src/settings.h

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #ifndef SETTINGS_HEADER
  21 #define SETTINGS_HEADER
  22
  23 #include "irrlichttypes_bloated.h"
  24 #include <string>
  25 #include <jthread.h>
  26 #include <jmutex.h>
  27 #include <jmutexautolock.h>
  28 #include "strfnd.h"
  29 #include <iostream>
  30 #include <fstream>
  31 #include <sstream>
  32 #include "debug.h"
  33 #include "log.h"
  34 #include "util/string.h"
  35
  36 enum ValueType
  37 {
  38         VALUETYPE_STRING,
  39         VALUETYPE_FLAG // Doesn't take any arguments
  40 };
  41
  42 struct ValueSpec
  43 {
  44         ValueSpec(ValueType a_type, const char *a_help=NULL)
  45         {
  46                 type = a_type;
  47                 help = a_help;
  48         }
  49         ValueType type;
  50         const char *help;
  51 };
  52
  53 class Settings
  54 {
  55 public:
  56         Settings()
  57         {
  58                 m_mutex.Init();
  59         }
  60
  61         void writeLines(std::ostream &os)
  62         {
  63                 JMutexAutoLock lock(m_mutex);
  64
  65                 for(core::map<std::string, std::string>::Iterator
  66                                 i = m_settings.getIterator();
  67                                 i.atEnd() == false; i++)
  68                 {
  69                         std::string name = i.getNode()->getKey();
  70                         std::string value = i.getNode()->getValue();
  71                         os<<name<<" = "<<value<<"\n";
  72                 }
  73         }
  74
  75         // return all keys used
  76         std::vector<std::string> getNames(){
  77                 std::vector<std::string> names;
  78                 for(core::map<std::string, std::string>::Iterator
  79                                 i = m_settings.getIterator();
  80                                 i.atEnd() == false; i++)
  81                 {
  82                         std::string name = i.getNode()->getKey();
  83                         names.push_back(name);
  84                 }
  85                 return names;
  86         }
  87
  88         // remove a setting
  89         bool remove(const std::string& name)
  90         {
  91                 return m_settings.remove(name);
  92         }
  93
  94
  95         bool parseConfigLine(const std::string &line)
  96         {
  97                 JMutexAutoLock lock(m_mutex);
  98
  99                 std::string trimmedline = trim(line);
 100
 101                 // Ignore empty lines and comments
 102                 if(trimmedline.size() == 0 || trimmedline[0] == '#')
 103                         return true;
 104
 105                 //infostream<<"trimmedline=\""<<trimmedline<<"\""<<std::endl;
 106
 107                 Strfnd sf(trim(line));
 108
 109                 std::string name = sf.next("=");
 110                 name = trim(name);
 111
 112                 if(name == "")
 113                         return true;
 114
 115                 std::string value = sf.next("\n");
 116                 value = trim(value);
 117
 118                 /*infostream<<"Config name=\""<<name<<"\" value=\""
 119                                 <<value<<"\""<<std::endl;*/
 120
 121                 m_settings[name] = value;
 122
 123                 return true;
 124         }
 125
 126         void parseConfigLines(std::istream &is, const std::string &endstring)
 127         {
 128                 for(;;){
 129                         if(is.eof())
 130                                 break;
 131                         std::string line;
 132                         std::getline(is, line);
 133                         std::string trimmedline = trim(line);
 134                         if(endstring != ""){
 135                                 if(trimmedline == endstring)
 136                                         break;
 137                         }
 138                         parseConfigLine(line);
 139                 }
 140         }
 141
 142         // Returns false on EOF
 143         bool parseConfigObject(std::istream &is)
 144         {
 145                 if(is.eof())
 146                         return false;
 147
 148                 /*
 149                         NOTE: This function might be expanded to allow multi-line
 150                               settings.
 151                 */
 152                 std::string line;
 153                 std::getline(is, line);
 154                 //infostream<<"got line: \""<<line<<"\""<<std::endl;
 155
 156                 return parseConfigLine(line);
 157         }
 158
 159         /*
 160                 Read configuration file
 161
 162                 Returns true on success
 163         */
 164         bool readConfigFile(const char *filename)
 165         {
 166                 std::ifstream is(filename);
 167                 if(is.good() == false)
 168                         return false;
 169
 170                 /*infostream<<"Parsing configuration file: \""
 171                                 <<filename<<"\""<<std::endl;*/
 172
 173                 while(parseConfigObject(is));
 174
 175                 return true;
 176         }
 177
 178         /*
 179                 Reads a configuration object from stream (usually a single line)
 180                 and adds it to dst.
 181
 182                 Preserves comments and empty lines.
 183
 184                 Settings that were added to dst are also added to updated.
 185                 key of updated is setting name, value of updated is dummy.
 186
 187                 Returns false on EOF
 188         */
 189         bool getUpdatedConfigObject(std::istream &is,
 190                         core::list<std::string> &dst,
 191                         core::map<std::string, bool> &updated,
 192                         bool &value_changed)
 193         {
 194                 JMutexAutoLock lock(m_mutex);
 195
 196                 if(is.eof())
 197                         return false;
 198
 199                 // NOTE: This function will be expanded to allow multi-line settings
 200                 std::string line;
 201                 std::getline(is, line);
 202
 203                 std::string trimmedline = trim(line);
 204
 205                 std::string line_end = "";
 206                 if(is.eof() == false)
 207                         line_end = "\n";
 208
 209                 // Ignore empty lines and comments
 210                 if(trimmedline.size() == 0 || trimmedline[0] == '#')
 211                 {
 212                         dst.push_back(line+line_end);
 213                         return true;
 214                 }
 215
 216                 Strfnd sf(trim(line));
 217
 218                 std::string name = sf.next("=");
 219                 name = trim(name);
 220
 221                 if(name == "")
 222                 {
 223                         dst.push_back(line+line_end);
 224                         return true;
 225                 }
 226
 227                 std::string value = sf.next("\n");
 228                 value = trim(value);
 229
 230                 if(m_settings.find(name))
 231                 {
 232                         std::string newvalue = m_settings[name];
 233
 234                         if(newvalue != value)
 235                         {
 236                                 infostream<<"Changing value of \""<<name<<"\" = \""
 237                                                 <<value<<"\" -> \""<<newvalue<<"\""
 238                                                 <<std::endl;
 239                                 value_changed = true;
 240                         }
 241
 242                         dst.push_back(name + " = " + newvalue + line_end);
 243
 244                         updated[name] = true;
 245                 }
 246
 247                 return true;
 248         }
 249
 250         /*
 251                 Updates configuration file
 252
 253                 Returns true on success
 254         */
 255         bool updateConfigFile(const char *filename)
 256         {
 257                 infostream<<"Updating configuration file: \""
 258                                 <<filename<<"\""<<std::endl;
 259
 260                 core::list<std::string> objects;
 261                 core::map<std::string, bool> updated;
 262                 bool something_actually_changed = false;
 263
 264                 // Read and modify stuff
 265                 {
 266                         std::ifstream is(filename);
 267                         if(is.good() == false)
 268                         {
 269                                 infostream<<"updateConfigFile():"
 270                                                 " Error opening configuration file"
 271                                                 " for reading: \""
 272                                                 <<filename<<"\""<<std::endl;
 273                         }
 274                         else
 275                         {
 276                                 while(getUpdatedConfigObject(is, objects, updated,
 277                                                 something_actually_changed));
 278                         }
 279                 }
 280
 281                 JMutexAutoLock lock(m_mutex);
 282
 283                 // If something not yet determined to have been changed, check if
 284                 // any new stuff was added
 285                 if(!something_actually_changed){
 286                         for(core::map<std::string, std::string>::Iterator
 287                                         i = m_settings.getIterator();
 288                                         i.atEnd() == false; i++)
 289                         {
 290                                 if(updated.find(i.getNode()->getKey()))
 291                                         continue;
 292                                 something_actually_changed = true;
 293                                 break;
 294                         }
 295                 }
 296
 297                 // If nothing was actually changed, skip writing the file
 298                 if(!something_actually_changed){
 299                         infostream<<"Skipping writing of "<<filename
 300                                         <<" because content wouldn't be modified"<<std::endl;
 301                         return true;
 302                 }
 303
 304                 // Write stuff back
 305                 {
 306                         std::ofstream os(filename);
 307                         if(os.good() == false)
 308                         {
 309                                 errorstream<<"Error opening configuration file"
 310                                                 " for writing: \""
 311                                                 <<filename<<"\""<<std::endl;
 312                                 return false;
 313                         }
 314
 315                         /*
 316                                 Write updated stuff
 317                         */
 318                         for(core::list<std::string>::Iterator
 319                                         i = objects.begin();
 320                                         i != objects.end(); i++)
 321                         {
 322                                 os<<(*i);
 323                         }
 324
 325                         /*
 326                                 Write stuff that was not already in the file
 327                         */
 328                         for(core::map<std::string, std::string>::Iterator
 329                                         i = m_settings.getIterator();
 330                                         i.atEnd() == false; i++)
 331                         {
 332                                 if(updated.find(i.getNode()->getKey()))
 333                                         continue;
 334                                 std::string name = i.getNode()->getKey();
 335                                 std::string value = i.getNode()->getValue();
 336                                 infostream<<"Adding \""<<name<<"\" = \""<<value<<"\""
 337                                                 <<std::endl;
 338                                 os<<name<<" = "<<value<<"\n";
 339                         }
 340                 }
 341
 342                 return true;
 343         }
 344
 345         /*
 346                 NOTE: Types of allowed_options are ignored
 347
 348                 returns true on success
 349         */
 350         bool parseCommandLine(int argc, char *argv[],
 351                         core::map<std::string, ValueSpec> &allowed_options)
 352         {
 353                 int nonopt_index = 0;
 354                 int i=1;
 355                 for(;;)
 356                 {
 357                         if(i >= argc)
 358                                 break;
 359                         std::string argname = argv[i];
 360                         if(argname.substr(0, 2) != "--")
 361                         {
 362                                 // If option doesn't start with -, read it in as nonoptX
 363                                 if(argname[0] != '-'){
 364                                         std::string name = "nonopt";
 365                                         name += itos(nonopt_index);
 366                                         set(name, argname);
 367                                         nonopt_index++;
 368                                         i++;
 369                                         continue;
 370                                 }
 371                                 errorstream<<"Invalid command-line parameter \""
 372                                                 <<argname<<"\": --<option> expected."<<std::endl;
 373                                 return false;
 374                         }
 375                         i++;
 376
 377                         std::string name = argname.substr(2);
 378
 379                         core::map<std::string, ValueSpec>::Node *n;
 380                         n = allowed_options.find(name);
 381                         if(n == NULL)
 382                         {
 383                                 errorstream<<"Unknown command-line parameter \""
 384                                                 <<argname<<"\""<<std::endl;
 385                                 return false;
 386                         }
 387
 388                         ValueType type = n->getValue().type;
 389
 390                         std::string value = "";
 391
 392                         if(type == VALUETYPE_FLAG)
 393                         {
 394                                 value = "true";
 395                         }
 396                         else
 397                         {
 398                                 if(i >= argc)
 399                                 {
 400                                         errorstream<<"Invalid command-line parameter \""
 401                                                         <<name<<"\": missing value"<<std::endl;
 402                                         return false;
 403                                 }
 404                                 value = argv[i];
 405                                 i++;
 406                         }
 407
 408
 409                         infostream<<"Valid command-line parameter: \""
 410                                         <<name<<"\" = \""<<value<<"\""
 411                                         <<std::endl;
 412                         set(name, value);
 413                 }
 414
 415                 return true;
 416         }
 417
 418         void set(std::string name, std::string value)
 419         {
 420                 JMutexAutoLock lock(m_mutex);
 421
 422                 m_settings[name] = value;
 423         }
 424
 425         void set(std::string name, const char *value)
 426         {
 427                 JMutexAutoLock lock(m_mutex);
 428
 429                 m_settings[name] = value;
 430         }
 431
 432
 433         void setDefault(std::string name, std::string value)
 434         {
 435                 JMutexAutoLock lock(m_mutex);
 436
 437                 m_defaults[name] = value;
 438         }
 439
 440         bool exists(std::string name)
 441         {
 442                 JMutexAutoLock lock(m_mutex);
 443
 444                 return (m_settings.find(name) || m_defaults.find(name));
 445         }
 446
 447         std::string get(std::string name)
 448         {
 449                 JMutexAutoLock lock(m_mutex);
 450
 451                 core::map<std::string, std::string>::Node *n;
 452                 n = m_settings.find(name);
 453                 if(n == NULL)
 454                 {
 455                         n = m_defaults.find(name);
 456                         if(n == NULL)
 457                         {
 458                                 throw SettingNotFoundException("Setting not found");
 459                         }
 460                 }
 461
 462                 return n->getValue();
 463         }
 464
 465         bool getBool(std::string name)
 466         {
 467                 return is_yes(get(name));
 468         }
 469
 470         bool getFlag(std::string name)
 471         {
 472                 try
 473                 {
 474                         return getBool(name);
 475                 }
 476                 catch(SettingNotFoundException &e)
 477                 {
 478                         return false;
 479                 }
 480         }
 481
 482         // Asks if empty
 483         bool getBoolAsk(std::string name, std::string question, bool def)
 484         {
 485                 // If it is in settings
 486                 if(exists(name))
 487                         return getBool(name);
 488
 489                 std::string s;
 490                 char templine[10];
 491                 std::cout<<question<<" [y/N]: ";
 492                 std::cin.getline(templine, 10);
 493                 s = templine;
 494
 495                 if(s == "")
 496                         return def;
 497
 498                 return is_yes(s);
 499         }
 500
 501         float getFloat(std::string name)
 502         {
 503                 return stof(get(name));
 504         }
 505
 506         u16 getU16(std::string name)
 507         {
 508                 return stoi(get(name), 0, 65535);
 509         }
 510
 511         u16 getU16Ask(std::string name, std::string question, u16 def)
 512         {
 513                 // If it is in settings
 514                 if(exists(name))
 515                         return getU16(name);
 516
 517                 std::string s;
 518                 char templine[10];
 519                 std::cout<<question<<" ["<<def<<"]: ";
 520                 std::cin.getline(templine, 10);
 521                 s = templine;
 522
 523                 if(s == "")
 524                         return def;
 525
 526                 return stoi(s, 0, 65535);
 527         }
 528
 529         s16 getS16(std::string name)
 530         {
 531                 return stoi(get(name), -32768, 32767);
 532         }
 533
 534         s32 getS32(std::string name)
 535         {
 536                 return stoi(get(name));
 537         }
 538
 539         v3f getV3F(std::string name)
 540         {
 541                 v3f value;
 542                 Strfnd f(get(name));
 543                 f.next("(");
 544                 value.X = stof(f.next(","));
 545                 value.Y = stof(f.next(","));
 546                 value.Z = stof(f.next(")"));
 547                 return value;
 548         }
 549
 550         v2f getV2F(std::string name)
 551         {
 552                 v2f value;
 553                 Strfnd f(get(name));
 554                 f.next("(");
 555                 value.X = stof(f.next(","));
 556                 value.Y = stof(f.next(")"));
 557                 return value;
 558         }
 559
 560         u64 getU64(std::string name)
 561         {
 562                 u64 value = 0;
 563                 std::string s = get(name);
 564                 std::istringstream ss(s);
 565                 ss>>value;
 566                 return value;
 567         }
 568
 569         void setBool(std::string name, bool value)
 570         {
 571                 if(value)
 572                         set(name, "true");
 573                 else
 574                         set(name, "false");
 575         }
 576
 577
 578
 579         void setFloat(std::string name, float value)
 580         {
 581                 set(name, ftos(value));
 582         }
 583
 584         void setV3F(std::string name, v3f value)
 585         {
 586                 std::ostringstream os;
 587                 os<<"("<<value.X<<","<<value.Y<<","<<value.Z<<")";
 588                 set(name, os.str());
 589         }
 590
 591         void setV2F(std::string name, v2f value)
 592         {
 593                 std::ostringstream os;
 594                 os<<"("<<value.X<<","<<value.Y<<")";
 595                 set(name, os.str());
 596         }
 597
 598         void setS16(std::string name, s16 value)
 599         {
 600                 set(name, itos(value));
 601         }
 602
 603         void setS32(std::string name, s32 value)
 604         {
 605                 set(name, itos(value));
 606         }
 607
 608         void setU64(std::string name, u64 value)
 609         {
 610                 std::ostringstream os;
 611                 os<<value;
 612                 set(name, os.str());
 613         }
 614
 615         void clear()
 616         {
 617                 JMutexAutoLock lock(m_mutex);
 618
 619                 m_settings.clear();
 620                 m_defaults.clear();
 621         }
 622
 623         void updateValue(Settings &other, const std::string &name)
 624         {
 625                 JMutexAutoLock lock(m_mutex);
 626
 627                 if(&other == this)
 628                         return;
 629
 630                 try{
 631                         std::string val = other.get(name);
 632                         m_settings[name] = val;
 633                 } catch(SettingNotFoundException &e){
 634                 }
 635
 636                 return;
 637         }
 638
 639         void update(Settings &other)
 640         {
 641                 JMutexAutoLock lock(m_mutex);
 642                 JMutexAutoLock lock2(other.m_mutex);
 643
 644                 if(&other == this)
 645                         return;
 646
 647                 for(core::map<std::string, std::string>::Iterator
 648                                 i = other.m_settings.getIterator();
 649                                 i.atEnd() == false; i++)
 650                 {
 651                         m_settings[i.getNode()->getKey()] = i.getNode()->getValue();
 652                 }
 653
 654                 for(core::map<std::string, std::string>::Iterator
 655                                 i = other.m_defaults.getIterator();
 656                                 i.atEnd() == false; i++)
 657                 {
 658                         m_defaults[i.getNode()->getKey()] = i.getNode()->getValue();
 659                 }
 660
 661                 return;
 662         }
 663
 664         Settings & operator+=(Settings &other)
 665         {
 666                 JMutexAutoLock lock(m_mutex);
 667                 JMutexAutoLock lock2(other.m_mutex);
 668
 669                 if(&other == this)
 670                         return *this;
 671
 672                 for(core::map<std::string, std::string>::Iterator
 673                                 i = other.m_settings.getIterator();
 674                                 i.atEnd() == false; i++)
 675                 {
 676                         m_settings.insert(i.getNode()->getKey(),
 677                                         i.getNode()->getValue());
 678                 }
 679
 680                 for(core::map<std::string, std::string>::Iterator
 681                                 i = other.m_defaults.getIterator();
 682                                 i.atEnd() == false; i++)
 683                 {
 684                         m_defaults.insert(i.getNode()->getKey(),
 685                                         i.getNode()->getValue());
 686                 }
 687
 688                 return *this;
 689
 690         }
 691
 692         Settings & operator=(Settings &other)
 693         {
 694                 JMutexAutoLock lock(m_mutex);
 695                 JMutexAutoLock lock2(other.m_mutex);
 696
 697                 if(&other == this)
 698                         return *this;
 699
 700                 clear();
 701                 (*this) += other;
 702
 703                 return *this;
 704         }
 705
 706 private:
 707         core::map<std::string, std::string> m_settings;
 708         core::map<std::string, std::string> m_defaults;
 709         // All methods that access m_settings/m_defaults directly should lock this.
 710         JMutex m_mutex;
 711 };
 712
 713 #endif
 714