m4dc4p / mg-todo

A simple language for defining todo lists, using the Mg (or MGrammar) language, from Microsoft's Oslo platform.

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mg-todo / TodoPlugin / todo4.mg
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module ToDo

{

    // Projecting our tasks into a resonable object

    // model.

    language Tasks4 {

        // Allow an empty task list.

        syntax Main = Line*;

    

        syntax Line = TaskLine | Comment;

        syntax TaskLine = Task Title DueDate?;

 
        // Allow quoted titles        

        syntax Title = SingleQuotedText | DoubleQuotedText;

        syntax DueDate = Month "-" Day "-" Year;

 
        @{Classification["Keyword"]}

        token Task = "task";

        

        // token used here because syntax causes 

        // error. ???

        @{Classification["Comment"]}

        token Comment = "#" ^('\r' | '\n')*;

        

        @{Classification["Literal"]}

        token Digit = "0".."9";

        @{Classification["Literal"]}

        token Month = Digit#1..2;

        @{Classification["Literal"]}

        token Day = Digit#1..2;

        @{Classification["Literal"]}

        token Year = Digit#2..4;

 
        @{Classification["String"]}

        token SingleQuotedText = QuotedText('"');

        @{Classification["String"]}

        token DoubleQuotedText = QuotedText("'");

        

        // Parameterized rule.        

        token QuotedText(Q) = Q (Text - Q)* Q;

        

        // Inspired by M.mg

        token Text = '"' ^('\n' | '\r')* '"'; 

        

        // Ignore whitespace

        @{Classification["Whitespace"]}

        interleave Whitespace = '\r' | ' ' | '\n';

    }

}