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Fix bug when splitting text containing CJK chars

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In Segment.Split, we didn't take cell width into account
when calculating the offset, which resulted in some "fun" bugs.
I've added a new overload for Segment.Split and obsoleted the old one.

Closes #150
This commit is contained in:
Patrik Svensson
2020-12-16 23:30:03 +01:00
committed by Patrik Svensson
parent ee305702e8
commit 6932c95731
5 changed files with 125 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
src/Spectre.Console.Tests/Expectations/PanelTests.Should_Wrap_Table_With_CJK_Tables_In_Panel_Correctly.verified.txt Normal file
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@@ -0,0 +1,7 @@
┌──────────┐
│ ┌──────┐ │
│ │ 测试 │ │
│ ├──────┤ │
│ │ 测试 │ │
│ └──────┘ │
└──────────┘

20
src/Spectre.Console.Tests/Unit/PanelTests.cs
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@@ -1,5 +1,7 @@
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using Shouldly;
using Spectre.Console.Rendering;
using VerifyXunit;
using Xunit;
@@ -267,5 +269,23 @@ namespace Spectre.Console.Tests.Unit
// Then
return Verifier.Verify(console.Output);
}
[Fact]
public Task Should_Wrap_Table_With_CJK_Tables_In_Panel_Correctly()
{
// Given
var console = new PlainConsole(width: 80);
var table = new Table();
table.AddColumn("测试");
table.AddRow("测试");
var panel = new Panel(table);
// When
console.Render(panel);
// Then
return Verifier.Verify(console.Output);
}
}
}

35
src/Spectre.Console.Tests/Unit/SegmentTests.cs
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@@ -22,18 +22,43 @@ namespace Spectre.Console.Tests.Unit
[UsesVerify]
public sealed class TheSplitMethod
{
[Fact]
public Task Should_Split_Segment_Correctly()
[Theory]
[InlineData("Foo Bar", 0, "", "Foo Bar")]
[InlineData("Foo Bar", 1, "F", "oo Bar")]
[InlineData("Foo Bar", 2, "Fo", "o Bar")]
[InlineData("Foo Bar", 3, "Foo", " Bar")]
[InlineData("Foo Bar", 4, "Foo ", "Bar")]
[InlineData("Foo Bar", 5, "Foo B", "ar")]
[InlineData("Foo Bar", 6, "Foo Ba", "r")]
[InlineData("Foo Bar", 7, "Foo Bar", null)]
[InlineData("Foo 测试 Bar", 0, "", "Foo 测试 Bar")]
[InlineData("Foo 测试 Bar", 1, "F", "oo 测试 Bar")]
[InlineData("Foo 测试 Bar", 2, "Fo", "o 测试 Bar")]
[InlineData("Foo 测试 Bar", 3, "Foo", " 测试 Bar")]
[InlineData("Foo 测试 Bar", 4, "Foo ", "测试 Bar")]
[InlineData("Foo 测试 Bar", 5, "Foo 测", "试 Bar")]
[InlineData("Foo 测试 Bar", 6, "Foo 测", "试 Bar")]
[InlineData("Foo 测试 Bar", 7, "Foo 测试", " Bar")]
[InlineData("Foo 测试 Bar", 8, "Foo 测试", " Bar")]
[InlineData("Foo 测试 Bar", 9, "Foo 测试 ", "Bar")]
[InlineData("Foo 测试 Bar", 10, "Foo 测试 B", "ar")]
[InlineData("Foo 测试 Bar", 11, "Foo 测试 Ba", "r")]
[InlineData("Foo 测试 Bar", 12, "Foo 测试 Bar", null)]
public void Should_Split_Segment_Correctly(string text, int offset, string expectedFirst, string expectedSecond)
{
// Given
var style = new Style(Color.Red, Color.Green, Decoration.Bold);
var segment = new Segment("Foo Bar", style);
var context = new RenderContext(Encoding.UTF8, false);
var segment = new Segment(text, style);
// When
var result = segment.Split(3);
var (first, second) = segment.Split(context, offset);
// Then
return Verifier.Verify(result);
first.Text.ShouldBe(expectedFirst);
first.Style.ShouldBe(style);
second?.Text?.ShouldBe(expectedSecond);
second?.Style?.ShouldBe(style);
}
}

6
src/Spectre.Console/Internal/Text/Cell.cs
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@@ -8,7 +8,10 @@ namespace Spectre.Console.Internal
{
public static int GetCellLength(RenderContext context, string text)
{
return text.Sum(rune =>
return text.Sum(rune => GetCellLength(context, rune));
}
public static int GetCellLength(RenderContext context, char rune)
{
if (context.LegacyConsole)
{
@@ -33,7 +36,6 @@ namespace Spectre.Console.Internal
}
return UnicodeCalculator.GetWidth(rune);
});
}
}
}

48
src/Spectre.Console/Rendering/Segment.cs
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@@ -3,6 +3,7 @@ using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using Spectre.Console.Internal;
namespace Spectre.Console.Rendering
{
@@ -145,6 +146,7 @@ namespace Spectre.Console.Rendering
/// </summary>
/// <param name="offset">The offset where to split the segment.</param>
/// <returns>One or two new segments representing the split.</returns>
[Obsolete("Use Split(RenderContext, Int32) instead")]
public (Segment First, Segment? Second) Split(int offset)
{
if (offset < 0)
@@ -162,6 +164,44 @@ namespace Spectre.Console.Rendering
new Segment(Text.Substring(offset, Text.Length - offset), Style));
}
/// <summary>
/// Splits the segment at the offset.
/// </summary>
/// <param name="context">The render context.</param>
/// <param name="offset">The offset where to split the segment.</param>
/// <returns>One or two new segments representing the split.</returns>
public (Segment First, Segment? Second) Split(RenderContext context, int offset)
{
if (offset < 0)
{
return (this, null);
}
if (offset >= CellCount(context))
{
return (this, null);
}
var index = 0;
if (offset > 0)
{
var accumulated = 0;
foreach (var character in Text)
{
index++;
accumulated += Cell.GetCellLength(context, character);
if (accumulated >= offset)
{
break;
}
}
}
return (
new Segment(Text.Substring(0, index), Style),
new Segment(Text.Substring(index, Text.Length - index), Style));
}
/// <summary>
/// Clones the segment.
/// </summary>
@@ -219,14 +259,16 @@ namespace Spectre.Console.Rendering
while (stack.Count > 0)
{
var segment = stack.Pop();
var segmentLength = segment.CellCount(context);
// Does this segment make the line exceed the max width?
if (line.CellCount(context) + segment.CellCount(context) > maxWidth)
var lineLength = line.CellCount(context);
if (lineLength + segmentLength > maxWidth)
{
var diff = -(maxWidth - (line.Length + segment.Text.Length));
var diff = -(maxWidth - (lineLength + segmentLength));
var offset = segment.Text.Length - diff;
var (first, second) = segment.Split(offset);
var (first, second) = segment.Split(context, offset);
line.Add(first);
lines.Add(line);