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

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// Scintilla source code edit control
/** @file LexLua.cxx
** Lexer for Lua language.
**
** Written by Paul Winwood.
** Folder by Alexey Yutkin.
** Modified by Marcos E. Wurzius & Philippe Lhoste
**/
#include <cstdlib>
#include <cassert>
#include <cstring>
#include <string>
#include <string_view>
#include <vector>
#include <map>
#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"
#include "OptionSet.h"
#include "SubStyles.h"
#include "DefaultLexer.h"
using namespace Scintilla;
using namespace Lexilla;
namespace {
// Test for [=[ ... ]=] delimiters, returns 0 if it's only a [ or ],
// return 1 for [[ or ]], returns >=2 for [=[ or ]=] and so on.
// The maximum number of '=' characters allowed is 254.
int LongDelimCheck(StyleContext &sc) {
constexpr int maximumEqualCharacters = 254;
int sep = 1;
while (sc.GetRelative(sep) == '=' && sep <= maximumEqualCharacters)
sep++;
if (sc.GetRelative(sep) == sc.ch)
return sep;
return 0;
}
const char *const luaWordListDesc[] = {
"Keywords",
"Basic functions",
"String, (table) & math functions",
"(coroutines), I/O & system facilities",
"user1",
"user2",
"user3",
"user4",
nullptr
};
const char styleSubable[] = { SCE_LUA_IDENTIFIER, 0 };
const LexicalClass lexicalClasses[] = {
// Lexer Lua SCLEX_LUA SCE_LUA_:
0, "SCE_LUA_DEFAULT", "default", "White space: Visible only in View Whitespace mode (or if it has a back colour)",
1, "SCE_LUA_COMMENT", "comment", "Block comment (Lua 5.0)",
2, "SCE_LUA_COMMENTLINE", "comment line", "Line comment",
3, "SCE_LUA_COMMENTDOC", "comment documentation", "Doc comment",
4, "SCE_LUA_NUMBER", "literal numeric", "Number",
5, "SCE_LUA_WORD", "keyword", "Keyword",
6, "SCE_LUA_STRING", "literal string", "(Double quoted) String",
7, "SCE_LUA_CHARACTER", "literal string character", "Character (Single quoted string)",
8, "SCE_LUA_LITERALSTRING", "literal string", "Literal string",
9, "SCE_LUA_PREPROCESSOR", "preprocessor", "Preprocessor (obsolete in Lua 4.0 and up)",
10, "SCE_LUA_OPERATOR", "operator", "Operators",
11, "SCE_LUA_IDENTIFIER", "identifier", "Identifier (everything else...)",
12, "SCE_LUA_STRINGEOL", "error literal string", "End of line where string is not closed",
13, "SCE_LUA_WORD2", "identifier", "Other keywords",
14, "SCE_LUA_WORD3", "identifier", "Other keywords",
15, "SCE_LUA_WORD4", "identifier", "Other keywords",
16, "SCE_LUA_WORD5", "identifier", "Other keywords",
17, "SCE_LUA_WORD6", "identifier", "Other keywords",
18, "SCE_LUA_WORD7", "identifier", "Other keywords",
19, "SCE_LUA_WORD8", "identifier", "Other keywords",
20, "SCE_LUA_LABEL", "label", "Labels",
};
// Options used for LexerLua
struct OptionsLua {
bool foldCompact = true;
};
struct OptionSetLua : public OptionSet<OptionsLua> {
OptionSetLua() {
DefineProperty("fold.compact", &OptionsLua::foldCompact);
DefineWordListSets(luaWordListDesc);
}
};
class LexerLua : public DefaultLexer {
WordList keywords;
WordList keywords2;
WordList keywords3;
WordList keywords4;
WordList keywords5;
WordList keywords6;
WordList keywords7;
WordList keywords8;
OptionsLua options;
OptionSetLua osLua;
SubStyles subStyles{styleSubable};
public:
explicit LexerLua() :
DefaultLexer("lua", SCLEX_LUA, lexicalClasses, std::size(lexicalClasses)) {
}
LexerLua(const LexerLua &) = delete;
LexerLua(LexerLua &&) = delete;
LexerLua &operator=(const LexerLua &) = delete;
LexerLua &operator=(LexerLua &&) = delete;
~LexerLua() override = default;
void SCI_METHOD Release() noexcept override {
delete this;
}
[[nodiscard]] int SCI_METHOD Version() const noexcept override {
return lvRelease5;
}
const char *SCI_METHOD PropertyNames() noexcept override {
return osLua.PropertyNames();
}
int SCI_METHOD PropertyType(const char *name) override {
return osLua.PropertyType(name);
}
const char *SCI_METHOD DescribeProperty(const char *name) override {
return osLua.DescribeProperty(name);
}
Sci_Position SCI_METHOD PropertySet(const char *key, const char *val) override;
const char *SCI_METHOD PropertyGet(const char *key) override {
return osLua.PropertyGet(key);
}
const char *SCI_METHOD DescribeWordListSets() noexcept override {
return osLua.DescribeWordListSets();
}
Sci_Position SCI_METHOD WordListSet(int n, const char *wl) override;
void SCI_METHOD Lex(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) override;
void SCI_METHOD Fold(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) override;
int SCI_METHOD AllocateSubStyles(int styleBase, int numberStyles) override {
return subStyles.Allocate(styleBase, numberStyles);
}
int SCI_METHOD SubStylesStart(int styleBase) override {
return subStyles.Start(styleBase);
}
int SCI_METHOD SubStylesLength(int styleBase) override {
return subStyles.Length(styleBase);
}
int SCI_METHOD StyleFromSubStyle(int subStyle) override {
const int styleBase = subStyles.BaseStyle(subStyle);
return styleBase;
}
int SCI_METHOD PrimaryStyleFromStyle(int style) override {
return style;
}
void SCI_METHOD FreeSubStyles() override {
subStyles.Free();
}
void SCI_METHOD SetIdentifiers(int style, const char *identifiers) override {
subStyles.SetIdentifiers(style, identifiers);
}
int SCI_METHOD DistanceToSecondaryStyles() override {
return 0;
}
const char *SCI_METHOD GetSubStyleBases() override {
return styleSubable;
}
static ILexer5 *LexerFactoryLua() {
return new LexerLua();
}
};
Sci_Position SCI_METHOD LexerLua::PropertySet(const char *key, const char *val) {
if (osLua.PropertySet(&options, key, val)) {
return 0;
}
return -1;
}
Sci_Position SCI_METHOD LexerLua::WordListSet(int n, const char *wl) {
WordList *wordListN = nullptr;
switch (n) {
case 0:
wordListN = &keywords;
break;
case 1:
wordListN = &keywords2;
break;
case 2:
wordListN = &keywords3;
break;
case 3:
wordListN = &keywords4;
break;
case 4:
wordListN = &keywords5;
break;
case 5:
wordListN = &keywords6;
break;
case 6:
wordListN = &keywords7;
break;
case 7:
wordListN = &keywords8;
break;
default:
break;
}
Sci_Position firstModification = -1;
if (wordListN) {
if (wordListN->Set(wl)) {
firstModification = 0;
}
}
return firstModification;
}
constexpr int maskSeparator = 0xFF;
constexpr int maskStringWs = 0x100;
constexpr int maskDocComment = 0x200;
void LexerLua::Lex(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) {
LexAccessor styler(pAccess);
// Accepts accented characters
const CharacterSet setWordStart(CharacterSet::setAlpha, "_", true);
const CharacterSet setWord(CharacterSet::setAlphaNum, "_", true);
// Not exactly following number definition (several dots are seen as OK, etc.)
// but probably enough in most cases. [pP] is for hex floats.
const CharacterSet setNumber(CharacterSet::setDigits, ".-+abcdefpABCDEFP");
const CharacterSet setExponent("eEpP");
const CharacterSet setLuaOperator("*/-+()={}~[];<>,.^%:#&|");
const CharacterSet setEscapeSkip("\"'\\");
const WordClassifier &classifierIdentifiers = subStyles.Classifier(SCE_LUA_IDENTIFIER);
Sci_Position currentLine = styler.GetLine(startPos);
// Initialize long string [[ ... ]] or block comment --[[ ... ]],
// if we are inside such a string. Block comment was introduced in Lua 5.0,
// blocks with separators [=[ ... ]=] in Lua 5.1.
// Continuation of a string (\z whitespace escaping) is controlled by stringWs.
int sepCount = 0;
int stringWs = 0;
int lastLineDocComment = 0;
if ((currentLine > 0) &&
AnyOf(initStyle, SCE_LUA_DEFAULT, SCE_LUA_LITERALSTRING, SCE_LUA_COMMENT, SCE_LUA_COMMENTDOC, SCE_LUA_STRING, SCE_LUA_CHARACTER)) {
const int lineState = styler.GetLineState(currentLine - 1);
sepCount = lineState & maskSeparator;
stringWs = lineState & maskStringWs;
lastLineDocComment = lineState & maskDocComment;
}
// results of identifier/keyword matching
Sci_Position idenPos = 0;
Sci_Position idenStartCharWidth = 0;
Sci_Position idenWordPos = 0;
int idenStyle = SCE_LUA_IDENTIFIER;
bool foundGoto = false;
// Do not leak onto next line
if (AnyOf(initStyle, SCE_LUA_STRINGEOL, SCE_LUA_COMMENTLINE, SCE_LUA_COMMENTDOC, SCE_LUA_PREPROCESSOR)) {
initStyle = SCE_LUA_DEFAULT;
}
StyleContext sc(startPos, length, initStyle, styler);
if (startPos == 0 && sc.ch == '#' && sc.chNext == '!') {
// shbang line: "#!" is a comment only if located at the start of the script
sc.SetState(SCE_LUA_COMMENTLINE);
}
for (; sc.More(); sc.Forward()) {
if (sc.atLineEnd) {
// Update the line state, so it can be seen by next line
currentLine = styler.GetLine(sc.currentPos);
switch (sc.state) {
case SCE_LUA_DEFAULT:
case SCE_LUA_LITERALSTRING:
case SCE_LUA_COMMENT:
case SCE_LUA_COMMENTDOC:
case SCE_LUA_STRING:
case SCE_LUA_CHARACTER:
// Inside a literal string, block comment or string, we set the line state
styler.SetLineState(currentLine, lastLineDocComment | stringWs | sepCount);
break;
default:
// Reset the line state
styler.SetLineState(currentLine, 0);
break;
}
}
if (sc.atLineStart && (sc.state == SCE_LUA_STRING)) {
// Prevent SCE_LUA_STRINGEOL from leaking back to previous line
sc.SetState(SCE_LUA_STRING);
}
// Handle string line continuation
if ((sc.state == SCE_LUA_STRING || sc.state == SCE_LUA_CHARACTER) &&
sc.ch == '\\') {
if (sc.chNext == '\n' || sc.chNext == '\r') {
sc.Forward();
if (sc.ch == '\r' && sc.chNext == '\n') {
sc.Forward();
}
continue;
}
}
// Determine if the current state should terminate.
if (sc.state == SCE_LUA_OPERATOR) {
if (sc.ch == ':' && sc.chPrev == ':') { // :: <label> :: forward scan
sc.Forward();
Sci_Position ln = 0;
while (IsASpaceOrTab(sc.GetRelativeChar(ln))) // skip over spaces/tabs
ln++;
const Sci_Position ws1 = ln;
if (setWordStart.Contains(sc.GetRelativeChar(ln))) {
char cLabel = 0;
std::string s;
while (setWord.Contains(cLabel = sc.GetRelativeChar(ln))) { // get potential label
s.push_back(cLabel);
ln++;
}
const Sci_Position lbl = ln;
if (!keywords.InList(s)) {
while (IsASpaceOrTab(sc.GetRelativeChar(ln))) // skip over spaces/tabs
ln++;
const Sci_Position ws2 = ln - lbl;
if (sc.GetRelativeChar(ln) == ':' && sc.GetRelativeChar(ln + 1) == ':') {
// final :: found, complete valid label construct
sc.ChangeState(SCE_LUA_LABEL);
if (ws1) {
sc.SetState(SCE_LUA_DEFAULT);
sc.ForwardBytes(ws1);
}
sc.SetState(SCE_LUA_LABEL);
sc.ForwardBytes(lbl - ws1);
if (ws2) {
sc.SetState(SCE_LUA_DEFAULT);
sc.ForwardBytes(ws2);
}
sc.SetState(SCE_LUA_LABEL);
sc.ForwardBytes(2);
}
}
}
}
sc.SetState(SCE_LUA_DEFAULT);
} else if (sc.state == SCE_LUA_NUMBER) {
// We stop the number definition on non-numerical non-dot non-eEpP non-sign non-hexdigit char
if (!setNumber.Contains(sc.ch)) {
sc.SetState(SCE_LUA_DEFAULT);
} else if (sc.ch == '-' || sc.ch == '+') {
if (!setExponent.Contains(sc.chPrev))
sc.SetState(SCE_LUA_DEFAULT);
}
} else if (sc.state == SCE_LUA_IDENTIFIER) {
idenPos -= idenStartCharWidth; // commit already-scanned identifier/word parts
if (idenWordPos > 0) {
idenWordPos--;
sc.ChangeState(idenStyle);
sc.ForwardBytes(idenWordPos);
idenPos -= idenWordPos;
if (idenPos > 0) {
sc.SetState(SCE_LUA_IDENTIFIER);
sc.ForwardBytes(idenPos);
}
} else {
sc.ForwardBytes(idenPos);
}
sc.SetState(SCE_LUA_DEFAULT);
if (foundGoto) { // goto <label> forward scan
while (IsASpaceOrTab(sc.ch) && !sc.atLineEnd)
sc.Forward();
if (setWordStart.Contains(sc.ch)) {
sc.SetState(SCE_LUA_LABEL);
sc.Forward();
while (setWord.Contains(sc.ch))
sc.Forward();
std::string s;
sc.GetCurrentString(s, StyleContext::Transform::none);
if (keywords.InList(s)) // labels cannot be keywords
sc.ChangeState(SCE_LUA_WORD);
}
sc.SetState(SCE_LUA_DEFAULT);
}
} else if (AnyOf(sc.state, SCE_LUA_COMMENTLINE, SCE_LUA_COMMENTDOC, SCE_LUA_PREPROCESSOR)) {
if (sc.atLineEnd) {
sc.ForwardSetState(SCE_LUA_DEFAULT);
}
} else if (sc.state == SCE_LUA_STRING) {
if (stringWs) {
if (!IsASpace(sc.ch))
stringWs = 0;
}
if (sc.ch == '\\') {
if (setEscapeSkip.Contains(sc.chNext)) {
sc.Forward();
} else if (sc.chNext == 'z') {
sc.Forward();
stringWs = maskStringWs;
}
} else if (sc.ch == '\"') {
sc.ForwardSetState(SCE_LUA_DEFAULT);
} else if (stringWs == 0 && sc.atLineEnd) {
sc.ChangeState(SCE_LUA_STRINGEOL);
sc.ForwardSetState(SCE_LUA_DEFAULT);
}
} else if (sc.state == SCE_LUA_CHARACTER) {
if (stringWs) {
if (!IsASpace(sc.ch))
stringWs = 0;
}
if (sc.ch == '\\') {
if (setEscapeSkip.Contains(sc.chNext)) {
sc.Forward();
} else if (sc.chNext == 'z') {
sc.Forward();
stringWs = maskStringWs;
}
} else if (sc.ch == '\'') {
sc.ForwardSetState(SCE_LUA_DEFAULT);
} else if (stringWs == 0 && sc.atLineEnd) {
sc.ChangeState(SCE_LUA_STRINGEOL);
sc.ForwardSetState(SCE_LUA_DEFAULT);
}
} else if (sc.ch == ']' && (sc.state == SCE_LUA_LITERALSTRING || sc.state == SCE_LUA_COMMENT)) {
const int sep = LongDelimCheck(sc);
if (sep == sepCount) { // ]=]-style delim
sc.Forward(sep);
sc.ForwardSetState(SCE_LUA_DEFAULT);
}
}
// Determine if a new state should be entered.
if (sc.state == SCE_LUA_DEFAULT) {
if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
sc.SetState(SCE_LUA_NUMBER);
if (sc.ch == '0' && AnyOf(sc.chNext, 'x', 'X')) {
sc.Forward();
}
} else if (setWordStart.Contains(sc.ch)) {
// For matching various identifiers with dots and colons, multiple
// matches are done as identifier segments are added. Longest match is
// set to a word style. The non-matched part is in identifier style.
std::string ident;
idenPos = 0;
idenStartCharWidth = sc.width;
idenWordPos = 0;
idenStyle = SCE_LUA_IDENTIFIER;
foundGoto = false;
char cNext = 0;
do {
char cIdent = 0;
const Sci_Position idenPosOld = idenPos;
std::string identSeg;
identSeg += sc.GetRelativeChar(idenPos++);
while (setWord.Contains(cIdent = sc.GetRelativeChar(idenPos))) {
identSeg += cIdent;
idenPos++;
}
if (keywords.InList(identSeg) && (idenPosOld > 0)) {
idenPos = idenPosOld - 1; // keywords cannot mix
ident.pop_back();
break;
}
ident += identSeg;
int newStyle = SCE_LUA_IDENTIFIER;
if (keywords.InList(ident)) {
newStyle = SCE_LUA_WORD;
} else if (keywords2.InList(ident)) {
newStyle = SCE_LUA_WORD2;
} else if (keywords3.InList(ident)) {
newStyle = SCE_LUA_WORD3;
} else if (keywords4.InList(ident)) {
newStyle = SCE_LUA_WORD4;
} else if (keywords5.InList(ident)) {
newStyle = SCE_LUA_WORD5;
} else if (keywords6.InList(ident)) {
newStyle = SCE_LUA_WORD6;
} else if (keywords7.InList(ident)) {
newStyle = SCE_LUA_WORD7;
} else if (keywords8.InList(ident)) {
newStyle = SCE_LUA_WORD8;
} else {
const int subStyle = classifierIdentifiers.ValueFor(ident);
if (subStyle >= 0) {
newStyle = subStyle;
}
}
if (newStyle != SCE_LUA_IDENTIFIER) {
idenStyle = newStyle;
idenWordPos = idenPos;
}
if (idenStyle == SCE_LUA_WORD) // keywords cannot mix
break;
cNext = sc.GetRelativeChar(idenPos + 1);
if ((cIdent == '.' || cIdent == ':') && setWordStart.Contains(cNext)) {
ident += cIdent;
idenPos++;
} else {
cNext = 0;
}
} while (cNext);
if ((idenStyle == SCE_LUA_WORD) && (ident == "goto")) {
foundGoto = true;
}
sc.SetState(SCE_LUA_IDENTIFIER);
} else if (sc.ch == '\"') {
sc.SetState(SCE_LUA_STRING);
stringWs = 0;
} else if (sc.ch == '\'') {
sc.SetState(SCE_LUA_CHARACTER);
stringWs = 0;
} else if (sc.ch == '[') {
sepCount = LongDelimCheck(sc);
if (sepCount == 0) {
sc.SetState(SCE_LUA_OPERATOR);
} else {
sc.SetState(SCE_LUA_LITERALSTRING);
sc.Forward(sepCount);
}
} else if (sc.Match('-', '-')) {
sc.SetState(lastLineDocComment ? SCE_LUA_COMMENTDOC : SCE_LUA_COMMENTLINE);
if (sc.Match("--[")) {
sc.Forward(2);
sepCount = LongDelimCheck(sc);
if (sepCount > 0) {
sc.ChangeState(SCE_LUA_COMMENT);
sc.Forward(sepCount);
}
} else if (sc.Match("---")) {
sc.SetState(SCE_LUA_COMMENTDOC);
lastLineDocComment = maskDocComment;
} else {
sc.Forward();
}
} else if (sc.atLineStart && sc.Match('$')) {
sc.SetState(SCE_LUA_PREPROCESSOR); // Obsolete since Lua 4.0, but still in old code
} else if (setLuaOperator.Contains(sc.ch)) {
sc.SetState(SCE_LUA_OPERATOR);
}
if (!AnyOf(sc.state, SCE_LUA_DEFAULT, SCE_LUA_COMMENTDOC)) {
lastLineDocComment = 0;
}
}
}
sc.Complete();
}
void LexerLua::Fold(Sci_PositionU startPos_, Sci_Position length, int initStyle, IDocument *pAccess) {
LexAccessor styler(pAccess);
const Sci_Position startPos = startPos_;
const Sci_Position lengthDoc = startPos + length;
int visibleChars = 0;
Sci_Position lineCurrent = styler.GetLine(startPos);
int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
int levelCurrent = levelPrev;
char chNext = styler[startPos];
const bool foldCompact = options.foldCompact;
int style = initStyle;
int styleNext = styler.StyleIndexAt(startPos);
for (Sci_Position i = startPos; i < lengthDoc; i++) {
const char ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
const int stylePrev = style;
style = styleNext;
if ((i + 1) < lengthDoc) {
// Only read styles that have been set, otherwise treat style as continuing
styleNext = styler.StyleIndexAt(i + 1);
}
const bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
if (style == SCE_LUA_WORD) {
// Fixed list of folding words: if, do, function, repeat, end, until
// Must fix up next line with initial characters if any new words added.
if ((style != stylePrev) && AnyOf(ch, 'i', 'd', 'f', 'e', 'r', 'u')) {
constexpr Sci_Position maxFoldWord = 9; // "function"sv.length() + 1
std::string s;
for (Sci_Position j = 0; j < maxFoldWord; j++) {
if (!iswordchar(styler[i + j])) {
break;
}
s.push_back(styler[i + j]);
}
if (s == "if" || s == "do" || s == "function" || s == "repeat") {
levelCurrent++;
}
if (s == "end" || s == "until") {
levelCurrent--;
}
}
} else if (style == SCE_LUA_OPERATOR) {
if (ch == '{' || ch == '(') {
levelCurrent++;
} else if (ch == '}' || ch == ')') {
levelCurrent--;
}
} else if (style == SCE_LUA_LITERALSTRING || style == SCE_LUA_COMMENT) {
if (stylePrev != style) {
levelCurrent++;
} else if (styleNext != style) {
levelCurrent--;
}
}
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);
}
lineCurrent++;
levelPrev = levelCurrent;
visibleChars = 0;
}
if (!isspacechar(ch)) {
visibleChars++;
}
}
// Fill in the real level of the next line, keeping the current flags as they will be filled in later
const int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
styler.SetLevel(lineCurrent, levelPrev | flagsNext);
}
}
extern const LexerModule lmLua(SCLEX_LUA, LexerLua::LexerFactoryLua, "lua", luaWordListDesc);