My old website had an online syntax highlighter tool. I’ve since migrated to WordPress and I’m no longer able to host this tool. I’m posting the source code used instead – there are probably more sophisticated options available, but hopefully someone will find this useful!
Use the FormatCode method to generate a formatted HTML version of your code and include the CSS for styling. Supports VBScript, BAT, KiXtart, PowerShell, HTA & TSQL.
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Imports Microsoft.VisualBasic Imports System.Xml Public Class CodeFormatter Private xVBScript As XmlDocument Private xTSQL As XmlDocument Public Enum enumCodeType VBScript = 1 BAT = 2 KiXtart = 3 PowerShell = 4 HTA = 5 General = 0 TSQL = 6 End Enum Public Function FormatCode(ByVal code As String, ByVal codeType As enumCodeType, ByVal useAlt As Boolean, ByVal lineNos As Boolean) As String ' code = code.Replace("<", "<") ' code = code.Replace(">", ">") Dim formattedCode As String Select Case codeType Case enumCodeType.VBScript formattedCode = formatVBScript(code, useAlt, lineNos) Case enumCodeType.BAT formattedCode = formatBatchFile(code, useAlt, lineNos) Case enumCodeType.PowerShell formattedCode = formatPowerShell(code, useAlt, lineNos) Case enumCodeType.TSQL formattedCode = formatTSQL(code, useAlt, lineNos) Case enumCodeType.HTA formattedCode = formatHTA(code, useAlt, lineNos) Case Else formattedCode = formatOther(code, useAlt, lineNos) End Select If lineNos Then Return "<div class=""CodeFormatter""><ol>" & formattedCode & "</ol></div>" Else Return "<div class=""CodeFormatter""><pre>" & formattedCode & "</pre></div>" End If End Function #Region "TSQL" Private Function formatTSQL(ByVal code As String, ByVal useAlt As Boolean, ByVal lineNos As Boolean, Optional ByVal alt As Boolean = False) As String Dim sb As New System.Text.StringBuilder Dim sbBuffer As New System.Text.StringBuilder Dim isComment As Boolean, isCommentBlock As Boolean Dim commentBlockCount As Int32 = 0 Dim isDoubleQuote As Boolean Dim isQuote As Boolean Dim lastChar As String = "" Dim nextChar As String If lineNos Then If useAlt = True And alt Then sb.Append("<li class=""alt"">") Else sb.Append("<li>") End If alt = Not alt End If Dim rdr As New IO.StringReader(code) While rdr.Peek <> -1 Dim thisChar As String = Convert.ToChar(rdr.Read) If rdr.Peek <> -1 Then nextChar = Convert.ToChar(rdr.Peek) Else nextChar = "" End If If thisChar = Chr(13) Or thisChar = Chr(10) Then If isCommentBlock Then sb.Append(formatComment(sbBuffer.ToString)) ElseIf isQuote Then sb.Append(formatQuoted2(sbBuffer.ToString)) ElseIf isDoubleQuote Then sb.Append(sbBuffer.ToString) Else sb.Append(formatTSQLKeyword(sbBuffer.ToString)) End If If lineNos = True Then If useAlt = True And alt = True Then sb.Append("</li><li class=""alt"">") Else sb.Append("</li><li>") End If Else sb.AppendLine() End If sbBuffer = New System.Text.StringBuilder If nextChar = Chr(10) Then rdr.Read() End If alt = Not alt Else sbBuffer.Append(thisChar) End If If isComment Then If nextChar = Chr(13) Or nextChar = Chr(10) Then sb.Append(formatComment(sbBuffer.ToString)) sbBuffer = New System.Text.StringBuilder isComment = False End If ElseIf isCommentBlock Then If lastChar = "*" AndAlso thisChar = "/" Then commentBlockCount -= 1 End If If thisChar = "/" AndAlso nextChar = "*" Then commentBlockCount += 1 End If If commentBlockCount = 0 Then sb.Append(formatComment(sbBuffer.ToString)) sbBuffer = New System.Text.StringBuilder isCommentBlock = False End If ElseIf isQuote Then If thisChar = "'" Then sb.Append(formatQuoted2(sbBuffer.ToString)) sbBuffer = New System.Text.StringBuilder isQuote = False End If ElseIf isDoubleQuote Then If thisChar = """" Then sb.Append(HttpUtility.HtmlEncode(sbBuffer.ToString)) sbBuffer = New System.Text.StringBuilder isDoubleQuote = False End If Else If thisChar = "'" Then isQuote = True ElseIf thisChar = """" Then sb.Append(HttpUtility.HtmlEncode(sbBuffer.ToString)) sbBuffer = New System.Text.StringBuilder isDoubleQuote = True ElseIf thisChar = "/" And nextChar = "*" Then isCommentBlock = True commentBlockCount = 1 ElseIf thisChar = "-" And nextChar = "-" Then isComment = True ElseIf Char.IsLetterOrDigit(thisChar) = False And thisChar <> "@" And thisChar <> "_" And thisChar <> "#" Then sb.Append(HttpUtility.HtmlEncode(sbBuffer.ToString)) sbBuffer = New System.Text.StringBuilder Else If Char.IsLetterOrDigit(nextChar) = False And nextChar <> "_" And nextChar <> "@" Then sb.Append(formatTSQLKeyword(sbBuffer.ToString)) sbBuffer = New System.Text.StringBuilder End If End If End If lastChar = thisChar End While If lineNos Then sb.Append("</li>") End If sb.Append(HttpUtility.HtmlEncode(sbBuffer.ToString)) Return sb.ToString End Function Private Function formatTSQLKeyword(ByVal word As String) As String If xTSQL Is Nothing Then xTSQL = New XmlDocument xTSQL.Load(System.Web.HttpContext.Current.Request.PhysicalApplicationPath & "App_Data\tsql.xml") End If If word.IndexOf("""") > 0 Then Return HttpUtility.HtmlEncode(word) End If Dim n As XmlNode n = xTSQL.SelectSingleNode("/tsql/keyword[@value=""" & word.ToUpper & """]") If n Is Nothing Then Return word Else Return "<span class=""" & n.Attributes("class").Value & """>" & HttpUtility.HtmlEncode(word) & "</span>" End If End Function #End Region Private Function formatHTA(ByVal code As String, ByVal useAlt As Boolean, ByVal lineNos As Boolean) As String Dim sb As New System.Text.StringBuilder Dim startIdx As Int32 = 0 Dim alt As Boolean = False Do Dim iStartTag As Int32, iEndTag As Int32 Dim iEndElement As Int32 Dim scriptTag As String iStartTag = code.IndexOf("<script ", startIdx) If iStartTag >= 0 Then iEndTag = code.IndexOf(">", iStartTag) If iEndTag >= 0 Then iEndElement = code.IndexOf("</script>", iEndTag) Else Exit Do End If Else Exit Do End If scriptTag = code.Substring(iStartTag, iEndTag - iStartTag + 1) If scriptTag.ToLower.IndexOf("vbscript") >= 0 Then sb.Append(formatOther(code.Substring(0, iEndTag + 1), useAlt, lineNos, alt)) sb.Append(formatVBScript(code.Substring(iEndTag + 1, iEndElement - iEndTag - 1), useAlt, lineNos, alt)) code = code.Substring(iEndElement) Else startIdx = iEndElement End If Loop sb.Append(formatOther(code, useAlt, lineNos, alt)) Return sb.ToString End Function Private Function formatPowerShell(ByVal code As String, ByVal useAlt As Boolean, ByVal lineNos As Boolean) As String Dim sb As New Text.StringBuilder Dim rdr As New IO.StringReader(code) Dim i As Int32 = 0 While rdr.Peek <> -1 Dim line As String = rdr.ReadLine If lineNos = True Then If i Mod 2 = 0 And useAlt = True Then sb.Append("<li class=""alt"">") Else sb.Append("<li>") End If End If If line.StartsWith("#") Then sb.Append(formatComment(line)) Else If line.IndexOf(" #") > 0 Then sb.Append(HttpUtility.HtmlEncode(line.Substring(0, line.IndexOf(" #")))) sb.Append(formatComment(line.Substring(line.IndexOf(" #"), Len(line) - line.IndexOf(" #")))) Else sb.Append(HttpUtility.HtmlEncode(line)) End If End If If lineNos Then sb.Append("</li>") Else sb.AppendLine() End If i += 1 End While Return sb.ToString ' Return "<div class=""code""><pre>" & sb.ToString & "</pre></div>" End Function Private Function formatBatchFile(ByVal code As String, ByVal useAlt As Boolean, ByVal lineNos As Boolean) As String Dim sb As New Text.StringBuilder Dim rdr As New IO.StringReader(code) Dim i As Int32 = 0 While rdr.Peek <> -1 Dim line As String = rdr.ReadLine If lineNos = True Then If i Mod 2 = 0 And useAlt = True Then sb.Append("<li class=""alt"">") Else sb.Append("<li>") End If End If If line.ToLower.StartsWith("rem ") Or line.ToLower = "rem" Or line.StartsWith("::") Then sb.Append(formatComment(line)) Else sb.Append(HttpUtility.HtmlEncode(line)) End If If lineNos Then sb.Append("</li>") Else sb.AppendLine() End If i += 1 End While Return sb.ToString End Function Private Function formatOther(ByVal code As String, ByVal useAlt As Boolean, ByVal lineNos As Boolean, Optional ByRef alt As Boolean = False) As String Dim sb As New Text.StringBuilder Dim rdr As New IO.StringReader(code) While rdr.Peek <> -1 Dim line As String = rdr.ReadLine If lineNos = True Then If alt And useAlt = True Then sb.Append("<li class=""alt"">") Else sb.Append("<li>") End If End If sb.Append(HttpUtility.HtmlEncode(line)) If lineNos Then sb.Append("</li>") Else sb.AppendLine() End If alt = Not alt End While Return sb.ToString End Function Private Function formatVBScript(ByVal code As String, ByVal useAlt As Boolean, ByVal lineNos As Boolean, Optional ByRef alt As Boolean = False) As String ' Dim sb As New System.Text.StringBuilder Dim sbFormatted As New System.Text.StringBuilder Dim thisChar As Char, nextChar As Char, word As String = "" 'Dim formattedCode As String = "" Dim openDoubleQuote As Boolean, beginComment As Boolean Dim rdr As New System.IO.StringReader(code) If lineNos Then If useAlt And alt Then sbFormatted.Append("<li class=""alt"">") Else sbFormatted.Append("<li>") End If alt = Not alt End If While rdr.Peek <> -1 thisChar = Convert.ToChar(rdr.Read) If rdr.Peek <> -1 Then nextChar = Convert.ToChar(rdr.Peek) Else nextChar = "" End If If thisChar = """" And beginComment = False Then 'Quoted string not inside comment If openDoubleQuote Then 'End of Quoted string sbFormatted.Append(formatQuoted(word & thisChar)) word = "" Else 'Start of quoted string sbFormatted.Append(HttpUtility.HtmlEncode(word)) word = thisChar End If openDoubleQuote = Not openDoubleQuote ElseIf thisChar = "'" And openDoubleQuote = False And beginComment = False Then ' Start of comment sbFormatted.Append(HttpUtility.HtmlEncode(word)) beginComment = True word = thisChar ' ElseIf thisChar = Chr(13) And beginComment = True Then 'End of comment (new line) ' sbFormatted.Append(formatComment(word) & thisChar) ' word = "" ' beginComment = False Else If thisChar = Chr(13) Or thisChar = Chr(10) Then If beginComment Then sbFormatted.Append(formatComment(word)) beginComment = False ElseIf openDoubleQuote Then sbFormatted.Append(formatQuoted(word)) Else If isKeyWord(word) Then sbFormatted.Append(formatKeyWord(word)) ElseIf word.ToLower = "rem" Then sbFormatted.Append(formatComment(word)) Else sbFormatted.Append(HttpUtility.HtmlEncode(word)) End If End If If lineNos = True Then If alt And useAlt = True Then sbFormatted.Append("</li><li class=""alt"">") Else sbFormatted.Append("</li><li>") End If Else sbFormatted.AppendLine() '("<br/>") End If word = "" If nextChar = Chr(10) Or nextChar = Chr(13) Then rdr.Read() End If alt = Not alt ElseIf (Char.IsWhiteSpace(thisChar) Or Char.IsPunctuation(thisChar)) _ And openDoubleQuote = False And beginComment = False And thisChar <> "_" Then 'White space or punctuation ends the current word unless inside quotation or comment If word.ToLower = "rem" And thisChar = Chr(13) Then 'rem on line by itself word = formatComment(word) & thisChar sbFormatted.Append(word) word = "" ElseIf word.ToLower = "rem" Then 'start of comment word &= thisChar beginComment = True Else If isKeyWord(word) Then word = formatKeyWord(word) Else word = HttpUtility.HtmlEncode(word) End If sbFormatted.Append(word & HttpUtility.HtmlEncode(thisChar)) word = "" End If Else 'build word char by char word &= thisChar End If End If End While ' formatting of last word If beginComment = True Then sbFormatted.Append(formatComment(word)) ElseIf isKeyWord(word) Then sbFormatted.Append(formatKeyWord(word)) Else sbFormatted.Append(HttpUtility.HtmlEncode(word)) End If If lineNos Then sbFormatted.Append("</li>") End If Return sbFormatted.ToString End Function Private Function formatKeyWord(ByVal code As String) As String Return "<span class=""CF_KW"">" & HttpUtility.HtmlEncode(code) & "</span>" End Function Private Function formatComment(ByVal code As String) As String Return "<span class=""CF_C"">" & HttpUtility.HtmlEncode(code) & "</span>" End Function Private Function formatQuoted(ByVal code As String) As String Return "<span class=""CF_Q"">" & HttpUtility.HtmlEncode(code) & "</span>" End Function Private Function formatQuoted2(ByVal code As String) As String Return "<span class=""CF_Q2"">" & HttpUtility.HtmlEncode(code) & "</span>" End Function Function isKeyWord(ByVal word As String) As Boolean word = word.ToLower If xVBScript Is Nothing Then xVBScript = New XmlDocument xVBScript.Load(System.Web.HttpContext.Current.Request.PhysicalApplicationPath & "App_Data\vbscript.xml") End If Dim n As XmlNode n = xVBScript.SelectSingleNode("/vbscript//add[@key=""" & word & """]") If n Is Nothing Then Return False Else Return True End If End Function End Class |
CSS:
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/* All code formatting takes place inside a div with this class */ .CodeFormatter{ /* font-family:Arial Narrow;*/ font-family: "Courier New", Courier, mono, serif; font-size:medium; font-size: 12px; background-color:#F6F6F6; width: 99%; overflow: auto; padding-bottom:0px; padding-top:0px; padding-left: 5px; padding-right: 5px; border-width:1px; border-style:dotted; white-space:pre; color:black; } .CodeFormatter ol{ list-style: decimal; /* for ie */ background-color: #F8F8F8; margin: 0px 0px 1px 40px !important; /* 1px bottom margin seems to fix occasional Firefox scrolling */ padding: 0px; } .CodeFormatter ol li, .CodeFormatter .columns div{ list-style: decimal-leading-zero; /* better look for others, override cascade from OL */ list-style-position: outside !important; border-left: 3px solid #6CE26C; background-color: White; color: Black; padding: 0 3px 0 10px !important; margin: 0 !important; line-height: 14px; } .CodeFormatter ol li.alt { background-color: #f6f6f6; color: Black; } .CodeFormatter .columns{ background-color: #F8F8F8; color: gray; overflow: hidden; width: 100%; } /* For comments */ .CodeFormatter .CF_C { color:Green; } /* For Quoted Text (Maroon) */ .CodeFormatter .CF_Q { color:Maroon; } /* For Quoted Text (Red) */ .CodeFormatter .CF_Q2 { color:Red; } /* For Keywords (Blue) */ .CodeFormatter .CF_KW { color:Blue; text-transform:uppercase; } /* For Keywords (Magenta) e.g. T-SQL System Function*/ .CodeFormatter .CF_KW2 { color:#FF00FF; text-transform:uppercase; } /* For Keywords (Gray) e.g. TSQL Operator */ .CodeFormatter .CF_KW3 { color:#505050; text-transform:uppercase; } /* For Keywords (Green) e.g. TSQL System table/view */ .CodeFormatter .CF_KW4{ color:Green; } /* For Keyords (Maroon) e.g. TSQL System SP */ .CodeFormatter .CF_KW5 { color:#800000; } |