Raspy is a simple arithmetic parser and evaluator written in C#, for use in any .NET project. The library primarily consists of a C# implementation of the Shunting-yard algorithm for expression parsing, and a postfix evaluator for evaluation.

Run the build script with MSBuild v4.0 (C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe or similar):

MSBuild Build.proj

You can also build using the solution in Visual Studio 2010.

Raspy.dll is compiled against the .NET Framework v3.5 Client Profile.

Include the Raspy namespace in your source file. There are a few extension methods available for the most common operations (e.g., evaluating an expression to get a result and parsing an expression to get a tokenized postfix expression queue). The extensions are available on the string class, and implemented in Raspy.RaspyExpressions:

static ExpressionQueue Parse(this string expression);
static object ParseAndEvaluate(this string expression);
static bool TryParseAndEvaluate(this string expression, out object result);

You may also invoke the steps manually:

Parser parser = new Parser();
Evaluator evaluator = new Evaluator();
string expression = "3 + 4 * 5";

object result = evaluator.Evaluate(parser.Parse(expression));

Licensed under the MIT license. See LICENSE.txt.

Copyright (c) 2012 Chad Burggraf.