/// <summary>
/// Reads a primary decrement expression.
/// </summary>
/// <param name="leftHandSide">The expression on the left hand side of the operator.</param>
/// <param name="previousPrecedence">The precedence of the expression just before this one.</param>
/// <returns>Returns the expression.</returns>
private DecrementExpression GetPrimaryDecrementExpression(
Expression leftHandSide, ExpressionPrecedence previousPrecedence)
{
Param.AssertNotNull(leftHandSide, "leftHandSide");
Param.Ignore(previousPrecedence);
DecrementExpression expression = null;
// Check the previous precedence to see if we are allowed to gather up the as expression.
if (CheckPrecedence(previousPrecedence, ExpressionPrecedence.Primary))
{
var expressionReference = new Reference<ICodePart>();
// Make sure the left hand side has at least one token.
Debug.Assert(leftHandSide.Tokens.First != null, "The left hand side should not be empty");
// Get the decrement symbol.
this.tokens.Add(this.GetOperatorToken(OperatorType.Decrement, expressionReference));
// Create the partial token list for the expression.
CsTokenList partialTokens = new CsTokenList(this.tokens, leftHandSide.Tokens.First, this.tokens.Last);
// Create and return the expression.
expression = new DecrementExpression(partialTokens, leftHandSide, DecrementExpression.DecrementType.Postfix);
expressionReference.Target = expression;
}
return expression;
}
/// <summary>
/// Reads a unary decrement expression.
/// </summary>
/// <param name="unsafeCode">Indicates whether the code being parsed resides in an unsafe code block.</param>
/// <returns>Returns the expression.</returns>
private DecrementExpression GetUnaryDecrementExpression(bool unsafeCode)
{
Param.Ignore(unsafeCode);
var expressionReference = new Reference<ICodePart>();
// Get the decrement symbol.
Node<CsToken> tokenNode = this.tokens.InsertLast(this.GetOperatorToken(OperatorType.Decrement, expressionReference));
// Get the expression being decremented.
Expression valueExpression = this.GetNextExpression(ExpressionPrecedence.Unary, expressionReference, unsafeCode);
if (valueExpression == null || valueExpression.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 DecrementExpression(partialTokens, valueExpression, DecrementExpression.DecrementType.Prefix);
expressionReference.Target = expression;
return expression;
}
private DecrementExpression GetPrimaryDecrementExpression(Expression leftHandSide, ExpressionPrecedence previousPrecedence)
{
DecrementExpression expression = null;
if (CheckPrecedence(previousPrecedence, ExpressionPrecedence.Primary))
{
this.tokens.Add(this.GetOperatorToken(OperatorType.Decrement));
CsTokenList tokens = new CsTokenList(this.tokens, leftHandSide.Tokens.First, this.tokens.Last);
expression = new DecrementExpression(tokens, leftHandSide, DecrementExpression.DecrementType.Postfix);
}
return expression;
}