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notepad-plus-plus/lexilla/lexers/LexDataflex.cxx

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// Scintilla source code edit control
/** @file LexDataflex.cxx
** Lexer for DataFlex.
** Based on LexPascal.cxx
** Written by Wil van Antwerpen, June 2019
**/
/*
// The License.txt file describes the conditions under which this software may be distributed.
A few words about features of LexDataflex...
Generally speaking LexDataflex tries to support all available DataFlex features (up
to DataFlex 19.1 at this time).
~ FOLDING:
Folding is supported in the following cases:
- Folding of stream-like comments
- Folding of groups of consecutive line comments
- Folding of preprocessor blocks (the following preprocessor blocks are
supported: #IFDEF, #IFNDEF, #ENDIF and #HEADER / #ENDHEADER
blocks),
- Folding of code blocks on appropriate keywords (the following code blocks are
supported: "begin, struct, type, case / end" blocks, class & object
declarations and interface declarations)
Remarks:
- We pass 4 arrays to the lexer:
1. The DataFlex keyword list, these are normal DataFlex keywords
2. The Scope Open list, for example, begin / procedure / while
3. The Scope Close list, for example, end / end_procedure / loop
4. Operator list, for ex. + / - / * / Lt / iand
These lists are all mutually exclusive, scope open words should not be in the keyword list and vice versa
- Folding of code blocks tries to handle all special cases in which folding
should not occur.
~ KEYWORDS:
The list of keywords that can be used in dataflex.properties file (up to DataFlex
19.1):
- Keywords: .. snipped .. see dataflex.properties file.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <ctype.h>
#include <string>
#include <string_view>
#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"
using namespace Lexilla;
static void GetRangeLowered(Sci_PositionU start,
Sci_PositionU end,
Accessor &styler,
char *s,
Sci_PositionU len) {
Sci_PositionU i = 0;
while ((i < end - start + 1) && (i < len-1)) {
s[i] = static_cast<char>(tolower(styler[start + i]));
i++;
}
s[i] = '\0';
}
static void GetForwardRangeLowered(Sci_PositionU start,
CharacterSet &charSet,
Accessor &styler,
char *s,
Sci_PositionU len) {
Sci_PositionU i = 0;
while ((i < len-1) && charSet.Contains(styler.SafeGetCharAt(start + i))) {
s[i] = static_cast<char>(tolower(styler.SafeGetCharAt(start + i)));
i++;
}
s[i] = '\0';
}
enum {
stateInICode = 0x1000,
stateSingleQuoteOpen = 0x2000,
stateDoubleQuoteOpen = 0x4000,
stateFoldInPreprocessor = 0x0100,
stateFoldInCaseStatement = 0x0200,
stateFoldInPreprocessorLevelMask = 0x00FF,
stateFoldMaskAll = 0x0FFF
};
static bool IsFirstDataFlexWord(Sci_Position pos, Accessor &styler) {
Sci_Position line = styler.GetLine(pos);
Sci_Position start_pos = styler.LineStart(line);
for (Sci_Position i = start_pos; i < pos; i++) {
char ch = styler.SafeGetCharAt(i);
if (!(ch == ' ' || ch == '\t'))
return false;
}
return true;
}
inline bool IsADataFlexField(int ch) {
return (ch == '.');
}
static void ClassifyDataFlexWord(WordList *keywordlists[], StyleContext &sc, Accessor &styler) {
WordList& keywords = *keywordlists[0];
WordList& scopeOpen = *keywordlists[1];
WordList& scopeClosed = *keywordlists[2];
WordList& operators = *keywordlists[3];
char s[100];
int oldState;
int newState;
size_t tokenlen;
oldState = sc.state;
newState = oldState;
sc.GetCurrentLowered(s, sizeof(s));
tokenlen = strnlen(s,sizeof(s));
if (keywords.InList(s)) {
// keywords in DataFlex can be used as table column names (file.field) and as such they
// should not be characterized as a keyword. So test for that.
// for ex. somebody using date as field name.
if (!IsADataFlexField(sc.GetRelative(-static_cast<int>(tokenlen+1)))) {
newState = SCE_DF_WORD;
}
}
if (oldState == newState) {
if ((scopeOpen.InList(s) || scopeClosed.InList(s)) && (strcmp(s, "for") != 0) && (strcmp(s, "repeat") != 0)) {
// scope words in DataFlex can be used as table column names (file.field) and as such they
// should not be characterized as a scope word. So test for that.
// for ex. somebody using procedure for field name.
if (!IsADataFlexField(sc.GetRelative(-static_cast<int>(tokenlen+1)))) {
newState = SCE_DF_SCOPEWORD;
}
}
// no code folding on the next words, but just want to paint them like keywords (as they are) (??? doesn't the code to the opposite?)
if (strcmp(s, "if") == 0 ||
strcmp(s, "ifnot") == 0 ||
strcmp(s, "case") == 0 ||
strcmp(s, "else") == 0 ) {
newState = SCE_DF_SCOPEWORD;
}
}
if (oldState != newState && newState == SCE_DF_WORD) {
// a for loop must have for at the start of the line, for is also used in "define abc for 123"
if ( (strcmp(s, "for") == 0) && (IsFirstDataFlexWord(sc.currentPos-3, styler)) ) {
newState = SCE_DF_SCOPEWORD;
}
}
if (oldState != newState && newState == SCE_DF_WORD) {
// a repeat loop must have repeat at the start of the line, repeat is also used in 'move (repeat("d",5)) to sFoo'
if ( (strcmp(s, "repeat") == 0) && (IsFirstDataFlexWord(sc.currentPos-6, styler)) ) {
newState = SCE_DF_SCOPEWORD;
}
}
if (oldState == newState) {
if (operators.InList(s)) {
newState = SCE_DF_OPERATOR;
}
}
if (oldState != newState) {
sc.ChangeState(newState);
}
sc.SetState(SCE_DF_DEFAULT);
}
static void ColouriseDataFlexDoc(Sci_PositionU startPos, Sci_Position length, int initStyle, WordList *keywordlists[],
Accessor &styler) {
// bool bSmartHighlighting = styler.GetPropertyInt("lexer.dataflex.smart.highlighting", 1) != 0;
CharacterSet setWordStart(CharacterSet::setAlpha, "_$#@", 0x80, true);
CharacterSet setWord(CharacterSet::setAlphaNum, "_$#@", 0x80, true);
CharacterSet setNumber(CharacterSet::setDigits, ".-+eE");
CharacterSet setHexNumber(CharacterSet::setDigits, "abcdefABCDEF");
CharacterSet setOperator(CharacterSet::setNone, "*+-/<=>^");
Sci_Position curLine = styler.GetLine(startPos);
int curLineState = curLine > 0 ? styler.GetLineState(curLine - 1) : 0;
StyleContext sc(startPos, length, initStyle, styler);
for (; sc.More(); sc.Forward()) {
if (sc.atLineEnd) {
// Update the line state, so it can be seen by next line
curLine = styler.GetLine(sc.currentPos);
styler.SetLineState(curLine, curLineState);
}
// Determine if the current state should terminate.
switch (sc.state) {
case SCE_DF_NUMBER:
if (!setNumber.Contains(sc.ch) || (sc.ch == '.' && sc.chNext == '.')) {
sc.SetState(SCE_DF_DEFAULT);
} else if (sc.ch == '-' || sc.ch == '+') {
if (sc.chPrev != 'E' && sc.chPrev != 'e') {
sc.SetState(SCE_DF_DEFAULT);
}
}
break;
case SCE_DF_IDENTIFIER:
if (!setWord.Contains(sc.ch)) {
ClassifyDataFlexWord(keywordlists, sc, styler);
}
break;
case SCE_DF_HEXNUMBER:
if (!(setHexNumber.Contains(sc.ch) || sc.ch == 'I') ) { // in |CI$22a we also want to color the "I"
sc.SetState(SCE_DF_DEFAULT);
}
break;
case SCE_DF_METATAG:
if (sc.atLineStart || sc.chPrev == '}') {
sc.SetState(SCE_DF_DEFAULT);
}
break;
case SCE_DF_PREPROCESSOR:
if (sc.atLineStart || IsASpaceOrTab(sc.ch)) {
sc.SetState(SCE_DF_DEFAULT);
}
break;
case SCE_DF_IMAGE:
if (sc.atLineStart && sc.Match("/*")) {
sc.Forward(); // these characters are still part of the DF Image
sc.ForwardSetState(SCE_DF_DEFAULT);
}
break;
case SCE_DF_PREPROCESSOR2:
// we don't have inline comments or preprocessor2 commands
//if (sc.Match('*', ')')) {
// sc.Forward();
// sc.ForwardSetState(SCE_DF_DEFAULT);
//}
break;
case SCE_DF_COMMENTLINE:
if (sc.atLineStart) {
sc.SetState(SCE_DF_DEFAULT);
}
break;
case SCE_DF_STRING:
if (sc.atLineEnd) {
sc.ChangeState(SCE_DF_STRINGEOL);
} else if (sc.ch == '\'' && sc.chNext == '\'') {
sc.Forward();
} else if (sc.ch == '\"' && sc.chNext == '\"') {
sc.Forward();
} else if (sc.ch == '\'' || sc.ch == '\"') {
if (sc.ch == '\'' && (curLineState & stateSingleQuoteOpen) ) {
curLineState &= ~(stateSingleQuoteOpen);
sc.ForwardSetState(SCE_DF_DEFAULT);
}
else if (sc.ch == '\"' && (curLineState & stateDoubleQuoteOpen) ) {
curLineState &= ~(stateDoubleQuoteOpen);
sc.ForwardSetState(SCE_DF_DEFAULT);
}
}
break;
case SCE_DF_STRINGEOL:
if (sc.atLineStart) {
sc.SetState(SCE_DF_DEFAULT);
}
break;
case SCE_DF_SCOPEWORD:
//if (!setHexNumber.Contains(sc.ch) && sc.ch != '$') {
// sc.SetState(SCE_DF_DEFAULT);
//}
break;
case SCE_DF_OPERATOR:
// if (bSmartHighlighting && sc.chPrev == ';') {
// curLineState &= ~(stateInProperty | stateInExport);
// }
sc.SetState(SCE_DF_DEFAULT);
break;
case SCE_DF_ICODE:
if (sc.atLineStart || IsASpace(sc.ch) || isoperator(sc.ch)) {
sc.SetState(SCE_DF_DEFAULT);
}
break;
}
// Determine if a new state should be entered.
if (sc.state == SCE_DF_DEFAULT) {
if (IsADigit(sc.ch)) {
sc.SetState(SCE_DF_NUMBER);
} else if (sc.Match('/', '/') || sc.Match("#REM")) {
sc.SetState(SCE_DF_COMMENTLINE);
} else if ((sc.ch == '#' && !sc.Match("#REM")) && IsFirstDataFlexWord(sc.currentPos, styler)) {
sc.SetState(SCE_DF_PREPROCESSOR);
// || (sc.ch == '|' && sc.chNext == 'C' && sc.GetRelativeCharacter(2) == 'I' && sc.GetRelativeCharacter(3) == '$') ) {
} else if ((sc.ch == '$' && ((!setWord.Contains(sc.chPrev)) || sc.chPrev == 'I' ) ) || (sc.Match("|CI$")) ) {
sc.SetState(SCE_DF_HEXNUMBER); // start with $ and previous character not in a..zA..Z0..9 excluding "I" OR start with |CI$
} else if (setWordStart.Contains(sc.ch)) {
sc.SetState(SCE_DF_IDENTIFIER);
} else if (sc.ch == '{') {
sc.SetState(SCE_DF_METATAG);
//} else if (sc.Match("(*$")) {
// sc.SetState(SCE_DF_PREPROCESSOR2);
} else if (sc.ch == '/' && setWord.Contains(sc.chNext) && sc.atLineStart) {
sc.SetState(SCE_DF_IMAGE);
// sc.Forward(); // Eat the * so it isn't used for the end of the comment
} else if (sc.ch == '\'' || sc.ch == '\"') {
if (sc.ch == '\'' && !(curLineState & stateDoubleQuoteOpen)) {
curLineState |= stateSingleQuoteOpen;
} else if (sc.ch == '\"' && !(curLineState & stateSingleQuoteOpen)) {
curLineState |= stateDoubleQuoteOpen;
}
sc.SetState(SCE_DF_STRING);
} else if (setOperator.Contains(sc.ch)) {
sc.SetState(SCE_DF_OPERATOR);
// } else if (curLineState & stateInICode) {
// ICode start ! in a string followed by close string mark is not icode
} else if ((sc.ch == '!') && !(sc.ch == '!' && ((sc.chNext == '\"') || (sc.ch == '\'')) )) {
sc.SetState(SCE_DF_ICODE);
}
}
}
if (sc.state == SCE_DF_IDENTIFIER && setWord.Contains(sc.chPrev)) {
ClassifyDataFlexWord(keywordlists, sc, styler);
}
sc.Complete();
}
static bool IsStreamCommentStyle(int style) {
return style == SCE_DF_IMAGE;
}
static bool IsCommentLine(Sci_Position line, Accessor &styler) {
Sci_Position pos = styler.LineStart(line);
Sci_Position eolPos = styler.LineStart(line + 1) - 1;
for (Sci_Position i = pos; i < eolPos; i++) {
char ch = styler[i];
char chNext = styler.SafeGetCharAt(i + 1);
int style = styler.StyleAt(i);
if (ch == '/' && chNext == '/' && style == SCE_DF_COMMENTLINE) {
return true;
} else if (!IsASpaceOrTab(ch)) {
return false;
}
}
return false;
}
static unsigned int GetFoldInPreprocessorLevelFlag(int lineFoldStateCurrent) {
return lineFoldStateCurrent & stateFoldInPreprocessorLevelMask;
}
static void SetFoldInPreprocessorLevelFlag(int &lineFoldStateCurrent, unsigned int nestLevel) {
lineFoldStateCurrent &= ~stateFoldInPreprocessorLevelMask;
lineFoldStateCurrent |= nestLevel & stateFoldInPreprocessorLevelMask;
}
static int ClassifyDataFlexPreprocessorFoldPoint(int &levelCurrent, int &lineFoldStateCurrent,
Sci_PositionU startPos, Accessor &styler) {
CharacterSet setWord(CharacterSet::setAlpha);
char s[100]; // Size of the longest possible keyword + one additional character + null
GetForwardRangeLowered(startPos, setWord, styler, s, sizeof(s));
size_t iLen = strnlen(s,sizeof(s));
size_t iWordSize = 0;
unsigned int nestLevel = GetFoldInPreprocessorLevelFlag(lineFoldStateCurrent);
if (strcmp(s, "command") == 0 ||
// The #if/#ifdef etcetera commands are not currently foldable as it is easy to write code that
// breaks the collaps logic, so we keep things simple and not include that for now.
strcmp(s, "header") == 0) {
nestLevel++;
SetFoldInPreprocessorLevelFlag(lineFoldStateCurrent, nestLevel);
lineFoldStateCurrent |= stateFoldInPreprocessor;
levelCurrent++;
iWordSize = iLen;
} else if (strcmp(s, "endcommand") == 0 ||
strcmp(s, "endheader") == 0) {
nestLevel--;
SetFoldInPreprocessorLevelFlag(lineFoldStateCurrent, nestLevel);
if (nestLevel == 0) {
lineFoldStateCurrent &= ~stateFoldInPreprocessor;
}
levelCurrent--;
iWordSize = iLen;
if (levelCurrent < SC_FOLDLEVELBASE) {
levelCurrent = SC_FOLDLEVELBASE;
}
}
return static_cast<int>(iWordSize);
}
static void ClassifyDataFlexWordFoldPoint(int &levelCurrent, int &lineFoldStateCurrent,
Sci_PositionU lastStart, Sci_PositionU currentPos, WordList *[], Accessor &styler) {
char s[100];
// property fold.dataflex.compilerlist
// Set to 1 for enabling the code folding feature in *.prn files
bool foldPRN = styler.GetPropertyInt("fold.dataflex.compilerlist",0) != 0;
GetRangeLowered(lastStart, currentPos, styler, s, sizeof(s));
if (strcmp(s, "case") == 0) {
lineFoldStateCurrent |= stateFoldInCaseStatement;
} else if (strcmp(s, "begin") == 0) {
levelCurrent++;
} else if (strcmp(s, "for") == 0 ||
strcmp(s, "while") == 0 ||
strcmp(s, "repeat") == 0 ||
strcmp(s, "for_all") == 0 ||
strcmp(s, "struct") == 0 ||
strcmp(s, "type") == 0 ||
strcmp(s, "begin_row") == 0 ||
strcmp(s, "item_list") == 0 ||
strcmp(s, "begin_constraints") == 0 ||
strcmp(s, "begin_transaction") == 0 ||
strcmp(s, "enum_list") == 0 ||
strcmp(s, "class") == 0 ||
strcmp(s, "object") == 0 ||
strcmp(s, "cd_popup_object") == 0 ||
strcmp(s, "procedure") == 0 ||
strcmp(s, "procedure_section") == 0 ||
strcmp(s, "function") == 0 ) {
if ((IsFirstDataFlexWord(lastStart, styler )) || foldPRN) {
levelCurrent++;
}
} else if (strcmp(s, "end") == 0) { // end is not always the first keyword, for example "case end"
levelCurrent--;
if (levelCurrent < SC_FOLDLEVELBASE) {
levelCurrent = SC_FOLDLEVELBASE;
}
} else if (strcmp(s, "loop") == 0 ||
strcmp(s, "until") == 0 ||
strcmp(s, "end_class") == 0 ||
strcmp(s, "end_object") == 0 ||
strcmp(s, "cd_end_object") == 0 ||
strcmp(s, "end_procedure") == 0 ||
strcmp(s, "end_function") == 0 ||
strcmp(s, "end_for_all") == 0 ||
strcmp(s, "end_struct") == 0 ||
strcmp(s, "end_type") == 0 ||
strcmp(s, "end_row") == 0 ||
strcmp(s, "end_item_list") == 0 ||
strcmp(s, "end_constraints") == 0 ||
strcmp(s, "end_transaction") == 0 ||
strcmp(s, "end_enum_list") == 0 ) {
// lineFoldStateCurrent &= ~stateFoldInRecord;
if ((IsFirstDataFlexWord(lastStart, styler )) || foldPRN) {
levelCurrent--;
if (levelCurrent < SC_FOLDLEVELBASE) {
levelCurrent = SC_FOLDLEVELBASE;
}
}
}
}
static void ClassifyDataFlexMetaDataFoldPoint(int &levelCurrent,
Sci_PositionU lastStart, Sci_PositionU currentPos, WordList *[], Accessor &styler) {
char s[100];
GetRangeLowered(lastStart, currentPos, styler, s, sizeof(s));
if (strcmp(s, "#beginsection") == 0) {
levelCurrent++;
} else if (strcmp(s, "#endsection") == 0) {
levelCurrent--;
if (levelCurrent < SC_FOLDLEVELBASE) {
levelCurrent = SC_FOLDLEVELBASE;
}
}
}
static void FoldDataFlexDoc(Sci_PositionU startPos, Sci_Position length, int initStyle, WordList *keywordlists[],
Accessor &styler) {
bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
bool foldPreprocessor = styler.GetPropertyInt("fold.preprocessor") != 0;
bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
Sci_PositionU endPos = startPos + length;
int visibleChars = 0;
Sci_Position lineCurrent = styler.GetLine(startPos);
int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
int levelCurrent = levelPrev;
int lineFoldStateCurrent = lineCurrent > 0 ? styler.GetLineState(lineCurrent - 1) & stateFoldMaskAll : 0;
char chNext = styler[startPos];
int styleNext = styler.StyleAt(startPos);
int style = initStyle;
int iWordSize;
Sci_Position lastStart = 0;
CharacterSet setWord(CharacterSet::setAlphaNum, "_$#@", 0x80, true);
for (Sci_PositionU i = startPos; i < endPos; i++) {
char ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
int stylePrev = style;
style = styleNext;
styleNext = styler.StyleAt(i + 1);
bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
if (foldComment && IsStreamCommentStyle(style)) {
if (!IsStreamCommentStyle(stylePrev)) {
levelCurrent++;
} else if (!IsStreamCommentStyle(styleNext)) {
levelCurrent--;
}
}
if (foldComment && atEOL && IsCommentLine(lineCurrent, styler))
{
if (!IsCommentLine(lineCurrent - 1, styler)
&& IsCommentLine(lineCurrent + 1, styler))
levelCurrent++;
else if (IsCommentLine(lineCurrent - 1, styler)
&& !IsCommentLine(lineCurrent+1, styler))
levelCurrent--;
}
if (foldPreprocessor) {
if (style == SCE_DF_PREPROCESSOR) {
iWordSize = ClassifyDataFlexPreprocessorFoldPoint(levelCurrent, lineFoldStateCurrent, i + 1, styler);
//} else if (style == SCE_DF_PREPROCESSOR2 && ch == '(' && chNext == '*'
// && styler.SafeGetCharAt(i + 2) == '$') {
// ClassifyDataFlexPreprocessorFoldPoint(levelCurrent, lineFoldStateCurrent, i + 3, styler);
i = i + iWordSize;
}
}
if (stylePrev != SCE_DF_SCOPEWORD && style == SCE_DF_SCOPEWORD)
{
// Store last word start point.
lastStart = i;
}
if (stylePrev == SCE_DF_SCOPEWORD) {
if(setWord.Contains(ch) && !setWord.Contains(chNext)) {
ClassifyDataFlexWordFoldPoint(levelCurrent, lineFoldStateCurrent, lastStart, i, keywordlists, styler);
}
}
if (stylePrev == SCE_DF_METATAG && ch == '#')
{
// Store last word start point.
lastStart = i;
}
if (stylePrev == SCE_DF_METATAG) {
if(setWord.Contains(ch) && !setWord.Contains(chNext)) {
ClassifyDataFlexMetaDataFoldPoint(levelCurrent, lastStart, i, keywordlists, styler);
}
}
if (!IsASpace(ch))
visibleChars++;
if (atEOL) {
int lev = levelPrev;
if (visibleChars == 0 && foldCompact)
lev |= SC_FOLDLEVELWHITEFLAG;
if ((levelCurrent > levelPrev) && (visibleChars > 0))
lev |= SC_FOLDLEVELHEADERFLAG;
if (lev != styler.LevelAt(lineCurrent)) {
styler.SetLevel(lineCurrent, lev);
}
int newLineState = (styler.GetLineState(lineCurrent) & ~stateFoldMaskAll) | lineFoldStateCurrent;
styler.SetLineState(lineCurrent, newLineState);
lineCurrent++;
levelPrev = levelCurrent;
visibleChars = 0;
}
}
// If we didn't reach the EOL in previous loop, store line level and whitespace information.
// The rest will be filled in later...
int lev = levelPrev;
if (visibleChars == 0 && foldCompact)
lev |= SC_FOLDLEVELWHITEFLAG;
styler.SetLevel(lineCurrent, lev);
}
static const char * const dataflexWordListDesc[] = {
"Keywords",
"Scope open",
"Scope close",
"Operators",
0
};
extern const LexerModule lmDataflex(SCLEX_DATAFLEX, ColouriseDataFlexDoc, "dataflex", FoldDataFlexDoc, dataflexWordListDesc);