Aegisub/libaegisub/common/mru.cpp

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// Copyright (c) 2010, Amar Takhar <verm@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#include "libaegisub/mru.h"
#include "libaegisub/cajun/writer.h"
#include "libaegisub/io.h"
#include "libaegisub/json.h"
#include "libaegisub/log.h"
#include "libaegisub/option.h"
#include "libaegisub/option_value.h"
namespace {
const char *mru_names[] = {
"Audio",
"Find",
"Keyframes",
"Replace",
"Subtitle",
"Timecodes",
"Video",
};
const char *option_names[] = {
"Limits/MRU",
"Limits/Find Replace",
"Limits/MRU",
"Limits/Find Replace",
"Limits/MRU",
"Limits/MRU",
"Limits/MRU",
};
int mru_index(const char *key) {
int i;
switch (*key) {
case 'A': i = 0; break;
case 'F': i = 1; break;
case 'K': i = 2; break;
case 'R': i = 3; break;
case 'S': i = 4; break;
case 'T': i = 5; break;
case 'V': i = 6; break;
default: return -1;
}
return strcmp(key, mru_names[i]) == 0 ? i : -1;
}
}
namespace agi {
MRUManager::MRUManager(agi::fs::path const& config, std::pair<const char *, size_t> default_config, agi::Options *options)
: config_name(config)
, options(options)
{
LOG_D("agi/mru") << "Loading MRU List";
auto root = json_util::file(config, default_config);
for (auto const& it : static_cast<json::Object const&>(root))
Load(it.first.c_str(), it.second);
}
MRUManager::MRUListMap &MRUManager::Find(const char *key) {
auto index = mru_index(key);
if (index == -1)
throw MRUError("Invalid key value");
return mru[index];
}
void MRUManager::Add(const char *key, agi::fs::path const& entry) {
MRUListMap &map = Find(key);
auto it = find(begin(map), end(map), entry);
if (it == begin(map) && it != end(map))
return;
if (it != end(map))
rotate(begin(map), it, it + 1);
else {
map.insert(begin(map), entry);
Prune(key, map);
}
Flush();
}
void MRUManager::Remove(const char *key, agi::fs::path const& entry) {
auto& map = Find(key);
map.erase(remove(begin(map), end(map), entry), end(map));
Flush();
}
const MRUManager::MRUListMap* MRUManager::Get(const char *key) {
return &Find(key);
}
agi::fs::path const& MRUManager::GetEntry(const char *key, const size_t entry) {
const auto map = Get(key);
if (entry >= map->size())
throw MRUError("Requested element index is out of range.");
return *next(map->begin(), entry);
}
void MRUManager::Flush() {
json::Object out;
for (size_t i = 0; i < mru.size(); ++i) {
json::Array &array = out[mru_names[i]];
for (auto const& p : mru[i])
array.push_back(p.string());
}
agi::JsonWriter::Write(out, io::Save(config_name).Get());
}
void MRUManager::Prune(const char *key, MRUListMap& map) const {
size_t limit = 16u;
if (options) {
int idx = mru_index(key);
if (idx != -1)
limit = (size_t)options->Get(option_names[idx])->GetInt();
}
map.resize(std::min(limit, map.size()));
}
void MRUManager::Load(const char *key, const json::Array& array) {
int idx = mru_index(key);
if (idx == -1) return;
try {
mru[idx].reserve(array.size());
for (std::string const& str : array)
mru[idx].push_back(str);
}
catch (json::Exception const&) {
// Out of date MRU file; just discard the data and skip it
}
Prune(key, mru[idx]);
}
}