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annotate mde/mergetag/DefaultData.d @ 14:0047b364b6d9

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Changed much of the mergetag structure and some functionality. First tests on windows. Changes to mergetag Reader methods. New functionality allowing a dataSecCreator to cause sections to be skipped. Moved several of the mergetag modules and some of their contents around. Moved all interfaces to separate modules in iface/ . IReader & IWriter interfaces exist; MTTReader, MTBReader, MTTWriter, MTBWriter & DualWriter all now exist and implement IReader/IWriter (although the MTB variants are dummy classes); makeReader & makeWriter should both be fully functional. Tested building on windows with partial success (works but window won't open). Included a temporary hack from windows to get supported resolutions information. committer: Diggory Hardy <diggory.hardy@gmail.com>
author Diggory Hardy <diggory.hardy@gmail.com>
date Fri, 07 Mar 2008 17:51:02 +0000
parents
children 5f90774ea1ef
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14
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1 /** This module contains the DefaultData class, and some notes possibly useful for implementing
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2 * other types of DataSection.
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3 */
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4 module mde.mergetag.DefaultData;
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5
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6 public import mde.mergetag.iface.IDataSection;
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7 import mde.mergetag.exception;
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8
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9 import tango.scrapple.text.convert.parseTo : parseTo;
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10 import tango.scrapple.text.convert.parseFrom : parseFrom;
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11
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12
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13 /**
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14 * Default DataSection class.
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15 *
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16 * Supports most of the basic types supported by D (excluding cent/ucent and imaginary/complex
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17 * types) and array versions of each of these types, plus arrays of strings.
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18 *
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19 * Extending the class to support more types, even custom types, shouldn't be particularly difficult
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20 * provided mde.text.parseTo and mde.text.parseFrom are extended to support the new types.
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21 */
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22 /* The implementation now uses a fair bit of generic programming. Adjusting the types supported
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23 * should be as simple as adjusting the list dataTypes, and possibly implemting new conversions in
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24 * parseFrom and parseTo if you add new types (e.g. for cent or imaginary/complex types, or user types).
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25 *
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26 * There shouldn't really be any need to adjust the implementation, except perhaps to add new
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27 * functions to the class (such as another type of output where the delegate used in writeAll isn't
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28 * enough).
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29 */
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30 class DefaultData : IDataSection
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31 {
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32 //BEGIN META
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33 /* These functions are used to generate code. Compile-time functions rather than templates are
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34 * used because they are easier to write and understand. Mixins are used to compile the resultant
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35 * code. Must be declared before used since forward references aren't supported for compile-time
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36 * functions. */
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37
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38 // Generate the correct name for each variable type.
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39 static char[] varName (char[] type) {
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40 char[] append = "";
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41 while (type.length >= 2 && type[$-2..$] == "[]") {
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42 type = type[0..$-2];
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43 append ~= "A";
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44 }
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45 return "_" ~ type ~ append;
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46 }
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47
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48 // Int-to-string converter, which may not be efficient but will run at compile time.
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49 static char[] int2str (uint i) {
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50 char[] ret;
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51 const digits = "0123456789";
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52 if (i == 0) ret = "0";
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53 else for (; i > 0; i /= 10) ret = digits[i%10] ~ ret;
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54 return ret;
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55 }
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56
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57 // Generate the code for variable declarations.
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58 static char[] declerations (char[][] types) {
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59 char[] ret = "";
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60 foreach (char[] type; types) ret ~= type ~ "[ID]\t" ~ varName(type) ~ ";\n";
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61 return ret;
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62 }
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63
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64 // Purely to add indentation. Could just return "" without affecting functionality.
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65 static char[] indent (uint i) {
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66 char[] ret;
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67 for (; i > 0; --i) ret ~= " ";
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68 // This is not executable at compile time:
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69 //ret.length = i * 4; // number of characters for each indentation
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70 //ret[] = ' '; // character to indent with
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71 return ret;
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72 }
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73
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74 /* Generates a binary search algorithm.
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75 *
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76 * Currently this is tailored to it's particular use (addTag). */
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77 static char[] binarySearch (char[] var, char[][] consts, int indents = 0) {
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78 if (consts.length > 3) {
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79 return indent(indents) ~ "if (" ~ var ~ " <= \"" ~ consts[$/2 - 1] ~ "\") {\n" ~
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80 binarySearch (var, consts[0 .. $/2], indents + 1) ~
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81 indent(indents) ~ "} else {\n" ~
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82 binarySearch (var, consts[$/2 .. $], indents + 1) ~
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83 indent(indents) ~ "}\n";
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84 } else {
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85 char[] ret;
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86 ret ~= indent(indents);
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87 foreach (c; consts) {
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88 ret ~= "if (" ~ var ~ " == \"" ~ c ~ "\") {\n" ~
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89 indent(indents+1) ~ varName(c) ~ "[id] = parseTo!(" ~ c ~ ") (dt);\n" ~
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90 indent(indents) ~ "} else ";
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91 }
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92 ret = ret[0..$-6] ~ '\n'; // remove last else
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93 return ret;
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94 }
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95 }
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96
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97 // Generates the code to write data members (writeAll).
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98 static char[] writeVars () {
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99 char[] code = "";
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100 foreach (i,type; dataTypes) {
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101 code ~= "foreach (id, dt; " ~ varName(type) ~ ") itemdlg (dataTypes[" ~ int2str(i) ~ "], id, parseFrom!(" ~ type ~ ")(dt));\n";
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102 }
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103 return code;
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104 }
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105 //END META
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106
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107 /** Data Members
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108 *
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109 * These types are all stored directly, as below, are available for direct access. The variable
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110 * names are created dynamically at compile-time based on the dataTypes list.
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111 * ------------------
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112 * int[ID] _int; // name is type prefixed by _
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113 * char[][ID] _charA; // [] is replaced by A
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114 * ------------------
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115 *
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116 * An alternative access method is to use the provided templates:
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117 * --------------------
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118 * template Arg(T) {
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119 * alias Name Arg;
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120 * }
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121 *
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122 * type y = Arg!(type).Arg; // example of use
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123 * --------------------
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124 * Note: trying to use Arg!(type) to implicitly refer to Arg!(type).Arg causes compiler errors
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125 * due to the "alias Name Arg;" statement actually being a mixin.
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126 */
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127 const char[][] dataTypes = ["bool","bool[]",
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128 "byte","byte[]",
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129 "char","char[]","char[][]",
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130 "double","double[]",
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131 "float","float[]",
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132 "int","int[]",
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133 "long","long[]",
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134 "real","real[]",
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135 "short","short[]",
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136 "ubyte","ubyte[]",
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137 "uint","uint[]",
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138 "ulong","ulong[]",
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139 "ushort","ushort[]"];
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140
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141 mixin (declerations (dataTypes)); // Declare all the variables.
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142
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143 void addTag (char[] type, ID id, char[] dt) { /// Supports all types listed in dataTypes.
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144 mixin (binarySearch ("type", dataTypes));
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145 }
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146
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147 void writeAll (ItemDelg itemdlg) { /// Supports all types listed in dataTypes.
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148 mixin (writeVars ());
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149 }
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150
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151 /* These make no attempt to check Arg is valid.
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152 * But if the symbol doesn't exist the complier will throw an error anyway, e.g.:
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153 * Error: identifier '_boolAA' is not defined
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154 */
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155 template Arg(T : T[]) {
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156 const ArgString = Arg!(T).ArgString ~ `A`;
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157 mixin(`alias `~ArgString~` Arg;`);
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158 }
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159 template Arg(T) {
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160 const ArgString = `_` ~ T.stringof;
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161 mixin(`alias `~ArgString~` Arg;`);
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162 }
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163 }