public DecompiledExpressionItem(bool isComplex, PreparedExpression expression) {
if (expression == null)
throw new ArgumentNullException("expression");
//
this.isComplex = isComplex;
this.expression = expression;
}
public DecompiledExpressionItem(bool isComplex, PreparedExpression expression, Operation lastOperation)
: this(isComplex, expression) {
//
if (lastOperation == null)
throw new ArgumentNullException("lastOperation");
//
this.lastOperation = lastOperation;
}
/// <summary>
/// Returns a compiled expression for specified source string.
/// </summary>
public CompiledExpression Compile(PreparedExpression preparedExpression) {
if (preparedExpression == null)
throw new ArgumentNullException("preparedExpression");
//
OperationsStack operationsStack = new OperationsStack(operationsRegistry);
//
for (int itemIndex = 0; itemIndex < preparedExpression.PreparedExpressionItems.Count; itemIndex++) {
PreparedExpressionItem item = preparedExpression.PreparedExpressionItems[itemIndex];
// If constant or variable - add to result
if (item.Kind == PreparedExpressionItemKind.Constant)
operationsStack.PushConstant(item.Constant);
if (item.Kind == PreparedExpressionItemKind.Variable)
operationsStack.PushVariable(item.VariableName);
// If delimiter
if (item.Kind == PreparedExpressionItemKind.Delimiter) {
operationsStack.PushDelimiter(item.DelimiterKind);
}
// Signature (operator signature / part of signature / function)
if (item.Kind == PreparedExpressionItemKind.Signature) {
List<Operation> operations = new List<Operation>(operationsRegistry.GetOperationsUsingSignature(item.Signature));
operations.Sort(new Comparison<Operation>(compareOperationsByOperandsCount));
//
for (int i = 0; i < operations.Count; i++) {
Operation operation = operations[i];
// Operator
if (operation.Kind == OperationKind.Operator) {
// Unary operator
if (operation.OperandsCount == 1) {
// If operator placed at the start of subexpression
if ((itemIndex == 0) ||
((itemIndex > 0) && (preparedExpression.PreparedExpressionItems[itemIndex - 1].Kind == PreparedExpressionItemKind.Delimiter) && (preparedExpression.PreparedExpressionItems[itemIndex - 1].DelimiterKind == DelimiterKind.OpeningBrace)|| (preparedExpression.PreparedExpressionItems[itemIndex-1].DelimiterKind == DelimiterKind.Comma))) {
//
operationsStack.PushUnaryOperator(operation);
break;
}
}
// Binary operator
if (operation.OperandsCount == 2) {
operationsStack.PushBinaryOperator(operation);
break;
}
// Ternary and more
if (operation.OperandsCount > 2) {
int partNumber = 0;
for (int k = 0; k < operation.Signature.Length; k++) {
if (operation.Signature[k] == item.Signature) {
partNumber = k + 1;
break;
}
}
// If it is start part in signature
if (partNumber == 1) {
operationsStack.PushComplexOperatorFirstSignature(operation);
break;
}
//
operationsStack.PushComplexOperatorNonFirstSignature(operation, partNumber);
break;
}
}
// Function
if (operation.Kind == OperationKind.Function) {
operationsStack.PushFunction(operation);
break;
}
}
}
}
//
operationsStack.DoFinalFlush();
//
CompiledExpression res = operationsStack.GetResult();
if (!isCompiledExpressionStackBalanced(res))
throw new CompilerSyntaxException("Operands disbalance detected.");
return res;
}