Mercurial > projects > mde
annotate mde/lookup/Options.d @ 84:e0f1ec7fe73a
Merge plus a few tweaks.
author | Diggory Hardy <diggory.hardy@gmail.com> |
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date | Sun, 31 Aug 2008 15:59:17 +0100 |
parents | ac1e3fd07275 |
children | 56c0ddd90193 |
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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 * Note: This module uses some non-spec functionality, which "works for me", but may need to be |
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23 * changed if it throws up problems. Specifically: templated virtual functions (Options.set, get |
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24 * and list), and accessing private templates from an unrelated class (Options.TName, TYPES). |
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25 * OptionChanges used to have a templated set member function (used by Options.set), which caused |
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26 * linker problems when the module wasn't compiled from scratch. |
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27 */ |
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28 module mde.lookup.Options; |
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29 |
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30 import mde.setup.paths; |
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31 import mde.exception; |
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32 |
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33 import mde.file.mergetag.Reader; |
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34 import mde.file.mergetag.Writer; |
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35 import mde.file.mergetag.DataSet; |
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36 import mde.file.serialize; |
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37 |
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38 import tango.core.Exception : ArrayBoundsException; |
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39 import tango.util.log.Log : Log, Logger; |
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40 |
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41 /** Base class for handling options. |
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42 * |
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43 * This class itself handles no options and should not be instantiated, but provides a sub-classable |
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44 * base for generic options handling. Also, the static portion of this class tracks sub-class |
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45 * instances and provides loading and saving methods. |
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46 * |
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47 * Each sub-class provides named variables for maximal-speed reading. Local sub-class references |
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48 * should be used for reading variables, and via the addOptionsClass() hook will be loaded from |
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49 * files during pre-init (init0 stage). Do not write changes directly to the subclasses or they will |
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50 * not be saved; instead use set(), for example, miscOpts.set!(char[])("L10n","en-GB"). Use an |
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51 * example like OptionsMisc as a template for creating a new Options sub-class. |
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52 * |
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53 * Details: Options sub-classes hold associative arrays of pointers to all option variables, with a |
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54 * char[] id. This list is used for saving, loading and to provide generic GUI options screens. The |
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55 * built-in support in Options is only for bool, int and char[] types (a float type may get added). |
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56 * Further to this, a generic class is used to store all options which have been changed, and if any |
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57 * have been changed, is merged with options from the user conf dir and saved on exit. |
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58 */ |
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59 /* An idea for potentially extending Options, but which doesn't seem necessary now: |
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60 Move static code from Options to an OptionSet class, which may be sub-classed. These sub-classes |
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61 may be hooked in to the master OptionSet class to shadow all Options classes and be notified of |
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62 changes, and may or may not have values loaded from files during init. Change-sets could be |
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63 rewritten to use this. |
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64 However, only the changesets should need to be notified of each change (gui interfaces could simply |
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65 be notified that a change occured and redraw everything; users of options can just re-take their |
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66 values every time they use them). */ |
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67 class Options : IDataSection |
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68 { |
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69 protected this() {} /// Do not instantiate directly. |
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70 |
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71 // All supported types, for generic handling via templates. It should be possible to change |
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72 // the supported types simply by changing this list now (untested). |
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73 template store(A...) { alias A store; } |
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74 alias store!(bool, int, double, char[]) TYPES; |
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75 //BEGIN Templates: internal |
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76 private { |
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77 // Get name of a type. Basically just stringof, but special handling for arrays. |
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78 // Use TName!(T) for a valid symbol name, and T.stringof for a type. |
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79 template TName(T : T[]) { |
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80 const char[] TName = TName!(T) ~ "A"; |
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81 } |
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82 template TName(T) { |
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83 const char[] TName = T.stringof; |
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84 } |
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85 |
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86 // Pointer lists |
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87 template PLists(T, A...) { |
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88 static if (A.length) { |
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89 const char[] PLists = T.stringof~"*[ID] opts"~TName!(T)~";\n" ~ PLists!(A); |
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90 } else |
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91 const char[] PLists = T.stringof~"*[ID] opts"~TName!(T)~";\n"; |
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92 } |
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93 |
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94 // True if type is one of A |
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95 template TIsIn(T, A...) { |
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96 static if (A.length) { |
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97 static if (is(T == A[0])) |
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98 const bool TIsIn = true; |
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99 else |
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100 const bool TIsIn = TIsIn!(T,A[1..$]); |
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101 } else |
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102 const bool TIsIn = false; // no more possibilities |
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103 } |
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104 |
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105 // For addTag |
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106 template addTagMixin(T, A...) { |
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107 const char[] ifBlock = `if (tp == "`~T.stringof~`") { |
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108 `~T.stringof~`** p = id in opts`~TName!(T)~`; |
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109 if (p !is null) **p = parseTo!(`~T.stringof~`) (dt); |
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110 }`; |
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111 static if (A.length) |
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112 const char[] addTagMixin = ifBlock~` else `~addTagMixin!(A).addTagMixin; |
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113 else |
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114 const char[] addTagMixin = ifBlock; |
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115 } |
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116 |
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117 // For writeAll |
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118 template writeAllMixin(A...) { |
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119 static if (A.length) { |
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120 const char[] writeAllMixin = |
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121 `foreach (ID id, `~A[0].stringof~`* val; opts`~TName!(A[0])~`) dlg ("`~A[0].stringof~`", id, parseFrom!(`~A[0].stringof~`) (*val));` ~ writeAllMixin!(A[1..$]); |
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122 } else |
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123 const char[] writeAllMixin = ``; |
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124 } |
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125 } |
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126 //END Templates: internal |
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127 |
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128 |
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129 //BEGIN Static |
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130 static { |
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131 /** Add an options sub-class to the list for loading and saving. |
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132 * |
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133 * Call from static this() (before Init calls load()). */ |
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134 void addOptionsClass (Options c, char[] i) |
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135 in { // Trap a couple of potential coding errors: |
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136 assert (c !is null); // Instance must be created before calling addOptionsClass |
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137 assert (((cast(ID) i) in subClasses) is null); // Don't allow a silent replacement |
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138 } body { |
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139 subClasses[cast(ID) i] = c; |
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140 } |
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141 |
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142 // Track all sections for saving/loading/other generic handling. |
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143 Options[ID] subClasses; |
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144 bool changed = false; // any changes at all, i.e. do we need to save? |
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145 |
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146 /* Load/save options from file. |
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147 * |
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148 * If the file doesn't exist, no reading is attempted (options are left at default values). |
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149 */ |
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150 private const fileName = "options"; |
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151 void load () { |
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152 try { |
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153 IReader reader; |
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154 reader = confDir.makeMTReader (fileName, PRIORITY.LOW_HIGH); |
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155 reader.dataSecCreator = delegate IDataSection(ID id) { |
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156 /* Recognise each defined section, and return null for unrecognised sections. */ |
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157 Options* p = id in subClasses; |
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158 if (p !is null) return *p; |
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159 else return null; |
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160 }; |
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161 reader.read; |
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162 } catch (NoFileException e) { |
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163 // Just return. Options file will be created on exit. |
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164 } catch (Exception e) { |
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165 logger.warn ("Loading options failed: "~e.msg); |
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166 logger.warn ("If warning persists, delete the offending file."); // FIXME - delete the bad file somehow |
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167 } |
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168 } |
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169 void save () { |
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170 if (!changed) return; // no changes to save |
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171 |
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172 DataSet ds = new DataSet(); |
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173 foreach (id, subOpts; subClasses) ds.sec[id] = subOpts.optionChanges; |
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174 |
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175 // Read locally-stored options |
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176 try { |
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177 IReader reader; |
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178 reader = confDir.makeMTReader (fileName, PRIORITY.HIGH_ONLY, ds); |
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179 reader.dataSecCreator = delegate IDataSection(ID id) { |
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180 return null; // All recognised sections are already in the dataset. |
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181 }; |
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182 reader.read; |
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183 } catch (NoFileException) { |
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184 // No user file exists; not an error. |
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185 } catch (Exception e) { |
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186 // Log a message and continue, overwriting the file: |
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187 logger.error ("Loading options aborted: " ~ e.msg); |
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188 } |
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189 |
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190 try { |
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191 IWriter writer; |
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192 writer = confDir.makeMTWriter (fileName, ds); |
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193 writer.write(); |
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194 } catch (Exception e) { |
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195 logger.error ("Saving options aborted: "~e.msg); |
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196 } |
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197 } |
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198 |
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199 private Logger logger; |
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200 static this() { |
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201 logger = Log.getLogger ("mde.lookup.Options"); |
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202 } |
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203 } |
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204 //END Static |
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205 |
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206 |
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207 //BEGIN Non-static |
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208 /+ NOTE: according to spec: "Templates cannot be used to add non-static members or virtual |
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209 functions to classes." However, this appears to work (but linking problems did occur). |
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210 Alternative: use mixins. From OptionsChanges: |
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211 // setT (used to be a template, but: |
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212 // Templates cannot be used to add non-static members or virtual functions to classes. ) |
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213 template setMixin(A...) { |
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214 static if (A.length) { |
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215 const char[] setMixin = `void set`~TName!(A[0])~` (ID id, `~A[0].stringof~` x) { |
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216 `~TName!(T)~`s[id] = x; |
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217 } |
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218 ` ~ setMixin!(A[1..$]); |
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219 } else |
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220 const char[] setMixin = ``; |
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221 }+/ |
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222 /** Set option symbol of an Options sub-class to val. |
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223 * |
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224 * Due to the way options are handled generically, string IDs must be used to access the options |
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225 * via hash-maps, which is a little slower than direct access but necessary since the option |
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226 * must be changed in two separate places. */ |
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227 void set(T) (char[] symbol, T val) { |
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228 static assert (TIsIn!(T,TYPES), "Options does not support type "~T.stringof); |
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229 |
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230 changed = true; // something got set (don't bother checking this isn't what it already was) |
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231 |
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232 try { |
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233 mixin (`*(opts`~TName!(T)~`[cast(ID) symbol]) = val;`); |
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234 mixin (`optionChanges.`~TName!(T)~`s[symbol] = val;`); |
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235 } catch (ArrayBoundsException) { |
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236 // log and ignore: |
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237 logger.error ("Options.set: invalid symbol"); |
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238 } |
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239 } |
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240 |
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241 /** Get option symbol of an Options sub-class. |
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242 * |
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243 * Using this method to read an option is not necessary, but allows for generic use. */ |
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244 T get(T) (char[] symbol) { |
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245 static assert (TIsIn!(T,TYPES), "Options does not support type "~T.stringof); |
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246 |
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247 mixin (`alias opts`~TName!(T)~` optsVars;`); |
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248 |
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249 try { |
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250 return *(optsVars[cast(ID) symbol]); |
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251 } catch (ArrayBoundsException) { |
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252 // log and ignore: |
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253 logger.error ("Options.get: invalid symbol"); |
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254 } |
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255 } |
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256 |
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257 /** List the names of all options of a specific type. */ |
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258 char[][] list(T) () { |
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259 static assert (TIsIn!(T,TYPES), "Options does not support type "~T.stringof); |
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260 |
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261 mixin (`alias opts`~TName!(T)~` optsVars;`); |
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262 |
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263 return optsVars.keys; |
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264 } |
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265 |
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266 protected { |
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267 OptionChanges optionChanges; // all changes to options (for saving) |
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268 |
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269 // The "pointer lists", e.g. char[]*[ID] optscharA; |
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270 mixin (PLists!(TYPES)); |
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271 } |
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272 |
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273 //BEGIN Mergetag loading/saving code |
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274 void addTag (char[] tp, ID id, char[] dt) { |
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275 mixin(addTagMixin!(TYPES).addTagMixin); |
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276 } |
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277 |
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278 void writeAll (ItemDelg dlg) { |
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279 mixin(writeAllMixin!(TYPES)); |
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280 } |
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281 //END Mergetag loading/saving code |
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282 //END Non-static |
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283 |
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284 |
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285 //BEGIN Templates: impl & optionsThis |
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286 private { |
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287 // Return index of first comma, or halts if not found. |
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288 template cIndex(char[] A) { |
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289 static if (A.length == 0) |
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290 static assert (false, "Error in implementation"); |
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291 else static if (A[0] == ',') |
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292 const size_t cIndex = 0; |
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293 else |
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294 const size_t cIndex = 1 + cIndex!(A[1..$]); |
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295 } |
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296 // Return index of first semi-colon, or halts if not found. |
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297 template scIndex(char[] A) { |
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298 static if (A.length == 0) |
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299 static assert (false, "Error: no trailing semi-colon"); |
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300 else static if (A[0] == ';') |
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301 const size_t scIndex = 0; |
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302 else |
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303 const size_t scIndex = 1 + scIndex!(A[1..$]); |
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304 } |
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305 // Look for "type symbols;" in A and return symbols as a comma separated list of names |
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306 // (even if type is encountered more than once). Output may contain spaces and, if |
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307 // non-empty, will contain a trailing comma. Assumes scIndex always returns less than A.$. |
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308 template parseT(char[] type, char[] A) { |
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309 static if (A.length < type.length + 1) // end of input, no match |
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310 const char[] parseT = ""; |
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311 else static if (A[0] == ' ') // leading whitespace: skip |
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312 const char[] parseT = parseT!(type, A[1..$]); |
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313 else static if (A[0..type.length] == type && A[type.length] == ' ') // match |
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314 const char[] parseT = A[type.length+1 .. scIndex!(A)] ~ "," ~ |
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315 parseT!(type, A[scIndex!(A)+1 .. $]); |
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316 else // no match |
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317 const char[] parseT = parseT!(type, A[scIndex!(A)+1 .. $]); |
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318 } |
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319 // May have a trailing comma. Assumes cIndex always returns less than A.$. |
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320 template aaVars(char[] A) { |
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321 static if (A.length == 0) |
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322 const char[] aaVars = ""; |
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323 else static if (A[0] == ' ') |
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324 const char[] aaVars = aaVars!(A[1..$]); |
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325 else |
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326 const char[] aaVars = "\""~A[0..cIndex!(A)]~"\"[]:&"~A[0..cIndex!(A)] ~ "," ~ |
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327 aaVars!(A[cIndex!(A)+1..$]); |
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328 } |
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329 // strip Trailing Comma |
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330 template sTC(char[] A) { |
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331 static if (A.length && A[$-1] == ',') |
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332 const char[] sTC = A[0..$-1]; |
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333 else |
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334 const char[] sTC = A; |
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335 } |
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336 // if string is empty (other than space) return null, otherwise enclose: [A] |
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337 template listOrNull(char[] A) { |
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338 static if (A.length == 0) |
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339 const char[] listOrNull = "null"; |
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340 else static if (A[0] == ' ') |
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341 const char[] listOrNull = listOrNull!(A[1..$]); |
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342 else |
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343 const char[] listOrNull = "["~A~"]"; |
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344 } |
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345 // for recursing on TYPES |
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346 template optionsThisInternal(char[] A, B...) { |
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347 static if (B.length) { |
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348 const char[] optionsThisInternal = `opts`~TName!(B[0])~` = `~listOrNull!(sTC!(aaVars!(parseT!(B[0].stringof,A))))~";\n" ~ optionsThisInternal!(A,B[1..$]); |
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349 } else |
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350 const char[] optionsThisInternal = ``; |
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351 } |
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352 } protected { |
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353 /** Produces the implementation code to go in the constuctor. */ |
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354 template optionsThis(char[] A) { |
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355 const char[] optionsThis = |
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356 "optionChanges = new OptionChanges;\n" ~ |
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357 optionsThisInternal!(A,TYPES); |
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358 } |
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359 /+ Needs too many custom parameters to be worth it? Plus makes class less readable. |
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360 /** Produces the implementation code to go in the static constuctor. */ |
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361 template optClassAdd(char[] symb) { |
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362 const char[] optClassAdd = symb ~ "=new "~classinfo(this).name~";\n";//Options.addOptionsClass("~symb~", );\n"; |
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363 }+/ |
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364 /** mixin impl("type symbol[, symbol[...]];[type symbol[...];][...]") |
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365 * |
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366 * Where type is one of bool, int, double, char[]. E.g. |
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367 * --- |
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368 * mixin (impl ("bool a, b; int i;")); |
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369 * --- |
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370 * |
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371 * In case this() needs to be customized, mixin(impl!(A)) is equivalent to: |
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372 * --- |
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373 * mixin (A~` |
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374 this () { |
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375 `~optionsThis!(A)~` |
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376 }`); |
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377 * --- |
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378 * |
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379 * Notes: Only use space as whitespace (no new-lines or tabs). Make sure to add a trailing |
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380 * semi-colon (;) or you'll get told off! :D |
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381 * In general errors aren't reported well. Trial with pragma (msg, impl!(...)); if |
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382 * necessary. |
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383 * |
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384 * Extending: mixins could also be used for the static this() {...} or even the whole |
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385 * class, but doing so would rather decrease readability of any implementation. */ |
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386 template impl(char[] A /+, char[] symb+/) { |
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387 const char[] impl = A~"\nthis(){\n"~optionsThis!(A)~"}"; |
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388 // ~"\nstatic this(){\n"~optClassAdd!(symb)~"}" |
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389 } |
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390 } |
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391 //END Templates: impl & optionsThis |
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392 } |
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393 |
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394 /** Special class to store all locally changed options, whatever the section. */ |
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395 class OptionChanges : IDataSection |
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396 { |
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397 //BEGIN Templates |
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398 private { |
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399 alias Options.TName TName; |
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400 alias Options.TYPES TYPES; |
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401 template Vars(A...) { |
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402 static if (A.length) { |
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403 const char[] Vars = A[0].stringof~`[ID] `~TName!(A[0])~`s;` ~ Vars!(A[1..$]); |
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404 } else |
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405 const char[] Vars = ``; |
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406 } |
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407 |
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408 // For addTag |
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409 template addTagMixin(T, A...) { |
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410 const char[] ifBlock = `if (tp == "`~T.stringof~`") { |
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411 if ((id in `~TName!(T)~`s) is null) |
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412 `~TName!(T)~`s[id] = parseTo!(`~T.stringof~`) (dt); |
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413 }`; |
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414 static if (A.length) |
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415 const char[] addTagMixin = ifBlock~` else `~addTagMixin!(A).addTagMixin; |
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416 else |
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417 const char[] addTagMixin = ifBlock; |
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418 } |
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419 // For writeAll |
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420 template writeAllMixin(A...) { |
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421 static if (A.length) { |
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422 const char[] writeAllMixin = |
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423 `foreach (id, val; `~TName!(A[0])~`s) |
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424 dlg ("`~A[0].stringof~`", id, serialize (val)); |
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425 ` ~ writeAllMixin!(A[1..$]); |
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426 } else |
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427 const char[] writeAllMixin = ``; |
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428 } |
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429 } |
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430 //END Templates |
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431 // These store the actual values, but are never accessed directly except when initially added. |
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432 // optsX store pointers to each item added along with the ID and are used for access. |
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433 mixin(Vars!(TYPES)); |
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434 |
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435 this () {} |
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436 |
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437 //BEGIN Mergetag loading/saving code |
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438 // HIGH_LOW priority: only load symbols not currently existing |
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439 void addTag (char[] tp, ID id, char[] dt) { |
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440 mixin (addTagMixin!(TYPES).addTagMixin); |
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441 } |
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442 void writeAll (ItemDelg dlg) { |
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443 mixin(writeAllMixin!(TYPES)); |
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444 } |
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445 //END Mergetag loading/saving code |
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446 } |
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447 |
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448 /* NOTE: Options sub-classes are expected to use a template to ease inserting contents and |
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449 * hide some of the "backend" functionality. Use impl as below, or read the documentation for impl. |
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450 * |
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451 * Each entry should have a Translation entry with humanized names and descriptions in |
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452 * data/L10n/ClassName.mtt |
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453 * |
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454 * To create a new Options sub-class, just copy, paste and adjust. |
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455 */ |
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456 |
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457 /** A home for all miscellaneous options, at least for now. */ |
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458 OptionsMisc miscOpts; |
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459 class OptionsMisc : Options { |
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460 mixin (impl!("bool useThreads, exitImmediately; int logOptions; double pollInterval; char[] L10n, a,b,c;")); |
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461 |
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462 static this() { |
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463 miscOpts = new OptionsMisc; |
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464 Options.addOptionsClass (miscOpts, "misc"); |
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465 } |
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466 } |