#include "latexpackage.h"
#include "latexcompleter_config.h"
#include "latexparser/latexparser.h"
#include "tablemanipulation.h"


CommandDescription extractCommandDef(QString line, QString definition);
CommandDescription extractCommandDefKeyVal(QString line, QString &key);


LatexPackage::LatexPackage() : notFound(false)
{
	completionWords.clear();
	packageName.clear();
}

QString LatexPackage::makeKey(const QString &cwlFilename, const QString &options)
{
	return QString("%1#%2").arg(options).arg(cwlFilename);
}

QString LatexPackage::keyToCwlFilename(const QString &key)
{
	int i = key.indexOf('#');
	if (i < 0) return key;
	else return key.mid(i + 1);
}

QString LatexPackage::keyToPackageName(const QString &key)
{
	// Workaround since there is currently no reliable way to determine the packageName from LatexPackage directly (the attribute with the same name contains the key and sometimes nothing).
	QString name = LatexPackage::keyToCwlFilename(key);
	if (name.endsWith(".cwl"))
		name.remove(name.length() - 4, 4);
	if (name.startsWith("class-"))
		name.remove(0, 6);
	return name;
}

QStringList LatexPackage::keyToOptions(const QString &key)
{
	int i = key.indexOf('#');
	if (i < 0) return QStringList();
	QString zw = key.left(i);
	QStringList result = zw.split(',');
	for (int k = 0; k < result.size(); k++) {
		QString elem = result.value(k);
		if (elem.contains('%')) {
			i = elem.indexOf('%');
			elem = elem.left(i);
		}
		elem = elem.simplified();
        elem = elem.remove(QChar(' '));
		result[k] = elem;
	}
	return result;
}

void LatexPackage::unite(LatexPackage &add, bool forCompletion)
{
	if (forCompletion) {
		completionWords.unite(add.completionWords); //expensive
		return;
	}
	optionCommands.unite(add.optionCommands);
	environmentAliases.unite(add.environmentAliases);
#if (QT_VERSION<QT_VERSION_CHECK(5,15,0))
    specialDefCommands.unite(add.specialDefCommands);
#else
    specialDefCommands.insert(add.specialDefCommands);
#endif
	commandDescriptions.unite(add.commandDescriptions); // overloaded unit, which does not overwrite well defined CDs with poorly defined ones

	//possibleCommands.unite(add.possibleCommands);
	foreach (const QString &elem, add.possibleCommands.keys()) { //expensive
		QSet<QString> set2 = add.possibleCommands[elem];
		QSet<QString> set = possibleCommands[elem];
		set.unite(set2);
		possibleCommands[elem] = set;
	}
}


typedef QPair<int, int> PairIntInt;


LatexPackage loadCwlFile(const QString fileName, LatexCompleterConfig *config, QStringList conditions)
{
	CodeSnippetList words;
	QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
	LatexPackage package;

	QFile tagsfile("cwl:" + fileName);
    if(QFileInfo(fileName).isAbsolute() && !tagsfile.exists()){
        tagsfile.setFileName(fileName);
    }
	bool skipSection = false;
	if (tagsfile.exists() && tagsfile.open(QFile::ReadOnly)) {
		QString line;
		QTextStream stream(&tagsfile);
#if QT_VERSION < QT_VERSION_CHECK(6,0,0)
        stream.setCodec("UTF-8");
#endif
        static const QRegularExpression rxCom("^(\\\\\\w+\\*?)(\\[.+?\\])*?\\{(.*?)\\}");  // expression for \cmd[opt]{arg} (cmd may be starred, [opt] can appear arbitrary often)
        static const QRegularExpression rxCom2("^(\\\\\\w+\\*?)\\[(.+)\\]");            // expression for \cmd[opt]      (cmd may be starred)
        static const QRegularExpression rxCom3("^(\\\\\\w+\\*?)");                      // expression for \cmd           (cmd may be starred)
		QStringList keywords;
		keywords << "text" << "title" << "%<text%>" << "%<title%>";

		QString keyvals;
        package.containsOptionalSections=false;
		while (!stream.atEnd()) {
			line = stream.readLine().trimmed();
			if (line.startsWith("#endif")) {
				// end of conditional section
				skipSection = false;
				continue;
			}
			if (line.startsWith("#ifOption:")) {
                package.containsOptionalSections=true;
				QString condition = line.mid(10);
				skipSection = !(conditions.contains(condition) || conditions.contains(condition + "=true"));
				continue;
			}
			if (skipSection) // skip conditional sections (if condition is not met)
				continue;

			if (line.startsWith("#include:")) {
				//include additional cwl file
				QString fn = line.mid(9);
				if (!fn.isEmpty()) {
					if (fileName != fn + ".cwl" && !package.requiredPackages.contains(fn + ".cwl"))
						package.requiredPackages << fn + ".cwl";
				}
			}
			if (line.startsWith("#keyvals:")) {
				// start reading keyvals
				keyvals = line.mid(9);
				continue;
			}
			if (line.startsWith("#endkeyvals")) {
				// end of reading keyvals
				keyvals.clear();
				continue;
			}

			if (!keyvals.isEmpty() && !line.startsWith("#")) {
				// read keyval (name stored in "keyvals")
				QStringList l_cmds=keyvals.split(',');
				QString key;
				CommandDescription cd = extractCommandDefKeyVal(line, key);
                for(QString elem:l_cmds){
					package.possibleCommands["key%" + elem] << line;
                    if (cd.arguments.size() > 0) {
						if (key.endsWith("="))
							key.chop(1);
                        if(elem.endsWith("#c")){
                            elem.chop(2);
                        }
						package.commandDescriptions.insert(elem + "/" + key, cd);
					}
				}
				continue;
			}
			if (line.startsWith("#repl:")) {
				// start reading keyvals
				package.possibleCommands["%replace"] << line.mid(6);
				continue;
			}

			if (!line.isEmpty() && !line.startsWith("#") && !line.startsWith(" ")) {
				//hints for commands usage (e.g. in mathmode only) are separated by #
				int sep = line.indexOf('#');
				QString valid;
				QStringList env;
				QString definition;
				bool uncommon = false;
				bool hideFromCompletion = false;
				CodeSnippet::Type type = CodeSnippet::none;
				if (sep > -1) {
					valid = line.mid(sep + 1);
					line = line.left(sep);
					if (valid.startsWith("*")) {
						valid = valid.mid(1);
						uncommon = true;
					}
					// second time split for specialDef
					int sep = valid.indexOf('#');
					if (sep > -1) {
						definition = valid.mid(sep + 1);
						valid = valid.left(sep);
					}
					// normal valid
					if (valid.startsWith("/")) {
						env = valid.mid(1).split(',');
						valid = "e";
					}
					if (valid.contains("\\")) {
						int i = valid.indexOf("\\");
						QString zw = valid.mid(i + 1);
						env = zw.split(',');
						valid = valid.left(i);
					}
					if (valid.contains('S')) {
						hideFromCompletion = true;
						valid.remove('S');
					}
				}

				// parse for spell checkable commands
                QRegularExpressionMatch rxComMatch = rxCom.match(line);
                int res = rxComMatch.capturedStart();
                if (keywords.contains(rxComMatch.captured(3))) {
                    package.optionCommands << rxComMatch.captured(1);
				}
                QRegularExpressionMatch rxComMatch2 = rxCom2.match(line); // for commands which don't have a braces part e.g. \item[text]
                QRegularExpressionMatch rxComMatch3 = rxCom3.match(line); // for commands which don't have a options either e.g. \node (asas)
                int res3 = rxComMatch3.capturedStart();

				// get commandDefinition
				CommandDescription cd = extractCommandDef(line, valid);
                if(valid.startsWith("beginEnv")){
                    package.possibleCommands["%beginEnv"]<<line;
                    package.environmentAliases.insert(line, definition);
                    valid=valid.mid(8); // maintain additional classifiers
                }
                if(valid.startsWith("endEnv")){
                    package.possibleCommands["%endEnv"]<<line;
                    package.environmentAliases.insert(line, definition);
                    valid=valid.mid(6); // maintain additional classifiers
                }
				if(valid.contains('K')){
					// bracket command like \left etc
					cd.bracketCommand=true;
					valid.remove("K");
				}
                QString cmd = rxComMatch3.captured(1);
				if (cmd == "\\begin") {
					if (!package.commandDescriptions.contains(cmd)) {
						// one insertion of a general \begin-command
						CommandDescription cd;
                        cd.arguments << ArgumentDescription{ArgumentDescription::MANDATORY, Token::beginEnv};
						package.commandDescriptions.insert(cmd, cd);
					}
                    cmd = rxComMatch.captured();
				}
				if (package.commandDescriptions.contains(cmd)) {
					CommandDescription cd_old = package.commandDescriptions.value(cmd);
                    if (cd_old.arguments.size()  > cd.arguments.size() ) {
						cd = cd_old;
					}
                    if (cd_old.args() < cd.args() && cd_old.args() > 0) {
						cd = cd_old;
#ifndef QT_NO_DEBUG
						qDebug() << "inconsistent command arguments:" << cmd << fileName;
						// commands with different numbers of mandatory arguments are not distinguished by the parser and lead to unreliable results.
						// the lower numer of mandatory arguments is handled only (however not an command with zero arguments)
						// this leads to incomplete handling e.g. for hyperref (which disregards any standards and distinguishes command based on the presence of an optional argument)
#endif
					}

                    if (cd_old.args() > cd.args()) {
#ifndef QT_NO_DEBUG
                        if (cd.args() > 0) {
							qDebug() << "inconsistent command arguments:" << cmd << fileName;
							// commands with different numbers of mandatory arguments are not distinguished by the parser and lead to unreliable results.
							// the lower numer of mandatory arguments is handled only (however not an command with zero arguments)
							// this leads to incomplete handling e.g. for hyperref (which disregards any standards and distinguishes command based on the presence of an optional argument)
						}
#endif
						cd = cd_old;
					}
				}

				if(!valid.contains('M')){
					package.commandDescriptions.insert(cmd, cd);
				}else{
					// don't use line for command description
					valid.remove('M');
				}

				valid.remove('N'); // remove newtheorem declaration

                if (keywords.contains(rxComMatch2.captured(2))) {
                    package.optionCommands << rxComMatch2.captured(1);
				}
                if (valid.contains("d1")) { // definition command for newtcbox and similar. It automatically will add an extra mandatory argument for the completer
                    if (res > -1) {
                        package.possibleCommands["%definition"] << rxComMatch.captured(1);
                        package.possibleCommands["%definition1"] << rxComMatch.captured(1);
                    }
                    valid.remove("d1");
                }
				if (valid.contains('d')) { // definition command
					if (res > -1) {
                        package.possibleCommands["%definition"] << rxComMatch.captured(1);
					}
					valid.remove('d');
				}
				if (valid.contains('i')) { // include like command
					if (res > -1) {
                        package.possibleCommands["%include"] << rxComMatch.captured(1);
					}
					valid.remove('i');
				}
                if (valid.contains('I')) { // include like command
                    if (res > -1) {
                        package.possibleCommands["%import"] << rxComMatch.captured(1);
                    }
                    valid.remove('I');
                }
				if (valid.contains('l')) { // label command
					if (res > -1) {
                        package.possibleCommands["%label"] << rxComMatch.captured(1);
					}
					valid.remove('l');
				}
				if (valid.contains('r')) { // ref command
					if (res > -1) {
                        package.possibleCommands["%ref"] << rxComMatch.captured(1);

                        QRegularExpression re{"{.*?}"};
                        QRegularExpressionMatchIterator it = re.globalMatch(line);
                        QRegularExpressionMatch match;
                        for(int i=0;i<cd.arguments.size();++i){
                            if(!it.hasNext()) {
                                match=QRegularExpressionMatch();
                                break;
                            }
                            match = it.next();
                            if(cd.arguments[i].tokenType==Token::labelRef)
                                break;
                        }
                        if(match.hasMatch()){
                            line.replace(match.capturedStart(),match.capturedLength(),"{@l}");
                        }
					}
					valid.remove('r');
				}
				if (valid.contains('L')) {
					if (valid.contains("L0")) {
						valid.remove("L0");
						if (res > -1) {
							package.possibleCommands["%structure0"] << cmd;
						}
					} else if (valid.contains("L1")) {
						valid.remove("L1");
						if (res > -1) {
							package.possibleCommands["%structure1"] << cmd;
						}
					} else if (valid.contains("L2")) {
						valid.remove("L2");
						if (res > -1) {
							package.possibleCommands["%structure2"] << cmd;
						}
					} else if (valid.contains("L3")) {
						valid.remove("L3");
						if (res > -1) {
							package.possibleCommands["%structure3"] << cmd;
						}
					} else if (valid.contains("L4")) {
						valid.remove("L4");
						if (res > -1) {
							package.possibleCommands["%structure4"] << cmd;
						}
					} else if (valid.contains("L5")) {
						valid.remove("L5");
						if (res > -1) {
							package.possibleCommands["%structure5"] << cmd;
						}
					} else if (valid.contains("L6")) {
						valid.remove("L6");
						if (res > -1) {
							package.possibleCommands["%structure6"] << cmd;
						}
					} else if (valid.contains("L7")) {
						valid.remove("L7");
						if (res > -1) {
							package.possibleCommands["%structure7"] << cmd;
						}
					} else if (valid.contains("L8")) {
						valid.remove("L8");
						if (res > -1) {
							package.possibleCommands["%structure8"] << cmd;
						}
					} else if (valid.contains("L9")) {
						valid.remove("L9");
						if (res > -1) {
							package.possibleCommands["%structure9"] << cmd;
						}
					}
				}
				if (valid.contains('V')) { // verbatim command
					if (res > -1) {
                        package.possibleCommands["%verbatimEnv"] << rxComMatch.captured(3);
						env << "verbatim";
					}
					valid.remove('V');
				}
				if (valid.contains('s')) { // special def
					if (res > -1) {
                        package.specialDefCommands.insert(rxComMatch.captured(1), definition);
					} else {
						if (res3 > -1)
                            package.specialDefCommands.insert(rxComMatch3.captured(1), definition);
					}
					if (definition.startsWith('%')) {
						if (config)
							config->specialCompletionKeys.insert(definition);
					} else {
						if (definition.length() > 2) {
							QString helper = definition.mid(1, definition.length() - 2);
							if (helper.startsWith('%')) {
								if (config)
									config->specialCompletionKeys.insert(helper);
							}
						}
					}
					valid.remove('s');
				}
				if (valid.contains('c')) { // cite command
                    // replace 'c' to 'C' to maintain cwl compatibility
					valid.remove('c');
                    valid.append('C');
				}
				if (valid.contains('C')) { // cite command
					if (res > -1) {
                        QRegularExpression re{"{.*?}"};
                        QRegularExpressionMatchIterator it = re.globalMatch(line);
                        QRegularExpressionMatch match;
                        for(int i=0;i<cd.arguments.size();++i){
                            if(!it.hasNext()) {
                                match=QRegularExpressionMatch();
                                break;
                            }
                            match = it.next();
                            if(cd.arguments[i].tokenType==Token::bibItem)
                                break;
                        }
                        package.possibleCommands["%cite"] << rxComMatch.captured(1);
                        if (!line.startsWith("\\begin")) // HANDLE begin extra
                            package.possibleCommands["%citeExtendedCommand"] << rxComMatch.captured(1);
                        if(match.hasMatch()){
                            line.replace(match.capturedStart(),match.capturedLength(),"{@}");
                        }
					}
					valid.remove('C');
				}
				if (valid.contains('g')) { // definition command
					if (res > -1) {
                        package.possibleCommands["%graphics"] << rxComMatch.captured(1);
					}
					valid.remove('g');
				}
				if (valid.contains('u')) { // usepackage command
					if (res > -1) {
                        package.possibleCommands["%usepackage"] << rxComMatch.captured(1);
					}
					valid.remove('u');
				}
				if (valid.contains('b')) { // usepackage command
					if (res > -1) {
                        package.possibleCommands["%bibliography"] << rxComMatch.captured(1);
                        package.possibleCommands["%file"] << rxComMatch.captured(1);
					}
					valid.remove('b');
				}
				if (valid.contains('U')) { // url command
					if (res > -1) {
                        package.possibleCommands["%url"] << rxComMatch.captured(1);
					}
					valid.remove('U');
				}
				if (valid.contains('D')) { // todo command
					if (res > -1) {
                        package.possibleCommands["%todo"] << rxComMatch.captured(1);
					}
					valid.remove('D');
				}
				if (valid.contains('B')) { // color
					package.possibleCommands["%color"] << line;
					hideFromCompletion = true;
				}
				if (valid.contains('L')) { // a length/height
					type = CodeSnippet::length;
					valid.remove('L');
				}
				// normal commands for syntax checking
				// will be extended to distinguish between normal and math commands
				if (valid.isEmpty() || valid.contains('n')) {
					if (res > -1) {
                        if (rxComMatch.captured(1) == "\\begin" || rxComMatch.captured(1) == "\\end") {
                            package.possibleCommands["normal"] << rxComMatch.captured(1) + "{" + rxComMatch.captured(3) + "}";
						} else {
                            package.possibleCommands["normal"] << rxComMatch.captured(1);
						}
					} else {
						if (!cmd.isEmpty())
							package.possibleCommands["normal"] << cmd;
						else
							package.possibleCommands["normal"] << line.simplified();
					}
				}
				if (valid.contains('m')) { // math commands
					if (res > -1) {
                        if (rxComMatch.captured(1) == "\\begin" || rxComMatch.captured(1) == "\\end") {
                            package.possibleCommands["math"] << rxComMatch.captured(1) + "{" + rxComMatch.captured(3) + "}";
						} else {
                            package.possibleCommands["math"] << rxComMatch.captured(1);
						}
					} else {
						if (!cmd.isEmpty())
							package.possibleCommands["math"] << cmd;
						else
							package.possibleCommands["math"] << line.simplified();
					}
				}
				if (valid.contains('t')) { // tabular commands
					if (res > -1) {
                        if (rxComMatch.captured(1) == "\\begin" || rxComMatch.captured(1) == "\\end") {
                            package.possibleCommands["tabular"] << rxComMatch.captured(1) + "{" + rxComMatch.captured(3) + "}";
                            package.possibleCommands["array"] << rxComMatch.captured(1) + "{" + rxComMatch.captured(3) + "}";
						} else {
                            package.possibleCommands["tabular"] << rxComMatch.captured(1);
                            package.possibleCommands["array"] << rxComMatch.captured(1);
						}
					} else {
						if (cmd.isEmpty())
							cmd = line.simplified();
						package.possibleCommands["tabular"] << cmd;
						package.possibleCommands["array"] << cmd;
					}
				}
				if (valid.contains('T')) { // tabbing support
					if (res == -1) {
						package.possibleCommands["tabbing"] << cmd;
					}
				}
                if (valid.contains('e') && !env.isEmpty()) { // restrict to environments
					if (res == -1) {
						foreach (const QString &elem, env)
							package.possibleCommands[elem] << cmd;
					} else {
                        QString cmd = rxComMatch.captured(1);
                        QString envName = rxComMatch.captured(3);
						if (cmd == "\\begin" || cmd == "\\end") {
							cmd += "{" + envName + "}";
						}
						foreach (const QString &elem, env)
							package.possibleCommands[elem] << cmd;
					}
				}
				if (!valid.contains('e') && !env.isEmpty()) { // set env alias
					if (res > -1) {
                        if (rxComMatch.captured(1) == "\\begin") {
                            QString envName = rxComMatch.captured(3);
							if (!envName.isEmpty()) {
                                foreach (const QString &elem, env){
                                    package.environmentAliases.insert(rxComMatch.captured(3), elem);
                                    if(elem=="tabular"){
                                        LatexTables::tabularNames.insert(envName);
                                    }
                                    if(elem=="array"){
                                        LatexTables::mathTables.insert(envName);
                                    }
                                }
							}
						}
					}
				}
				// normal parsing for completer
				if (hideFromCompletion)
					continue; // command for spell checking only (auto parser)
				// remove special option classification e.g. %l
                line.remove(QRegularExpression("%[a-zA-Z]+")); // not n
				if (!line.contains("%")) {
					//add placeholders to brackets like () to (%<..%>)
					const QString brackets = "{}[]()<>";
					int lastOpen = -1, openType = -1;
					for (int i = 0; i < line.size(); i++) {
						int index = brackets.indexOf(line[i]);
						if (index >= 0) {
							if (index % 2 == 0) {
								lastOpen = i;
								openType = index / 2;
							} else {
								if (lastOpen == -1 || openType != index / 2)
									continue;
								if (i - lastOpen < 2) // ignore empty arguments, feature request 888
									continue;
                                if (line.mid(lastOpen + 1, 1) == "@" && line.mid(lastOpen + 2, 1) != "@") //ignore single @ (to be replaced with bibid in completer)
									continue;
								line.insert(lastOpen + 1, "%<");
								i += 2;
								line.insert(i, "%>");
								/*if (lastOpen+2 == i-1) {  // deactivated, feature request 888
								    line.insert(i, QApplication::translate("CodeSnippet", "something"));
								    i+=QApplication::translate("CodeSnippet", "something").length();
								}*/
								lastOpen = -1;
								i += 2;
							}
						}
					}
					if (line.startsWith("\\begin") || line.startsWith("\\end")) {
						int i = line.indexOf("%<", 0);
						line.replace(i, 2, "");
						i = line.indexOf("%>", 0);
						line.replace(i, 2, "");
						if (line.endsWith("\\item"))
							line.chop(5);

					}
				}

                CodeSnippet cs = CodeSnippet(line);
                uint hash = qHash(line);
                CodeSnippetList::iterator it = std::lower_bound(words.begin(), words.end(), cs);
                if (it == words.end() || it->index!=hash) {
                    CodeSnippetList::iterator it = std::lower_bound(words.begin(), words.end(), cs);
					it = words.insert(it, cs);
					int len = line.length();
					it->index = hash;
					it->snippetLength = len;
					it->usageCount = uncommon ? -1 : 0;
					it->type = type;
                    if(valid.contains('e') && !env.isEmpty()){
                        it->environmentRestriction = env.first(); // only use first env for now
                    }
					if (config) {
						QList<QPair<int, int> >res = config->usage.values(hash);
						foreach (const PairIntInt &elem, res) {
							if (elem.first == it->snippetLength) {
								it->usageCount = elem.second;
								break;
							}
						}
					}
				}
			}
		}
	} else {
		//qDebug() << "Completion file not found:" << fileName;
		package.packageName = "<notFound>";
		package.notFound = true;
	}

	QApplication::restoreOverrideCursor();
	package.completionWords = words;
	return package;
}


Token::TokenType tokenTypeFromCwlArg(QString arg, QString &definition)
{
	int i = arg.indexOf('%');
	// type from suffix
	if (i >= 0) {
		QString suffix = arg.mid(i);
		if (suffix == "%plain") return Token::generalArg;
		if (suffix == "%text") return Token::text;
		if (suffix == "%title") return Token::title;
		if (suffix == "%short title") return Token::shorttitle;
		if (suffix == "%todo") return Token::todo;
        if (suffix == "%file") return Token::file;
		if (suffix == "%l") return Token::width;
		if (suffix == "%cmd") return Token::def;
        if (suffix == "%definition") return Token::definition;
		if (suffix == "%formula") return Token::formula;
		if (suffix == "%keyvals") return Token::keyValArg;
		if ((suffix == "%envname") && definition.contains('N')) return Token::newTheorem;
		if (suffix == "%ref") return Token::labelRef;
		if (suffix == "%labeldef") return Token::label;
        if (suffix == "%specialDef"){
            return Token::defSpecialArg;
        }
		if (suffix == "%special") {
			Token::TokenType type = Token::specialArg;
			arg.chop(8);
			LatexParser *latexParserInstance = LatexParser::getInstancePtr();
			if (latexParserInstance) {
				if (!latexParserInstance->mapSpecialArgs.values().contains("%" + arg)) {
					int cnt = latexParserInstance->mapSpecialArgs.count();
					latexParserInstance->mapSpecialArgs.insert(cnt, "%" + arg);
					type = Token::TokenType(type + cnt);
				}
			}
			return type;
		}
	}
	// type from name
	if (arg == "text") return Token::text;
	if (arg == "title") return Token::title;
	if (arg == "short title" ) return Token::shorttitle;
	if (arg == "package") return Token::package;
	if (arg == "cols" || arg == "preamble") return Token::colDef;
	if (arg == "color") return Token::color;
	if (arg == "width" || arg == "length" || arg == "height") return Token::width;
	if (arg == "bib files" || arg == "bib file") return Token::bibfile;
	if (arg == "command" || arg == "cmd") return Token::def;
	if (arg == "def" || arg == "definition" || arg == "begdef" || arg == "enddef") return Token::definition; // actual definition: \newcommand def defArgNumber definition
	if (arg == "args") return Token::defArgNumber;
    if (arg == "xargs") return Token::defXparseArg;
	if (arg == "citekey") return Token::newBibItem;
	if (arg == "default") return Token::optionalArgDefinition;
	if (arg == "newlength") return Token::defWidth;
	if (arg == "file") return Token::file;
	if (arg == "imagefile") return Token::imagefile;
	if (arg.contains("URL")) return Token::url;
	if (arg.contains("keys") || arg == "keyvals" || arg == "%<options%>") return Token::keyValArg;
	if (arg == "options") return Token::packageoption;
	if (arg == "class") return Token::documentclass;
	if (arg == "formula") return Token::formula;
	if (arg == "beamertheme") return Token::beamertheme;
	if (arg == "keylist" || arg == "bibid") return Token::bibItem;
	if (arg == "placement" || arg == "position") return Token::placement;
	if (arg == "key"  && definition.contains('l')) return Token::label;
	if (arg == "key" || arg == "key1" || arg == "key2") return Token::labelRef;
	if ((arg == "envname" || arg == "environment name") && definition.contains('N')) return Token::newTheorem;
	if ((arg == "label" || arg == "%<label%>") && definition.contains('r')) return Token::labelRef;  // reference with keyword label
	if ((arg == "label" || arg == "%<label%>") && definition.contains('l')) return Token::label;
	if (arg == "labellist") return Token::labelRefList;
    if (arg == "verbatimSymbol") return Token::verbatimStart;
	if (arg.contains("overlay specification")) return Token::overlay;

	return Token::generalArg;
}

/*!
\brief extract command defintion from cwl line

\a line contains a command with arguments.
The argument names have special meanings which are recognized by the function and used accordingly.

argument name | description
----------|----------
\em text or ends with \em \%text| The spellchecker will operate inside this argument (by default arguments are not spellchecked).
\em title or <em> short title</em>| The spellchecker will operate inside this argument (by default arguments are not spellchecked). Furthermore the argument will be set in bold text (like in section)
\em bibid or \em keylists| If used in a command classified as "C". See the classifier description below.
\em cmd,\em command or ends with \em \%cmd| defintion for command, e.g. \\newcommand{cmd}. This "cmd" will considered to have no arguments and convey no functionality.
\em def or \em definition| actual defintion for command, e.g. \\newcommand{cmd}{definition}. This "definition" will ignored for syntax check.
\em args| number of arguments for command, e.g. \\newcommand{cmd}[args]{definition}.
\em package|package name, e.g. \\usepackage{package}
\em citekey|definition of new citation key name, e.g. \\bibitem{citekey}
\em title or <em> short title</em>|section name, e.g. \\section{title}
\em color|color name, e.g. \\textcolor{color}
\em width,\em length,\em height or ends with \em \%l|width or length option e.g. \\abc{size\%l}
\em cols or \em preamble|columns defintion in tabular,etc. , e.g. \\begin{tabular}{cols}
\em file|file name
\em URL|URL
\em options|package options, e.g. \\usepackage[options]
\em imagefile|file name of an image
\em key|label/ref key
\em label with option #r or key ending with \em \%ref|ref key
\em label with option #l or key ending with \em \%labeldef|defines a label
\em labellist|list of labels as employed by cleveref
<em>bib file</em> or <em>bib files</em>|bibliography file
\em class|document class
\em placement or \em position|position of env
\em beamertheme|beamer theme, e.g. \\usebeamertheme{beamertheme}
\em keys,\em keyvals or \em \%<options\%>|key/value list
\em envname|environment name for \\newtheorem, e.g. \\newtheorem{envname}#N (classification N needs to be present !)
\em ends with %plain|ignore a special meaning of the key
\em contains "overlay specification" | beamer overlay specification, usually within <>

 * \param line command definition until '#'
 * \param definition context information right of '#'
 * \return command definition
 */
CommandDescription extractCommandDef(QString line, QString definition)
{
    QRegularExpression rxCom("^(\\\\\\w+\\*?)");
    QRegularExpressionMatch rxComMatch = rxCom.match(line);
    QString command = rxComMatch.captured();
	line = line.mid(command.length());
	const QString specialChars = "{[(<";
	const QString specialChars2 = "}])>";
	CommandDescription cd;
	if (line.isEmpty())
		return cd;
	QChar c = line.at(0);
	int loop = 1;
	while (specialChars.contains(c)) {
		int j = specialChars.indexOf(c);
		QChar closingChar = specialChars2.at(j);
        int i = line.indexOf(closingChar);
        QString arg = line.mid(1, i - 1);
        // special case [< .. >] for default overlay specification
        if(j==1 && i>3){
            if(line.at(1)=='<' && line.at(i-1)=='>'){
                j=4;
                arg = line.mid(2, i - 2);
            }
        }

		Token::TokenType type = Token::generalArg; // assume that unknown argument is not a text
		if (loop == 1 && command == "\\begin") {
			type = Token::beginEnv;
		} else if (loop == 1 && command == "\\end") {
			type = Token::env;
		} else {
			type = tokenTypeFromCwlArg(arg, definition);
		}
		if (!arg.isEmpty()) { //ignore empty arguments
			switch (j) {
			case 0:
                cd.arguments<<ArgumentDescription{ArgumentDescription::MANDATORY, type};
				break;
			case 1:
                cd.arguments<<ArgumentDescription{ArgumentDescription::OPTIONAL, type};
				break;
			case 2:
                cd.arguments<<ArgumentDescription{ArgumentDescription::BRACKET, type};
                break;
			case 3:
                cd.arguments<<ArgumentDescription{ArgumentDescription::OVERLAY, type};
                break;
            case 4:
                cd.arguments<<ArgumentDescription{ArgumentDescription::DEFAULT_OVERLAY, type};
                break;
			default:
				break;
			}
		}
		if (i < 0)
			break;
		line = line.mid(i + 1);
		if (line.isEmpty())
			break;
		c = line.at(0);
		loop++;
	}
	return cd;
}

CommandDescription extractCommandDefKeyVal(QString line, QString &key)
{
	CommandDescription cd;
	int i = line.indexOf("#");
	if (i < 0)
		return cd;
	key = line.left(i);
    int j= key.indexOf("=");
    if(i>=0){
        // also cut possible "=" and subsequent values
        key = key.left(j);
    }
	QString vals = line.mid(i + 1);
	if (vals == "#L") {
        cd.arguments={ArgumentDescription{ArgumentDescription::MANDATORY, Token::width}};
	}
	if (vals == "#l") {
        cd.arguments={ArgumentDescription{ArgumentDescription::MANDATORY, Token::label}};
	}
    if (vals == "#d") {
        cd.arguments={ArgumentDescription{ArgumentDescription::MANDATORY, Token::definition}};
    }
	return cd;
}
