/src/NUnit/UiException/CodeFormatters/PlainTextCodeFormatter.cs

// ****************************************************************

// This is free software licensed under the NUnit license. You may

// obtain a copy of the license at http://nunit.org

// ****************************************************************



using System;

using System.Collections.Generic;

using System.Text;

using NUnit.UiException.CodeFormatters;



namespace NUnit.UiException.CodeFormatters

{

    /// <summary>

    /// Create a default FormattedCode for any string value.

    /// This should be used as a last resort when there is not ICodeFormatter

    /// that fit source code for an ErrorItem.

    /// </summary>

    public class PlainTextCodeFormatter :

        ICodeFormatter

    {

        #region ICodeFormatter Membres



        /// <summary>

        /// Returns "Plain text"

        /// </summary>

        public string Language

        {

            get { return ("Plain text"); }

        }



        public FormattedCode Format(string sourceCode)

        {

            DefaultTextManager text;

            byte[] byteArray;

            int[] strArray;

            int[] lineArray;

            int index;

            int posLineStart;

            int posChar;



            UiExceptionHelper.CheckNotNull(sourceCode, "sourceCode");



            sourceCode = PreProcess(sourceCode);



            text = new DefaultTextManager();

            text.Text = sourceCode;



            strArray = new int[text.LineCount];

            lineArray = new int[text.LineCount];



            index = 0;

            posLineStart = 0;

            posChar = 0;



            foreach (char c in sourceCode)

            {

                if (c == '\n')

                {

                    strArray[index] = posLineStart;

                    lineArray[index] = index;

                    posLineStart = posChar + 1;

                    index++;

                }



                posChar++;

            }



            if (index <= text.LineCount - 1)

            {

                strArray[index] = posLineStart;

                lineArray[index] = index;

            }



            byteArray = new byte[text.LineCount];



            return (new FormattedCode(sourceCode, strArray, byteArray, lineArray));

        }



        #endregion



        /// <summary>

        /// Prepare input text for the parsing stage.

        /// </summary>

        /// <param name="text">The text to be pre-processed.</param>

        /// <returns>A string ready to be parsed.</returns>

        public string PreProcess(string text)

        {

            if (text == null)

                return (null);



            // this replace tabulation by space sequences. The reason is

            // that the technique used to measure strings at rendering time

            // fail to measure '\t' correctly and lines of text containing those

            // characters are badly aligned.

            //  The simplest thing to fix that is to remove tabs altogether.



            return (text.Replace("\t", "    "));

        }

    }

}