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annotate mde/setup/paths.d @ 81:d8fccaa45d5f

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Moved file IO code from mde/mergetag to mde/file[/mergetag] and changed how some errors are caught.
author Diggory Hardy <diggory.hardy@gmail.com>
date Fri, 29 Aug 2008 11:59:43 +0100
parents 79a1809421aa
children 56c0ddd90193
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5f90774ea1ef 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.
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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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16 /** Resource paths module.
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17 *
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18 * Internally to mde code other than code dealing directly with files and this module, paths are
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19 * relative to the mde directory. This module transforms those paths to absolute paths.
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20 *
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21 * Additionally, the intention is to look for all files in two directories: the installation (i.e.
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22 * main data) directory and a user directory (for user-specific configuration). Besides exposing
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23 * both paths and checking in which valid files exist, this module provides some extra mergetag
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24 * functionality to simplify correct reading and writing.
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25 *
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26 * Currently the paths are found as follows: (see codeDoc/paths.txt)
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27 */
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28 /* Implementation note:
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29 * All paths are stored internally as strings, rather than as an instance of FilePath/FilePath once
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30 * the FilePath has served its immediate purpose, since it's more convenient and creating new
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31 * FilePaths for adjusted paths should be no slower than mutating existing ones. */
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32 module mde.setup.paths;
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34 import mde.exception;
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35 import mde.file.mergetag.Reader;
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36 import mde.file.mergetag.Writer;
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37 import mde.file.mergetag.DataSet;
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38 import mde.file.mergetag.exception;
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39
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40 import tango.io.Console;
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41 import tango.io.FilePath;
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42 import tango.sys.Environment;
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43 //import tango.scrapple.sys.win32.Registry; // Trouble getting this to work
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44
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45 /** Order to read files in.
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46 *
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47 * Values: HIGH_LOW, LOW_HIGH, HIGH_ONLY. */
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48 enum PRIORITY : byte { HIGH_LOW, LOW_HIGH, HIGH_ONLY }
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49
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50 /** This struct has one instance for each "directory".
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51 *
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52 * It is the only item within this module that you should need to interact with.
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53 *
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54 * In the case of confDir, the user path is guaranteed to exist (as highest priority path). */
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55 struct mdeDirectory
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56 {
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57 /** Creates an MT reader for each file.
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58 *
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59 * Params:
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60 * file = The file path and name relative to the mdeDirectory, without a suffix
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61 * (e.g. "options")
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62 * readOrder = Read the highest priority or lowest priority files first? For correct merging,
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63 * this should be LOW_HIGH when newly-read items override old ones (as is the case
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64 * with DefaultData) and HIGH_LOW when the first-read items survive. Thus override
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65 * order needs to be the same for each section, except the header which is always
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66 * read with LOW_HIGH order.
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67 * Alternately, for files which shouldn't be
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68 * merged where only the highest priority file should be read, pass HIGH_ONLY.
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69 * ds = The dataset, as for mergetag. Note: all actual readers share one dataset.
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70 * rdHeader = Read the headers for each file and merge if rdHeader == true.
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71 */
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72 IReader makeMTReader (char[] file, PRIORITY readOrder, DataSet ds = null, bool rdHeader = false)
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73 {
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74 FilePath[] files = getFiles (file, readOrder);
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75 if (files is null)
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76 throw new NoFileException ("Unable to find the file: "~file~"[.mtt|mtb]");
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78 return new mdeReader (files, ds, rdHeader);
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79 }
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80
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81 /** Creates an MT writer for file deciding on the best path to use.
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82 *
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83 * Params:
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84 * file = The file path and name relative to the mdeDirectory, without a suffix
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85 * (e.g. "options")
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86 * ds = The dataset, as for mergetag.
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87 */
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88 IWriter makeMTWriter (char[] file, DataSet ds = null)
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89 {
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90 // FIXME: use highest priority writable path
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91 return makeWriter (paths[pathsLen-1] ~ file, ds, WriterMethod.Text);
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92 }
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93
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94 /** Returns a string listing the file name or names (if readOrder is not HIGH_ONLY and multiple
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95 * matches are found), or "no file found". Intended for user output only. */
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96 char[] getFileName (char[] file, PRIORITY readOrder)
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97 {
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98 FilePath[] files = getFiles (file, readOrder);
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99 if (files is null)
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100 return "no file found";
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101
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102 char[] ret = files[0].toString;
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103 foreach (f; files[1..$])
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104 ret ~= ", " ~ f.toString;
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105 return ret;
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106 }
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107
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108 /// Print all paths found.
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109 static void printPaths () {
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110 Cout ("Data paths found:");
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111 dataDir.coutPaths;
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112 Cout ("\nConf paths found:");
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113 confDir.coutPaths;
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114 Cout ("\nLog file directory:\n\t")(logDir).newline;
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115 }
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116
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117 private:
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118 FilePath[] getFiles (char[] filename, PRIORITY readOrder)
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119 {
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120 FilePath[] ret;
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121
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122 debug (mdeUnitTest) {
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diff changeset
123 /* Alternate approach - just try from current directory.
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124 * Really just for unittests, but with the if condition it shouldn't break anything else. */
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diff changeset
125 if (pathsLen == 0) {
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126 FilePath file = findFile (filename);
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127 if (file !is null)
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128 ret ~= file;
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129 return ret;
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130 }
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131 }
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132
47
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133 if (readOrder == PRIORITY.LOW_HIGH) {
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134 for (size_t i = 0; i < pathsLen; ++i) {
67
108d123238c0 Changes to work with tango r3700 (post 0.99.6).
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135 FilePath file = findFile (paths[i]~filename);
47
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136 if (file !is null)
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137 ret ~= file;
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138 }
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139 } else {
75
25cb7420dc91 A massive overhaul/rewrite for the gui's data management and setup code. Currently much that was working is broken.
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140 assert (readOrder == PRIORITY.HIGH_LOW ||
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diff changeset
141 readOrder == PRIORITY.HIGH_ONLY );
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142
47
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143 for (int i = pathsLen - 1; i >= 0; --i) {
67
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144 FilePath file = findFile (paths[i]~filename);
78
79a1809421aa Widget data saving reimplemented for the new data system. (Now grid layout widgets remember their row & column sizes.)
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diff changeset
145 if (file !is null)
47
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146 ret ~= file;
78
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147 if (readOrder == PRIORITY.HIGH_ONLY) break;
47
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148 }
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149 }
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diff changeset
150 return ret;
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151 }
15
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152
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153 // Unconditionally add a path
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154 void addPath (char[] path) {
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155 paths[pathsLen++] = path~'/';
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156 }
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157
18
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158 // Test a path and add if is a folder.
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159 bool tryPath (char[] path, bool create = false) {
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160 FilePath fp = FilePath (path);
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161 if (fp.exists && fp.isFolder) {
15
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162 paths[pathsLen++] = path~'/';
18
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163 return true;
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164 } else if (create) {
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165 try {
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166 fp.create;
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167 paths[pathsLen++] = fp.toString~'/';
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168 return true;
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diff changeset
169 } catch (Exception e) {
28
b5fadd8d930b Small addition to GUI, paths work-around for Windows.
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170 // No logging avaiable yet: Use Stdout/Cout
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171 Cout ("Creating path "~path~" failed:" ~ e.msg).newline;
18
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172 }
15
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173 }
18
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diff changeset
174 return false;
15
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175 }
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176
53
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diff changeset
177 void coutPaths () {
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178 if (pathsLen) {
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179 for (size_t i = 0; i < pathsLen; ++i)
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180 Cout ("\n\t" ~ paths[i]);
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181 } else
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182 Cout ("[none]");
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183 }
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184
15
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185 // Use a static array to store all possible paths with separate length counters.
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186 // Lowest priority paths are first.
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187 char[][MAX_PATHS] paths;
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188 ubyte pathsLen = 0;
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189 }
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190
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191 /** These are the actual instances, one for each of the data and conf "directories". */
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192 mdeDirectory dataDir, confDir;
18
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193 char[] logDir;
15
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194
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195 //BEGIN Path resolution
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parents:
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196 // These are used several times:
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197 const DATA = "/data";
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198 const CONF = "/conf";
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199
28
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diff changeset
200 /** Find at least one path for each required directory.
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diff changeset
201 *
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202 * Note: the logger cannot be used yet, so only output is exception messages. */
44
07bd1a09e161 Started implementing text rendering.
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diff changeset
203 // FIXME: use tango/sys/Environment.d
15
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204 version (linux) {
53
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diff changeset
205 // base-path not used on posix
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diff changeset
206 void resolvePaths (char[] = null) {
15
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207 // Home directory:
53
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diff changeset
208 char[] HOME = Environment.get("HOME", ".");
15
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209
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210 // Base paths:
18
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211 // Static data (must exist):
67
108d123238c0 Changes to work with tango r3700 (post 0.99.6).
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diff changeset
212 FilePath staticPath =
53
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diff changeset
213 findPath (false, "/usr/share/games/mde", "/usr/local/share/games/mde", "data");
18
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parents: 17
diff changeset
214 // Config (can just use defaults if necessary, so long as we can save afterwards):
67
108d123238c0 Changes to work with tango r3700 (post 0.99.6).
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parents: 63
diff changeset
215 FilePath userPath = findPath (true, HOME~"/.config/mde", HOME~"/.mde");
15
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216
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217 // Static data paths:
18
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diff changeset
218 dataDir.addPath (staticPath.toString); // we know this is valid anyway
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219 dataDir.tryPath (userPath.toString ~ DATA);
53
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220 if (extraDataPath) dataDir.tryPath (extraDataPath);
18
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diff changeset
221 if (!dataDir.pathsLen) throw new mdeException ("Fatal: no data path found!");
15
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222
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223 // Configuration paths:
18
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diff changeset
224 confDir.tryPath (staticPath.toString ~ CONF);
24
32eff0e01c05 Only locally-changed options are stored in user-config now. Log levels revised.
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parents: 18
diff changeset
225 confDir.tryPath ("/etc/mde");
32eff0e01c05 Only locally-changed options are stored in user-config now. Log levels revised.
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parents: 18
diff changeset
226 confDir.tryPath (userPath.toString ~ CONF, true);
53
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diff changeset
227 if (extraConfPath) confDir.tryPath (extraConfPath);
18
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diff changeset
228 if (!confDir.pathsLen) throw new mdeException ("Fatal: no conf path found!");
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diff changeset
229
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diff changeset
230 // Logging path:
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diff changeset
231 logDir = userPath.toString;
15
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232 }
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233 } else version (Windows) {
53
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diff changeset
234 void resolvePaths (char[] base = "./") {
28
b5fadd8d930b Small addition to GUI, paths work-around for Windows.
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diff changeset
235 //FIXME: Get path from registry
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diff changeset
236 //FIXME: Get user path (Docs&Settings/USER/Local Settings/Application data/mde)
53
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237 //http://www.dsource.org/projects/tango/forums/topic/187
15
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238
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239 // Base paths:
67
108d123238c0 Changes to work with tango r3700 (post 0.99.6).
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diff changeset
240 FilePath installPath = findPath (false, base);
108d123238c0 Changes to work with tango r3700 (post 0.99.6).
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parents: 63
diff changeset
241 FilePath staticPath = findPath (false, installPath.append("data").toString);
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diff changeset
242 FilePath userPath = findPath (true, installPath.append("user").toString); // FIXME: see above
15
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243
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244 // Static data paths:
18
56a42ec95024 Changes to Init and logging.
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parents: 17
diff changeset
245 dataDir.addPath (staticPath.toString); // we know this is valid anyway
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parents: 17
diff changeset
246 dataDir.tryPath (userPath.toString ~ DATA);
53
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diff changeset
247 if (extraDataPath) dataDir.tryPath (extraDataPath);
18
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diff changeset
248 if (!dataDir.pathsLen) throw new mdeException ("Fatal: no data path found!");
28
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diff changeset
249
15
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250 // Configuration paths:
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251 confDir.tryPath (staticPath.toString ~ CONF);
53
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diff changeset
252 confDir.tryPath (installPath.append("user").toString);
28
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253 confDir.tryPath (userPath.toString ~ CONF, true);
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254 if (extraConfPath) confDir.tryPath (extraConfPath);
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255 if (!confDir.pathsLen) throw new mdeException ("Fatal: no conf path found!");
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256
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257 // Logging path:
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258 logDir = userPath.toString;
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259 }
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260 } else {
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261 static assert (false, "Platform is not linux or Windows: no support for paths on this platform yet!");
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262 }
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263
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264 /// For command line args: these paths are added if non-null, with highest priority.
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265 char[] extraDataPath, extraConfPath;
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266
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267 private {
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268 class PathException : mdeException {
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269 this(char[] msg) {
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270 super (msg);
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271 }
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272 }
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273
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274 // The maximum number of paths for any one "directory".
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275 // There are NO CHECKS that this is not exceeded.
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276 const MAX_PATHS = 4;
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277
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278 /* Try each path in succession, returning the first to exist and be a folder.
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279 * If none are valid and create is true, will try creating each in turn.
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280 * If still none are valid, throws. */
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281 FilePath findPath (bool create, char[][] paths ...) {
53
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282 FilePath[] fps;
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283 fps.length = paths.length;
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284 foreach (i,path; paths) {
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285 FilePath pv = new FilePath (path);
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286 if (pv.exists && pv.isFolder) return pv; // got a valid path
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287 fps[i] = pv;
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288 }
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289 if (create) { // try to create a folder, using each path in turn until succesful
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290 foreach (fp; fps) {
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291 try {
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292 return fp.create;
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293 }
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294 catch (Exception e) {}
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295 }
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296 }
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297 // no valid path...
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298 char[] msg = "Unable to find"~(create ? " or create" : "")~" a required path! The following were tried:";
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299 foreach (path; paths) msg ~= " \"" ~ path ~ '\"';
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300 throw new PathException (msg);
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301 }
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302 //END Path resolution
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303
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304 /** A special adapter for reading from multiple mergetag files with the same relative path to an
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305 * mdeDirectory simultaneously.
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306 */
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307 class mdeReader : IReader
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308 {
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309 private this (FilePath[] files, DataSet ds, bool rdHeader)
53
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310 in {
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311 assert (files !is null, "mdeReader.this: files is null");
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312 } body {
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313 // Don't let sub-readers create their own, separate, datasets:
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314 if (ds is null) ds = new DataSet;
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315
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316 foreach (file; files) {
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317 IReader r = makeReader (file, ds, rdHeader);
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318
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319 readers[readersLen++] = r;
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320 }
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321 }
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322
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323 DataSet dataset () { /// Get the DataSet
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324 return readers[0].dataset; // all readers share the same dataset
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325 }
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326 void dataset (DataSet ds) { /// Set the DataSet
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327 for (uint i = 0; i < readersLen; ++i) readers[i].dataset (ds);
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328 }
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329
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330 void dataSecCreator (IDataSection delegate (ID) dsC) { /// Set the dataSecCreator
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331 for (uint i = 0; i < readersLen; ++i) readers[i].dataSecCreator = dsC;
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332 }
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333
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334 /** Get identifiers for all sections.
53
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335 *
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336 * Note: the identifiers from all sections in all files are just strung together, starting with
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337 * the highest-priority file. */
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338 ID[] getSectionNames () {
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339 ID[] names;
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340 for (int i = readersLen-1; i >= 0; --i) names ~= readers[i].getSectionNames;
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341 return names;
53
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342 }
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343 void read () { /// Commence reading
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344 for (uint i = 0; i < readersLen; ++i) readers[i].read();
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345 }
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346 void read (ID[] secSet) { /// ditto
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347 for (uint i = 0; i < readersLen; ++i) readers[i].read(secSet);
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348 }
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349 void read (View!(ID) secSet) { /// ditto
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350 for (uint i = 0; i < readersLen; ++i) readers[i].read(secSet);
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351 }
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352
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353 private:
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354 IReader[MAX_PATHS] readers;
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355 ubyte readersLen = 0;
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356
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357 PRIORITY rdOrder;
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358 }
75
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359 }
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360
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361 /// Thrown when makeMTReader couldn't find a file.
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362 class NoFileException : MTFileIOException {
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363 this (char[] msg) {
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364 super(msg);
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365 }
53
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366 }