Initial revision

1 files changed, 203 insertions, 0 deletions

diff --git a/src/ContractionState.cxx b/src/ContractionState.cxx
new file mode 100644
index 000000000..6f41461eb
--- /dev/null
+++ b/src/ContractionState.cxx
@@ -0,0 +1,203 @@
+// Scintilla source code edit control
+// ContractionState.cxx - manages visibility of lines for folding
+// Copyright 1998-2000 by Neil Hodgson <neilh@scintilla.org>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#include "Platform.h"
+
+#include "ContractionState.h"
+
+OneLine::OneLine() {
+	displayLine = 0;
+	docLine = 0;
+	visible = true;
+	expanded = true;
+}
+
+ContractionState::ContractionState() {
+	lines = 0;
+	size = 0;
+	linesInDoc = 1;
+	linesInDisplay = 1;
+	valid = false;
+}
+
+ContractionState::~ContractionState() {
+	Clear();
+}
+
+void ContractionState::MakeValid() const {
+	if (!valid) {
+		// Could be cleverer by keeping the index of the last still valid entry 
+		// rather than invalidating all.
+		int linePrev = -1;
+		int lineDisplay = 0;
+		for (int line=0; line<linesInDoc; line++) {
+			lines[line].displayLine = lineDisplay;
+			if (lines[line].visible) {
+				lines[lineDisplay].docLine = line;
+				lineDisplay++;
+			}
+		}
+		valid = true;
+	}
+}
+
+void ContractionState::Clear() {
+	delete []lines;
+	lines = 0;
+	size = 0;
+	linesInDoc = 1;
+	linesInDisplay = 1;
+}
+
+int ContractionState::LinesInDoc() const {
+	return linesInDoc;
+}
+
+int ContractionState::LinesDisplayed() const {
+	return linesInDisplay;
+}
+
+int ContractionState::DisplayFromDoc(int lineDoc) const {
+	if (size == 0) {
+		return lineDoc;
+	}
+	MakeValid();
+	if ((lineDoc >= 0) && (lineDoc < linesInDoc)) {
+		return lines[lineDoc].displayLine;
+	}
+	return -1;
+}
+
+int ContractionState::DocFromDisplay(int lineDisplay) const {
+	if (lineDisplay <= 0)
+		return 0;
+	if (lineDisplay >= linesInDisplay)
+		return linesInDoc-1;
+	if (size == 0)
+		return lineDisplay;
+	MakeValid();
+	return lines[lineDisplay].docLine;
+}
+
+void ContractionState::Grow(int sizeNew) {
+	OneLine *linesNew = new OneLine[sizeNew];
+	if (linesNew) {
+		int i = 0;
+		for (; i < size; i++) {
+			linesNew[i] = lines[i];
+		}
+		for (; i < sizeNew; i++) {
+			linesNew[i].displayLine = i;
+		}
+		delete []lines;
+		lines = linesNew;
+		size = sizeNew;
+		valid = false;
+	} else {
+		Platform::DebugPrintf("No memory available\n");
+		// TODO: Blow up
+	}
+}
+
+void ContractionState::InsertLines(int lineDoc, int lineCount) {
+	if (size == 0) {
+		linesInDoc += lineCount;
+		linesInDisplay += lineCount;
+		return;
+	}
+	//Platform::DebugPrintf("InsertLine[%d] = %d\n", lineDoc);
+	if ((linesInDoc + 2) >= size) {
+		Grow(size + growSize);
+	}
+	linesInDoc += lineCount;
+	linesInDisplay += lineCount;
+	for (int i = linesInDoc + 1; i >= lineDoc + lineCount; i--) {
+		lines[i].visible = lines[i - lineCount].visible;
+		lines[i].expanded = lines[i - lineCount].expanded;
+	}
+	for (int d=0;d<lineCount;d++) {
+		lines[lineDoc+d].visible = true;	// Should inherit visibility from context ?
+		lines[lineDoc+d].expanded = true;
+	}
+	valid = false;
+}
+
+void ContractionState::DeleteLines(int lineDoc, int lineCount) {
+	if (size == 0) {
+		linesInDoc -= lineCount;
+		linesInDisplay -= lineCount;
+		return;
+	}
+	int delta = 0;
+	for (int d=0;d<lineCount;d++)
+		if (lines[lineDoc+d].visible)
+			delta--;
+	for (int i = lineDoc; i < linesInDoc-lineCount; i++) {
+		lines[i].visible = lines[i + lineCount].visible;
+		lines[i].expanded = lines[i + lineCount].expanded;
+	}
+	linesInDoc -= lineCount;
+	linesInDisplay += delta;
+	valid = false;
+}
+
+bool ContractionState::GetVisible(int lineDoc) const {
+	if (size == 0)
+		return true;
+	if ((lineDoc >= 0) && (lineDoc < linesInDoc)) {
+		return lines[lineDoc].visible;
+	} else {
+		return false;
+	}
+}
+
+bool ContractionState::SetVisible(int lineDocStart, int lineDocEnd, bool visible) {
+	if (size == 0) {
+		Grow(lineDocEnd + growSize);
+	}
+	// TODO: modify docLine members to mirror displayLine
+	int delta = 0;
+	// Change lineDocs
+	if ((lineDocStart <= lineDocEnd) && (lineDocStart >= 0) && (lineDocEnd < linesInDoc)) {
+		for (int line=lineDocStart; line <= lineDocEnd; line++) {
+			if (lines[line].visible != visible) {
+				delta += visible ? 1 : -1;		
+				lines[line].visible = visible;
+			}
+			lines[line].displayLine += delta;
+		}
+		if (delta != 0) {
+			for (int line=lineDocEnd+1; line <= linesInDoc; line++) {
+				lines[line].displayLine += delta;
+			}
+		}
+	}
+	linesInDisplay += delta;
+	valid = false;
+	return delta != 0;
+}
+
+bool ContractionState::GetExpanded(int lineDoc) const {
+	if (size == 0) 
+		return true;
+	if ((lineDoc >= 0) && (lineDoc < linesInDoc)) {
+		return lines[lineDoc].expanded;
+	} else {
+		return false;
+	}
+}
+
+bool ContractionState::SetExpanded(int lineDoc, bool expanded) {
+	if (size == 0) {
+		Grow(lineDoc + growSize);
+	}
+	if ((lineDoc >= 0) && (lineDoc < linesInDoc)) {
+		if (lines[lineDoc].expanded != expanded) {
+			lines[lineDoc].expanded = expanded;
+			return true;
+		}
+	}
+	return false;
+}