[2768] | 1 |
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| 2 | using System;
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[4068] | 3 | using System.Collections.Generic;
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[2768] | 4 | using System.Text;
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[4068] | 5 | namespace Netron.Diagramming.Core {
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[2768] | 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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[4068] | 9 | public interface IShowable : IFormattable {
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[2768] | 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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[4068] | 29 | public static class Showing {
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[2768] | 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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[4068] | 38 | public static bool Show(Object obj, StringBuilder stringbuilder, ref int rest, IFormatProvider formatProvider) {
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[2768] | 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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[4068] | 56 | public static String ShowString(IShowable showable, String format, IFormatProvider formatProvider) {
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[2768] | 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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[4068] | 68 | static int maxLength(String format) {
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[2768] | 69 | //TODO: validate format string
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| 70 | if (format == null)
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| 71 | return 80;
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[4068] | 72 | if (format.Length > 1 && format.StartsWith("L")) {
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[2768] | 73 | return int.Parse(format.Substring(1));
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[4068] | 74 | } else
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[2768] | 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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[4068] | 87 | public static bool ShowCollectionValue<T>(ICollectionBase<T> items, StringBuilder stringbuilder, ref int rest, IFormatProvider formatProvider) {
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[2768] | 88 | string startdelim = "{ ", enddelim = " }";
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| 89 | bool showIndexes = false;
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[4068] | 90 |
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[2768] | 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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[4068] | 93 | if (items is IList<T>) {
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[2768] | 94 | startdelim = "[ ";
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| 95 | enddelim = " ]";
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[4068] | 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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[2768] | 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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[4068] | 110 |
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[2768] | 111 | {
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[4068] | 112 | foreach (T x in items) {
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[2768] | 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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[4068] | 118 | else {
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[2768] | 119 | stringbuilder.Append(", ");
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| 120 | rest -= 2;
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| 121 | }
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[4068] | 122 | if (showIndexes) {
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[2768] | 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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[4068] | 130 | if (!complete) {
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[2768] | 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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[4068] | 149 | public static bool ShowDictionary<K, V>(IDictionary<K, V> dictionary, StringBuilder stringbuilder, ref int rest, IFormatProvider formatProvider) {
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[2768] | 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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[4068] | 155 | foreach (KeyValuePair<K, V> p in dictionary) {
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[2768] | 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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[4068] | 161 | else {
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[2768] | 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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[4068] | 167 | if (!complete) {
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[2768] | 168 | stringbuilder.Append("...");
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| 169 | rest -= 3;
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| 170 | }
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[4068] | 171 | stringbuilder.Append(" }");
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[2768] | 172 | return complete;
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| 173 | }
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| 174 | }
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| 175 | } |
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