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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.modules.problem.TestCaseProblem;
import jcgp.backend.resources.ModifiableResources;
/**
* Contains a static method for parsing values from a
* CGP problem data file. The actual file extension
* varies from problem to problem, and is therefore
* defined in the experiment's Problem instance.
*
*
* @author Eduardo Pedroni
*
*/
public abstract class TestCaseParser {
/**
* Sets the number of inputs and outputs in the resources
* to match the given file, and parses each test case
* from the file into the specified problem.
*
* @param file the problem file to parse.
* @param problem the problem into which to parse the problem data.
* @param resources a modifiable reference to the experiment's resources
*/
public static void parse(File file, TestCaseProblem<?> problem, ModifiableResources resources) {
// create reader and scanner, print error 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;
}
resources.println("[Parser] Parsing file: " + file.getAbsolutePath() + "...");
Scanner in = new Scanner(fr);
boolean readingTestCases = false;
int inputs = 0, outputs = 0;
int cases = 0;
// this overwrites any previously added test cases
problem.clearTestCases();
while (in.hasNextLine()) {
String nextLine = in.nextLine();
// set resources input count to parsed value
if (nextLine.startsWith(".i")) {
String[] split = nextLine.split(" +");
inputs = Integer.parseInt(split[1]);
resources.setInputs(inputs);
resources.println("[Parser] Number of inputs set to " + resources.inputs());
}
// set resources output count to parsed value
else if (nextLine.startsWith(".o")) {
String[] split = nextLine.split(" +");
outputs = Integer.parseInt(split[1]);
resources.setOutputs(outputs);
resources.println("[Parser] Number of outputs set to " + resources.outputs());
} else if (nextLine.startsWith(".p") || nextLine.startsWith(".t")) {
readingTestCases = true;
} else if (nextLine.startsWith(".e")) {
readingTestCases = false;
/*
* Split every line at one or more spaces or tabs, and
* parse the two sides into inputs and outputs.
*/
} else if (readingTestCases) {
String[] split = nextLine.split("( |\t)+");
String[] inputCases = new String[inputs];
String[] outputCases = new String[outputs];
for (int i = 0; i < inputs; i++) {
inputCases[i] = split[i];
}
for (int o = 0; o < outputs; o++) {
outputCases[o] = split[o + inputs];
}
problem.addTestCase(inputCases, outputCases);
cases++;
}
}
resources.println("[Parser] Finished, added " + cases + " test cases");
in.close();
}
}
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