/***************************************************************************
 *   Copyright (C) 2005 by David Saxton                                    *
 *   david@bluehaze.org                                                    *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 ***************************************************************************/

#include "asmparser.h"
#include "config.h"
#include "gpsimprocessor.h"

#include <kdebug.h>
#include <qfile.h>
#include <qregexp.h>

AsmParser::AsmParser( const QString &url )
	: m_url(url)
{
	m_bContainsRadix = false;
	m_type = Absolute;
}


AsmParser::~AsmParser()
{
}


bool AsmParser::parse( GpsimDebugger * debugger )
{
	QFile file(m_url);
	if ( !file.open(IO_ReadOnly) )
		return false;
	
	QTextStream stream( &file );
	
	m_type = Absolute;
	m_bContainsRadix = false;
	m_picID = QString::null;
	
	QStringList nonAbsoluteOps = QStringList::split( ",",
			"code,.def,.dim,.direct,endw,extern,.file,global,idata,.ident,.line,.type,udata,udata_acs,udata_ovr,udata_shr" );
	
	unsigned inputAtLine = 0;
	while ( !stream.atEnd() )
	{
		const QString line = stream.readLine().stripWhiteSpace();
		if ( m_type != Relocatable )
		{
			QString col0 = line.section( QRegExp("[; ]"), 0, 0 );
			col0 = col0.stripWhiteSpace();
			if ( nonAbsoluteOps.contains(col0) )
				m_type = Relocatable;
		}
		if ( !m_bContainsRadix )
		{
			if ( line.contains( QRegExp("^RADIX[\\s]*") ) || line.contains( QRegExp("^radix[\\s]*") ) )
				m_bContainsRadix = true;
		}
		if ( m_picID.isEmpty() )
		{
			// We look for "list p = ", and "list p = picid ", and subtract the positions / lengths away from each other to get the picid text position
			QRegExp fullRegExp("[lL][iI][sS][tT][\\s]+[pP][\\s]*=[\\s]*[\\d\\w]+");
			QRegExp halfRegExp("[lL][iI][sS][tT][\\s]+[pP][\\s]*=[\\s]*");
			
			int startPos = fullRegExp.search(line);
			if ( (startPos != -1) && (startPos == halfRegExp.search(line)) )
			{
				m_picID = line.mid( startPos + halfRegExp.matchedLength(), fullRegExp.matchedLength() - halfRegExp.matchedLength() );
				m_picID = m_picID.upper();
				if ( !m_picID.startsWith("P") )
					m_picID.prepend("P");
			}
		}
#ifndef NO_GPSIM
		if ( debugger && line.startsWith(";#CSRC\t") )
		{
			// Assembly file produced (by sdcc) from C, line is in format:
			// ;#CSRC\t[file-name] [file-line]
			// The filename can contain spaces.
			int fileLineAt = line.findRev(" ");
			
			if ( fileLineAt == -1 )
				kdWarning() << k_funcinfo << "Syntax error in line \"" << line << "\" while looking for file-line" << endl;
			else
			{
				// 7 = length_of(";#CSRC\t")
				QString fileName = line.mid( 7, fileLineAt-7 );
				QString fileLineString = line.mid( fileLineAt+1, line.length() - fileLineAt - 1 );
					
				if ( fileName.startsWith("\"") )
				{
					// Newer versions of SDCC insert " around the filename
					fileName.remove( 0, 1 ); // First "
					fileName.remove( fileName.length()-1, 1 ); // Last "
				}
				
				bool ok;
				int fileLine = fileLineString.toInt(&ok) - 1;
				if ( ok && fileLine >= 0 )
					debugger->associateLine( fileName, fileLine, m_url, inputAtLine );
				else
					kdDebug() << k_funcinfo << "Not a valid line number: \"" << fileLineString << "\"" << endl;
			}
		}
		if ( debugger && (line.startsWith(".line\t") || line.startsWith(";#MSRC") ) )
		{
			// Assembly file produced by either sdcc or microbe, line is in format:
			// \t[".line"/"#MSRC"]\t[file-line]; [file-name]\t[c/microbe source code for that line]
			// We're screwed if the file name contains tabs, but hopefully not many do...
			QStringList lineParts = QStringList::split( '\t', line );
			if ( lineParts.size() < 2 )
				kdWarning() << k_funcinfo << "Line is in wrong format for extracing source line and file: \""<<line<<"\""<<endl;
			else
			{
				const QString lineAndFile = lineParts[1];
				int lineFileSplit = lineAndFile.find("; ");
				if ( lineFileSplit == -1 )
					kdDebug() << k_funcinfo << "Could not find file / line split in \""<<lineAndFile<<"\""<<endl;
				else
				{
					QString fileName = lineAndFile.mid( lineFileSplit + 2 );
					QString fileLineString = lineAndFile.left( lineFileSplit );
					
					if ( fileName.startsWith("\"") )
					{
						// Newer versions of SDCC insert " around the filename
						fileName.remove( 0, 1 ); // First "
						fileName.remove( fileName.length()-1, 1 ); // Last "
					}
				
					bool ok;
					int fileLine = fileLineString.toInt(&ok) - 1;
					if ( ok && fileLine >= 0 )
						debugger->associateLine( fileName, fileLine, m_url, inputAtLine );
					else
						kdDebug() << k_funcinfo << "Not a valid line number: \"" << fileLineString << "\"" << endl;
				}
			}
		}
#endif // !NO_GPSIM
		inputAtLine++;
	}
	
	return true;
}