Mercurial > projects > mde
annotate mde/resource/paths.d @ 15:4608be19ebe2
Use OS paths (linux only for now), merging multiple paths. Init changes regarding options.
Reorganised policies.txt a little.
Implemented mde.resource.paths to read config from appropriate paths (currently linux only).
Changed Init to load options before all other delegates are run and set logging level from options.
committer: Diggory Hardy <diggory.hardy@gmail.com>
author | Diggory Hardy <diggory.hardy@gmail.com> |
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date | Fri, 14 Mar 2008 11:39:45 +0000 |
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children | 5f90774ea1ef |
rev | line source |
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15
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1 /** Resource paths module. |
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2 * |
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3 * Internally to mde code other than code dealing directly with files and this module, paths are |
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4 * relative to the mde directory. This module transforms those paths to absolute paths. |
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5 * |
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6 * Additionally, the intention is to look for all files in two directories: the installation (i.e. |
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7 * main data) directory and a user directory (for user-specific configuration). Besides exposing |
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8 * both paths and checking in which valid files exist, this module provides some extra mergetag |
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9 * functionality to simplify correct reading and writing. |
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10 * |
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11 * Currently the paths are found as follows: (see codeDoc/paths.txt) |
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12 */ |
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13 /* Implementation note: |
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14 * All paths are stored internally as strings, rather than as an instance of FilePath/PathView once |
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15 * the FilePath has served its immediate purpose, since it's more convenient and creating new |
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16 * FilePaths for adjusted paths should be no slower than mutating existing ones. */ |
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17 module mde.resource.paths; |
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18 |
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19 import mde.exception; |
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20 import mde.mergetag.Reader; |
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21 import mde.mergetag.Writer; |
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22 import mde.mergetag.DataSet; |
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23 import mde.mergetag.exception; |
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24 |
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25 import tango.io.FilePath; |
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26 import tango.util.log.Log : Log, Logger; |
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27 import tango.stdc.stdlib; |
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28 import tango.stdc.stringz; |
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29 |
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30 /** Order to read files in. |
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31 * |
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32 * Values: HIGH_LOW, LOW_HIGH, HIGH_ONLY. */ |
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33 enum PRIORITY : byte { HIGH_LOW, LOW_HIGH, HIGH_ONLY } |
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34 |
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35 /** This struct has one instance for each "directory". |
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36 * |
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37 * It is the only item within this module that you should need to interact with. */ |
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38 struct mdeDirectory |
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39 { |
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40 /** Creates an MT reader for each file. |
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41 * |
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42 * Params: |
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43 * file = The file path and name relative to the mdeDirectory, without a suffix |
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44 * (e.g. "options") |
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45 * readOrder = Read the highest priority or lowest priority files first? For correct merging, |
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46 * this should be LOW_HIGH when newly-read items override old ones (as is the case |
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47 * with DefaultData) and HIGH_LOW when the first-read items survive. Thus override |
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48 * order needs to be the same for each section, except the header which is always |
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49 * read with LOW_HIGH order. |
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50 * Alternately, for files which shouldn't be |
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51 * merged where only the highest priority file should be read, pass HIGH_ONLY. |
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52 * ds = The dataset, as for mergetag. Note: all actual readers share one dataset. |
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53 * rdHeader = Read the headers for each file and merge if rdHeader == true. |
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54 */ |
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55 IReader makeMTReader (char[] file, PRIORITY readOrder, DataSet ds = null, bool rdHeader = false) |
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56 { |
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57 if (readOrder == PRIORITY.HIGH_ONLY) return makeReader (paths[pathsLen-1] ~ file, ds, rdHeader); |
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58 else return new mdeReader (file, readOrder, ds, rdHeader, paths); |
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59 } |
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60 |
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61 /** Creates an MT writer for file deciding on the best path to use. |
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62 * |
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63 * Params: |
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64 * file = The file path and name relative to the mdeDirectory, without a suffix |
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65 * (e.g. "options") |
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66 * ds = The dataset, as for mergetag. |
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67 */ |
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68 IWriter makeMTWriter (char[] file, DataSet ds = null) |
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69 { |
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70 // FIXME: use highest priority writable path |
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71 return makeWriter (paths[pathsLen-1] ~ file, ds, WriterMethod.Text); |
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72 } |
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73 |
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74 /** Check whether the given file exists under any path with either .mtt or .mtb suffix. */ |
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75 bool exists (char[] file) { |
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76 for (uint i = 0; i < pathsLen; ++i) { |
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77 if (FilePath (paths[i]~file~".mtt").exists) return true; |
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78 if (FilePath (paths[i]~file~".mtb").exists) return true; |
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79 } |
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80 return false; |
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81 } |
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82 |
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83 private: |
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84 |
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85 // Unconditionally add a path |
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86 void addPath (char[] path) { |
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87 paths[pathsLen++] = path~'/'; |
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88 } |
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89 |
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90 // Test a path and add if is a folder |
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91 void tryPath (char[] path) { |
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92 PathView pv = FilePath (path); |
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93 if (pv.exists && pv.isFolder) { |
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94 paths[pathsLen++] = path~'/'; |
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95 logger.info ("Path "~path~" is writable: " ~ (pv.isWritable ? "yes" : "no")); |
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96 } |
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97 } |
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98 |
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99 // Use a static array to store all possible paths with separate length counters. |
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100 // Lowest priority paths are first. |
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101 char[][MAX_PATHS] paths; |
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102 ubyte pathsLen = 0; |
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103 } |
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104 |
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105 /** These are the actual instances, one for each of the data and conf "directories". */ |
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106 mdeDirectory dataDir, confDir; |
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107 |
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108 //BEGIN Path resolution |
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109 static this() { |
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110 logger = Log.getLogger ("mde.resource.paths"); |
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111 |
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112 // NOTE: May fail. Currently I think I'll just let the exception halt execution. |
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113 resolvePaths(); |
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114 if (!dataDir.pathsLen) throw new mdeException ("Fatal: no data path found!"); |
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115 if (!confDir.pathsLen) throw new mdeException ("Fatal: no conf path found!"); |
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116 } |
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117 |
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118 private: |
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119 // The maximum number of paths for any one "directory". |
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120 // There are NO CHECKS that this is not exceeded. |
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121 const MAX_PATHS = 3; |
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122 |
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123 Logger logger; |
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124 |
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125 /* Try each path in succession, returning the first two exist and be a folder. Throws if none are. */ |
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126 char[] findPath (char[][] paths ...) { |
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127 foreach (path; paths) { |
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128 PathView pv = new FilePath (path); |
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129 if (pv.exists && pv.isFolder) return pv.toString; // got a valid path |
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130 } |
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131 // no valid path... |
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132 logger.fatal ("Unable to resolve a required path! The following were tried:"); |
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133 foreach (path; paths) logger.fatal ('\t' ~ path); |
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134 throw new mdeException ("Unable to resolve a required path (see log for details)."); |
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135 } |
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136 |
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137 // These are used several times: |
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138 const DATA = "/data"; |
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139 const CONF = "/conf"; |
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140 |
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141 version (linux) { |
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142 void resolvePaths () { |
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143 // Home directory: |
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144 char[] HOME = fromStringz (getenv (toStringz ("HOME"))); |
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145 |
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146 // Base paths: |
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147 char[] staticPath = findPath ("/usr/share/games/mde", "/usr/local/share/games/mde", "data"); |
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148 char[] userPath = findPath (HOME~"/.config/mde", HOME~"/.mde"); |
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149 |
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150 // Static data paths: |
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151 dataDir.addPath (staticPath); // we know this is valid anyway |
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152 dataDir.tryPath (userPath ~ DATA); |
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153 |
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154 // Configuration paths: |
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155 confDir.tryPath (staticPath ~ CONF); |
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156 confDir.tryPath ("/etc/mde"); |
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157 confDir.tryPath (userPath ~ CONF); |
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158 } |
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159 } else version (Windows) { |
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160 void resolvePaths () { |
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161 static assert (false, "No registry code"); |
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162 |
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163 // Base paths: |
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164 char[] userPath = `...`; |
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165 char[] installPath = `registryInstallPath or "."`; |
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166 char[] staticPath = findPath (installPath ~ DATA); |
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167 |
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168 // Static data paths: |
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169 dataDir.addPath[dataLength++] = staticPath; // we know this is valid anyway |
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170 dataDir.tryPath (userPath ~ DATA); |
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171 |
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172 // Configuration paths: |
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173 confDir.tryPath (staticPath.toString ~ CONF); |
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174 confDir.tryPath (installPath ~ CONF); |
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175 confDir.tryPath (userPath.toString ~ CONF); |
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176 } |
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177 } else { |
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178 static assert (false, "Platform is not linux or Windows: no support for paths on this platform yet!"); |
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179 } |
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180 //END Path resolution |
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181 |
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182 /** A special adapter for reading from multiple mergetag files with the same relative path to an |
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183 * mdeDirectory simultaneously. |
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184 */ |
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185 class mdeReader : IReader |
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186 { |
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187 private this (char[] file, PRIORITY readOrder, DataSet ds, bool rdHeader, char[][MAX_PATHS] paths) |
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188 in { assert (readOrder == PRIORITY.LOW_HIGH || readOrder == PRIORITY.HIGH_LOW); } |
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189 body { |
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190 rdOrder = readOrder; |
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191 if (ds is null) ds = new DataSet; |
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192 |
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193 foreach (path; paths) { |
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194 try { |
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195 IReader r = makeReader (path~file, ds, rdHeader); |
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196 |
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197 readers[readersLen++] = r; |
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198 } |
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199 catch (MTFileIOException) {} // Ignore errors regarding no file for now. |
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200 } |
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201 |
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202 if (readersLen == 0) { // totally failed to find any valid files |
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203 throw new MTFileIOException ("Unable to find the file: "~file[1..$]~"[.mtt|mtb]"); |
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204 } |
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205 |
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206 // This is simply the easiest way of adjusting the reading order: |
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207 if (readOrder == PRIORITY.HIGH_LOW) readers[0..readersLen].reverse; |
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208 } |
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209 |
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210 DataSet dataset () { /// Get the DataSet |
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211 return readers[0].dataset; // all readers share the same dataset |
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212 } |
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213 void dataset (DataSet ds) { /// Set the DataSet |
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214 for (uint i = 0; i < readersLen; ++i) readers[i].dataset (ds); |
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215 } |
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216 |
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217 void dataSecCreator (IDataSection delegate (ID) dsC) { /// Set the dataSecCreator |
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218 for (uint i = 0; i < readersLen; ++i) readers[i].dataSecCreator = dsC; |
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219 } |
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220 |
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221 /** Get identifiers for all sections. |
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222 * |
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223 * Note: the identifiers from all sections in all files are just strung together, starting with |
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224 * the highest-priority file. */ |
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225 ID[] getSectionNames () { |
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226 ID[] names; |
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227 for (int i = readersLen-1; i >= 0; --i) names ~= readers[i].getSectionNames; |
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228 return names; |
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229 } |
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230 void read () { /// Commence reading |
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231 for (uint i = 0; i < readersLen; ++i) readers[i].read(); |
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232 } |
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233 void read (ID[] secSet) { /// ditto |
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234 for (uint i = 0; i < readersLen; ++i) readers[i].read(secSet); |
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235 } |
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236 void read (View!(ID) secSet) { /// ditto |
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237 for (uint i = 0; i < readersLen; ++i) readers[i].read(secSet); |
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238 } |
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239 |
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240 private: |
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241 IReader[MAX_PATHS] readers; |
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242 ubyte readersLen = 0; |
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243 |
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244 PRIORITY rdOrder; |
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245 } |