public void ItReadsDataFromInput()
{
//Arrange
var i = new IdentifierToken("i");
var expression = new Token[]
{
i, new ReadOperation()
};
var store = new VariableStore()
{
[i] = new ConstantToken <float>(0)
};
using (var memoryStream = new MemoryStream())
{
var writer = new StreamWriter(memoryStream);
writer.WriteLine("5");
writer.Flush();
memoryStream.Position = 0;
var executor = new PrnExpressionExecutor(memoryStream);
//Act
var result = executor.ComputeExpression(expression, store);
//Assert
memoryStream.Position = 0;
Assert.AreEqual(5, store[i].Value);
}
}
public void ItWritesDataToOutput()
{
//Arrange
var i = new IdentifierToken("i");
var expression = new Token[]
{
i, new WriteOperation()
};
var store = new VariableStore()
{
[i] = new ConstantToken <float>(5)
};
using (var memoryStream = new MemoryStream())
{
var executor = new PrnExpressionExecutor(null, memoryStream);
//Act
var result = executor.ComputeExpression(expression, store);
//Assert
memoryStream.Position = 0;
Assert.AreEqual("i = 5", new StreamReader(memoryStream).ReadToEnd());
}
}
public void ItComputesExpressionWithUnarySubtraction()
{
var expression = new Token[]
{
new ConstantToken <float>(2), new ConstantToken <float>(4), new StringToken("@"), new StringToken("+")
};
var executor = new PrnExpressionExecutor();
var result = executor.ComputeExpression(expression, new VariableStore());
Assert.AreEqual(-2, result);
}
public void ItComputesNegativeConstantExpression()
{
var expression = new Token[]
{
new ConstantToken <float>(2), new ConstantToken <float>(4), new StringToken("-")
};
var executor = new PrnExpressionExecutor();
var result = executor.ComputeExpression(expression, new VariableStore());
Assert.AreEqual(-2, result);
}
public void ItComputesConstantExpression(float operand1, float operand2, string operation, float expected)
{
var expression = new Token[]
{
new ConstantToken <float>(operand1), new ConstantToken <float>(operand2), new StringToken(operation)
};
var executor = new PrnExpressionExecutor();
var result = executor.ComputeExpression(expression, new VariableStore());
Assert.AreEqual(expected, result);
}
public void ItMakesAssignments()
{
var i = new IdentifierToken("i");
var expression = new Token[]
{
i, new ConstantToken <float>(2), new StringToken("=")
};
var store = new VariableStore()
{
[i] = new ConstantToken <float>(0)
};
var executor = new PrnExpressionExecutor();
var result = executor.ComputeExpression(expression, store);
Assert.AreEqual(2, store[i].Value);
}
public void ItComputesExpressionWithIdentifiers()
{
var i = new IdentifierToken("i");
var expression = new Token[]
{
i, i, new StringToken("+")
};
var executor = new PrnExpressionExecutor();
var result = executor.ComputeExpression(expression, new VariableStore()
{
[i] = new ConstantToken <float>(2)
});
;
Assert.AreEqual(4, result);
}
public void ItComputesNegatedLogicalExpressions()
{
var i = new IdentifierToken("i");
var res = new IdentifierToken("res");
var expression = new Token[]
{
res, i, new ConstantToken <float>(2), new StringToken("=="), new StringToken("!"), new StringToken("=")
};
var store = new VariableStore()
{
[i] = new ConstantToken <float>(2),
[res] = new ConstantToken <float>(1)
};
var executor = new PrnExpressionExecutor();
var result = executor.ComputeExpression(expression, store);
Assert.AreEqual(0, store[res].Value);
}
public void ItMakesUnconditionalJumps()
{
var i = new IdentifierToken("i");
var expression = new Token[]
{
new LabelToken("t"), new StringToken(":"),
new LabelToken("test"), new UnconditionalJumpOperation(),
i, new ConstantToken <float>(1), new StringToken("="),
new LabelToken("test"), new StringToken(":")
};
var store = new VariableStore()
{
[i] = new ConstantToken <float>(0)
};
var executor = new PrnExpressionExecutor();
var result = executor.ComputeExpression(expression, store);
Assert.AreEqual(0, store[i].Value);
}
public void ItComputesComplexExpressions()
{
var i = new IdentifierToken("i");
var res = new IdentifierToken("res");
var expression = new Token[]
{
res, new StringToken("["), i, new ConstantToken <float>(2), new StringToken("=="), i, new ConstantToken <float>(3), new StringToken("<"), new StringToken("and"),
new StringToken("]"), new StringToken("=")
};
var store = new VariableStore()
{
[i] = new ConstantToken <float>(2),
[res] = new ConstantToken <float>(0)
};
var executor = new PrnExpressionExecutor();
var result = executor.ComputeExpression(expression, store);
Assert.AreEqual(1, store[res].Value);
}
public void ItExecutesLoop()
{
var logger = new LoggerConfiguration().CreateLogger();
//Arrange
var i = new IdentifierToken("i");
var j = new IdentifierToken("j");
var res = new IdentifierToken("sum");
var lexer = new Lexer(logger);
var sequence = lexer.ParseTokens(new StringReader(@"
begin
do i=1 to 5
do j=2 to 7
sum = sum + i*j
next
next
end")).ToList();
var store = new VariableStore()
{
[i] = new ConstantToken <float>(0),
[j] = new ConstantToken <float>(0),
[res] = new ConstantToken <float>(0)
};
var prnProvider = new BasicExecutor(logger);
var labels = lexer.Labels.ToList();
var prn = prnProvider.PrnComposer.GetPrn(sequence, labels, store);
var executor = new PrnExpressionExecutor();
//Act
var result = executor.ComputeExpression(prn, store);
//Assert
Assert.AreEqual(5 + 1, store[i].Value);
Assert.AreEqual(7 + 1, store[j].Value);
Assert.AreEqual(405, store[res].Value);
}