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325 lines
9.8 KiB
325 lines
9.8 KiB
// Scintilla source code edit control
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/** @file LexVB.cxx
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** Lexer for Visual Basic and VBScript.
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**/
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// Copyright 1998-2005 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 <string>
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#include <string_view>
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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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using namespace Lexilla;
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// Internal state, highlighted as number
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#define SCE_B_FILENUMBER SCE_B_DEFAULT+100
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static bool IsVBComment(Accessor &styler, Sci_Position pos, Sci_Position len) {
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return len > 0 && styler[pos] == '\'';
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}
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static inline bool IsTypeCharacter(int ch) {
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return ch == '%' || ch == '&' || ch == '@' || ch == '!' || ch == '#' || ch == '$';
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}
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// Extended to accept accented characters
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static inline bool IsAWordChar(int ch) {
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return ch >= 0x80 ||
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(isalnum(ch) || ch == '.' || ch == '_');
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}
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static inline bool IsAWordStart(int ch) {
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return ch >= 0x80 ||
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(isalpha(ch) || ch == '_');
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}
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static inline bool IsANumberChar(int ch) {
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// Not exactly following number definition (several dots are seen as OK, etc.)
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// but probably enough in most cases.
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return (ch < 0x80) &&
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(isdigit(ch) || toupper(ch) == 'E' ||
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ch == '.' || ch == '-' || ch == '+' || ch == '_');
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}
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static void ColouriseVBDoc(Sci_PositionU startPos, Sci_Position length, int initStyle,
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WordList *keywordlists[], Accessor &styler, bool vbScriptSyntax) {
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WordList &keywords = *keywordlists[0];
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WordList &keywords2 = *keywordlists[1];
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WordList &keywords3 = *keywordlists[2];
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WordList &keywords4 = *keywordlists[3];
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styler.StartAt(startPos);
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int visibleChars = 0;
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int fileNbDigits = 0;
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// Do not leak onto next line
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if (initStyle == SCE_B_STRINGEOL || initStyle == SCE_B_COMMENT || initStyle == SCE_B_PREPROCESSOR) {
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initStyle = SCE_B_DEFAULT;
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}
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StyleContext sc(startPos, length, initStyle, styler);
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for (; sc.More(); sc.Forward()) {
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if (sc.state == SCE_B_OPERATOR) {
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sc.SetState(SCE_B_DEFAULT);
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} else if (sc.state == SCE_B_IDENTIFIER) {
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if (!IsAWordChar(sc.ch)) {
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// In Basic (except VBScript), a variable name or a function name
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// can end with a special character indicating the type of the value
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// held or returned.
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bool skipType = false;
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if (!vbScriptSyntax && IsTypeCharacter(sc.ch)) {
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sc.Forward(); // Skip it
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skipType = true;
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}
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if (sc.ch == ']') {
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sc.Forward();
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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 (skipType) {
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s[strlen(s) - 1] = '\0';
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}
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if (strcmp(s, "rem") == 0) {
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sc.ChangeState(SCE_B_COMMENT);
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} else {
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if (keywords.InList(s)) {
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sc.ChangeState(SCE_B_KEYWORD);
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} else if (keywords2.InList(s)) {
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sc.ChangeState(SCE_B_KEYWORD2);
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} else if (keywords3.InList(s)) {
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sc.ChangeState(SCE_B_KEYWORD3);
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} else if (keywords4.InList(s)) {
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sc.ChangeState(SCE_B_KEYWORD4);
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} // Else, it is really an identifier...
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sc.SetState(SCE_B_DEFAULT);
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}
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}
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} else if (sc.state == SCE_B_NUMBER) {
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// We stop the number definition on non-numerical non-dot non-eE non-sign char
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// Also accepts A-F for hex. numbers
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if (!IsANumberChar(sc.ch) && !(tolower(sc.ch) >= 'a' && tolower(sc.ch) <= 'f')) {
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sc.SetState(SCE_B_DEFAULT);
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}
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} else if (sc.state == SCE_B_STRING) {
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// VB doubles quotes to preserve them, so just end this string
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// state now as a following quote will start again
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if (sc.ch == '\"') {
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if (sc.chNext == '\"') {
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sc.Forward();
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} else {
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if (tolower(sc.chNext) == 'c') {
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sc.Forward();
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}
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sc.ForwardSetState(SCE_B_DEFAULT);
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}
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} else if (sc.atLineEnd) {
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visibleChars = 0;
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sc.ChangeState(SCE_B_STRINGEOL);
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sc.ForwardSetState(SCE_B_DEFAULT);
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}
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} else if (sc.state == SCE_B_COMMENT) {
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if (sc.atLineEnd) {
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visibleChars = 0;
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sc.ForwardSetState(SCE_B_DEFAULT);
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}
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} else if (sc.state == SCE_B_PREPROCESSOR) {
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if (sc.atLineEnd) {
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visibleChars = 0;
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sc.ForwardSetState(SCE_B_DEFAULT);
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}
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} else if (sc.state == SCE_B_FILENUMBER) {
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if (IsADigit(sc.ch)) {
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fileNbDigits++;
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if (fileNbDigits > 3) {
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sc.ChangeState(SCE_B_DATE);
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}
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} else if (sc.ch == '\r' || sc.ch == '\n' || sc.ch == ',') {
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// Regular uses: Close #1; Put #1, ...; Get #1, ... etc.
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// Too bad if date is format #27, Oct, 2003# or something like that...
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// Use regular number state
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sc.ChangeState(SCE_B_NUMBER);
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sc.SetState(SCE_B_DEFAULT);
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} else if (sc.ch == '#') {
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sc.ChangeState(SCE_B_DATE);
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sc.ForwardSetState(SCE_B_DEFAULT);
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} else {
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sc.ChangeState(SCE_B_DATE);
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}
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if (sc.state != SCE_B_FILENUMBER) {
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fileNbDigits = 0;
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}
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} else if (sc.state == SCE_B_DATE) {
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if (sc.atLineEnd) {
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visibleChars = 0;
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sc.ChangeState(SCE_B_STRINGEOL);
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sc.ForwardSetState(SCE_B_DEFAULT);
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} else if (sc.ch == '#') {
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sc.ForwardSetState(SCE_B_DEFAULT);
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}
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}
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if (sc.state == SCE_B_DEFAULT) {
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if (sc.ch == '\'') {
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sc.SetState(SCE_B_COMMENT);
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} else if (sc.ch == '\"') {
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sc.SetState(SCE_B_STRING);
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} else if (sc.ch == '#' && visibleChars == 0) {
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// Preprocessor commands are alone on their line
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sc.SetState(SCE_B_PREPROCESSOR);
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} else if (sc.ch == '#') {
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// It can be a date literal, ending with #, or a file number, from 1 to 511
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// The date literal depends on the locale, so anything can go between #'s.
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// Can be #January 1, 1993# or #1 Jan 93# or #05/11/2003#, etc.
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// So we set the FILENUMBER state, and switch to DATE if it isn't a file number
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sc.SetState(SCE_B_FILENUMBER);
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} else if (sc.ch == '&' && tolower(sc.chNext) == 'h') {
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// Hexadecimal number
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sc.SetState(SCE_B_NUMBER);
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sc.Forward();
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} else if (sc.ch == '&' && tolower(sc.chNext) == 'o') {
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// Octal number
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sc.SetState(SCE_B_NUMBER);
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sc.Forward();
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} else if (sc.ch == '&' && tolower(sc.chNext) == 'b') {
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// Binary number
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sc.SetState(SCE_B_NUMBER);
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sc.Forward();
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} else if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
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sc.SetState(SCE_B_NUMBER);
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} else if (IsAWordStart(sc.ch) || (sc.ch == '[')) {
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sc.SetState(SCE_B_IDENTIFIER);
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} else if (isoperator(static_cast<char>(sc.ch)) || (sc.ch == '\\')) { // Integer division
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sc.SetState(SCE_B_OPERATOR);
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}
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}
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if (sc.atLineEnd) {
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visibleChars = 0;
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}
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if (!IsASpace(sc.ch)) {
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visibleChars++;
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}
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}
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if (sc.state == SCE_B_IDENTIFIER && !IsAWordChar(sc.ch)) {
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// In Basic (except VBScript), a variable name or a function name
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// can end with a special character indicating the type of the value
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// held or returned.
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bool skipType = false;
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if (!vbScriptSyntax && IsTypeCharacter(sc.ch)) {
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sc.Forward(); // Skip it
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skipType = true;
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}
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if (sc.ch == ']') {
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sc.Forward();
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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 (skipType) {
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s[strlen(s) - 1] = '\0';
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}
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if (strcmp(s, "rem") == 0) {
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sc.ChangeState(SCE_B_COMMENT);
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} else {
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if (keywords.InList(s)) {
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sc.ChangeState(SCE_B_KEYWORD);
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} else if (keywords2.InList(s)) {
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sc.ChangeState(SCE_B_KEYWORD2);
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} else if (keywords3.InList(s)) {
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sc.ChangeState(SCE_B_KEYWORD3);
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} else if (keywords4.InList(s)) {
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sc.ChangeState(SCE_B_KEYWORD4);
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} // Else, it is really an identifier...
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sc.SetState(SCE_B_DEFAULT);
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}
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}
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sc.Complete();
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}
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static void FoldVBDoc(Sci_PositionU startPos, Sci_Position length, int,
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WordList *[], Accessor &styler) {
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Sci_Position endPos = startPos + length;
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// Backtrack to previous line in case need to fix its fold status
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Sci_Position lineCurrent = styler.GetLine(startPos);
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if (startPos > 0) {
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if (lineCurrent > 0) {
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lineCurrent--;
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startPos = styler.LineStart(lineCurrent);
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}
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}
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int spaceFlags = 0;
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int indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, IsVBComment);
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char chNext = styler[startPos];
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for (Sci_Position i = startPos; i < endPos; i++) {
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char ch = chNext;
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chNext = styler.SafeGetCharAt(i + 1);
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if ((ch == '\r' && chNext != '\n') || (ch == '\n') || (i == endPos)) {
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int lev = indentCurrent;
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int indentNext = styler.IndentAmount(lineCurrent + 1, &spaceFlags, IsVBComment);
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if (!(indentCurrent & SC_FOLDLEVELWHITEFLAG)) {
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// Only non whitespace lines can be headers
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if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext & SC_FOLDLEVELNUMBERMASK)) {
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lev |= SC_FOLDLEVELHEADERFLAG;
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} else if (indentNext & SC_FOLDLEVELWHITEFLAG) {
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// Line after is blank so check the next - maybe should continue further?
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int spaceFlags2 = 0;
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int indentNext2 = styler.IndentAmount(lineCurrent + 2, &spaceFlags2, IsVBComment);
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if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext2 & SC_FOLDLEVELNUMBERMASK)) {
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lev |= SC_FOLDLEVELHEADERFLAG;
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}
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}
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}
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indentCurrent = indentNext;
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styler.SetLevel(lineCurrent, lev);
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lineCurrent++;
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}
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}
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}
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static void ColouriseVBNetDoc(Sci_PositionU startPos, Sci_Position length, int initStyle,
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WordList *keywordlists[], Accessor &styler) {
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ColouriseVBDoc(startPos, length, initStyle, keywordlists, styler, false);
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}
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static void ColouriseVBScriptDoc(Sci_PositionU startPos, Sci_Position length, int initStyle,
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WordList *keywordlists[], Accessor &styler) {
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ColouriseVBDoc(startPos, length, initStyle, keywordlists, styler, true);
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}
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static const char * const vbWordListDesc[] = {
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"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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LexerModule lmVB(SCLEX_VB, ColouriseVBNetDoc, "vb", FoldVBDoc, vbWordListDesc);
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LexerModule lmVBScript(SCLEX_VBSCRIPT, ColouriseVBScriptDoc, "vbscript", FoldVBDoc, vbWordListDesc);
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