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FileParser.java
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FileParser.java
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import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.regex.Matcher;
//import java.util.List;
import java.util.regex.Pattern;
// FileParser takes in the machine code file and produces:
// - 2 ArrayList for instructions and data
// - 3 memory addresses for start, instr, and data
public class FileParser {
private File asm_file;
private ArrayList<String> fileContent, instrContent, dataContent;
private String startAddr, instrAddr, dataAddr;
// --------------------------------------------------------------- Properties
public void setFile(File file)
{
asm_file = file;
}
public File getFile()
{
return asm_file;
}
public String getFileName()
{
return asm_file.getName();
}
public ArrayList<String> getFileContent()
{
return fileContent;
}
public ArrayList<String> getInstrContent()
{
return instrContent;
}
public ArrayList<String> getDataContent()
{
return dataContent;
}
public String getStartAddr()
{
return startAddr;
}
public String getInstrAddr()
{
return instrAddr;
}
public String getDataAddr()
{
return dataAddr;
}
// ----------------------------------------------------------- Constructor
public FileParser(File file) throws DebugException
{
fileContent = new ArrayList<String>(); // initialize ArrayList
instrContent = new ArrayList<String>();
dataContent = new ArrayList<String>();
this.setFile(file);
linesToArrayList(); // convert each line in the file to a String and store in a list
try
{
linesToInstrData();
}
catch (DebugException ex)
{
println(ex);
ex.printStackTrace();
throw new DebugException("DebugException thrown from FileParser->FileParser(File file)");
}
}
// ----------------------------------------------------------- Local Methods
// This method stores all lines into an Arraylist fileContent
private void linesToArrayList()
{
Scanner s;
try
{
File file = getFile();
s = new Scanner(file);
while (s.hasNextLine())
{
String nextLine = s.nextLine();
nextLine = nextLine.split("#")[0]; // remove comments
nextLine = nextLine.trim(); // remove leading and trailing whitespaces
if (!(nextLine.length() == 0))
{
fileContent.add(nextLine);
}
}
s.close();
}
catch (FileNotFoundException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// This method identifies and stores instrs and data to their appropriate ArrayList
// It also identifies starting address, instruction address, and data address in memory.
private void linesToInstrData() throws DebugException
{
// for validating lines in instrContent, dataContent
long numInstr = 0, dataLength = 0;
// This decides next String in the array belongs to which ArrayList
int currentState = -1; // start = 0, instr = 1, data = 2
for (String line : fileContent)
{
// make all lower case
line = line.toLowerCase();
// remove the "," after the instructions
if (line.endsWith(","))
line = line.substring(0, line.length()-1);
if (line.startsWith("start"))
{
String addr = line.substring(6, 14);
if (!addr.matches("^[0-9A-F]+$")) // address should be in hex format
{
throw new DebugException("Error - Parsed start address format is incorrect!");
}
startAddr = addr;
currentState = 0;
}
if (line.startsWith("data"))
{
// GET THE ADDRESS
String addr = line.substring(5, 13);
if (!addr.matches("^[0-9A-F]+$")) // address should be in hex format
{
throw new DebugException("Error - Parsed data address format is incorrect!");
}
dataAddr = addr;
// GET THE DATA LENGTH
Pattern pattern = Pattern.compile("(\\d+)(?!.*\\d)");
Matcher matcher = pattern.matcher(line);
if (matcher.find())
dataLength = Long.parseLong(matcher.group(0));
currentState = 2;
//println(dataLength);
}
if (line.startsWith("instr"))
{
// GET THE ADDRESS
String addr = line.substring(6, 14);
if (!addr.matches("^[0-9A-F]+$")) // address should be in hex format
{
throw new DebugException("Error - Parsed instr address format is incorrect!");
}
instrAddr = addr;
// GET THE DATA LENGTH
Pattern pattern = Pattern.compile("(\\d+)(?!.*\\d)");
Matcher matcher = pattern.matcher(line);
if (matcher.find())
numInstr = Long.parseLong(matcher.group(0));
currentState = 1;
}
if(!line.startsWith("instr") && !line.startsWith("data") && !line.startsWith("start"))
{
if (currentState == 1)
{
if (line.length() != 8 && !line.matches("[0-9a-fA-F]+"))
{
throw new DebugException("Error - instruction format is not correct!");
}
else
{
instrContent.add(line);
}
}
else if (currentState == 2)
{
String[] data_lines = line.split(",");
for(String data_line : data_lines)
{
if (data_line.length() != 2 && !data_line.matches("[0-9a-fA-F]+"))
{
throw new DebugException("Error - data format is not correct!");
}
else
{
dataContent.add(data_line);
}
}
}
}
}
// Validate the number of lines
if (numInstr != instrContent.size())
{
throw new DebugException("Error - number of instructions does not match description!");
}
if (dataLength != dataContent.size())
{
throw new DebugException("Error - data length does not match description!");
}
}
// ------------------------------------------------------------ Supporting Methods
public void PrintContent()
{
println("start addr = " + startAddr);
println("instr addr = " + instrAddr);
println("data addr = " + dataAddr);
println("\nFile Content: ");
for (String line : fileContent)
{
println(line);
}
println("\nInstruction Content: ");
for (String line : instrContent)
{
println(line);
}
println("\nData Content: ");
for (String line : dataContent)
{
println(line);
}
}
public static void println(Object line)
{
System.out.println(line);
}
}