/// <summary>
/// Reads a unary expression.
/// </summary>
/// <param name="parentReference">The parent code part.</param>
/// <param name="unsafeCode">Indicates whether the code being parsed resides in an unsafe code block.</param>
/// <returns>Returns the expression.</returns>
private UnaryExpression GetUnaryExpression(Reference<ICodePart> parentReference, bool unsafeCode)
{
Param.AssertNotNull(parentReference, "parentReference");
Param.Ignore(unsafeCode);
var expressionReference = new Reference<ICodePart>();
// Create the token based on the type of the symbol.
Symbol symbol = this.GetNextSymbol(parentReference);
OperatorSymbol token;
UnaryExpression.Operator operatorType;
if (symbol.SymbolType == SymbolType.Plus)
{
operatorType = UnaryExpression.Operator.Positive;
token = new OperatorSymbol(symbol.Text, OperatorCategory.Unary, OperatorType.Positive, symbol.Location, expressionReference, this.symbols.Generated);
}
else if (symbol.SymbolType == SymbolType.Minus)
{
operatorType = UnaryExpression.Operator.Negative;
token = new OperatorSymbol(symbol.Text, OperatorCategory.Unary, OperatorType.Negative, symbol.Location, expressionReference, this.symbols.Generated);
}
else if (symbol.SymbolType == SymbolType.Not)
{
operatorType = UnaryExpression.Operator.Not;
token = new OperatorSymbol(symbol.Text, OperatorCategory.Unary, OperatorType.Not, symbol.Location, expressionReference, this.symbols.Generated);
}
else if (symbol.SymbolType == SymbolType.Tilde)
{
operatorType = UnaryExpression.Operator.BitwiseCompliment;
token = new OperatorSymbol(symbol.Text, OperatorCategory.Unary, OperatorType.BitwiseCompliment, symbol.Location, expressionReference, this.symbols.Generated);
}
else
{
// This is not a unary type.
Debug.Fail("Unexpected operator type");
throw new StyleCopException();
}
Node<CsToken> tokenNode = this.tokens.InsertLast(token);
this.symbols.Advance();
// Get the expression after the operator.
Expression innerExpression = this.GetNextExpression(ExpressionPrecedence.Unary, expressionReference, unsafeCode);
if (innerExpression == null || innerExpression.Tokens.First == null)
{
throw this.CreateSyntaxException();
}
// Create the partial token list for the expression.
CsTokenList partialTokens = new CsTokenList(this.tokens, tokenNode, this.tokens.Last);
// Create and return the expression.
var expression = new UnaryExpression(partialTokens, operatorType, innerExpression);
expressionReference.Target = expression;
return expression;
}
/// <summary>
/// Reads a NOT expression.
/// </summary>
/// <param name="sourceCode">The source code containing the expression.</param>
/// <param name="parentReference">The parent code part.</param>
/// <returns>Returns the expression.</returns>
private UnaryExpression GetConditionalPreprocessorNotExpression(SourceCode sourceCode, Reference<ICodePart> parentReference)
{
Param.AssertNotNull(sourceCode, "sourceCode");
Param.AssertNotNull(parentReference, "parentReference");
var expressionReference = new Reference<ICodePart>();
// Get the symbol.
this.AdvanceToNextConditionalDirectiveCodeSymbol(parentReference);
Symbol symbol = this.symbols.Peek(1);
Debug.Assert(symbol != null, "The next symbol should not be null");
// Create the token based on the type of the symbol.
OperatorSymbol token = new OperatorSymbol(
symbol.Text,
OperatorCategory.Unary,
OperatorType.Not,
symbol.Location,
expressionReference,
this.symbols.Generated);
Node<CsToken> tokenNode = this.tokens.InsertLast(token);
// Advance up to the symbol and add it to the document.
this.symbols.Advance();
// Get the expression after the operator.
Expression innerExpression = this.GetNextConditionalPreprocessorExpression(sourceCode, ExpressionPrecedence.Unary);
if (innerExpression == null || innerExpression.Tokens.First == null)
{
throw new SyntaxException(sourceCode, symbol.LineNumber);
}
// Create the partial token list for the expression.
CsTokenList partialTokens = new CsTokenList(this.tokens, tokenNode, this.tokens.Last);
// Create and return the expression.
var expression = new UnaryExpression(partialTokens, UnaryExpression.Operator.Not, innerExpression);
expressionReference.Target = expression;
return expression;
}