public override ValueReference Evaluate(EvaluationContext ctx, string expression, object expectedType)
{
expression = expression.Trim();
if (expression.Length > 0 && expression[0] == '?')
{
expression = expression.Substring(1).TrimStart();
}
if (expression.Length > 3 && expression.StartsWith("var", StringComparison.Ordinal) && char.IsWhiteSpace(expression[3]))
{
expression = expression.Substring(4).TrimStart();
string variable = null;
for (int n = 0; n < expression.Length; n++)
{
if (!char.IsLetterOrDigit(expression[n]) && expression[n] != '_')
{
variable = expression.Substring(0, n);
if (!expression.Substring(n).TrimStart().StartsWith("=", StringComparison.Ordinal))
{
variable = null;
}
break;
}
if (n == expression.Length - 1)
{
variable = expression;
expression = null;
break;
}
}
if (!string.IsNullOrEmpty(variable))
{
userVariables[variable] = new UserVariableReference(ctx, variable);
}
if (expression == null)
{
return(null);
}
}
expression = ReplaceExceptionTag(expression, ctx.Options.CurrentExceptionTag);
var expr = new CSharpParser().ParseExpression(expression);
if (expr == null)
{
throw new EvaluatorException("Could not parse expression '{0}'", expression);
}
var evaluator = new NRefactoryExpressionEvaluatorVisitor(ctx, expression, expectedType, userVariables);
return(expr.AcceptVisitor(evaluator));
}
public override ValueReference Evaluate (EvaluationContext ctx, string expression, object expectedType)
{
expression = expression.TrimStart ();
if (expression.Length > 0 && expression[0] == '?')
expression = expression.Substring (1).Trim ();
if (expression.StartsWith ("var", StringComparison.Ordinal) && char.IsWhiteSpace (expression[3])) {
expression = expression.Substring (4).Trim (' ', '\t');
string variable = null;
for (int n = 0; n < expression.Length; n++) {
if (!char.IsLetterOrDigit (expression[n]) && expression[n] != '_') {
variable = expression.Substring (0, n);
if (!expression.Substring (n).Trim (' ', '\t').StartsWith ("=", StringComparison.Ordinal))
variable = null;
break;
}
if (n == expression.Length - 1) {
variable = expression;
expression = null;
break;
}
}
if (!string.IsNullOrEmpty (variable))
userVariables[variable] = new UserVariableReference (ctx, variable);
if (expression == null)
return null;
}
expression = ReplaceExceptionTag (expression, ctx.Options.CurrentExceptionTag);
var expr = new CSharpParser ().ParseExpression (expression);
if (expr == null)
throw new EvaluatorException ("Could not parse expression '{0}'", expression);
var evaluator = new NRefactoryExpressionEvaluatorVisitor (ctx, expression, expectedType, userVariables);
return expr.AcceptVisitor<ValueReference> (evaluator);
}
ValueReference Evaluate(IdentifierExpression t)
{
var visitor = new NRefactoryExpressionEvaluatorVisitor(ctx, t.Identifier, null, userVariables);
return(t.AcceptVisitor <ValueReference> (visitor));
}
ValueReference Evaluate(ThisReferenceExpression t)
{
var visitor = new NRefactoryExpressionEvaluatorVisitor(ctx, "this", null, userVariables);
return(t.AcceptVisitor <ValueReference> (visitor));
}
