public void ParserShould_GetPrecedence_OfBracketedExpressionCorrect()
{
// arrange
var input = @"(x + y) * z";
// act
var parser = new Parser(ArithmeticGrammarParserTableFactory.Create(), new ArithmeticGrammarAstFactory())
{
EnableStackTrace = true
};
var ast = parser.Parse(new Tokenizer(input), new ErrorRecord(input));
// assert
Assert.That(ast, Is.AstEqual(new TimesOperator
(
position: 0,
left: new PlusOperator
(
position: 0,
left: new Identifier(0, "x"),
right: new Identifier(0, "y")
),
right: new Identifier(0, "z")
)));
}
public void ParserShould_GenerateAst_WithLeftAssociativeAddition()
{
// arrange
var input = @"x + y + z";
// act
var parser = new Parser(ArithmeticGrammarParserTableFactory.Create(), new ArithmeticGrammarAstFactory())
{
EnableStackTrace = true
};
var ast = parser.Parse(new Tokenizer(input), new ErrorRecord(input));
// assert
Assert.That(ast, Is.AstEqual(new PlusOperator
(
position: 0,
left: new PlusOperator
(
position: 0,
left: new Identifier(0, "x"),
right: new Identifier(0, "y")
),
right: new Identifier(0, "z")
)));
}
public void ParserShould_ParseExpression_WithBrackets()
{
// arrange
var input = @"(x)";
// act
var parser = new Parser(ArithmeticGrammarParserTableFactory.Create(), new ArithmeticGrammarAstFactory())
{
EnableStackTrace = true
};
var ast = parser.Parse(new Tokenizer(input), new ErrorRecord(input));
// assert
Assert.That(ast, Is.AstEqual(new Identifier(0, "x")));
}