public void TestOperatorPrecedence()
{
var grammar = new OperatorGrammar();
var parser = new Parser(grammar);
TestHelper.CheckGrammarErrors(parser);
var parseTree = parser.Parse("x + y * z");
TestHelper.CheckParseErrors(parseTree);
Assert.IsTrue(parseTree.Root != null, "Root not found.");
Assert.IsTrue(parseTree.Root.Term.Name == "binExpr", "Expected binExpr.");
Assert.IsTrue(parseTree.Root.ChildNodes[1].Term.Name == "+", "Expected + operator."); //check that top operator is "+", not "*"
parseTree = parser.Parse("x * y + z");
TestHelper.CheckParseErrors(parseTree);
Assert.IsTrue(parseTree.Root != null, "Root not found.");
Assert.IsTrue(parseTree.Root.Term.Name == "binExpr", "Expected binExpr.");
Assert.IsTrue(parseTree.Root.ChildNodes[1].Term.Name == "+", "Expected + operator."); //check that top operator is "+", not "*"
parseTree = parser.Parse("-x * y"); //should be interpreted as -(x*y), so top operator should be -
TestHelper.CheckParseErrors(parseTree);
Assert.IsTrue(parseTree.Root != null, "Root not found.");
Assert.IsTrue(parseTree.Root.Term.Name == "unExpr", "Expected unExpr.");
Assert.IsTrue(parseTree.Root.ChildNodes[0].Term.Name == "-", "Expected - operator."); //check that top operator is "+", not "*"
}
public void TestOperatorPrecedence() {
var grammar = new OperatorGrammar();
var parser = new Parser(grammar);
TestHelper.CheckGrammarErrors(parser);
var parseTree = parser.Parse("x + y * z");
TestHelper.CheckParseErrors(parseTree);
Assert.IsTrue(parseTree.Root != null, "Root not found.");
Assert.IsTrue(parseTree.Root.Term.Name == "binExpr", "Expected binExpr.");
Assert.IsTrue(parseTree.Root.ChildNodes[1].Term.Name == "+", "Expected + operator."); //check that top operator is "+", not "*"
parseTree = parser.Parse("x * y + z");
TestHelper.CheckParseErrors(parseTree);
Assert.IsTrue(parseTree.Root != null, "Root not found.");
Assert.IsTrue(parseTree.Root.Term.Name == "binExpr", "Expected binExpr.");
Assert.IsTrue(parseTree.Root.ChildNodes[1].Term.Name == "+", "Expected + operator."); //check that top operator is "+", not "*"
parseTree = parser.Parse("-x * y"); //should be interpreted as -(x*y), so top operator should be -
TestHelper.CheckParseErrors(parseTree);
Assert.IsTrue(parseTree.Root != null, "Root not found.");
Assert.IsTrue(parseTree.Root.Term.Name == "unExpr", "Expected unExpr.");
Assert.IsTrue(parseTree.Root.ChildNodes[0].Term.Name == "-", "Expected - operator."); //check that top operator is "+", not "*"
}
