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ParserTests.cs
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using NUnit.Framework;
using StringMath.Expressions;
namespace StringMath.Tests
{
[TestFixture]
internal class ParserTests
{
private IMathContext _context;
[OneTimeSetUp]
public void Setup()
{
_context = MathContext.Default;
}
[Test]
[TestCase("1 * 2", "1 * 2")]
[TestCase("1 ^ (6 % 2)", "1 ^ (6 % 2)")]
[TestCase("1 - ((3 + 8) max 1)", "1 - (3 + 8) max 1")]
[TestCase("5! + ({a} / 3)", "5! + {a} / 3")]
[TestCase("-9.53", "-9.53")]
[TestCase("1.15215345346", "1.15215345346")]
[TestCase("0", "0")]
[TestCase("!2", "2!")]
public void ParseMathExpression(string input, string expected)
{
Tokenizer tokenizer = new Tokenizer(input);
Parser parser = new Parser(tokenizer, _context);
IExpression result = parser.Parse();
string actual = result.ToString();
Assert.AreEqual(expected, actual);
}
[Test]
[TestCase("1 2 * 2")]
[TestCase("1 * 2 {a}")]
[TestCase("1 * {}")]
[TestCase("{}")]
[TestCase("()")]
[TestCase(")")]
[TestCase("{a}{b}")]
[TestCase("")]
[TestCase(" ")]
[TestCase("\0")]
[TestCase("\01+2")]
[TestCase("\n")]
[TestCase("\t")]
[TestCase("{")]
[TestCase("}")]
[TestCase("(1+2")]
[TestCase("1+(2")]
[TestCase("1+2)")]
[TestCase("1+")]
[TestCase("1.")]
[TestCase("1..1")]
[TestCase("--1")]
[TestCase("-+1")]
[TestCase("{")]
[TestCase("}")]
[TestCase("asd")]
[TestCase("1 + asd")]
[TestCase("{-a}")]
[TestCase("*{a}")]
[TestCase("1 + 2 1")]
public void ParseBadExpression_Exception(string input)
{
Tokenizer tokenizer = new Tokenizer(input);
Parser parser = new Parser(tokenizer, _context);
MathException exception = Assert.Throws<MathException>(() => parser.Parse());
Assert.AreEqual(MathException.ErrorCode.UNEXPECTED_TOKEN, exception.Code);
}
[Test]
[TestCase("{a} pow 3", "{a} pow 3")]
[TestCase("rand (3 + 5)", "rand(3 + 5)")]
[TestCase("rand (3 pow 5)", "rand(3 pow 5)")]
public void ParseExpression_CustomOperators(string input, string expected)
{
MathContext context = new MathContext(_context);
context.RegisterBinary("pow", (a, b) => a);
context.RegisterUnary("rand", (a) => a);
Tokenizer tokenizer = new Tokenizer(input);
Parser parser = new Parser(tokenizer, context);
IExpression result = parser.Parse();
string actual = result.ToString();
Assert.AreEqual(expected, actual);
}
[Test]
[TestCase("{a} pow 3")]
[TestCase("rand 3")]
public void ParseExpression_CustomOperators_Exception(string expected)
{
MathContext context = new MathContext();
Tokenizer tokenizer = new Tokenizer(expected);
Parser parser = new Parser(tokenizer, context);
MathException exception = Assert.Throws<MathException>(() => parser.Parse());
Assert.AreEqual(MathException.ErrorCode.UNEXPECTED_TOKEN, exception.Code);
}
[Test]
[TestCase("{a}", "a")]
[TestCase("{var}", "var")]
[TestCase("{__var}", "__var")]
[TestCase("{_}", "_")]
[TestCase("{_12}", "_12")]
[TestCase("{a_}", "a_")]
[TestCase("{a_a}", "a_a")]
[TestCase("{a123_}", "a123_")]
[TestCase("{a13}", "a13")]
public void ParseVariableExpression(string expected, string name)
{
Tokenizer tokenizer = new Tokenizer(expected);
Parser parser = new Parser(tokenizer, _context);
IExpression result = parser.Parse();
string actual = result.ToString();
Assert.IsInstanceOf<VariableExpression>(result);
Assert.AreEqual(name, ((VariableExpression)result).Name);
Assert.AreEqual(expected, actual);
}
[Test]
[TestCase("{}")]
[TestCase("{1a}")]
[TestCase("{123}")]
[TestCase("{ }")]
[TestCase("{ a }")]
[TestCase("{-a}")]
public void ParseVariableExpression_Exception(string expected)
{
Tokenizer tokenizer = new Tokenizer(expected);
Parser parser = new Parser(tokenizer, _context);
MathException exception = Assert.Throws<MathException>(() => parser.Parse());
Assert.AreEqual(MathException.ErrorCode.UNEXPECTED_TOKEN, exception.Code);
}
[Test]
[TestCase("10 + 3", "10 + 3")]
[TestCase("cos(90.0) - 5", "cos(90) - 5")]
[TestCase("round(1) * (2 + 3)", "round(1) * (2 + 3)")]
[TestCase("!1.5 / 3", "1.5! / 3")]
[TestCase("1.5! ^ sqrt 3", "1.5! ^ sqrt(3)")]
[TestCase("{a} - abs (5 % 3)", "{a} - abs(5 % 3)")]
[TestCase("{a} - 3 + {b}", "{a} - 3 + {b}")]
[TestCase("{a} / 3 * {b}", "{a} / 3 * {b}")]
[TestCase("1 + 2 + 3", "1 + 2 + 3")]
[TestCase("1 / 2 / 3", "1 / 2 / 3")]
public void ParseBinaryExpression(string input, string expected)
{
Tokenizer tokenizer = new Tokenizer(input);
Parser parser = new Parser(tokenizer, _context);
IExpression result = parser.Parse();
string actual = result.ToString(_context);
Assert.IsInstanceOf<BinaryExpression>(result);
Assert.AreEqual(expected, actual);
}
[Test]
[TestCase("sin(90.0 + 2)", "sin(90 + 2)")]
[TestCase("cos(90.0)", "cos(90)")]
[TestCase("round(1)", "round(1)")]
[TestCase("!1.5", "1.5!")]
[TestCase("1.5!", "1.5!")]
[TestCase("abs.5", "abs(0.5)")]
[TestCase("-999", "-999")]
[TestCase("sqrt(-999 / 2 * 3 max 5)", "sqrt(-999 / 2 * 3 max 5)")]
[TestCase("-(sqrt5)", "-(sqrt(5))")]
[TestCase("- sqrt5", "-(sqrt(5))")]
[TestCase("sqrt{a}", "sqrt({a})")]
public void ParseUnaryExpression(string input, string expected)
{
Tokenizer tokenizer = new Tokenizer(input);
Parser parser = new Parser(tokenizer, _context);
IExpression result = parser.Parse();
string actual = result.ToString(_context);
Assert.IsInstanceOf<UnaryExpression>(result);
Assert.AreEqual(expected, actual);
}
[Test]
[TestCase("fail 5")]
[TestCase("-+5")]
[TestCase("+5")]
public void ParseUnaryExpression_Exception(string input)
{
Tokenizer tokenizer = new Tokenizer(input);
Parser parser = new Parser(tokenizer, _context);
MathException exception = Assert.Throws<MathException>(() => parser.Parse());
Assert.AreEqual(MathException.ErrorCode.UNEXPECTED_TOKEN, exception.Code);
}
[Test]
[TestCase("1", "1")]
[TestCase("1.5", "1.5")]
[TestCase(".5", "0.5")]
[TestCase("9999999", "9999999")]
public void ParseConstantExpression(string input, string expected)
{
Tokenizer tokenizer = new Tokenizer(input);
Parser parser = new Parser(tokenizer, _context);
IExpression result = parser.Parse();
string actual = result.ToString(_context);
Assert.IsInstanceOf<ConstantExpression>(result);
Assert.AreEqual(expected, actual);
}
[Test]
[TestCase("1a")]
[TestCase("1.a")]
[TestCase(".5a")]
[TestCase(".a")]
[TestCase("9.01+")]
public void ParseConstantExpression_Exception(string expected)
{
Tokenizer tokenizer = new Tokenizer(expected);
Parser parser = new Parser(tokenizer, _context);
MathException exception = Assert.Throws<MathException>(() => parser.Parse());
Assert.AreEqual(MathException.ErrorCode.UNEXPECTED_TOKEN, exception.Code);
}
[Test]
[TestCase("(1)", "1")]
[TestCase("((1))", "1")]
[TestCase("(1 + 2)", "1 + 2")]
[TestCase("((1 + 2) % 3)", "(1 + 2) % 3")]
[TestCase("(5! * (1 + 2))", "5! * (1 + 2)")]
[TestCase("(5 + (1 + 2))", "5 + 1 + 2")]
[TestCase("((5 - {a}) + (1 + 2))", "5 - {a} + 1 + 2")]
[TestCase("((5 - 2) + (1 + 2! * 3))", "5 - 2 + 1 + 2! * 3")]
[TestCase("((5 - 2) + ((-1 + 2) * 3))", "5 - 2 + (-1 + 2) * 3")]
public void ParseGroupingExpression(string input, string expected)
{
Tokenizer tokenizer = new Tokenizer(input);
Parser parser = new Parser(tokenizer, _context);
IExpression result = parser.Parse();
string actual = result.ToString(_context);
Assert.AreEqual(expected, actual);
}
[Test]
[TestCase("()")]
[TestCase("(")]
[TestCase("(1")]
[TestCase("(1")]
[TestCase("((1)")]
[TestCase("1 + 2(")]
[TestCase("(1 + 2 * 3")]
[TestCase("5 - 2( + (1 + 2)")]
[TestCase("({a} + (1 + 2)")]
public void ParseGroupingExpression_Fail(string expected)
{
Tokenizer tokenizer = new Tokenizer(expected);
Parser parser = new Parser(tokenizer, _context);
MathException exception = Assert.Throws<MathException>(() => parser.Parse());
Assert.AreEqual(MathException.ErrorCode.UNEXPECTED_TOKEN, exception.Code);
}
}
}