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HtmlFormat.cs

#region Copyright © 2001-2003 Jean-Claude Manoli [jc@manoli.net]
/*
 * This software is provided 'as-is', without any express or implied warranty.
 * In no event will the author(s) be held liable for any damages arising from
 * the use of this software.
 * 
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 * 
 *   1. The origin of this software must not be misrepresented; you must not
 *      claim that you wrote the original software. If you use this software
 *      in a product, an acknowledgment in the product documentation would be
 *      appreciated but is not required.
 * 
 *   2. Altered source versions must be plainly marked as such, and must not
 *      be misrepresented as being the original software.
 * 
 *   3. This notice may not be removed or altered from any source distribution.
 */
#endregion

using System.Text;
using System.Text.RegularExpressions;

namespace Nop.Services.Html.CodeFormatter;

/// <summary>
/// Generates color-coded HTML 4.01 from HTML/XML/ASPX source code.
/// </summary>
/// <remarks>
/// <para>
/// This implementation assumes that code inside &lt;script&gt; blocks 
/// is JavaScript, and code inside &lt;% %&gt; blocks is C#.</para>
/// <para>
/// The default tab width is set to 2 characters in this class.</para>
/// </remarks>
public partial class HtmlFormat : SourceFormat
{
    protected readonly CSharpFormat _csf; //to format embedded C# code
    protected readonly JavaScriptFormat _jsf; //to format client-side JavaScript code
    protected readonly Regex _attributeRegex;

    /// <summary/>
    public HtmlFormat()
    {
        const string regJavaScript = @"(?<=&lt;script(?:\s.*?)?&gt;).+?(?=&lt;/script&gt;)";
        const string regComment = @"&lt;!--.*?--&gt;";
        const string regAspTag = @"&lt;%@.*?%&gt;|&lt;%|%&gt;";
        const string regAspCode = @"(?<=&lt;%).*?(?=%&gt;)";
        const string regTagDelimiter = @"(?:&lt;/?!?\??(?!%)|(?<!%)/?&gt;)+";
        const string regTagName = @"(?<=&lt;/?!?\??(?!%))[\w\.:-]+(?=.*&gt;)";
        const string regAttributes = @"(?<=&lt;(?!%)/?!?\??[\w:-]+).*?(?=(?<!%)/?&gt;)";
        const string regEntity = @"&amp;\w+;";
        const string regAttributeMatch = @"(=?"".*?""|=?'.*?')|([\w:-]+)";

        //the regex object will handle all the replacements in one pass
        var regAll = "(" + regJavaScript + ")|(" + regComment + ")|("
                     + regAspTag + ")|(" + regAspCode + ")|("
                     + regTagDelimiter + ")|(" + regTagName + ")|("
                     + regAttributes + ")|(" + regEntity + ")";

        CodeRegex = new Regex(regAll, RegexOptions.IgnoreCase | RegexOptions.Singleline);
        _attributeRegex = new Regex(regAttributeMatch, RegexOptions.Singleline);

        _csf = new CSharpFormat();
        _jsf = new JavaScriptFormat();
    }

    /// <summary>
    /// Called to evaluate the HTML fragment corresponding to each 
    /// attribute's name/value in the code.
    /// </summary>
    /// <param name="match">The <see cref="Match"/> resulting from a 
    /// single regular expression match.</param>
    /// <returns>A string containing the HTML code fragment.</returns>
    protected string AttributeMatchEval(Match match)
    {
        if (match.Groups[1].Success) //attribute value
            return "<span class=\"kwrd\">" + match + "</span>";

        if (match.Groups[2].Success) //attribute name
            return "<span class=\"attr\">" + match + "</span>";

        return match.ToString();
    }

    /// <summary>
    /// Called to evaluate the HTML fragment corresponding to each 
    /// matching token in the code.
    /// </summary>
    /// <param name="match">The <see cref="Match"/> resulting from a 
    /// single regular expression match.</param>
    /// <returns>A string containing the HTML code fragment.</returns>
    protected override string MatchEval(Match match)
    {
        if (match.Groups[1].Success) //JavaScript code
        {
            //string s = match.ToString();
            return _jsf.FormatSubCode(match.ToString());
        }

        if (match.Groups[2].Success) //comment
        {
            var reader = new StringReader(match.ToString());
            string line;
            var sb = new StringBuilder();
            while ((line = reader.ReadLine()) != null)
            {
                if (sb.Length > 0)
                {
                    sb.Append('\n');
                }

                sb.Append("<span class=\"rem\">");
                sb.Append(line);
                sb.Append("</span>");
            }

            return sb.ToString();
        }

        if (match.Groups[3].Success) //asp tag
        {
            return "<span class=\"asp\">" + match + "</span>";
        }

        if (match.Groups[4].Success) //asp C# code
        {
            return _csf.FormatSubCode(match.ToString());
        }

        if (match.Groups[5].Success) //tag delimiter
        {
            return "<span class=\"kwrd\">" + match + "</span>";
        }

        if (match.Groups[6].Success) //html tagname
        {
            return "<span class=\"html\">" + match + "</span>";
        }

        if (match.Groups[7].Success) //attributes
        {
            return _attributeRegex.Replace(match.ToString(), AttributeMatchEval);
        }

        if (match.Groups[8].Success) //entity
        {
            return "<span class=\"attr\">" + match + "</span>";
        }

        return match.ToString();
    }
}