StringUtils.cs

using System;
using System.Collections.Generic;

namespace luunate
{
	public static class StringUtils
	{
		public static string Join(this IEnumerable<string> values, string separator = " ") {
			return string.Join (separator.IfNull(" "), values);
		}

		public static string Form(this string format, params object[] args) {
			return string.Format(format.IfNull(""), args);
		}

		public static string IfNull(this string val, string defaultStr) {
			if (val == null) {
				return defaultStr;
			}
			return val;
		}

		public static string IfNullOrEmpty(this string val, string defaultStr) {
			if (val.IfNull("").Length == 0) {
				return defaultStr;
			}
			return val;
		}

		public static float ToFloat(this string val) {
			float result;
			result = float.Parse(val.IfNull(""));
			return result;
		}

		public static float ToFloat(this string val, float defaultStr) {
			float result;
			if (!float.TryParse(val.IfNullOrEmpty(""), out result)) {
				result = defaultStr;
			}
			return result;
		}

		public static int? ToInt(this string val) {
			int result;
			if (!int.TryParse (val.IfNull (""), out result)) {
				return null;
			}
			return result;
		}

		public static int ToInt(this string val, int defaultStr) {
			int result;
			if (!int.TryParse(val.IfNullOrEmpty(""), out result)) {
				result = defaultStr;
			}
			return result;
		}
	}
}