/// <summary>
/// Rewrites Is expression.
/// </summary>
/// <param name="asExpression">Expression to rewrite.</param>
/// <returns>Expression rewritten as code snippet.</returns>
private CodeSnippetExpression RewriteIsExpression(CodeIsExpression asExpression)
{
using (StringWriter sw = new StringWriter(CultureInfo.InvariantCulture))
{
sw.Write("(");
// VB.net doesn't allow direct comparision of types such as
// c.Id Is Integer
// this needs to be rewritten to :
// Typeof DirectCast(c.Id,Object) Is Integer
// the type comparision operator can only be used on reference types,
// hence the cast to Object before the TypeOf operator is invoked.
sw.Write("TypeOf DirectCast(");
this.generator.GenerateCodeFromExpression(asExpression.Source, sw, null);
sw.Write(" , Object )");
sw.Write(" Is ");
// Handle the CodeTypeReference issue with Byte[]
if (asExpression.TargetType.Type.BaseType == "System.Byte")
{
sw.Write("Byte()");
}
else
{
this.generator.GenerateCodeFromExpression(asExpression.TargetType, sw, null);
}
sw.Write(")");
return(new CodeSnippetExpression(sw.ToString()));
}
}
/// <summary>
/// Rewrites Is expression.
/// </summary>
/// <param name="asExpression">Expression to rewrite.</param>
/// <returns>Expression rewritten as code snippet.</returns>
private CodeSnippetExpression RewriteIsExpression(CodeIsExpression asExpression)
{
using (StringWriter sw = new StringWriter(CultureInfo.InvariantCulture))
{
sw.Write("(");
this.generator.GenerateCodeFromExpression(asExpression.Source, sw, null);
sw.Write(" is ");
this.generator.GenerateCodeFromExpression(asExpression.TargetType, sw, null);
sw.Write(")");
return(new CodeSnippetExpression(sw.ToString()));
}
}
/// <summary>
/// Rewrites CodeExpression
/// </summary>
/// <param name="e">A CodeExpression to be rewritten.</param>
/// <param name="didRewrite">A value which will be set to true if the rewriting returned a new object.</param>
/// <returns>Rewritten CodeExpression.</returns>
protected override CodeExpression Rewrite(CodeExpression e, ref bool didRewrite)
{
CodeLambdaExpression lambdaExpression = e as CodeLambdaExpression;
if (lambdaExpression != null)
{
didRewrite = true;
return(this.RewriteLambdaExpression(lambdaExpression));
}
CodeQueryExpression queryExpression = e as CodeQueryExpression;
if (queryExpression != null)
{
didRewrite = true;
return(this.RewriteComprehensionExpression(queryExpression));
}
CodeCreateAndInitializeObjectExpression objectCreateExpression = e as CodeCreateAndInitializeObjectExpression;
if (objectCreateExpression != null)
{
didRewrite = true;
return(this.RewriteCreateAndInitializeObjectExpression(objectCreateExpression));
}
CodeArrayInitializerExpression arrayInitializer = e as CodeArrayInitializerExpression;
if (arrayInitializer != null)
{
didRewrite = true;
return(this.RewriteArrayInitializerExpression(arrayInitializer));
}
CodeExclusiveOrExpression exclusiveOrExpression = e as CodeExclusiveOrExpression;
if (exclusiveOrExpression != null)
{
didRewrite = true;
return(this.RewriteExclusiveOrExpression(exclusiveOrExpression));
}
CodeAsExpression asExpression = e as CodeAsExpression;
if (asExpression != null)
{
didRewrite = true;
return(this.RewriteAsExpression(asExpression));
}
CodeIsExpression isExpression = e as CodeIsExpression;
if (isExpression != null)
{
didRewrite = true;
return(this.RewriteIsExpression(isExpression));
}
CodePrimitiveExpression primitiveExpression = e as CodePrimitiveExpression;
if (primitiveExpression != null)
{
return(this.RewritePrimitiveExpression(primitiveExpression, ref didRewrite));
}
var ternaryExpression = e as CodeTernaryExpression;
if (ternaryExpression != null)
{
didRewrite = true;
return(this.RewriteTernaryExpression(ternaryExpression));
}
var anonymousArray = e as CodeAnonymousArrayExpression;
if (anonymousArray != null)
{
didRewrite = true;
return(this.RewriteAnonymousArrayExpression(anonymousArray));
}
return(base.Rewrite(e, ref didRewrite));
}
