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notepad-plus-plus/scintilla/lexers/LexPB.cxx
Don Ho 0152ded3ff [UPDATE] Scintilla update from 2.21 to 2.25 
git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@742 f5eea248-9336-0410-98b8-ebc06183d4e3
2011-03-22 00:16:49 +00:00

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