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annotate trunk/src/util/metastrings.d @ 629:d050e211402b

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Moved files in src/std/ to src/util/.
author Aziz K?ksal <aziz.koeksal@gmail.com>
date Fri, 11 Jan 2008 20:03:46 +0100
parents trunk/src/std/metastrings.d@33b566df6af4
children b091e8b0ef5c
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391
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1
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2 // Written in the D programming language.
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3
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4 /**
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5 * Templates with which to do compile time manipulation of strings.
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6 *
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7 * Macros:
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8 * WIKI = Phobos/StdMetastrings
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9 * Copyright:
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10 * Public Domain
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11 */
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12
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13 /*
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14 * Authors:
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15 * Walter Bright, Digital Mars, www.digitalmars.com
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16 * Don Clugston
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17 */
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18
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19 /*
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20 Note: this is not the original file!
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21 Modified by Aziz Köksal:
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22 Only changed some types from string to char[]
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23 */
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24
629
d050e211402b Moved files in src/std/ to src/util/.
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25 module util.metastrings;
391
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26
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27 /**
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28 * Formats constants into a string at compile time.
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29 * Analogous to std.string.format().
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30 * Parameters:
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31 * A = tuple of constants, which can be strings,
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32 * characters, or integral values.
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33 * Formats:
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34 * The formats supported are %s for strings, and %%
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35 * for the % character.
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36 * Example:
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37 * ---
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38 import std.metastrings;
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39 import std.stdio;
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40
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41 void main()
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42 {
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43 string s = Format!("Arg %s = %s", "foo", 27);
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44 writefln(s); // "Arg foo = 27"
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45 }
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46 * ---
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47 */
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48
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49 template Format(A...)
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50 {
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51 static if (A.length == 0)
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52 const char[] Format = "";
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53 else static if (is(typeof(A[0]) : char[]))
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54 const char[] Format = FormatString!(A[0], A[1..$]);
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55 //const char[] Format = FormatString!(A[0]);
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56 else
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57 const char[] Format = ToString!(A[0]) ~ Format!(A[1..$]);
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58 }
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59
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60 template FormatString(char[] F, A...)
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61 {
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62 static if (F.length == 0)
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63 const char[] FormatString = Format!(A);
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64 else static if (F.length == 1)
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65 const char[] FormatString = F[0] ~ Format!(A);
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66 else static if (F[0..2] == "%s")
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67 const char[] FormatString = ToString!(A[0]) ~ FormatString!(F[2..$],A[1..$]);
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68 else static if (F[0..2] == "%%")
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69 const char[] FormatString = "%" ~ FormatString!(F[2..$],A);
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70 else static if (F[0] == '%')
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71 static assert(0, "unrecognized format %" ~ F[1]);
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72 else
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73 const char[] FormatString = F[0] ~ FormatString!(F[1..$],A);
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74 }
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75
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76 /**
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77 * Convert constant argument to a string.
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78 */
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79
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80 template ToString(ulong U)
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81 {
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82 static if (U < 10)
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83 const char[] ToString = "" ~ cast(char)(U + '0');
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84 else
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85 const char[] ToString = ToString!(U / 10) ~ ToString!(U % 10);
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86 }
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87
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88 /// ditto
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89 template ToString(long I)
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90 {
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91 static if (I < 0)
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92 const char[] ToString = "-" ~ ToString!(cast(ulong)(-I));
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93 else
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94 const char[] ToString = ToString!(cast(ulong)I);
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95 }
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96
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97 static assert(ToString!(0x100000000) == "4294967296");
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98
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99 /// ditto
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100 template ToString(uint U)
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101 {
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102 const char[] ToString = ToString!(cast(ulong)U);
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103 }
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104
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105 /// ditto
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106 template ToString(int I)
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107 {
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108 const char[] ToString = ToString!(cast(long)I);
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109 }
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110
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111 /// ditto
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112 template ToString(ushort U)
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113 {
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114 const char[] ToString = ToString!(cast(ulong)U);
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115 }
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116
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117 /// ditto
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118 template ToString(short I)
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119 {
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120 const char[] ToString = ToString!(cast(long)I);
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121 }
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122
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123 /// ditto
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124 template ToString(ubyte U)
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125 {
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126 const char[] ToString = ToString!(cast(ulong)U);
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127 }
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128
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129 /// ditto
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130 template ToString(byte I)
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131 {
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132 const char[] ToString = ToString!(cast(long)I);
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133 }
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134
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135 /// ditto
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136 template ToString(bool B)
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137 {
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138 const char[] ToString = B ? "true" : "false";
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139 }
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140
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141 /// ditto
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142 template ToString(char[] S)
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143 {
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144 const char[] ToString = S;
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145 }
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146
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147 /// ditto
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148 template ToString(char C)
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149 {
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150 const char[] ToString = "" ~ C;
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151 }
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152
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153 unittest
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154 {
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155 char[] s = Format!("hel%slo", "world", -138, 'c', true);
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156 assert(s == "helworldlo-138ctrue");
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157 }
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158
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159
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160 /********
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161 * Parse unsigned integer literal from the start of string s.
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162 * returns:
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163 * .value = the integer literal as a string,
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164 * .rest = the string following the integer literal
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165 * Otherwise:
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166 * .value = null,
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167 * .rest = s
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168 */
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169
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170 template ParseUinteger(char[] s)
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171 {
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172 static if (s.length == 0)
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173 { const char[] value = "";
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174 const char[] rest = "";
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175 }
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176 else static if (s[0] >= '0' && s[0] <= '9')
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177 { const char[] value = s[0] ~ ParseUinteger!(s[1..$]).value;
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178 const char[] rest = ParseUinteger!(s[1..$]).rest;
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179 }
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180 else
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181 { const char[] value = "";
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182 const char[] rest = s;
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183 }
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184 }
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185
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186 /********
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187 * Parse integer literal optionally preceded by '-'
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188 * from the start of string s.
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189 * returns:
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190 * .value = the integer literal as a string,
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191 * .rest = the string following the integer literal
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192 * Otherwise:
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193 * .value = null,
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194 * .rest = s
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195 */
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196
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197 template ParseInteger(char[] s)
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198 {
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199 static if (s.length == 0)
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200 { const char[] value = "";
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201 const char[] rest = "";
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202 }
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203 else static if (s[0] >= '0' && s[0] <= '9')
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204 { const char[] value = s[0] ~ ParseUinteger!(s[1..$]).value;
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205 const char[] rest = ParseUinteger!(s[1..$]).rest;
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206 }
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207 else static if (s.length >= 2 &&
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208 s[0] == '-' && s[1] >= '0' && s[1] <= '9')
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209 { const char[] value = s[0..2] ~ ParseUinteger!(s[2..$]).value;
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210 const char[] rest = ParseUinteger!(s[2..$]).rest;
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211 }
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212 else
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213 { const char[] value = "";
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214 const char[] rest = s;
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215 }
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216 }
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217
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218 unittest
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219 {
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220 assert(ParseUinteger!("1234abc").value == "1234");
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221 assert(ParseUinteger!("1234abc").rest == "abc");
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222 assert(ParseInteger!("-1234abc").value == "-1234");
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223 assert(ParseInteger!("-1234abc").rest == "abc");
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224 }
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225