3rdpartylibs/fastreports.wpf/FastReport/Print/PageNumbersParser.cs

using System;
using System.Collections;
using System.Collections.Generic;

namespace FastReport.Print
{
    internal class PageNumbersParser
    {
        private List<int> pages;

        public int Count
        {
            get { return pages.Count; }
        }

        private bool Parse(string pageNumbers, int total)
        {
            pages.Clear();
            string s = pageNumbers.Replace(" ", "");
            if (s == "") return false;

            if (s[s.Length - 1] == '-')
                s += total.ToString();
            s += ',';

            int i = 0;
            int j = 0;
            int n1 = 0;
            int n2 = 0;
            bool isRange = false;

            while (i < s.Length)
            {
                if (s[i] == ',')
                {
                    n2 = int.Parse(s.Substring(j, i - j));
                    j = i + 1;
                    if (isRange)
                    {
                        while (n1 <= n2)
                        {
                            pages.Add(n1 - 1);
                            n1++;
                        }
                    }
                    else
                        pages.Add(n2 - 1);
                    isRange = false;
                }
                else if (s[i] == '-')
                {
                    isRange = true;
                    n1 = int.Parse(s.Substring(j, i - j));
                    j = i + 1;
                }
                i++;
            }

            return true;
        }

        public bool GetPage(ref int pageNo)
        {
            if (pages.Count == 0)
                return false;
            pageNo = pages[0];
            pages.RemoveAt(0);
            return true;
        }

        public PageNumbersParser(Report report, int curPage)
        {
            pages = new List<int>();

            int total = report.PreparedPages.Count;
            if (report.PrintSettings.PageRange == PageRange.Current)
                pages.Add(curPage - 1);
            else if (!Parse(report.PrintSettings.PageNumbers, total))
            {
                for (int i = 0; i < total; i++)
                    pages.Add(i);
            }

            // remove bad page numbers
            for (int i = 0; i < pages.Count; i++)
            {
                if (pages[i] >= total || pages[i] < 0)
                {
                    pages.RemoveAt(i);
                    i--;
                }
            }

            if (report.PrintSettings.PrintPages == PrintPages.Odd)
            {
                int i = 0;
                while (i < pages.Count)
                {
                    if (pages[i] % 2 == 0)
                        i++;
                    else
                        pages.RemoveAt(i);
                }
            }
            else if (report.PrintSettings.PrintPages == PrintPages.Even)
            {
                int i = 0;
                while (i < pages.Count)
                {
                    if (pages[i] % 2 != 0)
                        i++;
                    else
                        pages.RemoveAt(i);
                }
            }

            // Remove pages with Printable property equal false.
            for (int i = 0; i < pages.Count; i++)
            {
                if (!report.PreparedPages.GetPage(pages[i]).Printable)
                {
                    pages.RemoveAt(i);
                }
            }

            if (report.PrintSettings.Reverse)
                pages.Reverse();
        }
    }
}