private static CodeBinaryOperatorExpression CompareValueEquality(string propertyName, string otherVariableName)
{
return(new CodeBinaryOperatorExpression(
ExpressionBuilder.ThisPropertyReference(propertyName),
CodeBinaryOperatorType.ValueEquality,
OtherPropertyReference(propertyName, otherVariableName)));
}
private static CodeBinaryOperatorExpression ComparePropertyValueEqualityExpression(ArrayType propertyType,
String propertyName,
String otherVariableName)
{
// TODO: this should probably be a warning in the model
if (propertyType.RankSpecifiers.Ranks.Count() > 1)
{
throw new InvalidOperationException(
"Cannot generate equality for Array Types with more than one rank-specifier.");
}
var rankSpecifier = propertyType.RankSpecifiers.Ranks.Single();
if (rankSpecifier.Dimensions > 1)
{
throw new InvalidOperationException(
"Cannot generate equality for Array Type with more than one dimension");
}
// (this.Property.Length == other.Property.Length)
// && Enumerable.Zip(a, b, (a, b) => Object.Equals(a, b)).All(areEqual => areEqual);
var thisPropertyReference = ExpressionBuilder.ThisPropertyReference(propertyName);
var otherPropertyReference = OtherPropertyReference(propertyName, otherVariableName);
var bothNull = new CodeBinaryOperatorExpression(CompareToNull(thisPropertyReference),
CodeBinaryOperatorType.BooleanAnd,
CompareToNull(otherPropertyReference));
var bothNotNull = new CodeBinaryOperatorExpression(
ExpressionBuilder.Negate(CompareToNull(thisPropertyReference)),
CodeBinaryOperatorType.BooleanAnd,
ExpressionBuilder.Negate(CompareToNull(otherPropertyReference)));
var sameArrayLength = new CodeBinaryOperatorExpression(
new CodePropertyReferenceExpression(thisPropertyReference, "Length"),
CodeBinaryOperatorType.ValueEquality,
new CodePropertyReferenceExpression(otherPropertyReference, "Length"));
var zipExpression = new CodeMethodInvokeExpression(
new CodeMethodReferenceExpression(
new CodeTypeReferenceExpression(typeof(Enumerable)),
"Zip"),
thisPropertyReference,
otherPropertyReference,
new CodeSnippetExpression("(a, b) => Object.Equals(a,b)"));
var zipPairwiseEquality =
new CodeMethodInvokeExpression(
new CodeMethodReferenceExpression(
new CodeTypeReferenceExpression(typeof(Enumerable)),
"All"),
zipExpression,
new CodeSnippetExpression("areEqual => areEqual")
);
return(new CodeBinaryOperatorExpression(
bothNull,
CodeBinaryOperatorType.BooleanOr,
new CodeBinaryOperatorExpression(
bothNotNull,
CodeBinaryOperatorType.BooleanAnd,
new CodeBinaryOperatorExpression(sameArrayLength,
CodeBinaryOperatorType.BooleanAnd, zipPairwiseEquality))));
}
private static CodeExpression CompareObjectEquality(string propertyName, string otherVariableName)
{
return(ExpressionBuilder.ObjectEquals(ExpressionBuilder.ThisPropertyReference(propertyName),
OtherPropertyReference(propertyName, otherVariableName)));
}