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/*
 * Original Guava code is copyright (C) 2015 The Guava Authors.
 * Modifications from Guava are copyright (C) 2015 DiffPlug.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.common.primitives;

import javax.annotation.CheckReturnValue;

import com.google.common.annotations.GwtCompatible;

/**
 * A string to be parsed as a number and the radix to interpret it in.
 */
@CheckReturnValue
@GwtCompatible
final class ParseRequest {
	final String rawValue;
	final int radix;

	private ParseRequest(String rawValue, int radix) {
		this.rawValue = rawValue;
		this.radix = radix;
	}

	static ParseRequest fromString(String stringValue) {
		if (stringValue.length() == 0) {
			throw new NumberFormatException("empty string");
		}

		// Handle radix specifier if present
		String rawValue;
		int radix;
		char firstChar = stringValue.charAt(0);
		if (stringValue.startsWith("0x") || stringValue.startsWith("0X")) {
			rawValue = stringValue.substring(2);
			radix = 16;
		} else if (firstChar == '#') {
			rawValue = stringValue.substring(1);
			radix = 16;
		} else if (firstChar == '0' && stringValue.length() > 1) {
			rawValue = stringValue.substring(1);
			radix = 8;
		} else {
			rawValue = stringValue;
			radix = 10;
		}

		return new ParseRequest(rawValue, radix);
	}
}