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288
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1 /**
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2 * CTFE String routines.
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3 *
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4 * Authors: Daniel Keep <daniel.keep@gmail.com>
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5 * Copyright: See LICENSE.
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6 */
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7 module qt.qtd.ctfe.String;
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8
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9 import Integer = qt.qtd.ctfe.Integer;
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10
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11 private
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12 {
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13 const HEX_CHARS = "0123456789abcdef";
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14 }
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15
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16 /**
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17 * Escapes a string into an equivalent string literal.
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18 *
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19 * Params:
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20 * str = string to escape.
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21 * aggressive = if set, the function will escape all non-printing
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22 * characters, non-space whitespace and newlines. Defaults
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23 * to true.
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24 * Returns:
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25 * Escaped string literal.
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26 */
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27 string escape_ctfe(string str, bool aggressive=true)
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28 {
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29 string head = "";
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30
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31 foreach( i,c ; str )
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32 {
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33 if( c == '"' || c == '\\' || c == '\0' )
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34 {
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35 head = "\""~str[0..i];
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36 str = str[i..$];
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37 break;
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38 }
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39
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40 if( aggressive )
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41 {
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42 if( c < 0x20 || c == 0x7f )
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43 {
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44 head = "\""~str[0..i];
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45 str = str[i..$];
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46 break;
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47 }
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48 }
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49 }
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50
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51 if( head.length == 0 )
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52 return "\"" ~ str ~ "\"";
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53
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54 string tail = "";
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55
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56 foreach( c ; str )
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57 {
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58 if( c == '"' )
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59 tail ~= `\"`;
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60
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61 else if( c == '\\' )
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62 tail ~= "\\\\";
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63
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64 else if( c == '\0' )
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65 tail ~= `\0`;
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66
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67 else if( aggressive )
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68 {
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69 switch( c )
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70 {
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71 case '\?':
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72 tail ~= `\?`;
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73 break;
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74
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75 case '\a':
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76 tail ~= `\a`;
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77 break;
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78
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79 case '\b':
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80 tail ~= `\b`;
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81 break;
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82
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83 case '\f':
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84 tail ~= `\f`;
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85 break;
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86
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87 case '\n':
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88 tail ~= `\n`;
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89 break;
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90
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91 case '\r':
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92 tail ~= `\r`;
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93 break;
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94
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95 case '\t':
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96 tail ~= `\t`;
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97 break;
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98
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99 case '\v':
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100 tail ~= `\v`;
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101 break;
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102
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103 default:
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104 if( c < 0x20 || c == 0x75 )
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105 {
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106 tail ~= `\x`;
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107 tail ~= HEX_CHARS[c/0xf];
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108 tail ~= HEX_CHARS[c&0xf];
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109 }
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110 else
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111 tail ~= c;
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112 }
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113 }
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114 else
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115 tail ~= c;
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116 }
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117
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118 return head ~ tail ~ "\"";
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119 }
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120
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121 version( Unittest )
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122 {
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123 static assert( escape_ctfe("abc") == "\"abc\"" );
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124 static assert( escape_ctfe("a\"c") == "\"a\\\"c\"" );
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125 }
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126
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127 /**
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128 * Turns an array of bytes into a hexadecimal string.
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129 *
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130 * Params:
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131 * arr = array to hexify.
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132 * grouping = if non-zero, specifies after how many bytes to insert a
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133 * space.
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134 * Returns:
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135 * String of hex bytes.
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136 */
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137
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138 string hexify_ctfe(ubyte[] arr, int grouping = 0)
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139 {
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140 string r = "";
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141 int bytes = grouping;
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142 foreach( b ; arr )
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143 {
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144 if( bytes == 0 && grouping > 0 )
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145 {
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146 r ~= ' ';
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147 bytes = grouping;
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148 }
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149
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150 auto bh = b/16;
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151 auto bl = b&15;
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152
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153 assert( bh < 16 );
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154 assert( bl < 16 );
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155
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156 r ~= HEX_CHARS[bh];
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157 r ~= HEX_CHARS[bl];
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158
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159 if( grouping > 0 )
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160 -- bytes;
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161 }
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162 return r;
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163 }
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164
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165 /// ditto
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166
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167 string hexify_ctfe(string arr, int grouping = 0)
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168 {
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169 string r = "";
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170 int bytes = grouping;
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171 foreach( b ; arr )
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172 {
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173 if( bytes == 0 && grouping > 0 )
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174 {
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175 r ~= ' ';
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176 bytes = grouping;
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177 }
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178
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179 auto bh = b/16;
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180 auto bl = b&15;
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181
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182 assert( bh < 16 );
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183 assert( bl < 16 );
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184
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185 r ~= HEX_CHARS[bh];
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186 r ~= HEX_CHARS[bl];
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187
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188 if( grouping > 0 )
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189 -- bytes;
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190 }
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191 return r;
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192 }
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193
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194 version( Unittest )
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195 {
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196 static const ubyte[] DATA_1 = [0x00,0x01,0x02,0x03];
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197 static const ubyte[] DATA_2 = [0x0f,0x10,0xef,0xf0];
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198
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199 static assert( hexify_ctfe(DATA_1) == "00010203" );
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200 static assert( hexify_ctfe(DATA_2) == "0f10eff0" );
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201
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202 static assert( hexify_ctfe(DATA_1, 1) == "00 01 02 03" );
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203 static assert( hexify_ctfe(DATA_2, 1) == "0f 10 ef f0" );
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204
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205 static assert( hexify_ctfe(DATA_1, 2) == "0001 0203" );
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206 static assert( hexify_ctfe(DATA_2, 2) == "0f10 eff0" );
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207
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208 static assert( hexify_ctfe(DATA_1, 4) == "00010203" );
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209 static assert( hexify_ctfe(DATA_2, 4) == "0f10eff0" );
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210 }
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211
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212 /**
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213 * Pads a string. padl adds padding to the left, padr adds it to the right.
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214 * Params:
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215 * str = string to pad.
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216 * len = length to pad to.
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217 * padding = character to use for padding. Defaults to space.
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218 * Returns:
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219 * padded string.
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220 */
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221
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222 string padl_ctfe(string str, int len, char padding = ' ')
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223 {
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224 while( str.length < len )
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225 str = padding ~ str;
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226 return str;
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227 }
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228
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229 /// ditto
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230
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231 string padr_ctfe(string str, int len, char padding = ' ')
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232 {
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233 while( str.length < len )
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234 str ~= padding;
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235 return str;
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236 }
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237
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238 version( Unittest )
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239 {
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240 static assert( padl_ctfe("abc", 2) == "abc" );
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241 static assert( padl_ctfe("abc", 3) == "abc" );
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242 static assert( padl_ctfe("abc", 4) == " abc" );
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243 static assert( padl_ctfe("abc", 4, 'x') == "xabc" );
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244
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245 static assert( padr_ctfe("abc", 2) == "abc" );
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246 static assert( padr_ctfe("abc", 3) == "abc" );
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247 static assert( padr_ctfe("abc", 4) == "abc " );
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248 static assert( padr_ctfe("abc", 4, 'x') == "abcx" );
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249 }
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250
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251 /**
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252 * Returns the tail of a string after a given splitting character. The Rev
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253 * variant returns the tail after the last instance of the splitting
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254 * character.
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255 */
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256
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257 string tail_ctfe(string str, char split)
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258 {
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259 foreach( i,c ; str )
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260 {
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261 if( c == split )
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262 return str[i+1..$];
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263 }
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264 return str;
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265 }
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266
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267 /// ditto
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268
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269 string tailRev_ctfe(string str, char split)
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270 {
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271 foreach_reverse( i,c ; str )
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272 {
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273 if( c == split )
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274 return str[i+1..$];
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275 }
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276 return str;
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277 }
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278
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279 /**
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280 * Determines whether a character is valid in an identifier in a
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281 * non-initial position.
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282 *
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283 * Does not support the full range of valid D identifier characters.
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284 */
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285
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286 bool isIdentChar_ctfe(char c)
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287 {
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288 return ('a' <= c && c <= 'z')
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289 || ('A' <= c && c <= 'Z')
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290 || ('0' <= c && c <= '9')
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291 || (c == '_');
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292 }
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293
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294 /**
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295 * Determines whether a character is valid in an identifier in an
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296 * initial position.
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297 *
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298 * Does not support the full range of valid D identifier characters.
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299 */
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300
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301 bool isIdentStartChar_ctfe(char c)
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302 {
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303 return ('a' <= c && c <= 'z')
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304 || ('A' <= c && c <= 'Z')
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305 || (c == '_');
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306 }
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307
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308 /**
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309 * Returns a line spec suitable for mixing in. This can be used with string
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310 * mixins to ensure compile errors appear on the "correct" line in the source.
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311 */
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312
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313 string linespec_ctfe(string file, long line)
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314 {
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315 return "#line "~Integer.format_ctfe(line)~" \"" ~ file ~ "\"\n";
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316 }
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317
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