Made methods const where they can be and are logically const as well.

28 files changed, 135 insertions, 135 deletions

diff --git a/gtk/ScintillaGTK.cxx b/gtk/ScintillaGTK.cxx
index 77693781e..1efcac348 100644
--- a/gtk/ScintillaGTK.cxx
+++ b/gtk/ScintillaGTK.cxx
@@ -172,7 +172,7 @@ private:
 	virtual bool DragThreshold(Point ptStart, Point ptNow);
 	virtual void StartDrag();
 	int TargetAsUTF8(char *text);
-	int EncodedFromUTF8(char *utf8, char *encoded);
+	int EncodedFromUTF8(char *utf8, char *encoded) const;
 	virtual bool ValidCodePage(int codePage) const;
 public: 	// Public for scintilla_send_message
 	virtual sptr_t WndProc(unsigned int iMessage, uptr_t wParam, sptr_t lParam);
@@ -895,7 +895,7 @@ int ScintillaGTK::TargetAsUTF8(char *text) {
 
 // Translates a nul terminated UTF8 string into the document encoding.
 // Return the length of the result in bytes.
-int ScintillaGTK::EncodedFromUTF8(char *utf8, char *encoded) {
+int ScintillaGTK::EncodedFromUTF8(char *utf8, char *encoded) const {
 	int inputLength = (lengthForEncode >= 0) ? lengthForEncode : strlen(utf8);
 	if (IsUnicodeMode()) {
 		if (encoded) {
diff --git a/include/Platform.h b/include/Platform.h
index 7b8d86d7d..30c4e0337 100644
--- a/include/Platform.h
+++ b/include/Platform.h
@@ -119,19 +119,19 @@ public:
 
 	// Other automatically defined methods (assignment, copy constructor, destructor) are fine
 
-	bool operator==(PRectangle &rc) {
+	bool operator==(PRectangle &rc) const {
 		return (rc.left == left) && (rc.right == right) &&
 			(rc.top == top) && (rc.bottom == bottom);
 	}
-	bool Contains(Point pt) {
+	bool Contains(Point pt) const {
 		return (pt.x >= left) && (pt.x <= right) &&
 			(pt.y >= top) && (pt.y <= bottom);
 	}
-	bool Contains(PRectangle rc) {
+	bool Contains(PRectangle rc) const {
 		return (rc.left >= left) && (rc.right <= right) &&
 			(rc.top >= top) && (rc.bottom <= bottom);
 	}
-	bool Intersects(PRectangle other) {
+	bool Intersects(PRectangle other) const {
 		return (right > other.left) && (left < other.right) &&
 			(bottom > other.top) && (top < other.bottom);
 	}
@@ -141,9 +141,9 @@ public:
 		right += xDelta;
 		bottom += yDelta;
 	}
-	XYPOSITION Width() { return right - left; }
-	XYPOSITION Height() { return bottom - top; }
-	bool Empty() {
+	XYPOSITION Width() const { return right - left; }
+	XYPOSITION Height() const { return bottom - top; }
+	bool Empty() const {
 		return (Height() <= 0) || (Width() <= 0);
 	}
 };
@@ -199,15 +199,15 @@ public:
 		return co;
 	}
 
-	unsigned int GetRed() {
+	unsigned int GetRed() const {
 		return co & 0xff;
 	}
 
-	unsigned int GetGreen() {
+	unsigned int GetGreen() const {
 		return (co >> 8) & 0xff;
 	}
 
-	unsigned int GetBlue() {
+	unsigned int GetBlue() const {
 		return (co >> 16) & 0xff;
 	}
 };
diff --git a/lexers/LexCPP.cxx b/lexers/LexCPP.cxx
index a94132904..b3c934618 100644
--- a/lexers/LexCPP.cxx
+++ b/lexers/LexCPP.cxx
@@ -153,7 +153,7 @@ public:
 	bool IsInactive() const {
 		return state != 0;
 	}
-	bool CurrentIfTaken() {
+	bool CurrentIfTaken() const {
 		return (ifTaken & maskLevel()) != 0;
 	}
 	void StartSection(bool on) {
@@ -188,7 +188,7 @@ public:
 class PPStates {
 	std::vector<LinePPState> vlls;
 public:
-	LinePPState ForLine(int line) {
+	LinePPState ForLine(int line) const {
 		if ((line > 0) && (vlls.size() > static_cast<size_t>(line))) {
 			return vlls[line];
 		} else {
diff --git a/lexlib/Accessor.cxx b/lexlib/Accessor.cxx
index 65609598f..f67737d4d 100644
--- a/lexlib/Accessor.cxx
+++ b/lexlib/Accessor.cxx
@@ -28,7 +28,7 @@ using namespace Scintilla;
 Accessor::Accessor(IDocument *pAccess_, PropSetSimple *pprops_) : LexAccessor(pAccess_), pprops(pprops_) {
 }
 
-int Accessor::GetPropertyInt(const char *key, int defaultValue) {
+int Accessor::GetPropertyInt(const char *key, int defaultValue) const {
 	return pprops->GetInt(key, defaultValue);
 }
 
diff --git a/lexlib/Accessor.h b/lexlib/Accessor.h
index 2f28c1acd..9789f2b4a 100644
--- a/lexlib/Accessor.h
+++ b/lexlib/Accessor.h
@@ -24,7 +24,7 @@ class Accessor : public LexAccessor {
 public:
 	PropSetSimple *pprops;
 	Accessor(IDocument *pAccess_, PropSetSimple *pprops_);
-	int GetPropertyInt(const char *, int defaultValue=0);
+	int GetPropertyInt(const char *, int defaultValue=0) const;
 	int IndentAmount(int line, int *flags, PFNIsCommentLeader pfnIsCommentLeader = 0);
 };
 
diff --git a/lexlib/LexAccessor.h b/lexlib/LexAccessor.h
index 59ae11346..4223f302d 100644
--- a/lexlib/LexAccessor.h
+++ b/lexlib/LexAccessor.h
@@ -90,7 +90,7 @@ public:
 		}
 		return buf[position - startPos];
 	}
-	bool IsLeadByte(char ch) {
+	bool IsLeadByte(char ch) const {
 		return pAccess->IsDBCSLeadByte(ch);
 	}
 	EncodingType Encoding() const {
@@ -104,13 +104,13 @@ public:
 		}
 		return true;
 	}
-	char StyleAt(int position) {
+	char StyleAt(int position) const {
 		return static_cast<char>(pAccess->StyleAt(position) & mask);
 	}
-	int GetLine(int position) {
+	int GetLine(int position) const {
 		return pAccess->LineFromPosition(position);
 	}
-	int LineStart(int line) {
+	int LineStart(int line) const {
 		return pAccess->LineStart(line);
 	}
 	int LineEnd(int line) {
@@ -126,7 +126,7 @@ public:
 				return startNext - 1;
 		}
 	}
-	int LevelAt(int line) {
+	int LevelAt(int line) const {
 		return pAccess->GetLevel(line);
 	}
 	int Length() const {
@@ -140,7 +140,7 @@ public:
 			validLen = 0;
 		}
 	}
-	int GetLineState(int line) {
+	int GetLineState(int line) const {
 		return pAccess->GetLineState(line);
 	}
 	int SetLineState(int line, int state) {
diff --git a/lexlib/OptionSet.h b/lexlib/OptionSet.h
index 873ac8b6c..2935a2089 100644
--- a/lexlib/OptionSet.h
+++ b/lexlib/OptionSet.h
@@ -40,7 +40,7 @@ class OptionSet {
 		Option(plcos ps_, std::string description_) :
 			opType(SC_TYPE_STRING), ps(ps_), description(description_) {
 		}
-		bool Set(T *base, const char *val) {
+		bool Set(T *base, const char *val) const {
 			switch (opType) {
 			case SC_TYPE_BOOLEAN: {
 					bool option = atoi(val) != 0;
@@ -94,7 +94,7 @@ public:
 		nameToDef[name] = Option(ps, description);
 		AppendName(name);
 	}
-	const char *PropertyNames() {
+	const char *PropertyNames() const {
 		return names.c_str();
 	}
 	int PropertyType(const char *name) {
@@ -130,7 +130,7 @@ public:
 		}
 	}
 
-	const char *DescribeWordListSets() {
+	const char *DescribeWordListSets() const {
 		return wordLists.c_str();
 	}
 };
diff --git a/lexlib/StyleContext.h b/lexlib/StyleContext.h
index c79d42e37..319f51088 100644
--- a/lexlib/StyleContext.h
+++ b/lexlib/StyleContext.h
@@ -188,7 +188,7 @@ public:
 		styler.ColourTo(currentPos - ((currentPos > lengthDocument) ? 2 : 1), state);
 		state = state_;
 	}
-	int LengthCurrent() {
+	int LengthCurrent() const {
 		return currentPos - styler.GetStartSegment();
 	}
 	int GetRelative(int n) {
diff --git a/src/CallTip.cxx b/src/CallTip.cxx
index 8931f413d..c12a6e8eb 100644
--- a/src/CallTip.cxx
+++ b/src/CallTip.cxx
@@ -69,7 +69,7 @@ bool CallTip::IsTabCharacter(char ch) const {
 	return (tabSize > 0) && (ch == '\t');
 }
 
-int CallTip::NextTabPos(int x) {
+int CallTip::NextTabPos(int x) const {
 	if (tabSize > 0) {              // paranoia... not called unless this is true
 		x -= insetX;                // position relative to text
 		x = (x + tabSize) / tabSize;  // tab "number"
diff --git a/src/CallTip.h b/src/CallTip.h
index eafaa2f2e..840aa26ac 100644
--- a/src/CallTip.h
+++ b/src/CallTip.h
@@ -35,7 +35,7 @@ class CallTip {
 		bool highlight, bool draw);
 	int PaintContents(Surface *surfaceWindow, bool draw);
 	bool IsTabCharacter(char c) const;
-	int NextTabPos(int x);
+	int NextTabPos(int x) const;
 
 public:
 	Window wCallTip;
diff --git a/src/CellBuffer.cxx b/src/CellBuffer.cxx
index 769f72464..694260821 100644
--- a/src/CellBuffer.cxx
+++ b/src/CellBuffer.cxx
@@ -496,7 +496,7 @@ void CellBuffer::SetSavePoint() {
 	uh.SetSavePoint();
 }
 
-bool CellBuffer::IsSavePoint() {
+bool CellBuffer::IsSavePoint() const {
 	return uh.IsSavePoint();
 }
 
@@ -728,7 +728,7 @@ void CellBuffer::DeleteUndoHistory() {
 	uh.DeleteUndoHistory();
 }
 
-bool CellBuffer::CanUndo() {
+bool CellBuffer::CanUndo() const {
 	return uh.CanUndo();
 }
 
@@ -750,7 +750,7 @@ void CellBuffer::PerformUndoStep() {
 	uh.CompletedUndoStep();
 }
 
-bool CellBuffer::CanRedo() {
+bool CellBuffer::CanRedo() const {
 	return uh.CanRedo();
 }
 
diff --git a/src/CellBuffer.h b/src/CellBuffer.h
index 6fe698e13..45613bfa0 100644
--- a/src/CellBuffer.h
+++ b/src/CellBuffer.h
@@ -191,7 +191,7 @@ public:
 	/// The save point is a marker in the undo stack where the container has stated that
 	/// the buffer was saved. Undo and redo can move over the save point.
 	void SetSavePoint();
-	bool IsSavePoint();
+	bool IsSavePoint() const;
 
 	bool SetUndoCollection(bool collectUndo);
 	bool IsCollectingUndo() const;
@@ -202,11 +202,11 @@ public:
 
 	/// To perform an undo, StartUndo is called to retrieve the number of steps, then UndoStep is
 	/// called that many times. Similarly for redo.
-	bool CanUndo();
+	bool CanUndo() const;
 	int StartUndo();
 	const Action &GetUndoStep() const;
 	void PerformUndoStep();
-	bool CanRedo();
+	bool CanRedo() const;
 	int StartRedo();
 	const Action &GetRedoStep() const;
 	void PerformRedoStep();
diff --git a/src/Decoration.cxx b/src/Decoration.cxx
index 4594a3a7a..cda460a48 100644
--- a/src/Decoration.cxx
+++ b/src/Decoration.cxx
@@ -29,7 +29,7 @@ Decoration::Decoration(int indicator_) : next(0), indicator(indicator_) {
 Decoration::~Decoration() {
 }
 
-bool Decoration::Empty() {
+bool Decoration::Empty() const {
 	return (rs.Runs() == 1) && (rs.AllSameAs(0));
 }
 
@@ -159,7 +159,7 @@ void DecorationList::DeleteAnyEmpty() {
 	}
 }
 
-int DecorationList::AllOnFor(int position) {
+int DecorationList::AllOnFor(int position) const {
 	int mask = 0;
 	for (Decoration *deco=root; deco; deco = deco->next) {
 		if (deco->rs.ValueAt(position)) {
diff --git a/src/Decoration.h b/src/Decoration.h
index fedff9773..23d70c7ca 100644
--- a/src/Decoration.h
+++ b/src/Decoration.h
@@ -20,7 +20,7 @@ public:
 	Decoration(int indicator_);
 	~Decoration();
 
-	bool Empty();
+	bool Empty() const;
 };
 
 class DecorationList {
@@ -51,7 +51,7 @@ public:
 	void InsertSpace(int position, int insertLength);
 	void DeleteRange(int position, int deleteLength);
 
-	int AllOnFor(int position);
+	int AllOnFor(int position) const;
 	int ValueAt(int indicator, int position);
 	int Start(int indicator, int position);
 	int End(int indicator, int position);
diff --git a/src/Document.cxx b/src/Document.cxx
index 7911ffc58..8523a00fa 100644
--- a/src/Document.cxx
+++ b/src/Document.cxx
@@ -392,7 +392,7 @@ int Document::GetLastChild(int lineParent, int level, int lastLine) {
 	return lineMaxSubord;
 }
 
-int Document::GetFoldParent(int line) {
+int Document::GetFoldParent(int line) const {
 	int level = GetLevel(line) & SC_FOLDLEVELNUMBERMASK;
 	int lineLook = line - 1;
 	while ((lineLook > 0) && (
@@ -479,11 +479,11 @@ void Document::GetHighlightDelimiters(HighlightDelimiter &highlightDelimiter, in
 	highlightDelimiter.firstChangeableLineAfter = firstChangeableLineAfter;
 }
 
-int Document::ClampPositionIntoDocument(int pos) {
+int Document::ClampPositionIntoDocument(int pos) const {
 	return Platform::Clamp(pos, 0, Length());
 }
 
-bool Document::IsCrLf(int pos) {
+bool Document::IsCrLf(int pos) const {
 	if (pos < 0)
 		return false;
 	if (pos >= (Length() - 1))
@@ -688,7 +688,7 @@ int Document::NextPosition(int pos, int moveDir) const {
 	return pos;
 }
 
-bool Document::NextCharacter(int &pos, int moveDir) {
+bool Document::NextCharacter(int &pos, int moveDir) const {
 	// Returns true if pos changed
 	int posNext = NextPosition(pos, moveDir);
 	if (posNext == pos) {
@@ -746,7 +746,7 @@ static inline bool IsSpaceOrTab(int ch) {
 //   2) Break before punctuation
 //   3) Break after whole character
 
-int Document::SafeSegment(const char *text, int length, int lengthSegment) {
+int Document::SafeSegment(const char *text, int length, int lengthSegment) const {
 	if (length <= lengthSegment)
 		return length;
 	int lastSpaceBreak = -1;
@@ -1275,7 +1275,7 @@ bool Document::IsWhiteLine(int line) const {
 	return true;
 }
 
-int Document::ParaUp(int pos) {
+int Document::ParaUp(int pos) const {
 	int line = LineFromPosition(pos);
 	line--;
 	while (line >= 0 && IsWhiteLine(line)) { // skip empty lines
@@ -1288,7 +1288,7 @@ int Document::ParaUp(int pos) {
 	return LineStart(line);
 }
 
-int Document::ParaDown(int pos) {
+int Document::ParaDown(int pos) const {
 	int line = LineFromPosition(pos);
 	while (line < LinesTotal() && !IsWhiteLine(line)) { // skip non-empty lines
 		line++;
@@ -1302,7 +1302,7 @@ int Document::ParaDown(int pos) {
 		return LineEnd(line-1);
 }
 
-CharClassify::cc Document::WordCharClass(unsigned char ch) {
+CharClassify::cc Document::WordCharClass(unsigned char ch) const {
 	if ((SC_CP_UTF8 == dbcsCodePage) && (!UTF8IsAscii(ch)))
 		return CharClassify::ccWord;
 	return charClass.GetClass(ch);
@@ -1393,7 +1393,7 @@ int Document::NextWordEnd(int pos, int delta) {
  * Check that the character at the given position is a word or punctuation character and that
  * the previous character is of a different character class.
  */
-bool Document::IsWordStartAt(int pos) {
+bool Document::IsWordStartAt(int pos) const {
 	if (pos > 0) {
 		CharClassify::cc ccPos = WordCharClass(CharAt(pos));
 		return (ccPos == CharClassify::ccWord || ccPos == CharClassify::ccPunctuation) &&
@@ -1406,7 +1406,7 @@ bool Document::IsWordStartAt(int pos) {
  * Check that the character at the given position is a word or punctuation character and that
  * the next character is of a different character class.
  */
-bool Document::IsWordEndAt(int pos) {
+bool Document::IsWordEndAt(int pos) const {
 	if (pos < Length()) {
 		CharClassify::cc ccPrev = WordCharClass(CharAt(pos-1));
 		return (ccPrev == CharClassify::ccWord || ccPrev == CharClassify::ccPunctuation) &&
@@ -1419,7 +1419,7 @@ bool Document::IsWordEndAt(int pos) {
  * Check that the given range is has transitions between character classes at both
  * ends and where the characters on the inside are word or punctuation characters.
  */
-bool Document::IsWordAt(int start, int end) {
+bool Document::IsWordAt(int start, int end) const {
 	return IsWordStartAt(start) && IsWordEndAt(end);
 }
 
@@ -1464,7 +1464,7 @@ void CaseFolderTable::StandardASCII() {
 	}
 }
 
-bool Document::MatchesWordOptions(bool word, bool wordStart, int pos, int length) {
+bool Document::MatchesWordOptions(bool word, bool wordStart, int pos, int length) const {
 	return (!word && !wordStart) ||
 			(word && IsWordAt(pos, pos + length)) ||
 			(wordStart && IsWordStartAt(pos));
@@ -1765,7 +1765,7 @@ void SCI_METHOD Document::ChangeLexerState(int start, int end) {
 	NotifyModified(mh);
 }
 
-StyledText Document::MarginStyledText(int line) {
+StyledText Document::MarginStyledText(int line) const {
 	LineAnnotation *pla = static_cast<LineAnnotation *>(perLineData[ldMargin]);
 	return StyledText(pla->Length(line), pla->Text(line),
 		pla->MultipleStyles(line), pla->Style(line), pla->Styles(line));
@@ -1795,7 +1795,7 @@ void Document::MarginClearAll() {
 	static_cast<LineAnnotation *>(perLineData[ldMargin])->ClearAll();
 }
 
-StyledText Document::AnnotationStyledText(int line) {
+StyledText Document::AnnotationStyledText(int line) const {
 	LineAnnotation *pla = static_cast<LineAnnotation *>(perLineData[ldAnnotation]);
 	return StyledText(pla->Length(line), pla->Text(line),
 		pla->MultipleStyles(line), pla->Style(line), pla->Styles(line));
@@ -1891,7 +1891,7 @@ void Document::NotifyModified(DocModification mh) {
 	}
 }
 
-bool Document::IsWordPartSeparator(char ch) {
+bool Document::IsWordPartSeparator(char ch) const {
 	return (WordCharClass(ch) == CharClassify::ccWord) && IsPunctuation(ch);
 }
 
diff --git a/src/Document.h b/src/Document.h
index e6e225e8f..f3b49e1fe 100644
--- a/src/Document.h
+++ b/src/Document.h
@@ -128,23 +128,23 @@ public:
 		firstChangeableLineAfter = -1;
 	}
 
-	bool NeedsDrawing(int line) {
+	bool NeedsDrawing(int line) const {
 		return isEnabled && (line <= firstChangeableLineBefore || line >= firstChangeableLineAfter);
 	}
 
-	bool IsFoldBlockHighlighted(int line) {
+	bool IsFoldBlockHighlighted(int line) const {
 		return isEnabled && beginFoldBlock != -1 && beginFoldBlock <= line && line <= endFoldBlock;
 	}
 
-	bool IsHeadOfFoldBlock(int line) {
+	bool IsHeadOfFoldBlock(int line) const {
 		return beginFoldBlock == line && line < endFoldBlock;
 	}
 
-	bool IsBodyOfFoldBlock(int line) {
+	bool IsBodyOfFoldBlock(int line) const {
 		return beginFoldBlock != -1 && beginFoldBlock < line && line < endFoldBlock;
 	}
 
-	bool IsTailOfFoldBlock(int line) {
+	bool IsTailOfFoldBlock(int line) const {
 		return beginFoldBlock != -1 && beginFoldBlock < line && line == endFoldBlock;
 	}
 
@@ -204,7 +204,7 @@ public:
 		WatcherWithUserData(DocWatcher *watcher_=0, void *userData_=0) :
 			watcher(watcher_), userData(userData_) {
 		}
-		bool operator==(const WatcherWithUserData &other) {
+		bool operator==(const WatcherWithUserData &other) const {
 			return (watcher == other.watcher) && (userData == other.userData);
 		}
 	};
@@ -259,9 +259,9 @@ public:
 	virtual void Init();
 	int LineEndTypesSupported() const;
 	bool SetDBCSCodePage(int dbcsCodePage_);
-	int GetLineEndTypesAllowed() { return cb.GetLineEndTypes(); }
+	int GetLineEndTypesAllowed() const { return cb.GetLineEndTypes(); }
 	bool SetLineEndTypesAllowed(int lineEndBitSet_);
-	int GetLineEndTypesActive() { return cb.GetLineEndTypes(); }
+	int GetLineEndTypesActive() const { return cb.GetLineEndTypes(); }
 	virtual void InsertLine(int line);
 	virtual void RemoveLine(int line);
 
@@ -272,16 +272,16 @@ public:
 	void SCI_METHOD SetErrorStatus(int status);
 
 	int SCI_METHOD LineFromPosition(int pos) const;
-	int ClampPositionIntoDocument(int pos);
-	bool IsCrLf(int pos);
+	int ClampPositionIntoDocument(int pos) const;
+	bool IsCrLf(int pos) const;
 	int LenChar(int pos);
 	bool InGoodUTF8(int pos, int &start, int &end) const;
 	int MovePositionOutsideChar(int pos, int moveDir, bool checkLineEnd=true);
 	int NextPosition(int pos, int moveDir) const;
-	bool NextCharacter(int &pos, int moveDir);	// Returns true if pos changed
+	bool NextCharacter(int &pos, int moveDir) const;	// Returns true if pos changed
 	int SCI_METHOD CodePage() const;
 	bool SCI_METHOD IsDBCSLeadByte(char ch) const;
-	int SafeSegment(const char *text, int length, int lengthSegment);
+	int SafeSegment(const char *text, int length, int lengthSegment) const;
 
 	// Gateways to modifying document
 	void ModifiedAt(int pos);
@@ -292,18 +292,18 @@ public:
 	void * SCI_METHOD ConvertToDocument();
 	int Undo();
 	int Redo();
-	bool CanUndo() { return cb.CanUndo(); }
-	bool CanRedo() { return cb.CanRedo(); }
+	bool CanUndo() const { return cb.CanUndo(); }
+	bool CanRedo() const { return cb.CanRedo(); }
 	void DeleteUndoHistory() { cb.DeleteUndoHistory(); }
 	bool SetUndoCollection(bool collectUndo) {
 		return cb.SetUndoCollection(collectUndo);
 	}
-	bool IsCollectingUndo() { return cb.IsCollectingUndo(); }
+	bool IsCollectingUndo() const { return cb.IsCollectingUndo(); }
 	void BeginUndoAction() { cb.BeginUndoAction(); }
 	void EndUndoAction() { cb.EndUndoAction(); }
 	void AddUndoAction(int token, bool mayCoalesce) { cb.AddUndoAction(token, mayCoalesce); }
 	void SetSavePoint();
-	bool IsSavePoint() { return cb.IsSavePoint(); }
+	bool IsSavePoint() const { return cb.IsSavePoint(); }
 	const char * SCI_METHOD BufferPointer() { return cb.BufferPointer(); }
 	const char *RangePointer(int position, int rangeLength) { return cb.RangePointer(position, rangeLength); }
 	int GapPosition() const { return cb.GapPosition(); }
@@ -318,14 +318,14 @@ public:
 	static std::string TransformLineEnds(const char *s, size_t len, int eolModeWanted);
 	void ConvertLineEnds(int eolModeSet);
 	void SetReadOnly(bool set) { cb.SetReadOnly(set); }
-	bool IsReadOnly() { return cb.IsReadOnly(); }
+	bool IsReadOnly() const { return cb.IsReadOnly(); }
 
 	bool InsertChar(int pos, char ch);
 	bool InsertCString(int position, const char *s);
 	void DelChar(int pos);
 	void DelCharBack(int pos);
 
-	char CharAt(int position) { return cb.CharAt(position); }
+	char CharAt(int position) const { return cb.CharAt(position); }
 	void SCI_METHOD GetCharRange(char *buffer, int position, int lengthRetrieve) const {
 		cb.GetCharRange(buffer, position, lengthRetrieve);
 	}
@@ -352,7 +352,7 @@ public:
 	int SCI_METHOD GetLevel(int line) const;
 	void ClearLevels();
 	int GetLastChild(int lineParent, int level=-1, int lastLine=-1);
-	int GetFoldParent(int line);
+	int GetFoldParent(int line) const;
 	void GetHighlightDelimiters(HighlightDelimiter &hDelimiter, int line, int lastLine);
 
 	void Indent(bool forwards);
@@ -361,7 +361,7 @@ public:
 	int NextWordEnd(int pos, int delta);
 	int SCI_METHOD Length() const { return cb.Length(); }
 	void Allocate(int newSize) { cb.Allocate(newSize); }
-	bool MatchesWordOptions(bool word, bool wordStart, int pos, int length);
+	bool MatchesWordOptions(bool word, bool wordStart, int pos, int length) const;
 	bool HasCaseFolder(void) const;
 	void SetCaseFolder(CaseFolder *pcf_);
 	long FindText(int minPos, int maxPos, const char *search, bool caseSensitive, bool word,
@@ -376,10 +376,10 @@ public:
 	void SCI_METHOD StartStyling(int position, char mask);
 	bool SCI_METHOD SetStyleFor(int length, char style);
 	bool SCI_METHOD SetStyles(int length, const char *styles);
-	int GetEndStyled() { return endStyled; }
+	int GetEndStyled() const { return endStyled; }
 	void EnsureStyledTo(int pos);
 	void LexerChanged();
-	int GetStyleClock() { return styleClock; }
+	int GetStyleClock() const { return styleClock; }
 	void IncrementStyleClock();
 	void SCI_METHOD DecorationSetCurrentIndicator(int indicator) {
 		decorations.SetCurrentIndicator(indicator);
@@ -391,13 +391,13 @@ public:
 	int GetMaxLineState();
 	void SCI_METHOD ChangeLexerState(int start, int end);
 
-	StyledText MarginStyledText(int line);
+	StyledText MarginStyledText(int line) const;
 	void MarginSetStyle(int line, int style);
 	void MarginSetStyles(int line, const unsigned char *styles);
 	void MarginSetText(int line, const char *text);
 	void MarginClearAll();
 
-	StyledText AnnotationStyledText(int line);
+	StyledText AnnotationStyledText(int line) const;
 	void AnnotationSetText(int line, const char *text);
 	void AnnotationSetStyle(int line, int style);
 	void AnnotationSetStyles(int line, const unsigned char *styles);
@@ -407,21 +407,21 @@ public:
 	bool AddWatcher(DocWatcher *watcher, void *userData);
 	bool RemoveWatcher(DocWatcher *watcher, void *userData);
 
-	CharClassify::cc WordCharClass(unsigned char ch);
-	bool IsWordPartSeparator(char ch);
+	CharClassify::cc WordCharClass(unsigned char ch) const;
+	bool IsWordPartSeparator(char ch) const;
 	int WordPartLeft(int pos);
 	int WordPartRight(int pos);
 	int ExtendStyleRange(int pos, int delta, bool singleLine = false);
 	bool IsWhiteLine(int line) const;
-	int ParaUp(int pos);
-	int ParaDown(int pos);
-	int IndentSize() { return actualIndentInChars; }
+	int ParaUp(int pos) const;
+	int ParaDown(int pos) const;
+	int IndentSize() const { return actualIndentInChars; }
 	int BraceMatch(int position, int maxReStyle);
 
 private:
-	bool IsWordStartAt(int pos);
-	bool IsWordEndAt(int pos);
-	bool IsWordAt(int start, int end);
+	bool IsWordStartAt(int pos) const;
+	bool IsWordEndAt(int pos) const;
+	bool IsWordAt(int start, int end) const;
 
 	void NotifyModifyAttempt();
 	void NotifySavePoint(bool atSavePoint);
diff --git a/src/Editor.cxx b/src/Editor.cxx
index 65348f588..6d833c5d2 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -333,7 +333,7 @@ Point Editor::DocumentPointFromView(Point ptView) {
 	return ptDocument;
 }
 
-int Editor::TopLineOfMain() {
+int Editor::TopLineOfMain() const {
 	if (wMargin.GetID())
 		return 0;
 	else
@@ -489,7 +489,7 @@ int Editor::XFromPosition(SelectionPosition sp) {
 	return pt.x - vs.textStart + xOffset;
 }
 
-int Editor::LineFromLocation(Point pt) {
+int Editor::LineFromLocation(Point pt) const {
 	return cs.DocFromDisplay(pt.y / vs.lineHeight + topLine);
 }
 
@@ -722,11 +722,11 @@ void Editor::InvalidateRange(int start, int end) {
 	RedrawRect(RectangleFromRange(start, end));
 }
 
-int Editor::CurrentPosition() {
+int Editor::CurrentPosition() const {
 	return sel.MainCaret();
 }
 
-bool Editor::SelectionEmpty() {
+bool Editor::SelectionEmpty() const {
 	return sel.Empty();
 }
 
@@ -1740,7 +1740,7 @@ void Editor::LinesSplit(int pixelWidth) {
 	}
 }
 
-int Editor::SubstituteMarkerIfEmpty(int markerCheck, int markerDefault) {
+int Editor::SubstituteMarkerIfEmpty(int markerCheck, int markerDefault) const {
 	if (vs.markers[markerCheck].markType == SC_MARK_EMPTY)
 		return markerDefault;
 	return markerCheck;
@@ -2426,14 +2426,14 @@ void Editor::LayoutLine(int line, Surface *surface, ViewStyle &vstyle, LineLayou
 	}
 }
 
-ColourDesired Editor::SelectionBackground(ViewStyle &vsDraw, bool main) {
+ColourDesired Editor::SelectionBackground(ViewStyle &vsDraw, bool main) const {
 	return main ?
 		(primarySelection ? vsDraw.selbackground : vsDraw.selbackground2) :
 		vsDraw.selAdditionalBackground;
 }
 
 ColourDesired Editor::TextBackground(ViewStyle &vsDraw, bool overrideBackground,
-        ColourDesired background, int inSelection, bool inHotspot, int styleMain, int i, LineLayout *ll) {
+        ColourDesired background, int inSelection, bool inHotspot, int styleMain, int i, LineLayout *ll) const {
 	if (inSelection == 1) {
 		if (vsDraw.selbackset && (vsDraw.selAlpha == SC_ALPHA_NOALPHA)) {
 			return SelectionBackground(vsDraw, true);
@@ -6217,7 +6217,7 @@ bool Editor::PointInSelMargin(Point pt) {
 	}
 }
 
-Window::Cursor Editor::GetMarginCursor(Point pt) {
+Window::Cursor Editor::GetMarginCursor(Point pt) const {
 	int x = 0;
 	for (int margin = 0; margin <= SC_MAX_MARGIN; margin++) {
 		if ((pt.x >= x) && (pt.x < x + vs.ms[margin].width))
@@ -6483,7 +6483,7 @@ void Editor::ButtonDown(Point pt, unsigned int curTime, bool shift, bool ctrl, b
 	ShowCaretAtCurrentPosition();
 }
 
-bool Editor::PositionIsHotspot(int position) {
+bool Editor::PositionIsHotspot(int position) const {
 	return vs.styles[pdoc->StyleAt(position) & pdoc->stylingBitsMask].hotspot;
 }
 
@@ -6527,7 +6527,7 @@ void Editor::SetHotSpotRange(Point *pt) {
 	}
 }
 
-void Editor::GetHotSpotRange(int &hsStart_, int &hsEnd_) {
+void Editor::GetHotSpotRange(int &hsStart_, int &hsEnd_) const {
 	hsStart_ = hsStart;
 	hsEnd_ = hsEnd;
 }
@@ -6787,7 +6787,7 @@ void Editor::SetFocusState(bool focusState) {
 	}
 }
 
-int Editor::PositionAfterArea(PRectangle rcArea) {
+int Editor::PositionAfterArea(PRectangle rcArea) const {
 	// The start of the document line after the display line after the area
 	// This often means that the line after a modification is restyled which helps
 	// detect multiline comment additions and heals single line comments
@@ -7046,7 +7046,7 @@ void Editor::FoldExpand(int line, int action, int level) {
 	Redraw();
 }
 
-int Editor::ContractedFoldNext(int lineStart) {
+int Editor::ContractedFoldNext(int lineStart) const {
 	for (int line = lineStart; line<pdoc->LinesTotal();) {
 		if (!cs.GetExpanded(line) && (pdoc->GetLevel(line) & SC_FOLDLEVELHEADERFLAG))
 			return line;
diff --git a/src/Editor.h b/src/Editor.h
index 328bed8d0..3888d2b87 100644
--- a/src/Editor.h
+++ b/src/Editor.h
@@ -308,7 +308,7 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	// scroll views where it will be equivalent to the current scroll position.
 	virtual Point GetVisibleOriginInMain();
 	Point DocumentPointFromView(Point ptView);  // Convert a point from view space to document
-	int TopLineOfMain();   // Return the line at Main's y coordinate 0
+	int TopLineOfMain() const;   // Return the line at Main's y coordinate 0
 	virtual PRectangle GetClientRectangle();
 	PRectangle GetTextRectangle();
 
@@ -324,7 +324,7 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	int PositionFromLocation(Point pt, bool canReturnInvalid=false, bool charPosition=false);
 	SelectionPosition SPositionFromLineX(int lineDoc, int x);
 	int PositionFromLineX(int line, int x);
-	int LineFromLocation(Point pt);
+	int LineFromLocation(Point pt) const;
 	void SetTopLine(int topLineNew);
 
 	bool AbandonPaint();
@@ -337,8 +337,8 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	bool UserVirtualSpace() const {
 		return ((virtualSpaceOptions & SCVS_USERACCESSIBLE) != 0);
 	}
-	int CurrentPosition();
-	bool SelectionEmpty();
+	int CurrentPosition() const;
+	bool SelectionEmpty() const;
 	SelectionPosition SelectionStart();
 	SelectionPosition SelectionEnd();
 	void SetRectangularRange();
@@ -399,13 +399,13 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	void LinesJoin();
 	void LinesSplit(int pixelWidth);
 
-	int SubstituteMarkerIfEmpty(int markerCheck, int markerDefault);
+	int SubstituteMarkerIfEmpty(int markerCheck, int markerDefault) const;
 	void PaintSelMargin(Surface *surface, PRectangle &rc);
 	LineLayout *RetrieveLineLayout(int lineNumber);
 	void LayoutLine(int line, Surface *surface, ViewStyle &vstyle, LineLayout *ll,
 		int width=LineLayout::wrapWidthInfinite);
-	ColourDesired SelectionBackground(ViewStyle &vsDraw, bool main);
-	ColourDesired TextBackground(ViewStyle &vsDraw, bool overrideBackground, ColourDesired background, int inSelection, bool inHotspot, int styleMain, int i, LineLayout *ll);
+	ColourDesired SelectionBackground(ViewStyle &vsDraw, bool main) const;
+	ColourDesired TextBackground(ViewStyle &vsDraw, bool overrideBackground, ColourDesired background, int inSelection, bool inHotspot, int styleMain, int i, LineLayout *ll) const;
 	void DrawIndentGuide(Surface *surface, int lineVisible, int lineHeight, int start, PRectangle rcSegment, bool highlight);
 	void DrawWrapMarker(Surface *surface, PRectangle rcPlace, bool isEndMarker, ColourDesired wrapColour);
 	void DrawEOL(Surface *surface, ViewStyle &vsDraw, PRectangle rcLine, LineLayout *ll,
@@ -529,7 +529,7 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	bool PositionInSelection(int pos);
 	bool PointInSelection(Point pt);
 	bool PointInSelMargin(Point pt);
-	Window::Cursor GetMarginCursor(Point pt);
+	Window::Cursor GetMarginCursor(Point pt) const;
 	void TrimAndSetSelection(int currentPos_, int anchor_);
 	void LineSelection(int lineCurrentPos_, int lineAnchorPos_, bool wholeLine);
 	void WordSelection(int pos);
@@ -547,7 +547,7 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	virtual bool HaveMouseCapture() = 0;
 	void SetFocusState(bool focusState);
 
-	int PositionAfterArea(PRectangle rcArea);
+	int PositionAfterArea(PRectangle rcArea) const;
 	void StyleToPositionInView(Position pos);
 	virtual void IdleWork();
 	virtual void QueueIdleWork(WorkNeeded::workItems items, int upTo=0);
@@ -566,7 +566,7 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	void SetFoldExpanded(int lineDoc, bool expanded);
 	void FoldLine(int line, int action);
 	void FoldExpand(int line, int action, int level);
-	int ContractedFoldNext(int lineStart);
+	int ContractedFoldNext(int lineStart) const;
 	void EnsureLineVisible(int lineDoc, bool enforcePolicy);
 	void FoldChanged(int line, int levelNow, int levelPrev);
 	void NeedShown(int pos, int len);
@@ -575,10 +575,10 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	int GetTag(char *tagValue, int tagNumber);
 	int ReplaceTarget(bool replacePatterns, const char *text, int length=-1);
 
-	bool PositionIsHotspot(int position);
+	bool PositionIsHotspot(int position) const;
 	bool PointIsHotspot(Point pt);
 	void SetHotSpotRange(Point *pt);
-	void GetHotSpotRange(int &hsStart, int &hsEnd);
+	void GetHotSpotRange(int &hsStart, int &hsEnd) const;
 
 	int CodePage() const;
 	virtual bool ValidCodePage(int /* codePage */) const { return true; }
diff --git a/src/KeyMap.cxx b/src/KeyMap.cxx
index ab8be2f9e..740776104 100644
--- a/src/KeyMap.cxx
+++ b/src/KeyMap.cxx
@@ -49,7 +49,7 @@ void KeyMap::AssignCmdKey(int key, int modifiers, unsigned int msg) {
 	kmap.push_back(ktc);
 }
 
-unsigned int KeyMap::Find(int key, int modifiers) {
+unsigned int KeyMap::Find(int key, int modifiers) const {
 	for (size_t i = 0; i < kmap.size(); i++) {
 		if ((key == kmap[i].key) && (modifiers == kmap[i].modifiers)) {
 			return kmap[i].msg;
diff --git a/src/KeyMap.h b/src/KeyMap.h
index ee4d29ce2..3fbbeab69 100644
--- a/src/KeyMap.h
+++ b/src/KeyMap.h
@@ -40,7 +40,7 @@ public:
 	~KeyMap();
 	void Clear();
 	void AssignCmdKey(int key, int modifiers, unsigned int msg);
-	unsigned int Find(int key, int modifiers);	// 0 returned on failure
+	unsigned int Find(int key, int modifiers) const;	// 0 returned on failure
 };
 
 #ifdef SCI_NAMESPACE
diff --git a/src/PerLine.cxx b/src/PerLine.cxx
index 7e25e4823..a066bd647 100644
--- a/src/PerLine.cxx
+++ b/src/PerLine.cxx
@@ -282,7 +282,7 @@ int LineLevels::SetLevel(int line, int level, int lines) {
 	return prev;
 }
 
-int LineLevels::GetLevel(int line) {
+int LineLevels::GetLevel(int line) const {
 	if (levels.Length() && (line >= 0) && (line < levels.Length())) {
 		return levels[line];
 	} else {
@@ -325,7 +325,7 @@ int LineState::GetLineState(int line) {
 	return lineStates[line];
 }
 
-int LineState::GetMaxLineState() {
+int LineState::GetMaxLineState() const {
 	return lineStates.Length();
 }
 
@@ -383,7 +383,7 @@ bool LineAnnotation::MultipleStyles(int line) const {
 		return 0;
 }
 
-int LineAnnotation::Style(int line) {
+int LineAnnotation::Style(int line) const {
 	if (annotations.Length() && (line >= 0) && (line < annotations.Length()) && annotations[line])
 		return reinterpret_cast<AnnotationHeader *>(annotations[line])->style;
 	else
diff --git a/src/PerLine.h b/src/PerLine.h
index 646924ee0..70d0023e4 100644
--- a/src/PerLine.h
+++ b/src/PerLine.h
@@ -72,7 +72,7 @@ public:
 	void ExpandLevels(int sizeNew=-1);
 	void ClearLevels();
 	int SetLevel(int line, int level, int lines);
-	int GetLevel(int line);
+	int GetLevel(int line) const;
 };
 
 class LineState : public PerLine {
@@ -87,7 +87,7 @@ public:
 
 	int SetLineState(int line, int state);
 	int GetLineState(int line);
-	int GetMaxLineState();
+	int GetMaxLineState() const;
 };
 
 class LineAnnotation : public PerLine {
@@ -101,7 +101,7 @@ public:
 	virtual void RemoveLine(int line);
 
 	bool MultipleStyles(int line) const;
-	int Style(int line);
+	int Style(int line) const;
 	const char *Text(int line) const;
 	const unsigned char *Styles(int line) const;
 	void SetText(int line, const char *text);
diff --git a/src/RESearch.h b/src/RESearch.h
index 1f30ffb6d..702259d52 100644
--- a/src/RESearch.h
+++ b/src/RESearch.h
@@ -61,7 +61,7 @@ private:
 	unsigned char bittab[BITBLK]; /* bit table for CCL pre-set bits */
 	int failure;
 	CharClassify *charClass;
-	bool iswordc(unsigned char x) {
+	bool iswordc(unsigned char x) const {
 		return charClass->IsWord(x);
 	}
 };
diff --git a/src/RunStyles.cxx b/src/RunStyles.cxx
index 82d924a23..fdcfc2b96 100644
--- a/src/RunStyles.cxx
+++ b/src/RunStyles.cxx
@@ -87,7 +87,7 @@ int RunStyles::ValueAt(int position) const {
 	return styles->ValueAt(starts->PartitionFromPosition(position));
 }
 
-int RunStyles::FindNextChange(int position, int end) {
+int RunStyles::FindNextChange(int position, int end) const {
 	int run = starts->PartitionFromPosition(position);
 	if (run < starts->Partitions()) {
 		int runChange = starts->PositionFromPartition(run);
@@ -106,11 +106,11 @@ int RunStyles::FindNextChange(int position, int end) {
 	}
 }
 
-int RunStyles::StartRun(int position) {
+int RunStyles::StartRun(int position) const {
 	return starts->PositionFromPartition(starts->PartitionFromPosition(position));
 }
 
-int RunStyles::EndRun(int position) {
+int RunStyles::EndRun(int position) const {
 	return starts->PositionFromPartition(starts->PartitionFromPosition(position) + 1);
 }
 
@@ -258,7 +258,7 @@ int RunStyles::Find(int value, int start) const {
 	return -1;
 }
 
-void RunStyles::Check() {
+void RunStyles::Check() const {
 	if (Length() < 0) {
 		throw std::runtime_error("RunStyles: Length can not be negative.");
 	}
diff --git a/src/RunStyles.h b/src/RunStyles.h
index 521c701fa..b096ad800 100644
--- a/src/RunStyles.h
+++ b/src/RunStyles.h
@@ -30,9 +30,9 @@ public:
 	~RunStyles();
 	int Length() const;
 	int ValueAt(int position) const;
-	int FindNextChange(int position, int end);
-	int StartRun(int position);
-	int EndRun(int position);
+	int FindNextChange(int position, int end) const;
+	int StartRun(int position) const;
+	int EndRun(int position) const;
 	// Returns true if some values may have changed
 	bool FillRange(int &position, int value, int &fillLength);
 	void SetValueAt(int position, int value);
@@ -44,7 +44,7 @@ public:
 	bool AllSameAs(int value) const;
 	int Find(int value, int start) const;
 
-	void Check();
+	void Check() const;
 };
 
 #ifdef SCI_NAMESPACE
diff --git a/src/ScintillaBase.cxx b/src/ScintillaBase.cxx
index 64411ed1a..31db93eca 100644
--- a/src/ScintillaBase.cxx
+++ b/src/ScintillaBase.cxx
@@ -367,13 +367,13 @@ void ScintillaBase::AutoCompleteCompleted() {
 	SetLastXChosen();
 }
 
-int ScintillaBase::AutoCompleteGetCurrent() {
+int ScintillaBase::AutoCompleteGetCurrent() const {
 	if (!ac.Active())
 		return -1;
 	return ac.GetSelection();
 }
 
-int ScintillaBase::AutoCompleteGetCurrentText(char *buffer) {
+int ScintillaBase::AutoCompleteGetCurrentText(char *buffer) const {
 	if (ac.Active()) {
 		int item = ac.GetSelection();
 		if (item != -1) {
diff --git a/src/ScintillaBase.h b/src/ScintillaBase.h
index bbd7f8fdf..95761390d 100644
--- a/src/ScintillaBase.h
+++ b/src/ScintillaBase.h
@@ -68,8 +68,8 @@ protected:
 	void AutoCompleteStart(int lenEntered, const char *list);
 	void AutoCompleteCancel();
 	void AutoCompleteMove(int delta);
-	int AutoCompleteGetCurrent();
-	int AutoCompleteGetCurrentText(char *buffer);
+	int AutoCompleteGetCurrent() const;
+	int AutoCompleteGetCurrentText(char *buffer) const;
 	void AutoCompleteCharacterAdded(char ch);
 	void AutoCompleteCharacterDeleted();
 	void AutoCompleteCompleted();
diff --git a/win32/ScintillaWin.cxx b/win32/ScintillaWin.cxx
index 94d676a4f..3bdc4a1cc 100644
--- a/win32/ScintillaWin.cxx
+++ b/win32/ScintillaWin.cxx
@@ -276,7 +276,7 @@ class ScintillaWin :
 	void FullPaint();
 	void FullPaintDC(HDC dc);
 	bool IsCompatibleDC(HDC dc);
-	DWORD EffectFromState(DWORD grfKeyState);
+	DWORD EffectFromState(DWORD grfKeyState) const;
 
 	virtual int SetScrollInfo(int nBar, LPCSCROLLINFO lpsi, BOOL bRedraw);
 	virtual bool GetScrollInfo(int nBar, LPSCROLLINFO lpsi);
@@ -310,13 +310,13 @@ public:
 	friend class DropSource;
 	friend class DataObject;
 	friend class DropTarget;
-	bool DragIsRectangularOK(CLIPFORMAT fmt) {
+	bool DragIsRectangularOK(CLIPFORMAT fmt) const {
 		return drag.rectangular && (fmt == cfColumnSelect);
 	}
 
 private:
 	// For use in creating a system caret
-	bool HasCaretSizeChanged();
+	bool HasCaretSizeChanged() const;
 	BOOL CreateSystemCaret();
 	BOOL DestroySystemCaret();
 	HBITMAP sysCaretBitmap;
@@ -2457,7 +2457,7 @@ bool ScintillaWin::IsCompatibleDC(HDC hOtherDC) {
 	return isCompatible;
 }
 
-DWORD ScintillaWin::EffectFromState(DWORD grfKeyState) {
+DWORD ScintillaWin::EffectFromState(DWORD grfKeyState) const {
 	// These are the Wordpad semantics.
 	DWORD dwEffect;
 	if (inDragDrop == ddDragging)	// Internal defaults to move
@@ -2739,7 +2739,7 @@ bool ScintillaWin::Unregister() {
 	return result;
 }
 
-bool ScintillaWin::HasCaretSizeChanged() {
+bool ScintillaWin::HasCaretSizeChanged() const {
 	if (
 		( (0 != vs.caretWidth) && (sysCaretWidth != vs.caretWidth) )
 		|| ((0 != vs.lineHeight) && (sysCaretHeight != vs.lineHeight))