bool ParseDecrementExpression(out DecrementExpression decrementExpression)
{
decrementExpression = new DecrementExpression();
if (tokenReader.Expect(LexKind.Identifier))
{
if (tokenReader.Expect(LexKind.Sub, 1))
{
if (tokenReader.Expect(LexKind.Sub, 2))
{
decrementExpression.Name = tokenReader.Peek().Value;
decrementExpression.FixType = FixType.PostFix;
tokenReader.Skip(3);
return(true);
}
}
}
if (tokenReader.Expect(LexKind.Sub))
{
if (tokenReader.Expect(LexKind.Sub, 1))
{
if (tokenReader.Expect(LexKind.Identifier, 2))
{
decrementExpression.Name = tokenReader.Peek(2).Value;
decrementExpression.FixType = FixType.PreFix;
tokenReader.Skip(3);
return(true);
}
}
}
return(false);
}
/// <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 (this.CheckPrecedence(previousPrecedence, ExpressionPrecedence.Primary))
{
// 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));
// 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);
}
return expression;
}
