin_exceptions.h"
#include "cppbash_builtin.h"
#include "core/interpreter.h"
#include "core/bash_ast.h"
#include "exceptions.h"
namespace {
std::mutex parse_mutex;
std::shared_ptr<bash_ast>& parse(const std::string& path)
{
static std::unordered_map<std::string, std::shared_ptr<bash_ast>> ast_cache;
std::lock_guard<std::mutex> parse_lock(parse_mutex);
auto stored_ast = ast_cache.find(path);
if(stored_ast == ast_cache.end())
{
// ensure the path is cached
auto iter = ast_cache.insert(make_pair(path, std::shared_ptr<bash_ast>()));
// this may throw exception
iter.first->second.reset(new bash_ast(path));
stored_ast = iter.first;
}
else if(!(stored_ast->second))
{
throw libbash::parse_exception(path + " cannot be fully parsed");
}
return stored_ast->second;
}
}
int source_builtin::exec(const std::vector<std::string>& bash_args)
{
if(bash_args.size() == 0)
throw libbash::illegal_argument_exception("source: argument required");
const std::string& original_path = _walker.resolve<std::string>("0");
_walker.define("0", bash_args.front(), true);
try
{
parse(bash_args.front())->interpret_with(_walker);
}
catch(return_exception& e) {}
_walker.define("0", original_path, true);
return _walker.get_status();
}
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