Is there a lang-vb or lang-basic option for prettify.js from Google?

Answer 1

So your asking us if we know more than the actual README issued with it, even though there is a clear "supported file extensions"??

PS: I like your bio :D Aren't we all man :)

Answer 2

Awesome ;)

From what I can see, there is no real alternative due to the fundamental way that prettify deals with newlines etc..

Man that may be an issue for SO considering it needs to be language-agnostic :S

+1'ed ;)

Answer 3

/EDIT: I've rewritten the whole posting.

Below is a pretty complete solution to the VB highlighting problem. If SO has got nothing better, please use it. VB syntax highlighting is definitely wanted.

I've also added a code example with some complex code literals that gets highlighted correctly. However, I haven't even tried to get XLinq right. Might still work, though. The keywords list is taken from the MSDN. Contextual keywords are not included. Did you know the GetXmlNamespace operator?

The algorithm knows literal type characters. It should also be able to handle identifier type characters but I haven't tested these. Note that the code works on HTML. As a consequence, &, < and > are required to be read as named (!) entities, not single characters.

Sorry for the long regex.

var highlightVB = function(code) {
    var regex = /("(?:""|[^"])+"c?)|('.*$)|#.+?#|(&amp;[HO])?\d+(\.\d*)?(e[+-]?\d+)?U?([SILDFR%@!#]|&amp;)?|\.\d+[FR!#]?|\s+|\w+|&amp;|&lt;|&gt;|([-+*/\\^$@!#%&<>()\[\]{}.,:=]+)/gi;

    var lines = code.split("\n");
    for (var i = 0; i < lines.length; i++) {
        var line = lines[i];

        var tokens;
        var result = "";

        while (tokens = regex.exec(line)) {
            var tok = getToken(tokens);
            switch (tok.charAt(0)) {
                case '"':
                    if (tok.charAt(tok.length - 1) == "c")
                        result += span("char", tok);
                    else
                        result += span("string", tok);
                    break;
                case "'":
                    result += span("comment", tok);
                    break;
                case '#':
                    result += span("date", tok);
                    break;
                default:
                    var c1 = tok.charAt(0);

                    if (isDigit(c1) ||
                        tok.length > 1 && c1 == '.' && isDigit(tok.charAt(1)) ||
                        tok.length > 5 && (tok.indexOf("&amp;") == 0 &&
                        tok.charAt(5) == 'H' || tok.charAt(5) == 'O')
                    )
                        result += span("number", tok);
                    else if (isKeyword(tok))
                        result += span("keyword", tok);
                    else
                        result += tok;
                    break;
            }
        }

        lines[i] = result;
    }

    return lines.join("\n");
}

var keywords = [
    "addhandler", "addressof", "alias", "and", "andalso", "as", "boolean", "byref",
    "byte", "byval", "call", "case", "catch", "cbool", "cbyte", "cchar", "cdate",
    "cdec", "cdbl", "char", "cint", "class", "clng", "cobj", "const", "continue",
    "csbyte", "cshort", "csng", "cstr", "ctype", "cuint", "culng", "cushort", "date",
    "decimal", "declare", "default", "delegate", "dim", "directcast", "do", "double",
    "each", "else", "elseif", "end", "endif", "enum", "erase", "error", "event",
    "exit", "false", "finally", "for", "friend", "function", "get", "gettype",
    "getxmlnamespace", "global", "gosub", "goto", "handles", "if", "if",
    "implements", "imports", "in", "inherits", "integer", "interface", "is", "isnot",
    "let", "lib", "like", "long", "loop", "me", "mod", "module", "mustinherit",
    "mustoverride", "mybase", "myclass", "namespace", "narrowing", "new", "next",
    "not", "nothing", "notinheritable", "notoverridable", "object", "of", "on",
    "operator", "option", "optional", "or", "orelse", "overloads", "overridable",
    "overrides", "paramarray", "partial", "private", "property", "protected",
    "public", "raiseevent", "readonly", "redim", "rem", "removehandler", "resume",
    "return", "sbyte", "select", "set", "shadows", "shared", "short", "single",
    "static", "step", "stop", "string", "structure", "sub", "synclock", "then",
    "throw", "to", "true", "try", "trycast", "typeof", "variant", "wend", "uinteger",
    "ulong", "ushort", "using", "when", "while", "widening", "with", "withevents",
    "writeonly", "xor", "#const", "#else", "#elseif", "#end", "#if"
]

var isKeyword = function(token) {
    return keywords.indexOf(token.toLowerCase()) != -1;
}

var isDigit = function(c) {
    return c >= '0' && c <= '9';
}

var getToken = function(tokens) {
    for (var i = 0; i < tokens.length; i++)
        if (tokens[i] != undefined)
            return tokens[i];
    return null;
}

var span = function(class, text) {
    return "<span class=\"" + class + "\">" + text + "</span>";
}

Code for testing:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    'set page title'
    Page.Title = "Something"
    Dim r As String = "Say ""Hello"""
    Dim i As Integer = 1234
    Dim d As Double = 1.23
    Dim s As Single = .123F
    Dim l As Long = 123L
    Dim ul As ULong = 123UL
    Dim c As Char = "x"c
    Dim h As Integer = &H0
    Dim t As Date = #5/31/1993 1:15:30 PM#
    Dim f As Single = 1.32e-5F
End Sub

Answer 4

In the meantime, you can put an extra comment character at the end of your comments to get it to look okay. For example:

Sub TestMethod()
    'Method body goes here'
End Sub

You also need to escape internal comment characters in the normal vb-fashion:

Sub TestMethod2()
    'Here''s another comment'
End Sub

Prettify still treats it as a string literal rather than a comment, but at least it looks okay.

Another method I've seen is to start comments with an extra '//, like this:

Sub TestMethod3()
    ''// one final comment
End Sub

Then it's handled like a comment, but you have to deal with C-style comment markers

Answer 5

Prettify does support VB comments as of the 8th of January 2009.

To get vb syntax highlighting working correctly you need three things;

<script type="text/javascript" src="/External/css/prettify/prettify.js"></script>
<script type="text/javascript" src="/External/css/prettify/lang-vb.js"></script>

and a PRE block around your code eg:

<PRE class="prettyprint lang-vb">
 Function SomeVB() as string
   ' do stuff
   i = i + 1
 End Function
</PRE>

Stackoverflow is missing the lang-vb.js inclusion, and the ability to specify which language via Markdown, ie: class="prettyprint lang-vb" which is why it doesn't work here.

for details on the issue: see the Prettify issues log