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/***************************************************************************************************
Copyright (C) 2025 The Qt Company Ltd.
SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
***************************************************************************************************/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using DiffPlex;
using DiffPlex.DiffBuilder;
using DiffPlex.DiffBuilder.Model;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace Test_Qt.DotNet.Generator.Support
{
internal enum DiffFormat
{
Unified /* Context, SideBySide */
}
internal static class DiffAssert
{
/// <summary>Optional sanitizer (e.g., strip timestamps/paths).</summary>
internal static Func<string, string> Sanitize { get; set; } = s => s;
/// <summary>
/// Compare two strings in memory.
/// </summary>
internal static void ContentEquals(string actual, string expected, int contextLines = 3,
DiffFormat format = DiffFormat.Unified)
{
var actualContent = Sanitize(NormalizeNewlines(actual));
var expectedContent = Sanitize(NormalizeNewlines(expected));
if (!string.Equals(expectedContent, actualContent, StringComparison.Ordinal))
FailWithDiff(expectedContent, actualContent, contextLines, format);
}
/// <summary>
/// Compare a string in memory against a file on disk.
/// </summary>
internal static void ContentEquals(string actual, FileInfo expected, int contextLines = 3,
DiffFormat format = DiffFormat.Unified)
{
if (expected is not { Exists: true })
Assert.Fail($"Expected file not found: {expected?.FullName ?? "<null>"}");
var actualContent = Sanitize(NormalizeNewlines(actual));
var expectedContent = Sanitize(NormalizeNewlines(File.ReadAllText(expected.FullName,
new UTF8Encoding(encoderShouldEmitUTF8Identifier: false))));
if (!string.Equals(expectedContent, actualContent, StringComparison.Ordinal))
FailWithDiff(expectedContent, actualContent, contextLines, format);
}
private static string NormalizeNewlines(string text)
{
return string.IsNullOrEmpty(text) ? "" : text.Replace("\r\n", "\n").Replace('\r', '\n');
}
private static void FailWithDiff(string expected, string actual, int contextLines,
DiffFormat format)
{
var diff = format switch
{
DiffFormat.Unified => BuildUnifiedDiff(expected, actual, contextLines),
_ => throw new NotSupportedException($"Diff format '{format}' not implemented.")
};
Assert.Fail("Content mismatch:\n\n" + diff);
}
private static string BuildUnifiedDiff(string expected, string actual, int contextLines)
{
var differ = new Differ();
var diffModel = new SideBySideDiffBuilder(differ).BuildDiffModel(expected, actual);
var expectedLines = diffModel.OldText.Lines;
var actualLines = diffModel.NewText.Lines;
var maxLineCount = Math.Max(expectedLines.Count, actualLines.Count);
var changedLineIndices = Enumerable.Range(0, maxLineCount)
.Where(i =>
{
var expectedLineType = i < expectedLines.Count
? expectedLines[i].Type : ChangeType.Imaginary;
var actualLineType = i < actualLines.Count
? actualLines[i].Type : ChangeType.Imaginary;
return expectedLineType != ChangeType.Unchanged
|| actualLineType != ChangeType.Unchanged;
})
.ToArray();
var diffBuilder = new StringBuilder();
diffBuilder.AppendLine("--- a/expected");
diffBuilder.AppendLine("+++ b/actual");
if (changedLineIndices.Length == 0)
return diffBuilder.ToString();
for (var changedIndex = 0; changedIndex < changedLineIndices.Length;) {
var hunkStart = Math.Max(changedLineIndices[changedIndex] - contextLines, 0);
var hunkEnd = Math.Min(changedLineIndices[changedIndex] + contextLines,
maxLineCount - 1);
// Merge adjacent hunks within context
var nextChangedIndex = changedIndex + 1;
while (nextChangedIndex < changedLineIndices.Length &&
changedLineIndices[nextChangedIndex] <= hunkEnd + contextLines) {
hunkEnd = Math.Min(changedLineIndices[nextChangedIndex] + contextLines,
maxLineCount - 1);
nextChangedIndex++;
}
var oldLineStart = FirstRealLineNumber(expectedLines, hunkStart);
var newLineStart = FirstRealLineNumber(actualLines, hunkStart);
var oldLineCount = CountRealLines(expectedLines, hunkStart, hunkEnd);
var newLineCount = CountRealLines(actualLines, hunkStart, hunkEnd);
diffBuilder.AppendLine($"@@ -{oldLineStart},{oldLineCount} +{newLineStart},"
+ $"{newLineCount} @@");
for (var lineIndex = hunkStart; lineIndex <= hunkEnd; lineIndex++) {
var expectedLine = lineIndex < expectedLines.Count
? expectedLines[lineIndex]
: new DiffPiece("", ChangeType.Imaginary, lineIndex + 1);
var actualLine = lineIndex < actualLines.Count
? actualLines[lineIndex]
: new DiffPiece("", ChangeType.Imaginary, lineIndex + 1);
if (expectedLine.Type == ChangeType.Unchanged
&& actualLine.Type == ChangeType.Unchanged) {
diffBuilder.Append(' ').AppendLine(expectedLine.Text ?? "");
continue;
}
if (expectedLine.Type != ChangeType.Unchanged
&& expectedLine.Type != ChangeType.Imaginary) {
diffBuilder.Append('-').AppendLine(expectedLine.Text ?? "");
}
if (actualLine.Type != ChangeType.Unchanged
&& actualLine.Type != ChangeType.Imaginary) {
diffBuilder.Append('+').AppendLine(actualLine.Text ?? "");
}
}
changedIndex = nextChangedIndex;
}
return diffBuilder.ToString();
}
private static int FirstRealLineNumber(IReadOnlyList<DiffPiece> lines, int index)
{
// Search forward from the given index
for (var i = index; i < lines.Count; ++i) {
if (lines[i].Position.HasValue)
return lines[i].Position.Value;
}
// Search backward from the given index
for (var i = Math.Min(index, lines.Count - 1); i >= 0; --i) {
if (lines[i].Position.HasValue)
return lines[i].Position.Value + 1;
}
return 1; // Default if no real line is found
}
private static int CountRealLines(IReadOnlyList<DiffPiece> lines, int start, int end)
{
return Enumerable.Range(start, end - start + 1)
.Count(i => i < lines.Count && lines[i].Position.HasValue);
}
}
}
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