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/*
Ousía
Copyright (C) 2014, 2015 Benjamin Paaßen, Andreas Stöckel
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef NDEBUG
//#define FILELOCATOR_DEBUG_PRINT
#endif
#ifdef FILELOCATOR_DEBUG_PRINT
#include <iostream>
#endif
#include <algorithm>
#include <fstream>
#include <boost/filesystem.hpp>
#include "FileLocator.hpp"
#include "SpecialPaths.hpp"
namespace fs = boost::filesystem;
namespace ousia {
void FileLocator::addPath(const std::string &path,
std::vector<std::string> &paths)
{
auto it = std::find(paths.begin(), paths.end(), path);
if (it == paths.end()) {
paths.push_back(path);
}
}
void FileLocator::addSearchPath(const std::string &path,
std::set<ResourceType> types)
{
// Skip empty or non-existant paths
if (path.empty() || !fs::exists(path) || !fs::is_directory(path)) {
return;
}
// Canonicalize the given path, check whether it exists
std::string canonicalPath = fs::canonical(path).generic_string();
#ifdef FILELOCATOR_DEBUG_PRINT
std::cout << "FileLocator: Adding search path " << canonicalPath
<< std::endl;
#endif
// Insert the path for all given types.
for (auto &type : types) {
auto it = searchPaths.find(type);
if (it != searchPaths.end()) {
addPath(canonicalPath, it->second);
} else {
searchPaths.insert({type, {canonicalPath}});
}
}
}
void FileLocator::addSearchPath(const std::string &path, ResourceType type)
{
addSearchPath(path, std::set<ResourceType>{type});
}
void FileLocator::addDefaultSearchPaths(const std::string &relativeTo)
{
// Abort if the base directory is empty
if (relativeTo.empty() || !fs::exists(relativeTo) ||
!fs::is_directory(relativeTo)) {
return;
}
// Add the search paths
fs::path base{relativeTo};
addSearchPath(base.generic_string(), ResourceType::UNKNOWN);
addSearchPath((base / "domain").generic_string(),
ResourceType::DOMAIN_DESC);
addSearchPath((base / "typesystem").generic_string(),
ResourceType::TYPESYSTEM);
}
void FileLocator::addDefaultSearchPaths()
{
addDefaultSearchPaths(SpecialPaths::getGlobalDataDir());
addDefaultSearchPaths(SpecialPaths::getLocalDataDir());
#ifndef NDEBUG
addDefaultSearchPaths(SpecialPaths::getDebugDataDir());
#endif
}
void FileLocator::addUnittestSearchPath(const std::string &subdir,
ResourceType type)
{
addSearchPath((fs::path{SpecialPaths::getDebugTestdataDir()} / subdir)
.generic_string(),
type);
}
bool FileLocator::doLocate(Resource &resource, const std::string &path,
const ResourceType type,
const std::string &relativeTo) const
{
#ifdef FILELOCATOR_DEBUG_PRINT
std::cout << "FileLocator: Searching for \"" << path << "\"" << std::endl;
#endif
if (!relativeTo.empty()) {
fs::path base(relativeTo);
if (fs::exists(base)) {
// Look if 'relativeTo' is a directory already.
if (!fs::is_directory(base)) {
// If not we use the parent directory.
base = base.parent_path();
}
// Use the / operator to append the path.
base /= path;
// If we already found a fitting resource there, use that.
if (fs::exists(base)) {
std::string location = fs::canonical(base).generic_string();
#ifdef FILELOCATOR_DEBUG_PRINT
std::cout << "FileLocator: Found \"" << path << "\" at "
<< location << std::endl;
#endif
resource = Resource(true, *this, type, location);
return true;
}
}
}
// If the path starts with "./" only perform relative lookups!
if (path.substr(0, 2) == "./") {
return false;
}
// Otherwise look in the search paths, search backwards, last defined search
// paths have a higher precedence
auto it = searchPaths.find(type);
if (it != searchPaths.end()) {
const auto &paths = it->second;
for (auto it = paths.rbegin(); it != paths.rend(); it++) {
#ifdef FILELOCATOR_DEBUG_PRINT
std::cout << "FileLocator: Entering " << *it << std::endl;
#endif
fs::path p{*it};
p /= path;
if (fs::exists(p)) {
std::string location = fs::canonical(p).generic_string();
#ifdef FILELOCATOR_DEBUG_PRINT
std::cout << "FileLocator: Found \"" << path << "\" in "
<< location << std::endl;
#endif
resource = Resource(true, *this, type, location);
return true;
}
}
}
return false;
}
std::unique_ptr<std::istream> FileLocator::doStream(
const std::string &location) const
{
return std::unique_ptr<std::istream>{new std::ifstream(location)};
}
}
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