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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 <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <fcntl.h>
#include "Platform.h"
#include "PropSet.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "KeyWords.h"
#include "Scintilla.h"
#include "SciLexer.h"
#define SCE_LUA_LAST_STYLE SCE_LUA_WORD6
static inline bool IsAWordChar(const int ch) {
return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_');
}
inline bool IsAWordStart(const int ch) {
return (ch < 0x80) && (isalnum(ch) || ch == '_');
}
inline bool isLuaOperator(char ch) {
if (isalnum(ch))
return false;
// '.' left out as it is used to make up numbers
if (ch == '*' || ch == '/' || ch == '-' || ch == '+' ||
ch == '(' || ch == ')' || ch == '=' ||
ch == '{' || ch == '}' || ch == '~' ||
ch == '[' || ch == ']' || ch == ';' ||
ch == '<' || ch == '>' || ch == ',' ||
ch == '.' || ch == '^' || ch == '%' || ch == ':')
return true;
return false;
}
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];
// Must initialize the literal string nesting level, if we are inside such a string.
int literalStringLevel = 0;
if (initStyle == SCE_LUA_LITERALSTRING) {
literalStringLevel = 1;
}
// We use states above the last one to indicate nesting level of literal strings
if (initStyle > SCE_LUA_LAST_STYLE) {
literalStringLevel = initStyle - SCE_LUA_LAST_STYLE + 1;
}
// Do not leak onto next line
if (initStyle == SCE_LUA_STRINGEOL) {
initStyle = SCE_LUA_DEFAULT;
}
StyleContext sc(startPos, length, initStyle, styler);
if (startPos == 0 && sc.ch == '#') {
sc.SetState(SCE_LUA_COMMENTLINE);
}
for (; sc.More(); sc.Forward()) {
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) {
sc.SetState(SCE_LUA_DEFAULT);
} else if (sc.state == SCE_LUA_NUMBER) {
if (!IsAWordChar(sc.ch)) {
sc.SetState(SCE_LUA_DEFAULT);
}
} else if (sc.state == SCE_LUA_IDENTIFIER) {
if (!IsAWordChar(sc.ch) || (sc.ch == '.')) {
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);
}
sc.SetState(SCE_LUA_DEFAULT);
}
} else if (sc.state == SCE_LUA_COMMENTLINE ) {
if (sc.atLineEnd) {
sc.SetState(SCE_LUA_DEFAULT);
}
} else if (sc.state == SCE_LUA_PREPROCESSOR ) {
if (sc.atLineEnd) {
sc.SetState(SCE_LUA_DEFAULT);
}
} else if (sc.state == SCE_LUA_STRING) {
if (sc.ch == '\\') {
if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
sc.Forward();
}
} else if (sc.ch == '\"') {
sc.ForwardSetState(SCE_LUA_DEFAULT);
} else if (sc.atLineEnd) {
sc.ChangeState(SCE_LUA_STRINGEOL);
sc.ForwardSetState(SCE_LUA_DEFAULT);
}
} else if (sc.state == SCE_LUA_CHARACTER) {
if (sc.ch == '\\') {
if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
sc.Forward();
}
} else if (sc.ch == '\'') {
sc.ForwardSetState(SCE_LUA_DEFAULT);
} else if (sc.atLineEnd) {
sc.ChangeState(SCE_LUA_STRINGEOL);
sc.ForwardSetState(SCE_LUA_DEFAULT);
}
} else if (sc.state == SCE_LUA_LITERALSTRING || sc.state > SCE_LUA_LAST_STYLE) {
if (sc.Match('[', '[')) {
literalStringLevel++;
sc.SetState(SCE_LUA_LAST_STYLE + literalStringLevel - 1);
} else if (sc.Match(']', ']') && literalStringLevel > 0) {
literalStringLevel--;
sc.Forward();
if (literalStringLevel == 0) {
sc.ForwardSetState(SCE_LUA_DEFAULT);
} else if (literalStringLevel == 1) {
sc.ForwardSetState(SCE_LUA_LITERALSTRING);
} else {
sc.ForwardSetState(SCE_LUA_LAST_STYLE + literalStringLevel - 1);
}
}
}
// 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);
} else if (IsAWordStart(sc.ch)) {
sc.SetState(SCE_LUA_IDENTIFIER);
} else if (sc.Match('\"')) {
sc.SetState(SCE_LUA_STRING);
} else if (sc.Match('\'')) {
sc.SetState(SCE_LUA_CHARACTER);
} else if (sc.Match('[', '[')) {
literalStringLevel = 1;
sc.SetState(SCE_LUA_LITERALSTRING);
sc.Forward();
} else if (sc.Match('-', '-')) {
sc.SetState(SCE_LUA_COMMENTLINE);
sc.Forward();
} else if (sc.Match('$') && sc.atLineStart) {
sc.SetState(SCE_LUA_PREPROCESSOR); // Obsolete since Lua 4.0, but still in old code
} else if (isLuaOperator(static_cast<char>(sc.ch))) {
sc.SetState(SCE_LUA_OPERATOR);
}
}
}
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') {
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)) {
levelCurrent++;
}
if ((strcmp(s, "end") == 0) || (strcmp(s, "elseif") == 0)) {
levelCurrent--;
}
}
} else if (style == SCE_LUA_OPERATOR) {
if (ch == '{' || ch == '(') {
levelCurrent++;
} else if (ch == '}' || 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);
}
LexerModule lmLua(SCLEX_LUA, ColouriseLuaDoc, "lua", FoldLuaDoc);
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