minetest/src/settings.cpp

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/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "settings.h"
#include "irrlichttypes_bloated.h"
#include "exceptions.h"
#include "threading/mutex_auto_lock.h"
#include "util/numeric.h" // rangelim
#include "util/strfnd.h"
#include <iostream>
#include <fstream>
#include <sstream>
#include "debug.h"
#include "log.h"
#include "util/serialize.h"
#include "filesys.h"
#include "noise.h"
#include <cctype>
#include <algorithm>
Settings *g_settings = nullptr;
static SettingsHierarchy g_hierarchy;
std::string g_settings_path;
std::unordered_map<std::string, const FlagDesc *> Settings::s_flags;
/* Settings hierarchy implementation */
SettingsHierarchy::SettingsHierarchy(Settings *fallback)
{
layers.push_back(fallback);
}
Settings *SettingsHierarchy::getLayer(int layer) const
{
if (layer < 0 || layer >= (int)layers.size())
throw BaseException("Invalid settings layer");
return layers[layer];
}
Settings *SettingsHierarchy::getParent(int layer) const
{
assert(layer >= 0 && layer < (int)layers.size());
// iterate towards the origin (0) to find the next fallback layer
for (int i = layer - 1; i >= 0; --i) {
if (layers[i])
return layers[i];
}
return nullptr;
}
void SettingsHierarchy::onLayerCreated(int layer, Settings *obj)
{
if (layer < 0)
throw BaseException("Invalid settings layer");
if ((int)layers.size() < layer + 1)
layers.resize(layer + 1);
Settings *&pos = layers[layer];
if (pos)
throw BaseException("Setting layer " + itos(layer) + " already exists");
pos = obj;
// This feels bad
if (this == &g_hierarchy && layer == (int)SL_GLOBAL)
g_settings = obj;
}
void SettingsHierarchy::onLayerRemoved(int layer)
{
assert(layer >= 0 && layer < (int)layers.size());
layers[layer] = nullptr;
if (this == &g_hierarchy && layer == (int)SL_GLOBAL)
g_settings = nullptr;
}
/* Settings implementation */
Settings *Settings::createLayer(SettingsLayer sl, const std::string &end_tag)
{
return new Settings(end_tag, &g_hierarchy, (int)sl);
}
Settings *Settings::getLayer(SettingsLayer sl)
{
return g_hierarchy.getLayer(sl);
}
Settings::Settings(const std::string &end_tag, SettingsHierarchy *h,
int settings_layer) :
m_end_tag(end_tag),
m_hierarchy(h),
m_settingslayer(settings_layer)
{
if (m_hierarchy)
m_hierarchy->onLayerCreated(m_settingslayer, this);
}
Settings::~Settings()
{
MutexAutoLock lock(m_mutex);
if (m_hierarchy)
m_hierarchy->onLayerRemoved(m_settingslayer);
clearNoLock();
}
Settings & Settings::operator = (const Settings &other)
{
if (&other == this)
return *this;
// TODO: Avoid copying Settings objects. Make this private.
FATAL_ERROR_IF(m_hierarchy || other.m_hierarchy,
"Cannot copy or overwrite Settings object that belongs to a hierarchy");
MutexAutoLock lock(m_mutex);
MutexAutoLock lock2(other.m_mutex);
clearNoLock();
m_settings = other.m_settings;
m_callbacks = other.m_callbacks;
return *this;
}
bool Settings::checkNameValid(const std::string &name)
{
bool valid = name.find_first_of("=\"{}#") == std::string::npos;
if (valid)
valid = std::find_if(name.begin(), name.end(), ::isspace) == name.end();
if (!valid) {
errorstream << "Invalid setting name \"" << name << "\""
<< std::endl;
return false;
}
return true;
}
bool Settings::checkValueValid(const std::string &value)
{
if (value.substr(0, 3) == "\"\"\"" ||
value.find("\n\"\"\"") != std::string::npos) {
errorstream << "Invalid character sequence '\"\"\"' found in"
" setting value!" << std::endl;
return false;
}
return true;
}
std::string Settings::getMultiline(std::istream &is, size_t *num_lines)
{
size_t lines = 1;
std::string value;
std::string line;
while (is.good()) {
lines++;
std::getline(is, line);
if (line == "\"\"\"")
break;
value += line;
value.push_back('\n');
}
size_t len = value.size();
if (len)
value.erase(len - 1);
if (num_lines)
*num_lines = lines;
return value;
}
bool Settings::readConfigFile(const char *filename)
{
std::ifstream is(filename);
if (!is.good())
return false;
return parseConfigLines(is);
}
bool Settings::parseConfigLines(std::istream &is)
{
MutexAutoLock lock(m_mutex);
std::string line, name, value;
while (is.good()) {
std::getline(is, line);
SettingsParseEvent event = parseConfigObject(line, name, value);
switch (event) {
case SPE_NONE:
case SPE_INVALID:
case SPE_COMMENT:
break;
case SPE_KVPAIR:
m_settings[name] = SettingsEntry(value);
break;
case SPE_END:
return true;
case SPE_GROUP: {
Settings *group = new Settings("}");
if (!group->parseConfigLines(is)) {
delete group;
return false;
}
m_settings[name] = SettingsEntry(group);
break;
}
case SPE_MULTILINE:
m_settings[name] = SettingsEntry(getMultiline(is));
break;
}
}
// false (failure) if end tag not found
return m_end_tag.empty();
}
void Settings::writeLines(std::ostream &os, u32 tab_depth) const
{
MutexAutoLock lock(m_mutex);
for (const auto &setting_it : m_settings)
printEntry(os, setting_it.first, setting_it.second, tab_depth);
// For groups this must be "}" !
if (!m_end_tag.empty()) {
for (u32 i = 0; i < tab_depth; i++)
os << "\t";
os << m_end_tag << "\n";
}
}
void Settings::printEntry(std::ostream &os, const std::string &name,
const SettingsEntry &entry, u32 tab_depth)
{
for (u32 i = 0; i != tab_depth; i++)
os << "\t";
if (entry.is_group) {
os << name << " = {\n";
entry.group->writeLines(os, tab_depth + 1);
// Closing bracket handled by writeLines
} else {
os << name << " = ";
if (entry.value.find('\n') != std::string::npos)
os << "\"\"\"\n" << entry.value << "\n\"\"\"\n";
else
os << entry.value << "\n";
}
}
bool Settings::updateConfigObject(std::istream &is, std::ostream &os, u32 tab_depth)
{
SettingEntries::const_iterator it;
std::set<std::string> present_entries;
std::string line, name, value;
bool was_modified = false;
bool end_found = false;
// Add any settings that exist in the config file with the current value
// in the object if existing
while (is.good() && !end_found) {
std::getline(is, line);
SettingsParseEvent event = parseConfigObject(line, name, value);
switch (event) {
case SPE_END:
// Skip end tag. Append later.
end_found = true;
break;
case SPE_MULTILINE:
value = getMultiline(is);
/* FALLTHROUGH */
case SPE_KVPAIR:
it = m_settings.find(name);
if (it != m_settings.end() &&
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(it->second.is_group || it->second.value != value)) {
printEntry(os, name, it->second, tab_depth);
was_modified = true;
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} else if (it == m_settings.end()) {
// Remove by skipping
was_modified = true;
break;
} else {
os << line << "\n";
if (event == SPE_MULTILINE)
os << value << "\n\"\"\"\n";
}
present_entries.insert(name);
break;
case SPE_GROUP:
it = m_settings.find(name);
if (it != m_settings.end() && it->second.is_group) {
os << line << "\n";
sanity_check(it->second.group != NULL);
was_modified |= it->second.group->updateConfigObject(is, os, tab_depth + 1);
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} else if (it == m_settings.end()) {
// Remove by skipping
was_modified = true;
Settings removed_group("}"); // Move 'is' to group end
std::stringstream ss;
removed_group.updateConfigObject(is, ss, tab_depth + 1);
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break;
} else {
printEntry(os, name, it->second, tab_depth);
was_modified = true;
}
present_entries.insert(name);
break;
default:
os << line << (is.eof() ? "" : "\n");
break;
}
}
if (!line.empty() && is.eof())
os << "\n";
// Add any settings in the object that don't exist in the config file yet
for (it = m_settings.begin(); it != m_settings.end(); ++it) {
if (present_entries.find(it->first) != present_entries.end())
continue;
printEntry(os, it->first, it->second, tab_depth);
was_modified = true;
}
// Append ending tag
if (!m_end_tag.empty()) {
os << m_end_tag << "\n";
was_modified |= !end_found;
}
return was_modified;
}
bool Settings::updateConfigFile(const char *filename)
{
MutexAutoLock lock(m_mutex);
std::ifstream is(filename);
std::ostringstream os(std::ios_base::binary);
bool was_modified = updateConfigObject(is, os);
is.close();
if (!was_modified)
return true;
if (!fs::safeWriteToFile(filename, os.str())) {
errorstream << "Error writing configuration file: \""
<< filename << "\"" << std::endl;
return false;
}
return true;
}
bool Settings::parseCommandLine(int argc, char *argv[],
std::map<std::string, ValueSpec> &allowed_options)
{
int nonopt_index = 0;
for (int i = 1; i < argc; i++) {
std::string arg_name = argv[i];
if (arg_name.substr(0, 2) != "--") {
// If option doesn't start with -, read it in as nonoptX
if (arg_name[0] != '-'){
std::string name = "nonopt";
name += itos(nonopt_index);
set(name, arg_name);
nonopt_index++;
continue;
}
errorstream << "Invalid command-line parameter \""
<< arg_name << "\": --<option> expected." << std::endl;
return false;
}
std::string name = arg_name.substr(2);
std::map<std::string, ValueSpec>::iterator n;
n = allowed_options.find(name);
if (n == allowed_options.end()) {
errorstream << "Unknown command-line parameter \""
<< arg_name << "\"" << std::endl;
return false;
}
ValueType type = n->second.type;
std::string value;
if (type == VALUETYPE_FLAG) {
value = "true";
} else {
if ((i + 1) >= argc) {
errorstream << "Invalid command-line parameter \""
<< name << "\": missing value" << std::endl;
return false;
}
value = argv[++i];
}
set(name, value);
}
return true;
}
/***********
* Getters *
***********/
Settings *Settings::getParent() const
{
return m_hierarchy ? m_hierarchy->getParent(m_settingslayer) : nullptr;
}
const SettingsEntry &Settings::getEntry(const std::string &name) const
{
{
MutexAutoLock lock(m_mutex);
SettingEntries::const_iterator n;
if ((n = m_settings.find(name)) != m_settings.end())
return n->second;
}
if (auto parent = getParent())
return parent->getEntry(name);
throw SettingNotFoundException("Setting [" + name + "] not found.");
}
Settings *Settings::getGroup(const std::string &name) const
{
const SettingsEntry &entry = getEntry(name);
if (!entry.is_group)
throw SettingNotFoundException("Setting [" + name + "] is not a group.");
return entry.group;
}
const std::string &Settings::get(const std::string &name) const
{
const SettingsEntry &entry = getEntry(name);
if (entry.is_group)
throw SettingNotFoundException("Setting [" + name + "] is a group.");
return entry.value;
}
bool Settings::getBool(const std::string &name) const
{
return is_yes(get(name));
}
u16 Settings::getU16(const std::string &name) const
{
return stoi(get(name), 0, 65535);
}
s16 Settings::getS16(const std::string &name) const
{
return stoi(get(name), -32768, 32767);
}
u32 Settings::getU32(const std::string &name) const
{
return (u32) stoi(get(name));
}
s32 Settings::getS32(const std::string &name) const
{
return stoi(get(name));
}
float Settings::getFloat(const std::string &name) const
{
return stof(get(name));
}
float Settings::getFloat(const std::string &name, float min, float max) const
{
float val = stof(get(name));
return rangelim(val, min, max);
}
u64 Settings::getU64(const std::string &name) const
{
std::string s = get(name);
return from_string<u64>(s);
}
v2f Settings::getV2F(const std::string &name) const
{
v2f value;
Strfnd f(get(name));
f.next("(");
value.X = stof(f.next(","));
value.Y = stof(f.next(")"));
return value;
}
v3f Settings::getV3F(const std::string &name) const
{
v3f value;
Strfnd f(get(name));
f.next("(");
value.X = stof(f.next(","));
value.Y = stof(f.next(","));
value.Z = stof(f.next(")"));
return value;
}
u32 Settings::getFlagStr(const std::string &name, const FlagDesc *flagdesc,
u32 *flagmask) const
{
u32 flags = 0;
// Read default value (if there is any)
if (auto parent = getParent())
flags = parent->getFlagStr(name, flagdesc, flagmask);
// Apply custom flags "on top"
if (m_settings.find(name) != m_settings.end()) {
std::string value = get(name);
u32 flags_user;
u32 mask_user = U32_MAX;
flags_user = std::isdigit(value[0])
? stoi(value) // Override default
: readFlagString(value, flagdesc, &mask_user);
flags &= ~mask_user;
flags |= flags_user;
if (flagmask)
*flagmask |= mask_user;
}
return flags;
}
bool Settings::getNoiseParams(const std::string &name, NoiseParams &np) const
{
if (getNoiseParamsFromGroup(name, np) || getNoiseParamsFromValue(name, np))
return true;
if (auto parent = getParent())
return parent->getNoiseParams(name, np);
return false;
}
bool Settings::getNoiseParamsFromValue(const std::string &name,
NoiseParams &np) const
{
std::string value;
if (!getNoEx(name, value))
return false;
// Format: f32,f32,(f32,f32,f32),s32,s32,f32[,f32]
Strfnd f(value);
np.offset = stof(f.next(","));
np.scale = stof(f.next(","));
f.next("(");
np.spread.X = stof(f.next(","));
np.spread.Y = stof(f.next(","));
np.spread.Z = stof(f.next(")"));
f.next(",");
np.seed = stoi(f.next(","));
np.octaves = stoi(f.next(","));
np.persist = stof(f.next(","));
std::string optional_params = f.next("");
if (!optional_params.empty())
np.lacunarity = stof(optional_params);
return true;
}
bool Settings::getNoiseParamsFromGroup(const std::string &name,
NoiseParams &np) const
{
Settings *group = NULL;
if (!getGroupNoEx(name, group))
return false;
group->getFloatNoEx("offset", np.offset);
group->getFloatNoEx("scale", np.scale);
group->getV3FNoEx("spread", np.spread);
group->getS32NoEx("seed", np.seed);
group->getU16NoEx("octaves", np.octaves);
group->getFloatNoEx("persistence", np.persist);
group->getFloatNoEx("lacunarity", np.lacunarity);
np.flags = 0;
if (!group->getFlagStrNoEx("flags", np.flags, flagdesc_noiseparams))
np.flags = NOISE_FLAG_DEFAULTS;
return true;
}
bool Settings::exists(const std::string &name) const
{
if (existsLocal(name))
return true;
if (auto parent = getParent())
return parent->exists(name);
return false;
}
bool Settings::existsLocal(const std::string &name) const
{
MutexAutoLock lock(m_mutex);
return m_settings.find(name) != m_settings.end();
}
std::vector<std::string> Settings::getNames() const
{
MutexAutoLock lock(m_mutex);
std::vector<std::string> names;
names.reserve(m_settings.size());
for (const auto &settings_it : m_settings) {
names.push_back(settings_it.first);
}
return names;
}
/***************************************
* Getters that don't throw exceptions *
***************************************/
bool Settings::getGroupNoEx(const std::string &name, Settings *&val) const
{
try {
val = getGroup(name);
return true;
} catch (SettingNotFoundException &e) {
return false;
}
}
bool Settings::getNoEx(const std::string &name, std::string &val) const
{
try {
val = get(name);
return true;
} catch (SettingNotFoundException &e) {
return false;
}
}
bool Settings::getFlag(const std::string &name) const
{
try {
return getBool(name);
} catch(SettingNotFoundException &e) {
return false;
}
}
bool Settings::getFloatNoEx(const std::string &name, float &val) const
{
try {
val = getFloat(name);
return true;
} catch (SettingNotFoundException &e) {
return false;
}
}
bool Settings::getU16NoEx(const std::string &name, u16 &val) const
{
try {
val = getU16(name);
return true;
} catch (SettingNotFoundException &e) {
return false;
}
}
bool Settings::getS16NoEx(const std::string &name, s16 &val) const
{
try {
val = getS16(name);
return true;
} catch (SettingNotFoundException &e) {
return false;
}
}
bool Settings::getU32NoEx(const std::string &name, u32 &val) const
{
try {
val = getU32(name);
return true;
} catch (SettingNotFoundException &e) {
return false;
}
}
bool Settings::getS32NoEx(const std::string &name, s32 &val) const
{
try {
val = getS32(name);
return true;
} catch (SettingNotFoundException &e) {
return false;
}
}
bool Settings::getU64NoEx(const std::string &name, u64 &val) const
{
try {
val = getU64(name);
return true;
} catch (SettingNotFoundException &e) {
return false;
}
}
bool Settings::getV2FNoEx(const std::string &name, v2f &val) const
{
try {
val = getV2F(name);
return true;
} catch (SettingNotFoundException &e) {
return false;
}
}
bool Settings::getV3FNoEx(const std::string &name, v3f &val) const
{
try {
val = getV3F(name);
return true;
} catch (SettingNotFoundException &e) {
return false;
}
}
bool Settings::getFlagStrNoEx(const std::string &name, u32 &val,
const FlagDesc *flagdesc) const
{
if (!flagdesc) {
if (!(flagdesc = getFlagDescFallback(name)))
return false; // Not found
}
try {
val = getFlagStr(name, flagdesc, nullptr);
return true;
} catch (SettingNotFoundException &e) {
return false;
}
}
/***********
* Setters *
***********/
bool Settings::setEntry(const std::string &name, const void *data,
bool set_group)
{
if (!checkNameValid(name))
return false;
if (!set_group && !checkValueValid(*(const std::string *)data))
return false;
Settings *old_group = NULL;
{
MutexAutoLock lock(m_mutex);
SettingsEntry &entry = m_settings[name];
old_group = entry.group;
entry.value = set_group ? "" : *(const std::string *)data;
entry.group = set_group ? *(Settings **)data : NULL;
entry.is_group = set_group;
if (set_group)
entry.group->m_end_tag = "}";
}
delete old_group;
return true;
}
bool Settings::set(const std::string &name, const std::string &value)
{
if (!setEntry(name, &value, false))
return false;
doCallbacks(name);
return true;
}
// TODO: Remove this function
bool Settings::setDefault(const std::string &name, const std::string &value)
{
FATAL_ERROR_IF(m_hierarchy != &g_hierarchy, "setDefault is only valid on "
"global settings");
return getLayer(SL_DEFAULTS)->set(name, value);
}
bool Settings::setGroup(const std::string &name, const Settings &group)
{
// Settings must own the group pointer
// avoid double-free by copying the source
Settings *copy = new Settings();
*copy = group;
return setEntry(name, &copy, true);
}
bool Settings::setBool(const std::string &name, bool value)
{
return set(name, value ? "true" : "false");
}
bool Settings::setS16(const std::string &name, s16 value)
{
return set(name, itos(value));
}
bool Settings::setU16(const std::string &name, u16 value)
{
return set(name, itos(value));
}
bool Settings::setS32(const std::string &name, s32 value)
{
return set(name, itos(value));
}
bool Settings::setU64(const std::string &name, u64 value)
{
std::ostringstream os;
os << value;
return set(name, os.str());
}
bool Settings::setFloat(const std::string &name, float value)
{
return set(name, ftos(value));
}
bool Settings::setV2F(const std::string &name, v2f value)
{
std::ostringstream os;
os << "(" << value.X << "," << value.Y << ")";
return set(name, os.str());
}
bool Settings::setV3F(const std::string &name, v3f value)
{
std::ostringstream os;
os << "(" << value.X << "," << value.Y << "," << value.Z << ")";
return set(name, os.str());
}
bool Settings::setFlagStr(const std::string &name, u32 flags,
const FlagDesc *flagdesc, u32 flagmask)
{
if (!flagdesc) {
if (!(flagdesc = getFlagDescFallback(name)))
return false; // Not found
}
return set(name, writeFlagString(flags, flagdesc, flagmask));
}
bool Settings::setNoiseParams(const std::string &name, const NoiseParams &np)
{
Settings *group = new Settings;
group->setFloat("offset", np.offset);
group->setFloat("scale", np.scale);
group->setV3F("spread", np.spread);
group->setS32("seed", np.seed);
group->setU16("octaves", np.octaves);
group->setFloat("persistence", np.persist);
group->setFloat("lacunarity", np.lacunarity);
group->setFlagStr("flags", np.flags, flagdesc_noiseparams, np.flags);
return setEntry(name, &group, true);
}
bool Settings::remove(const std::string &name)
{
// Lock as short as possible, unlock before doCallbacks()
m_mutex.lock();
SettingEntries::iterator it = m_settings.find(name);
if (it != m_settings.end()) {
delete it->second.group;
m_settings.erase(it);
m_mutex.unlock();
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doCallbacks(name);
return true;
}
m_mutex.unlock();
return false;
}
SettingsParseEvent Settings::parseConfigObject(const std::string &line,
std::string &name, std::string &value)
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{
std::string trimmed_line = trim(line);
if (trimmed_line.empty())
return SPE_NONE;
if (trimmed_line[0] == '#')
return SPE_COMMENT;
if (trimmed_line == m_end_tag)
return SPE_END;
size_t pos = trimmed_line.find('=');
if (pos == std::string::npos)
return SPE_INVALID;
name = trim(trimmed_line.substr(0, pos));
value = trim(trimmed_line.substr(pos + 1));
if (value == "{")
return SPE_GROUP;
if (value == "\"\"\"")
return SPE_MULTILINE;
return SPE_KVPAIR;
}
void Settings::clearNoLock()
{
for (SettingEntries::const_iterator it = m_settings.begin();
it != m_settings.end(); ++it)
delete it->second.group;
m_settings.clear();
}
void Settings::setDefault(const std::string &name, const FlagDesc *flagdesc,
u32 flags)
{
s_flags[name] = flagdesc;
setDefault(name, writeFlagString(flags, flagdesc, U32_MAX));
}
const FlagDesc *Settings::getFlagDescFallback(const std::string &name) const
{
auto it = s_flags.find(name);
return it == s_flags.end() ? nullptr : it->second;
}
void Settings::registerChangedCallback(const std::string &name,
SettingsChangedCallback cbf, void *userdata)
{
MutexAutoLock lock(m_callback_mutex);
m_callbacks[name].emplace_back(cbf, userdata);
}
void Settings::deregisterChangedCallback(const std::string &name,
SettingsChangedCallback cbf, void *userdata)
{
MutexAutoLock lock(m_callback_mutex);
SettingsCallbackMap::iterator it_cbks = m_callbacks.find(name);
if (it_cbks != m_callbacks.end()) {
SettingsCallbackList &cbks = it_cbks->second;
SettingsCallbackList::iterator position =
std::find(cbks.begin(), cbks.end(), std::make_pair(cbf, userdata));
if (position != cbks.end())
cbks.erase(position);
}
}
void Settings::removeSecureSettings()
{
for (const auto &name : getNames()) {
if (name.compare(0, 7, "secure.") != 0)
continue;
errorstream << "Secure setting " << name
<< " isn't allowed, so was ignored."
<< std::endl;
remove(name);
}
}
void Settings::doCallbacks(const std::string &name) const
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{
MutexAutoLock lock(m_callback_mutex);
SettingsCallbackMap::const_iterator it_cbks = m_callbacks.find(name);
if (it_cbks != m_callbacks.end()) {
SettingsCallbackList::const_iterator it;
for (it = it_cbks->second.begin(); it != it_cbks->second.end(); ++it)
(it->first)(name, it->second);
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}
}