2 files changed, 159 insertions, 0 deletions
diff --git a/lexlib/DefaultLexer.cxx b/lexlib/DefaultLexer.cxx
new file mode 100644
index 000000000..9babbf7a4
--- /dev/null
+++ b/lexlib/DefaultLexer.cxx
@@ -0,0 +1,110 @@
+// Scintilla source code edit control
+/** @file DefaultLexer.cxx
+ ** A lexer base class that provides reasonable default behaviour.
+ **/
+// Copyright 2017 by Neil Hodgson <neilh@scintilla.org>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#include <cstdlib>
+#include <cassert>
+#include <cstring>
+
+#include "ILexer.h"
+#include "Scintilla.h"
+#include "SciLexer.h"
+
+#include "PropSetSimple.h"
+#include "WordList.h"
+#include "LexAccessor.h"
+#include "Accessor.h"
+#include "LexerModule.h"
+#include "DefaultLexer.h"
+
+#ifdef SCI_NAMESPACE
+using namespace Scintilla;
+#endif
+
+static const char styleSubable[] = { 0 };
+
+DefaultLexer::DefaultLexer() {
+}
+
+DefaultLexer::~DefaultLexer() {
+}
+
+void SCI_METHOD DefaultLexer::Release() {
+	delete this;
+}
+
+int SCI_METHOD DefaultLexer::Version() const {
+	return lvOriginal;
+}
+
+const char * SCI_METHOD DefaultLexer::PropertyNames() {
+	return "";
+}
+
+int SCI_METHOD DefaultLexer::PropertyType(const char *) {
+	return SC_TYPE_BOOLEAN;
+}
+
+const char * SCI_METHOD DefaultLexer::DescribeProperty(const char *) {
+	return "";
+}
+
+Sci_Position SCI_METHOD DefaultLexer::PropertySet(const char *, const char *) {
+	return -1;
+}
+
+const char * SCI_METHOD DefaultLexer::DescribeWordListSets() {
+	return "";
+}
+
+Sci_Position SCI_METHOD DefaultLexer::WordListSet(int, const char *) {
+	return -1;
+}
+
+void SCI_METHOD DefaultLexer::Fold(Sci_PositionU, Sci_Position, int, IDocument *) {
+}
+
+void * SCI_METHOD DefaultLexer::PrivateCall(int, void *) {
+	return nullptr;
+}
+
+int SCI_METHOD DefaultLexer::LineEndTypesSupported() {
+	return SC_LINE_END_TYPE_DEFAULT;
+}
+
+int SCI_METHOD DefaultLexer::AllocateSubStyles(int, int) {
+	return -1;
+}
+
+int SCI_METHOD DefaultLexer::SubStylesStart(int) {
+	return -1;
+}
+
+int SCI_METHOD DefaultLexer::SubStylesLength(int) {
+	return 0;
+}
+
+int SCI_METHOD DefaultLexer::StyleFromSubStyle(int subStyle) {
+	return subStyle;
+}
+
+int SCI_METHOD DefaultLexer::PrimaryStyleFromStyle(int style) {
+	return style;
+}
+
+void SCI_METHOD DefaultLexer::FreeSubStyles() {
+}
+
+void SCI_METHOD DefaultLexer::SetIdentifiers(int, const char *) {
+}
+
+int SCI_METHOD DefaultLexer::DistanceToSecondaryStyles() {
+	return 0;
+}
+
+const char * SCI_METHOD DefaultLexer::GetSubStyleBases() {
+	return styleSubable;
+}
diff --git a/lexlib/DefaultLexer.h b/lexlib/DefaultLexer.h
new file mode 100644
index 000000000..7b1490138
--- /dev/null
+++ b/lexlib/DefaultLexer.h
@@ -0,0 +1,49 @@
+// Scintilla source code edit control
+/** @file DefaultLexer.h
+ ** A lexer base class with default empty implementations of methods. 
+ ** For lexers that do not support all features so do not need real implementations.
+ ** Does have real implementation for style metadata.
+ **/
+// Copyright 2017 by Neil Hodgson <neilh@scintilla.org>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#ifndef DEFAULTLEXER_H
+#define DEFAULTLEXER_H
+
+#ifdef SCI_NAMESPACE
+namespace Scintilla {
+#endif
+
+// A simple lexer with no state
+class DefaultLexer : public ILexerWithSubStyles {
+public:
+	DefaultLexer();
+	virtual ~DefaultLexer();
+	void SCI_METHOD Release() override;
+	int SCI_METHOD Version() const override;
+	const char * SCI_METHOD PropertyNames() override;
+	int SCI_METHOD PropertyType(const char *name) override;
+	const char * SCI_METHOD DescribeProperty(const char *name) override;
+	Sci_Position SCI_METHOD PropertySet(const char *key, const char *val) override;
+	const char * SCI_METHOD DescribeWordListSets() override;
+	Sci_Position SCI_METHOD WordListSet(int n, const char *wl) override;
+	void SCI_METHOD Lex(Sci_PositionU startPos, Sci_Position lengthDoc, int initStyle, IDocument *pAccess) override = 0;
+	void SCI_METHOD Fold(Sci_PositionU startPos, Sci_Position lengthDoc, int initStyle, IDocument *pAccess) override;
+	void * SCI_METHOD PrivateCall(int operation, void *pointer) override;
+	int SCI_METHOD LineEndTypesSupported() override;
+	int SCI_METHOD AllocateSubStyles(int styleBase, int numberStyles) override;
+	int SCI_METHOD SubStylesStart(int styleBase) override;
+	int SCI_METHOD SubStylesLength(int styleBase) override;
+	int SCI_METHOD StyleFromSubStyle(int subStyle) override;
+	int SCI_METHOD PrimaryStyleFromStyle(int style) override;
+	void SCI_METHOD FreeSubStyles() override;
+	void SCI_METHOD SetIdentifiers(int style, const char *identifiers) override;
+	int SCI_METHOD DistanceToSecondaryStyles() override;
+	const char * SCI_METHOD GetSubStyleBases() override;
+};
+
+#ifdef SCI_NAMESPACE
+}
+#endif
+
+#endif