--- /dev/null
+// 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 "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"
+
+#ifdef SCI_NAMESPACE
+using namespace Scintilla;
+#endif
+
+// 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(
+ unsigned int startPos,
+ int length,
+ int initStyle,
+ WordList *keywordlists[],
+ Accessor &styler) {
+
+ WordList &keywords = *keywordlists[0];
+ WordList &keywords2 = *keywordlists[1];
+ WordList &keywords3 = *keywordlists[2];
+ WordList &keywords4 = *keywordlists[3];
+ WordList &keywords5 = *keywordlists[4];
+ WordList &keywords6 = *keywordlists[5];
+ WordList &keywords7 = *keywordlists[6];
+ 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, "\"'\\");
+
+ int 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) {
+ int lineState = styler.GetLineState(currentLine - 1);
+ nestLevel = lineState >> 9;
+ sepCount = lineState & 0xFF;
+ stringWs = lineState & 0x100;
+ }
+
+ // 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 == '#') {
+ // shbang line: # is a comment only if first char 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();
+ int ln = 0, maxln = startPos + length - sc.currentPos;
+ int c;
+ while (ln < maxln) { // determine line extent
+ c = sc.GetRelative(ln);
+ if (c == '\r' || c == '\n')
+ break;
+ ln++;
+ }
+ maxln = ln; ln = 0;
+ while (ln < maxln) { // skip over spaces/tabs
+ if (!IsASpaceOrTab(sc.GetRelative(ln)))
+ break;
+ ln++;
+ }
+ int ws1 = ln;
+ if (setWordStart.Contains(sc.GetRelative(ln))) {
+ int i = 0;
+ char s[100];
+ while (ln < maxln) { // get potential label
+ c = sc.GetRelative(ln);
+ if (!setWord.Contains(c))
+ break;
+ if (i < 90)
+ s[i++] = c;
+ ln++;
+ }
+ s[i] = '\0'; int lbl = ln;
+ if (!keywords.InList(s)) {
+ while (ln < maxln) { // skip over spaces/tabs
+ if (!IsASpaceOrTab(sc.GetRelative(ln)))
+ break;
+ ln++;
+ }
+ int 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.Forward(ws1);
+ }
+ sc.SetState(SCE_LUA_LABEL);
+ sc.Forward(lbl - ws1);
+ if (ws2) {
+ sc.SetState(SCE_LUA_DEFAULT);
+ sc.Forward(ws2);
+ }
+ sc.SetState(SCE_LUA_LABEL);
+ sc.Forward(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) {
+ if (!(setWord.Contains(sc.ch) || sc.ch == '.') || sc.Match('.', '.')) {
+ char s[100];
+ sc.GetCurrent(s, sizeof(s));
+ if (keywords.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD);
+ if (strcmp(s, "goto") == 0) { // goto <label> forward scan
+ sc.SetState(SCE_LUA_DEFAULT);
+ 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();
+ sc.GetCurrent(s, sizeof(s));
+ if (keywords.InList(s))
+ sc.ChangeState(SCE_LUA_WORD);
+ }
+ sc.SetState(SCE_LUA_DEFAULT);
+ }
+ } else if (keywords2.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD2);
+ } else if (keywords3.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD3);
+ } else if (keywords4.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD4);
+ } else if (keywords5.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD5);
+ } else if (keywords6.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD6);
+ } else if (keywords7.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD7);
+ } else if (keywords8.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD8);
+ }
+ 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 == '[') {
+ 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)) {
+ 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);
+ }
+ }
+ }
+
+ if (setWord.Contains(sc.chPrev) || sc.chPrev == '.') {
+ char s[100];
+ sc.GetCurrent(s, sizeof(s));
+ if (keywords.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD);
+ } else if (keywords2.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD2);
+ } else if (keywords3.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD3);
+ } else if (keywords4.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD4);
+ } else if (keywords5.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD5);
+ } else if (keywords6.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD6);
+ } else if (keywords7.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD7);
+ } else if (keywords8.InList(s)) {
+ sc.ChangeState(SCE_LUA_WORD8);
+ }
+ }
+
+ sc.Complete();
+}
+
+static void FoldLuaDoc(unsigned int startPos, int length, int /* initStyle */, WordList *[],
+ Accessor &styler) {
+ unsigned int lengthDoc = startPos + length;
+ int visibleChars = 0;
+ int lineCurrent = styler.GetLine(startPos);
+ int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
+ int levelCurrent = levelPrev;
+ char chNext = styler[startPos];
+ bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
+ int styleNext = styler.StyleAt(startPos);
+ char s[10];
+
+ for (unsigned int i = startPos; i < lengthDoc; i++) {
+ char ch = chNext;
+ chNext = styler.SafeGetCharAt(i + 1);
+ int style = styleNext;
+ styleNext = styler.StyleAt(i + 1);
+ 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') {
+ for (unsigned int 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
+};
+
+LexerModule lmLua(SCLEX_LUA, ColouriseLuaDoc, "lua", FoldLuaDoc, luaWordListDesc);
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