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mergetag: partially redesigned dataset and text reader classes. Changed text format. committer: Diggory Hardy <diggory.hardy@gmail.com>
author Diggory Hardy <diggory.hardy@gmail.com>
date Sat, 03 Nov 2007 15:15:43 +0000
parents 18491334a525
children 9a990644948c
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1 /// This module contains a minimal definition of a MergeTag DataSet.
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2 module mde.mergetag.dataset;
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3
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4 // package imports
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5 import mde.mergetag.exception;
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6
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7 // other mde imports
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8 import mde.text.util;
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9 import mde.text.parse;
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10 import mde.text.exception : TextParseException;
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11
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12 // tango imports
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13 import Util = tango.text.Util;
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14 import tango.util.log.Log : Log, Logger;
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15
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16 /** Typedef for data & section indexes (can be changed to ulong if necessary.) */
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17 typedef uint ID;
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18
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19 package struct MTFormatVersion {
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20 enum VERS : ubyte { // convenient list of all known file format versions
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21 INVALID = 0x00,
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22 MT01 = 0x01, // not yet final
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23 }
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24 /// The current MergeTag version
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25 static const VERS Current = VERS.MT01;
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26 static const char[2] CurrentString = "01";
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27
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28 static VERS parseString (char[] str)
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29 in {
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30 assert (str.length == 2);
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31 } body {
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32 if (str[0] == '0' && str[1] == '1') return VERS.MT01;
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33 else return VERS.INVALID;
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34 }
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35 }
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36
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37 private Logger logger;
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38 static this () {
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39 logger = Log.getLogger ("mde.mergetag.dataset");
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40 }
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41
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42 struct TextTag {
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43 TextTag opCall (char[] _tp, ID _id, char[] _dt) {
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44 TextTag ret;
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45 ret.tp = _tp;
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46 ret.id = _id;
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47 ret.dt = _dt;
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48 return ret;
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49 }
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50 char[] tp, dt;
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51 ID id;
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52 }
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53
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54 /**************************************************************************************************
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55 * Data class; contains a DataSection class instance for each loaded section of a file.
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56 *
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57 * Any class implementing DataSection may be used to store data; by default a DefaultData class is
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58 * used when reading a file. Another class may be used by creating the sections before reading the
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59 * file or passing the reader a function to create the sections (see Reader.dataSecCreator).
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60 *
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61 * Could be a struct, except that structs are value types (not reference types).
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62 */
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63 class DataSet
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64 {
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65 DataSection header; /// Header
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66 DataSection[ID] sec; /// Dynamic array of sections
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67
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68 /// Return a reference to the indexed item
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69 DataSection opIndex(ID i) {
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70 return sec[i];
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71 }
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72
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73 /// Template to return all sections of a child-class type.
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74 T[ID] getSections (T : DataSection) () {
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75 T[ID] ret;
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76 foreach (ID id, DataSection s; sec) {
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77 T x = cast(T) s;
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78 if (x) ret[id] = x; // if non-null
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79 }
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80 return ret;
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81 }
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82 }
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83
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84 /**
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85 * Interface for data storage classes, which contain all data-tags loaded from a single section of a
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86 * file.
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87 *
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88 * A class implementing this may implement the addTag function to do whatever it likes with the
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89 * data passed; DefaultData separates this data out into supported types and stores it
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90 * appropriately, while throwing an error when unsupported types are passed, but a different
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91 * implementation could filter out the tags desired and use them directly, while ignoring the rest.
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92 * The parse module provides a useful set of templated functions to
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93 * convert the data accordingly. It is advised to keep the type definitions as defined in the file-
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94 * format except for user-defined types.
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95 *
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96 * Another idea for a DataSection class:
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97 * Use a void*[ID] variable to store all data (may also need a type var for each item).
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98 * addTag should call a templated function which calls parse then casts to a void* and stores the data.
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99 * Use a templated get(T)(ID) method which checks the type and casts to T.
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100 */
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101 interface DataSection
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102 {
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103 /** Handles parsing of data items.
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104 *
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105 * Should throw an MTUnknownTypeException for unsupported types, after logging to logger.
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106 */
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107 void addTag (TypeInfo,ID,char[]);
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108 //void writeAll (Print!(char)); /// TBD
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109 }
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110
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111 /**
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112 * Default DataSection class.
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113 *
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114 * Supports all the basic types currently supported and array versions of
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115 * each (except no arrays of binary or string types; these are already arrays).
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116 */
2
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117 /* Due to a failure to use generic programming techniques for most of this (maybe because it's not
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118 * possible or maybe just because I don't know how to use templates properly) a lot of this code is
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119 * really horrible and has to refer to EVERY data member.
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120 * Be really careful if you add any items to this class.
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121 *
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122 * I really don't like having to do things like this, but it provides a lot of benefits such as no
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123 * need to store types and no need to check an argument's type for every access (this could be done
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124 * by throwing errors, but then an incorrect (perhaps hand-edited) data file could cause a lot of
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125 * errors to be thrown).
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126 */
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127 class DefaultData : DataSection
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128 {
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129 //BEGIN DATA
2
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130 /** Data Members
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131 *
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132 * These names are available for direct access.
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133 *
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134 * An alternative access method is to use the provided templates:
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135 * --------------------
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136 * template Arg(T) {
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137 * alias Name Arg;
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138 * }
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139 * --------------------
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140 *
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141 * Use with a mixin or directly:
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142 * --------------------
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143 * mixin Arg!(type);
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144 * auto x = Arg;
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145 *
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146 * type y = Arg!(type).Arg;
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147 * --------------------
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148 * Note: trying to use Arg!(type) to implicitly refer to Arg!(type).Arg causes compiler errors due to
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149 * --- alias Name Arg; ---
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150 * actually being a mixin.
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151 */
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152
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153 bool [ID] _bool;
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154 byte [ID] _byte; /// ditto
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155 short [ID] _short; /// ditto
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156 int [ID] _int; /// ditto
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157 long [ID] _long; /// ditto
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158 ubyte [ID] _ubyte; /// ditto
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159 ushort [ID] _ushort; /// ditto
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160 uint [ID] _uint; /// ditto
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161 ulong [ID] _ulong; /// ditto
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162
2
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163 char [ID] _char; /// ditto
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164
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165 float [ID] _float; /// ditto
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166 double [ID] _double; /// ditto
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167 real [ID] _real; /// ditto
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168
2
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169 bool[] [ID] _boolA; /// ditto
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170 byte[] [ID] _byteA; /// ditto
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171 short[] [ID] _shortA; /// ditto
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172 int[] [ID] _intA; /// ditto
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173 long[] [ID] _longA; /// ditto
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174 ubyte[] [ID] _ubyteA; /// ditto
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175 ushort[] [ID] _ushortA; /// ditto
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176 uint[] [ID] _uintA; /// ditto
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177 ulong[] [ID] _ulongA; /// ditto
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178
2
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179 char[] [ID] _charA; /// ditto
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180
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181 float[] [ID] _floatA; /// ditto
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182 double[] [ID] _doubleA; /// ditto
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183 real[] [ID] _realA; /// ditto
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184
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185 /** Alias names */
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186 alias _ubyteA _binary;
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187 alias _charA _string; /// ditto
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188 //END DATA
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189
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190 void addTag (TypeInfo ti, ID id, char[] dt) { /// for adding tags
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191 try {
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192 // crazy way of only writing one parameter on each line:
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193 mixin ( `if (ti == typeid(bool)) addTag_add!(bool) (id, dt);`
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194 ~ addTag_elifIsType_add!(byte)
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195 ~ addTag_elifIsType_add!(short)
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196 ~ addTag_elifIsType_add!(int)
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197 ~ addTag_elifIsType_add!(long)
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198 ~ addTag_elifIsType_add!(ubyte)
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199 ~ addTag_elifIsType_add!(ushort)
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200 ~ addTag_elifIsType_add!(uint)
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201 ~ addTag_elifIsType_add!(ulong)
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202 ~ addTag_elifIsType_add!(char)
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203 ~ addTag_elifIsType_add!(float)
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204 ~ addTag_elifIsType_add!(double)
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205 ~ addTag_elifIsType_add!(real)
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206 ~ addTag_elifIsType_add!(bool[])
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207 ~ addTag_elifIsType_add!(byte[])
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208 ~ addTag_elifIsType_add!(short[])
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209 ~ addTag_elifIsType_add!(int[])
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210 ~ addTag_elifIsType_add!(long[])
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211 ~ addTag_elifIsType_add!(ubyte[])
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212 ~ addTag_elifIsType_add!(ushort[])
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213 ~ addTag_elifIsType_add!(uint[])
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214 ~ addTag_elifIsType_add!(ulong[])
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215 ~ addTag_elifIsType_add!(char[])
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216 ~ addTag_elifIsType_add!(float[])
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217 ~ addTag_elifIsType_add!(double[])
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218 ~ addTag_elifIsType_add!(real[])
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219 );
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220 } catch (TextParseException) {
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221 // Just ignore it. A warning's already been logged.
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222 }
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223 }
2
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224 private template addTag_elifIsType_add(T) {
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225 const addTag_elifIsType_add = `else if (ti == typeid(`~T.stringof~`)) addTag_add!(`~T.stringof~`) (id, dt);` ;
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226 }
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227 private void addTag_add(T) (ID id, char[] dt) {
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228 Arg!(T).Arg[id] = parse!(T) (dt);
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229 }
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230
2
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231 void writeTags (out TextTag[] ret) {
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232 //ret.length = Arg!().length + ...;
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233
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234
1
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235 }
2
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236
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237 /* These make no attempt to check Arg is valid.
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238 * But if the symbol doesn't exist the complier will throw an error anyway, e.g.:
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239 * Error: identifier '_boolAA' is not defined
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240 */
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241 template Arg(T : T[]) {
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242 const ArgString = Arg!(T).ArgString ~ `A`;
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243 mixin(`alias `~ArgString~` Arg;`);
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244 }
2
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245 template Arg(T) {
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246 const ArgString = `_` ~ T.stringof;
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247 mixin(`alias `~ArgString~` Arg;`);
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248 }
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249 }
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250
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251 /+
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252 class TemplateData : DataSection
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253 {
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254 void addTag (char[] tp, ID id, char[] dt) {
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255 // runtime deduction of tp and aliasing?
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256 // CANNOT add data at runtime though.
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257 }
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258 // will this work? no idea.
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259 // templates can't be used to add non-static elements, so use a static array at index: this
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260 template Data(T,TemplateData* p) {
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261 static T[ID][TemplateData*] Data;
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262 }
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263 }
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78eb491bd642 mergetag: partially redesigned dataset and text reader classes. Changed text format.
Diggory Hardy <diggory.hardy@gmail.com>
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