| 1 | // Copyright (C) 2006 Erik Dahlberg |
| 2 | // |
| 3 | // This file is part of LSystem3D. |
| 4 | // |
| 5 | // LSystem3D is free software; you can redistribute it and/or |
| 6 | // modify it under the terms of the GNU General Public License |
| 7 | // as published by the Free Software Foundation; either version 2 |
| 8 | // of the License, or (at your option) any later version. |
| 9 | // |
| 10 | // LSystem3D 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 General Public License for more details. |
| 14 | // |
| 15 | // You should have received a copy of the GNU General Public License |
| 16 | // along with LSystem3D; if not, write to the Free Software |
| 17 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | |
| 20 | |
| 21 | |
| 22 | #include <cstdlib> |
| 23 | |
| 24 | #include <sstream> |
| 25 | #include <string> |
| 26 | |
| 27 | #include "rule.h" |
| 28 | |
| 29 | using namespace std; |
| 30 | |
| 31 | |
| 32 | |
| 33 | /** |
| 34 | * Constructor |
| 35 | */ |
| 36 | Rule::Rule() |
| 37 | { |
| 38 | clear(); |
| 39 | } |
| 40 | |
| 41 | |
| 42 | |
| 43 | /** |
| 44 | * Constructor |
| 45 | * @param name name of rule |
| 46 | * @param content content of rule |
| 47 | * @param probability probability of rule |
| 48 | */ |
| 49 | Rule::Rule(string name, string content, double probability) |
| 50 | { |
| 51 | setName(name); |
| 52 | setContent(content); |
| 53 | setProbability(probability); |
| 54 | } |
| 55 | |
| 56 | |
| 57 | |
| 58 | /** |
| 59 | * Constructor |
| 60 | * @param ruleString the rule string |
| 61 | */ |
| 62 | Rule::Rule(string ruleString) |
| 63 | { |
| 64 | fromString(ruleString); |
| 65 | } |
| 66 | |
| 67 | |
| 68 | |
| 69 | /** |
| 70 | * Destructor |
| 71 | */ |
| 72 | Rule::~Rule() |
| 73 | { |
| 74 | } |
| 75 | |
| 76 | |
| 77 | |
| 78 | /** |
| 79 | * Clear rule |
| 80 | */ |
| 81 | void Rule::clear() |
| 82 | { |
| 83 | _name.clear(); |
| 84 | _content.clear(); |
| 85 | _probability = 0.0; |
| 86 | } |
| 87 | |
| 88 | |
| 89 | |
| 90 | /** |
| 91 | * Construct rule from string |
| 92 | * @param ruleString the rule string |
| 93 | */ |
| 94 | void Rule::fromString(string ruleString) |
| 95 | { |
| 96 | // name |
| 97 | setName(ruleString.substr(0, 1)); |
| 98 | |
| 99 | |
| 100 | // probability factor |
| 101 | |
| 102 | int i = 2; |
| 103 | |
| 104 | if (ruleString[1] == '=') |
| 105 | { |
| 106 | // use default probability |
| 107 | setProbability(1.0); |
| 108 | } |
| 109 | else if (ruleString[1] == '(') |
| 110 | { |
| 111 | // set probability |
| 112 | while (ruleString[i] != ')') |
| 113 | { |
| 114 | i++; |
| 115 | } |
| 116 | |
| 117 | setProbability(strtod(string(ruleString, 2, i - 2).c_str(), NULL)); |
| 118 | |
| 119 | // ignore the '=' |
| 120 | i += 2; |
| 121 | } |
| 122 | |
| 123 | // content |
| 124 | setContent(string(ruleString, i)); |
| 125 | } |
| 126 | |
| 127 | |
| 128 | |
| 129 | /** |
| 130 | * Construct rule string |
| 131 | * @return the rule string |
| 132 | */ |
| 133 | string Rule::toString() |
| 134 | { |
| 135 | // name |
| 136 | string rulesString = getName(); |
| 137 | |
| 138 | |
| 139 | // probability factor |
| 140 | |
| 141 | if (_probability > 0.0 && _probability < 1.0) |
| 142 | { |
| 143 | ostringstream probabilityString; |
| 144 | probabilityString << getProbability(); |
| 145 | |
| 146 | // TODO: precision |
| 147 | rulesString += '('; |
| 148 | rulesString += string(probabilityString.str(), 0, 4); |
| 149 | rulesString += ')'; |
| 150 | } |
| 151 | |
| 152 | |
| 153 | rulesString += '='; |
| 154 | |
| 155 | |
| 156 | // content |
| 157 | rulesString += getContent(); |
| 158 | |
| 159 | |
| 160 | return rulesString; |
| 161 | } |
| 162 | |
| 163 | |
| 164 | |
| 165 | /** |
| 166 | * Set rule name |
| 167 | * @param name the name |
| 168 | */ |
| 169 | void Rule::setName(string name) |
| 170 | { |
| 171 | _name = name; |
| 172 | } |
| 173 | |
| 174 | |
| 175 | |
| 176 | /** |
| 177 | * Set rule content |
| 178 | * @param content the content |
| 179 | */ |
| 180 | void Rule::setContent(string content) |
| 181 | { |
| 182 | string preprocessedRule; |
| 183 | |
| 184 | // preprocess the rule content |
| 185 | for (int i = 0; i < content.size(); i++) |
| 186 | { |
| 187 | // TODO: allow string as name |
| 188 | if (content[i] >= 'A' && content[i] <= 'Z' && content[i] != 'F') |
| 189 | { |
| 190 | // add rule operator |
| 191 | preprocessedRule += '@'; |
| 192 | } |
| 193 | preprocessedRule += content[i]; |
| 194 | } |
| 195 | |
| 196 | _content = preprocessedRule; |
| 197 | } |
| 198 | |
| 199 | |
| 200 | |
| 201 | /** |
| 202 | * Set rule probability |
| 203 | * @param probability the probability factor |
| 204 | */ |
| 205 | void Rule::setProbability(double probability) |
| 206 | { |
| 207 | if (probability >= 0 && probability <= 1) |
| 208 | { |
| 209 | _probability = probability; |
| 210 | } |
| 211 | else |
| 212 | { |
| 213 | probability = 0.0; |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | |
| 218 | |
| 219 | /** |
| 220 | * Get rule name |
| 221 | * @return the rule name |
| 222 | */ |
| 223 | string Rule::getName() |
| 224 | { |
| 225 | return _name; |
| 226 | } |
| 227 | |
| 228 | |
| 229 | |
| 230 | /** |
| 231 | * Get rule content |
| 232 | * @return the rule content |
| 233 | */ |
| 234 | string Rule::getContent() |
| 235 | { |
| 236 | string unpreprocessedRule; |
| 237 | |
| 238 | // unpreprocess the rule content |
| 239 | for (int i = 0; i < _content.size(); i++) |
| 240 | { |
| 241 | if (_content[i] != '@') |
| 242 | { |
| 243 | unpreprocessedRule += _content[i]; |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | return unpreprocessedRule; |
| 248 | } |
| 249 | |
| 250 | |
| 251 | |
| 252 | /** |
| 253 | * Get rule probability |
| 254 | * @return the probability |
| 255 | */ |
| 256 | double Rule::getProbability() |
| 257 | { |
| 258 | return _probability; |
| 259 | } |
| 260 | |
| 261 | |
| 262 | |
| 263 | /** |
| 264 | * Get preprocessed content |
| 265 | * @return the preprocessed content |
| 266 | */ |
| 267 | string Rule::getPreprocessedContent() |
| 268 | { |
| 269 | return _content; |
| 270 | } |