Mercurial > projects > mde
annotate mde/lookup/Translation.d @ 79:61ea26abe4dd
Moved mde/mergetag/parse/parse(To/From) to mde/mergetag/(de)serialize. Implemented (de)serialization of structs.
author | Diggory Hardy <diggory.hardy@gmail.com> |
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date | Tue, 05 Aug 2008 11:51:51 +0100 |
parents | 25cb7420dc91 |
children | d8fccaa45d5f |
rev | line source |
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Applied the GNU GPL v2 to mde.
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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. |
17
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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 /** Translation − internationalization module for translating strings |
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16 * |
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17 * The idea behind this module is a class which, when asked to load symbols for a particular module/ |
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18 * package/part of the program, will load internationalized names and optional descriptions for each |
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19 * symbol needing translation. No support for non-left-to-right scripts is currently planned, and |
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20 * this module is currently limited to translations, although support for different date formats, |
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21 * etc. could potentially be added later. |
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22 * |
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23 * Code symbols are used as identifiers for each name and its optional description. The code symbol |
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24 * will be used as a fallback in the case no entry exists, however it is not intended to provide the |
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25 * string for the default language (a "translation" should be used for the default language). |
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26 * |
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27 * Each locale may specify dependant locales/sections which will be loaded and merged in to the |
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28 * database, to cover for symbols with a missing entry. Sections are loaded in the order specified, |
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29 * with each section's sub-dependancies loaded before continuing with the next top-level dependancy. |
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30 * A list of loaded sections is used to prevent any locale/section from being loaded twice, and thus |
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31 * allow circular dependancies. |
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32 * |
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33 * In order that translated strings get updated correctly to reflect changes, each entry carries a |
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34 * version number. If, for any entry, a translation exists with a higher version number, that entry |
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35 * is out of date. A tool should be made for checking for out of date entries to take advantage of |
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36 * this feature. Of course, out of date entries are still valid for use. |
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37 */ |
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38 module mde.lookup.Translation; |
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39 |
74 | 40 import mde.lookup.Options; |
41 import mde.setup.paths; | |
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42 import mde.exception; |
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43 |
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44 import mde.mergetag.DataSet; |
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45 import mde.mergetag.Reader; |
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46 import mde.mergetag.exception; |
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47 import mde.mergetag.deserialize; |
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48 |
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49 import tango.util.log.Log : Log, Logger; |
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50 |
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51 /** The translation class |
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52 * |
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53 * See module description for details. |
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54 * |
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55 * Encoding used is UTF-8. |
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56 */ |
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57 class Translation : IDataSection |
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58 { |
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59 final char[] name; /// The module/package/... which the instance is for |
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60 final char[] L10n; /// The localization loaded (e.g. en-GB) |
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61 |
74 | 62 alias entry opCall; /// Convenience alias |
63 | |
64 /** Get the translation for the given identifier. | |
65 * If no entry exists, the identifier will be returned. | |
66 * | |
67 * Optionally, the description can be returned. */ | |
68 char[] entry (char[] id) { | |
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69 Entry* p = id in entries; |
74 | 70 if (p) { |
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71 return p.name; |
74 | 72 } else { |
73 return id; | |
74 } | |
75 } | |
76 /** ditto */ | |
77 char[] entry (char[] id, out char[] description) { | |
78 Entry* p = id in entries; | |
79 if (p) { | |
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80 description = p.desc; |
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81 return p.name; |
74 | 82 } else { |
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83 return id; |
74 | 84 } |
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85 } |
74 | 86 |
87 /** Alternative usage: return a Translation.Entry struct. */ | |
88 Entry getStruct (char[] id) { | |
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89 Entry* p = id in entries; |
74 | 90 if (p) { |
91 return *p; | |
92 } else { | |
93 Entry ret; | |
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94 ret.name = id; |
74 | 95 return ret; |
96 } | |
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97 } |
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98 |
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99 /** Load the translation for the requested module/package/... |
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100 * |
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101 * Options (mde.options) must have been loaded before this is run. |
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102 * |
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103 * Params: |
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104 * name The module/package/... to load strings for. |
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105 * |
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106 * Throws: |
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107 * If no localization exists for this name and the current locale (or any locale to be chain- |
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108 * loaded), or an error occurs while loading the database, a L10nLoadException will be thrown. |
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109 */ |
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110 static Translation load (char[] name) |
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111 { |
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112 bool[ID] loadedSecs; // set of all locales/sections loaded; used to prevent circular loading |
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113 ID[] secsToLoad // locales/sections to load (dependancies may be added) |
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114 = [cast(ID) miscOpts.L10n]; // start by loading the current locale |
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115 |
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116 Translation transl = new Translation (name, miscOpts.L10n); |
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117 |
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118 IReader reader; |
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119 try { |
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120 reader = dataDir.makeMTReader (name, PRIORITY.HIGH_LOW); |
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121 /* Note: we don't want to load every translation section depended on to its own class |
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122 * instance, since we want to merge them. So make every mergetag section use the same |
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123 * instance. */ |
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124 reader.dataSecCreator = delegate IDataSection(ID) { |
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125 return transl; |
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126 }; |
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127 |
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128 while (secsToLoad.length) { // while we have sections left to load |
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129 ID sec = secsToLoad[0]; // take current section |
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130 secsToLoad = secsToLoad[1..$]; // and remove from list |
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131 |
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132 if (sec in loadedSecs) continue; // skip if it's already been loaded |
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133 loadedSecs[sec] = true; |
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134 |
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135 reader.read ([sec]); // Do the actual loading |
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136 |
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137 // Add dependancies to front of list: |
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138 secsToLoad = transl.depends ~ secsToLoad; |
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139 } |
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140 // When loop finishes, we're done loading. |
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141 } catch (MTException e) { |
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142 // If an error occurs, log a message but continue (strings will just be untranslated) |
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143 logger.error ("Mergetag exception occurred:"); |
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144 logger.error (e.msg); |
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145 } |
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146 |
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147 delete transl.depends; // Free memory |
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148 transl.depends = []; |
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149 |
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150 return transl; |
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151 } |
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152 |
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153 static this() { |
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154 logger = Log.getLogger ("mde.lookup.Translation"); |
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155 } |
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156 |
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157 /* Mergetag functionality. |
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158 * |
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159 * Merge tags in to entries, prefering existing values. |
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160 * Replace depends. |
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161 * |
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162 * User-defined type "entry": |
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163 * first two element is string and must exist |
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164 * second element is description and is optional |
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165 * third element is version and is optional |
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166 * no limit on number of elements to allow future extensions |
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167 */ |
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168 void addTag (char[] tp, ID id, char[] dt) { |
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169 if (tp == "entry") { |
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170 // If the tag already exists, don't replace it |
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171 if (cast(char[]) id in entries) return; |
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172 |
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173 Entry entry = deserialize!(Entry) (dt); |
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174 if (entry.name is null) { // This tag is invalid; ignore it |
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175 logger.error ("For name "~name~", L10n "~L10n~": tag with ID "~cast(char[])id~" has no data"); |
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176 return; |
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177 } |
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178 entries[cast(char[]) id] = entry; |
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179 } else if (tp == "char[][]") { |
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180 if (id == cast(ID)"depends") depends = cast(ID[]) parseTo!(char[][]) (dt); |
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181 } |
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182 } |
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183 |
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184 // This class is read-only and has no need of being saved. |
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185 void writeAll (ItemDelg) {} |
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186 |
74 | 187 /** This struct is used to store each translation entry. |
188 * | |
189 * Note that although each entry also has a version field, this is not loaded for general use. | |
190 */ | |
191 struct Entry { | |
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192 char[] name; // The translated string |
74 | 193 char[] desc; // An optional description |
194 } | |
195 | |
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196 private: |
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197 /* Sets name and L10n. |
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198 * |
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199 * Also ensures only load() can create instances. */ |
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200 this (char[] n, char[] l) { |
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201 name = n; |
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202 L10n = l; |
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203 } |
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204 |
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205 //BEGIN Data |
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206 static Logger logger; |
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207 |
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208 Entry[char[]] entries; // all entries |
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209 |
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210 ID[] depends; // dependancy sections (only used while loading) |
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211 //END Data |
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212 |
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213 debug (mdeUnitTest) unittest { |
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214 /* Relies on file: conf/L10n/i18nUnitTest.mtt |
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215 * Contents: |
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216 ********* |
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217 {MT01} |
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218 {test-1} |
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219 <entry|Str1=["Test 1"]> |
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220 <char[][]|depends=["test-2"]> |
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221 {test-2} |
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222 <entry|Str1=["Test 2"]> |
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223 <entry|Str2=["Test 3","Description",bogus,"entries",56]> |
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224 *********/ |
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225 |
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226 // Hack a specific locale... |
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227 // Also to allow unittest to run without init. |
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228 char[] currentL10n = miscOpts.L10n; |
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229 miscOpts.L10n = "test-1"; |
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230 |
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231 Translation transl = load ("unittest/Translation"); |
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232 |
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233 // Simple get-string, check dependancy's entry doesn't override |
74 | 234 assert (transl.entry ("Str1") == "Test 1"); |
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235 |
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236 // Entry included from dependancy with description |
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237 char[] desc; |
74 | 238 assert (transl.entry ("Str2", desc) == "Test 3"); |
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239 assert (desc == "Description"); |
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240 |
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241 // No entry: fallback to identifier string |
74 | 242 assert (transl.entry ("Str3") == "Str3"); |
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243 |
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244 // No checks for version info since it's not functionality of this module. |
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245 // Only check extra entries are allowed but ignored. |
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246 |
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247 // Restore |
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248 miscOpts.L10n = currentL10n; |
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249 |
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250 logger.info ("Unittest complete."); |
4608be19ebe2
Use OS paths (linux only for now), merging multiple paths. Init changes regarding options.
Diggory Hardy <diggory.hardy@gmail.com>
parents:
diff
changeset
|
251 } |
4608be19ebe2
Use OS paths (linux only for now), merging multiple paths. Init changes regarding options.
Diggory Hardy <diggory.hardy@gmail.com>
parents:
diff
changeset
|
252 } |