public void ParseEqualsOperator()
{
Parser parser = new Parser("a == 1");
IExpression expr = parser.ParseExpression();
Assert.IsNotNull(expr);
Assert.IsInstanceOfType(expr, typeof(CompareExpression));
CompareExpression cexpr = (CompareExpression)expr;
Assert.AreEqual(ComparisonOperator.Equal, cexpr.Operation);
Assert.IsInstanceOfType(cexpr.LeftExpression, typeof(VariableExpression));
Assert.IsInstanceOfType(cexpr.RightExpression, typeof(ConstantExpression));
Assert.IsNull(parser.ParseExpression());
}
public void ParseVariable()
{
Parser parser = new Parser("foo");
IExpression expr = parser.ParseExpression();
Assert.IsNotNull(expr);
Assert.IsInstanceOfType(expr, typeof(VariableExpression));
VariableExpression vexpr = (VariableExpression)expr;
Assert.AreEqual("foo", vexpr.Name);
Assert.IsNull(parser.ParseExpression());
}
public void ParseSimpleString()
{
Parser parser = new Parser("\"foo\"");
IExpression expr = parser.ParseExpression();
Assert.IsNotNull(expr);
Assert.IsInstanceOfType(expr, typeof(ConstantExpression));
ConstantExpression cexpr = (ConstantExpression)expr;
Assert.AreEqual("foo", cexpr.Evaluate(null));
Assert.IsNull(parser.ParseExpression());
}
public void ParseSimpleCallWithParenthesisAndTwoArguments()
{
Parser parser = new Parser("puts(a, b)");
IExpression expr = parser.ParseExpression();
Assert.IsNotNull(expr);
Assert.IsInstanceOfType(expr, typeof(CallExpression));
CallExpression cexpr = (CallExpression)expr;
Assert.IsInstanceOfType(cexpr.Expression, typeof(NameExpression));
Assert.AreEqual(2, cexpr.Arguments.Count());
Assert.IsInstanceOfType(cexpr.Arguments.First(), typeof(VariableExpression));
Assert.IsInstanceOfType(cexpr.Arguments.Skip(1).First(), typeof(VariableExpression));
}
public void ParseSimpleCall()
{
Parser parser = new Parser("puts 1");
IExpression expr = parser.ParseExpression();
Assert.IsNotNull(expr);
Assert.IsInstanceOfType(expr, typeof(CallExpression));
CallExpression cexpr = (CallExpression)expr;
Assert.IsInstanceOfType(cexpr.Expression, typeof(NameExpression));
Assert.AreEqual(1, cexpr.Arguments.Count());
Assert.IsInstanceOfType(cexpr.Arguments.First(), typeof(ConstantExpression));
}
public void ParseInteger()
{
Parser parser = new Parser("123");
IExpression expr = parser.ParseExpression();
Assert.IsNotNull(expr);
Assert.IsInstanceOfType(expr, typeof(ConstantExpression));
ConstantExpression cexpr = (ConstantExpression)expr;
Assert.AreEqual(123, cexpr.Evaluate(null));
Assert.IsNull(parser.ParseExpression());
}