Cut.java

package org.softlang.company.features;

import static org.softlang.company.features.recognizer.Token.*;
import org.softlang.company.features.recognizer.Token;
import org.softlang.company.features.recognizer.Recognizer;

import java.io.Writer;
import java.io.OutputStreamWriter;
import java.io.FileOutputStream;
import java.io.IOException;

public class Cut {

    private Recognizer recognizer;
    private Writer writer;
    int indent = 0;

    // Local write that swallows checked exception, too
    private void write(String s) {
        try {
            writer.write(s);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }        
    }

    // Convenient macros for pretty printing
    private void space() { write(" "); }
    private void nl() { write("\n"); }
    private void right() { indent += 3; }
    private void left() { indent -= 3; }
    private void indent() { for(int i=0; i<indent; i++) space(); }

    public void cut(String in, String out) throws IOException {
        recognizer = new Recognizer(in);
        writer = new OutputStreamWriter(new FileOutputStream(out));
        Token current = null;
        Token previous = null;
        String lexeme = null;
        while (recognizer.hasNext()) {
            current = recognizer.next();
            lexeme = recognizer.getLexeme();

            // Cut salary in half
            if (current==FLOAT && previous==SALARY)
                lexeme = Double.toString(
                            (Double.parseDouble(recognizer.getLexeme())
                                / 2.0d));

            // Adjust indentation
            if (current==OPEN) right();
            if (current==CLOSE) left();

            // Add linebreaks
            if (current==DEPARTMENT
            ||  current==MANAGER
            ||  current==EMPLOYEE
            ||  current==ADDRESS
            ||  current==SALARY
            ||  current==CLOSE) {
                nl();
                indent();
            }

            // Copy possibly modified lexeme
            write(lexeme + " ");

            previous = current;
        }
        writer.close();
    }

}