218 lines
8.0 KiB
C#
218 lines
8.0 KiB
C#
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// ****************************************************************
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// Copyright 2007, Charlie Poole
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// This is free software licensed under the NUnit license. You may
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// obtain a copy of the license at http://nunit.org/?p=license&r=2.4
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// ****************************************************************
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using System;
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using System.Text;
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using System.Collections;
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namespace NUnit.Framework
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{
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/// <summary>
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/// Static methods used in creating messages
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/// </summary>
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public class MsgUtils
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{
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/// <summary>
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/// Static string used when strings are clipped
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/// </summary>
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public static readonly string ELLIPSIS = "...";
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/// <summary>
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/// Returns the representation of a type as used in NUnitLite.
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/// This is the same as Type.ToString() except for arrays,
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/// which are displayed with their declared sizes.
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/// </summary>
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/// <param name="obj"></param>
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/// <returns></returns>
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public static string GetTypeRepresentation(object obj)
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{
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Array array = obj as Array;
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if ( array == null )
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return string.Format( "<{0}>", obj.GetType() );
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StringBuilder sb = new StringBuilder();
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Type elementType = array.GetType();
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int nest = 0;
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while (elementType.IsArray)
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{
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elementType = elementType.GetElementType();
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++nest;
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}
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sb.Append(elementType.ToString());
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sb.Append('[');
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for (int r = 0; r < array.Rank; r++)
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{
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if (r > 0) sb.Append(',');
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sb.Append(array.GetLength(r));
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}
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sb.Append(']');
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while (--nest > 0)
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sb.Append("[]");
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return string.Format( "<{0}>", sb.ToString() );
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}
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/// <summary>
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/// Converts any control characters in a string
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/// to their escaped representation.
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/// </summary>
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/// <param name="s">The string to be converted</param>
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/// <returns>The converted string</returns>
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public static string ConvertWhitespace(string s)
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{
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if( s != null )
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{
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s = s.Replace( "\\", "\\\\" );
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s = s.Replace( "\r", "\\r" );
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s = s.Replace( "\n", "\\n" );
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s = s.Replace( "\t", "\\t" );
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}
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return s;
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}
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/// <summary>
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/// Return the a string representation for a set of indices into an array
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/// </summary>
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/// <param name="indices">Array of indices for which a string is needed</param>
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public static string GetArrayIndicesAsString(int[] indices)
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{
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StringBuilder sb = new StringBuilder();
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sb.Append('[');
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for (int r = 0; r < indices.Length; r++)
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{
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if (r > 0) sb.Append(',');
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sb.Append(indices[r].ToString());
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}
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sb.Append(']');
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return sb.ToString();
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}
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/// <summary>
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/// Get an array of indices representing the point in a collection or
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/// array corresponding to a single int index into the collection.
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/// </summary>
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/// <param name="collection">The collection to which the indices apply</param>
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/// <param name="index">Index in the collection</param>
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/// <returns>Array of indices</returns>
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public static int[] GetArrayIndicesFromCollectionIndex(ICollection collection, int index)
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{
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Array array = collection as Array;
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if ( array == null || array.Rank == 1)
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return new int[] { index };
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int[] result = new int[array.Rank];
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for (int r = array.Rank; --r > 0; )
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{
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int l = array.GetLength(r);
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result[r] = index % l;
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index /= l;
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}
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result[0] = index;
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return result;
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}
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/// <summary>
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/// Clip a string to a given length, starting at a particular offset, returning the clipped
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/// string with ellipses representing the removed parts
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/// </summary>
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/// <param name="s">The string to be clipped</param>
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/// <param name="maxStringLength">The maximum permitted length of the result string</param>
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/// <param name="clipStart">The point at which to start clipping</param>
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/// <returns>The clipped string</returns>
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public static string ClipString(string s, int maxStringLength, int clipStart)
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{
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int clipLength = maxStringLength;
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StringBuilder sb = new StringBuilder();
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if (clipStart > 0)
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{
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clipLength -= ELLIPSIS.Length;
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sb.Append( ELLIPSIS );
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}
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if (s.Length - clipStart > clipLength)
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{
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clipLength -= ELLIPSIS.Length;
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sb.Append( s.Substring( clipStart, clipLength ));
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sb.Append(ELLIPSIS);
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}
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else if (clipStart > 0)
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sb.Append( s.Substring(clipStart));
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else
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sb.Append( s );
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return sb.ToString();
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}
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/// <summary>
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/// Clip the expected and actual strings in a coordinated fashion,
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/// so that they may be displayed together.
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/// </summary>
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/// <param name="expected"></param>
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/// <param name="actual"></param>
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/// <param name="maxDisplayLength"></param>
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/// <param name="mismatch"></param>
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public static void ClipExpectedAndActual(ref string expected, ref string actual, int maxDisplayLength, int mismatch)
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{
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// Case 1: Both strings fit on line
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int maxStringLength = Math.Max(expected.Length, actual.Length);
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if (maxStringLength <= maxDisplayLength)
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return;
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// Case 2: Assume that the tail of each string fits on line
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int clipLength = maxDisplayLength - ELLIPSIS.Length;
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int tailLength = clipLength - mismatch;
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int clipStart = maxStringLength - clipLength;
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// Case 3: If it doesn't, center the mismatch position
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if ( clipStart > mismatch )
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clipStart = Math.Max( 0, mismatch - clipLength / 2 );
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expected = ClipString(expected, maxDisplayLength, clipStart);
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actual = ClipString(actual, maxDisplayLength, clipStart);
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}
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/// <summary>
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/// Shows the position two strings start to differ. Comparison
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/// starts at the start index.
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/// </summary>
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/// <param name="expected">The expected string</param>
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/// <param name="actual">The actual string</param>
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/// <param name="istart">The index in the strings at which comparison should start</param>
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/// <param name="ignoreCase">Boolean indicating whether case should be ignored</param>
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/// <returns>-1 if no mismatch found, or the index where mismatch found</returns>
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static public int FindMismatchPosition(string expected, string actual, int istart, bool ignoreCase)
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{
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int length = Math.Min(expected.Length, actual.Length);
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string s1 = ignoreCase ? expected.ToLower() : expected;
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string s2 = ignoreCase ? actual.ToLower() : actual;
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for (int i = istart; i < length; i++)
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{
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if (s1[i] != s2[i])
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return i;
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}
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//
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// Strings have same content up to the length of the shorter string.
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// Mismatch occurs because string lengths are different, so show
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// that they start differing where the shortest string ends
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//
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if (expected.Length != actual.Length)
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return length;
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//
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// Same strings : We shouldn't get here
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//
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return -1;
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}
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}
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}
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