parser.cpp
author insilmaril
Wed, 04 Jul 2007 11:05:11 +0000
changeset 536 322402d9f9f9
parent 534 32b71ba642aa
child 538 be2299221801
permissions -rw-r--r--
Version 1.9.0
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#include "parser.h"
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#include <QRegExp>
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#include <iostream>
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using namespace std;
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Parser::Parser()
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{
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	initParser();
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}
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void Parser::initParser()
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{
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	initAtom();
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	current=-1;
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}
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void Parser::initAtom()
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{
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	atom="";
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	com="";
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	paramList.clear();
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	resetError();
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}
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void Parser::parseAtom (QString s)
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{
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	initAtom();
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	atom=s;
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	QRegExp re;
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	int pos;
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	// Strip WS at beginning
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	re.setPattern ("\\w");
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	re.setMinimal (true);
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	pos=re.search (atom);
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	if (pos>=0)
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		s=s.right(s.length()-pos);
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	// Get command
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	re.setPattern ("\\b(.*)(\\s|\\()");
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	pos=re.search (s);
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	if (pos>=0)
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		com=re.cap(1);
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	// Get parameters
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	paramList.clear();
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	re.setPattern ("\\((.*)\\)");
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	pos=re.search (s);
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	//cout << "  s="<<s.ascii()<<endl;
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	//cout << "com="<<com.ascii()<<"  pos="<<pos<<endl<<endl;
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	if (pos>=0)
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	{
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		QString s=re.cap(1);
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		QString a;
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		bool inquote=false;
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		pos=0;
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		if (!s.isEmpty())
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		{
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			while (pos<s.length())
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			{
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				if (s.at(pos)=='\"') 
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				{
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					if (inquote)
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						inquote=false;
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					else	
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						inquote=true;
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				}
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				if (s.at(pos)==',' && !inquote)
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				{
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					a=s.left(pos);
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					paramList.append(a);
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					s=s.right(s.length()-pos-1);
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					pos=0;
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				} else
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					pos++;
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			}
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			paramList.append (s);
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		}	
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	}	
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}
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QString Parser::getAtom()
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{
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	return atom;
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}
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QString Parser::getCommand()
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{
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	return com;
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}
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QStringList Parser::getParameters()
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{
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	return paramList;
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}
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int Parser::parCount()
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{
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	return paramList.count();
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}
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QString Parser::errorMessage()
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{
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	QString l;
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	switch (errLevel)
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	{
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		case NoError: l="No Error";
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		case Warning: l="Warning";
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		case Aborted: l="Aborted";
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	}
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	return QString ("Error Level: %1\n    Command: %2\nDescription: %3")
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		.arg(l).arg(com).arg(errDescription);
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}
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QString Parser::errorDescription()
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{
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	return errDescription;
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}
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ErrorLevel Parser::errorLevel()
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{
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	return errLevel;
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}
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void Parser::setError(ErrorLevel level, const QString &description)
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{
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	errDescription=description;
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	errLevel=level;
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}
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void Parser::resetError ()
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{
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	errMessage="";
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	errDescription="";
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	errLevel=NoError;
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}
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bool Parser::checkParCount (QList <int> plist)
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{
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	QStringList expList;
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	QString expected;
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	for (int i=0; i<plist.count();i++)
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	{
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		if (checkParCount (plist[i])) 
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		{
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			resetError();
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			return true;
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		}
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		expList.append(QString().setNum(plist[i]));
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	}	
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	expected=expList.join(",");	
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	errDescription=QString("Wrong number of parameters: Expected %1, but found %2").arg(expected).arg(paramList.count());
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	return false;
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}
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bool Parser::checkParCount (const int &expected)
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{
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	if (paramList.count()!=expected)
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	{
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		errLevel=Aborted;
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		errDescription=QString("Wrong number of parameters: Expected %1, but found %2").arg(expected).arg(paramList.count());
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		return false;
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	} 
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	return true;	
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}
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bool Parser::checkParIsInt(const int &index)
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{
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	bool ok;
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	if (index > paramList.count())
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	{
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		errLevel=Aborted;
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		errDescription=QString("Parameter index %1 is outside of parameter list").arg(index);
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		return false;
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	} else
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	{
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		paramList[index].toInt (&ok, 10);
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		if (!ok)
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		{
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			errLevel=Aborted;
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			errDescription=QString("Parameter %1 is not an integer").arg(index);
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			return false;
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		} 
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	}	
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	return true;
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}
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int Parser::parInt (bool &ok,const uint &index)
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{
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	if (checkParIsInt (index))
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		return paramList[index].toInt (&ok, 10);
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	ok=false;
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	return 0;
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}
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QString Parser::parString (bool &ok,const int &index)
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{
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	// return the string at index, this could be also stored in
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	// a variable later
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	QString r;
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	QRegExp re("\"(.*)\"");
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	int pos=re.search (paramList[index]);
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	if (pos>=0)
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		r=re.cap (1);
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	else	
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		r="";
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	ok=true;
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	return r;
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}
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bool Parser::parBool (bool &ok,const int &index)
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{
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	// return the bool at index, this could be also stored in
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	// a variable later
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	QString r;
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	ok=true;
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	QString p=paramList[index];
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	if (p=="true" || p=="1")
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		return true;
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	else if	(p=="false" || p=="0")
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		return false;
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	ok=false;
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	return ok;
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}
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QColor Parser::parColor(bool &ok,const int &index)
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{
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	// return the QColor at index
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	ok=false;
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	QString r;
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	QColor c;
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	QRegExp re("\"(.*)\"");
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	int pos=re.search (paramList[index]);
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	if (pos>=0)
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	{
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		r=re.cap (1);
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		c.setNamedColor(r);
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		ok=c.isValid();
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	}	
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	return c;
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}
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void Parser::setScript(const QString &s)
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{
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	script=s;
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}	
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QString Parser::getScript()
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{
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	return script;
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}	
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void Parser::runScript()
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{
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	current=0;
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}	
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bool Parser::next()
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{
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	int start=current;
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	if (current<0) runScript();
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	if (current>=script.length()-1) return false;
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	bool inBracket=false;
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	while (true)
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	{
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		//cout <<"current="<<current<< "   start="<<start<<"  length="<<script.length()<<endl;
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		// Check if we are inside a string
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		if (script.at(current)=='"')
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		{
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			if (inBracket)
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				inBracket=false;
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			else	
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				inBracket=true;
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		}
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		// Check if we are in a comment
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		if (!inBracket && script.at(current)=='#')
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		{
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			while (script.at(current)!='\n')
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			{
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				current++;
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				if (current>=script.length()) 
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					return false;
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			}
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			start=current;
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		}
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		// Check for end of atom
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		if (!inBracket && script.at(current)==';')
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		{
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			atom=script.mid(start,current-start);
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			current++;
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			return true;
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		}
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		// Check for end of script
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		if (current==script.length() )
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		{
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			if (inBracket)
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			{
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				setError (Aborted,"Runaway string");
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				return false;
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			} else
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			{
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				atom=script.mid(start);
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				return true;
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			}
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		}
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		current++;
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	}
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}	
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