public void TakeReturnsTheFirstToken()
{
//Act
var result = _keeper.Take();
//Assert
result.TokenType.Should().Be(TokenType.OpenParens);
}
private static bool TryTakeCloseParens(TokenKeeper pos)
{
if (pos.Next.TokenType == TokenType.CloseParens)
{
pos.Take();
return(true);
}
return(false);
}
private static bool TryTakeToken(TokenType tokenType, TokenKeeper pos)
{
if (pos.Next.TokenType == tokenType)
{
pos.Take();
return(true);
}
return(false);
}
private static bool TryTakeOperator(TokenKeeper pos, out OperatorToken op)
{
if (pos.Next.TokenType == TokenType.Operator)
{
op = pos.Take() as OperatorToken;
return(true);
}
op = null;
return(false);
}
private static bool TryTakeNumericLiteral(TokenKeeper pos, out ExpressionNode node)
{
if (pos.Next.TokenType == TokenType.NumericLiteral)
{
node = new NumericLiteralNode(pos.Take());
return(true);
}
node = null;
return(false);
}
public void SwapExchangesPositionWithOtherTokenKeeper()
{
//Arrange
var other = new TokenKeeper(_keeper);
other.Take();
//Act
_keeper.Swap(other);
//Assert
other.IsNext(TokenType.OpenParens).Should().BeTrue();
}
public void SwapTakesPositionFromOtherTokenKeeper()
{
//Arrange
var other = new TokenKeeper(_keeper);
other.Take();
//Act
_keeper.Swap(other);
//Assert
_keeper.IsNext(TokenType.NumericLiteral).Should().BeTrue();
}
public void DiscardWhileShouldConsumeAllMatchingTokens()
{
//Arrange
var original = new TokenKeeper(_keeper);
//Act
_keeper.DiscardWhile(TokenType.OpenParens, TokenType.NumericLiteral, TokenType.Operator);
//Assert
while (original.Next.TokenType != TokenType.CloseParens)
{
original.Take();
}
var remaining = _keeper.RemainingData();
remaining.Should().Be(original.RemainingData());
}