How to retrieve less variable using dotless asp.net

Question

I'm using dotless library for compile .less files in my asp.net web-site. And I want to get value of some variable by name.

For example, I have code like this:

@FONT_SIZE: 10px;
@TEXT_COLOR: red;

So, how can I get font size by "FONT_SIZE" name? I found FindVariable method in Env class, but I don't understand how to use it.

Are you having problems precompiling the .less file or do you just want to know how to use .less variables? — Jun Wei Lee, Dec 06 '13 at 14:21
I want to use following code: Env env = new Env(); string result = env.FindVariable("FONT_SIZE").Value.ToString(); — Sergey, Dec 06 '13 at 15:35

score 1 · Accepted Answer · edited Apr 08 '15 at 09:07

I have solved my issue using this code:

string GetLessVariableByName(string name, string lessContent) {
    int optimisation = 1;
    Func<IStylizer> defaultStylizer = () => new PlainStylizer();
    Func<IImporter> defaultImporter = () => new Importer();
    Func<Parser> defaultParser = () => new Parser(optimisation, defaultStylizer(), defaultImporter());
    Func<Env> defaultEnv = () => { return new Env(); };
    Env env = defaultEnv();
    Parser parser = defaultParser();
    var tree = parser.Parse(lessContent.Trim(), "tmp.less");
    var rule = tree.Rules.ToArray()[0];
    Node node = rule.Evaluate(env);
    var variableValue = tree.Variable(name, node);

    return variableValue == null ? null : variableValue.Value.ToString();
}

score 0 · Answer 2 · edited May 23 '17 at 12:28

0

I wonder if your env will be static (needed to read your value). I think you should read your less file as text and use something like a regular expression to get your value. See: Import LESS from server howto read your less files. The same problem will be discussed here: https://groups.google.com/forum/#!topic/dotless/V3SROjkTpM8

edited May 23 '17 at 12:28

Community

1
1

answered Dec 07 '13 at 13:29

Bass Jobsen

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score 0 · Answer 3 · answered Apr 25 '14 at 17:22

Yes, I would use:

int optimisation = 1; Func<IStylizer> defaultStylizer = () => new PlainStylizer(); Func<IImporter> defaultImporter = () => new Importer(); Func<Parser> defaultParser = () => new Parser(optimisation, defaultStylizer(), defaultImporter()); Func<Env> defaultEnv = () => { return new Env(); }; Env env = defaultEnv(); Parser parser = defaultParser(); var tree = parser.Parse(lessContent.Trim(), "tmp.less"); var rule = tree.Rules.ToArray()[0]; Node node = rule.Evaluate(env);

Question though, where is the ToArray() coming from on the var rule = tree.Rules.ToArray()[0]; line?

Thanks, Jason

How to retrieve less variable using dotless asp.net

3 Answers3