Backport: Add a DefaultLexer class which lexers can subclass if they want reasonable

default implementations of the ILexerWithSubStyles interface methods.

Backport of changeset 6326:d18622e37a3e.

1 files changed, 49 insertions, 0 deletions

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