mathnet-numerics/src/UnitTests/LinearAlgebraTests/Single/DenseVectorTest.TextHandling.cs

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namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single
{
    using System;
    using System.Globalization;
    using LinearAlgebra.Single;
    using MbUnit.Framework;

    [TestFixture]
    public class DenseVectorTextHandlingTest
    {
        [Test]
        [Row("2", "2")]
        [Row("(3)", "3")]
        [Row("[1,2,3]", "1,2,3")]
        [Row(" [ 1 , 2 , 3 ] ", "1,2,3")]
        [Row(" [ -1 , 2 , +3 ] ", "-1,2,3")]
        [Row(" [1.2,3.4 , 5.6] ", "1.2,3.4,5.6")]
        public void CanParseDoubleDenseVectorsWithInvariant(string stringToParse, string expectedToString)
        {
            var formatProvider = CultureInfo.InvariantCulture;
            DenseVector vector = DenseVector.Parse(stringToParse, formatProvider);

            Assert.AreEqual(expectedToString, vector.ToString(formatProvider));
        }

        [Test]
        [Row(" 1.2,3.4 , 5.6 ", "1.2,3.4,5.6", "en-US")]
        [Row(" 1.2;3.4 ; 5.6 ", "1.2;3.4;5.6", "de-CH")]
        [Row(" 1,2;3,4 ; 5,6 ", "1,2;3,4;5,6", "de-DE")]
        public void CanParseDoubleDenseVectorsWithCulture(string stringToParse, string expectedToString, string culture)
        {
            var formatProvider = CultureInfo.GetCultureInfo(culture);
            DenseVector vector = DenseVector.Parse(stringToParse, formatProvider);

            Assert.AreEqual(expectedToString, vector.ToString(formatProvider));
        }

        [Test]
        [Row("15")]
        [Row("1{0}2{1}3{0}4{1}5{0}6")]
        public void CanParseDoubleDenseVectors(string vectorAsString)
        {
            var mappedString = String.Format(
                vectorAsString,
                CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator,
                CultureInfo.CurrentCulture.TextInfo.ListSeparator);

            DenseVector vector = DenseVector.Parse(mappedString);

            Assert.AreEqual(mappedString, vector.ToString());
        }

        [Test]
        [MultipleAsserts]
        public void ParseThrowsFormatExceptionIfMissingClosingParen()
        {
            Assert.Throws<FormatException>(() => DenseVector.Parse("(1"));
            Assert.Throws<FormatException>(() => DenseVector.Parse("[1"));
        }

        [Test]
        public void CanTryParseDoubleDenseVector()
        {
            var data = new[] { 1.2f, 3.4f, 5.6e-78f };
            var text = String.Format(
                "{1}{0}{2}{0}{3}",
                CultureInfo.CurrentCulture.TextInfo.ListSeparator,
                data[0],
                data[1],
                data[2]);

            DenseVector vector;
            var ret = DenseVector.TryParse(text, out vector);
            Assert.IsTrue(ret);
            AssertHelpers.AlmostEqualList(data, vector.Data, 1e-15);

            ret = DenseVector.TryParse(text, CultureInfo.CurrentCulture, out vector);
            Assert.IsTrue(ret);
            AssertHelpers.AlmostEqualList(data, vector.Data, 1e-15);
        }

        [Test]
        [Row(null)]
        [Row("")]
        [Row(",")]
        [Row("1,")]
        [Row(",1")]
        [Row("1,2,")]
        [Row(",1,2,")]
        [Row("1,,2,,3")]
        [Row("1e+")]
        [Row("1e")]
        [Row("()")]
        [Row("[  ]")]
        public void TryParseReturnsFalseWhenGivenBadValueWithInvariant(string str)
        {
            DenseVector vector;
            var ret = DenseVector.TryParse(str, CultureInfo.InvariantCulture, out vector);
            Assert.IsFalse(ret);
            Assert.IsNull(vector);
        }
    }
}