Feature [feature-requests:#1381] Move SplitView to header so it can be used more

widely.
Ensure that case where all text is after the gap is as efficient as when all
text is before the gap.

1 files changed, 29 insertions, 0 deletions

diff --git a/src/CellBuffer.h b/src/CellBuffer.h
index 361c285ad..637d0a6b5 100644
--- a/src/CellBuffer.h
+++ b/src/CellBuffer.h
@@ -102,6 +102,34 @@ public:
 	void CompletedRedoStep();
 };
 
+struct SplitView {
+	const char *segment1 = nullptr;
+	size_t length1 = 0;
+	const char *segment2 = nullptr;
+	size_t length = 0;
+
+	SplitView() = default;
+
+	bool operator==(const SplitView &other) const noexcept {
+		return segment1 == other.segment1 && length1 == other.length1 &&
+			segment2 == other.segment2 && length == other.length;
+	}
+	bool operator!=(const SplitView &other) const noexcept {
+		return !(*this == other);
+	}
+
+	char CharAt(size_t position) const noexcept {
+		if (position < length1) {
+			return segment1[position];
+		}
+		if (position < length) {
+			return segment2[position];
+		}
+		return 0;
+	}
+};
+
+
 /**
  * Holder for an expandable array of characters that supports undo and line markers.
  * Based on article "Data Structures in a Bit-Mapped Text Editor"
@@ -150,6 +178,7 @@ public:
 	const char *BufferPointer();
 	const char *RangePointer(Sci::Position position, Sci::Position rangeLength) noexcept;
 	Sci::Position GapPosition() const noexcept;
+	SplitView AllView() const noexcept;
 
 	Sci::Position Length() const noexcept;
 	void Allocate(Sci::Position newSize);