private static Expression CreateVariableExpressions(
IList <Expression> expressions,
VaribalesCollection variables,
NodeCollection nodes,
Expression ifNull)
{
var source = CreateVariableInnerExpressions(expressions, variables, nodes, ifNull);
if (nodes.Count == 1)
{
return(source);
}
var target = Expression.Variable(nodes.First().Type, $"value{variables.GetNextIndex()}");
variables.Add(target);
InsertExpression(expressions, variables, source, nodes.First(), ifNull, target);
return(target);
}
private static Expression CreateVariableInnerExpressions(
IList <Expression> expressions,
VaribalesCollection variables,
NodeCollection nodes,
Expression ifNull)
{
var list = nodes.ToList();
list.Reverse();
var i = 1;
Expression target;
var element = list.First();
{
switch (element)
{
case ParameterNode parameter:
{
var p = parameter.Expression;
target = p;
ParameterNextParameter(expressions, target, parameter, ifNull);
break;
}
case ConstantNode constant:
target = constant.Expression;
break;
case MethodNode method:
{
var p = Expression.Variable(method.Type, $"value{variables.GetNextIndex()}");
target = p;
variables.Add(p);
MethodNextElement(expressions, variables, target, method, ifNull);
break;
}
case ConstructorNode constructor:
{
var p = Expression.Variable(constructor.Type, $"value{variables.GetNextIndex()}");
target = p;
variables.Add(p);
ConstructorNextElement(expressions, variables, target, constructor, ifNull);
break;
}
case FunctionNode function:
{
var p = Expression.Variable(function.Type, $"value{variables.GetNextIndex()}");
target = p;
variables.Add(p);
FunctionNextElement(expressions, variables, target, function, ifNull);
break;
}
case BinaryNode binary:
{
var p = Expression.Variable(binary.Type, $"value{variables.GetNextIndex()}");
target = p;
variables.Add(p);
BinaryNextElement(expressions, variables, target, binary, ifNull);
break;
}
case UnaryNode unary:
{
var p = Expression.Variable(unary.Type, $"value{variables.GetNextIndex()}");
target = p;
variables.Add(p);
UnaryNextElement(expressions, variables, target, unary, ifNull);
break;
}
case ConditionalNode conditional:
{
var p = Expression.Variable(conditional.Type, $"value{variables.GetNextIndex()}");
target = p;
variables.Add(p);
ConditionalNextElement(expressions, variables, target, conditional, ifNull);
break;
}
case MemberInitNode memberInit:
{
var p = Expression.Variable(memberInit.Type, $"value{variables.GetNextIndex()}");
target = p;
variables.Add(p);
MemberInitNextElement(expressions, variables, target, memberInit, ifNull);
break;
}
default:
{
throw new ArgumentOutOfRangeException($"{element}");
}
}
}
var count = list.Count;
if (count == 1)
{
return(target);
}
var source = target;
for (; i < count - 1; i++)
{
element = list[i];
var p = Expression.Variable(element.Type, $"value{variables.GetNextIndex()}");
variables.Add(p);
target = p;
InsertExpression(expressions, variables, source, element, ifNull, p);
source = target;
}
return(target);
}
