using Microsoft.PowerShell;

using System.Text;

using Xunit;

namespace Test

{

public sealed class StringBuilderTextObjectExtensionsTests

{

[Fact]

public void StringBuilderTextObjectExtensions_ViFindBeginningOfWordObjectBoundary()

{

const string wordDelimiters = PSConsoleReadLineOptions.DefaultWordDelimiters;

var buffer = new StringBuilder("Hello, world!\ncruel world.\none\n\n\n\n\ntwo\n three four.");

Assert.Equal(0, buffer.ViFindBeginningOfWordObjectBoundary(1, wordDelimiters));

}

[Fact]

public void StringBuilderTextObjectExtensions_ViFindBeginningOfWordObjectBoundary_whitespace()

{

const string wordDelimiters = PSConsoleReadLineOptions.DefaultWordDelimiters;

var buffer = new StringBuilder("Hello, world!");

Assert.Equal(6, buffer.ViFindBeginningOfWordObjectBoundary(7, wordDelimiters));

}

[Fact]

public void StringBuilderTextObjectExtensions_ViFindBeginningOfWordObjectBoundary_backwards()

{

const string wordDelimiters = PSConsoleReadLineOptions.DefaultWordDelimiters;

var buffer = new StringBuilder("Hello!\nworld!");

Assert.Equal(5, buffer.ViFindBeginningOfWordObjectBoundary(6, wordDelimiters));

}

[Fact]

public void StringBuilderTextObjectExtensions_ViFindBeginningOfWordObjectBoundary_end_of_buffer()

{

const string wordDelimiters = PSConsoleReadLineOptions.DefaultWordDelimiters;

var buffer = new StringBuilder("Hello, world!");

Assert.Equal(12, buffer.ViFindBeginningOfWordObjectBoundary(buffer.Length, wordDelimiters));

}

[Fact]

public void StringBuilderTextObjectExtensions_ViFindBeginningOfNextWordObjectBoundary()

{

const string wordDelimiters = PSConsoleReadLineOptions.DefaultWordDelimiters;

var buffer = new StringBuilder("Hello, world!\ncruel world.\none\n\n\n\n\ntwo\n three four.");

// Words |Hello|,| |world|!|\n|cruel |world|.|\n|one\n\n|\n\n|\n|two|\n |three| |four|.|

// Pos 01234 5 6 78901 2 _3 456789 01234 5 _6 789_0_1 _2_3 _4 567 _89 01234 5 6789 0

// Pos 0 1 2 3 4 5

// system under test

Assert.Equal(5, buffer.ViFindBeginningOfNextWordObjectBoundary(0, wordDelimiters));

Assert.Equal(6, buffer.ViFindBeginningOfNextWordObjectBoundary(5, wordDelimiters));

Assert.Equal(7, buffer.ViFindBeginningOfNextWordObjectBoundary(6, wordDelimiters));

Assert.Equal(12, buffer.ViFindBeginningOfNextWordObjectBoundary(7, wordDelimiters));

Assert.Equal(13, buffer.ViFindBeginningOfNextWordObjectBoundary(12, wordDelimiters));

Assert.Equal(19, buffer.ViFindBeginningOfNextWordObjectBoundary(13, wordDelimiters));

Assert.Equal(20, buffer.ViFindBeginningOfNextWordObjectBoundary(19, wordDelimiters));

Assert.Equal(25, buffer.ViFindBeginningOfNextWordObjectBoundary(20, wordDelimiters));

Assert.Equal(26, buffer.ViFindBeginningOfNextWordObjectBoundary(25, wordDelimiters));

Assert.Equal(30, buffer.ViFindBeginningOfNextWordObjectBoundary(26, wordDelimiters));

Assert.Equal(32, buffer.ViFindBeginningOfNextWordObjectBoundary(30, wordDelimiters));

Assert.Equal(34, buffer.ViFindBeginningOfNextWordObjectBoundary(32, wordDelimiters));

Assert.Equal(38, buffer.ViFindBeginningOfNextWordObjectBoundary(34, wordDelimiters));

Assert.Equal(40, buffer.ViFindBeginningOfNextWordObjectBoundary(38, wordDelimiters));

Assert.Equal(45, buffer.ViFindBeginningOfNextWordObjectBoundary(40, wordDelimiters));

Assert.Equal(46, buffer.ViFindBeginningOfNextWordObjectBoundary(45, wordDelimiters));

Assert.Equal(50, buffer.ViFindBeginningOfNextWordObjectBoundary(46, wordDelimiters));

}

}

}