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annotate dynamin/core/format.d @ 109:7678554e75de

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Add dynamin.core.format with parseFormatString().
author Jordan Miner <jminer7@gmail.com>
date Sat, 19 Jan 2013 20:50:41 -0600
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1
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2 /*
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3 * Copyright Jordan Miner
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4 *
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5 * Distributed under the Boost Software License, Version 1.0.
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6 * (See accompanying file BOOST_LICENSE.txt or copy at
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7 * http://www.boost.org/LICENSE_1_0.txt)
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8 *
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9 */
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10
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11 module dynamin.core.format;
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12
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13 import dynamin.core.global;
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14 import dynamin.core.string;
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15 import dynamin.core.test;
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16
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17 private:
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18
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19 cstring parseFormatParam(cstring specifier, ref int paramIndex) {
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20 // specifier is something like "1:x" or ":d"
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21 int i;
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22 for(i = 0; i < specifier.length && specifier[i] != ':'; ++i) {
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23 }
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24 if(i > 0) {
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25 try {
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26 paramIndex = to!int(specifier[0..i]);
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27 } catch(Exception ex) {
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28 throw new Exception("Invalid parameter index.");
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29 }
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30 }
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31 return i >= specifier.length ? "" : specifier[i+1..$];
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32 }
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33
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34 /**
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35 * Parses `formatStr`, passing each part to `write` or `writeParam` as it is encountered.
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36 * For example:
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37 *
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38 * parseFormatString("I am {0:x} years old!", writeParam, write);
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39 * // will result in:
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40 * write("I am ");
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41 * writeParam(0, "x");
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42 * write(" years old!");
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43 *
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44 */
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45 public void parseFormatString( cstring formatStr,
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46 void delegate(int param, cstring format) writeParam,
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47 void delegate(scope cstring str) write) {
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48
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49 int paramIndex = 0; // param to write next, if not specified
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50 cstring paramFormat;
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51
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52 uword start = 0;
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53
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54 for(int i = 0; i < formatStr.length; ++i) {
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55 if(formatStr[i] == '{') {
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56 write(formatStr[start..i]);
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57 start = i + 1;
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58
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59 if(i + 1 >= formatStr.length)
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60 throw new Exception("Unterminated format specifier.");
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61 ++i;
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62
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63 if(formatStr[i] == '{') { // escaped open brace
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64 // start already is the index of the second open brace
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65 } else { // format specifier
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66 while(formatStr[i] != '}') {
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67 if(formatStr[i] == '{')
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68 throw new Exception("Open brace in format specifier.");
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69 if(++i >= formatStr.length)
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70 throw new Exception("Unterminated format specifier.");
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71 }
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72 paramFormat = parseFormatParam(formatStr[start..i], paramIndex);
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73 start = i + 1;
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74 writeParam(paramIndex, paramFormat);
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75 ++paramIndex;
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76 }
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77 } else if(formatStr[i] == '}') {
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78 write(formatStr[start..i]);
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79 start = i + 1;
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80
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81 if(i + 1 >= formatStr.length || formatStr[i + 1] != '}')
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82 throw new Exception("Unescaped close brace.");
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83 ++i; // escaped close brace
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84 }
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85 }
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86 if(start < formatStr.length)
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87 write(formatStr[start..$]);
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88 }
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89
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90 unittest {
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91 struct Call {
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92 int index;
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93 string str;
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94 }
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95 Call[] calls;
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96 int callIndex;
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97 void paramCallback(int param, cstring format) {
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98 assertEqual(param, calls[callIndex].index); // crash if out of bounds
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99 assertEqual(format, calls[callIndex].str);
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100 ++callIndex;
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101 };
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102 void strCallback(scope cstring str) {
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103 assertEqual(str, calls[callIndex].str); // crash if out of bounds
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104 ++callIndex;
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105 };
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106
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107 calls = [
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108 Call(-1, "one"),
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109 Call(0, ""),
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110 Call(-1, "two"),
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111 Call(1, ""),
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112 Call(-1, "three")
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113 ];
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114 callIndex = 0;
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115 parseFormatString("one{0}two{1}three", &paramCallback, &strCallback);
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116 assertEqual(callIndex, calls.length);
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117
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118 calls = [
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119 Call(-1, "one"),
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120 Call(0, "abc12"),
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121 Call(-1, "two"),
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122 Call(1, "yyyy-mm-dd"),
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123 Call(-1, "three")
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124 ];
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125 callIndex = 0;
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126 parseFormatString("one{0:abc12}two{1:yyyy-mm-dd}three", &paramCallback, &strCallback);
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127 assertEqual(callIndex, calls.length);
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128
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129 calls = [
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130 Call(-1, "one"),
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131 Call(0, "~!@#$%^&*()_+-=[]\\:\"<>?;',./"),
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132 Call(-1, "two"),
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133 ];
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134 callIndex = 0;
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135 parseFormatString("one{0:~!@#$%^&*()_+-=[]\\:\"<>?;',./}two", &paramCallback, &strCallback);
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136 assertEqual(callIndex, calls.length);
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137
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138 calls = [
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139 Call(-1, "one"),
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140 Call(0, ""),
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141 Call(-1, "two"),
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142 Call(1, ""),
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143 Call(-1, "three"),
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144 Call(2, ""),
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145 ];
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146 callIndex = 0;
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147 parseFormatString("one{}two{}three{}", &paramCallback, &strCallback);
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148 assertEqual(callIndex, calls.length);
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149
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150 calls = [
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151 Call(-1, "one"),
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152 Call(4, ""),
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153 Call(-1, "two"),
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154 Call(5, ""),
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155 Call(-1, "three"),
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156 Call(2, ""),
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157 Call(-1, "four"),
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158 Call(3, "x"),
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159 ];
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160 callIndex = 0;
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161 parseFormatString("one{4}two{}three{2}four{:x}", &paramCallback, &strCallback);
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162 assertEqual(callIndex, calls.length);
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163
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164 string testStr;
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165 parseFormatString( "on{{e}}{2}}}two{{{}}}",
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166 delegate (i, f) { testStr ~= "P"; },
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167 delegate (scope str) { testStr ~= str; });
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168 assertEqual(testStr, "on{e}P}two{P}");
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169
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170 assertThrows!Exception(parseFormatString( "test{",
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171 delegate (i, f) { },
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172 delegate (scope str) { }));
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173 assertThrows!Exception(parseFormatString( "test{0",
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174 delegate (i, f) { },
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175 delegate (scope str) { }));
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176 assertThrows!Exception(parseFormatString( "test{0{}",
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177 delegate (i, f) { },
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178 delegate (scope str) { }));
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179 assertThrows!Exception(parseFormatString( "test}ing",
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180 delegate (i, f) { },
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181 delegate (scope str) { }));
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182 assertThrows!Exception(parseFormatString( "test{0x12}ing",
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183 delegate (i, f) { },
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184 delegate (scope str) { }));
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185 }
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186