com.lowagie.text.pdf.SequenceList Maven / Gradle / Ivy
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/*
* Copyright 2004 by Paulo Soares.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text.pdf;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
/**
* This class expands a string into a list of numbers. The main use is to select a
* range of pages.
*
* The general syntax is:
* [!][o][odd][e][even]start-end
*
* You can have multiple ranges separated by commas ','. The '!' modifier removes the
* range from what is already selected. The range changes are incremental, that is,
* numbers are added or deleted as the range appears. The start or the end, but not both, can be omitted.
*/
public class SequenceList {
protected static final int COMMA = 1;
protected static final int MINUS = 2;
protected static final int NOT = 3;
protected static final int TEXT = 4;
protected static final int NUMBER = 5;
protected static final int END = 6;
protected static final char EOT = '\uffff';
private static final int FIRST = 0;
private static final int DIGIT = 1;
private static final int OTHER = 2;
private static final int DIGIT2 = 3;
private static final String NOT_OTHER = "-,!0123456789";
protected char text[];
protected int ptr;
protected int number;
protected String other;
protected int low;
protected int high;
protected boolean odd;
protected boolean even;
protected boolean inverse;
protected SequenceList(String range) {
ptr = 0;
text = range.toCharArray();
}
protected char nextChar() {
while (true) {
if (ptr >= text.length)
return EOT;
char c = text[ptr++];
if (c > ' ')
return c;
}
}
protected void putBack() {
--ptr;
if (ptr < 0)
ptr = 0;
}
protected int getType() {
StringBuffer buf = new StringBuffer();
int state = FIRST;
while (true) {
char c = nextChar();
if (c == EOT) {
if (state == DIGIT) {
number = Integer.parseInt(other = buf.toString());
return NUMBER;
}
else if (state == OTHER) {
other = buf.toString().toLowerCase();
return TEXT;
}
return END;
}
switch (state) {
case FIRST:
switch (c) {
case '!':
return NOT;
case '-':
return MINUS;
case ',':
return COMMA;
}
buf.append(c);
if (c >= '0' && c <= '9')
state = DIGIT;
else
state = OTHER;
break;
case DIGIT:
if (c >= '0' && c <= '9')
buf.append(c);
else {
putBack();
number = Integer.parseInt(other = buf.toString());
return NUMBER;
}
break;
case OTHER:
if (NOT_OTHER.indexOf(c) < 0)
buf.append(c);
else {
putBack();
other = buf.toString().toLowerCase();
return TEXT;
}
break;
}
}
}
private void otherProc() {
if (other.equals("odd") || other.equals("o")) {
odd = true;
even = false;
}
else if (other.equals("even") || other.equals("e")) {
odd = false;
even = true;
}
}
protected boolean getAttributes() {
low = -1;
high = -1;
odd = even = inverse = false;
int state = OTHER;
while (true) {
int type = getType();
if (type == END || type == COMMA) {
if (state == DIGIT)
high = low;
return (type == END);
}
switch (state) {
case OTHER:
switch (type) {
case NOT:
inverse = true;
break;
case MINUS:
state = DIGIT2;
break;
default:
if (type == NUMBER) {
low = number;
state = DIGIT;
}
else
otherProc();
break;
}
break;
case DIGIT:
switch (type) {
case NOT:
inverse = true;
state = OTHER;
high = low;
break;
case MINUS:
state = DIGIT2;
break;
default:
high = low;
state = OTHER;
otherProc();
break;
}
break;
case DIGIT2:
switch (type) {
case NOT:
inverse = true;
state = OTHER;
break;
case MINUS:
break;
case NUMBER:
high = number;
state = OTHER;
break;
default:
state = OTHER;
otherProc();
break;
}
break;
}
}
}
/**
* Generates a list of numbers from a string.
* @param ranges the comma separated ranges
* @param maxNumber the maximum number in the range
* @return a list with the numbers as Integer
*/
public static List expand(String ranges, int maxNumber) {
SequenceList parse = new SequenceList(ranges);
LinkedList list = new LinkedList();
boolean sair = false;
while (!sair) {
sair = parse.getAttributes();
if (parse.low == -1 && parse.high == -1 && !parse.even && !parse.odd)
continue;
if (parse.low < 1)
parse.low = 1;
if (parse.high < 1 || parse.high > maxNumber)
parse.high = maxNumber;
if (parse.low > maxNumber)
parse.low = maxNumber;
//System.out.println("low="+parse.low+",high="+parse.high+",odd="+parse.odd+",even="+parse.even+",inverse="+parse.inverse);
int inc = 1;
if (parse.inverse) {
if (parse.low > parse.high) {
int t = parse.low;
parse.low = parse.high;
parse.high = t;
}
for (ListIterator it = list.listIterator(); it.hasNext();) {
int n = ((Integer)it.next()).intValue();
if (parse.even && (n & 1) == 1)
continue;
if (parse.odd && (n & 1) == 0)
continue;
if (n >= parse.low && n <= parse.high)
it.remove();
}
}
else {
if (parse.low > parse.high) {
inc = -1;
if (parse.odd || parse.even) {
--inc;
if (parse.even)
parse.low &= ~1;
else
parse.low -= ((parse.low & 1) == 1 ? 0 : 1);
}
for (int k = parse.low; k >= parse.high; k += inc)
list.add(new Integer(k));
}
else {
if (parse.odd || parse.even) {
++inc;
if (parse.odd)
parse.low |= 1;
else
parse.low += ((parse.low & 1) == 1 ? 1 : 0);
}
for (int k = parse.low; k <= parse.high; k += inc) {
list.add(new Integer(k));
}
}
}
// for (int k = 0; k < list.size(); ++k)
// System.out.print(((Integer)list.get(k)).intValue() + ",");
// System.out.println();
}
return list;
}
}