com.github.bloodshura.sparkium.brainfxck.util.BrainfuckCodeGenerator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of sparkium-brainfxck Show documentation

A highly extensible, simple interpreter for the Brainfuck language.

The newest version!

package com.github.bloodshura.sparkium.brainfxck.util;

import com.github.bloodshura.ignitium.charset.TextBuilder;
import com.github.bloodshura.ignitium.worker.StringWorker;

import javax.annotation.Nonnull;

/**
 * This utility class is responsible for generating common Brainfuck code.
 */
public class BrainfuckCodeGenerator {
	/**
	 * Generates a Brainfuck code which outputs the specified parameter.
	 *  The generated code will be commented.
	 *
	 * @param output The output
	 * @return A String containing the generated Brainfuck code
	 * @see #forPrinting(String, int, boolean, int)
	 */
	@Nonnull
	public static String forPrinting(@Nonnull String output) {
		return forPrinting(output, 10, true, 45);
	}

	/**
	 * Generates a Brainfuck code which outputs the specified first parameter.
	 *
	 * @param output The output
	 * @param factor A factor used to control the behaviour of code generation
	 * @param commented If the generated code must be commented or not
	 * @param commentOffset At what offset the comments will be present
	 * @return A String containing the generated Brainfuck code
	 */
	@Nonnull
	public static String forPrinting(@Nonnull String output, int factor, boolean commented, int commentOffset) {
		TextBuilder builder = new TextBuilder();
		int count;
		int repeatAmount;
		int rest;

		for (char ch : output.toCharArray()) {
			repeatAmount = ch / factor;
			rest = ch % factor;
			count = 3 + repeatAmount + 2 + factor + 4 + rest;

			builder.append('>');
			builder.append(' ');
			builder.append('>');
			builder.appendMany('+', repeatAmount);
			builder.append('[');
			builder.append('<');
			builder.appendMany('+', factor);
			builder.append('>');
			builder.append('-');
			builder.append(']');
			builder.append('<');
			builder.appendMany('+', rest);

			if (commented) {
				builder.appendMany(' ', commentOffset - count);
				builder.append('\'');
				builder.append(' ');
				builder.append(StringWorker.escape(String.valueOf(ch)));
			}

			builder.newLine();
		}

		builder.appendMany('<', output.length() - 1);
		builder.newLine();
		builder.append('[');
		builder.append('.');
		builder.append('>');
		builder.append(']');

		return builder.toString();
	}
}