com.github.bloodshura.sparkium.brainfxck.action.impl.XAction Maven / Gradle / Ivy

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A highly extensible, simple interpreter for the Brainfuck language.

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package com.github.bloodshura.sparkium.brainfxck.action.impl;

import com.github.bloodshura.ignitium.charset.sequence.CharSet;
import com.github.bloodshura.ignitium.collection.map.XMap;
import com.github.bloodshura.sparkium.brainfxck.BrainfuckContext;
import com.github.bloodshura.sparkium.brainfxck.BrainfuckInterpreter;
import com.github.bloodshura.sparkium.brainfxck.BrainfuckMemory;
import com.github.bloodshura.sparkium.brainfxck.action.Action;

import javax.annotation.Nonnull;
import java.io.IOException;

/**
 * This class represents a custom action, which can be used on a {@link BrainfuckInterpreter}.
 *  This class is always changing, so only use it for test purposes.
 */
public class XAction implements Action {
	/**
	 * A {@link CharSet} instance containing all the characters which are manipulated by this action.
	 */
	public static final CharSet CHAR_SET = new CharSet('$', ';', '\\');

	/**
	 * The flag name used for storing the escaping state of reprocessings.
	 *
	 * @see BrainfuckContext#getFlags()
	 */
	public static final String FLAG_ESCAPE = "lastEscaped";

	/**
	 * The flag name used for storing reprocessings.
	 *
	 * @see BrainfuckContext#getFlags()
	 */
	public static final String FLAG_REPROCESS = "reprocess";

	@Override
	public boolean act(char ch, @Nonnull BrainfuckContext context) throws IOException {
		BrainfuckInterpreter interpreter = context.getInterpreter();
		BrainfuckMemory memory = interpreter.getMemory();
		XMap flags = context.getFlags();
		int skipLevel = (int) flags.get(DefaultAction.FLAG_SKIP, 0);

		if (skipLevel > 0) {
			return false;
		}

		boolean lastEscape = flags.containsKey(FLAG_ESCAPE);
		int reprocessCount = (int) flags.get(FLAG_REPROCESS, 0);

		if (ch == '\\') {
			flags.set(FLAG_ESCAPE, true);
		} else if (lastEscape) {
			flags.removeKey(FLAG_ESCAPE);

			if (ch >= '0' && ch <= '9') {
				flags.set(FLAG_REPROCESS, reprocessCount + Character.getNumericValue(ch));
			}
		} else if (reprocessCount > 0) {
			flags.set(FLAG_REPROCESS, 0);

			for (int i = 0; i < reprocessCount; i++) {
				context.interpret(ch);
			}
		} else if (ch == '$') {
			interpreter.getLogger().print(memory.getPointer());
		} else if (ch == ';') {
			interpreter.getLogger().print(memory.getValue());
		} else {
			return false;
		}

		return true;
	}
}