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annotate mde/mergetag/DefaultData.d @ 74:cee261eba249

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Minor tweaks.
author Diggory Hardy <diggory.hardy@gmail.com>
date Mon, 07 Jul 2008 15:54:47 +0100
parents 7fc0a8295c83
children 25cb7420dc91
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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 /** This module contains the DefaultData class, and some notes possibly useful for implementing
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17 * other types of DataSection.
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18 */
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19 module mde.mergetag.DefaultData;
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20
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21 public import mde.mergetag.iface.IDataSection;
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22 import mde.mergetag.exception;
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23
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24 import mde.mergetag.parse.parseTo : parseTo;
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25 import mde.mergetag.parse.parseFrom : parseFrom;
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27
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28 /**
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29 * Default DataSection class.
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30 *
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31 * Supports most of the basic types supported by D (excluding cent/ucent and imaginary/complex
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32 * types) and array versions of each of these types, plus arrays of strings.
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33 *
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34 * Extending the class to support more types, even custom types, shouldn't be particularly difficult
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35 * provided mde.text.parseTo and mde.text.parseFrom are extended to support the new types.
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36 */
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37 /* The implementation now uses a fair bit of generic programming. Adjusting the types supported
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38 * should be as simple as adjusting the list dataTypes, and possibly implemting new conversions in
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39 * parseFrom and parseTo if you add new types (e.g. for cent or imaginary/complex types, or user types).
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40 *
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41 * There shouldn't really be any need to adjust the implementation, except perhaps to add new
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42 * functions to the class (such as another type of output where the delegate used in writeAll isn't
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43 * enough).
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44 */
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45 class DefaultData : IDataSection
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46 {
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47 //BEGIN META
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48 /* These functions are used to generate code. Compile-time functions rather than templates are
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49 * used because they are easier to write and understand. Mixins are used to compile the resultant
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50 * code. Must be declared before used since forward references aren't supported for compile-time
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51 * functions. */
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52
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53 // Generate the correct name for each variable type.
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54 static char[] varName (char[] type) {
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55 char[] append = "";
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56 while (type.length >= 2 && type[$-2..$] == "[]") {
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57 type = type[0..$-2];
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58 append ~= "A";
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59 }
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60 return "_" ~ type ~ append;
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61 }
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62
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63 // Int-to-string converter, which may not be efficient but will run at compile time.
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64 static char[] int2str (uint i) {
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65 char[] ret;
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66 const digits = "0123456789";
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67 if (i == 0) ret = "0";
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68 else for (; i > 0; i /= 10) ret = digits[i%10] ~ ret;
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69 return ret;
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70 }
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71
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72 // Generate the code for variable declarations.
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73 static char[] declerations (char[][] types) {
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74 char[] ret = "";
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75 foreach (char[] type; types) ret ~= type ~ "[ID]\t" ~ varName(type) ~ ";\n";
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76 return ret;
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77 }
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78
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79 // Purely to add indentation. Could just return "" without affecting functionality.
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80 static char[] indent (uint i) {
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81 char[] ret;
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82 for (; i > 0; --i) ret ~= " ";
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83 // This is not executable at compile time:
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84 //ret.length = i * 4; // number of characters for each indentation
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85 //ret[] = ' '; // character to indent with
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86 return ret;
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87 }
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88
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89 /* Generates a binary search algorithm.
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90 *
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91 * Currently this is tailored to it's particular use (addTag). */
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92 static char[] binarySearch (char[] var, char[][] consts, int indents = 0) {
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93 if (consts.length > 3) {
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94 return indent(indents) ~ "if (" ~ var ~ " <= \"" ~ consts[$/2 - 1] ~ "\") {\n" ~
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95 binarySearch (var, consts[0 .. $/2], indents + 1) ~
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96 indent(indents) ~ "} else {\n" ~
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97 binarySearch (var, consts[$/2 .. $], indents + 1) ~
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98 indent(indents) ~ "}\n";
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99 } else {
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100 char[] ret;
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101 ret ~= indent(indents);
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102 foreach (c; consts) {
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103 ret ~= "if (" ~ var ~ " == \"" ~ c ~ "\") {\n" ~
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104 indent(indents+1) ~ varName(c) ~ "[id] = parseTo!(" ~ c ~ ") (dt);\n" ~
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105 indent(indents) ~ "} else ";
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106 }
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107 ret = ret[0..$-6] ~ '\n'; // remove last else
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108 return ret;
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109 }
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110 }
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111
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112 // Generates the code to write data members (writeAll).
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113 static char[] writeVars () {
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114 char[] code = "";
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115 foreach (i,type; dataTypes) {
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116 code ~= "foreach (id, dt; " ~ varName(type) ~ ") itemdlg (dataTypes[" ~ int2str(i) ~ "], id, parseFrom!(" ~ type ~ ")(dt));\n";
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117 }
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118 return code;
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119 }
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120 //END META
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121
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122 /** Data Members
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123 *
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124 * These types are all stored directly, as below, are available for direct access. The variable
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125 * names are created dynamically at compile-time based on the dataTypes list.
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126 * ------------------
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127 * int[ID] _int; // name is type prefixed by _
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128 * char[][ID] _charA; // [] is replaced by A
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129 * ------------------
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130 *
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131 * An alternative access method is to use the provided templates:
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132 * --------------------
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133 * template Arg(T) {
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134 * alias Name Arg;
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135 * }
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136 *
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137 * type y = Arg!(type).Arg; // example of use
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138 * --------------------
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139 * Note: trying to use Arg!(type) to implicitly refer to Arg!(type).Arg causes compiler errors
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140 * due to the "alias Name Arg;" statement actually being a mixin.
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141 */
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142 const char[][] dataTypes = ["bool","bool[]",
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143 "byte","byte[]",
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144 "char","char[]","char[][]",
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145 "double","double[]",
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146 "float","float[]",
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147 "int","int[]",
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148 "long","long[]",
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149 "real","real[]",
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150 "short","short[]",
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151 "ubyte","ubyte[]",
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152 "uint","uint[]",
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153 "ulong","ulong[]",
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154 "ushort","ushort[]"];
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155
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156 mixin (declerations (dataTypes)); // Declare all the variables.
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157
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158 void addTag (char[] type, ID id, char[] dt) { /// Supports all types listed in dataTypes.
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159 mixin (binarySearch ("type", dataTypes));
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160 }
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161
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162 void writeAll (ItemDelg itemdlg) { /// Supports all types listed in dataTypes.
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163 mixin (writeVars ());
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164 }
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165
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166 /* These make no attempt to check Arg is valid.
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167 * But if the symbol doesn't exist the complier will throw an error anyway, e.g.:
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168 * Error: identifier '_boolAA' is not defined
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169 */
74
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170 template ArgName (T : T[]) {
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171 const char[] ArgName = ArgName!(T)~`A`;
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172 }
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173 template ArgName (T) {
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174 const char[] ArgName = `_`~T.stringof;
14
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175 }
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176 template Arg(T) {
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177 mixin(`alias `~ArgName!(T)~` Arg;`);
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178 }
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179 }