public void TestBadTypeReplacement()
{
var cc = new CodeContext();
cc.Add("d", Expression.Variable(typeof(int), "f"));
cc.Add("f", Expression.Constant(20.0));
var expr = ParameterReplacementExpressionVisitor.ReplaceParameters(Expression.Variable(typeof(int), "d"), cc);
}
public void TestLambda()
{
Expression <Func <testLambdaSimple, float> > lambdaExpr = t => t.pt / ((float)100.0);
CodeContext cc = new CodeContext();
var expr = ParameterReplacementExpressionVisitor.ReplaceParameters(lambdaExpr, cc);
Assert.AreEqual(lambdaExpr.ToString(), expr.ToString(), "lambda changed");
}
/// <summary>
/// See if this sequence type is actually a normal array or sub query expression hidden by an anonymous array index or similar.
/// </summary>
/// <param name="expr"></param>
/// <returns></returns>
private static Expression AttemptTranslationToArray(Expression expr, ICodeContext cc)
{
var preplacements = ParameterReplacementExpressionVisitor.ReplaceParameters(expr, cc);
var r = TranslatingExpressionVisitor.Translate(preplacements, cc.CacheCookies, e => e);
if (r == preplacements)
{
return(null);
}
return(r);
}
public void TestNoReplacement()
{
var cc = new CodeContext();
var myvar = Expression.Variable(typeof(int), "d");
var expr = ParameterReplacementExpressionVisitor.ReplaceParameters(myvar, cc);
var asp = expr as ParameterExpression;
Assert.IsNotNull(asp, "expected the returned expression to be correct");
Assert.AreEqual(typeof(int), asp.Type, "bad type coming back");
Assert.AreEqual("d", asp.Name, "variable name");
}
public void TestDeclarableParameterReplacement()
{
var e1 = DeclarableParameter.CreateDeclarableParameterExpression(typeof(int));
var e2 = DeclarableParameter.CreateDeclarableParameterExpression(typeof(int));
var cc = new CodeContext();
cc.Add(e1.ParameterName, e2);
var expr = ParameterReplacementExpressionVisitor.ReplaceParameters(e1, cc);
Assert.AreEqual(e2, expr, "value of translation");
}
public void TestSimpleReplacement()
{
var cc = new CodeContext();
cc.Add("d", Expression.Constant(20));
var expr = ParameterReplacementExpressionVisitor.ReplaceParameters(Expression.Variable(typeof(int), "d"), cc);
var asconst = expr as ConstantExpression;
Assert.IsNotNull(asconst, "constant replacement");
Assert.AreEqual(20, asconst.Value, "value of translation");
}
public void TestLambdaWithPredefinedNameAsParam()
{
/// This is basically a scope test! :-)
Expression <Func <testLambdaSimple, float> > lambdaExpr = t => t.pt / ((float)100.0);
CodeContext cc = new CodeContext();
cc.Add("t", Expression.Parameter(typeof(testLambdaSimple), "f**k"));
var expr = ParameterReplacementExpressionVisitor.ReplaceParameters(lambdaExpr, cc);
Assert.AreEqual(lambdaExpr.ToString(), expr.ToString(), "lambda changed");
Assert.AreEqual("f**k", (cc.GetReplacement("t") as ParameterExpression).Name, "code context was altered");
}
public void TestSubqueryPatternReplacement()
{
var qexpr = new QuerySourceReferenceExpression(new dummyQuerySource());
CodeContext cc = new CodeContext();
cc.Add("d", Expression.Variable(typeof(int), "f"));
cc.Add(qexpr.ReferencedQuerySource, Expression.Parameter(typeof(int), "d"));
var expr = ParameterReplacementExpressionVisitor.ReplaceParameters(qexpr, cc);
var asp = expr as ParameterExpression;
Assert.IsNotNull(asp, "expected the returned expression to be of type ParameterExpression");
Assert.AreEqual(typeof(int), asp.Type, "bad type coming back");
Assert.AreEqual("f", asp.Name, "variable name");
}
public void TestArrayReplacement()
{
var myvar = Expression.Variable(typeof(int[]), "d");
var myref = Expression.ArrayIndex(myvar, Expression.Constant(1));
var cc = new CodeContext();
cc.Add("d", Expression.Variable(typeof(int[]), "dude"));
var expr = ParameterReplacementExpressionVisitor.ReplaceParameters(myref, cc);
var be = expr as BinaryExpression;
Assert.AreEqual(ExpressionType.ArrayIndex, be.NodeType, "index bad");
var pe = be.Left as ParameterExpression;
Assert.IsNotNull(pe, "bad array value");
Assert.AreEqual("dude", pe.Name, "array parameter name");
}
public void TestArrayIndexReplacement()
{
var myarray = Expression.Variable(typeof(int[]), "darray");
var myindex = Expression.Variable(typeof(int), "d");
var myref = Expression.ArrayIndex(myarray, myindex);
var cc = new CodeContext();
cc.Add("d", Expression.Constant(10));
var expr = ParameterReplacementExpressionVisitor.ReplaceParameters(myref, cc);
var be = expr as BinaryExpression;
Assert.AreEqual(ExpressionType.ArrayIndex, be.NodeType, "index bad");
var ce = be.Right as ConstantExpression;
Assert.IsNotNull(ce, "reference to constant failed");
Assert.AreEqual(10, ce.Value, "value of array index");
}
public IArrayInfo GetIArrayInfo(Expression expr, IGeneratedQueryCode gc, ICodeContext cc, CompositionContainer container, Func <Expression, IArrayInfo> ReGetIArrayInfo)
{
if (!(expr is QuerySourceReferenceExpression))
{
return(null);
}
var preplacements = ParameterReplacementExpressionVisitor.ReplaceParameters(expr, cc);
var r = TranslatingExpressionVisitor.Translate(preplacements, cc.CacheCookies, e => e);
//
// If we don't know what we are doing here, bail!
//
if (r == expr)
{
return(null);
}
return(ReGetIArrayInfo(r));
}
/// <summary>
/// Visit an expression. For each expression first make sure that it has been
/// translated and parameter replaced. We do this recusively...
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public override Expression Visit(Expression expression)
{
//
// Sometimes we are called with a null - we ignore that! :-)
//
if (expression == null)
{
return(null);
}
///
/// See if there are any parameter replacements that can be done out-of-band
///
var expr = ParameterReplacementExpressionVisitor.ReplaceParameters(expression, CodeContext);
//
// Next, attempt to translate the expr (if needed). This deals with moving from
// one pre-done space to another.
//
string oldExpr = "";
while (expr.ToString() != oldExpr)
{
oldExpr = expr.ToString();
expr = TranslatingExpressionVisitor.Translate(expr, CodeContext.CacheCookies, e => e.Resolve(GeneratedCode, CodeContext, MEFContainer));
}
//
// Now do the rest of the parsing.
//
return(base.Visit(expr));
}
/// <summary>
/// Return a new expression with the parameters replaced.
/// </summary>
/// <param name="expr"></param>
/// <param name="context"></param>
/// <returns></returns>
public static Expression ReplaceParameters(Expression expr, ICodeContext context)
{
var prep = new ParameterReplacementExpressionVisitor(context);
return(prep.Visit(expr));
}