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-rw-r--r--lexers/LexLua.cxx502
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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 <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <assert.h>
-#include <ctype.h>
-
-#include <string>
-
-#include "ILexer.h"
-#include "Scintilla.h"
-#include "SciLexer.h"
-
-#include "StringCopy.h"
-#include "WordList.h"
-#include "LexAccessor.h"
-#include "Accessor.h"
-#include "StyleContext.h"
-#include "CharacterSet.h"
-#include "LexerModule.h"
-
-using namespace Scintilla;
-
-// 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.
-static int LongDelimCheck(StyleContext &sc) {
- int sep = 1;
- while (sc.GetRelative(sep) == '=' && sep < 0xFF)
- sep++;
- if (sc.GetRelative(sep) == sc.ch)
- return sep;
- return 0;
-}
-
-static void ColouriseLuaDoc(
- Sci_PositionU startPos,
- Sci_Position length,
- int initStyle,
- WordList *keywordlists[],
- Accessor &styler) {
-
- const WordList &keywords = *keywordlists[0];
- const WordList &keywords2 = *keywordlists[1];
- const WordList &keywords3 = *keywordlists[2];
- const WordList &keywords4 = *keywordlists[3];
- const WordList &keywords5 = *keywordlists[4];
- const WordList &keywords6 = *keywordlists[5];
- const WordList &keywords7 = *keywordlists[6];
- const WordList &keywords8 = *keywordlists[7];
-
- // Accepts accented characters
- CharacterSet setWordStart(CharacterSet::setAlpha, "_", 0x80, true);
- CharacterSet setWord(CharacterSet::setAlphaNum, "_", 0x80, true);
- // Not exactly following number definition (several dots are seen as OK, etc.)
- // but probably enough in most cases. [pP] is for hex floats.
- CharacterSet setNumber(CharacterSet::setDigits, ".-+abcdefpABCDEFP");
- CharacterSet setExponent(CharacterSet::setNone, "eEpP");
- CharacterSet setLuaOperator(CharacterSet::setNone, "*/-+()={}~[];<>,.^%:#&|");
- CharacterSet setEscapeSkip(CharacterSet::setNone, "\"'\\");
-
- Sci_Position currentLine = styler.GetLine(startPos);
- // Initialize long string [[ ... ]] or block comment --[[ ... ]] nesting level,
- // 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 nestLevel = 0;
- int sepCount = 0;
- int stringWs = 0;
- if (initStyle == SCE_LUA_LITERALSTRING || initStyle == SCE_LUA_COMMENT ||
- initStyle == SCE_LUA_STRING || initStyle == SCE_LUA_CHARACTER) {
- const int lineState = styler.GetLineState(currentLine - 1);
- nestLevel = lineState >> 9;
- sepCount = lineState & 0xFF;
- stringWs = lineState & 0x100;
- }
-
- // results of identifier/keyword matching
- Sci_Position idenPos = 0;
- Sci_Position idenWordPos = 0;
- int idenStyle = SCE_LUA_IDENTIFIER;
- bool foundGoto = false;
-
- // Do not leak onto next line
- if (initStyle == SCE_LUA_STRINGEOL || initStyle == SCE_LUA_COMMENTLINE || initStyle == 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_LITERALSTRING:
- case SCE_LUA_COMMENT:
- case SCE_LUA_STRING:
- case SCE_LUA_CHARACTER:
- // Inside a literal string, block comment or string, we set the line state
- styler.SetLineState(currentLine, (nestLevel << 9) | 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.GetRelative(ln))) // skip over spaces/tabs
- ln++;
- Sci_Position ws1 = ln;
- if (setWordStart.Contains(sc.GetRelative(ln))) {
- int c, i = 0;
- char s[100];
- while (setWord.Contains(c = sc.GetRelative(ln))) { // get potential label
- if (i < 90)
- s[i++] = static_cast<char>(c);
- ln++;
- }
- s[i] = '\0'; Sci_Position lbl = ln;
- if (!keywords.InList(s)) {
- while (IsASpaceOrTab(sc.GetRelative(ln))) // skip over spaces/tabs
- ln++;
- Sci_Position ws2 = ln - lbl;
- if (sc.GetRelative(ln) == ':' && sc.GetRelative(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--; // commit already-scanned identitier/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();
- char s[100];
- sc.GetCurrent(s, sizeof(s));
- if (keywords.InList(s)) // labels cannot be keywords
- sc.ChangeState(SCE_LUA_WORD);
- }
- sc.SetState(SCE_LUA_DEFAULT);
- }
- } else if (sc.state == SCE_LUA_COMMENTLINE || sc.state == 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 = 0x100;
- }
- } 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 = 0x100;
- }
- } 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_LITERALSTRING || sc.state == SCE_LUA_COMMENT) {
- if (sc.ch == '[') {
- const int sep = LongDelimCheck(sc);
- if (sep == 1 && sepCount == 1) { // [[-only allowed to nest
- nestLevel++;
- sc.Forward();
- }
- } else if (sc.ch == ']') {
- int sep = LongDelimCheck(sc);
- if (sep == 1 && sepCount == 1) { // un-nest with ]]-only
- nestLevel--;
- sc.Forward();
- if (nestLevel == 0) {
- sc.ForwardSetState(SCE_LUA_DEFAULT);
- }
- } else if (sep > 1 && 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' && toupper(sc.chNext) == '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;
- idenWordPos = 0;
- idenStyle = SCE_LUA_IDENTIFIER;
- foundGoto = false;
- int cNext;
- do {
- int c;
- const Sci_Position idenPosOld = idenPos;
- std::string identSeg;
- identSeg += static_cast<char>(sc.GetRelative(idenPos++));
- while (setWord.Contains(c = sc.GetRelative(idenPos))) {
- identSeg += static_cast<char>(c);
- idenPos++;
- }
- if (keywords.InList(identSeg.c_str()) && (idenPosOld > 0)) {
- idenPos = idenPosOld - 1; // keywords cannot mix
- ident.pop_back();
- break;
- }
- ident += identSeg;
- const char* s = ident.c_str();
- int newStyle = SCE_LUA_IDENTIFIER;
- if (keywords.InList(s)) {
- newStyle = SCE_LUA_WORD;
- } else if (keywords2.InList(s)) {
- newStyle = SCE_LUA_WORD2;
- } else if (keywords3.InList(s)) {
- newStyle = SCE_LUA_WORD3;
- } else if (keywords4.InList(s)) {
- newStyle = SCE_LUA_WORD4;
- } else if (keywords5.InList(s)) {
- newStyle = SCE_LUA_WORD5;
- } else if (keywords6.InList(s)) {
- newStyle = SCE_LUA_WORD6;
- } else if (keywords7.InList(s)) {
- newStyle = SCE_LUA_WORD7;
- } else if (keywords8.InList(s)) {
- newStyle = SCE_LUA_WORD8;
- }
- if (newStyle != SCE_LUA_IDENTIFIER) {
- idenStyle = newStyle;
- idenWordPos = idenPos;
- }
- if (idenStyle == SCE_LUA_WORD) // keywords cannot mix
- break;
- cNext = sc.GetRelative(idenPos + 1);
- if ((c == '.' || c == ':') && setWordStart.Contains(cNext)) {
- ident += static_cast<char>(c);
- idenPos++;
- } else {
- cNext = 0;
- }
- } while (cNext);
- if ((idenStyle == SCE_LUA_WORD) && (ident.compare("goto") == 0)) {
- 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 {
- nestLevel = 1;
- sc.SetState(SCE_LUA_LITERALSTRING);
- sc.Forward(sepCount);
- }
- } else if (sc.Match('-', '-')) {
- sc.SetState(SCE_LUA_COMMENTLINE);
- if (sc.Match("--[")) {
- sc.Forward(2);
- sepCount = LongDelimCheck(sc);
- if (sepCount > 0) {
- nestLevel = 1;
- sc.ChangeState(SCE_LUA_COMMENT);
- sc.Forward(sepCount);
- }
- } 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);
- }
- }
- }
-
- sc.Complete();
-}
-
-static void FoldLuaDoc(Sci_PositionU startPos, Sci_Position length, int /* initStyle */, WordList *[],
- Accessor &styler) {
- const Sci_PositionU 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 = styler.GetPropertyInt("fold.compact", 1) != 0;
- int styleNext = styler.StyleAt(startPos);
-
- for (Sci_PositionU i = startPos; i < lengthDoc; i++) {
- const char ch = chNext;
- chNext = styler.SafeGetCharAt(i + 1);
- const int style = styleNext;
- styleNext = styler.StyleAt(i + 1);
- const bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
- if (style == SCE_LUA_WORD) {
- if (ch == 'i' || ch == 'd' || ch == 'f' || ch == 'e' || ch == 'r' || ch == 'u') {
- char s[10] = "";
- for (Sci_PositionU j = 0; j < 8; j++) {
- if (!iswordchar(styler[i + j])) {
- break;
- }
- s[j] = styler[i + j];
- s[j + 1] = '\0';
- }
-
- if ((strcmp(s, "if") == 0) || (strcmp(s, "do") == 0) || (strcmp(s, "function") == 0) || (strcmp(s, "repeat") == 0)) {
- levelCurrent++;
- }
- if ((strcmp(s, "end") == 0) || (strcmp(s, "elseif") == 0) || (strcmp(s, "until") == 0)) {
- 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 (ch == '[') {
- levelCurrent++;
- } else if (ch == ']') {
- 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
-
- int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
- styler.SetLevel(lineCurrent, levelPrev | flagsNext);
-}
-
-static const char * const luaWordListDesc[] = {
- "Keywords",
- "Basic functions",
- "String, (table) & math functions",
- "(coroutines), I/O & system facilities",
- "user1",
- "user2",
- "user3",
- "user4",
- 0
-};
-
-namespace {
-
-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 -- Not used in Lua (yet?)",
- 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",
-};
-
-}
-
-LexerModule lmLua(SCLEX_LUA, ColouriseLuaDoc, "lua", FoldLuaDoc, luaWordListDesc, lexicalClasses, ELEMENTS(lexicalClasses));
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-12 17:54:02 +0000