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package jcgp.backend.parsers;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Scanner;
import jcgp.backend.resources.ModifiableResources;
/**
* Contains a static method for parsing parameters from a
* .par file.
*
* @author Eduardo Pedroni
*
*/
public abstract class ParameterParser {
/**
* Parses the parameters from a specified CGP parameter file and
* modifies the experiment resources appropriately.
* <br><br>
* CGP .par files do not follow a very strict convention, so this
* parser does its best to cope with format irregularities. Parsing
* works even if the parameters are in the wrong order, and unknown
* parameters are simply ignored.
*
* @param file the .par file to parse.
* @param resources a reference to the resources object that must be modified.
*/
public static void parse(File file, ModifiableResources resources) {
// create reader and scanner, print message if file is missing
FileReader fr;
try {
fr = new FileReader(file);
} catch (FileNotFoundException e) {
resources.println("[Parser] Error: could not find " + file.getAbsolutePath());
return;
}
Scanner in = new Scanner(fr);
resources.println("[Parser] Parsing file: " + file.getAbsolutePath() + "...");
// parse line by line
while (in.hasNextLine()) {
// split if one or more tabs or one or more spaces are found
String[] splitString = in.nextLine().split("( |\t)+");
// expected length is 2, anything beyond that should also work
if (splitString.length >= 2) {
switch (splitString[1]) {
case "population_size":
resources.setPopulationSize(Integer.parseInt(splitString[0]));
resources.println("[Parser] Population size is now " + resources.populationSize());
break;
case "num_generations":
resources.setGenerations(Integer.parseInt(splitString[0]));
resources.println("[Parser] Total generations is now " + resources.generations());
break;
case "num_runs_total":
resources.setRuns(Integer.parseInt(splitString[0]));
resources.println("[Parser] Total runs is now " + resources.runs());
break;
case "num_rows":
resources.setRows(Integer.parseInt(splitString[0]));
resources.println("[Parser] Row number is now " + resources.rows());
break;
case "num_cols":
resources.setColumns(Integer.parseInt(splitString[0]));
resources.println("[Parser] Column number is now " + resources.columns());
break;
case "levels_back":
resources.setLevelsBack(Integer.parseInt(splitString[0]));
resources.println("[Parser] Levels back is now " + resources.levelsBack());
break;
case "report_interval":
resources.setReportInterval(Integer.parseInt(splitString[0]));
resources.println("[Parser] Report interval is now " + resources.levelsBack());
break;
case "global_seed":
resources.setSeed(Integer.parseInt(splitString[0]));
resources.println("[Parser] Seed is now " + resources.seed());
break;
default:
break;
}
}
}
in.close();
resources.println("[Parser] Finished parsing parameters");
}
}
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