///
/// <summary>
/// Used for delayed or continuous evaluation.
/// Use this when you want to parse the expression first and evaluate
/// it later. Or for when the same expression needs to be evaluated
/// several times. CsEvaluator instance comes from CsEval.GetEvaluator.
/// </summary>
///
/// <param name="evaluator">The CsEvaluator returned from a call to CsEval.GetEvaluator</param>
///
/// <returns>The return result of evaluating the expression</returns>
///
/// <exception cref="System.Exception" />
///
public static object Eval(CsEvaluator evaluator)
{
if (CsEval.EvalEnvironment == null)
{
throw new Exception("CsEval.EvalEnvironment must be set first. " +
"Please refer to http://www.csharp-eval.com/HowTo.php for more information");
}
try {
object result = evaluator.parser.exp().Value;
return(result);
}
catch (Antlr.Runtime.RecognitionException re) {
if (re.Token.Type == CseParser.SEMI)
{
throw new Exception("Parsing Error At EOL");
}
else
{
throw new Exception(String.Format("Parsing Error At \"{0}\"", re.Token.Text));
}
}
catch (Exception npe) {
throw new Exception("Internal error: " + npe.Message);
}
}
///
/// <summary>
/// Gets a CsEvaluator object for the expression
/// </summary>
///
/// <param name="data">Expression to evaluate</param>
///
/// <returns>CsEvaluator object for the given expression</returns>
///
public static CsEvaluator GetEvaluator(string data)
{
if (!data.TrimEnd().EndsWith("\n;"))
{
data += "\n;";
}
CseParser parser =
new CseParser(
new CommonTokenStream(
new CseLexer(
new ANTLRInputStream(
new MemoryStream(Encoding.UTF8.GetBytes(data))
)
)
)
);
CsEvaluator evaluator = new CsEvaluator();
evaluator.parser = parser;
return(evaluator);
}
///
/// <summary>
/// Used for normal evaluation.
/// </summary>
///
/// <param name="data">The expression to evaluate</param>
///
/// <returns>The return result of evaluating the expression</returns>
///
public static object Eval(string data)
{
CsEvaluator evaluator = GetEvaluator(data);
return(Eval(evaluator));
}
///
/// <summary>
/// Gets a CsEvaluator object for the expression
/// </summary>
///
/// <param name="data">Expression to evaluate</param>
///
/// <returns>CsEvaluator object for the given expression</returns>
///
public static CsEvaluator GetEvaluator(string data) {
if (!data.TrimEnd().EndsWith("\n;"))
data += "\n;";
CseParser parser =
new CseParser(
new CommonTokenStream(
new CseLexer(
new ANTLRInputStream(
new MemoryStream(Encoding.UTF8.GetBytes(data))
)
)
)
);
CsEvaluator evaluator = new CsEvaluator();
evaluator.parser = parser;
return evaluator;
}
///
/// <summary>
/// Used for delayed or continuous evaluation.
/// Use this when you want to parse the expression first and evaluate
/// it later. Or for when the same expression needs to be evaluated
/// several times. CsEvaluator instance comes from CsEval.GetEvaluator.
/// </summary>
///
/// <param name="evaluator">The CsEvaluator returned from a call to CsEval.GetEvaluator</param>
///
/// <returns>The return result of evaluating the expression</returns>
///
/// <exception cref="System.Exception" />
///
public static object Eval(CsEvaluator evaluator) {
if (CsEval.EvalEnvironment == null)
throw new Exception("CsEval.EvalEnvironment must be set first. " +
"Please refer to http://www.csharp-eval.com/HowTo.php for more information");
try {
object result = evaluator.parser.exp().Value;
return result;
}
catch (Antlr.Runtime.RecognitionException re) {
if (re.Token.Type == CseParser.SEMI)
throw new Exception("Parsing Error At EOL");
else
throw new Exception(String.Format("Parsing Error At \"{0}\"", re.Token.Text));
}
catch (Exception npe) {
throw new Exception("Internal error: " + npe.Message);
}
}
