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 "jthread/jmutexautolock.h"
#include "strfnd.h"
#include <iostream>
#include <fstream>
#include <sstream>
#include "debug.h"
#include "log.h"
#include "util/serialize.h"
#include "filesys.h"
#include <cctype>
Settings & Settings::operator += (const Settings &other)
{
update(other);
return *this;
}
Settings & Settings::operator = (const Settings &other)
{
if (&other == this)
return *this;
JMutexAutoLock lock(m_mutex);
JMutexAutoLock lock2(other.m_mutex);
clearNoLock();
updateNoLock(other);
return *this;
}
bool Settings::parseConfigLines(std::istream &is,
const std::string &end)
{
JMutexAutoLock lock(m_mutex);
std::string name, value;
bool end_found = false;
while (is.good() && !end_found) {
if (parseConfigObject(is, name, value, end, end_found)) {
m_settings[name] = value;
}
}
if (!end.empty() && !end_found) {
return false;
}
return true;
}
bool Settings::readConfigFile(const char *filename)
{
std::ifstream is(filename);
if (!is.good())
return false;
JMutexAutoLock lock(m_mutex);
std::string name, value;
while (is.good()) {
if (parseConfigObject(is, name, value)) {
m_settings[name] = value;
}
}
return true;
}
void Settings::writeLines(std::ostream &os) const
{
JMutexAutoLock lock(m_mutex);
for (std::map<std::string, std::string>::const_iterator
i = m_settings.begin();
i != m_settings.end(); ++i) {
os << i->first << " = " << i->second << '\n';
}
}
bool Settings::updateConfigFile(const char *filename)
{
std::list<std::string> objects;
std::set<std::string> updated;
bool changed = false;
JMutexAutoLock lock(m_mutex);
// Read the file and check for differences
{
std::ifstream is(filename);
while (is.good()) {
getUpdatedConfigObject(is, objects,
updated, changed);
}
}
// If something not yet determined to have been changed, check if
// any new stuff was added
if (!changed) {
for (std::map<std::string, std::string>::const_iterator
i = m_settings.begin();
i != m_settings.end(); ++i) {
if (updated.find(i->first) == updated.end()) {
changed = true;
break;
}
}
}
// If nothing was actually changed, skip writing the file
if (!changed) {
return true;
}
// Write stuff back
{
std::ostringstream ss(std::ios_base::binary);
// Write changes settings
for (std::list<std::string>::const_iterator
i = objects.begin();
i != objects.end(); ++i) {
ss << (*i);
}
// Write new settings
for (std::map<std::string, std::string>::const_iterator
i = m_settings.begin();
i != m_settings.end(); ++i) {
if (updated.find(i->first) != updated.end())
continue;
ss << i->first << " = " << i->second << '\n';
}
if (!fs::safeWriteToFile(filename, ss.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 *
***********/
std::string Settings::get(const std::string &name) const
{
JMutexAutoLock lock(m_mutex);
std::map<std::string, std::string>::const_iterator n;
if ((n = m_settings.find(name)) == m_settings.end()) {
if ((n = m_defaults.find(name)) == m_defaults.end()) {
throw SettingNotFoundException("Setting [" + name + "] not found.");
}
}
return n->second;
}
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);
}
s32 Settings::getS32(const std::string &name) const
{
return stoi(get(name));
}
float Settings::getFloat(const std::string &name) const
{
return stof(get(name));
}
u64 Settings::getU64(const std::string &name) const
{
u64 value = 0;
std::string s = get(name);
std::istringstream ss(s);
ss >> value;
return value;
}
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
{
std::string val = get(name);
return std::isdigit(val[0])
? stoi(val)
: readFlagString(val, flagdesc, flagmask);
}
// N.B. if getStruct() is used to read a non-POD aggregate type,
// the behavior is undefined.
bool Settings::getStruct(const std::string &name, const std::string &format,
void *out, size_t olen) const
{
std::string valstr;
try {
valstr = get(name);
} catch (SettingNotFoundException &e) {
return false;
}
if (!deSerializeStringToStruct(valstr, format, out, olen))
return false;
return true;
}
bool Settings::exists(const std::string &name) const
{
JMutexAutoLock lock(m_mutex);
return (m_settings.find(name) != m_settings.end() ||
m_defaults.find(name) != m_defaults.end());
}
std::vector<std::string> Settings::getNames() const
{
std::vector<std::string> names;
for (std::map<std::string, std::string>::const_iterator
i = m_settings.begin();
i != m_settings.end(); ++i) {
names.push_back(i->first);
}
return names;
}
/***************************************
* Getters that don't throw exceptions *
***************************************/
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::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;
}
}
// N.B. getFlagStrNoEx() does not set val, but merely modifies it. Thus,
// val must be initialized before using getFlagStrNoEx(). The intention of
// this is to simplify modifying a flags field from a default value.
bool Settings::getFlagStrNoEx(const std::string &name, u32 &val, FlagDesc *flagdesc) const
{
try {
u32 flags, flagmask;
flags = getFlagStr(name, flagdesc, &flagmask);
val &= ~flagmask;
val |= flags;
return true;
} catch (SettingNotFoundException &e) {
return false;
}
}
/***********
* Setters *
***********/
void Settings::set(const std::string &name, std::string value)
{
JMutexAutoLock lock(m_mutex);
m_settings[name] = value;
}
void Settings::set(const std::string &name, const char *value)
{
JMutexAutoLock lock(m_mutex);
m_settings[name] = value;
}
void Settings::setDefault(const std::string &name, std::string value)
{
JMutexAutoLock lock(m_mutex);
m_defaults[name] = value;
}
void Settings::setBool(const std::string &name, bool value)
{
set(name, value ? "true" : "false");
}
void Settings::setS16(const std::string &name, s16 value)
{
set(name, itos(value));
}
void Settings::setS32(const std::string &name, s32 value)
{
set(name, itos(value));
}
void Settings::setU64(const std::string &name, u64 value)
{
std::ostringstream os;
os << value;
set(name, os.str());
}
void Settings::setFloat(const std::string &name, float value)
{
set(name, ftos(value));
}
void Settings::setV2F(const std::string &name, v2f value)
{
std::ostringstream os;
os << "(" << value.X << "," << value.Y << ")";
set(name, os.str());
}
void Settings::setV3F(const std::string &name, v3f value)
{
std::ostringstream os;
os << "(" << value.X << "," << value.Y << "," << value.Z << ")";
set(name, os.str());
}
void Settings::setFlagStr(const std::string &name, u32 flags,
const FlagDesc *flagdesc, u32 flagmask)
{
set(name, writeFlagString(flags, flagdesc, flagmask));
}
bool Settings::setStruct(const std::string &name, const std::string &format, void *value)
{
std::string structstr;
if (!serializeStructToString(&structstr, format, value))
return false;
set(name, structstr);
return true;
}
bool Settings::remove(const std::string &name)
{
JMutexAutoLock lock(m_mutex);
return m_settings.erase(name);
}
void Settings::clear()
{
JMutexAutoLock lock(m_mutex);
clearNoLock();
}
void Settings::updateValue(const Settings &other, const std::string &name)
{
if (&other == this)
return;
JMutexAutoLock lock(m_mutex);
try {
std::string val = other.get(name);
m_settings[name] = val;
} catch (SettingNotFoundException &e) {
}
}
void Settings::update(const Settings &other)
{
if (&other == this)
return;
JMutexAutoLock lock(m_mutex);
JMutexAutoLock lock2(other.m_mutex);
updateNoLock(other);
}
inline bool Settings::parseConfigObject(std::istream &is,
std::string &name, std::string &value)
{
bool end_found = false;
return parseConfigObject(is, name, value, "", end_found);
}
// NOTE: This function might be expanded to allow multi-line settings.
bool Settings::parseConfigObject(std::istream &is,
std::string &name, std::string &value,
const std::string &end, bool &end_found)
{
std::string line;
std::getline(is, line);
std::string trimmed_line = trim(line);
// Ignore empty lines and comments
if (trimmed_line.empty() || trimmed_line[0] == '#') {
value = trimmed_line;
return false;
}
if (trimmed_line == end) {
end_found = true;
return false;
}
Strfnd sf(trimmed_line);
name = trim(sf.next("="));
if (name.empty()) {
value = trimmed_line;
return false;
}
value = trim(sf.next("\n"));
return true;
}
void Settings::getUpdatedConfigObject(std::istream &is,
std::list<std::string> &dst,
std::set<std::string> &updated,
bool &changed)
{
std::string name, value;
if (!parseConfigObject(is, name, value)) {
dst.push_back(value + (is.eof() ? "" : "\n"));
return;
}
if (m_settings.find(name) != m_settings.end()) {
std::string new_value = m_settings[name];
if (new_value != value) {
changed = true;
}
dst.push_back(name + " = " + new_value + (is.eof() ? "" : "\n"));
updated.insert(name);
} else { // File contains a setting which is not in m_settings
changed = true;
}
}
void Settings::updateNoLock(const Settings &other)
{
m_settings.insert(other.m_settings.begin(), other.m_settings.end());
m_defaults.insert(other.m_defaults.begin(), other.m_defaults.end());
}
void Settings::clearNoLock()
{
m_settings.clear();
m_defaults.clear();
}