PowerBasic lexer added.

2 files changed, 243 insertions, 0 deletions

diff --git a/src/KeyWords.cxx b/src/KeyWords.cxx
index 7ec5d9922..45eb83027 100644
--- a/src/KeyWords.cxx
+++ b/src/KeyWords.cxx
@@ -167,6 +167,7 @@ int Scintilla_LinkLexers() {
 	LINK_LEXER(lmLatex);
 	LINK_LEXER(lmNull);
 	LINK_LEXER(lmPascal);
+	LINK_LEXER(lmPB);
 	LINK_LEXER(lmPerl);
 	LINK_LEXER(lmPOV);
 	LINK_LEXER(lmPS);
diff --git a/src/LexPB.cxx b/src/LexPB.cxx
new file mode 100644
index 000000000..3564207df
--- /dev/null
+++ b/src/LexPB.cxx
@@ -0,0 +1,242 @@
+// Scintilla source code edit control
+/** @file LexPB.cxx
+ ** Lexer for PowerBasic by Roland Walter, roland@rowalt.de
+ **/
+//
+// Necessary changes in Scintilla project:
+//  - In SciLexer.h and Scintilla.iface:
+//
+//    #define SCLEX_PB 49				//Provisional inofficial 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, unsupported by 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, unsupported by PB lexer
+
+//  - Statement added to KeyWords.cxx:      'LINK_LEXER(lmPB);'
+//  - Statement added to scintilla_vc6.mak: '$(DIR_O)\LexPB.obj: ..\src\LexPB.cxx $(LEX_HEADERS)'
+//
+// Copyright for Scintilla: 1998-2001 by Neil Hodgson <neilh@scintilla.org>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "Platform.h"
+
+#include "PropSet.h"
+#include "Accessor.h"
+#include "StyleContext.h"
+#include "KeyWords.h"
+#include "Scintilla.h"
+#include "SciLexer.h"
+
+static inline bool IsTypeCharacter(const int ch) {
+	return ch == '%' || ch == '&' || ch == '@' || ch == '!' || ch == '#' || ch == '$';
+}
+
+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()) {
+
+		if (sc.state == SCE_B_OPERATOR)
+		{
+			sc.SetState(SCE_B_DEFAULT);
+		}
+		else if (sc.state == SCE_B_KEYWORD)
+		{
+			if (!IsAWordChar(sc.ch))
+			{
+				if (!IsTypeCharacter(sc.ch))
+				{
+					if (sc.ch == ']') {sc.Forward();}
+					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
+						{
+							sc.SetState(SCE_B_DEFAULT);
+						}
+					}
+					else
+					{
+						sc.ChangeState(SCE_B_IDENTIFIER);
+						sc.SetState(SCE_B_DEFAULT);
+					}
+				}
+			}
+		}
+		else if (sc.state == SCE_B_NUMBER)
+		{
+			if (!IsAWordChar(sc.ch)) {sc.SetState(SCE_B_DEFAULT);}
+		}
+		else if (sc.state == SCE_B_STRING)
+		{
+			// PB doubles quotes to preserve them, so just end this string
+			// state now as a following quote will start again
+			if (sc.ch == '\"')
+			{
+				if (tolower(sc.chNext) == 'c') {sc.Forward();}
+				sc.ForwardSetState(SCE_B_DEFAULT);
+			}
+		}
+		else if (sc.state == SCE_B_COMMENT)
+		{
+			if (sc.atLineEnd) {sc.SetState(SCE_B_DEFAULT);}
+		}
+
+		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 == '#')
+			{	int n = 1;
+				int chSeek = ' ';
+				while ((n < 100) && (chSeek == ' ' || chSeek == '\t'))
+				{
+					chSeek = sc.GetRelative(n);
+					n++;
+				}
+				sc.SetState(SCE_B_OPERATOR);
+			}
+			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.ch == '[')) {sc.SetState(SCE_B_KEYWORD);}
+			else if (isoperator(static_cast<char>(sc.ch)) || (sc.ch == '\\')) {sc.SetState(SCE_B_OPERATOR);}
+		}
+
+	}
+	sc.Complete();
+}
+
+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 atEOL=1;
+	for (unsigned int i = startPos; i < endPos; i++)
+	{
+		char ch = chNext;
+		chNext = styler.SafeGetCharAt(i + 1);
+		// Functions Start: Function, Sub
+		// Functions End: End Function, End Sub
+
+		if( atEOL )			//Begin of a new line (The Sub/Function/Macro keywords may occur at begin of line only)
+		{
+			if( MatchUpperCase(styler,i,"END FUNCTION") )
+				levelNext=SC_FOLDLEVELBASE;
+			else if( MatchUpperCase(styler,i,"FUNCTION") )
+			{
+				styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
+				levelNext=SC_FOLDLEVELBASE+1;
+			}
+			else if( MatchUpperCase(styler,i,"CALLBACK FUNCTION") )
+			{
+				styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
+				levelNext=SC_FOLDLEVELBASE+1;
+			}
+			else if( MatchUpperCase(styler,i,"STATIC FUNCTION") )
+			{
+				styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
+				levelNext=SC_FOLDLEVELBASE+1;
+			}
+			else if( MatchUpperCase(styler,i,"END SUB") )
+				levelNext=SC_FOLDLEVELBASE;
+			else if( MatchUpperCase(styler,i,"SUB") )
+			{
+				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;
+			}
+			//else if( MatchUpperCase(styler,i,"END MACRO") )
+			//	levelNext--;
+			//else if( MatchUpperCase(styler,i,"MACRO") )  //ToDo: What's with single-line macros?
+			//	levelNext++;
+		}
+
+		atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
+		if( atEOL )
+		{
+			if (levelNext == SC_FOLDLEVELBASE)
+			{
+				int levelUse = levelCurrent;
+				int lev = levelUse | levelNext << 16;
+				styler.SetLevel(lineCurrent, lev);
+			}
+			lineCurrent++;
+			levelCurrent = levelNext;
+		}
+	}
+
+	if (levelNext == SC_FOLDLEVELBASE)
+	{
+		int levelUse = levelCurrent;
+		int lev = levelUse | levelNext << 16;
+		styler.SetLevel(lineCurrent, lev);
+	}
+}
+
+static const char * const pbWordListDesc[] = {
+	"Keywords",
+	0
+};
+
+LexerModule lmPB(SCLEX_POWERBASIC, ColourisePBDoc, "powerbasic", FoldPBDoc, pbWordListDesc);