1 |
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2 | using System;
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3 | using System.Collections.Generic;
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4 | using System.Text;
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5 | namespace Netron.Diagramming.Core {
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6 | /// <summary>
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7 | /// <i>(Describe usage of "L:300" format string.)</i>
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8 | /// </summary>
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9 | public interface IShowable : IFormattable {
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10 | //TODO: wonder if we should use TextWriters instead of StringBuilders?
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11 | /// <summary>
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12 | /// Format <code>this</code> using at most approximately <code>rest</code> chars and
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13 | /// append the result, possibly truncated, to stringbuilder.
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14 | /// Subtract the actual number of used chars from <code>rest</code>.
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15 | /// </summary>
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16 | /// <param name="stringbuilder"></param>
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17 | /// <param name="rest"></param>
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18 | /// <param name="formatProvider"></param>
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19 | /// <returns>True if the appended formatted string was complete (not truncated).</returns>
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20 | bool Show(StringBuilder stringbuilder, ref int rest, IFormatProvider formatProvider);
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21 | }
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22 | // ------------------------------------------------------------
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23 |
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24 | // Static helper methods for Showing collections
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25 |
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26 | /// <summary>
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27 | ///
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28 | /// </summary>
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29 | public static class Showing {
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30 | /// <summary>
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31 | /// Show <code>Object obj</code> by appending it to <code>stringbuilder</code>
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32 | /// </summary>
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33 | /// <param name="obj"></param>
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34 | /// <param name="stringbuilder"></param>
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35 | /// <param name="rest"></param>
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36 | /// <param name="formatProvider"></param>
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37 | /// <returns>True if <code>obj</code> was shown completely.</returns>
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38 | public static bool Show(Object obj, StringBuilder stringbuilder, ref int rest, IFormatProvider formatProvider) {
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39 | if (rest <= 0)
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40 | return false;
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41 | else if (obj is IShowable)
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42 | return ((IShowable)obj).Show(stringbuilder, ref rest, formatProvider);
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43 | int oldLength = stringbuilder.Length;
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44 | stringbuilder.AppendFormat(formatProvider, "{0}", obj);
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45 | rest -= (stringbuilder.Length - oldLength);
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46 | return true;
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47 | }
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48 |
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49 | /// <summary>
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50 | ///
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51 | /// </summary>
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52 | /// <param name="showable"></param>
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53 | /// <param name="format"></param>
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54 | /// <param name="formatProvider"></param>
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55 | /// <returns></returns>
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56 | public static String ShowString(IShowable showable, String format, IFormatProvider formatProvider) {
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57 | int rest = maxLength(format);
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58 | StringBuilder sb = new StringBuilder();
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59 | showable.Show(sb, ref rest, formatProvider);
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60 | return sb.ToString();
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61 | }
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62 |
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63 | /// <summary>
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64 | ///
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65 | /// </summary>
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66 | /// <param name="format"></param>
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67 | /// <returns></returns>
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68 | static int maxLength(String format) {
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69 | //TODO: validate format string
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70 | if (format == null)
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71 | return 80;
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72 | if (format.Length > 1 && format.StartsWith("L")) {
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73 | return int.Parse(format.Substring(1));
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74 | } else
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75 | return int.MaxValue;
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76 | }
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77 |
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78 | /// <summary>
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79 | ///
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80 | /// </summary>
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81 | /// <typeparam name="T"></typeparam>
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82 | /// <param name="items"></param>
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83 | /// <param name="stringbuilder"></param>
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84 | /// <param name="rest"></param>
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85 | /// <param name="formatProvider"></param>
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86 | /// <returns>True if collection was shown completely</returns>
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87 | public static bool ShowCollectionValue<T>(ICollectionBase<T> items, StringBuilder stringbuilder, ref int rest, IFormatProvider formatProvider) {
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88 | string startdelim = "{ ", enddelim = " }";
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89 | bool showIndexes = false;
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90 |
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91 | //TODO: do not test here at run time, but select code at compile time
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92 | // perhaps by delivering the print type to this metod
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93 | if (items is IList<T>) {
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94 | startdelim = "[ ";
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95 | enddelim = " ]";
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96 |
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97 | } else if (items is ICollection<T>) {
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98 |
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99 | startdelim = "{{ ";
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100 | enddelim = " }}";
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101 |
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102 | }
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103 |
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104 | stringbuilder.Append(startdelim);
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105 | rest -= 2 * startdelim.Length;
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106 | bool first = true;
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107 | bool complete = true;
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108 | int index = 0;
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109 |
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110 |
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111 | {
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112 | foreach (T x in items) {
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113 | complete = false;
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114 | if (rest <= 0)
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115 | break;
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116 | if (first)
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117 | first = false;
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118 | else {
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119 | stringbuilder.Append(", ");
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120 | rest -= 2;
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121 | }
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122 | if (showIndexes) {
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123 | string indexString = string.Format("{0}:", index++);
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124 | stringbuilder.Append(indexString);
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125 | rest -= indexString.Length;
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126 | }
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127 | complete = Showing.Show(x, stringbuilder, ref rest, formatProvider);
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128 | }
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129 | }
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130 | if (!complete) {
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131 | stringbuilder.Append("...");
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132 | rest -= 3;
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133 | }
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134 | stringbuilder.Append(enddelim);
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135 | return complete;
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136 | }
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137 |
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138 | /// <summary>
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139 | ///
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140 | /// </summary>
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141 | /// <typeparam name="K"></typeparam>
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142 | /// <typeparam name="V"></typeparam>
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143 | ///
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144 | /// <param name="dictionary"></param>
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145 | /// <param name="stringbuilder"></param>
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146 | /// <param name="formatProvider"></param>
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147 | /// <param name="rest"></param>
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148 | /// <returns></returns>
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149 | public static bool ShowDictionary<K, V>(IDictionary<K, V> dictionary, StringBuilder stringbuilder, ref int rest, IFormatProvider formatProvider) {
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150 | stringbuilder.Append("{ ");
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151 | rest -= 4; // Account for "( " and " )"
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152 | bool first = true;
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153 | bool complete = true;
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154 |
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155 | foreach (KeyValuePair<K, V> p in dictionary) {
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156 | complete = false;
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157 | if (rest <= 0)
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158 | break;
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159 | if (first)
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160 | first = false;
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161 | else {
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162 | stringbuilder.Append(", ");
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163 | rest -= 2;
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164 | }
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165 | complete = Showing.Show(p, stringbuilder, ref rest, formatProvider);
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166 | }
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167 | if (!complete) {
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168 | stringbuilder.Append("...");
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169 | rest -= 3;
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170 | }
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171 | stringbuilder.Append(" }");
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172 | return complete;
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173 | }
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174 | }
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175 | } |
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