private static EvaluationResult EvaluateComparison(EvaluationResult left, EvaluationResult right, Func<int, bool> operation) {
var type = PrimitiveType.InstanceFor(left.Value);
var result = type.ComparisonOperator(left, right);
if (result.IsInt32)
return Result(operation(result.Int32Value));
return result;
}
private EvaluationResult EvaluateLogicalOr(EvaluationResult left, EvaluationResult right) {
var type = PrimitiveType.InstanceFor(left.Value);
return type.LogicalOr(left, right);
}
public override EvaluationResult ComparisonOperator(EvaluationResult value, EvaluationResult other) {
if (value.IsInt32 && other.IsInt32)
return Result(value.Int32Value.CompareTo(other.Int32Value));
return Error("Integer values can only be compared to other integer values");
}
public override EvaluationResult LogicalOr(EvaluationResult value, EvaluationResult other) {
return value;
}
public override EvaluationResult EqualityOperator(EvaluationResult value, EvaluationResult other) {
if (value.IsBool && other.IsBool)
return Result(value.BoolValue == other.BoolValue);
return Error("Boolean values can only be compared to other boolean values");
}
public override EvaluationResult LogicalOr(EvaluationResult value, EvaluationResult other) {
if (value.BoolValue)
return value;
return other;
}
public abstract EvaluationResult ComparisonOperator(EvaluationResult value, EvaluationResult other);
public abstract EvaluationResult ComparisonOperator(EvaluationResult value, EvaluationResult other);
public override EvaluationResult LogicalOr(EvaluationResult value, EvaluationResult other)
{
return(value);
}
public abstract EvaluationResult EqualityOperator(EvaluationResult value, EvaluationResult other);
public override EvaluationResult ComparisonOperator(EvaluationResult value, EvaluationResult other)
{
return(value);
}
public override EvaluationResult EqualityOperator(EvaluationResult value, EvaluationResult other)
{
return(value);
}
public override EvaluationResult ComparisonOperator(EvaluationResult value, EvaluationResult other)
{
return(Error("'null' values can not be compared"));
}
private static EvaluationResult ConvertToBool(EvaluationResult value) {
//TODO: Proper type conversion
if (value.IsBool)
return value;
return Error(string.Format("Value '{0}' is not convertible to a boolean.", value));
}
public abstract EvaluationResult LogicalOr(EvaluationResult value, EvaluationResult other);
public override EvaluationResult EqualityOperator(EvaluationResult value, EvaluationResult other)
{
return(Result(value.IsNull && other.IsNull));
}
protected EvaluationResult Result(object value)
{
return(EvaluationResult.Result(value));
}
public abstract EvaluationResult LogicalOr(EvaluationResult value, EvaluationResult other);
protected EvaluationResult Error(string message)
{
return(EvaluationResult.Error(message));
}
public override EvaluationResult ComparisonOperator(EvaluationResult value, EvaluationResult other) {
return Error("Boolean values can only be compared to other boolean values");
}
public override EvaluationResult ComparisonOperator(EvaluationResult value, EvaluationResult other)
{
return(Error("Boolean values can only be compared to other boolean values"));
}
public override EvaluationResult EqualityOperator(EvaluationResult value, EvaluationResult other) {
if (value.IsInt32 && other.IsInt32)
return Result(value.Int32Value == other.Int32Value);
return Error("Integer values can only be compared to other integer values");
}
public override EvaluationResult EqualityOperator(EvaluationResult value, EvaluationResult other) {
return Result(value.IsNull && other.IsNull);
}
public override EvaluationResult LogicalAnd(EvaluationResult value, EvaluationResult other) {
return other;
}
public override EvaluationResult ComparisonOperator(EvaluationResult value, EvaluationResult other) {
return Error("'null' values can not be compared");
}
public override EvaluationResult EqualityOperator(EvaluationResult value, EvaluationResult other) {
if (value.IsString && other.IsString)
return Result(value.StringValue == other.StringValue);
return Result(false);
}
public override EvaluationResult EqualityOperator(EvaluationResult value, EvaluationResult other) {
return value;
}
private static EvaluationResult EvaluateArithmetic(EvaluationResult left, EvaluationResult right,
Func<EvaluationResult, EvaluationResult, EvaluationResult> operation) {
//TODO: Proper type conversion
var leftValue = ConvertToInt(left);
if (leftValue.IsError)
return leftValue;
var rightValue = ConvertToInt(right);
if (rightValue.IsError)
return rightValue;
return operation(leftValue, rightValue);
}
public override EvaluationResult ComparisonOperator(EvaluationResult value, EvaluationResult other) {
return value;
}
private static EvaluationResult ConvertToInt(EvaluationResult value) {
//TODO: Proper type conversion
if (value.IsInt32)
return value;
return Error(string.Format("Value '{0}' is not convertible to an integer.", value));
}
public abstract EvaluationResult EqualityOperator(EvaluationResult value, EvaluationResult other);
private static EvaluationResult EvaluateEquality(EvaluationResult left, EvaluationResult right, Func<bool, bool> operation) {
var type = PrimitiveType.InstanceFor(left.Value);
var result = type.EqualityOperator(left, right);
if (result.IsBool)
return Result(operation(result.BoolValue));
return result;
}
public override EvaluationResult LogicalAnd(EvaluationResult value, EvaluationResult other)
{
return(other);
}