JsonFx.BuildTools.HtmlDistiller.HtmlDistiller.PrevChar C# (CSharp) Method

        private char PrevChar(int peek)
        {
            if (this.index-this.start >= peek)
            {
                // use buffered
                int pos = this.index-peek;
                if (pos < 0 || pos >= this.source.Length)
                {
                    return NullChar;
                }
                return this.source[pos];
            }

            // check the previous output if possible
            IReversePeek revPeek = this.htmlWriter as IReversePeek;
            return (revPeek == null) ? NullChar : revPeek.PrevChar(peek);
        }