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iTechSharp/iTextSharp/text/pdf/PdfContentParser.cs
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iTechSharp/iTextSharp/text/pdf/PdfContentParser.cs
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using System;
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using System.Collections;
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using System.IO;
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/*
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* $Id: PdfContentParser.cs,v 1.4 2006/09/17 15:55:03 psoares33 Exp $
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*
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* Copyright 2005 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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* Parses the page or template content.
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* @author Paulo Soares (psoares@consiste.pt)
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*/
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public class PdfContentParser {
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/**
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* Commands have this type.
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*/
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public const int COMMAND_TYPE = 200;
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/**
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* Holds value of property tokeniser.
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*/
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private PRTokeniser tokeniser;
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/**
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* Creates a new instance of PdfContentParser
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* @param tokeniser the tokeniser with the content
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*/
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public PdfContentParser(PRTokeniser tokeniser) {
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this.tokeniser = tokeniser;
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}
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/**
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* Parses a single command from the content. Each command is output as an array of arguments
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* having the command itself as the last element. The returned array will be empty if the
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* end of content was reached.
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* @param ls an <CODE>ArrayList</CODE> to use. It will be cleared before using. If it's
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* <CODE>null</CODE> will create a new <CODE>ArrayList</CODE>
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* @return the same <CODE>ArrayList</CODE> given as argument or a new one
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* @throws IOException on error
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*/
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public ArrayList Parse(ArrayList ls) {
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if (ls == null)
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ls = new ArrayList();
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else
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ls.Clear();
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PdfObject ob = null;
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while ((ob = ReadPRObject()) != null) {
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ls.Add(ob);
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if (ob.Type == COMMAND_TYPE)
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break;
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}
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return ls;
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}
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/**
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* Gets the tokeniser.
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* @return the tokeniser.
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*/
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public PRTokeniser GetTokeniser() {
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return this.tokeniser;
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}
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/**
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* Sets the tokeniser.
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* @param tokeniser the tokeniser
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*/
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public PRTokeniser Tokeniser {
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set {
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tokeniser = value;
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}
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get {
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return tokeniser;
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}
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}
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/**
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* Reads a dictionary. The tokeniser must be positioned past the "<<" token.
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* @return the dictionary
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* @throws IOException on error
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*/
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public PdfDictionary ReadDictionary() {
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PdfDictionary dic = new PdfDictionary();
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while (true) {
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if (!NextValidToken())
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throw new IOException("Unexpected end of file.");
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if (tokeniser.TokenType == PRTokeniser.TK_END_DIC)
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break;
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if (tokeniser.TokenType != PRTokeniser.TK_NAME)
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throw new IOException("Dictionary key is not a name.");
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PdfName name = new PdfName(tokeniser.StringValue, false);
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PdfObject obj = ReadPRObject();
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int type = obj.Type;
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if (-type == PRTokeniser.TK_END_DIC)
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throw new IOException("Unexpected '>>'");
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if (-type == PRTokeniser.TK_END_ARRAY)
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throw new IOException("Unexpected ']'");
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dic.Put(name, obj);
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}
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return dic;
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}
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/**
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* Reads an array. The tokeniser must be positioned past the "[" token.
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* @return an array
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* @throws IOException on error
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*/
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public PdfArray ReadArray() {
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PdfArray array = new PdfArray();
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while (true) {
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PdfObject obj = ReadPRObject();
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int type = obj.Type;
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if (-type == PRTokeniser.TK_END_ARRAY)
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break;
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if (-type == PRTokeniser.TK_END_DIC)
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throw new IOException("Unexpected '>>'");
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array.Add(obj);
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}
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return array;
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}
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/**
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* Reads a pdf object.
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* @return the pdf object
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* @throws IOException on error
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*/
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public PdfObject ReadPRObject() {
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if (!NextValidToken())
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return null;
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int type = tokeniser.TokenType;
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switch (type) {
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case PRTokeniser.TK_START_DIC: {
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PdfDictionary dic = ReadDictionary();
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return dic;
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}
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case PRTokeniser.TK_START_ARRAY:
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return ReadArray();
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case PRTokeniser.TK_STRING:
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PdfString str = new PdfString(tokeniser.StringValue, null).SetHexWriting(tokeniser.IsHexString());
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return str;
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case PRTokeniser.TK_NAME:
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return new PdfName(tokeniser.StringValue, false);
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case PRTokeniser.TK_NUMBER:
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return new PdfNumber(tokeniser.StringValue);
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case PRTokeniser.TK_OTHER:
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return new PdfLiteral(COMMAND_TYPE, tokeniser.StringValue);
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default:
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return new PdfLiteral(-type, tokeniser.StringValue);
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}
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}
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/**
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* Reads the next token skipping over the comments.
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* @return <CODE>true</CODE> if a token was read, <CODE>false</CODE> if the end of content was reached
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* @throws IOException on error
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*/
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public bool NextValidToken() {
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while (tokeniser.NextToken()) {
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if (tokeniser.TokenType == PRTokeniser.TK_COMMENT)
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continue;
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return true;
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}
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return false;
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}
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}
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}
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