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Posted 22 Oct 2011

Implementing Programming Languages Using C# 4.0

, 12 Jul 2012
An introduction to creating programming language tools using C# 4.0.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Diggins.Jigsaw
    class CSharpLiteralsGrammar : SharedGrammar
        public static Rule F = CharSet("fF");
        public static Rule L = CharSet("lL");
        public static Rule U = CharSet("uU");

        public static Rule IntSuffix = (U + Opt(L)) | (L + Opt(U));
        public static Rule FloatSuffix = CharSet("FfDdMm");
        new public static Rule Identifier = Node(SharedGrammar.Identifier);
        new public static Rule Integer = Node(SharedGrammar.Integer + Opt(IntSuffix));
        new public static Rule Float = Node(SharedGrammar.Float + Opt(FloatSuffix));

        public static Rule EscapedChar = Node(MatchChar('\\') + CharSet("\\bnrt'\""));
        public static Rule CharContent = Node(EscapedChar | ExceptCharSet("\""));
        public static Rule String = Node(MatchChar('"') + ZeroOrMore(CharContent) + MatchChar('"'));
        public static Rule Char = MatchChar('\'') + CharContent + MatchChar('\'');
        public static Rule Bool = Node(Keyword("true") | Keyword("false"));
        public static Rule Literal = Node(String | Char | Integer | Float | Bool);

        static CSharpLiteralsGrammar() { InitGrammar(typeof(CSharpLiteralsGrammar)); }

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About the Author

Christopher Diggins
Software Developer Autodesk
Canada Canada
This article was written by Christopher Diggins, a computer science nerd who currently works at Autodesk as an SDK specialist.

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