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124 lines
3.9 KiB
124 lines
3.9 KiB
// A simple lexer
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/** @file SimpleLexer.cxx
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** A lexer that follows the Lexilla protocol to allow it to be used from Lexilla clients like SciTE.
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** The lexer applies alternating styles (0,1) to bytes of the text.
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**/
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// Copyright 2021 by Neil Hodgson <neilh@scintilla.org>
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// This file is in the public domain.
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// If the public domain is not possible in your location then it can also be used under the same
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// license as Scintilla. https://www.scintilla.org/License.txt
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// Windows/MSVC
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// cl -std:c++17 -EHsc -LD -I ../../../scintilla/include -I ../../include -I ../../lexlib SimpleLexer.cxx ../../lexlib/*.cxx
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// macOS/clang
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// clang++ -dynamiclib --std=c++17 -I ../../../scintilla/include -I ../../include -I ../../lexlib SimpleLexer.cxx ../../lexlib/*.cxx -o SimpleLexer.dylib
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// Linux/g++
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// g++ -fPIC -shared --std=c++17 -I ../../../scintilla/include -I ../../include -I ../../lexlib SimpleLexer.cxx ../../lexlib/*.cxx -o SimpleLexer.so
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/* It can be demonstrated in SciTE like this, substituting the actual shared library location as lexilla.path:
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lexilla.path=.;C:\u\hg\lexilla\examples\SimpleLexer\SimpleLexer.dll
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lexer.*.xx=simple
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style.simple.1=fore:#FF0000
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <string_view>
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#include "ILexer.h"
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#include "Scintilla.h"
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#include "SciLexer.h"
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// Lexilla.h should not be included here as it declares statically linked functions without the __declspec( dllexport )
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#include "WordList.h"
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#include "PropSetSimple.h"
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#include "LexAccessor.h"
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#include "Accessor.h"
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#include "StyleContext.h"
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#include "CharacterSet.h"
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#include "LexerModule.h"
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#include "LexerBase.h"
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using namespace Scintilla;
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using namespace Lexilla;
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class LexerSimple : public LexerBase {
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public:
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LexerSimple() {
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}
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void SCI_METHOD Lex(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) override {
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try {
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Accessor astyler(pAccess, &props);
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if (length > 0) {
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astyler.StartAt(startPos);
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astyler.StartSegment(startPos);
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for (unsigned int k=0; k<length; k++) {
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astyler.ColourTo(startPos+k, (startPos+k)%2);
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}
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}
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astyler.Flush();
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} catch (...) {
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// Should not throw into caller as may be compiled with different compiler or options
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pAccess->SetErrorStatus(SC_STATUS_FAILURE);
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}
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}
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void SCI_METHOD Fold(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) override {
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}
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static ILexer5 *LexerFactorySimple() {
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try {
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return new LexerSimple();
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} catch (...) {
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// Should not throw into caller as may be compiled with different compiler or options
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return nullptr;
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}
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}
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};
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#if defined(_WIN32)
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#define EXPORT_FUNCTION __declspec(dllexport)
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#define CALLING_CONVENTION __stdcall
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#else
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#define EXPORT_FUNCTION __attribute__((visibility("default")))
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#define CALLING_CONVENTION
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#endif
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static const char *lexerName = "simple";
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extern "C" {
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EXPORT_FUNCTION int CALLING_CONVENTION GetLexerCount() {
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return 1;
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}
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EXPORT_FUNCTION void CALLING_CONVENTION GetLexerName(unsigned int index, char *name, int buflength) {
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*name = 0;
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if ((index == 0) && (buflength > static_cast<int>(strlen(lexerName)))) {
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strcpy(name, lexerName);
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}
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}
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EXPORT_FUNCTION LexerFactoryFunction CALLING_CONVENTION GetLexerFactory(unsigned int index) {
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if (index == 0)
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return LexerSimple::LexerFactorySimple;
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else
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return 0;
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}
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EXPORT_FUNCTION Scintilla::ILexer5* CALLING_CONVENTION CreateLexer(const char *name) {
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if (0 == strcmp(name, lexerName)) {
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return LexerSimple::LexerFactorySimple();
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}
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return nullptr;
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}
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EXPORT_FUNCTION const char * CALLING_CONVENTION GetNameSpace() {
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return "example";
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}
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}
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