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+// Scintilla source code edit control
+/** @file LexBasic.cxx
+ ** Lexer for BlitzBasic and PureBasic.
+ **/
+// Copyright 1998-2003 by Neil Hodgson <neilh@scintilla.org>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+// This tries to be a unified Lexer/Folder for all the BlitzBasic/BlitzMax/PurBasic basics
+// and derivatives. Once they diverge enough, might want to split it into multiple
+// lexers for more code clearity.
+//
+// Mail me (elias <at> users <dot> sf <dot> net) for any bugs.
+
+// Folding only works for simple things like functions or types.
+
+// You may want to have a look at my ctags lexer as well, if you additionally to coloring
+// and folding need to extract things like label tags in your editor.
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <ctype.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"
+
+/* Bits:
+ * 1 - whitespace
+ * 2 - operator
+ * 4 - identifier
+ * 8 - decimal digit
+ * 16 - hex digit
+ * 32 - bin digit
+ */
+static int character_classification[128] =
+{
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 1, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 10, 2,
+ 60, 60, 28, 28, 28, 28, 28, 28, 28, 28, 2, 2, 2, 2, 2, 2,
+ 2, 20, 20, 20, 20, 20, 20, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 4,
+ 2, 20, 20, 20, 20, 20, 20, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 0
+};
+
+static bool IsSpace(int c) {
+ return c < 128 && (character_classification[c] & 1);
+}
+
+static bool IsOperator(int c) {
+ return c < 128 && (character_classification[c] & 2);
+}
+
+static bool IsIdentifier(int c) {
+ return c < 128 && (character_classification[c] & 4);
+}
+
+static bool IsDigit(int c) {
+ return c < 128 && (character_classification[c] & 8);
+}
+
+static bool IsHexDigit(int c) {
+ return c < 128 && (character_classification[c] & 16);
+}
+
+static bool IsBinDigit(int c) {
+ return c < 128 && (character_classification[c] & 32);
+}
+
+static int LowerCase(int c)
+{
+ if (c >= 'A' && c <= 'Z')
+ return 'a' + c - 'A';
+ return c;
+}
+
+static void ColouriseBasicDoc(unsigned int startPos, int length, int initStyle,
+ WordList *keywordlists[], Accessor &styler, char comment_char) {
+ bool wasfirst = true, isfirst = true; // true if first token in a line
+ styler.StartAt(startPos);
+
+ StyleContext sc(startPos, length, initStyle, styler);
+
+ // Can't use sc.More() here else we miss the last character
+ for (; ; sc.Forward()) {
+ if (sc.state == SCE_B_IDENTIFIER) {
+ if (!IsIdentifier(sc.ch)) {
+ // Labels
+ if (wasfirst && sc.Match(':')) {
+ sc.ChangeState(SCE_B_LABEL);
+ sc.ForwardSetState(SCE_B_DEFAULT);
+ } else {
+ char s[100];
+ int kstates[4] = {
+ SCE_B_KEYWORD,
+ SCE_B_KEYWORD2,
+ SCE_B_KEYWORD3,
+ SCE_B_KEYWORD4,
+ };
+ sc.GetCurrentLowered(s, sizeof(s));
+ for (int i = 0; i < 4; i++) {
+ if (keywordlists[i]->InList(s)) {
+ sc.ChangeState(kstates[i]);
+ }
+ }
+ // Types, must set them as operator else they will be
+ // matched as number/constant
+ if (sc.Match('.') || sc.Match('$') || sc.Match('%') ||
+ sc.Match('#')) {
+ sc.SetState(SCE_B_OPERATOR);
+ } else {
+ sc.SetState(SCE_B_DEFAULT);
+ }
+ }
+ }
+ } else if (sc.state == SCE_B_OPERATOR) {
+ if (!IsOperator(sc.ch) || sc.Match('#'))
+ sc.SetState(SCE_B_DEFAULT);
+ } else if (sc.state == SCE_B_LABEL) {
+ if (!IsIdentifier(sc.ch))
+ sc.SetState(SCE_B_DEFAULT);
+ } else if (sc.state == SCE_B_CONSTANT) {
+ if (!IsIdentifier(sc.ch))
+ sc.SetState(SCE_B_DEFAULT);
+ } else if (sc.state == SCE_B_NUMBER) {
+ if (!IsDigit(sc.ch))
+ sc.SetState(SCE_B_DEFAULT);
+ } else if (sc.state == SCE_B_HEXNUMBER) {
+ if (!IsHexDigit(sc.ch))
+ sc.SetState(SCE_B_DEFAULT);
+ } else if (sc.state == SCE_B_BINNUMBER) {
+ if (!IsBinDigit(sc.ch))
+ sc.SetState(SCE_B_DEFAULT);
+ } else if (sc.state == SCE_B_STRING) {
+ if (sc.ch == '"') {
+ sc.ForwardSetState(SCE_B_DEFAULT);
+ }
+ if (sc.atLineEnd) {
+ sc.ChangeState(SCE_B_ERROR);
+ sc.SetState(SCE_B_DEFAULT);
+ }
+ } else if (sc.state == SCE_B_COMMENT || sc.state == SCE_B_PREPROCESSOR) {
+ if (sc.atLineEnd) {
+ sc.SetState(SCE_B_DEFAULT);
+ }
+ }
+
+ if (sc.atLineStart)
+ isfirst = true;
+
+ if (sc.state == SCE_B_DEFAULT || sc.state == SCE_B_ERROR) {
+ if (isfirst && sc.Match('.')) {
+ sc.SetState(SCE_B_LABEL);
+ } else if (isfirst && sc.Match('#')) {
+ wasfirst = isfirst;
+ sc.SetState(SCE_B_IDENTIFIER);
+ } else if (sc.Match(comment_char)) {
+ // Hack to make deprecated QBASIC '$Include show
+ // up in freebasic with SCE_B_PREPROCESSOR.
+ if (comment_char == '\'' && sc.Match(comment_char, '$'))
+ sc.SetState(SCE_B_PREPROCESSOR);
+ else
+ sc.SetState(SCE_B_COMMENT);
+ } else if (sc.Match('"')) {
+ sc.SetState(SCE_B_STRING);
+ } else if (IsDigit(sc.ch)) {
+ sc.SetState(SCE_B_NUMBER);
+ } else if (sc.Match('$')) {
+ sc.SetState(SCE_B_HEXNUMBER);
+ } else if (sc.Match('%')) {
+ sc.SetState(SCE_B_BINNUMBER);
+ } else if (sc.Match('#')) {
+ sc.SetState(SCE_B_CONSTANT);
+ } else if (IsOperator(sc.ch)) {
+ sc.SetState(SCE_B_OPERATOR);
+ } else if (IsIdentifier(sc.ch)) {
+ wasfirst = isfirst;
+ sc.SetState(SCE_B_IDENTIFIER);
+ } else if (!IsSpace(sc.ch)) {
+ sc.SetState(SCE_B_ERROR);
+ }
+ }
+
+ if (!IsSpace(sc.ch))
+ isfirst = false;
+
+ if (!sc.More())
+ break;
+ }
+ sc.Complete();
+}
+
+static int CheckBlitzFoldPoint(char const *token, int &level) {
+ if (!strcmp(token, "function") ||
+ !strcmp(token, "type")) {
+ level |= SC_FOLDLEVELHEADERFLAG;
+ return 1;
+ }
+ if (!strcmp(token, "end function") ||
+ !strcmp(token, "end type")) {
+ return -1;
+ }
+ return 0;
+}
+
+static int CheckPureFoldPoint(char const *token, int &level) {
+ if (!strcmp(token, "procedure") ||
+ !strcmp(token, "enumeration") ||
+ !strcmp(token, "interface") ||
+ !strcmp(token, "structure")) {
+ level |= SC_FOLDLEVELHEADERFLAG;
+ return 1;
+ }
+ if (!strcmp(token, "endprocedure") ||
+ !strcmp(token, "endenumeration") ||
+ !strcmp(token, "endinterface") ||
+ !strcmp(token, "endstructure")) {
+ return -1;
+ }
+ return 0;
+}
+
+static int CheckFreeFoldPoint(char const *token, int &level) {
+ if (!strcmp(token, "function") ||
+ !strcmp(token, "sub") ||
+ !strcmp(token, "type")) {
+ level |= SC_FOLDLEVELHEADERFLAG;
+ return 1;
+ }
+ if (!strcmp(token, "end function") ||
+ !strcmp(token, "end sub") ||
+ !strcmp(token, "end type")) {
+ return -1;
+ }
+ return 0;
+}
+
+static void FoldBasicDoc(unsigned int startPos, int length,
+ Accessor &styler, int (*CheckFoldPoint)(char const *, int &)) {
+ int line = styler.GetLine(startPos);
+ int level = styler.LevelAt(line);
+ int go = 0, done = 0;
+ int endPos = startPos + length;
+ char word[256];
+ int wordlen = 0;
+ int i;
+ bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
+ // Scan for tokens at the start of the line (they may include
+ // whitespace, for tokens like "End Function"
+ for (i = startPos; i < endPos; i++) {
+ int c = styler.SafeGetCharAt(i);
+ if (!done && !go) {
+ if (wordlen) { // are we scanning a token already?
+ word[wordlen] = static_cast<char>(LowerCase(c));
+ if (!IsIdentifier(c)) { // done with token
+ word[wordlen] = '\0';
+ go = CheckFoldPoint(word, level);
+ if (!go) {
+ // Treat any whitespace as single blank, for
+ // things like "End Function".
+ if (IsSpace(c) && IsIdentifier(word[wordlen - 1])) {
+ word[wordlen] = ' ';
+ if (wordlen < 255)
+ wordlen++;
+ }
+ else // done with this line
+ done = 1;
+ }
+ } else if (wordlen < 255) {
+ wordlen++;
+ }
+ } else { // start scanning at first non-whitespace character
+ if (!IsSpace(c)) {
+ if (IsIdentifier(c)) {
+ word[0] = static_cast<char>(LowerCase(c));
+ wordlen = 1;
+ } else // done with this line
+ done = 1;
+ }
+ }
+ }
+ if (c == '\n') { // line end
+ if (!done && wordlen == 0 && foldCompact) // line was only space
+ level |= SC_FOLDLEVELWHITEFLAG;
+ if (level != styler.LevelAt(line))
+ styler.SetLevel(line, level);
+ level += go;
+ line++;
+ // reset state
+ wordlen = 0;
+ level &= ~SC_FOLDLEVELHEADERFLAG;
+ level &= ~SC_FOLDLEVELWHITEFLAG;
+ go = 0;
+ done = 0;
+ }
+ }
+}
+
+static void ColouriseBlitzBasicDoc(unsigned int startPos, int length, int initStyle,
+ WordList *keywordlists[], Accessor &styler) {
+ ColouriseBasicDoc(startPos, length, initStyle, keywordlists, styler, ';');
+}
+
+static void ColourisePureBasicDoc(unsigned int startPos, int length, int initStyle,
+ WordList *keywordlists[], Accessor &styler) {
+ ColouriseBasicDoc(startPos, length, initStyle, keywordlists, styler, ';');
+}
+
+static void ColouriseFreeBasicDoc(unsigned int startPos, int length, int initStyle,
+ WordList *keywordlists[], Accessor &styler) {
+ ColouriseBasicDoc(startPos, length, initStyle, keywordlists, styler, '\'');
+}
+
+static void FoldBlitzBasicDoc(unsigned int startPos, int length, int,
+ WordList *[], Accessor &styler) {
+ FoldBasicDoc(startPos, length, styler, CheckBlitzFoldPoint);
+}
+
+static void FoldPureBasicDoc(unsigned int startPos, int length, int,
+ WordList *[], Accessor &styler) {
+ FoldBasicDoc(startPos, length, styler, CheckPureFoldPoint);
+}
+
+static void FoldFreeBasicDoc(unsigned int startPos, int length, int,
+ WordList *[], Accessor &styler) {
+ FoldBasicDoc(startPos, length, styler, CheckFreeFoldPoint);
+}
+
+static const char * const blitzbasicWordListDesc[] = {
+ "BlitzBasic Keywords",
+ "user1",
+ "user2",
+ "user3",
+ 0
+};
+
+static const char * const purebasicWordListDesc[] = {
+ "PureBasic Keywords",
+ "PureBasic PreProcessor Keywords",
+ "user defined 1",
+ "user defined 2",
+ 0
+};
+
+static const char * const freebasicWordListDesc[] = {
+ "FreeBasic Keywords",
+ "FreeBasic PreProcessor Keywords",
+ "user defined 1",
+ "user defined 2",
+ 0
+};
+
+LexerModule lmBlitzBasic(SCLEX_BLITZBASIC, ColouriseBlitzBasicDoc, "blitzbasic",
+ FoldBlitzBasicDoc, blitzbasicWordListDesc);
+
+LexerModule lmPureBasic(SCLEX_PUREBASIC, ColourisePureBasicDoc, "purebasic",
+ FoldPureBasicDoc, purebasicWordListDesc);
+
+LexerModule lmFreeBasic(SCLEX_FREEBASIC, ColouriseFreeBasicDoc, "freebasic",
+ FoldFreeBasicDoc, freebasicWordListDesc);
+
generated by cgit v1.2.1 (git 2.18.0) at 2025-01-09 17:03:26 +0000