666

QWERTYkez.WordProcessor/MultiReplace.cs

@@ -1,18 +1,8 @@
 namespace QWERTYkez.WordProcessor;
 
-#if DEBUG
-public static class Debugger
-{
-    public static StringBuilder Builder { get; } = new();
-}
-#endif
-
 /// <summary>
 /// Выполняет замену всех вхождений ключей из словаря на соответствующие массивы значений.
-/// Каждое значение из массива помещается в отдельный параграф, причём первое значение
-/// остаётся в текущем параграфе, а последующие создают новые.
-/// Текст между вхождениями и после последнего сохраняется в соответствующих параграфах.
-/// Поддерживает разрывы страниц и смену ориентации (альбомная/книжная) через <see cref="ReplaceItem.SplitValue"/>.
+/// Поддерживает разрывы страниц и смену ориентации (альбомная/книжная) через <see cref="ReplaceItem"/>.
 /// </summary>
 internal static class MultiReplaceExt
 {
@@ -236,7 +226,7 @@ internal static class MultiReplaceExt
         return newPara;
     }
 
-    private static void InsertFormattedRun(Paragraph para, ReplaceItem item, ParagraphStructure structure, int position)
+    private static void InsertFormattedRun(Paragraph para, string text, ParagraphStructure structure, int position)
     {
         var seg = structure.Segments.FirstOrDefault(s => position >= s.Start && position < s.End);
         if (seg is null) return;
@@ -244,19 +234,19 @@ internal static class MultiReplaceExt
         var textRun = new Run();
         if (seg.Run.RunProperties is not null)
             textRun.RunProperties = (RunProperties)seg.Run.RunProperties.CloneNode(true);
-        textRun.AppendChild(new Text(item.Text ?? string.Empty));
+        textRun.AppendChild(new Text(text));
         para.AppendChild(textRun);
     }
 
-    /// <summary>
-    /// Добавляет SectionProperties к параграфу. Все значения (PageSize, PageMargin) берутся из документа.
-    /// Для книжных секций (addPageSize=false) Orient не устанавливается (not set).
-    /// </summary>
-    private static void AddSectionProperties(Paragraph para, PageBreakType splitValue, bool addPageSize, SectionProperties sourceSection, SectionProperties portraitSection)
+    private static void AddSectionProperties(
+        Paragraph para,
+        BreakType splitValue,
+        bool addPageSize,
+        SectionProperties sourceSection,
+        SectionProperties portraitSection)
     {
         if (para is null) return;
 
-        // Удаляем существующие секции
         if (para.ParagraphProperties is not null)
         {
             var sections = para.ParagraphProperties.Elements<SectionProperties>().ToList();
@@ -268,65 +258,85 @@ internal static class MultiReplaceExt
         para.ParagraphProperties ??= new ParagraphProperties();
         var sectionProps = new SectionProperties();
 
-        // Добавляем PageSize
-        SectionProperties? sizeSource = addPageSize ? sourceSection : portraitSection;
-        var sourcePageSize = sizeSource?.GetFirstChild<PageSize>();
-        if (sourcePageSize is null && portraitSection is not null)
-            sourcePageSize = portraitSection.GetFirstChild<PageSize>();
-        if (sourcePageSize is null && sourceSection is not null)
-            sourcePageSize = sourceSection.GetFirstChild<PageSize>();
+        var pageSizeClone = CreatePageSizeClone(addPageSize, splitValue, sourceSection, portraitSection);
+        if (pageSizeClone is not null)
+            sectionProps.AppendChild(pageSizeClone);
 
-        if (sourcePageSize is not null)
+        var marginClone = CreateMarginClone(addPageSize, splitValue, sourceSection, portraitSection);
+        if (marginClone is not null)
+            sectionProps.AppendChild(marginClone);
+
+        sectionProps.AppendChild(new SectionType { Val = SectionMarkValues.NextPage });
+        para.ParagraphProperties.AppendChild(sectionProps);
+    }
+
+    private static PageSize? CreatePageSizeClone(
+        bool addPageSize,
+        BreakType splitValue,
+        SectionProperties sourceSection,
+        SectionProperties portraitSection)
     {
-            var pageSizeClone = (PageSize)sourcePageSize.CloneNode(true);
-            bool sourceIsLandscape = pageSizeClone.Orient?.Value == PageOrientationValues.Landscape ||
-                                     (pageSizeClone.Width?.Value > pageSizeClone.Height?.Value);
+        if (!addPageSize && splitValue != BreakType.NewLandscapeSection)
+            return null;
 
-            bool targetIsLandscape = (addPageSize && splitValue == PageBreakType.NewLandscapeSection);
+        SectionProperties? sizeSource = addPageSize ? sourceSection : portraitSection;
+        var sourcePageSize = sizeSource?.GetFirstChild<PageSize>()
+                              ?? portraitSection.GetFirstChild<PageSize>()
+                              ?? sourceSection.GetFirstChild<PageSize>();
+
+        if (sourcePageSize is null)
+            return null;
+
+        var clone = (PageSize)sourcePageSize.CloneNode(true);
+        bool sourceIsLandscape = clone.Orient?.Value == PageOrientationValues.Landscape ||
+                                 (clone.Width?.Value > clone.Height?.Value);
+
+        bool targetIsLandscape = addPageSize && splitValue == BreakType.NewLandscapeSection;
 
         if (targetIsLandscape && !sourceIsLandscape)
         {
-                pageSizeClone.SwapValues();
-                pageSizeClone.Orient = PageOrientationValues.Landscape;
+            clone.SwapValues();
+            clone.Orient = PageOrientationValues.Landscape;
         }
         else if (!targetIsLandscape && sourceIsLandscape)
         {
-                pageSizeClone.SwapValues();
-                if (addPageSize)
-                    pageSizeClone.Orient = PageOrientationValues.Portrait;
-                else
-                    pageSizeClone.Orient = null; // не задаём Orient (not set)
+            clone.SwapValues();
+            clone.Orient = addPageSize ? PageOrientationValues.Portrait : null;
         }
         else
         {
-                if (targetIsLandscape)
-                    pageSizeClone.Orient = PageOrientationValues.Landscape;
-                else if (addPageSize)
-                    pageSizeClone.Orient = PageOrientationValues.Portrait;
-                else
-                    pageSizeClone.Orient = null; // not set
-            }
-            sectionProps.AppendChild(pageSizeClone);
+            clone.Orient = targetIsLandscape ? PageOrientationValues.Landscape :
+                           addPageSize ? PageOrientationValues.Portrait : null;
         }
 
-        // Копируем PageMargin
+        return clone;
+    }
+
+    private static PageMargin? CreateMarginClone(
+        bool addPageSize,
+        BreakType splitValue,
+        SectionProperties sourceSection,
+        SectionProperties portraitSection)
+    {
         PageMargin? marginToUse = null;
+
         if (addPageSize)
         {
             var sourceMargin = sourceSection?.GetFirstChild<PageMargin>()
                                ?? portraitSection?.GetFirstChild<PageMargin>();
             if (sourceMargin is not null)
             {
-                var marginClone = (PageMargin)sourceMargin.CloneNode(true);
+                var clone = (PageMargin)sourceMargin.CloneNode(true);
                 var sourceOrient = sourceSection?.GetFirstChild<PageSize>()?.Orient;
                 bool sourceIsLandscape = sourceOrient?.Value == PageOrientationValues.Landscape ||
                                          (sourceSection?.GetFirstChild<PageSize>()?.Width?.Value > sourceSection?.GetFirstChild<PageSize>()?.Height?.Value);
-                if ((splitValue == PageBreakType.NewLandscapeSection && !sourceIsLandscape) ||
-                    (splitValue == PageBreakType.NewPortraitSection && sourceIsLandscape))
+
+                if ((splitValue == BreakType.NewLandscapeSection && !sourceIsLandscape) ||
+                    (splitValue == BreakType.NewPortraitSection && sourceIsLandscape))
                 {
-                    marginClone.SwapBottomRight();
+                    clone.SwapBottomRight();
                 }
-                marginToUse = marginClone;
+                marginToUse = clone;
             }
         }
         else
@@ -336,11 +346,54 @@ internal static class MultiReplaceExt
                 marginToUse = (PageMargin)portraitMargin.CloneNode(true);
         }
 
-        if (marginToUse is not null)
-            sectionProps.AppendChild(marginToUse);
+        return marginToUse;
+    }
 
-        sectionProps.AppendChild(new SectionType { Val = SectionMarkValues.NextPage });
-        para.ParagraphProperties.AppendChild(sectionProps);
+    private static void EnsureBodyLandscapeSection(
+        Body body,
+        SectionProperties sourceSection,
+        bool sectionChangeInsideGroup,
+        BreakType? lastOrientation)
+    {
+        if (body is null || sourceSection is null) return;
+
+        var sourcePageSize = sourceSection.GetFirstChild<PageSize>();
+        if (sourcePageSize is null) return;
+
+        bool sourceIsLandscape = sourcePageSize.Orient?.Value == PageOrientationValues.Landscape ||
+                                 (sourcePageSize.Width?.Value > sourcePageSize.Height?.Value);
+        bool lastIsPortrait = lastOrientation.HasValue && lastOrientation.Value == BreakType.NewPortraitSection;
+
+        if (!(sourceIsLandscape && sectionChangeInsideGroup && lastIsPortrait))
+            return;
+
+        foreach (var bodySec in body.Elements<SectionProperties>())
+        {
+            var ps = bodySec.GetFirstChild<PageSize>();
+            if (ps is not null && ps.Orient?.Value == PageOrientationValues.Landscape)
+                return;
+        }
+
+        var bodySection = new SectionProperties();
+        var pageSizeClone = (PageSize)sourcePageSize.CloneNode(true);
+        if (pageSizeClone.Orient?.Value != PageOrientationValues.Landscape)
+        {
+            pageSizeClone.SwapValues();
+            pageSizeClone.Orient = PageOrientationValues.Landscape;
+        }
+        bodySection.AppendChild(pageSizeClone);
+
+        var sourceMargin = sourceSection.GetFirstChild<PageMargin>();
+        if (sourceMargin is not null)
+        {
+            var marginClone = (PageMargin)sourceMargin.CloneNode(true);
+            if (sourceSection.GetFirstChild<PageSize>()?.Orient?.Value != PageOrientationValues.Landscape)
+                marginClone.SwapBottomRight();
+            bodySection.AppendChild(marginClone);
+        }
+
+        bodySection.AppendChild(new SectionType { Val = SectionMarkValues.NextPage });
+        body.AppendChild(bodySection);
     }
 
     private static void MergeParagraph(Paragraph target, Paragraph source)
@@ -349,55 +402,7 @@ internal static class MultiReplaceExt
             target.AppendChild(child.CloneNode(true));
     }
 
-    /// <summary>Выводит структуру документа: для каждого параграфа показывает текст, наличие секции, ориентацию, размеры и поля.</summary>
-    private static void LogDocumentStructure(Body body, string title)
-    {
-#if DEBUG
-        Debugger.Builder.AppendLine($"=== {title} ===");
-        var paragraphs = body.Descendants<Paragraph>().ToList();
-        int index = 0;
-        foreach (var para in paragraphs)
-        {
-            var text = para.InnerText.Replace("\n", "\\n").Replace("\r", "\\r");
-            var section = para.ParagraphProperties?.GetFirstChild<SectionProperties>();
-            string sectionInfo = "None";
-            if (section is not null)
-            {
-                var pageSize = section.GetFirstChild<PageSize>();
-                string orient = pageSize?.Orient?.ToString() ?? "not set";
-                string sizeInfo = "";
-                if (pageSize is not null)
-                {
-                    sizeInfo = $" Size: W={pageSize.Width?.Value}, H={pageSize.Height?.Value}";
-                }
-                var margins = section.GetFirstChild<PageMargin>();
-                string marginInfo = "";
-                if (margins is not null)
-                {
-                    marginInfo = $" Margins: Top={margins.Top?.Value}, Bottom={margins.Bottom?.Value}, Left={margins.Left?.Value}, Right={margins.Right?.Value}";
-                }
-                sectionInfo = $"Orient={orient}{sizeInfo}{marginInfo}";
-            }
-            Debugger.Builder.AppendLine($"  Para {index}: Text='{text}', Section={sectionInfo}");
-            index++;
-        }
-
-        // Логируем секции из Body (если есть)
-        var bodySections = body.Elements<SectionProperties>().ToList();
-        if (bodySections.Any())
-        {
-            Debugger.Builder.AppendLine("  Body SectionProperties:");
-            foreach (var sec in bodySections)
-            {
-                var ps = sec.GetFirstChild<PageSize>();
-                var pm = sec.GetFirstChild<PageMargin>();
-                Debugger.Builder.AppendLine($"    PageSize: Width={ps?.Width}, Height={ps?.Height}, Orient={ps?.Orient}");
-                Debugger.Builder.AppendLine($"    PageMargin: Top={pm?.Top}, Bottom={pm?.Bottom}, Left={pm?.Left}, Right={pm?.Right}");
-            }
-        }
-        Debugger.Builder.AppendLine($"=== END {title} ===");
-#endif
-    }
+    // ---------- ОСНОВНОЙ АЛГОРИТМ ----------
 
     /// <summary>Основной алгоритм множественной замены с поддержкой разрывов и смены ориентации.</summary>
     private static List<Paragraph>? ProcessMultiReplacements(
@@ -408,6 +413,17 @@ internal static class MultiReplaceExt
     {
         var body = original.Ancestors<Body>().FirstOrDefault();
 
+        // Определяем, есть ли пустые параграфы перед original
+        bool hasEmptyParagraphsBefore = false;
+        var prevPara = original.PreviousSibling<Paragraph>();
+        while (prevPara is not null)
+        {
+            if (!string.IsNullOrEmpty(prevPara.InnerText))
+                break;
+            hasEmptyParagraphsBefore = true;
+            prevPara = prevPara.PreviousSibling<Paragraph>();
+        }
+
         // 1. Сбор определений
         var definitions = new List<MatchDefinition>();
         if (stringReplacements is not null)
@@ -415,7 +431,7 @@ internal static class MultiReplaceExt
             foreach (var kvp in stringReplacements)
             {
                 if (string.IsNullOrEmpty(kvp.Key) || kvp.Value is null || kvp.Value.Count() == 0) continue;
-                var items = kvp.Value.Select(v => new ReplaceItem(v, PageBreakType.None));
+                var items = kvp.Value.Select(v => new ReplaceItem(v));
                 definitions.Add(new MatchDefinition(kvp.Key, items));
             }
         }
@@ -463,7 +479,6 @@ internal static class MultiReplaceExt
         }
         sourceSection ??= new SectionProperties();
 
-        // Получаем книжную секцию для копирования полей (из документа)
         SectionProperties? portraitSection = null;
         if (body is not null)
         {
@@ -476,13 +491,21 @@ internal static class MultiReplaceExt
         Paragraph? currentPara = null;
         int currentPos = 0;
         bool sectionChangeInsideGroup = false;
-        PageBreakType? lastOrientation = null;
+        BreakType? lastOrientation = null;
+
+        // Состояние обработки группы
+        bool pageBreakBeforeNext = false;
+        BreakType? pendingOrientation = null;
+        bool firstSplitMarkerHandled = false;
+        int textCount = 0;
+        Paragraph? lastTextPara = null;
+        bool emptyParagraphCreated = false;
 
         for (int i = 0; i < matches.Count; i++)
         {
             var match = matches[i];
 
-            // Текст перед совпадением (если есть)
+            // Текст перед совпадением
             if (currentPos < match.Start)
             {
                 var beforePara = CloneParagraphWithoutSection(original);
@@ -509,126 +532,124 @@ internal static class MultiReplaceExt
                 {
                     resultParas.Add(beforePara);
                     currentPara = beforePara;
+                    lastTextPara = beforePara;
                 }
             }
 
             var values = match.Definition.Values.ToList();
             if (values.Count == 0) continue;
 
-            for (int vIdx = 0; vIdx < values.Count; vIdx++)
-            {
-                var item = values[vIdx];
+            // Сбрасываем флаги для новой группы
+            pageBreakBeforeNext = false;
+            pendingOrientation = null;
+            firstSplitMarkerHandled = false;
+            textCount = 0;
+            lastTextPara = null;
+            emptyParagraphCreated = false;
 
-                // Создаём новый параграф для каждого элемента
-                var newPara = CloneParagraphWithoutSection(original);
-                resultParas.Add(newPara);
-                currentPara = newPara;
-
-                InsertFormattedRun(currentPara, item, structure, match.Start);
-
-                // Обработка смены ориентации
-                if (item.SplitValue == PageBreakType.NewLandscapeSection || item.SplitValue == PageBreakType.NewPortraitSection)
+            foreach (var item in values)
             {
-                    bool addPageSize = (vIdx != 0);
-                    PageBreakType orientation = item.SplitValue;
-                    if (vIdx != 0)
+                if (!string.IsNullOrEmpty(item.Text))
                 {
-                        orientation = PageBreakType.NewLandscapeSection;
+                    ProcessTextItem(
+                        item.Text,
+                        ref pendingOrientation,
+                        ref currentPara,
+                        ref lastTextPara,
+                        ref textCount,
+                        ref pageBreakBeforeNext,
+                        ref sectionChangeInsideGroup,
+                        ref lastOrientation,
+                        original,
+                        structure,
+                        match.Start,
+                        sourceSection,
+                        portraitSection,
+                        resultParas);
                 }
-                    AddSectionProperties(currentPara, orientation, addPageSize, sourceSection, portraitSection);
-                    lastOrientation = item.SplitValue;
-                    sectionChangeInsideGroup = true;
-                }
-                else if (item.SplitValue == PageBreakType.PageBreak)
+                else if (item.BreakValue.HasValue)
                 {
-                    var seg = structure.Segments.FirstOrDefault(s => match.Start >= s.Start && match.Start < s.End);
-                    var breakRun = new Run(new Break { Type = BreakValues.Page });
-                    if (seg is not null && seg.Run.RunProperties is not null)
-                        breakRun.RunProperties = (RunProperties)seg.Run.RunProperties.CloneNode(true);
-                    currentPara.AppendChild(breakRun);
+                    ProcessBreakItem(
+                        item.BreakValue.Value,
+                        ref pendingOrientation,
+                        ref currentPara,
+                        ref lastTextPara,
+                        ref pageBreakBeforeNext,
+                        ref firstSplitMarkerHandled,
+                        ref sectionChangeInsideGroup,
+                        ref lastOrientation,
+                        ref textCount,
+                        ref emptyParagraphCreated,
+                        hasEmptyParagraphsBefore,
+                        original,
+                        sourceSection,
+                        portraitSection,
+                        resultParas);
                 }
             }
 
-            // Закрываем секцию, если была смена и последний параграф не имеет секции
+            // Закрываем секцию, если была смена
             if (sectionChangeInsideGroup && lastOrientation.HasValue && currentPara is not null)
             {
                 if (currentPara.ParagraphProperties?.GetFirstChild<SectionProperties>() is null)
                 {
-                    bool addPageSize = (lastOrientation.Value == PageBreakType.NewLandscapeSection);
+                    bool addPageSize = (lastOrientation.Value == BreakType.NewLandscapeSection);
                     AddSectionProperties(currentPara, lastOrientation.Value, addPageSize, sourceSection, portraitSection);
                 }
             }
 
-            // Если исходная секция была landscape, внутри группы была смена, и последняя ориентация — книжная,
-            // добавляем landscape секцию в Body, чтобы остаток остался landscape.
-            if (body is not null)
+            // Если внутри группы не было смены, но есть sourceSection с PageSize,
+            // копируем её в последний параграф группы (если он не имеет секции)
+            if (!sectionChangeInsideGroup && currentPara is not null)
             {
                 var sourcePageSize = sourceSection.GetFirstChild<PageSize>();
                 if (sourcePageSize is not null)
                 {
-                    bool sourceIsLandscape = sourcePageSize.Orient?.Value == PageOrientationValues.Landscape ||
-                                             (sourcePageSize.Width?.Value > sourcePageSize.Height?.Value);
-                    bool lastIsPortrait = lastOrientation.HasValue && lastOrientation.Value == PageBreakType.NewPortraitSection;
-                    if (sourceIsLandscape && sectionChangeInsideGroup && lastIsPortrait)
+                    if (currentPara.ParagraphProperties?.GetFirstChild<SectionProperties>() is null)
                     {
-                        // Проверяем, есть ли уже секция landscape на Body
-                        bool hasBodyLandscape = false;
-                        foreach (var bodySec in body.Elements<SectionProperties>())
-                        {
-                            var ps = bodySec.GetFirstChild<PageSize>();
-                            if (ps is not null && ps.Orient?.Value == PageOrientationValues.Landscape)
-                            {
-                                hasBodyLandscape = true;
-                                break;
-                            }
-                        }
-                        if (!hasBodyLandscape)
-                        {
-                            // Создаём секцию landscape для Body
-                            var bodySection = new SectionProperties();
-                            var pageSizeClone = (PageSize)sourcePageSize.CloneNode(true);
-                            // Если ориентация не landscape, меняем
-                            if (pageSizeClone.Orient?.Value != PageOrientationValues.Landscape)
-                            {
-                                pageSizeClone.SwapValues();
-                                pageSizeClone.Orient = PageOrientationValues.Landscape;
-                            }
-                            bodySection.AppendChild(pageSizeClone);
-                            var sourceMargin = sourceSection.GetFirstChild<PageMargin>();
-                            if (sourceMargin is not null)
-                            {
-                                var marginClone = (PageMargin)sourceMargin.CloneNode(true);
-                                // Если исходная секция не landscape, но мы делаем landscape, меняем поля
-                                if (sourceSection.GetFirstChild<PageSize>()?.Orient?.Value != PageOrientationValues.Landscape)
-                                {
-                                    marginClone.SwapBottomRight();
-                                }
-                                bodySection.AppendChild(marginClone);
-                            }
-                            bodySection.AppendChild(new SectionType { Val = SectionMarkValues.NextPage });
-                            body.AppendChild(bodySection);
-                        }
+                        currentPara.ParagraphProperties ??= new ParagraphProperties();
+                        currentPara.ParagraphProperties.AppendChild(sourceSection.CloneNode(true));
                     }
                 }
             }
 
+            EnsureBodyLandscapeSection(body!, sourceSection, sectionChangeInsideGroup, lastOrientation);
+
             currentPos = match.End;
         }
 
-        // 6. Обработка остатка текста (если есть)
+        // 6. Обработка остатка текста
         if (currentPos < fullText.Length)
         {
             var remainderPara = BuildRemainderParagraph(original, structure, currentPos);
             if (remainderPara is not null)
             {
-                // Если внутри группы была смена, применяем последнюю ориентацию к остатку
-                if (sectionChangeInsideGroup && lastOrientation.HasValue)
+                // Если есть отложенная ориентация — применяем её
+                if (pendingOrientation.HasValue)
                 {
                     var breakRun = new Run(new Break { Type = BreakValues.Page });
                     remainderPara.InsertAt(breakRun, 0);
-                    bool addPageSize = (lastOrientation.Value == PageBreakType.NewLandscapeSection);
+                    bool addPageSize = (pendingOrientation.Value == BreakType.NewLandscapeSection);
+                    AddSectionProperties(remainderPara, pendingOrientation.Value, addPageSize, sourceSection, portraitSection);
+                    pendingOrientation = null;
+                }
+                else if (sectionChangeInsideGroup && lastOrientation.HasValue)
+                {
+                    var breakRun = new Run(new Break { Type = BreakValues.Page });
+                    remainderPara.InsertAt(breakRun, 0);
+                    bool addPageSize = (lastOrientation.Value == BreakType.NewLandscapeSection);
                     AddSectionProperties(remainderPara, lastOrientation.Value, addPageSize, sourceSection, portraitSection);
                 }
+                else
+                {
+                    // Если нет смены, но есть sourceSection с PageSize, копируем её в остаток
+                    var sourcePageSize = sourceSection.GetFirstChild<PageSize>();
+                    if (sourcePageSize is not null)
+                    {
+                        remainderPara.ParagraphProperties ??= new ParagraphProperties();
+                        remainderPara.ParagraphProperties.AppendChild(sourceSection.CloneNode(true));
+                    }
+                }
                 resultParas.Add(remainderPara);
             }
         }
@@ -641,12 +662,161 @@ internal static class MultiReplaceExt
                 resultParas.RemoveAt(i);
         }
 
-        // Логирование
-#if DEBUG
-        if (body is not null)
-            LogDocumentStructure(body, "FINAL DOCUMENT STRUCTURE");
-#endif
-
         return resultParas.Count > 0 ? resultParas : null;
     }
+
+    // ---------- ВСПОМОГАТЕЛЬНЫЕ МЕТОДЫ ДЛЯ ОБРАБОТКИ ГРУПП ----------
+
+    private static void ProcessTextItem(
+        string text,
+        ref BreakType? pendingOrientation,
+        ref Paragraph? currentPara,
+        ref Paragraph? lastTextPara,
+        ref int textCount,
+        ref bool pageBreakBeforeNext,
+        ref bool sectionChangeInsideGroup,
+        ref BreakType? lastOrientation,
+        Paragraph original,
+        ParagraphStructure structure,
+        int position,
+        SectionProperties sourceSection,
+        SectionProperties portraitSection,
+        List<Paragraph> resultParas)
+    {
+        if (pendingOrientation.HasValue)
+        {
+            var newPara = CloneParagraphWithoutSection(original);
+            resultParas.Add(newPara);
+            currentPara = newPara;
+
+            bool addPageSize = (pendingOrientation.Value == BreakType.NewLandscapeSection);
+            AddSectionProperties(currentPara, pendingOrientation.Value, addPageSize, sourceSection, portraitSection);
+            lastOrientation = pendingOrientation;
+            sectionChangeInsideGroup = true;
+            pendingOrientation = null;
+            textCount++;
+            lastTextPara = currentPara;
+
+            if (pageBreakBeforeNext)
+            {
+                var breakRun = new Run(new Break { Type = BreakValues.Page });
+                currentPara.InsertAt(breakRun, 0);
+                pageBreakBeforeNext = false;
+            }
+
+            InsertFormattedRun(currentPara, text, structure, position);
+        }
+        else
+        {
+            var newPara = CloneParagraphWithoutSection(original);
+            resultParas.Add(newPara);
+            currentPara = newPara;
+            textCount++;
+            lastTextPara = currentPara;
+
+            if (pageBreakBeforeNext)
+            {
+                var breakRun = new Run(new Break { Type = BreakValues.Page });
+                currentPara.InsertAt(breakRun, 0);
+                pageBreakBeforeNext = false;
+            }
+
+            InsertFormattedRun(currentPara, text, structure, position);
+        }
+    }
+
+    private static void ProcessBreakItem(
+        BreakType breakType,
+        ref BreakType? pendingOrientation,
+        ref Paragraph? currentPara,
+        ref Paragraph? lastTextPara,
+        ref bool pageBreakBeforeNext,
+        ref bool firstSplitMarkerHandled,
+        ref bool sectionChangeInsideGroup,
+        ref BreakType? lastOrientation,
+        ref int textCount,
+        ref bool emptyParagraphCreated,
+        bool hasEmptyParagraphsBefore,
+        Paragraph original,
+        SectionProperties sourceSection,
+        SectionProperties portraitSection,
+        List<Paragraph> resultParas)
+    {
+        if (breakType == BreakType.PageBreak)
+        {
+            if (currentPara is not null)
+            {
+                var breakRun = new Run(new Break { Type = BreakValues.Page });
+                var lastRun = currentPara.Descendants<Run>().LastOrDefault();
+                if (lastRun?.RunProperties is not null)
+                    breakRun.RunProperties = (RunProperties)lastRun.RunProperties.CloneNode(true);
+                currentPara.AppendChild(breakRun);
+            }
+            else
+            {
+                pageBreakBeforeNext = true;
+            }
+        }
+        else if (breakType == BreakType.NewLandscapeSection || breakType == BreakType.NewPortraitSection)
+        {
+            if (currentPara is null && hasEmptyParagraphsBefore && !firstSplitMarkerHandled)
+            {
+                var newPara = CloneParagraphWithoutSection(original);
+                resultParas.Add(newPara);
+                currentPara = newPara;
+                AddSectionProperties(currentPara, breakType, false, sourceSection, portraitSection);
+                lastOrientation = breakType;
+                sectionChangeInsideGroup = true;
+                firstSplitMarkerHandled = true;
+                emptyParagraphCreated = true;
+                pendingOrientation = null;
+                textCount = 0;
+                lastTextPara = null;
+            }
+            else if (currentPara is null && !hasEmptyParagraphsBefore && !firstSplitMarkerHandled)
+            {
+                pendingOrientation = breakType;
+                firstSplitMarkerHandled = true;
+            }
+            else if (currentPara is not null)
+            {
+                if (!firstSplitMarkerHandled)
+                {
+                    if (lastTextPara is not null)
+                    {
+                        if (lastTextPara.ParagraphProperties?.GetFirstChild<SectionProperties>() is null)
+                        {
+                            lastTextPara.ParagraphProperties ??= new ParagraphProperties();
+
+                            var sourcePageSize = sourceSection.GetFirstChild<PageSize>();
+                            if (sourcePageSize is not null)
+                            {
+                                lastTextPara.ParagraphProperties.AppendChild(sourceSection.CloneNode(true));
+                            }
+                            else
+                            {
+                                AddSectionProperties(lastTextPara, breakType, false, sourceSection, portraitSection);
+                            }
+                            lastOrientation = breakType;
+                            sectionChangeInsideGroup = true;
+                        }
+                        firstSplitMarkerHandled = true;
+                        pendingOrientation = null;
+                    }
+                    else
+                    {
+                        AddSectionProperties(currentPara, breakType, false, sourceSection, portraitSection);
+                        lastOrientation = breakType;
+                        sectionChangeInsideGroup = true;
+                        firstSplitMarkerHandled = true;
+                        pendingOrientation = null;
+                    }
+                }
+                else
+                {
+                    pendingOrientation = breakType;
+                }
+            }
+        }
+    }
 }

QWERTYkez.WordProcessor/ReplaceItem.cs

@@ -1,70 +1,39 @@
 namespace QWERTYkez.WordProcessor;
 
-/// <summary>
-/// Определяет тип разрыва или смены ориентации страницы, применяется к элементам следующим после замены
-/// </summary>
-public enum PageBreakType
+/// <summary> Определяет тип разрыва или смены ориентации страницы </summary>
+public enum BreakType
 {
-    /// <summary>Без разрыва или смены ориентации.</summary>
-    None,
-
     /// <summary>Обычный разрыв страницы (новый лист).</summary>
     PageBreak,
-
     /// <summary>Начать новую секцию с альбомной ориентацией страницы.</summary>
     NewLandscapeSection,
-
     /// <summary>Начать новую секцию с книжной ориентацией страницы.</summary>
     NewPortraitSection,
 }
 
-/// <summary>
-/// Представляет элемент замены текста, содержащий сам текст и указание
-/// на тип разрыва или смены ориентации, который должен быть применён
-/// после вставки этого текста.
-/// </summary>
-/// <remarks>
-/// Используется в методах множественной замены, например,
-/// <see cref="IWordWriter.ReplaceItem(string, IEnumerable{ReplaceItem})"/>.
-/// </remarks>
-public readonly struct ReplaceItem
+public class ReplaceItem
 {
-    /// <summary>
-    /// Инициализирует новый экземпляр <see cref="ReplaceItem"/> с пустым текстом
-    /// и типом разрыва <see cref="PageBreakType.None"/>.
-    /// </summary>
-    public ReplaceItem() { }
+    private ReplaceItem() { }
+    public ReplaceItem(string text) => _Text = text;
+    public ReplaceItem(BreakType item) => _BreakValue = item;
 
-    /// <summary>
-    /// Инициализирует новый экземпляр <see cref="ReplaceItem"/> с указанным текстом
-    /// и типом разрыва/смены ориентации.
-    /// </summary>
-    /// <param name="text">Текст, который будет вставлен вместо плейсхолдера.</param>
-    /// <param name="splitValue">
-    /// Тип разрыва или смены ориентации, который будет применён после вставки текста.
-    /// По умолчанию <see cref="PageBreakType.None"/>.
-    /// </param>
-    public ReplaceItem(string text, PageBreakType splitValue = PageBreakType.None)
+
+    public static implicit operator ReplaceItem(string text) => new(text);
+    public static implicit operator ReplaceItem(BreakType item) => item switch
         {
-        Text = text;
-        SplitValue = splitValue;
-    }
+            BreakType.PageBreak => PageBreak,
+            BreakType.NewLandscapeSection => NewLandscapeSection,
+            BreakType.NewPortraitSection => NewPortraitSection,
+            _ => throw new NotImplementedException()
+        };
 
-    /// <summary>
-    /// Получает текст, который будет вставлен вместо плейсхолдера.
-    /// </summary>
-    public string Text { get; init; } = string.Empty;
+    public static ReplaceItem PageBreak { get; } = new() { _BreakValue = BreakType.PageBreak };
+    public static ReplaceItem NewLandscapeSection { get; } = new() { _BreakValue = BreakType.NewLandscapeSection };
+    public static ReplaceItem NewPortraitSection { get; } = new() { _BreakValue = BreakType.NewPortraitSection };
 
-    /// <summary>
-    /// Получает тип разрыва или смены ориентации, который будет применён
-    /// после вставки текста.
-    /// </summary>
-    public PageBreakType SplitValue { get; init; } = PageBreakType.None;
+    public string Text => _Text;
+    public string _Text = string.Empty;
 
-    /// <summary>
-    /// Определяет явное преобразование из строки в <see cref="ReplaceItem"/>.
-    /// </summary>
-    /// <param name="text">Строка текста.</param>
-    /// <returns>Новый экземпляр <see cref="ReplaceItem"/> с указанным текстом и <see cref="PageBreakType.None"/>.</returns>
-    public static explicit operator ReplaceItem(string text) => new() { Text = text };
+    public BreakType? BreakValue => _BreakValue;
+    public BreakType? _BreakValue;
 }

QWERTYkez.WordProcessor/SimplyReplace.cs

@@ -77,7 +77,7 @@ internal static class SimplyReplaceExt
         }
     }
 
-    internal static bool SimpleReplace(this Paragraph? paragraph, string oldValue, string newValue, StringComparison comparisonType, PageBreakType splitValue = PageBreakType.None)
+    internal static bool SimpleReplace(this Paragraph? paragraph, string oldValue, string newValue, StringComparison comparisonType, BreakType? splitValue = null)
     {
         if (paragraph is null || string.IsNullOrEmpty(oldValue))
             return false;
@@ -108,7 +108,7 @@ internal static class SimplyReplaceExt
     }
 
     internal static bool SimpleReplace(this Paragraph? paragraph, string oldValue, string newValue, StringComparison comparisonType, bool breakPage)
-        => SimpleReplace(paragraph, oldValue, newValue, comparisonType, breakPage ? PageBreakType.PageBreak : PageBreakType.None);
+        => SimpleReplace(paragraph, oldValue, newValue, comparisonType, breakPage ? BreakType.PageBreak : null);
 
     internal static void Replace(this Paragraph paragraph, IEnumerable<KeyValuePair<string, string>> replacements, StringComparison comparisonType)
     {
@@ -139,7 +139,7 @@ internal static class SimplyReplaceExt
                     OldValue = kvp.Key,
                     NewValue = kvp.Value ?? string.Empty,
                     Index = pos,
-                    SplitValue = PageBreakType.None
+                    BreakValue = null
                 });
                 pos += kvp.Key.Length;
             }
@@ -159,7 +159,7 @@ internal static class SimplyReplaceExt
             var nodesToReplace = FindNodesToReplace(structure, matchIndex, matchEnd);
             if (nodesToReplace.Count > 0)
             {
-                ExecuteReplacement(nodesToReplace, matchIndex, matchEnd, replacement.NewValue, replacement.SplitValue);
+                ExecuteReplacement(nodesToReplace, matchIndex, matchEnd, replacement.NewValue, replacement.BreakValue);
             }
         }
     }
@@ -193,7 +193,7 @@ internal static class SimplyReplaceExt
                     OldValue = kvp.Key,
                     NewValue = kvp.Value.Text ?? string.Empty,
                     Index = pos,
-                    SplitValue = kvp.Value.SplitValue
+                    BreakValue = kvp.Value.BreakValue
                 });
                 pos += kvp.Key.Length;
             }
@@ -213,7 +213,7 @@ internal static class SimplyReplaceExt
             var nodesToReplace = FindNodesToReplace(structure, matchIndex, matchEnd);
             if (nodesToReplace.Count > 0)
             {
-                ExecuteReplacement(nodesToReplace, matchIndex, matchEnd, replacement.NewValue, replacement.SplitValue);
+                ExecuteReplacement(nodesToReplace, matchIndex, matchEnd, replacement.NewValue, replacement.BreakValue);
             }
         }
     }
@@ -223,7 +223,7 @@ internal static class SimplyReplaceExt
         internal string OldValue { get; set; } = null!;
         internal string NewValue { get; set; } = null!;
         internal int Index { get; set; }
-        internal PageBreakType SplitValue { get; set; } = PageBreakType.None;
+        internal BreakType? BreakValue { get; set; } = null;
     }
 
     private static ParagraphStructure AnalyzeParagraphStructure(IEnumerable<Run> runs)
@@ -287,7 +287,7 @@ internal static class SimplyReplaceExt
     int matchStart,
     int matchEnd,
     string newValue,
-    PageBreakType splitValue)
+    BreakType? splitValue)
     {
         if (nodesToReplace.Count == 0) return;
 
@@ -312,7 +312,7 @@ internal static class SimplyReplaceExt
             nodesToReplace[i].Text.Text = string.Empty;
         }
 
-        if (splitValue == PageBreakType.PageBreak)
+        if (splitValue == BreakType.PageBreak)
         {
             if (nodesToReplace[0].Text.Parent is Run run && run.Parent is Paragraph para)
             {
@@ -322,7 +322,7 @@ internal static class SimplyReplaceExt
                 para.AppendChild(breakRun);
             }
         }
-        else if (splitValue == PageBreakType.NewLandscapeSection || splitValue == PageBreakType.NewPortraitSection)
+        else if (splitValue == BreakType.NewLandscapeSection || splitValue == BreakType.NewPortraitSection)
         {
             var firstText = nodesToReplace[0].Text;
             if (firstText.Parent is Run run && run.Parent is Paragraph para)
@@ -332,10 +332,10 @@ internal static class SimplyReplaceExt
         }
     }
 
-    private static void AddSectionProperties(Paragraph para, PageBreakType splitValue)
+    private static void AddSectionProperties(Paragraph para, BreakType? splitValue)
     {
         if (para is null) return;
-        PageOrientationValues orientation = splitValue == PageBreakType.NewLandscapeSection
+        PageOrientationValues orientation = splitValue == BreakType.NewLandscapeSection
             ? PageOrientationValues.Landscape
             : PageOrientationValues.Portrait;