/ITextSharp.Silverlight/iTextSharp/text/pdf/PdfTextArray.cs

using System;

using System.Collections.Generic;



/*

 * This file is part of the iText project.

 * Copyright (c) 1998-2009 1T3XT BVBA

 * Authors: Bruno Lowagie, Paulo Soares, et al.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU Affero General Public License version 3

 * as published by the Free Software Foundation with the addition of the

 * following permission added to Section 15 as permitted in Section 7(a):

 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,

 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.

 *

 * This program 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 Affero General Public License for more details.

 * You should have received a copy of the GNU Affero General Public License

 * along with this program; if not, see http://www.gnu.org/licenses or write to

 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA, 02110-1301 USA, or download the license from the following URL:

 * http://itextpdf.com/terms-of-use/

 *

 * The interactive user interfaces in modified source and object code versions

 * of this program must display Appropriate Legal Notices, as required under

 * Section 5 of the GNU Affero General Public License.

 *

 * In accordance with Section 7(b) of the GNU Affero General Public License,

 * you must retain the producer line in every PDF that is created or manipulated

 * using iText.

 *

 * You can be released from the requirements of the license by purchasing

 * a commercial license. Buying such a license is mandatory as soon as you

 * develop commercial activities involving the iText software without

 * disclosing the source code of your own applications.

 * These activities include: offering paid services to customers as an ASP,

 * serving PDFs on the fly in a web application, shipping iText with a closed

 * source product.

 *

 * For more information, please contact iText Software Corp. at this

 * address: sales@itextpdf.com

 */



namespace iTextSharp.text.pdf {



    /**

    * <CODE>PdfTextArray</CODE> defines an array with displacements and <CODE>PdfString</CODE>-objects.

    * <P>

    * A <CODE>TextArray</CODE> is used with the operator <VAR>TJ</VAR> in <CODE>PdfText</CODE>.

    * The first object in this array has to be a <CODE>PdfString</CODE>;

    * see reference manual version 1.3 section 8.7.5, pages 346-347.

    *       OR

    * see reference manual version 1.6 section 5.3.2, pages 378-379.

    */



    public class PdfTextArray{

        List<Object> arrayList = new List<Object>();

        

        // To emit a more efficient array, we consolidate

        // repeated numbers or strings into single array entries.

        // "add( 50 ); Add( -50 );" will REMOVE the combined zero from the array.

        // the alternative (leaving a zero in there) was Just Weird.

        // --Mark Storer, May 12, 2008

        private String lastStr;

        private float lastNum = float.NaN;

        

        // constructors

        public PdfTextArray(String str) {

            Add(str);

        }

        

        public PdfTextArray() {

        }

        

        /**

        * Adds a <CODE>PdfNumber</CODE> to the <CODE>PdfArray</CODE>.

        *

        * @param  number   displacement of the string

        */

        public void Add(PdfNumber number) {

            Add((float)number.DoubleValue);

        }

        

        public void Add(float number) {

            if (number != 0) {

                if (!float.IsNaN(lastNum)) {

                    lastNum += number;

                    if (lastNum != 0) {

                        ReplaceLast(lastNum);

                    } else {

                        arrayList.RemoveAt(arrayList.Count - 1);

                    }

                } else {

                    lastNum = number;

                    arrayList.Add(lastNum);

                }

                lastStr = null;

            }

            // adding zero doesn't modify the TextArray at all

        }

        

        public void Add(String str) {

            if (str.Length > 0) {

                if (lastStr != null) {

                    lastStr = lastStr + str;

                    ReplaceLast(lastStr);

                } else {

                    lastStr = str;

                    arrayList.Add(lastStr);

                }

                lastNum = float.NaN;

            }

            // adding an empty string doesn't modify the TextArray at all

        }

        

        internal List<Object> ArrayList {

            get {

                return arrayList;

            }

        }

        

        private void ReplaceLast(Object obj) {

            // deliberately throw the IndexOutOfBoundsException if we screw up.

            arrayList[arrayList.Count - 1] = obj;

        }

    }

}