xmldtdscannerimpl.java

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/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999-2004 The Apache Software Foundation.  
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package com.sun.org.apache.xerces.internal.impl;

import java.io.IOException;

import com.sun.org.apache.xerces.internal.impl.msg.XMLMessageFormatter;
import com.sun.org.apache.xerces.internal.util.SymbolTable;
import com.sun.org.apache.xerces.internal.util.XMLAttributesImpl;
import com.sun.org.apache.xerces.internal.util.XMLChar;
import com.sun.org.apache.xerces.internal.util.XMLStringBuffer;
import com.sun.org.apache.xerces.internal.xni.Augmentations;
import com.sun.org.apache.xerces.internal.xni.XMLDTDContentModelHandler;
import com.sun.org.apache.xerces.internal.xni.XMLDTDHandler;
import com.sun.org.apache.xerces.internal.xni.XMLResourceIdentifier;
import com.sun.org.apache.xerces.internal.xni.XMLString;
import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xni.parser.XMLComponent;
import com.sun.org.apache.xerces.internal.xni.parser.XMLComponentManager;
import com.sun.org.apache.xerces.internal.xni.parser.XMLConfigurationException;
import com.sun.org.apache.xerces.internal.xni.parser.XMLDTDScanner;
import com.sun.org.apache.xerces.internal.xni.parser.XMLInputSource;

/**
 * This class is responsible for scanning the declarations found
 * in the internal and external subsets of a DTD in an XML document.
 * The scanner acts as the sources for the DTD information which is 
 * communicated to the DTD handlers.
 * <p>
 * This component requires the following features and properties from the
 * component manager that uses it:
 * <ul>
 *  <li>http://xml.org/sax/features/validation</li>
 *  <li>http://apache.org/xml/features/scanner/notify-char-refs</li>
 *  <li>http://apache.org/xml/properties/internal/symbol-table</li>
 *  <li>http://apache.org/xml/properties/internal/error-reporter</li>
 *  <li>http://apache.org/xml/properties/internal/entity-manager</li>
 * </ul>
 *
 * @author Arnaud  Le Hors, IBM
 * @author Andy Clark, IBM
 * @author Glenn Marcy, IBM
 * @author Eric Ye, IBM
 *
 * @version $Id: XMLDTDScannerImpl.java,v 1.49 2004/02/27 20:36:07 mrglavas Exp $
 */
public class XMLDTDScannerImpl
    extends XMLScanner
    implements XMLDTDScanner, XMLComponent, XMLEntityHandler {

    //
    // Constants
    //

    // scanner states

    /** Scanner state: end of input. */
    protected static final int SCANNER_STATE_END_OF_INPUT = 0;

    /** Scanner state: text declaration. */
    protected static final int SCANNER_STATE_TEXT_DECL = 1;

    /** Scanner state: markup declaration. */
    protected static final int SCANNER_STATE_MARKUP_DECL = 2;

    // recognized features and properties
    
    /** Recognized features. */
    private static final String[] RECOGNIZED_FEATURES = {
        VALIDATION,
        NOTIFY_CHAR_REFS,
    };

    /** Feature defaults. */
    private static final Boolean[] FEATURE_DEFAULTS = {
        null,
        Boolean.FALSE,
    };

    /** Recognized properties. */
    private static final String[] RECOGNIZED_PROPERTIES = {
        SYMBOL_TABLE,
        ERROR_REPORTER,
        ENTITY_MANAGER,
    };

    /** Property defaults. */
    private static final Object[] PROPERTY_DEFAULTS = {
        null,
        null,
        null,
    };

    // debugging

    /** Debug scanner state. */
    private static final boolean DEBUG_SCANNER_STATE = false;

    //
    // Data
    //

    // handlers

    /** DTD handler. */
    protected XMLDTDHandler fDTDHandler;

    /** DTD content model handler. */
    protected XMLDTDContentModelHandler fDTDContentModelHandler;

    // state

    /** Scanner state. */
    protected int fScannerState;

    /** Standalone. */
    protected boolean fStandalone;

    /** Seen external DTD. */
    protected boolean fSeenExternalDTD;

    /** Seen external parameter entity. */
    protected boolean fSeenExternalPE;

    // private data

    /** Start DTD called. */
    private boolean fStartDTDCalled;

    /** Default attribute */
    private XMLAttributesImpl fAttributes = new XMLAttributesImpl();

    /** 
     * Stack of content operators (either '|' or ',') in children 
     * content.
     */
    private int[] fContentStack = new int[5];

    /** Size of content stack. */
    private int fContentDepth;

    /** Parameter entity stack to check well-formedness. */
    private int[] fPEStack = new int[5];


    /** Parameter entity stack to report start/end entity calls. */
    private boolean[] fPEReport = new boolean[5];

    /** Number of opened parameter entities. */
    private int fPEDepth;

    /** Markup depth. */
    private int fMarkUpDepth;

    /** Number of opened external entities. */
    private int fExtEntityDepth;

    /** Number of opened include sections. */
    private int fIncludeSectDepth;

    // temporary variables

    /** Array of 3 strings. */
    private String[] fStrings = new String[3];

    /** String. */
    private XMLString fString = new XMLString();

    /** String buffer. */
    private XMLStringBuffer fStringBuffer = new XMLStringBuffer();

    /** String buffer. */
    private XMLStringBuffer fStringBuffer2 = new XMLStringBuffer();

    /** Literal text. */
    private XMLString fLiteral = new XMLString();

    /** Literal text. */
    private XMLString fLiteral2 = new XMLString();

    /** Enumeration values. */
    private String[] fEnumeration = new String[5];

    /** Enumeration values count. */
    private int fEnumerationCount;

    /** Ignore conditional section buffer. */
    private XMLStringBuffer fIgnoreConditionalBuffer = new XMLStringBuffer(128);

    //
    // Constructors
    //

    /** Default constructor. */
    public XMLDTDScannerImpl() {} // <init>()

    /** Constructor for he use of non-XMLComponentManagers. */
    public XMLDTDScannerImpl(SymbolTable symbolTable,
                XMLErrorReporter errorReporter, XMLEntityManager entityManager) {
        fSymbolTable = symbolTable;
        fErrorReporter = errorReporter;
        fEntityManager = entityManager;
        entityManager.setProperty(SYMBOL_TABLE, fSymbolTable);
    }

    //
    // XMLDTDScanner methods
    //

    /** 
     * Sets the input source. 
     *
     * @param inputSource The input source or null.
     *
     * @throws IOException Thrown on i/o error.
     */
    public void setInputSource(XMLInputSource inputSource) throws IOException {
        if (inputSource == null) {
            // no system id was available
            if (fDTDHandler != null) {
                fDTDHandler.startDTD(null, null);
                fDTDHandler.endDTD(null);
            }
            return;
        }
        fEntityManager.setEntityHandler(this);
        fEntityManager.startDTDEntity(inputSource);
    } // setInputSource(XMLInputSource)

    /**
     * Scans the external subset of the document.
     *
     * @param complete True if the scanner should scan the document
     *                 completely, pushing all events to the registered
     *                 document handler. A value of false indicates that
     *                 that the scanner should only scan the next portion
     *                 of the document and return. A scanner instance is
     *                 permitted to completely scan a document if it does
     *                 not support this "pull" scanning model.
     *
     * @return True if there is more to scan, false otherwise.
     */
    public boolean scanDTDExternalSubset(boolean complete) 
        throws IOException, XNIException {

        fEntityManager.setEntityHandler(this);
        if (fScannerState == SCANNER_STATE_TEXT_DECL) {
            fSeenExternalDTD = true;
            boolean textDecl = scanTextDecl();
            if (fScannerState == SCANNER_STATE_END_OF_INPUT) {
                return false;
            }
            else {
                // next state is markup decls regardless of whether there
                // is a TextDecl or not
                setScannerState(SCANNER_STATE_MARKUP_DECL);
                if (textDecl && !complete) {
                    return true;
                }
            }
        }
        // keep dispatching "events"
        do {
            if (!scanDecls(complete)) {
                return false;
            }
        } while (complete);

        // return that there is more to scan
        return true;

    } // scanDTDExternalSubset(boolean):boolean

    /** 
     * Scans the internal subset of the document.
     *
     * @param complete True if the scanner should scan the document
     *                 completely, pushing all events to the registered
     *                 document handler. A value of false indicates that
     *                 that the scanner should only scan the next portion
     *                 of the document and return. A scanner instance is
     *                 permitted to completely scan a document if it does
     *                 not support this "pull" scanning model.
     * @param standalone True if the document was specified as standalone.
     *                   This value is important for verifying certain
     *                   well-formedness constraints.
     * @param hasExternalDTD True if the document has an external DTD.
     *                       This allows the scanner to properly notify
     *                       the handler of the end of the DTD in the
     *                       absence of an external subset.
     *
     * @return True if there is more to scan, false otherwise.
     */
    public boolean scanDTDInternalSubset(boolean complete, boolean standalone,
                                         boolean hasExternalSubset)
        throws IOException, XNIException {
        // reset entity scanner
        fEntityScanner = fEntityManager.getEntityScanner();