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iTechSharp/iTextSharp/text/pdf/SequenceList.cs
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317
iTechSharp/iTextSharp/text/pdf/SequenceList.cs
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using System;
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using System.Collections;
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using System.Text;
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using System.util;
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/*
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* Copyright 2004 by Paulo Soares.
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* (the "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the License.
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*
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* The Original Code is 'iText, a free JAVA-PDF library'.
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*
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* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
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* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
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* All Rights Reserved.
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* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
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* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
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*
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* Contributor(s): all the names of the contributors are added in the source code
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* where applicable.
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*
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* Alternatively, the contents of this file may be used under the terms of the
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* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
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* provisions of LGPL are applicable instead of those above. If you wish to
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* allow use of your version of this file only under the terms of the LGPL
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* License and not to allow others to use your version of this file under
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* the MPL, indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by the LGPL.
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* If you do not delete the provisions above, a recipient may use your version
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* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the MPL as stated above or under the terms of the GNU
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* Library General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
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* details.
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*
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* If you didn't download this code from the following link, you should check if
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* you aren't using an obsolete version:
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* http://www.lowagie.com/iText/
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*/
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namespace iTextSharp.text.pdf {
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/**
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* This class expands a string into a list of numbers. The main use is to select a
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* range of pages.
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* <p>
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* The general systax is:<br>
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* [!][o][odd][e][even]start-end
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* <p>
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* You can have multiple ranges separated by commas ','. The '!' modifier removes the
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* range from what is already selected. The range changes are incremental, that is,
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* numbers are added or deleted as the range appears. The start or the end, but not both, can be ommited.
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*/
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public class SequenceList {
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protected const int COMMA = 1;
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protected const int MINUS = 2;
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protected const int NOT = 3;
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protected const int TEXT = 4;
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protected const int NUMBER = 5;
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protected const int END = 6;
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protected const char EOT = '\uffff';
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private const int FIRST = 0;
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private const int DIGIT = 1;
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private const int OTHER = 2;
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private const int DIGIT2 = 3;
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private const String NOT_OTHER = "-,!0123456789";
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protected char[] text;
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protected int ptr;
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protected int number;
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protected String other;
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protected int low;
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protected int high;
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protected bool odd;
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protected bool even;
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protected bool inverse;
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protected SequenceList(String range) {
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ptr = 0;
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text = range.ToCharArray();
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}
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protected char NextChar() {
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while (true) {
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if (ptr >= text.Length)
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return EOT;
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char c = text[ptr++];
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if (c > ' ')
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return c;
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}
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}
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protected void PutBack() {
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--ptr;
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if (ptr < 0)
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ptr = 0;
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}
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protected int Type {
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get {
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StringBuilder buf = new StringBuilder();
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int state = FIRST;
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while (true) {
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char c = NextChar();
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if (c == EOT) {
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if (state == DIGIT) {
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number = int.Parse(other = buf.ToString());
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return NUMBER;
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}
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else if (state == OTHER) {
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other = buf.ToString().ToLower(System.Globalization.CultureInfo.InvariantCulture);
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return TEXT;
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}
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return END;
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}
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switch (state) {
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case FIRST:
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switch (c) {
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case '!':
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return NOT;
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case '-':
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return MINUS;
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case ',':
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return COMMA;
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}
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buf.Append(c);
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if (c >= '0' && c <= '9')
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state = DIGIT;
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else
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state = OTHER;
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break;
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case DIGIT:
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if (c >= '0' && c <= '9')
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buf.Append(c);
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else {
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PutBack();
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number = int.Parse(other = buf.ToString());
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return NUMBER;
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}
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break;
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case OTHER:
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if (NOT_OTHER.IndexOf(c) < 0)
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buf.Append(c);
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else {
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PutBack();
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other = buf.ToString().ToLower(System.Globalization.CultureInfo.InvariantCulture);
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return TEXT;
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}
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break;
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}
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}
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}
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}
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private void OtherProc() {
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if (other.Equals("odd") || other.Equals("o")) {
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odd = true;
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even = false;
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}
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else if (other.Equals("even") || other.Equals("e")) {
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odd = false;
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even = true;
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}
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}
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protected bool GetAttributes() {
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low = -1;
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high = -1;
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odd = even = inverse = false;
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int state = OTHER;
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while (true) {
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int type = Type;
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if (type == END || type == COMMA) {
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if (state == DIGIT)
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high = low;
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return (type == END);
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}
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switch (state) {
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case OTHER:
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switch (type) {
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case NOT:
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inverse = true;
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break;
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case MINUS:
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state = DIGIT2;
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break;
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default:
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if (type == NUMBER) {
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low = number;
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state = DIGIT;
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}
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else
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OtherProc();
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break;
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}
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break;
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case DIGIT:
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switch (type) {
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case NOT:
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inverse = true;
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state = OTHER;
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high = low;
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break;
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case MINUS:
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state = DIGIT2;
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break;
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default:
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high = low;
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state = OTHER;
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OtherProc();
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break;
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}
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break;
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case DIGIT2:
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switch (type) {
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case NOT:
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inverse = true;
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state = OTHER;
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break;
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case MINUS:
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break;
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case NUMBER:
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high = number;
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state = OTHER;
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break;
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default:
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state = OTHER;
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OtherProc();
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break;
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}
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break;
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}
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}
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}
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/**
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* Generates a list of numbers from a string.
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* @param ranges the comma separated ranges
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* @param maxNumber the maximum number in the range
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* @return a list with the numbers as <CODE>Integer</CODE>
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*/
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public static ArrayList Expand(String ranges, int maxNumber) {
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SequenceList parse = new SequenceList(ranges);
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ArrayList list = new ArrayList();
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bool sair = false;
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while (!sair) {
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sair = parse.GetAttributes();
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if (parse.low == -1 && parse.high == -1 && !parse.even && !parse.odd)
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continue;
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if (parse.low < 1)
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parse.low = 1;
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if (parse.high < 1 || parse.high > maxNumber)
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parse.high = maxNumber;
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if (parse.low > maxNumber)
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parse.low = maxNumber;
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//System.out.Println("low="+parse.low+",high="+parse.high+",odd="+parse.odd+",even="+parse.even+",inverse="+parse.inverse);
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int inc = 1;
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if (parse.inverse) {
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if (parse.low > parse.high) {
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int t = parse.low;
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parse.low = parse.high;
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parse.high = t;
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}
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for (ListIterator it = new ListIterator(list); it.HasNext();) {
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int n = (int)it.Next();
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if (parse.even && (n & 1) == 1)
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continue;
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if (parse.odd && (n & 1) == 0)
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continue;
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if (n >= parse.low && n <= parse.high)
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it.Remove();
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}
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}
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else {
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if (parse.low > parse.high) {
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inc = -1;
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if (parse.odd || parse.even) {
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--inc;
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if (parse.even)
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parse.low &= ~1;
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else
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parse.low -= ((parse.low & 1) == 1 ? 0 : 1);
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}
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for (int k = parse.low; k >= parse.high; k += inc) {
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list.Add(k);
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}
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}
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else {
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if (parse.odd || parse.even) {
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++inc;
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if (parse.odd)
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parse.low |= 1;
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else
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parse.low += ((parse.low & 1) == 1 ? 1 : 0);
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}
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for (int k = parse.low; k <= parse.high; k += inc)
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list.Add(k);
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}
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}
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}
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return list;
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}
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}
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}
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