/// <summary>
/// Parses the source, and returns an expression tree
/// </summary>
/// <typeparam name="T">The input parameter type</typeparam>
/// <typeparam name="TResult">The return type</typeparam>
/// <param name="expression">The expression that is parsed</param>
/// <returns></returns>
public Expression <Func <T, TResult> > Parse <T, TResult>(string expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
var tokens = Grammar.Lexer.Tokenize(expression);
return(_shuntingYard.BuildAST <T, TResult>(tokens));
}
public void PerformanceTest2()
{
var grammar = new Grammar(new QuerySyntax())
{
Strict = true
};
var lexer = new Lexer(grammar);
var parser = new Parser(grammar);
var source = "Id!=null and FirstName like '%e%' and LastName like '%e%' and BornAt<date(now()) and Address.Street like 'e%' and Address.City like '%e' or Address.Number like '%0%'";
var shuntingYard = new ShuntingYardParser(grammar);
var tokens = lexer.Tokenize(source).ToList();
var rpn = shuntingYard.BuildRPN(tokens);
var exp = shuntingYard.BuildAST <Person, bool>(tokens);
Debug.WriteLine(exp);
var expression = parser.Parse <Person, bool>(source);
var d = expression.Compile();
var sw = new Stopwatch();
sw.Start();
for (var i = 0; i < 1000; i++)
{
tokens = lexer.Tokenize(source).ToList();
}
sw.Stop();
Debug.WriteLine("source->tokens: " + sw.ElapsedMilliseconds);
sw = new Stopwatch();
sw.Start();
for (var i = 0; i < 1000; i++)
{
shuntingYard.BuildAST <Person, bool>(tokens);
}
sw.Stop();
Debug.WriteLine("infix->AST: " + sw.ElapsedMilliseconds);
}
public void PerformanceTest()
{
// this test shows that
var grammar = new Grammar(new QuerySyntax());
var lexer = new Lexer(grammar);
var parser = new Parser(grammar);
var source = "(1+3)*(5.0/0.4)-16.3e5";
//var source = "(color=white or color=green) and wheels >=10";
var shuntingYard = new ShuntingYardParser(grammar);
var tokens = lexer.Tokenize(source).ToArray();
var rpn = shuntingYard.BuildRPN(tokens);
var exp = shuntingYard.BuildAST <object, double>(tokens);
var expression = parser.Parse <object, double>(source);
var d = expression.Compile();
var sw = new Stopwatch();
sw.Start();
for (var i = 0; i < 10000; i++)
{
lexer.Tokenize(source);
}
sw.Stop();
Debug.WriteLine("tokenizing: " + sw.ElapsedMilliseconds);
sw = new Stopwatch();
sw.Start();
for (var i = 0; i < 10000; i++)
{
shuntingYard.BuildRPN(tokens);
}
sw.Stop();
Debug.WriteLine("infix->postfix: " + sw.ElapsedMilliseconds);
sw = new Stopwatch();
sw.Start();
for (var i = 0; i < 10000; i++)
{
shuntingYard.BuildAST <object, double>(tokens);
}
sw.Stop();
Debug.WriteLine("infix->AST: " + sw.ElapsedMilliseconds);
sw = new Stopwatch();
sw.Start();
for (var i = 0; i < 10000; i++)
{
parser.Parse <object, double>(source);
}
sw.Stop();
Debug.WriteLine("source->ast: " + sw.ElapsedMilliseconds);
sw = new Stopwatch();
sw.Start();
for (var i = 0; i < 10000; i++)
{
expression.Compile();
}
sw.Stop();
Debug.WriteLine("ast->IL: " + sw.ElapsedMilliseconds);
}
