mirror of
https://github.com/scratchfoundation/bgfx.git
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366 lines
12 KiB
C++
366 lines
12 KiB
C++
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// Scintilla source code edit control
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// @file LexPB.cxx
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// Lexer for PowerBasic by Roland Walter, roland@rowalt.de (for PowerBasic see www.powerbasic.com)
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//
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// Changes:
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// 17.10.2003: Toggling of subs/functions now until next sub/function - this gives better results
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// 29.10.2003: 1. Bug: Toggling didn't work for subs/functions added in editor
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// 2. Own colors for PB constants and Inline Assembler SCE_B_CONSTANT and SCE_B_ASM
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// 3. Several smaller syntax coloring improvements and speed optimizations
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// 12.07.2004: 1. Toggling for macros added
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// 2. Further folding speed optimitations (for people dealing with very large listings)
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//
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// Necessary changes for the PB lexer in Scintilla project:
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// - In SciLexer.h and Scintilla.iface:
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//
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// #define SCLEX_POWERBASIC 51 //ID for PowerBasic lexer
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// (...)
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// #define SCE_B_DEFAULT 0 //in both VB and PB lexer
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// #define SCE_B_COMMENT 1 //in both VB and PB lexer
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// #define SCE_B_NUMBER 2 //in both VB and PB lexer
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// #define SCE_B_KEYWORD 3 //in both VB and PB lexer
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// #define SCE_B_STRING 4 //in both VB and PB lexer
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// #define SCE_B_PREPROCESSOR 5 //VB lexer only, not in PB lexer
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// #define SCE_B_OPERATOR 6 //in both VB and PB lexer
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// #define SCE_B_IDENTIFIER 7 //in both VB and PB lexer
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// #define SCE_B_DATE 8 //VB lexer only, not in PB lexer
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// #define SCE_B_CONSTANT 13 //PB lexer only, not in VB lexer
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// #define SCE_B_ASM 14 //PB lexer only, not in VB lexer
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// - Statement added to KeyWords.cxx: 'LINK_LEXER(lmPB);'
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// - Statement added to scintilla_vc6.mak: '$(DIR_O)\LexPB.obj: ...\src\LexPB.cxx $(LEX_HEADERS)'
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//
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// Copyright for Scintilla: 1998-2001 by Neil Hodgson <neilh@scintilla.org>
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// The License.txt file describes the conditions under which this software may be distributed.
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <ctype.h>
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#include "ILexer.h"
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#include "Scintilla.h"
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#include "SciLexer.h"
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#include "WordList.h"
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#include "LexAccessor.h"
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#include "Accessor.h"
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#include "StyleContext.h"
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#include "CharacterSet.h"
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#include "LexerModule.h"
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#ifdef SCI_NAMESPACE
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using namespace Scintilla;
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#endif
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static inline bool IsTypeCharacter(const int ch)
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{
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return ch == '%' || ch == '&' || ch == '@' || ch == '!' || ch == '#' || ch == '$' || ch == '?';
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}
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static inline bool IsAWordChar(const int ch)
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{
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return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_');
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}
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static inline bool IsAWordStart(const int ch)
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{
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return (ch < 0x80) && (isalnum(ch) || ch == '_');
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}
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bool MatchUpperCase(Accessor &styler, int pos, const char *s) //Same as styler.Match() but uppercase comparison (a-z,A-Z and space only)
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{
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char ch;
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for (int i=0; *s; i++)
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{
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ch=styler.SafeGetCharAt(pos+i);
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if (ch > 0x60) ch -= '\x20';
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if (*s != ch) return false;
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s++;
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}
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return true;
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}
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static void ColourisePBDoc(unsigned int startPos, int length, int initStyle,WordList *keywordlists[],Accessor &styler) {
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WordList &keywords = *keywordlists[0];
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styler.StartAt(startPos);
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StyleContext sc(startPos, length, initStyle, styler);
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for (; sc.More(); sc.Forward()) {
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switch (sc.state)
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{
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case SCE_B_OPERATOR:
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{
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sc.SetState(SCE_B_DEFAULT);
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break;
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}
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case SCE_B_KEYWORD:
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{
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if (!IsAWordChar(sc.ch))
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{
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if (!IsTypeCharacter(sc.ch))
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{
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char s[100];
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sc.GetCurrentLowered(s, sizeof(s));
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if (keywords.InList(s))
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{
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if (strcmp(s, "rem") == 0)
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{
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sc.ChangeState(SCE_B_COMMENT);
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if (sc.atLineEnd) {sc.SetState(SCE_B_DEFAULT);}
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}
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else if (strcmp(s, "asm") == 0)
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{
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sc.ChangeState(SCE_B_ASM);
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if (sc.atLineEnd) {sc.SetState(SCE_B_DEFAULT);}
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}
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else
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{
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sc.SetState(SCE_B_DEFAULT);
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}
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}
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else
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{
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sc.ChangeState(SCE_B_IDENTIFIER);
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sc.SetState(SCE_B_DEFAULT);
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}
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}
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}
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break;
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}
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case SCE_B_NUMBER:
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{
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if (!IsAWordChar(sc.ch)) {sc.SetState(SCE_B_DEFAULT);}
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break;
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}
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case SCE_B_STRING:
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{
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if (sc.ch == '\"'){sc.ForwardSetState(SCE_B_DEFAULT);}
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break;
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}
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case SCE_B_CONSTANT:
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{
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if (!IsAWordChar(sc.ch)) {sc.SetState(SCE_B_DEFAULT);}
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break;
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}
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case SCE_B_COMMENT:
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{
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if (sc.atLineEnd) {sc.SetState(SCE_B_DEFAULT);}
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break;
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}
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case SCE_B_ASM:
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{
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if (sc.atLineEnd) {sc.SetState(SCE_B_DEFAULT);}
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break;
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}
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} //switch (sc.state)
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// Determine if a new state should be entered:
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if (sc.state == SCE_B_DEFAULT)
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{
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if (sc.ch == '\'') {sc.SetState(SCE_B_COMMENT);}
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else if (sc.ch == '\"') {sc.SetState(SCE_B_STRING);}
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else if (sc.ch == '&' && tolower(sc.chNext) == 'h') {sc.SetState(SCE_B_NUMBER);}
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else if (sc.ch == '&' && tolower(sc.chNext) == 'b') {sc.SetState(SCE_B_NUMBER);}
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else if (sc.ch == '&' && tolower(sc.chNext) == 'o') {sc.SetState(SCE_B_NUMBER);}
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else if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {sc.SetState(SCE_B_NUMBER);}
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else if (IsAWordStart(sc.ch)) {sc.SetState(SCE_B_KEYWORD);}
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else if (sc.ch == '%') {sc.SetState(SCE_B_CONSTANT);}
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else if (sc.ch == '$') {sc.SetState(SCE_B_CONSTANT);}
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else if (sc.ch == '#') {sc.SetState(SCE_B_KEYWORD);}
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else if (sc.ch == '!') {sc.SetState(SCE_B_ASM);}
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else if (isoperator(static_cast<char>(sc.ch)) || (sc.ch == '\\')) {sc.SetState(SCE_B_OPERATOR);}
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}
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} //for (; sc.More(); sc.Forward())
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sc.Complete();
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}
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//The folding routine for PowerBasic toggles SUBs and FUNCTIONs only. This was exactly what I wanted,
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//nothing more. I had worked with this kind of toggling for several years when I used the great good old
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//GFA Basic which is dead now. After testing the feature of toggling FOR-NEXT loops, WHILE-WEND loops
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//and so on too I found this is more disturbing then helping (for me). So if You think in another way
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//you can (or must) write Your own toggling routine ;-)
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static void FoldPBDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler)
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{
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// No folding enabled, no reason to continue...
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if( styler.GetPropertyInt("fold") == 0 )
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return;
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unsigned int endPos = startPos + length;
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int lineCurrent = styler.GetLine(startPos);
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int levelCurrent = SC_FOLDLEVELBASE;
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if (lineCurrent > 0)
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levelCurrent = styler.LevelAt(lineCurrent-1) >> 16;
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int levelNext = levelCurrent;
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char chNext = styler[startPos];
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bool fNewLine=true;
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bool fMightBeMultiLineMacro=false;
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bool fBeginOfCommentFound=false;
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for (unsigned int i = startPos; i < endPos; i++)
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{
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char ch = chNext;
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chNext = styler.SafeGetCharAt(i + 1);
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if (fNewLine) //Begin of a new line (The Sub/Function/Macro keywords may occur at begin of line only)
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{
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fNewLine=false;
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fBeginOfCommentFound=false;
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switch (ch)
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{
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case ' ': //Most lines start with space - so check this first, the code is the same as for 'default:'
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case '\t': //Handle tab too
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{
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int levelUse = levelCurrent;
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int lev = levelUse | levelNext << 16;
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styler.SetLevel(lineCurrent, lev);
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break;
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}
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case 'F':
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case 'f':
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{
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switch (chNext)
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{
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case 'U':
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case 'u':
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{
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if( MatchUpperCase(styler,i,"FUNCTION") )
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{
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styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
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levelNext=SC_FOLDLEVELBASE+1;
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}
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break;
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}
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}
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break;
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}
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case 'S':
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case 's':
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{
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switch (chNext)
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{
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case 'U':
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case 'u':
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{
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if( MatchUpperCase(styler,i,"SUB") )
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{
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styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
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levelNext=SC_FOLDLEVELBASE+1;
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}
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break;
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}
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case 'T':
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case 't':
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{
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if( MatchUpperCase(styler,i,"STATIC FUNCTION") )
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{
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styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
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levelNext=SC_FOLDLEVELBASE+1;
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}
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else if( MatchUpperCase(styler,i,"STATIC SUB") )
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{
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styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
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levelNext=SC_FOLDLEVELBASE+1;
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}
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break;
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}
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}
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break;
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}
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case 'C':
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case 'c':
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{
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switch (chNext)
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{
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case 'A':
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case 'a':
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{
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if( MatchUpperCase(styler,i,"CALLBACK FUNCTION") )
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{
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styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
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levelNext=SC_FOLDLEVELBASE+1;
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}
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break;
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}
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}
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break;
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}
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case 'M':
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case 'm':
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{
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switch (chNext)
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{
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case 'A':
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case 'a':
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{
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if( MatchUpperCase(styler,i,"MACRO") )
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{
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fMightBeMultiLineMacro=true; //Set folder level at end of line, we have to check for single line macro
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}
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break;
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}
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}
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break;
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}
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default:
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{
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int levelUse = levelCurrent;
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int lev = levelUse | levelNext << 16;
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styler.SetLevel(lineCurrent, lev);
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break;
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}
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} //switch (ch)
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} //if( fNewLine )
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switch (ch)
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{
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case '=': //To test single line macros
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{
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if (fBeginOfCommentFound==false)
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fMightBeMultiLineMacro=false; //The found macro is a single line macro only;
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break;
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}
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case '\'': //A comment starts
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{
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fBeginOfCommentFound=true;
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break;
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}
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case '\n':
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{
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if (fMightBeMultiLineMacro) //The current line is the begin of a multi line macro
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{
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fMightBeMultiLineMacro=false;
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styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
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levelNext=SC_FOLDLEVELBASE+1;
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}
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lineCurrent++;
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levelCurrent = levelNext;
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fNewLine=true;
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break;
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}
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case '\r':
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{
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if (chNext != '\n')
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{
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lineCurrent++;
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levelCurrent = levelNext;
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fNewLine=true;
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}
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break;
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}
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} //switch (ch)
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} //for (unsigned int i = startPos; i < endPos; i++)
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}
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static const char * const pbWordListDesc[] = {
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"Keywords",
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0
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};
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LexerModule lmPB(SCLEX_POWERBASIC, ColourisePBDoc, "powerbasic", FoldPBDoc, pbWordListDesc);
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