package net.minecraft.util.parsing.packrat.commands;

import com.mojang.brigadier.StringReader;
import com.mojang.brigadier.exceptions.CommandSyntaxException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import net.minecraft.util.parsing.packrat.DelayedException;
import net.minecraft.util.parsing.packrat.ParseState;
import net.minecraft.util.parsing.packrat.Rule;

public final class GreedyPatternParseRule implements Rule<StringReader, String> {
	private final Pattern pattern;
	private final DelayedException<CommandSyntaxException> error;

	public GreedyPatternParseRule(final Pattern pattern, final DelayedException<CommandSyntaxException> error) {
		this.pattern = pattern;
		this.error = error;
	}

	public String parse(final ParseState<StringReader> state) {
		StringReader input = state.input();
		String fullString = input.getString();
		Matcher matcher = this.pattern.matcher(fullString).region(input.getCursor(), fullString.length());
		if (!matcher.lookingAt()) {
			state.errorCollector().store(state.mark(), this.error);
			return null;
		} else {
			input.setCursor(matcher.end());
			return matcher.group(0);
		}
	}
}