public static object Evaluate(ExpressionContext context, string expr, IExpressionPropertyFinder finder)
{
//try {
CommonAST ast;
if (!astCache.ContainsKey(expr))
{
ExpressionParser parser = CreateParser(expr);
parser.expr();
ast = parser.getAST();
lock (astCache)
{
if (!astCache.ContainsKey(expr))
astCache.Add(expr, ast);
}
}
else
{
ast = astCache[expr];
}
//Console.WriteLine(ast.ToTree());
try
{
ExpressionTreeParser my = new ExpressionTreeParser(context, finder);
return my.Evaluate(ast);
}
catch (Exception e)
{
string msg = string.Format("An error accured during evaluation of '{0}'", expr);
log.Fatal(msg, e);
throw new Exception(msg, e);
}
}
/// <summary>
/// Ctor for tree walker.
/// </summary>
/// <param name="context">Expression context</param>
/// <param name="finderInstance">Finder instance</param>
public ExpressionTreeParser(ExpressionContext context, IExpressionPropertyFinder finderInstance)
{
this.finderInstance = finderInstance;
this.context = context;
}