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https://github.com/scratchfoundation/bgfx.git
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448 lines
13 KiB
C++
448 lines
13 KiB
C++
// Scintilla source code edit control
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/**
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* @file LexMagik.cxx
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* Lexer for GE(r) Smallworld(tm) MagikSF
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*/
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// Copyright 1998-2005 by Neil Hodgson <neilh@scintilla.org>
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// The License.txt file describes the conditions under which this software may be distributed.
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <ctype.h>
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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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#include "WordList.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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#ifdef SCI_NAMESPACE
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using namespace Scintilla;
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#endif
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/**
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* Is it a core character (C isalpha(), exclamation and question mark)
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*
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* \param ch The character
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* \return True if ch is a character, False otherwise
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*/
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static inline bool IsAlphaCore(int ch) {
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return (isalpha(ch) || ch == '!' || ch == '?');
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}
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/**
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* Is it a character (IsAlphaCore() and underscore)
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*
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* \param ch The character
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* \return True if ch is a character, False otherwise
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*/
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static inline bool IsAlpha(int ch) {
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return (IsAlphaCore(ch) || ch == '_');
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}
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/**
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* Is it a symbolic character (IsAlpha() and colon)
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*
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* \param ch The character
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* \return True if ch is a character, False otherwise
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*/
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static inline bool IsAlphaSym(int ch) {
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return (IsAlpha(ch) || ch == ':');
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}
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/**
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* Is it a numerical character (IsAlpha() and 0 - 9)
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*
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* \param ch The character
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* \return True if ch is a character, False otherwise
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*/
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static inline bool IsAlNum(int ch) {
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return ((ch >= '0' && ch <= '9') || IsAlpha(ch));
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}
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/**
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* Is it a symbolic numerical character (IsAlNum() and colon)
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*
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* \param ch The character
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* \return True if ch is a character, False otherwise
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*/
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static inline bool IsAlNumSym(int ch) {
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return (IsAlNum(ch) || ch == ':');
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}
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/**
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* The lexer function
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*
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* \param startPos Where to start scanning
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* \param length Where to scan to
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* \param initStyle The style at the initial point, not used in this folder
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* \param keywordslists The keywordslists, currently, number 5 is used
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* \param styler The styler
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*/
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static void ColouriseMagikDoc(unsigned int startPos, int length, int initStyle,
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WordList *keywordlists[], Accessor &styler) {
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styler.StartAt(startPos);
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WordList &keywords = *keywordlists[0];
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WordList &pragmatics = *keywordlists[1];
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WordList &containers = *keywordlists[2];
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WordList &flow = *keywordlists[3];
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WordList &characters = *keywordlists[4];
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StyleContext sc(startPos, length, initStyle, styler);
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for (; sc.More(); sc.Forward()) {
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repeat:
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if(sc.ch == '#') {
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if (sc.chNext == '#') sc.SetState(SCE_MAGIK_HYPER_COMMENT);
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else sc.SetState(SCE_MAGIK_COMMENT);
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for(; sc.More() && !(sc.atLineEnd); sc.Forward());
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sc.SetState(SCE_MAGIK_DEFAULT);
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goto repeat;
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}
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if(sc.ch == '"') {
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sc.SetState(SCE_MAGIK_STRING);
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if(sc.More())
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{
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sc.Forward();
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for(; sc.More() && sc.ch != '"'; sc.Forward());
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}
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sc.ForwardSetState(SCE_MAGIK_DEFAULT);
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goto repeat;
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}
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// The default state
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if(sc.state == SCE_MAGIK_DEFAULT) {
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// A certain keyword has been detected
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if (sc.ch == '_' && (
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sc.currentPos == 0 || !IsAlNum(sc.chPrev))) {
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char keyword[50];
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memset(keyword, '\0', 50);
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for(
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int scanPosition = 0;
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scanPosition < 50;
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scanPosition++) {
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char keywordChar = static_cast<char>(
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tolower(styler.SafeGetCharAt(
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scanPosition +
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static_cast<int>(sc.currentPos+1), ' ')));
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if(IsAlpha(keywordChar)) {
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keyword[scanPosition] = keywordChar;
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} else {
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break;
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}
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}
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// It is a pragma
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if(pragmatics.InList(keyword)) {
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sc.SetState(SCE_MAGIK_PRAGMA);
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}
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// it is a normal keyword like _local, _self, etc.
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else if(keywords.InList(keyword)) {
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sc.SetState(SCE_MAGIK_KEYWORD);
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}
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// It is a container keyword, such as _method, _proc, etc.
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else if(containers.InList(keyword)) {
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sc.SetState(SCE_MAGIK_CONTAINER);
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}
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// It is a flow keyword, such as _for, _if, _try, etc.
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else if(flow.InList(keyword)) {
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sc.SetState(SCE_MAGIK_FLOW);
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}
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// Interpret as unknown keyword
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else {
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sc.SetState(SCE_MAGIK_UNKNOWN_KEYWORD);
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}
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}
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// Symbolic expression
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else if(sc.ch == ':' && !IsAlNum(sc.chPrev)) {
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sc.SetState(SCE_MAGIK_SYMBOL);
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bool firstTrip = true;
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for(sc.Forward(); sc.More(); sc.Forward()) {
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if(firstTrip && IsAlphaSym(sc.ch));
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else if(!firstTrip && IsAlNumSym(sc.ch));
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else if(sc.ch == '|') {
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for(sc.Forward();
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sc.More() && sc.ch != '|';
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sc.Forward());
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}
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else break;
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firstTrip = false;
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}
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sc.SetState(SCE_MAGIK_DEFAULT);
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goto repeat;
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}
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// Identifier (label) expression
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else if(sc.ch == '@') {
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sc.SetState(SCE_MAGIK_IDENTIFIER);
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bool firstTrip = true;
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for(sc.Forward(); sc.More(); sc.Forward()) {
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if(firstTrip && IsAlphaCore(sc.ch)) {
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firstTrip = false;
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}
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else if(!firstTrip && IsAlpha(sc.ch));
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else break;
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}
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sc.SetState(SCE_MAGIK_DEFAULT);
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goto repeat;
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}
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// Start of a character
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else if(sc.ch == '%') {
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sc.SetState(SCE_MAGIK_CHARACTER);
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sc.Forward();
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char keyword[50];
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memset(keyword, '\0', 50);
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for(
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int scanPosition = 0;
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scanPosition < 50;
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scanPosition++) {
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char keywordChar = static_cast<char>(
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tolower(styler.SafeGetCharAt(
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scanPosition +
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static_cast<int>(sc.currentPos), ' ')));
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if(IsAlpha(keywordChar)) {
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keyword[scanPosition] = keywordChar;
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} else {
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break;
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}
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}
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if(characters.InList(keyword)) {
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sc.Forward(static_cast<int>(strlen(keyword)));
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} else {
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sc.Forward();
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}
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sc.SetState(SCE_MAGIK_DEFAULT);
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goto repeat;
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}
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// Operators
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else if(
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sc.ch == '>' ||
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sc.ch == '<' ||
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sc.ch == '.' ||
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sc.ch == ',' ||
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sc.ch == '+' ||
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sc.ch == '-' ||
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sc.ch == '/' ||
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sc.ch == '*' ||
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sc.ch == '~' ||
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sc.ch == '$' ||
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sc.ch == '=') {
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sc.SetState(SCE_MAGIK_OPERATOR);
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}
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// Braces
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else if(sc.ch == '(' || sc.ch == ')') {
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sc.SetState(SCE_MAGIK_BRACE_BLOCK);
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}
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// Brackets
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else if(sc.ch == '{' || sc.ch == '}') {
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sc.SetState(SCE_MAGIK_BRACKET_BLOCK);
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}
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// Square Brackets
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else if(sc.ch == '[' || sc.ch == ']') {
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sc.SetState(SCE_MAGIK_SQBRACKET_BLOCK);
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}
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}
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// It is an operator
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else if(
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sc.state == SCE_MAGIK_OPERATOR ||
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sc.state == SCE_MAGIK_BRACE_BLOCK ||
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sc.state == SCE_MAGIK_BRACKET_BLOCK ||
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sc.state == SCE_MAGIK_SQBRACKET_BLOCK) {
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sc.SetState(SCE_MAGIK_DEFAULT);
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goto repeat;
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}
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// It is the pragma state
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else if(sc.state == SCE_MAGIK_PRAGMA) {
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if(!IsAlpha(sc.ch)) {
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sc.SetState(SCE_MAGIK_DEFAULT);
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goto repeat;
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}
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}
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// It is the keyword state
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else if(
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sc.state == SCE_MAGIK_KEYWORD ||
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sc.state == SCE_MAGIK_CONTAINER ||
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sc.state == SCE_MAGIK_FLOW ||
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sc.state == SCE_MAGIK_UNKNOWN_KEYWORD) {
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if(!IsAlpha(sc.ch)) {
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sc.SetState(SCE_MAGIK_DEFAULT);
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goto repeat;
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}
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}
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}
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sc.Complete();
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}
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/**
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* The word list description
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*/
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static const char * const magikWordListDesc[] = {
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"Accessors (local, global, self, super, thisthread)",
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"Pragmatic (pragma, private)",
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"Containers (method, block, proc)",
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"Flow (if, then, elif, else)",
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"Characters (space, tab, newline, return)",
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"Fold Containers (method, proc, block, if, loop)",
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0};
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/**
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* This function detects keywords which are able to have a body. Note that it
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* uses the Fold Containers word description, not the containers description. It
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* only works when the style at that particular position is set on Containers
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* or Flow (number 3 or 4).
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*
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* \param keywordslist The list of keywords that are scanned, they should only
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* contain the start keywords, not the end keywords
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* \param The actual keyword
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* \return 1 if it is a folding start-keyword, -1 if it is a folding end-keyword
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* 0 otherwise
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*/
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static inline int IsFoldingContainer(WordList &keywordslist, char * keyword) {
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if(
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strlen(keyword) > 3 &&
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keyword[0] == 'e' && keyword[1] == 'n' && keyword[2] == 'd') {
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if (keywordslist.InList(keyword + 3)) {
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return -1;
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}
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} else {
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if(keywordslist.InList(keyword)) {
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return 1;
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}
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}
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return 0;
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}
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/**
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* The folding function
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*
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* \param startPos Where to start scanning
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* \param length Where to scan to
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* \param keywordslists The keywordslists, currently, number 5 is used
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* \param styler The styler
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*/
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static void FoldMagikDoc(unsigned int startPos, int length, int,
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WordList *keywordslists[], Accessor &styler) {
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bool compact = styler.GetPropertyInt("fold.compact") != 0;
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WordList &foldingElements = *keywordslists[5];
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int endPos = startPos + length;
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int line = styler.GetLine(startPos);
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int level = styler.LevelAt(line) & SC_FOLDLEVELNUMBERMASK;
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int flags = styler.LevelAt(line) & ~SC_FOLDLEVELNUMBERMASK;
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for(
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int currentPos = startPos;
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currentPos < endPos;
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currentPos++) {
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char currentState = styler.StyleAt(currentPos);
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char c = styler.SafeGetCharAt(currentPos, ' ');
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int prevLine = styler.GetLine(currentPos - 1);
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line = styler.GetLine(currentPos);
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// Default situation
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if(prevLine < line) {
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styler.SetLevel(line, (level|flags) & ~SC_FOLDLEVELHEADERFLAG);
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flags = styler.LevelAt(line) & ~SC_FOLDLEVELNUMBERMASK;
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}
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if(
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(
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currentState == SCE_MAGIK_CONTAINER ||
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currentState == SCE_MAGIK_FLOW
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) &&
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c == '_') {
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char keyword[50];
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memset(keyword, '\0', 50);
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for(
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int scanPosition = 0;
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scanPosition < 50;
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scanPosition++) {
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char keywordChar = static_cast<char>(
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tolower(styler.SafeGetCharAt(
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scanPosition +
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currentPos + 1, ' ')));
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if(IsAlpha(keywordChar)) {
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keyword[scanPosition] = keywordChar;
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} else {
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break;
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}
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}
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if(IsFoldingContainer(foldingElements, keyword) > 0) {
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styler.SetLevel(
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line,
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styler.LevelAt(line) | SC_FOLDLEVELHEADERFLAG);
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level++;
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} else if(IsFoldingContainer(foldingElements, keyword) < 0) {
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styler.SetLevel(line, styler.LevelAt(line));
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level--;
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}
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}
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if(
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compact && (
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currentState == SCE_MAGIK_BRACE_BLOCK ||
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currentState == SCE_MAGIK_BRACKET_BLOCK ||
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currentState == SCE_MAGIK_SQBRACKET_BLOCK)) {
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if(c == '{' || c == '[' || c == '(') {
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styler.SetLevel(
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line,
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styler.LevelAt(line) | SC_FOLDLEVELHEADERFLAG);
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level++;
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} else if(c == '}' || c == ']' || c == ')') {
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styler.SetLevel(line, styler.LevelAt(line));
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level--;
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}
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}
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}
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}
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/**
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* Injecting the module
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*/
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LexerModule lmMagikSF(
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SCLEX_MAGIK, ColouriseMagikDoc, "magiksf", FoldMagikDoc, magikWordListDesc);
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