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>
date Fri, 14 Mar 2008 11:39:45 +0000
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children 5f90774ea1ef
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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;
4608be19ebe2 Use OS paths (linux only for now), merging multiple paths. Init changes regarding options.
Diggory Hardy <diggory.hardy@gmail.com>
parents:
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245 }