package slangc.parser;

public final class SourceSnippet {
	private SourcePosition start;
	private int length;
	private String cacheValue = null;
	
	public SourceSnippet(SourcePosition start, int length) {
		reset(start, length);
	}

	public void reset(SourcePosition start, int length) {
		this.start = start;
		this.length = length;
	}
	
	public SourcePosition getStart() {
		return start;
	}
	
	public int getLength() {
		return length;
	}
	
	public String getSource() {
		if (cacheValue == null) {
			cacheValue = start.getSource().getString(start.getIndex(), length);
		}
		return cacheValue;
	}
	
	@Override
	public String toString() {
		return "SourceSnippet(" + start.toString() + ", " + length + "): \"" + getSource() + "\"";
	}
}