Mercurial > projects > mde
annotate mde/Options.d @ 32:316b0230a849
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committer: Diggory Hardy <diggory.hardy@gmail.com>
author | Diggory Hardy <diggory.hardy@gmail.com> |
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date | Wed, 30 Apr 2008 18:05:56 +0100 |
parents | |
children | 57d000574d75 |
rev | line source |
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32
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1 /* LICENSE BLOCK |
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2 Part of mde: a Modular D game-oriented Engine |
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3 Copyright © 2007-2008 Diggory Hardy |
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4 |
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5 This program is free software: you can redistribute it and/or modify it under the terms |
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6 of the GNU General Public License as published by the Free Software Foundation, either |
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7 version 2 of the License, or (at your option) any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; |
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10 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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11 See the GNU General Public License for more details. |
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12 |
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13 You should have received a copy of the GNU General Public License |
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14 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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15 |
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16 /** This module handles stored options, currently all except input maps. |
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17 * |
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18 * The purpose of having all options centrally controlled is to allow generic handling by the GUI |
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19 * and ease saving and loading of values. The Options class is only really designed around handling |
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20 * small numbers of variables for now. |
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21 */ |
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22 module mde.Options; |
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23 |
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24 import mde.exception; |
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25 |
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26 import mde.mergetag.Reader; |
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27 import mde.mergetag.Writer; |
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28 import mde.mergetag.DataSet; |
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29 import mde.mergetag.exception; |
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30 import mde.resource.paths; |
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31 |
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32 import tango.scrapple.text.convert.parseTo : parseTo; |
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33 import tango.scrapple.text.convert.parseFrom : parseFrom; |
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34 |
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35 import tango.core.Exception : ArrayBoundsException; |
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36 import tango.util.log.Log : Log, Logger; |
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37 |
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38 /** Base class for handling options. |
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39 * |
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40 * This class itself handles no options and should not be instantiated, but provides a sub-classable |
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41 * base for generic options handling. Also, the static portion of this class tracks sub-class |
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42 * instances and provides loading and saving methods. |
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43 * |
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44 * Each sub-class provides named variables for maximal-speed reading. Local sub-class references |
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45 * should be used for reading variables, and via the addOptionsClass() hook will be loaded from |
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46 * files during pre-init (init0 stage). Do not write changes directly to the subclasses or they will |
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47 * not be saved; use, for example, Options.setBool(...). |
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48 * |
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49 * Details: Options sub-classes hold associative arrays of pointers to all option variables, with a |
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50 * char[] id. This list is used for saving, loading and to provide generic GUI options screens. The |
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51 * built-in support in Options is only for bool, int and char[] types (a float type may get added). |
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52 * Further to this, a generic class is used to store all options which have been changed, and if any |
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53 * have been changed, is merged with options from the user conf dir and saved on exit. |
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54 */ |
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55 class Options : IDataSection |
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56 { |
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57 // No actual options are stored by this class. However, much of the infrastructure is |
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58 // present since it need not be redefined in sub-classes. |
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59 |
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60 // The "pointer lists": |
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61 protected bool* [ID] optsBool; |
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62 protected char[]*[ID] optsCharA; |
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63 protected int* [ID] optsInt; |
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64 |
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65 //BEGIN Mergetag loading/saving code |
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66 void addTag (char[] tp, ID id, char[] dt) { |
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67 if (tp == "bool") { |
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68 bool** p = id in optsBool; |
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69 if (p !is null) **p = parseTo!(bool) (dt); |
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70 } else if (tp == "char[]") { |
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71 char[]** p = id in optsCharA; |
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72 if (p !is null) **p = parseTo!(char[]) (dt); |
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73 } else if (tp == "int") { |
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74 int** p = id in optsInt; |
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75 if (p !is null) **p = parseTo!(int) (dt); |
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76 } |
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77 } |
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78 void writeAll (ItemDelg dlg) { |
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79 foreach (ID id, bool* val; optsBool) dlg ("bool" , id, parseFrom!(bool ) (*val)); |
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80 foreach (ID id, char[]* val; optsCharA) dlg ("char[]", id, parseFrom!(char[]) (*val)); |
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81 foreach (ID id, int* val; optsInt) dlg ("int" , id, parseFrom!(int ) (*val)); |
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82 } |
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83 //END Mergetag loading/saving code |
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84 |
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85 //BEGIN Static |
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86 /** Add an options sub-class to the list for loading and saving. |
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87 * |
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88 * Call from static this() (before Init calls load()). */ |
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89 static void addOptionsClass (Options c, char[] i) |
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90 in { // Trap a couple of potential coding errors: |
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91 assert (c !is null); // Instance must be created before calling addOptionsClass |
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92 assert (((cast(ID) i) in subClasses) is null); // Don't allow a silent replacement |
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93 } body { |
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94 subClasses[cast(ID) i] = c; |
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95 subClassChanges[cast(ID) i] = new OptionsGeneric; |
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96 } |
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97 |
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98 /** Set option symbol of Options class subClass to val. |
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99 * |
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100 * Due to the way options are handled generically, string IDs must be used to access the options |
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101 * via hash-maps, which is a little slower than direct access but necessary since the option |
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102 * must be changed in two separate places. */ |
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103 private static const ERR_MSG = "Options.setXXX called with incorrect parameters!"; |
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104 static void setBool (char[] subClass, char[] symbol, bool val) { |
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105 changed = true; // something got set (don't bother checking this isn't what it already was) |
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106 |
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107 try { |
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108 *(subClasses[cast(ID) subClass].optsBool[cast(ID) symbol]) = val; |
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109 subClassChanges[cast(ID) subClass].setBool (cast(ID) symbol, val); |
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110 } catch (ArrayBoundsException) { |
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111 // log and ignore: |
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112 logger.error (ERR_MSG); |
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113 } |
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114 } |
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115 static void setInt (char[] subClass, char[] symbol, int val) { |
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116 changed = true; // something got set (don't bother checking this isn't what it already was) |
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117 |
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118 try { |
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119 *(subClasses[cast(ID) subClass].optsInt[cast(ID) symbol]) = val; |
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120 subClassChanges[cast(ID) subClass].setInt (cast(ID) symbol, val); |
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121 } catch (ArrayBoundsException) { |
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122 // log and ignore: |
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123 logger.error (ERR_MSG); |
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124 } |
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125 } |
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126 static void setCharA (char[] subClass, char[] symbol, char[] val) { |
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127 changed = true; // something got set (don't bother checking this isn't what it already was) |
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128 |
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129 try { |
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130 *(subClasses[cast(ID) subClass].optsCharA[cast(ID) symbol]) = val; |
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131 subClassChanges[cast(ID) subClass].setCharA (cast(ID) symbol, val); |
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132 } catch (ArrayBoundsException) { |
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133 // log and ignore: |
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134 logger.error (ERR_MSG); |
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135 } |
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136 } |
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137 |
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138 // Track all sections for saving/loading/other generic handling. |
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139 static Options[ID] subClasses; |
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140 static OptionsGeneric[ID] subClassChanges; |
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141 static bool changed = false; // any changes at all, i.e. do we need to save? |
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142 |
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143 /* Load/save options from file. |
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144 * |
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145 * If the file doesn't exist, no reading is attempted (options are left at default values). |
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146 */ |
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147 private static const fileName = "options"; |
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148 private static const MT_LOAD_EXC = "Loading options aborted:"; |
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149 static void load () { |
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150 // Check it exists (if not it should still be created on exit). |
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151 // Don't bother checking it's not a folder, because it could still be a block or something. |
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152 if (!confDir.exists (fileName)) return; |
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153 |
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154 try { |
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155 IReader reader; |
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156 reader = confDir.makeMTReader (fileName, PRIORITY.LOW_HIGH); |
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157 reader.dataSecCreator = delegate IDataSection(ID id) { |
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158 /* Recognise each defined section, and return null for unrecognised sections. */ |
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159 Options* p = id in subClasses; |
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160 if (p !is null) return *p; |
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161 else return null; |
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162 }; |
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163 reader.read; |
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164 } catch (MTException e) { |
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165 logger.fatal (MT_LOAD_EXC); |
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166 logger.fatal (e.msg); |
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167 throw new optionsLoadException ("Mergetag exception (see above message)"); |
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168 } |
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169 } |
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170 static void save () { |
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171 if (!changed) return; // no changes to save |
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172 |
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173 DataSet ds = new DataSet(); |
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174 foreach (id, sec; subClassChanges) ds.sec[id] = sec; |
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175 |
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176 // Read locally-stored options |
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177 try { |
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178 IReader reader; |
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179 reader = confDir.makeMTReader (fileName, PRIORITY.HIGH_ONLY, ds); |
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180 reader.dataSecCreator = delegate IDataSection(ID id) { |
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181 return null; // All recognised sections are already in the dataset. |
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182 }; |
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183 reader.read; |
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184 } catch (MTFileIOException) { |
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185 // File either didn't exist or couldn't be opened. |
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186 // Presuming the former, this is not a problem. |
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187 } catch (MTException e) { |
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188 // Log a message and continue, overwriting the file: |
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189 logger.error (MT_LOAD_EXC); |
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190 logger.error (e.msg); |
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191 } |
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192 |
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193 try { |
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194 IWriter writer; |
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195 writer = confDir.makeMTWriter (fileName, ds); |
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196 writer.write(); |
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197 } catch (MTException e) { |
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198 logger.error ("Saving options aborted! Reason:"); |
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199 logger.error (e.msg); |
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200 } |
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201 } |
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202 |
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203 private static Logger logger; |
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204 static this() { |
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205 logger = Log.getLogger ("mde.options"); |
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206 } |
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207 //END Static |
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208 |
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209 //BEGIN Templates |
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210 template store(A...) { |
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211 alias A a; |
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212 } |
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213 template decRecurse(char[] A, B...) { |
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214 static if (B.length) const char[] decRecurse = A ~ ", " ~ decRecurse!(B); |
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215 else const char[] decRecurse = A; |
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216 } |
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217 template decBool(A...) { |
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218 const char[] decBool = "bool " ~ decRecurse!(A) ~ ";\n"; |
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219 } |
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220 template decCharA(A...) { |
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221 const char[] decCharA = "char[] " ~ decRecurse!(A) ~ ";\n"; |
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222 } |
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223 template decInt(A...) { |
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224 const char[] decInt = "int " ~ decRecurse!(A) ~ ";\n"; |
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225 } |
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226 template aaRecurse(char[] A, B...) { |
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227 static if (B.length) const char[] aaRecurse = "\""~A~"\"[]:&"~A ~ ", " ~ aaRecurse!(B); |
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228 else const char[] aaRecurse = "\""~A~"\"[]:&"~A; |
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229 } |
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230 template aaBool(A...) { |
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231 const char[] aaBool = "optsBool = [" ~ aaRecurse!(A) ~ "];\n"; |
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232 } |
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233 template aaInt(A...) { |
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234 const char[] aaInt = "optsInt = [" ~ aaRecurse!(A) ~ "];\n"; |
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235 } |
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236 template aaCharA(A...) { |
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237 const char[] aaCharA = "optsCharA = [" ~ aaRecurse!(A) ~ "];\n"; |
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238 } |
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239 //END Templates |
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240 } |
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241 |
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242 /* Special class to store all locally changed options, whatever the section. */ |
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243 class OptionsGeneric : Options { |
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244 // These store the actual values, but are never accessed directly except when initially added. |
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245 // optsX store pointers to each item added along with the ID and are used for access. |
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246 bool[] bools; |
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247 int[] ints; |
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248 char[][] strings; |
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249 |
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250 this () {} |
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251 |
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252 void setBool (ID id, bool x) { |
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253 bool** p = id in optsBool; |
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254 if (p !is null) **p = x; |
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255 else { |
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256 bools ~= x; |
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257 optsBool[id] = &bools[$-1]; |
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258 } |
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259 } |
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260 void setInt (ID id, int x) { |
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261 int** p = id in optsInt; |
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262 if (p !is null) **p = x; |
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263 else { |
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264 ints ~= x; |
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265 optsInt[id] = &ints[$-1]; |
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266 } |
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267 } |
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268 void setCharA (ID id, char[] x) { |
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269 char[]** p = id in optsCharA; |
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270 if (p !is null) **p = x; |
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271 else { |
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272 strings ~= x; |
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273 optsCharA[id] = &strings[$-1]; |
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274 } |
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275 } |
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276 |
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277 //BEGIN Mergetag loading/saving code |
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278 // Reverse priority: only load symbols not currently existing |
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279 void addTag (char[] tp, ID id, char[] dt) { |
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280 if (tp == "bool") { |
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281 if ((id in optsBool) is null) { |
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282 bools ~= parseTo!(bool) (dt); |
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283 optsBool[id] = &bools[$-1]; |
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284 } |
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285 } else if (tp == "char[]") { |
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286 if ((id in optsCharA) is null) { |
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287 strings ~= parseTo!(char[]) (dt); |
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288 optsCharA[id] = &strings[$-1]; |
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289 } |
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290 char[]** p = id in optsCharA; |
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291 if (p !is null) **p = parseTo!(char[]) (dt); |
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292 } else if (tp == "int") { |
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293 if ((id in optsInt) is null) { |
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294 ints ~= parseTo!(int) (dt); |
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295 optsInt[id] = &ints[$-1]; |
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296 } |
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297 } |
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298 } |
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299 //END Mergetag loading/saving code |
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300 } |
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301 |
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302 /* NOTE: These Options classes use templates to ease inserting contents. |
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303 * |
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304 * Each entry has an I18nTranslation entry; see data/L10n/ClassName.mtt for descriptions. |
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305 * |
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306 * To create a new class, just copy and paste anywhere and adjust. |
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307 */ |
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308 |
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309 /** A home for all miscellaneous options, at least for now. */ |
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310 OptionsMisc miscOpts; |
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311 class OptionsMisc : Options { |
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312 alias store!("useThreads") BOOL; |
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313 alias store!("logLevel") INT; |
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314 alias store!("L10n") CHARA; |
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315 |
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316 mixin (decBool!(BOOL.a)); |
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317 mixin (decInt!(INT.a)); |
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318 mixin (decCharA!(CHARA.a)); |
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319 |
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320 this () { |
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321 mixin (aaBool!(BOOL.a)); |
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322 mixin (aaInt!(INT.a)); |
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323 mixin (aaCharA!(CHARA.a)); |
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324 } |
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325 |
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326 static this() { |
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327 miscOpts = new OptionsMisc; |
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328 Options.addOptionsClass (miscOpts, "misc"); |
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329 } |
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330 } |