public void EvaluatorTestArrayDictDataRow()
{
var eval = new ExpressionEvaluator();
//Create an array, a dictionary and a data row and add them to Globals
eval.Globals["primes"] = new int[] { 3, 5, 7, 11, 13 };
var nums = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase);
nums["one"] = "1";
nums["two"] = "2";
nums["three"] = "3";
eval.Globals["nums"] = nums;
var t = new System.Data.DataTable();
t.Columns.Add("Name", typeof(string));
t.Columns.Add("Age", typeof(int));
var row = t.NewRow();
row["Name"] = "John";
row["Age"] = 30;
eval.Globals["row"] = row;
string script;
object result;
//Test array
script = @"primes[3]";
result = eval.Evaluate(script);
Assert.AreEqual(11, result, "Unexpected computation result");
script = @"
primes[3] = 12345
primes[3]";
result = eval.Evaluate(script);
Assert.AreEqual(12345, result, "Unexpected computation result");
//Test dict
script = @"nums['three'] + nums['two'] + nums['one']";
result = eval.Evaluate(script);
Assert.AreEqual("321", result, "Unexpected computation result");
script = @"
nums['two'] = '22'
nums['three'] + nums['two'] + nums['one']
";
result = eval.Evaluate(script);
Assert.AreEqual("3221", result, "Unexpected computation result");
//Test data row
script = @"row['Name'] + ', ' + row['age']";
result = eval.Evaluate(script);
Assert.AreEqual("John, 30", result, "Unexpected computation result");
script = @"
row['Name'] = 'Jon'
row['Name'] + ', ' + row['age']";
result = eval.Evaluate(script);
Assert.AreEqual("Jon, 30", result, "Unexpected computation result");
}
public void TestEvaluator_Ops() {
var eval = new ExpressionEvaluator();
string script;
object result;
//Simple computation
script = "2*3";
result = eval.Evaluate(script);
Assert.AreEqual(6, result, "Unexpected computation result");
//Using variables
script = @"
x=2
y=4
x * y
";
result = eval.Evaluate(script);
Assert.AreEqual(8, result, "Unexpected computation result");
//Operator precedence
script = @"
x=2
y=3
x + y * 5
";
result = eval.Evaluate(script);
Assert.AreEqual(17, result, "Unexpected computation result");
//parenthesis
script = @"
x=3
y=2
1 + (x - y) * 5
";
result = eval.Evaluate(script);
Assert.AreEqual(6, result, "Unexpected computation result");
//strings
script = @"
x='2'
y='3'
x + y + 4
";
result = eval.Evaluate(script);
Assert.AreEqual("234", result, "Unexpected computation result");
//string with embedded expressions
script = @"
x = 4
y = 7
'#{x} * #{y} = #{x * y}'
";
result = eval.Evaluate(script);
Assert.AreEqual("4 * 7 = 28", result, "Unexpected computation result");
//various operators
script = @"
x = 1 + 2 * 3 # =7
y = --x # = 6
z = x * 1.5 # = 9
z -= y # = 3
";
result = eval.Evaluate(script);
Assert.AreEqual(3.0, (double) result, 0.0001, "Unexpected computation result");
//&&, || operators
script = @"x = (1 > 0) || (1/0)";
result = eval.Evaluate(script);
Assert.AreEqual(true, result, "Unexpected computation result");
//Operator precedence test
script = @"2+3*3*3";
result = eval.Evaluate(script);
Assert.AreEqual(29, result, "Operator precedence test failed.");
script = @"x = (1 < 0) && (1/0)";
result = eval.Evaluate(script);
Assert.AreEqual(false, result, "Unexpected computation result");
}
public void TestEvaluator_MemberAccess() {
var eval = new ExpressionEvaluator();
eval.Globals["foo"] = new Foo();
string script;
object result;
//Test access to field, prop, calling a method
script = @"foo.Field + ',' + foo.Prop + ',' + foo.GetStuff()";
result = eval.Evaluate(script);
Assert.AreEqual("F,P,S", result, "Unexpected computation result");
script = @"
foo.Field = 'FF'
foo.Prop = 'PP'
R = foo.Field + foo.Prop ";
result = eval.Evaluate(script);
Assert.AreEqual("FFPP", result, "Unexpected computation result");
//Test access to indexed properties
script = @"foo[3]";
result = eval.Evaluate(script);
Assert.AreEqual("#3", result, "Unexpected computation result");
script = @"foo['a']";
result = eval.Evaluate(script);
Assert.AreEqual("V-a", result, "Unexpected computation result");
// Test with string literal
script = @" '0123'.Substring(1) + 'abcd'.Length ";
result = eval.Evaluate(script);
Assert.AreEqual("1234", result, "Unexpected computation result");
}
public void TestEvaluator_Iif() {
var eval = new ExpressionEvaluator();
string script;
object result;
//Test '? :' operator
script = @"1 < 0 ? 1/0 : 'false' "; // Notice that (1/0) is not evaluated
result = eval.Evaluate(script);
Assert.AreEqual("false", result, "Unexpected computation result");
//Test iif special form
script = @"iif(1 > 0, 'true', 1/0) "; //Notice that (1/0) is not evaluated
result = eval.Evaluate(script);
Assert.AreEqual("true", result, "Unexpected computation result");
}
public void TestEvaluator_BuiltIns() {
var eval = new ExpressionEvaluator();
string script;
object result;
//Using methods imported from System.Math class
script = @"abs(-1.0) + Log10(100.0) + sqrt(9) + floor(4.5) + sin(PI/2)";
result = eval.Evaluate(script);
Assert.IsTrue(result is double, "Result is not double.");
Assert.AreEqual(11.0, (double) result, 0.001, "Unexpected computation result");
//Using methods imported from System.Environment
script = @"report = '#{MachineName}-#{OSVersion}-#{UserName}'";
result = eval.Evaluate(script);
var expected = string.Format("{0}-{1}-{2}", Environment.MachineName, Environment.OSVersion, Environment.UserName);
Assert.AreEqual(expected, result, "Unexpected computation result");
//Using special built-in methods print and format
eval.ClearOutput();
script = @"print(format('{0} * {1} = {2}', 3, 4, 3 * 4))";
eval.Evaluate(script);
result = eval.GetOutput();
Assert.AreEqual("3 * 4 = 12\r\n", result, "Unexpected computation result");
//Add custom built-in method SayHello and test it
eval.Runtime.BuiltIns.AddMethod(SayHello, "SayHello", 1, 1, "name");
script = @"SayHello('John')";
result = eval.Evaluate(script);
Assert.AreEqual("Hello, John!", result, "Unexpected computation result");
}