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