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annotate mde/file/serialize.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 mde/mergetag/serialize.d@61ea26abe4dd
children ac1e3fd07275
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81
d8fccaa45d5f Moved file IO code from mde/mergetag to mde/file[/mergetag] and changed how some errors are caught.
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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 /**************************************************************************************************
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17 * Generic serialization templated function.
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18 *
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19 * Supports:
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20 * Associative arrays, arrays (inc. strings), structs, char types, bool, int types, float types.
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21 *
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22 * Examples:
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23 * ------------------------------------------------------------------------------------------------
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24 * // Basic examples:
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25 * Cout (serialize!(byte) (-13)).newline; // -13
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26 * Cout (serialize!(real) (2.56e11)).newline; // 2.55999999999999990000e+11
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27 * Cout (serialize!(double[]) ([0.0, 1.0, 2.0, 3.0])).newline; // [0.00000000000000000,1.00000000000000000,2.00000000000000000,3.00000000000000000]
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28 * Cout (serialize ([true,false,false])).newline; // [true,false,false]
70
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29 *
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30 * // String and ubyte[] special syntaxes (always used):
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31 * Cout (serialize ("A string.")).newline; // "A string." (including quotes)
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32 * Cout (serialize (cast(ubyte[]) [5u, 0xF1u, 0x10u])).newline; // 0x05f110
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33 *
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34 * // Associative arrays:
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35 * Cout (serialize ([-1:"negative one"[], 0:"zero", 1:"one"])).newline; // [0:"zero",1:"one",-1:"negative one"]
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36 *
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37 * // Structs:
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38 * struct S { int a = 5; double[int[]] x; }
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39 * S s;
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40 * Cout (serialize (s));
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41 *
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42 * // No limit on complexity...
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43 * char[] somethingComplicated = serialize!(real[][][bool[int[][]]]) (...);
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44 * ------------------------------------------------------------------------------------------------
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45 *
81
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46 * throws:
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47 * May throw a UnicodeException or an IllegalArgumentException.
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48 *
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49 * TODO: Optimize memory allocation (if possible?). Test best sizes for initial allocations
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50 * instead of merely guessing?
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51 *************************************************************************************************/
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52 //NOTE: in case of multiple formats, make this a dummy module importing both serialize modules,
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53 // or put all the code here.
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54 module mde.file.serialize;
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55 // Since serialize is never used in a module where deserialize is not used, save an import:
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56 public import mde.file.deserialize;
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58 // tango imports
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59 import tango.core.Traits;
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60 import tango.core.Exception : UnicodeException, IllegalArgumentException;
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61 import cInt = tango.text.convert.Integer;
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62 import cFloat = tango.text.convert.Float;
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63 import Utf = tango.text.convert.Utf;
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66 alias serialize parseFrom; // support the old name
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67
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68 // Formatting options, for where multiple formats are supported by the deserializer.
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70 // Output using the special binary notation (0x01F2AC instead of [01 ,0xF2, 0xAC])?
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71 const bool SPECIAL_BINARY_NOTATION = true;
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72
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73 // Output binary as true / false or 1 / 0 ?
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74 const bool BINARY_AS_WORDS = true;
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76
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77 char[] serialize(U) (U val) {
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78 // Associative arrays (NOTE: cannot use is() expression)
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79 static if (isAssocArrayType!(U)) { // generic associative array
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80 alias typeof(U.keys[0]) S;
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81 alias typeof(U.values[0]) T;
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82 char[] ret;
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83 // A guess, including values themselves and [,:] elements (must be at least 2).
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84 ret.length = val.length * (defLength!(T) + defLength!(S) + 2) + 2;
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85 ret[0] = '[';
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86 uint i = 1;
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87 foreach (S k, T v; val) {
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88 char[] s = serialize!(S) (k) ~ ":" ~ serialize!(T) (v);
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89 i += s.length;
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90 if (i+1 >= ret.length)
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91 ret.length = ret.length * 2; // check.
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92 ret[i-s.length .. i] = s;
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93 ret[i++] = ',';
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94 }
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95 if (i == 1) ++i; // special case - not overwriting a comma
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96 ret[i-1] = ']'; // replaces last comma
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97 return ret[0..i];
70
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98 }
79
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99 // Arrays
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100 else static if (is(U S == S[]) || isStaticArrayType!(U)) {
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101 alias typeof(U[0]) T;
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102
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103 static if (is(T == char)) { // string
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104 char[] ret = new char[val.length * 2 + 2]; // Initial storage. This should ALWAYS be enough.
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105 ret[0] = '"';
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106 uint i = 1;
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107 for (uint t = 0; t < val.length;) {
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108 // process a block of non-escapable characters
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109 uint s = t;
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110 while (t < val.length && !isEscapableChar(val[t]))
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111 ++t; // skip all non-escapable chars
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112 uint j = i + t - s;
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113 ret[i..j] = val[s..t]; // copy a block
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114 i = j;
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115 // process a block of escapable charaters
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116 while (t < val.length && isEscapableChar(val[t])) {
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117 ret[i++] = '\\'; // backslash; increment i
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118 ret[i++] = escapeChar(val[t++]); // character; increment i and t
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119 }
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120 }
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121 ret[i++] = '"';
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122 return ret[0..i];
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123 }
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124 else static if (is(T == wchar) || is(T == dchar)) { // wstring or dstring
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125 // May throw a UnicodeException; don't bother catching and rethrowing:
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126 return serialize!(char[]) (Utf.toString (val));
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127 }
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128 else static if (SPECIAL_BINARY_NOTATION && is(T == ubyte)) { // special binary notation
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129 // Note: To disable the usage of this special type, set SPECIAL_BINARY_NOTATION = false.
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130 static const char[16] digits = "0123456789abcdef";
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131
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132 char[] ret = new char[val.length * 2 + 2]; // exact length
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133 ret[0..2] = "0x";
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134 uint i = 2;
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135
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136 foreach (ubyte x; val) {
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137 ret[i++] = digits[x >> 4];
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138 ret[i++] = digits[x & 0x0F];
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139 }
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140 return ret;
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141 }
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142 else { // generic array
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143 char[] ret;
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144 // A guess, including commas and brackets (must be at least 2)
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145 ret.length = val.length * (defLength!(T) + 1) + 2;
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146 ret[0] = '[';
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147 uint i = 1;
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148 foreach (T x; val) {
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149 char[] s = serialize!(T) (x);
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150 i += s.length;
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151 if (i+1 >= ret.length)
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152 ret.length = ret.length * 2; // check length
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153 ret[i-s.length .. i] = s;
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154 ret[i++] = ',';
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155 }
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156 if (i == 1)
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157 ++i; // special case - not overwriting a comma
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158 ret[i-1] = ']'; // replaces last comma
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159 return ret[0..i];
70
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160 }
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161 }
79
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162 // Structs
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163 else static if (is(U == struct)) {
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164 char[] ret;
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165 // A very rough guess.
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166 ret.length = val.sizeof * 4;
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167 ret[0] = '{';
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168 uint i = 1;
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169 foreach (k, v; val.tupleof) {
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170 alias typeof(v) T;
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171 char[] s = serialize!(size_t) (k) ~ ":" ~ serialize!(T) (v);
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172 i += s.length;
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173 if (i+1 >= ret.length)
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174 ret.length = ret.length * 2; // check.
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175 ret[i-s.length .. i] = s;
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176 ret[i++] = ',';
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177 }
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178 if (i == 1) ++i; // special case - not overwriting a comma
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179 ret[i-1] = '}'; // replaces last comma
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180 return ret[0..i];
70
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181 }
79
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182 // Basic types
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183 else static if (is(U == char)) { // char (UTF-8 byte)
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184 // Note: if (val > 127) "is invalid UTF-8 single char". However we don't know
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185 // what this is for, in particular if it will be recombined with other chars later.
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186
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187 // Can't return reference to static array; so making it dynamic is cheaper than copying.
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188 char[] ret = new char[4]; // max length for an escaped char
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189 ret[0] = '\'';
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190
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191 if (!isEscapableChar (val)) {
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192 ret[1] = val;
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193 ret[2] = '\'';
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194 return ret[0..3];
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195 } else {
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196 ret[1] = '\\';
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197 ret[2] = escapeChar (val);
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198 ret[3] = '\'';
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199 return ret;
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200 }
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201 } else static if (is(U == wchar) ||
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202 is(U == dchar)) { // wchar or dchar (UTF-16/32 single char)
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203 // Note: only ascii can be converted. NOTE: convert to UTF-8 (multibyte) char?
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204 if (val <= 127u)
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205 return serialize!(char) (cast(char) val); // ASCII
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206 else throw new UnicodeException (
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207 "Error: unicode non-ascii character cannot be converted to a single UTF-8 char", 0);
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208 } else static if (is (U == bool)) { // boolean
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209 static if (BINARY_AS_WORDS) {
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210 if (val)
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211 return "true";
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212 else return "false";
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213 } else {
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214 if (val)
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215 return "1";
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216 else return "0";
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217 }
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218 } else static if (is (U : long)) { // any integer type, except char types and bool
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219 static if (is (U == ulong)) // ulong may not be supported properly
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220 if (val > cast(ulong) long.max)
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221 throw new IllegalArgumentException ("No handling available for ulong where value > long.max");
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222 return cInt.toString (val);
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223 } else static if (is (U : real)) { // any (real) floating point type
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224 char[] ret = new char[32]; // minimum allowed by assert in format
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225 return cFloat.format (ret, val, U.dig+2, 1);// from old C++ tests, U.dig+2 gives best(?) accuracy
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226 }
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227 // Unsupported
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228 else
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229 static assert (false, "Unsupported type: "~U.stringof);
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230 }
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231
79
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232 //BEGIN Utility funcs
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233 /* This template provides the initial length for strings for formatting various types. These strings
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234 * can be expanded; this value is intended to cover 90% of cases or so.
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235 *
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236 * NOTE: This template was intended to provide specialisations for different types.
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237 * This one value should do reasonably well for most types.
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238 */
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239 private {
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240 template defLength(T) { const uint defLength = 20; }
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241 template defLength(T : char) { const uint defLength = 4; }
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242 template defLength(T : bool) { const uint defLength = 5; }
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243 }
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244 private bool isEscapableChar (char c) {
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245 return ((c <= '\r' && c >= '\a') || c == '\"' || c == '\'' || c == '\\');
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246 }
79
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247 // Throws on unsupported escape sequences; however this should never happen within serialize.
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248 private char escapeChar (char c) {
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249 // This code was generated:
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250 if (c <= '\v') {
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251 if (c <= '\b') {
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252 if (c == '\a') {
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253 return 'a';
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254 } else if (c == '\b') {
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255 return 'b';
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256 }
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257 } else {
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258 if (c == '\t') {
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259 return 't';
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260 } else if (c == '\n') {
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261 return 'n';
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262 } else if (c == '\v') {
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263 return 'v';
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264 }
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265 }
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266 } else {
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267 if (c <= '\r') {
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268 if (c == '\f') {
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269 return 'f';
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270 } else if (c == '\r') {
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271 return 'r';
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272 }
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273 } else {
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274 if (c == '\"') {
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275 return '\"';
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276 } else if (c == '\'') {
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277 return '\'';
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278 } else if (c == '\\') {
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279 return '\\';
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280 }
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281 }
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282 }
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283
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284 // if we haven't returned:
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285 throw new IllegalArgumentException ("Internal error (escapeChar)");
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286 }
79
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287 //END Utility funcs
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288
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289
70
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290
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291 debug (UnitTest) {
79
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292 import tango.util.log.Log : Log, Logger;
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293
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294 private Logger logger;
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295 static this() {
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296 logger = Log.getLogger ("text.serialize");
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297 }
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298 unittest {
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299 // Utility
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300 bool throws (void delegate() dg) {
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301 bool r = false;
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302 try {
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303 dg();
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304 } catch (Exception e) {
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305 r = true;
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306 logger.info ("Exception caught: "~e.msg);
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307 }
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308 return r;
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309 }
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310 assert (!throws ({ int i = 5; }));
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311 assert (throws ({ throw new Exception ("Test - this exception should be caught"); }));
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312
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313 // Associative arrays
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314 char[] X = serialize!(char[][char]) (['a':cast(char[])"animal", 'b':['b','u','s']]);
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315 char[] Y = `['a':"animal",'b':"bus"]`;
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316 assert (X == Y);
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317
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318
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319 // Arrays
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320 // generic array stuff:
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321 assert (serialize!(double[]) ([1.0, 1.0e-10]) == `[1.00000000000000000,0.10000000000000000e-09]`);
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322 assert (serialize!(double[]) (cast(double[]) []) == `[]`); // empty array
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323
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324 // char[] conversions, with commas, escape sequences and multichar UTF8 characters:
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325 assert (serialize!(char[][]) ([ ".\""[], [',','\''] ,"!\b€" ]) == `[".\"",",\'","!\b€"]`);
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326
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327 // wchar[] and dchar[] conversions:
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328 // The characters were pretty-much pulled at random from unicode tables.
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329 assert (serialize!(wchar[]) ("Test string: ¶α؟अกሀ搀"w) == "\"Test string: ¶α؟अกሀ搀\"");
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330 assert (serialize!(dchar[]) ("Test string: ¶α؟अกሀ搀"d) == "\"Test string: ¶α؟अกሀ搀\"");
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331
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332
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333 static if (SPECIAL_BINARY_NOTATION)
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334 assert (serialize!(ubyte[]) (cast(ubyte[]) [0x01, 0xF2, 0xAC]) == `0x01f2ac`); // ubyte[] special notation
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335 else
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336 assert (serialize!(ubyte[]) (cast(ubyte[]) [0x01, 0xF2, 0xAC]) == `[1,242,172]`);
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337
70
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338
79
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339 // Structs
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340 struct Foo { int a = 9; char b = '\v'; float c; }
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341 struct Bar { Foo a,b; }
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342 static Foo foo1 = { a:150, b:'8', c:17.2f}, foo2;
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343 Bar bar;
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344 bar.a = foo1;
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345 bar.b = foo2;
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346 assert (serialize(bar) == "{0:{0:150,1:'8',2:1.72000007e+01},1:{0:9,1:'\\v',2:nan}}");
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347
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348
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349 // Basic Types
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350 // Character types
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351 assert (serialize!(char) ('\'') == "\'\\\'\'");
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352 assert (serialize!(wchar) ('X') == "'X'");
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353 assert (serialize!(dchar) ('X') == "'X'");
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354 assert (throws ({ char[] r = serialize!(wchar) ('£'); /* unicode U+00A3 */ }));
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355 assert (throws ({ char[] r = serialize!(dchar) ('£'); }));
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356
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357 // Bool
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358 static if (BINARY_AS_WORDS)
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359 assert (serialize(false) == "false");
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360 else
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361 assert (serialize(true) == "1");
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362
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363 // Integers
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364 assert (serialize (cast(byte) -5) == "-5");
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365 assert (serialize (cast(short) -32768) == "-32768");
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366 assert (serialize (-5) == "-5");
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367 assert (serialize (-9223372036854775807L) == "-9223372036854775807");
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368 assert (serialize (cast(ubyte) -1) == "255");
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369 assert (serialize (cast(ushort) -1) == "65535");
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370 assert (serialize!(uint) (-1) == "4294967295");
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371 assert (serialize (cast(ulong) 0x7FFF_FFFF_FFFF_FFFFLu) == "9223372036854775807");
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372 assert (serialize!(uint[]) ([0b0100u,0724,0xFa59c,0xFFFFFFFF,0]) ==
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373 "[4,468,1025436,4294967295,0]");
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374 assert (throws ({
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375 // ulong is not properly supported.
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376 // NOTE: this is something that should really work.
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377 char[] r = serialize!(ulong) (0x8FFF_FFFF_FFFF_FFFFLu);
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378 }));
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379
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380 // Floats
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381 // These numbers are not particularly meaningful:
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382 assert (serialize!(float) (0.0f) == "0.00000000");
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383 assert (serialize!(double) (-1e25) == "-1.00000000000000000e+25");
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384 assert (serialize!(real) (cast(real) 4.918e300) == "4.91800000000000000000e+300");
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385
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386 // Escape sequences (test conversion functions)
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387 assert (serialize ("\a\b\t\n\v\f\r\"\'\\") == `"\a\b\t\n\v\f\r\"\'\\"`);
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388
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389 logger.info ("Unittest complete.");
70
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390 }
79
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391 }