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Merge pull request #785 from tig/fix_763_incorrect_wordwrap

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Fix 763 incorrect wordwrap
This commit is contained in:
Charlie Kindel
2020-07-13 23:17:52 -06:00
committed by GitHub
parent 646b97dda7 6f840d7d21
commit 22ac187f5c
4 changed files with 273 additions and 62 deletions
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22
Terminal.Gui/Core/TextFormatter.cs
View File

@@ -162,6 +162,8 @@ namespace Terminal.Gui {
runes.RemoveAt (i);
runes.RemoveAt (i + 1);
i++;
} else {
runes.RemoveAt (i);
}
break;
}
@@ -182,6 +184,8 @@ namespace Terminal.Gui {
runes [i] = (Rune)' ';
runes.RemoveAt (i + 1);
i++;
} else {
runes [i] = (Rune)' ';
}
break;
}
@@ -192,7 +196,7 @@ namespace Terminal.Gui {
/// <summary>
/// Formats the provided text to fit within the width provided using word wrapping.
/// </summary>
/// <param name="text">The text to word warp</param>
/// <param name="text">The text to word wrap</param>
/// <param name="width">The width to contrain the text to</param>
/// <returns>Returns a list of word wrapped lines.</returns>
/// <remarks>
@@ -200,7 +204,7 @@ namespace Terminal.Gui {
/// This method does not do any justification.
/// </para>
/// <para>
/// Newlines ('\n' and '\r\n') sequences are honored, adding the appropriate lines to the output.
/// This method strips Newline ('\n' and '\r\n') sequences before processing.
/// </para>
/// </remarks>
public static List<ustring> WordWrap (ustring text, int width)
@@ -223,12 +227,15 @@ namespace Terminal.Gui {
end -= 1;
if (end == start)
end = start + width;
lines.Add (ustring.Make (runes.GetRange (start, end - start)).TrimSpace ());
lines.Add (ustring.Make (runes.GetRange (start, end - start)));
start = end;
if (runes[end] == ' ') {
start++;
}
}
if (start < text.RuneCount) {
lines.Add (ustring.Make (runes.GetRange (start, runes.Count - start)).TrimSpace ());
lines.Add (ustring.Make (runes.GetRange (start, runes.Count - start)));
}
return lines;
@@ -279,15 +286,13 @@ namespace Terminal.Gui {
return text;
}
// TODO: Use ustring
var words = text.Split (ustring.Make (' '));// whitespace, StringSplitOptions.RemoveEmptyEntries);
var words = text.Split (ustring.Make (' '));
int textCount = words.Sum (arg => arg.RuneCount);
var spaces = words.Length > 1 ? (width - textCount) / (words.Length - 1) : 0;
var extras = words.Length > 1 ? (width - textCount) % words.Length : 0;
var s = new System.Text.StringBuilder ();
//s.Append ($"tc={textCount} sp={spaces},x={extras} - ");
for (int w = 0; w < words.Length; w++) {
var x = words [w];
s.Append (x);
@@ -295,7 +300,6 @@ namespace Terminal.Gui {
for (int i = 0; i < spaces; i++)
s.Append (spaceChar);
if (extras > 0) {
//s.Append ('_');
extras--;
}
}
@@ -347,7 +351,7 @@ namespace Terminal.Gui {
int runeCount = runes.Count;
int lp = 0;
for (int i = 0; i < runeCount; i++) {
Rune c = text [i];
Rune c = runes [i];
if (c == '\n') {
var wrappedLines = WordWrap (ustring.Make (runes.GetRange (lp, i - lp)), width);
foreach (var line in wrappedLines) {

65
UICatalog/Scenarios/TextFormatterDemo.cs
View File

@@ -1,40 +1,54 @@
using System;
using NStack;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Terminal.Gui;
using Rune = System.Rune;
namespace UICatalog {
[ScenarioMetadata (Name: "TextFormatter Demo", Description: "Demos and tests the TextFormatter class.")]
[ScenarioCategory ("Text")]
[ScenarioCategory ("POC")]
class TextFormatterDemo : Scenario {
public override void Init (Toplevel top, ColorScheme colorScheme)
{
Application.Init ();
Top = top;
if (Top == null) {
Top = Application.Top;
}
Win = null;
}
public override void Setup ()
{
Top.Text = "Press CTRL-Q to Quit. This is the Text for the TopLevel View. TextAlignment.Centered was specified. It is intentionally very long to illustrate word wrap.\n" +
"<-- There is a new line here to show a hard line break. You should see this text bleed underneath the subviews, which start at Y = 3.";
Top.TextAlignment = TextAlignment.Centered;
Top.ColorScheme = Colors.Base;
// TODO: Move this to another Scenario that specifically tests `Views` that have no subviews.
//Top.Text = "Press CTRL-Q to Quit. This is the Text for the TopLevel View. TextAlignment.Centered was specified. It is intentionally very long to illustrate word wrap.\n" +
// "<-- There is a new line here to show a hard line break. You should see this text bleed underneath the subviews, which start at Y = 3.";
//Top.TextAlignment = TextAlignment.Centered;
//Top.ColorScheme = Colors.Base;
// Make Win smaller so sizing the window horizontally will make the
// labels shrink to zero-width
Win.X = 10;
Win.Width = Dim.Fill (10);
string text = "Hello world, how are you today? Pretty neat!\nSecond line\n\nFourth Line.";
string unicode = "Τὴ γλῶσσα μοῦ ἔδωσαν ἑλληνικὴ\nτὸ σπίτι φτωχικὸ στὶς ἀμμουδιὲς τοῦ Ὁμήρου.\nΜονάχη ἔγνοια ἡ γλῶσσα μου στὶς ἀμμουδιὲς τοῦ Ὁμήρου.";
Label blockText = new Label () { ColorScheme = Colors.TopLevel, X = 0, Y = 0, Height = 10, Width = Dim.Fill (0) };
var block = new StringBuilder ();
block.AppendLine (" ▄████ █ ██ ██▓ ▄████▄ ██████ ");
block.AppendLine (" ██▒ ▀█▒ ██ ▓██▒▓██▒ ▒██▀ ▀█ ▒██ ▒ ");
block.AppendLine ("▒██░▄▄▄░▓██ ▒██░▒██▒ ▒▓█ ▄ ░ ▓██▄ ");
block.AppendLine ("░▓█ ██▓▓▓█ ░██░░██░ ▒▓▓▄ ▄██▒ ▒ ██▒");
block.AppendLine ("░▒▓███▀▒▒▒█████▓ ░██░ ██▓ ▒ ▓███▀ ░▒██████▒▒");
block.AppendLine (" ░▒ ▒ ░▒▓▒ ▒ ▒ ░▓ ▒▓▒ ░ ░▒ ▒ ░▒ ▒▓▒ ▒ ░");
block.AppendLine (" ░ ░ ░░▒░ ░ ░ ▒ ░ ░▒ ░ ▒ ░ ░▒ ░ ░");
block.AppendLine ("░ ░ ░ ░░░ ░ ░ ▒ ░ ░ ░ ░ ░ ░ ");
block.AppendLine (" ░ ░ ░ ░ ░ ░ ░ ");
block.AppendLine (" ░ ░ ");
blockText.Text = ustring.Make (block.ToString ()); // .Replace(" ", "\u00A0"); // \u00A0 is 'non-breaking space
Win.Add (blockText);
var unicodeCheckBox = new CheckBox ("Unicode", Top.HotKeySpecifier == (Rune)' ') {
X = 0,
Y = 3,
Y = Pos.Bottom (blockText) + 1,
};
Top.Add (unicodeCheckBox);
Win.Add (unicodeCheckBox);
var alignments = Enum.GetValues (typeof (Terminal.Gui.TextAlignment)).Cast<Terminal.Gui.TextAlignment> ().ToList ();
var singleLines = new Label [alignments.Count];
@@ -48,22 +62,22 @@ namespace UICatalog {
}
var label = new Label ($"Demonstrating single-line (should clip):") { Y = Pos.Bottom (unicodeCheckBox) + 1 };
Top.Add (label);
Win.Add (label);
foreach (var alignment in alignments) {
label = new Label ($"{alignment}:") { Y = Pos.Bottom (label) };
Top.Add (label);
Win.Add (label);
singleLines [(int)alignment].Y = Pos.Bottom (label);
Top.Add (singleLines [(int)alignment]);
Win.Add (singleLines [(int)alignment]);
label = singleLines [(int)alignment];
}
label = new Label ($"Demonstrating multi-line and word wrap:") { Y = Pos.Bottom (label) };
Top.Add (label);
Win.Add (label);
foreach (var alignment in alignments) {
label = new Label ($"{alignment}:") { Y = Pos.Bottom (label) };
Top.Add (label);
Win.Add (label);
multipleLines [(int)alignment].Y = Pos.Bottom (label);
Top.Add (multipleLines [(int)alignment]);
Win.Add (multipleLines [(int)alignment]);
label = multipleLines [(int)alignment];
}
@@ -75,4 +89,5 @@ namespace UICatalog {
};
}
}
}
}

6
UICatalog/UICatalog.cs
View File

@@ -132,6 +132,12 @@ namespace UICatalog {
StringBuilder aboutMessage = new StringBuilder ();
aboutMessage.AppendLine ("UI Catalog is a comprehensive sample library for Terminal.Gui");
aboutMessage.AppendLine (@" _ ");
aboutMessage.AppendLine (@" __ _ _ _(_) ___ ___ ");
aboutMessage.AppendLine (@" / _` | | | | | / __/ __|");
aboutMessage.AppendLine (@"| (_| | |_| | || (__\__ \");
aboutMessage.AppendLine (@" \__, |\__,_|_(_)___|___/");
aboutMessage.AppendLine (@" |___/ ");
aboutMessage.AppendLine ("");
aboutMessage.AppendLine ($"Version: {typeof (UICatalogApp).Assembly.GetName ().Version}");
aboutMessage.AppendLine ($"Using Terminal.Gui Version: {typeof (Terminal.Gui.Application).Assembly.GetName ().Version}");

242
UnitTests/TextFormatterTests.cs
View File

@@ -1559,6 +1559,84 @@ namespace Terminal.Gui {
Assert.Equal ("ำ", wrappedLines [^1].ToString ());
}
[Fact]
public void WordWrap_Unicode_LineWithNonBreakingSpace ()
{
var text = ustring.Empty;
int width = 0;
List<ustring> wrappedLines;
text = "This\u00A0is\u00A0a\u00A0sentence.";
width = text.RuneCount;
wrappedLines = TextFormatter.WordWrap (text, width);
Assert.True (wrappedLines.Count == 1);
width = text.RuneCount - 1;
wrappedLines = TextFormatter.WordWrap (text, width);
Assert.Equal (2, wrappedLines.Count);
Assert.Equal (ustring.Make (text.ToRunes () [0..(text.RuneCount - 1)]).ToString (), wrappedLines [0].ToString ());
Assert.Equal (".", wrappedLines [1].ToString ());
width = text.RuneCount - 2;
wrappedLines = TextFormatter.WordWrap (text, width);
Assert.Equal (2, wrappedLines.Count);
Assert.Equal (ustring.Make (text.ToRunes () [0..(text.RuneCount - 2)]).ToString (), wrappedLines [0].ToString ());
width = text.RuneCount - 5;
wrappedLines = TextFormatter.WordWrap (text, width);
Assert.Equal (2, wrappedLines.Count);
width = (int)Math.Ceiling ((double)(text.RuneCount / 2F));
wrappedLines = TextFormatter.WordWrap (text, width);
Assert.Equal (2, wrappedLines.Count);
Assert.Equal ("This\u00A0is\u00A0a\u00A0", wrappedLines [0].ToString ());
Assert.Equal ("sentence.", wrappedLines [1].ToString ());
width = (int)Math.Ceiling ((double)(text.RuneCount / 3F));
wrappedLines = TextFormatter.WordWrap (text, width);
Assert.Equal (3, wrappedLines.Count);
Assert.Equal ("This\u00A0is", wrappedLines [0].ToString ());
Assert.Equal ("\u00a0a\u00a0sent", wrappedLines [1].ToString ());
Assert.Equal ("ence.", wrappedLines [2].ToString ());
width = (int)Math.Ceiling ((double)(text.RuneCount / 4F));
wrappedLines = TextFormatter.WordWrap (text, width);
Assert.Equal (4, wrappedLines.Count);
width = (int)Math.Ceiling ((double)text.RuneCount / text.RuneCount);
wrappedLines = TextFormatter.WordWrap (text, width);
Assert.Equal (text.RuneCount, wrappedLines.Count);
Assert.Equal ("T", wrappedLines [0].ToString ());
Assert.Equal ("h", wrappedLines [1].ToString ());
Assert.Equal ("i", wrappedLines [2].ToString ());
Assert.Equal (".", wrappedLines [^1].ToString ());
}
[Fact]
public void WordWrap_Unicode_2LinesWithNonBreakingSpace ()
{
var text = ustring.Empty;
int width = 0;
List<ustring> wrappedLines;
text = "This\u00A0is\n\u00A0a\u00A0sentence.";
width = text.RuneCount;
wrappedLines = TextFormatter.WordWrap (text, width);
Assert.True (wrappedLines.Count == 1);
width = text.RuneCount - 1;
wrappedLines = TextFormatter.WordWrap (text, width);
#pragma warning disable xUnit2013 // Do not use equality check to check for collection size.
Assert.Equal (1, wrappedLines.Count);
#pragma warning restore xUnit2013 // Do not use equality check to check for collection size.
Assert.Equal ("This\u00A0is\u00A0a\u00A0sentence.", wrappedLines [0].ToString ());
text = "\u00A0\u00A0\u00A0\u00A0\u00A0test\u00A0sentence.";
width = text.RuneCount;
wrappedLines = TextFormatter.WordWrap (text, width);
Assert.True (wrappedLines.Count == 1);
}
[Fact]
public void WordWrap_NoNewLines ()
{
@@ -1658,6 +1736,87 @@ namespace Terminal.Gui {
Assert.Equal ("(пÑивеÑ) has words.", wrappedLines [1].ToString ());
}
/// <summary>
/// WordWrap strips CRLF
/// </summary>
[Fact]
public void WordWrap_WithNewLines ()
{
var text = ustring.Empty;
int maxWidth = 0;
int expectedClippedWidth = 0;
List<ustring> wrappedLines;
text = "A sentence has words.\nA paragraph has lines.";
maxWidth = text.RuneCount;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
wrappedLines = TextFormatter.WordWrap (text, maxWidth);
#pragma warning disable xUnit2013 // Do not use equality check to check for collection size.
Assert.Equal (1, wrappedLines.Count);
#pragma warning restore xUnit2013 // Do not use equality check to check for collection size.
Assert.True (expectedClippedWidth >= wrappedLines.Max (l => l.RuneCount));
Assert.Equal ("A sentence has words.A paragraph has lines.", wrappedLines [0].ToString ());
maxWidth = text.RuneCount - 1;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
wrappedLines = TextFormatter.WordWrap (text, maxWidth);
#pragma warning disable xUnit2013 // Do not use equality check to check for collection size.
Assert.Equal (1, wrappedLines.Count);
#pragma warning restore xUnit2013 // Do not use equality check to check for collection size.
Assert.True (expectedClippedWidth >= wrappedLines.Max (l => l.RuneCount));
Assert.Equal ("A sentence has words.A paragraph has lines.", wrappedLines [0].ToString ());
maxWidth = text.RuneCount - "words.".Length;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
wrappedLines = TextFormatter.WordWrap (text, maxWidth);
Assert.Equal (2, wrappedLines.Count);
Assert.True (expectedClippedWidth >= wrappedLines.Max (l => l.RuneCount));
Assert.Equal ("A sentence has words.A paragraph has", wrappedLines [0].ToString ());
Assert.Equal ("lines.", wrappedLines [1].ToString ());
// Unicode
text = "A Unicode sentence (пÑивеÑ) has words.A Unicode Пункт has Линии.";
maxWidth = text.RuneCount;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
wrappedLines = TextFormatter.WordWrap (text, maxWidth);
Assert.True (wrappedLines.Count == 1);
Assert.True (expectedClippedWidth >= wrappedLines.Max (l => l.RuneCount));
Assert.Equal ("A Unicode sentence (пÑивеÑ) has words.A Unicode Пункт has Линии.", wrappedLines [0].ToString ());
maxWidth = text.RuneCount - 1;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
wrappedLines = TextFormatter.WordWrap (text, maxWidth);
Assert.Equal (2, wrappedLines.Count);
Assert.True (expectedClippedWidth >= wrappedLines.Max (l => l.RuneCount));
Assert.Equal ("A Unicode sentence (пÑивеÑ) has words.A Unicode Пункт has", wrappedLines [0].ToString ());
Assert.Equal ("Линии.", wrappedLines [1].ToString ());
maxWidth = text.RuneCount - "words.".Length;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
wrappedLines = TextFormatter.WordWrap (text, maxWidth);
Assert.Equal (2, wrappedLines.Count);
Assert.True (expectedClippedWidth >= wrappedLines.Max (l => l.RuneCount));
Assert.Equal ("A Unicode sentence (пÑивеÑ) has words.A Unicode Пункт has", wrappedLines [0].ToString ());
Assert.Equal ("Линии.", wrappedLines [1].ToString ());
maxWidth = text.RuneCount - "s words.".Length;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
wrappedLines = TextFormatter.WordWrap (text, maxWidth);
Assert.Equal (2, wrappedLines.Count);
Assert.True (expectedClippedWidth >= wrappedLines.Max (l => l.RuneCount));
Assert.Equal ("A Unicode sentence (пÑивеÑ) has words.A Unicode Пункт", wrappedLines [0].ToString ());
Assert.Equal ("has Линии.", wrappedLines [1].ToString ());
maxWidth = text.RuneCount - "веÑ) has words.".Length;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
wrappedLines = TextFormatter.WordWrap (text, maxWidth);
Assert.Equal (2, wrappedLines.Count);
Assert.True (expectedClippedWidth >= wrappedLines.Max (l => l.RuneCount));
Assert.Equal ("A Unicode sentence (пÑивеÑ) has words.A Unicode", wrappedLines [0].ToString ());
Assert.Equal ("Пункт has Линии.", wrappedLines [1].ToString ());
}
[Fact]
public void WordWrap_Narrow ()
{
@@ -1674,16 +1833,12 @@ namespace Terminal.Gui {
//Assert.True (wrappedLines.Count == );
Assert.True (expectedClippedWidth >= wrappedLines.Max (l => l.RuneCount));
Assert.Equal ("A", wrappedLines [0].ToString ());
// BUGBUG: WordWrap breaks down with small widths. It should not
// the following line should be "sen"...
Assert.Equal ("se", wrappedLines [1].ToString ());
Assert.Equal ("nte", wrappedLines [2].ToString ());
Assert.Equal ("nce", wrappedLines [3].ToString ());
Assert.Equal ("ha", wrappedLines [4].ToString ());
Assert.Equal ("s", wrappedLines [5].ToString ());
Assert.Equal ("wo", wrappedLines [6].ToString ());
Assert.Equal ("rds", wrappedLines [7].ToString ());
Assert.Equal (".", wrappedLines [^1].ToString ());
Assert.Equal ("sen", wrappedLines [1].ToString ());
Assert.Equal ("ten", wrappedLines [2].ToString ());
Assert.Equal ("ce", wrappedLines [3].ToString ());
Assert.Equal ("has", wrappedLines [4].ToString ());
Assert.Equal ("wor", wrappedLines [5].ToString ());
Assert.Equal ("ds.", wrappedLines [6].ToString ());
maxWidth = 2;
expectedClippedWidth = 2;
@@ -1691,10 +1846,10 @@ namespace Terminal.Gui {
//Assert.True (wrappedLines.Count == );
Assert.True (expectedClippedWidth >= wrappedLines.Max (l => l.RuneCount));
Assert.Equal ("A", wrappedLines [0].ToString ());
Assert.Equal ("s", wrappedLines [1].ToString ());
Assert.Equal ("en", wrappedLines [2].ToString ());
Assert.Equal ("te", wrappedLines [3].ToString ());
Assert.Equal (".", wrappedLines [^1].ToString ());
Assert.Equal ("se", wrappedLines [1].ToString ());
Assert.Equal ("nt", wrappedLines [2].ToString ());
Assert.Equal ("en", wrappedLines [3].ToString ());
Assert.Equal ("s.", wrappedLines [^1].ToString ());
maxWidth = 1;
expectedClippedWidth = 1;
@@ -1702,12 +1857,9 @@ namespace Terminal.Gui {
//Assert.True (wrappedLines.Count == );
Assert.True (expectedClippedWidth >= wrappedLines.Max (l => l.RuneCount));
Assert.Equal ("A", wrappedLines [0].ToString ());
// BUGBUG: WordWrap breaks down with a width of one. It should not
// provide blank lines like it does.
Assert.Equal ("", wrappedLines [1].ToString ());
Assert.Equal ("s", wrappedLines [2].ToString ());
Assert.Equal ("e", wrappedLines [3].ToString ());
Assert.Equal ("n", wrappedLines [4].ToString ());
Assert.Equal ("s", wrappedLines [1].ToString ());
Assert.Equal ("e", wrappedLines [2].ToString ());
Assert.Equal ("n", wrappedLines [3].ToString ());
Assert.Equal (".", wrappedLines [^1].ToString ());
}
@@ -2008,13 +2160,13 @@ namespace Terminal.Gui {
// Unicode
// Even # of chars
// 0123456789
text = "пÑРвРÑ";
text = "\u2660пÑРвРÑ";
maxWidth = text.RuneCount - 1;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
list = TextFormatter.Format (text, maxWidth, TextAlignment.Left, wrap);
Assert.True (list.Count == 2);
Assert.Equal ("пÑРвÐ", list [0]);
Assert.Equal ("\u2660пÑРвÐ", list [0]);
Assert.Equal ("Ñ", list [1]);
// no clip
@@ -2022,24 +2174,24 @@ namespace Terminal.Gui {
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
list = TextFormatter.Format (text, maxWidth, TextAlignment.Left, wrap);
Assert.True (list.Count == 1);
Assert.Equal ("пÑРвРÑ", list [0]);
Assert.Equal ("\u2660пÑРвРÑ", list [0]);
maxWidth = text.RuneCount + 1;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
list = TextFormatter.Format (text, maxWidth, TextAlignment.Left, wrap);
Assert.True (list.Count == 1);
Assert.Equal ("пÑРвРÑ", list [0]);
Assert.Equal ("\u2660пÑРвРÑ", list [0]);
// Unicode
// Odd # of chars
// 0123456789
text = "Ð ÑРвРÑ";
text = "\u2660 ÑРвРÑ";
maxWidth = text.RuneCount - 1;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
list = TextFormatter.Format (text, maxWidth, TextAlignment.Left, wrap);
Assert.True (list.Count == 2);
Assert.Equal ("Ð ÑРвÐ", list [0]);
Assert.Equal ("\u2660 ÑРвÐ", list [0]);
Assert.Equal ("Ñ", list [1]);
// no clip
@@ -2047,14 +2199,48 @@ namespace Terminal.Gui {
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
list = TextFormatter.Format (text, maxWidth, TextAlignment.Left, wrap);
Assert.True (list.Count == 1);
Assert.Equal ("Ð ÑРвРÑ", list [0]);
Assert.Equal ("\u2660 ÑРвРÑ", list [0]);
maxWidth = text.RuneCount + 1;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
list = TextFormatter.Format (text, maxWidth, TextAlignment.Left, wrap);
Assert.True (list.Count == 1);
Assert.Equal ("Ð ÑРвРÑ", list [0]);
Assert.Equal ("\u2660 ÑРвРÑ", list [0]);
}
[Fact]
public void Reformat_Unicode_Wrap_Spaces_NewLines ()
{
var text = ustring.Empty;
var list = new List<ustring> ();
var maxWidth = 0;
var expectedClippedWidth = 0;
var wrap = true;
// Unicode
text = "\u2460\u2461\u2462\n\u2460\u2461\u2462\u2463\u2464";
maxWidth = text.RuneCount - 1;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
list = TextFormatter.Format (text, maxWidth, TextAlignment.Left, wrap);
Assert.Equal (2, list.Count);
Assert.Equal ("\u2460\u2461\u2462", list [0]);
Assert.Equal ("\u2460\u2461\u2462\u2463\u2464", list [1]);
// no clip
maxWidth = text.RuneCount + 0;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
list = TextFormatter.Format (text, maxWidth, TextAlignment.Left, wrap);
Assert.Equal (2, list.Count);
Assert.Equal ("\u2460\u2461\u2462", list [0]);
Assert.Equal ("\u2460\u2461\u2462\u2463\u2464", list [1]);
maxWidth = text.RuneCount + 1;
expectedClippedWidth = Math.Min (text.RuneCount, maxWidth);
list = TextFormatter.Format (text, maxWidth, TextAlignment.Left, wrap);
Assert.Equal (2, list.Count);
Assert.Equal ("\u2460\u2461\u2462", list [0]);
Assert.Equal ("\u2460\u2461\u2462\u2463\u2464", list [1]);
}
}
}