script_info.cpp

Go to the documentation of this file.
00001 /* $Id$ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD 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, version 2.
00006  * OpenTTD 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.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #include "../stdafx.h"
00013 #include "../settings_type.h"
00014 
00015 #include "squirrel_helper.hpp"
00016 
00017 #include "script_info.hpp"
00018 #include "script_scanner.hpp"
00019 
00020 ScriptInfo::~ScriptInfo()
00021 {
00022   /* Free all allocated strings */
00023   for (ScriptConfigItemList::iterator it = this->config_list.begin(); it != this->config_list.end(); it++) {
00024     free((*it).name);
00025     free((*it).description);
00026     if (it->labels != NULL) {
00027       for (LabelMapping::iterator it2 = (*it).labels->Begin(); it2 != (*it).labels->End(); it2++) {
00028         free(it2->second);
00029       }
00030       delete it->labels;
00031     }
00032   }
00033   this->config_list.clear();
00034 
00035   free(this->author);
00036   free(this->name);
00037   free(this->short_name);
00038   free(this->description);
00039   free(this->date);
00040   free(this->instance_name);
00041   free(this->url);
00042   free(this->main_script);
00043   free(this->tar_file);
00044   free(this->SQ_instance);
00045 }
00046 
00047 bool ScriptInfo::CheckMethod(const char *name) const
00048 {
00049   if (!this->engine->MethodExists(*this->SQ_instance, name)) {
00050     char error[1024];
00051     snprintf(error, sizeof(error), "your info.nut/library.nut doesn't have the method '%s'", name);
00052     this->engine->ThrowError(error);
00053     return false;
00054   }
00055   return true;
00056 }
00057 
00058 /* static */ SQInteger ScriptInfo::Constructor(HSQUIRRELVM vm, ScriptInfo *info)
00059 {
00060   /* Set some basic info from the parent */
00061   info->SQ_instance = MallocT<SQObject>(1);
00062   Squirrel::GetInstance(vm, info->SQ_instance, 2);
00063   /* Make sure the instance stays alive over time */
00064   sq_addref(vm, info->SQ_instance);
00065 
00066   info->scanner = (ScriptScanner *)Squirrel::GetGlobalPointer(vm);
00067   info->engine = info->scanner->GetEngine();
00068 
00069   /* Ensure the mandatory functions exist */
00070   static const char * const required_functions[] = {
00071     "GetAuthor",
00072     "GetName",
00073     "GetShortName",
00074     "GetDescription",
00075     "GetVersion",
00076     "GetDate",
00077     "CreateInstance",
00078   };
00079   for (size_t i = 0; i < lengthof(required_functions); i++) {
00080     if (!info->CheckMethod(required_functions[i])) return SQ_ERROR;
00081   }
00082 
00083   /* Get location information of the scanner */
00084   info->main_script = strdup(info->scanner->GetMainScript());
00085   const char *tar_name = info->scanner->GetTarFile();
00086   if (tar_name != NULL) info->tar_file = strdup(tar_name);
00087 
00088   /* Cache the data the info file gives us. */
00089   if (!info->engine->CallStringMethodStrdup(*info->SQ_instance, "GetAuthor", &info->author, MAX_GET_OPS)) return SQ_ERROR;
00090   if (!info->engine->CallStringMethodStrdup(*info->SQ_instance, "GetName", &info->name, MAX_GET_OPS)) return SQ_ERROR;
00091   if (!info->engine->CallStringMethodStrdup(*info->SQ_instance, "GetShortName", &info->short_name, MAX_GET_OPS)) return SQ_ERROR;
00092   if (!info->engine->CallStringMethodStrdup(*info->SQ_instance, "GetDescription", &info->description, MAX_GET_OPS)) return SQ_ERROR;
00093   if (!info->engine->CallStringMethodStrdup(*info->SQ_instance, "GetDate", &info->date, MAX_GET_OPS)) return SQ_ERROR;
00094   if (!info->engine->CallIntegerMethod(*info->SQ_instance, "GetVersion", &info->version, MAX_GET_OPS)) return SQ_ERROR;
00095   if (!info->engine->CallStringMethodStrdup(*info->SQ_instance, "CreateInstance", &info->instance_name, MAX_CREATEINSTANCE_OPS)) return SQ_ERROR;
00096 
00097   /* The GetURL function is optional. */
00098   if (info->engine->MethodExists(*info->SQ_instance, "GetURL")) {
00099     if (!info->engine->CallStringMethodStrdup(*info->SQ_instance, "GetURL", &info->url, MAX_GET_OPS)) return SQ_ERROR;
00100   }
00101 
00102   /* Check if we have settings */
00103   if (info->engine->MethodExists(*info->SQ_instance, "GetSettings")) {
00104     if (!info->GetSettings()) return SQ_ERROR;
00105   }
00106 
00107   return 0;
00108 }
00109 
00110 bool ScriptInfo::GetSettings()
00111 {
00112   return this->engine->CallMethod(*this->SQ_instance, "GetSettings", NULL, MAX_GET_SETTING_OPS);
00113 }
00114 
00115 SQInteger ScriptInfo::AddSetting(HSQUIRRELVM vm)
00116 {
00117   ScriptConfigItem config;
00118   memset(&config, 0, sizeof(config));
00119   config.max_value = 1;
00120   config.step_size = 1;
00121   uint items = 0;
00122 
00123   /* Read the table, and find all properties we care about */
00124   sq_pushnull(vm);
00125   while (SQ_SUCCEEDED(sq_next(vm, -2))) {
00126     const SQChar *sqkey;
00127     if (SQ_FAILED(sq_getstring(vm, -2, &sqkey))) return SQ_ERROR;
00128     const char *key = SQ2OTTD(sqkey);
00129 
00130     if (strcmp(key, "name") == 0) {
00131       const SQChar *sqvalue;
00132       if (SQ_FAILED(sq_getstring(vm, -1, &sqvalue))) return SQ_ERROR;
00133       char *name = strdup(SQ2OTTD(sqvalue));
00134       char *s;
00135       /* Don't allow '=' and ',' in configure setting names, as we need those
00136        *  2 chars to nicely store the settings as a string. */
00137       while ((s = strchr(name, '=')) != NULL) *s = '_';
00138       while ((s = strchr(name, ',')) != NULL) *s = '_';
00139       config.name = name;
00140       items |= 0x001;
00141     } else if (strcmp(key, "description") == 0) {
00142       const SQChar *sqdescription;
00143       if (SQ_FAILED(sq_getstring(vm, -1, &sqdescription))) return SQ_ERROR;
00144       config.description = strdup(SQ2OTTD(sqdescription));
00145       items |= 0x002;
00146     } else if (strcmp(key, "min_value") == 0) {
00147       SQInteger res;
00148       if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
00149       config.min_value = res;
00150       items |= 0x004;
00151     } else if (strcmp(key, "max_value") == 0) {
00152       SQInteger res;
00153       if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
00154       config.max_value = res;
00155       items |= 0x008;
00156     } else if (strcmp(key, "easy_value") == 0) {
00157       SQInteger res;
00158       if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
00159       config.easy_value = res;
00160       items |= 0x010;
00161     } else if (strcmp(key, "medium_value") == 0) {
00162       SQInteger res;
00163       if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
00164       config.medium_value = res;
00165       items |= 0x020;
00166     } else if (strcmp(key, "hard_value") == 0) {
00167       SQInteger res;
00168       if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
00169       config.hard_value = res;
00170       items |= 0x040;
00171     } else if (strcmp(key, "random_deviation") == 0) {
00172       SQInteger res;
00173       if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
00174       config.random_deviation = res;
00175       items |= 0x200;
00176     } else if (strcmp(key, "custom_value") == 0) {
00177       SQInteger res;
00178       if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
00179       config.custom_value = res;
00180       items |= 0x080;
00181     } else if (strcmp(key, "step_size") == 0) {
00182       SQInteger res;
00183       if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
00184       config.step_size = res;
00185     } else if (strcmp(key, "flags") == 0) {
00186       SQInteger res;
00187       if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
00188       config.flags = (ScriptConfigFlags)res;
00189       items |= 0x100;
00190     } else {
00191       char error[1024];
00192       snprintf(error, sizeof(error), "unknown setting property '%s'", key);
00193       this->engine->ThrowError(error);
00194       return SQ_ERROR;
00195     }
00196 
00197     sq_pop(vm, 2);
00198   }
00199   sq_pop(vm, 1);
00200 
00201   /* Don't allow both random_deviation and SCRIPTCONFIG_RANDOM to
00202    * be set for the same config item. */
00203   if ((items & 0x200) != 0 && (config.flags & SCRIPTCONFIG_RANDOM) != 0) {
00204     char error[1024];
00205     snprintf(error, sizeof(error), "Setting both random_deviation and SCRIPTCONFIG_RANDOM is not allowed");
00206     this->engine->ThrowError(error);
00207     return SQ_ERROR;
00208   }
00209   /* Reset the bit for random_deviation as it's optional. */
00210   items &= ~0x200;
00211 
00212   /* Make sure all properties are defined */
00213   uint mask = (config.flags & SCRIPTCONFIG_BOOLEAN) ? 0x1F3 : 0x1FF;
00214   if (items != mask) {
00215     char error[1024];
00216     snprintf(error, sizeof(error), "please define all properties of a setting (min/max not allowed for booleans)");
00217     this->engine->ThrowError(error);
00218     return SQ_ERROR;
00219   }
00220 
00221   this->config_list.push_back(config);
00222   return 0;
00223 }
00224 
00225 SQInteger ScriptInfo::AddLabels(HSQUIRRELVM vm)
00226 {
00227   const SQChar *sq_setting_name;
00228   if (SQ_FAILED(sq_getstring(vm, -2, &sq_setting_name))) return SQ_ERROR;
00229   const char *setting_name = SQ2OTTD(sq_setting_name);
00230 
00231   ScriptConfigItem *config = NULL;
00232   for (ScriptConfigItemList::iterator it = this->config_list.begin(); it != this->config_list.end(); it++) {
00233     if (strcmp((*it).name, setting_name) == 0) config = &(*it);
00234   }
00235 
00236   if (config == NULL) {
00237     char error[1024];
00238     snprintf(error, sizeof(error), "Trying to add labels for non-defined setting '%s'", setting_name);
00239     this->engine->ThrowError(error);
00240     return SQ_ERROR;
00241   }
00242   if (config->labels != NULL) return SQ_ERROR;
00243 
00244   config->labels = new LabelMapping;
00245 
00246   /* Read the table and find all labels */
00247   sq_pushnull(vm);
00248   while (SQ_SUCCEEDED(sq_next(vm, -2))) {
00249     const SQChar *sq_key;
00250     const SQChar *sq_label;
00251     if (SQ_FAILED(sq_getstring(vm, -2, &sq_key))) return SQ_ERROR;
00252     if (SQ_FAILED(sq_getstring(vm, -1, &sq_label))) return SQ_ERROR;
00253     /* Because squirrel doesn't support identifiers starting with a digit,
00254      * we skip the first character. */
00255     const char *key_string = SQ2OTTD(sq_key);
00256     int key = atoi(key_string + 1);
00257     const char *label = SQ2OTTD(sq_label);
00258 
00259     /* !Contains() prevents strdup from leaking. */
00260     if (!config->labels->Contains(key)) config->labels->Insert(key, strdup(label));
00261 
00262     sq_pop(vm, 2);
00263   }
00264   sq_pop(vm, 1);
00265 
00266   return 0;
00267 }
00268 
00269 const ScriptConfigItemList *ScriptInfo::GetConfigList() const
00270 {
00271   return &this->config_list;
00272 }
00273 
00274 const ScriptConfigItem *ScriptInfo::GetConfigItem(const char *name) const
00275 {
00276   for (ScriptConfigItemList::const_iterator it = this->config_list.begin(); it != this->config_list.end(); it++) {
00277     if (strcmp((*it).name, name) == 0) return &(*it);
00278   }
00279   return NULL;
00280 }
00281 
00282 int ScriptInfo::GetSettingDefaultValue(const char *name) const
00283 {
00284   for (ScriptConfigItemList::const_iterator it = this->config_list.begin(); it != this->config_list.end(); it++) {
00285     if (strcmp((*it).name, name) != 0) continue;
00286     /* The default value depends on the difficulty level */
00287     switch (GetGameSettings().difficulty.diff_level) {
00288       case 0: return (*it).easy_value;
00289       case 1: return (*it).medium_value;
00290       case 2: return (*it).hard_value;
00291       case 3: return (*it).custom_value;
00292       default: NOT_REACHED();
00293     }
00294   }
00295 
00296   /* There is no such setting */
00297   return -1;
00298 }