net.amygdalum.util.text.CharRange Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of compilerutils Show documentation

Utility classes needed for search and compiler applications

The newest version!

package net.amygdalum.util.text;

import static java.util.Arrays.asList;
import static net.amygdalum.util.text.CharUtils.after;
import static net.amygdalum.util.text.CharUtils.before;

import java.util.List;

public class CharRange {

	public char from;
	public char to;

	public CharRange(char from, char to) {
		this.from = from;
		this.to = to;
	}

	public boolean contains(char value) {
		return value >= from
			&& value <= to;
	}

	public List splitBefore(char value) {
		if (value == from) {
			return asList(this);
		} else {
			return asList(
				new CharRange(from, before(value)),
				new CharRange(value, to));
		}
	}

	public List splitAfter(char value) {
		if (value == to) {
			return asList(this);
		} else {
			return asList(
				new CharRange(from, value),
				new CharRange(after(value), to));
		}
	}

	public List splitAround(char from, char to) {
		boolean fromStart = this.from == from;
		boolean toEnd = this.to == to;
		if (fromStart && toEnd) {
			return asList(this);
		} else if (fromStart) {
			return asList(
				new CharRange(from, to),
				new CharRange(after(to), this.to));
		} else if (toEnd) {
			return asList(
				new CharRange(this.from, before(from)),
				new CharRange(from, to));
		} else {
			return asList(
				new CharRange(this.from, before(from)),
				new CharRange(from, to),
				new CharRange(after(to), this.to));
		}
	}

	@Override
	public int hashCode() {
		return (int) from * 7
			+ (int) to * 3;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj) {
			return true;
		}
		if (obj == null) {
			return false;
		}
		if (getClass() != obj.getClass()) {
			return false;
		}
		CharRange that = (CharRange) obj;
		return this.from == that.from
			&& this.to == that.to;
	}

	@Override
	public String toString() {
		return from + "-" + to;
	}

}